Mirza Jahanzaib - Academia.edu (original) (raw)
Papers by Mirza Jahanzaib
Advances in Production Engineering & Management, 2016
Cutting tool life, its wear rate and machining cost play significant role in a machining process.... more Cutting tool life, its wear rate and machining cost play significant role in a machining process. Effect of these parameters using face milling of titanium alloy is analysed to assess the economic factor of sustainability. Machining sustainability of Ti-6Al-4V hardened to 55 HRC is assessed through a novel technique of iso-response method, in which the response value, i.e. surface finish is taken as criteria for evaluation and comparison among dry, conventional and cryogenic machining. Experiments are designed in DOE for central composite design and performed face milling of Ti-6Al-4V with PVD coated carbide inserts using three conditions of cooling and measured the response values. Feed, speed, and depth of cut were used as input variables. Comparing the average results of tool life and machining cost for iso-response technique, it was found that 47.55 % less electricity cost and 47.59 % less machine operating cost and 10.76 times increased cutting tool life achieved for cryogenically cooled experiments as compared with dry machining. Coolant cost was found 13.33 times cheaper for cryogenic as compared with conventional machining. The results indicate that cryogenic cooling is more sustainable for tool life, having better surface finish of machined part with least energy and machining cost.
Advances in Production Engineering & Management, 2015
Globalization has demanded innovative manufacturing and continuous improvement in order to stay c... more Globalization has demanded innovative manufacturing and continuous improvement in order to stay competitive. This need has compelled the manufacturing world to devise strategies for producing cost-efficient parts without compromising quality. The Toyota Production System was at the beginning of such initiatives. It was successful in addressing cost through elimination of non-value-added time and quality by monitoring and controlling the productions of defective parts. Lean thinking originated from the Toyota Production System and inherited its concepts and methodology. In contrast to the Toyota Production System, the implementation of lean has been proposed in almost every domain of life. In the manufacturing domain it is a common misconception that lean is suitable for mass production only. This research has been built upon the belief that lean is for everything and has challenged this stereotype by implementing it within a job shop environment. A manufacturing industry was selected that was rebuilding battlefield tanks. The existing system was suffering delays and missing delivery targets due to uncertain and costly production. The proposed and existing systems were modeled and simulated using Arena 10.0 software. This work was successful in reducing the manufacturing-led time, work in process inventory and average cycle times with a reduction in cost and space utilization. Cost benefit analysis was performed showing that the proposed system would be beneficial after 1500 parts. We are further expanding our proposed approach towards the tool manufacturing shop in order to study the impact of lean and its suitability for scheduling in job shops.
The International Journal of Advanced Manufacturing Technology, 2021
The requirement of cost-effective and ecological production systems is crucial in the competitive... more The requirement of cost-effective and ecological production systems is crucial in the competitive market. In this regard, the focus is shifted towards sustainable and cleaner machining processes. Besides the clean technologies, effective parametric control is required for machining materials (such as High Strength Low Alloy Steels) specifically designed for high strength applications having superior physio-chemical properties. Therefore, the machinability complexities require optimized solutions to reduce temperature elevation and tooling costs and improve machining of these materials. Complying to the market needs, this research examines the effectiveness of nanofluid on tool life, wear mechanisms, surface roughness (Ra), surface morphology, and material removal rate (MRR) in turning of 30CrMnSiA (HSLA) using minimum quantity lubrication (MQL) and SiO2-H2O nanofluids (NF-MQL). A systematic investigation based on physical phenomena involved is carried out considering four process pa...
Mehran University Research Journal of Engineering and Technology, 2017
Engineering, Technology & Applied Science Research, 2015
The purpose of the present work is to study the chaotic behavior in a flexible assembly line of a... more The purpose of the present work is to study the chaotic behavior in a flexible assembly line of a manufacturing system. A flexible assembly line can accommodate a variety of product types. Result analysis is performed to obtain time persistent data. The behavior of the system is observed for Work-In-Process, as assembling systems are sensitive during processing. It is found that the average Lyapunov exponent is positive in the considered case, and thus chaotic behavior may be present in flexible assembly lines.
The aim of this research is to study the machinability aspects of hardened AISI 4340 High Strengt... more The aim of this research is to study the machinability aspects of hardened AISI 4340 High Strength Low Alloy (HSLA) steel (50 ± 2 HRC (Hardness Rockwell C)). The experimental investigation using coated carbide inserts is carried out during the dry hard milling process in a sustainable environment. The input parameters in the study are speed, feed rate and depth of cut and the responses are Average surface Roughness (Ra) and Material Removal Rate (MRR) that are selected through screening. Central Composite Design (CCD) in response surface methodology has been utilized as the experimental design technique with twenty experiments. Analysis of variance has been employed to examine the momentous machining parameters and responses. A mathematical model has been developed to optimize the surface roughness and material removal rate. It has been observed that the most significant factor for Ra is feed rate while for MRR depth of cut is the most significant factor. The results show that the m...
Maintenance support system is formed by all the needed support resources which are related and co... more Maintenance support system is formed by all the needed support resources which are related and coordinated between each other to achieve certain objectives such as operational availability of the supported object during its life cycle. This paper describes the decision support system using simulation in the dynamic environment of vehicles repair and maintenance. The study illustrates a case relevant to repair and maintenance decision support system, in which different feasible scenarios has been modeled and modules developed for the analysis and improvement of the existing system. This is done by process mapping of the existing systems and modeling of the existing system in simulation language. Various feasible alternatives illuminated a pathway to significant improvements in customer service, management of work in process, resource utilization, over time and cycle time. It has been learnt that WIP and overtime are the major impediments in the system affecting the performance of the...
Since the industrial revolutions, accidents have become more common and frequent in all the indus... more Since the industrial revolutions, accidents have become more common and frequent in all the industries. To find out the causes of these accidents, plenty of techniques have been used until now. A review of the existing techniques of accident causation has been done in this study which highlights the strengths and weaknesses of all these techniques that have been used to find out the contributory factors of these incidents. In addition, the industries where these techniques have been used, have been identified and it is emphasized that these techniques should be applied in the textile industry in Pakistan which is the most accident prone industry in recent times. This study also leads to the realization that there is a need for newer techniques such as structural equation modelling that address the complex nature of accidents and deal with the interactions of contributory factors of accidents in large scale industries. It is also emphasized that the government should take the initiat...
Energy needs are increasing all over the world. The current sources of energy are decreasing rapi... more Energy needs are increasing all over the world. The current sources of energy are decreasing rapidly and their usage is causing environmental pollution including air and water pollution. Due to this reason, the need of the hour is to switch towards renewable and sustainable energy sources. The selection of a suitable renewable energy source is the most important task to meet the country’s energy need, especially in a scenario where these alternatives negatively affect the surrounding environment. Involvement of multiple benchmarks such as technical, environmental, economic, land occupy, and sustainability are making energy planning more complex for decision makers. Wind, biomass, hydrothermal, geothermal and solar are the alternative renewable energy sources in Pakistan. In such circumstances, companies need tools and techniques to find out the best solution in the contest of conflicting objectives, multiple alternatives and different criteria. Multi-Criteria Decision Making (MCDM) ...
Maintenance support system is formed by all the needed support resources which are related and co... more Maintenance support system is formed by all the needed support resources which are related and coordinated between each other to achieve certain objectives such as operational availability of the supported object during its life cycle. This paper describes the decision support system using simulation in the dynamic environment of vehicles repair and maintenance. The study illustrates a case relevant to repair and maintenance decision support system, in which different feasible scenarios has been modeled and modules developed for the analysis and improvement of the existing system. This is done by process mapping of the existing systems and modeling of the existing system in simulation language. Various feasible alternatives illuminated a pathway to significant improvements in customer service, management of work in process, resource utilization, over time and cycle time. It has been learnt that WIP and overtime are the major impediments in the system affecting the performance of the...
Journal of Engineering and Applied Sciences , University of Engineering and Technology, Peshawar, 2014
While selecting a global facility location, the decision makers normally have to face two types o... more While selecting a global facility location, the decision makers normally have to face two types of scenarios: exploring and prioritizing the factors affecting the location decision and selecting an appropriate optimization methodology, compatible to the said problem. This paper addresses a real world case study of the problem of selecting a country best suitable for a new cement plant installation among the list of four alternatives. The irreversible nature of the crucial decision requires analysis of wide range of factors with different optimization techniques. Therefore such factors were explored and prioritized from available literature and by recommendations of panel of experts followed by mathematical modelling of the said problem in four standard methodologies including the one presented in another paper earlier. The solutions were obtained by coding routines in the concerned programs. Stability analysis with respect to change of priorities and change of cost and capacity con...
International Journal of Precision Engineering and Manufacturing, 2021
The execution of sustainable manufacturing methods to make machining processes more eco-friendly ... more The execution of sustainable manufacturing methods to make machining processes more eco-friendly is a difficult task that has attracted significant attention from the industrial area for a long time. As one of the leading manufacturing processes, machining can have a profound impact on the environment, society, and financial aspects. In a specific scenario, recognizing reasonable machining conditions to supply cutting fluids utilizing eco-friendly methods is at present a significant focal point of academic and industrial sector research. This study is to investigate the optimal operational parameters such as speed, feed rate, and cutting depth during high-speed machining of 15CDV6 HSLA steel under near-dry (green machining) and flood lubrication using response surface methodology and an artificial neural network that leads to better performance measures like tool-chip interface temperature, specific energy, yield strength, and percentage elongation. Initially, tensile samples were prepared on wire EDM, further high-speed machining has been carried out on CNC milling using a mechanical carbide cutter to improve performance. The results showed that an improvement in tool-chip interface temperature (0.9–12%), specific energy (0.8–12%), yield strength (1.8–3.2%), and percentage elongation (1.0–8.9%) using green machining has been witnessed and confirmed that green machining is an alternative of the flood to enhance the strength while reducing the specific energy in addition to eco-friendly. Moreover, the comparative analysis between RSM and ANN results determined that the ANN delivers more precise results and confirms its adequacy when its correlation coefficients are large, and root mean square errors are small compared to those obtained through the RSM.
Thermal Science, 2020
Solar parabolic trough collector systems provide an attractive solution especially for solar ther... more Solar parabolic trough collector systems provide an attractive solution especially for solar thermal power generation. The performance of these systems significantly depends on receiver geometries. Therefore, in the current study, an experimental analysis has been performed using three different receiver geometries along-with two reflective materials. These receiver geometries include: simple tube (reference geometry A), receiver tube with straight absorber plate (geometry B), and receiver tube with curved absorber plate (geometry C), whereas, the reflective materials include: aluminum and stainless steel. The experimentation was performed under subtropical climate conditions of Taxila, Pakistan. From experimentation, it was identified that peak heat gain obtained from receiver geometries C and B were 71%, and 30% higher as compared to the reference geometry A, respectively. The, thermal efficiency of the system with geometry A was 20%, geometry B was 28%, and geometry C was 34%. Fu...
Science of The Total Environment, 2020
Multiple factors including technical, social, economic, regulatory, governmental, and environment... more Multiple factors including technical, social, economic, regulatory, governmental, and environmental add complexity in the process of selecting a suitable wastewater treatment technology. To overcome this issue, this paper aims to propose a decision support system (DSS) for the selection of wastewater treatment technologies. The proposed system has been developed using a detailed review of the state-of-the-art in wastewater treatment, implemented using Microsoft Visual Studio 2010 and validated through real-time case studies. The system is categorized into four treatment levels based on wastewater complexity and the required degree of treatment. These include preliminary, primary, secondary, and tertiary treatment. Based on the identified treatment levels, the proposed system suggests using any physical, biological, chemical, or hybrid treatment process. The developed DSS will aid the selection of suitable wastewater treatment technology from a set of alternatives while keeping user constraints, conflicting requirements, and prevailing conditions under consideration. Moreover, the system is capable to customize the treatment assembly at the planning stage with minimized costs, eliminate mistakes at the planning and design stage, facilitate decision making by narrowing down the alternative solution as per user requirements and prevailing conditions, incorporate customer demand, and promote sustainable development.
NED University Journal of Research, 2020
The sustainability of manufacturing systems is not thoroughly investigated in the existing litera... more The sustainability of manufacturing systems is not thoroughly investigated in the existing literature despite that fact that it affects service-oriented organisations. This paper addresses this gap by incorporating the criterion of energy consumption in mixed model assembly line sequencing (MMALS) to explore the potential for energy saving. Energy consumption was integrated with makespan and sequence dependent setup time of mixed models to achieve the sustainability in sequencing. A mathematical model was developed for the optimisation of energy efficient MMAL (EEMMAL). The multi-objective intelligent genetic algorithm (MOIGA) was proposed for minimisation of three conflicting objectives. A case study was conducted using centrifugal pump assembly line to test the performance of proposed MOIGA and the results were compared with those obtained from multi-objective genetic algorithm (MOGA). Finally, a trade-off analysis was conducted between total setup time, makespan (a service level ...
Journal of Basic & Applied Sciences, 2018
Industrial revolutions not only improved the general lifestyle of individuals but also brought an... more Industrial revolutions not only improved the general lifestyle of individuals but also brought an increase in the diversity of the manufactured goods. This diversification involved use of advanced technology and complex methods that entailed dangerous conditions. According to international labor organization, occupational accidents cause death of more than two million individuals each year in different industries. Process industries are complex in nature and tend to lead to more accidents. In Pakistan among the process industries, textile mills are the most accident prone industries in recent times. Therefore, an empirical analysis of a textile process industry has been done using structural equation modelling to examine the interactions between the contributory factors of accidents. Results revealed that unsafe acts are a major contributor to human error, equipment error and unsafe environment that in turn lead to the calamities and disasters that can be avoided with proper safety ...
International Journal of Quality and Innovation, 2017
This research aims to address the applications of variants of ant colony optimisation (ACO) appro... more This research aims to address the applications of variants of ant colony optimisation (ACO) approach to solve no-wait flow shop scheduling problem (NW-FSSP). The most suitable ACO algorithm out of basic algorithms has been selected and modified to achieve more purified results. The algorithm was coded in visual basic. The varied algorithm has been applied to the bench mark problems and results were compared with the results achieved previously by other researchers using different meta-heuristics. The research covers detailed steps carried out for application of basic ACO algorithms on bench mark problems, comparison of results achieved by application of basic ACO algorithms, selection of best out of basic algorithms, modification of selected basic algorithm and generation of varied ACO algorithm. The varied ACO algorithm gave reasonably good results for almost all the problems under consideration and was able to handle fairly large sized problems with far less computational time. Comparative analysis depicted that the proposed ACO algorithm performed better than genetic algorithm on large sized problems and better than Rajendran heuristic in almost all problems under considerations.
International Journal of Quality and Innovation, 2017
This paper presents a genetic algorithm for a job shop scheduling problem with parallel machines.... more This paper presents a genetic algorithm for a job shop scheduling problem with parallel machines. The objective is to minimise the makespan. After solving an example, the performance of the proposed algorithm was examined on a set of test problems. The computational test was performed with moderate benchmark instances given in the literature. Now, many industrial work centres are shifting their focus towards implementation of job shop scheduling model. Large throughput and just-in-time restrictions have augmented the requirement of additional parallel machines at various production stages. This generates the scope for research on optimising job shop problem with parallel machines. However, research on this topic is very limited as compared to other job shop problems. A genetic algorithm has been proposed in this research work which effectively finds the near optimal makespan schedules for the job shop problem with parallel machines. The algorithm was implemented on the modified benchmarks from the literature and the results were compared with heuristics methods available in literature for solving this problem. It is shown that the proposed GA performs reasonably well when compared to the other techniques under consideration.
NED University Journal of Research, 2019
Resource constrained project scheduling problem has significant application in industries. Althou... more Resource constrained project scheduling problem has significant application in industries. Although several heuristic solutions have been developed in the literature to address this problem, most of these have lesser focus on scheduling of shared and scarce resources. The presented study proposes a resource optimisation based heuristic (ROBH) to optimise the utilisation of shared resources so as to minimise the penalty cost of projects. The proposed ROBH identifies shared resources within the project activities and shifts the activities from the bottleneck resource to the residual resources. The performance of the proposed ROBH was tested using the standard benchmark instances of project scheduling problems available in the existing literature. The results were compared with those obtained from the heuristics available in the project scheduling problem library. This comparison indicated that the results provided by ROBH are significant as compared to the results obtained from the he...
International Journal of Engineering & Technology, 2018
A novel internal combustion engine termed as Crank Rocker Engine has been developed at Universiti... more A novel internal combustion engine termed as Crank Rocker Engine has been developed at Universiti Teknologi PETRONAS (UTP) Malaysia. In the existing design, the engine cylinder is cooled through forced convection which is not efficient and malfunctioning of cooling system could lead to engine overheating. The objective of the current study is to develop a concept of an integrated and customized cooling system for the Crank-Rocker engine and to develop through rapid prototyping (RP). The proposed cooling system comprises of an integrated cooling water jacket around the engine cylinder, which works on the principle of forced convection. The forced convection is energy intensive and not suitable for stationary engines. Therefore, an enhanced design of the cooling system is required to improve the overall performance of the engine. Since the engine cylinder is curved, the conventional manufacturing technologies could be difficult to apply for the development of cooling system. For swift...
Advances in Production Engineering & Management, 2016
Cutting tool life, its wear rate and machining cost play significant role in a machining process.... more Cutting tool life, its wear rate and machining cost play significant role in a machining process. Effect of these parameters using face milling of titanium alloy is analysed to assess the economic factor of sustainability. Machining sustainability of Ti-6Al-4V hardened to 55 HRC is assessed through a novel technique of iso-response method, in which the response value, i.e. surface finish is taken as criteria for evaluation and comparison among dry, conventional and cryogenic machining. Experiments are designed in DOE for central composite design and performed face milling of Ti-6Al-4V with PVD coated carbide inserts using three conditions of cooling and measured the response values. Feed, speed, and depth of cut were used as input variables. Comparing the average results of tool life and machining cost for iso-response technique, it was found that 47.55 % less electricity cost and 47.59 % less machine operating cost and 10.76 times increased cutting tool life achieved for cryogenically cooled experiments as compared with dry machining. Coolant cost was found 13.33 times cheaper for cryogenic as compared with conventional machining. The results indicate that cryogenic cooling is more sustainable for tool life, having better surface finish of machined part with least energy and machining cost.
Advances in Production Engineering & Management, 2015
Globalization has demanded innovative manufacturing and continuous improvement in order to stay c... more Globalization has demanded innovative manufacturing and continuous improvement in order to stay competitive. This need has compelled the manufacturing world to devise strategies for producing cost-efficient parts without compromising quality. The Toyota Production System was at the beginning of such initiatives. It was successful in addressing cost through elimination of non-value-added time and quality by monitoring and controlling the productions of defective parts. Lean thinking originated from the Toyota Production System and inherited its concepts and methodology. In contrast to the Toyota Production System, the implementation of lean has been proposed in almost every domain of life. In the manufacturing domain it is a common misconception that lean is suitable for mass production only. This research has been built upon the belief that lean is for everything and has challenged this stereotype by implementing it within a job shop environment. A manufacturing industry was selected that was rebuilding battlefield tanks. The existing system was suffering delays and missing delivery targets due to uncertain and costly production. The proposed and existing systems were modeled and simulated using Arena 10.0 software. This work was successful in reducing the manufacturing-led time, work in process inventory and average cycle times with a reduction in cost and space utilization. Cost benefit analysis was performed showing that the proposed system would be beneficial after 1500 parts. We are further expanding our proposed approach towards the tool manufacturing shop in order to study the impact of lean and its suitability for scheduling in job shops.
The International Journal of Advanced Manufacturing Technology, 2021
The requirement of cost-effective and ecological production systems is crucial in the competitive... more The requirement of cost-effective and ecological production systems is crucial in the competitive market. In this regard, the focus is shifted towards sustainable and cleaner machining processes. Besides the clean technologies, effective parametric control is required for machining materials (such as High Strength Low Alloy Steels) specifically designed for high strength applications having superior physio-chemical properties. Therefore, the machinability complexities require optimized solutions to reduce temperature elevation and tooling costs and improve machining of these materials. Complying to the market needs, this research examines the effectiveness of nanofluid on tool life, wear mechanisms, surface roughness (Ra), surface morphology, and material removal rate (MRR) in turning of 30CrMnSiA (HSLA) using minimum quantity lubrication (MQL) and SiO2-H2O nanofluids (NF-MQL). A systematic investigation based on physical phenomena involved is carried out considering four process pa...
Mehran University Research Journal of Engineering and Technology, 2017
Engineering, Technology & Applied Science Research, 2015
The purpose of the present work is to study the chaotic behavior in a flexible assembly line of a... more The purpose of the present work is to study the chaotic behavior in a flexible assembly line of a manufacturing system. A flexible assembly line can accommodate a variety of product types. Result analysis is performed to obtain time persistent data. The behavior of the system is observed for Work-In-Process, as assembling systems are sensitive during processing. It is found that the average Lyapunov exponent is positive in the considered case, and thus chaotic behavior may be present in flexible assembly lines.
The aim of this research is to study the machinability aspects of hardened AISI 4340 High Strengt... more The aim of this research is to study the machinability aspects of hardened AISI 4340 High Strength Low Alloy (HSLA) steel (50 ± 2 HRC (Hardness Rockwell C)). The experimental investigation using coated carbide inserts is carried out during the dry hard milling process in a sustainable environment. The input parameters in the study are speed, feed rate and depth of cut and the responses are Average surface Roughness (Ra) and Material Removal Rate (MRR) that are selected through screening. Central Composite Design (CCD) in response surface methodology has been utilized as the experimental design technique with twenty experiments. Analysis of variance has been employed to examine the momentous machining parameters and responses. A mathematical model has been developed to optimize the surface roughness and material removal rate. It has been observed that the most significant factor for Ra is feed rate while for MRR depth of cut is the most significant factor. The results show that the m...
Maintenance support system is formed by all the needed support resources which are related and co... more Maintenance support system is formed by all the needed support resources which are related and coordinated between each other to achieve certain objectives such as operational availability of the supported object during its life cycle. This paper describes the decision support system using simulation in the dynamic environment of vehicles repair and maintenance. The study illustrates a case relevant to repair and maintenance decision support system, in which different feasible scenarios has been modeled and modules developed for the analysis and improvement of the existing system. This is done by process mapping of the existing systems and modeling of the existing system in simulation language. Various feasible alternatives illuminated a pathway to significant improvements in customer service, management of work in process, resource utilization, over time and cycle time. It has been learnt that WIP and overtime are the major impediments in the system affecting the performance of the...
Since the industrial revolutions, accidents have become more common and frequent in all the indus... more Since the industrial revolutions, accidents have become more common and frequent in all the industries. To find out the causes of these accidents, plenty of techniques have been used until now. A review of the existing techniques of accident causation has been done in this study which highlights the strengths and weaknesses of all these techniques that have been used to find out the contributory factors of these incidents. In addition, the industries where these techniques have been used, have been identified and it is emphasized that these techniques should be applied in the textile industry in Pakistan which is the most accident prone industry in recent times. This study also leads to the realization that there is a need for newer techniques such as structural equation modelling that address the complex nature of accidents and deal with the interactions of contributory factors of accidents in large scale industries. It is also emphasized that the government should take the initiat...
Energy needs are increasing all over the world. The current sources of energy are decreasing rapi... more Energy needs are increasing all over the world. The current sources of energy are decreasing rapidly and their usage is causing environmental pollution including air and water pollution. Due to this reason, the need of the hour is to switch towards renewable and sustainable energy sources. The selection of a suitable renewable energy source is the most important task to meet the country’s energy need, especially in a scenario where these alternatives negatively affect the surrounding environment. Involvement of multiple benchmarks such as technical, environmental, economic, land occupy, and sustainability are making energy planning more complex for decision makers. Wind, biomass, hydrothermal, geothermal and solar are the alternative renewable energy sources in Pakistan. In such circumstances, companies need tools and techniques to find out the best solution in the contest of conflicting objectives, multiple alternatives and different criteria. Multi-Criteria Decision Making (MCDM) ...
Maintenance support system is formed by all the needed support resources which are related and co... more Maintenance support system is formed by all the needed support resources which are related and coordinated between each other to achieve certain objectives such as operational availability of the supported object during its life cycle. This paper describes the decision support system using simulation in the dynamic environment of vehicles repair and maintenance. The study illustrates a case relevant to repair and maintenance decision support system, in which different feasible scenarios has been modeled and modules developed for the analysis and improvement of the existing system. This is done by process mapping of the existing systems and modeling of the existing system in simulation language. Various feasible alternatives illuminated a pathway to significant improvements in customer service, management of work in process, resource utilization, over time and cycle time. It has been learnt that WIP and overtime are the major impediments in the system affecting the performance of the...
Journal of Engineering and Applied Sciences , University of Engineering and Technology, Peshawar, 2014
While selecting a global facility location, the decision makers normally have to face two types o... more While selecting a global facility location, the decision makers normally have to face two types of scenarios: exploring and prioritizing the factors affecting the location decision and selecting an appropriate optimization methodology, compatible to the said problem. This paper addresses a real world case study of the problem of selecting a country best suitable for a new cement plant installation among the list of four alternatives. The irreversible nature of the crucial decision requires analysis of wide range of factors with different optimization techniques. Therefore such factors were explored and prioritized from available literature and by recommendations of panel of experts followed by mathematical modelling of the said problem in four standard methodologies including the one presented in another paper earlier. The solutions were obtained by coding routines in the concerned programs. Stability analysis with respect to change of priorities and change of cost and capacity con...
International Journal of Precision Engineering and Manufacturing, 2021
The execution of sustainable manufacturing methods to make machining processes more eco-friendly ... more The execution of sustainable manufacturing methods to make machining processes more eco-friendly is a difficult task that has attracted significant attention from the industrial area for a long time. As one of the leading manufacturing processes, machining can have a profound impact on the environment, society, and financial aspects. In a specific scenario, recognizing reasonable machining conditions to supply cutting fluids utilizing eco-friendly methods is at present a significant focal point of academic and industrial sector research. This study is to investigate the optimal operational parameters such as speed, feed rate, and cutting depth during high-speed machining of 15CDV6 HSLA steel under near-dry (green machining) and flood lubrication using response surface methodology and an artificial neural network that leads to better performance measures like tool-chip interface temperature, specific energy, yield strength, and percentage elongation. Initially, tensile samples were prepared on wire EDM, further high-speed machining has been carried out on CNC milling using a mechanical carbide cutter to improve performance. The results showed that an improvement in tool-chip interface temperature (0.9–12%), specific energy (0.8–12%), yield strength (1.8–3.2%), and percentage elongation (1.0–8.9%) using green machining has been witnessed and confirmed that green machining is an alternative of the flood to enhance the strength while reducing the specific energy in addition to eco-friendly. Moreover, the comparative analysis between RSM and ANN results determined that the ANN delivers more precise results and confirms its adequacy when its correlation coefficients are large, and root mean square errors are small compared to those obtained through the RSM.
Thermal Science, 2020
Solar parabolic trough collector systems provide an attractive solution especially for solar ther... more Solar parabolic trough collector systems provide an attractive solution especially for solar thermal power generation. The performance of these systems significantly depends on receiver geometries. Therefore, in the current study, an experimental analysis has been performed using three different receiver geometries along-with two reflective materials. These receiver geometries include: simple tube (reference geometry A), receiver tube with straight absorber plate (geometry B), and receiver tube with curved absorber plate (geometry C), whereas, the reflective materials include: aluminum and stainless steel. The experimentation was performed under subtropical climate conditions of Taxila, Pakistan. From experimentation, it was identified that peak heat gain obtained from receiver geometries C and B were 71%, and 30% higher as compared to the reference geometry A, respectively. The, thermal efficiency of the system with geometry A was 20%, geometry B was 28%, and geometry C was 34%. Fu...
Science of The Total Environment, 2020
Multiple factors including technical, social, economic, regulatory, governmental, and environment... more Multiple factors including technical, social, economic, regulatory, governmental, and environmental add complexity in the process of selecting a suitable wastewater treatment technology. To overcome this issue, this paper aims to propose a decision support system (DSS) for the selection of wastewater treatment technologies. The proposed system has been developed using a detailed review of the state-of-the-art in wastewater treatment, implemented using Microsoft Visual Studio 2010 and validated through real-time case studies. The system is categorized into four treatment levels based on wastewater complexity and the required degree of treatment. These include preliminary, primary, secondary, and tertiary treatment. Based on the identified treatment levels, the proposed system suggests using any physical, biological, chemical, or hybrid treatment process. The developed DSS will aid the selection of suitable wastewater treatment technology from a set of alternatives while keeping user constraints, conflicting requirements, and prevailing conditions under consideration. Moreover, the system is capable to customize the treatment assembly at the planning stage with minimized costs, eliminate mistakes at the planning and design stage, facilitate decision making by narrowing down the alternative solution as per user requirements and prevailing conditions, incorporate customer demand, and promote sustainable development.
NED University Journal of Research, 2020
The sustainability of manufacturing systems is not thoroughly investigated in the existing litera... more The sustainability of manufacturing systems is not thoroughly investigated in the existing literature despite that fact that it affects service-oriented organisations. This paper addresses this gap by incorporating the criterion of energy consumption in mixed model assembly line sequencing (MMALS) to explore the potential for energy saving. Energy consumption was integrated with makespan and sequence dependent setup time of mixed models to achieve the sustainability in sequencing. A mathematical model was developed for the optimisation of energy efficient MMAL (EEMMAL). The multi-objective intelligent genetic algorithm (MOIGA) was proposed for minimisation of three conflicting objectives. A case study was conducted using centrifugal pump assembly line to test the performance of proposed MOIGA and the results were compared with those obtained from multi-objective genetic algorithm (MOGA). Finally, a trade-off analysis was conducted between total setup time, makespan (a service level ...
Journal of Basic & Applied Sciences, 2018
Industrial revolutions not only improved the general lifestyle of individuals but also brought an... more Industrial revolutions not only improved the general lifestyle of individuals but also brought an increase in the diversity of the manufactured goods. This diversification involved use of advanced technology and complex methods that entailed dangerous conditions. According to international labor organization, occupational accidents cause death of more than two million individuals each year in different industries. Process industries are complex in nature and tend to lead to more accidents. In Pakistan among the process industries, textile mills are the most accident prone industries in recent times. Therefore, an empirical analysis of a textile process industry has been done using structural equation modelling to examine the interactions between the contributory factors of accidents. Results revealed that unsafe acts are a major contributor to human error, equipment error and unsafe environment that in turn lead to the calamities and disasters that can be avoided with proper safety ...
International Journal of Quality and Innovation, 2017
This research aims to address the applications of variants of ant colony optimisation (ACO) appro... more This research aims to address the applications of variants of ant colony optimisation (ACO) approach to solve no-wait flow shop scheduling problem (NW-FSSP). The most suitable ACO algorithm out of basic algorithms has been selected and modified to achieve more purified results. The algorithm was coded in visual basic. The varied algorithm has been applied to the bench mark problems and results were compared with the results achieved previously by other researchers using different meta-heuristics. The research covers detailed steps carried out for application of basic ACO algorithms on bench mark problems, comparison of results achieved by application of basic ACO algorithms, selection of best out of basic algorithms, modification of selected basic algorithm and generation of varied ACO algorithm. The varied ACO algorithm gave reasonably good results for almost all the problems under consideration and was able to handle fairly large sized problems with far less computational time. Comparative analysis depicted that the proposed ACO algorithm performed better than genetic algorithm on large sized problems and better than Rajendran heuristic in almost all problems under considerations.
International Journal of Quality and Innovation, 2017
This paper presents a genetic algorithm for a job shop scheduling problem with parallel machines.... more This paper presents a genetic algorithm for a job shop scheduling problem with parallel machines. The objective is to minimise the makespan. After solving an example, the performance of the proposed algorithm was examined on a set of test problems. The computational test was performed with moderate benchmark instances given in the literature. Now, many industrial work centres are shifting their focus towards implementation of job shop scheduling model. Large throughput and just-in-time restrictions have augmented the requirement of additional parallel machines at various production stages. This generates the scope for research on optimising job shop problem with parallel machines. However, research on this topic is very limited as compared to other job shop problems. A genetic algorithm has been proposed in this research work which effectively finds the near optimal makespan schedules for the job shop problem with parallel machines. The algorithm was implemented on the modified benchmarks from the literature and the results were compared with heuristics methods available in literature for solving this problem. It is shown that the proposed GA performs reasonably well when compared to the other techniques under consideration.
NED University Journal of Research, 2019
Resource constrained project scheduling problem has significant application in industries. Althou... more Resource constrained project scheduling problem has significant application in industries. Although several heuristic solutions have been developed in the literature to address this problem, most of these have lesser focus on scheduling of shared and scarce resources. The presented study proposes a resource optimisation based heuristic (ROBH) to optimise the utilisation of shared resources so as to minimise the penalty cost of projects. The proposed ROBH identifies shared resources within the project activities and shifts the activities from the bottleneck resource to the residual resources. The performance of the proposed ROBH was tested using the standard benchmark instances of project scheduling problems available in the existing literature. The results were compared with those obtained from the heuristics available in the project scheduling problem library. This comparison indicated that the results provided by ROBH are significant as compared to the results obtained from the he...
International Journal of Engineering & Technology, 2018
A novel internal combustion engine termed as Crank Rocker Engine has been developed at Universiti... more A novel internal combustion engine termed as Crank Rocker Engine has been developed at Universiti Teknologi PETRONAS (UTP) Malaysia. In the existing design, the engine cylinder is cooled through forced convection which is not efficient and malfunctioning of cooling system could lead to engine overheating. The objective of the current study is to develop a concept of an integrated and customized cooling system for the Crank-Rocker engine and to develop through rapid prototyping (RP). The proposed cooling system comprises of an integrated cooling water jacket around the engine cylinder, which works on the principle of forced convection. The forced convection is energy intensive and not suitable for stationary engines. Therefore, an enhanced design of the cooling system is required to improve the overall performance of the engine. Since the engine cylinder is curved, the conventional manufacturing technologies could be difficult to apply for the development of cooling system. For swift...