OLAYINKA OLABANJI - Academia.edu (original) (raw)
Papers by OLAYINKA OLABANJI
Journal of Emerging Trends in Engineering and Applied Sciences, Aug 1, 2014
1 Ayodeji S. P; 2 Olabanji O. M; 3 Akinnuli B. O 1, 2 Tshwane University of Technology Pretoria W... more 1 Ayodeji S. P; 2 Olabanji O. M; 3 Akinnuli B. O 1, 2 Tshwane University of Technology Pretoria West, South Africa 3 Federal University of Technology, Akure, Nigeria. Corresponding Author: Ayodeji S. P _________________________________________________________________________________________ Abstract Limited or poor food preservation techniques and capacity causes post-harvest losses of food crops and initiates the problem of food and nutritional insecurity in the country. In other to solve this problem, food crops needs to be processed into a lasting and nutritious consumable form, through the use of mechanization. In this research an easily operated and user friendly sieving machine was developed to sieve poundo yam flour in a process plant. The components parts of the machine was designed and a detailed material selection analysis was done. The cost of producing the machine was estimated to be while the capacity of the machine was derived
International Journal of Design Engineering, 2018
This article presents the design process of a reconfigurable assembly fixture (RAF) using a fuzzi... more This article presents the design process of a reconfigurable assembly fixture (RAF) using a fuzzified weighted decision matrix (FWDM) process. In order to consider various functional requirement and design criteria of the RAF and associated sub-factors for each criterion. The developed FWDM process combined the fuzzy weighted sum and fuzzy weighted product model. A framework for the application of the FWDM is developed in order to simplify the application process. Sub-factors associated to functional requirement for the optimal design of the RAF are identified considering a mixed scenario using the concept of triangular fuzzy number. Four CAD models of the RAF were considered in order to decide on the optimal design. Results obtained from the FWDM process showed that the cumulative weight of ranking designs based on selected criteria or design features shows a particular design concept to be better than another. However, a consideration of a holistic view of the level of importance of the functional requirement in the optimal design makes the weighted score of each of the design to have close values.
International Journal of Engineering and Manufacturing, Aug 8, 2022
This article presents the design, simulation, fabrication and performance evaluation of a liquid ... more This article presents the design, simulation, fabrication and performance evaluation of a liquid spraying machine for application of pesticides in a small and medium scale crop plantation. In this article, components of the conceptualized spraying machine were modelled and assembled in SolidWorks CAD environment. The modelled components were designed in order to obtain design parameters for simulation. An extensive simulation on the stress and strain analysis was carried out on the designed components. The significance of the simulation is to predict the structural integrity and performance of the component parts of the machine before fabrication. The components were fabricated from locally sourced material in order to ensure a lower cost of production. The fabricated spraying machine was tested and the performance indicated that a field efficiency of 79% is obtainable in an average time of 1374 s to spray a maize crop field area of 1813 m 2 having an average crop height of 0.52m. Further observations from the performance analysis also show that the field efficiency of the spraying machine drops to a value of 75% when used in a crop field area of 2206.3 m 2. This is an indication that the spraying machine's efficiency will reduce as the field area increases. In essence, the significance of the approach presented in this article is to ensure that the simulation predicts the performance of the design and the fabrication of the spraying machine using locally sourced material will ensure lower cost of fabrication.
DergiPark (Istanbul University), Jun 30, 2019
This article addresses the challenges of estimating production capacity and time utilization prob... more This article addresses the challenges of estimating production capacity and time utilization problem in a sequential process plant. A framework and mathematical model are presented to aid the analysis and understanding of the proposed solution. A set of constraints is provided in order to specify the requirements for production capacity and time utilization planning in a sequential process plant. In order to ascertain the performance of the framework, the mathematical models derived are tested using an existing designed process plant and the results obtained from the evaluation are also presented. The proposed model generates the utilized time for the process plant per batch and also the production capacity of the process plant as well as the production rates of individual machines in the process plant. Application of the model to an existing process plant demonstrates that the addition of buffer storage to store work in progress materials in a mono product sequential process plant will increase the production rate of the plant but the production rate of the machines in the plant remains constant. Also, the addition of buffer storage will increase the time utilized by the process plant to complete its operation per batch.
International journal of fuzzy system applications, Jun 24, 2022
Concept selection in design is an important aspect of design process that must be done properly w... more Concept selection in design is an important aspect of design process that must be done properly with the right tools. The identification of optimal design is presented in this article by integrating three Multicriteria decision making models which are fuzzified pairwise comparison matrices, fuzzified weighted decision matrix and fuzzy VIKOR. Rather than depending solely on design expert’s view to determine weights of the design features, the pairwise comparison matrices determines the weights of design features and sub features in the decision process. The weighted decision matrix aggregates scores for the alternative designs considering the availability of sub features in them. The aggregated scores form the elements of the main decision matrix together with the weights of the design features and the Fuzzy VIKOR model determines the performance index of the design concepts. The hybridized model was validated using four conceptual designs of liquid spraying machines and the results obtained shows that the model provides computational integrity in decision making process.
South African Journal of Industrial Engineering, 2022
Manufacturing organizations are under continuous pressure to implement sustainability in their ac... more Manufacturing organizations are under continuous pressure to implement sustainability in their activities. There is a need to identify the environmental hotspots in the manufacturing processes of the products. In this research life cycle assessment technique has been used to achieve the objective of identifying the maximum impact-generating processes in the production of a pharmaceutical product named 'Paracetamol tablet.' The study identifies the environmental impacts of the paracetamol tablet manufacturing in the endpoint and midpoint impact categories. Three main environmental hotspot processes are identified during this study. The midpoint assessment results show that the 'blister packing' is the top environmental hotspot owing to the consumption of resources of the packaging material. 'Blister packing' has a significant contribution to the seven impact categories. Blister packaging has more than 70% environmental impact in freshwater eutrophication and human toxicity categories. The packaging for the tablet mainly consists of the PVC and aluminum blister, which cause a lot of environmental impact during their production. The 'Blister packing' process is followed by the 'sieving process,' which has more than 80% contribution in land use and metal depletion impact category. To reduce the impacts arising during the 'sieving' process will require improvements in the electricity mix, such as increasing the renewable component in the mix. The third hotspot process is 'steam production,' which shows its presence in almost all the categories varying from 8% to 50%. More efficient ways of steam production like solar-based steam generation will make steam production more environmentally viable. The robustness of the results has been verified using the sensitivity analysis. Possible solutions to reduce the environmental impacts of the hotspot processes have been provided.
DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2020
Decision-making models such as Analytical Hierarchy Process (AHP), Weighted Decision Matrix (WDM)... more Decision-making models such as Analytical Hierarchy Process (AHP), Weighted Decision Matrix (WDM), Pugh Matrix and the likes have been able to assist in the decision process considering the objectives of each evaluation criteria in the alternatives. However, these models need to consider the qualitative and subjective nature of the design features. In order to reduce the unbalanced scale of judgment and the uncertainty associated with the crisp information in the decision process, fuzzified and hybridized models are necessary. Existing hybridized decision models applied for machine concept selection deploy several design features and sub-features at the conceptual product design, which thus make the decision making process to be tedious. In light of this, this article presents a hybridized decision-making model, which harness the comparative strength and computational integrity of fuzzy pairwise comparison matrix and fuzzy weighted average, to numerically analyse a reasonable amount of machine design features, thereby making decision making process less tedious. Design for reconfigurability and functionality which are peculiar to reconfigurable machines was introduced using a Reconfigurable Assembly Fixture (RAF) as a case study while other design features related to design concept evaluation were grouped under design for X. The result of the hybridized model shows that, concept three is the optimal design from four sets of designs. This is compared to previous publication using the RAF design concepts with different design features and sub-features. The comparison indicates that there is a close range in the final values of the designs due to the inclusion of several sub-features in the decision process which were not used in the previous study.
International Journal of Manufacturing Research
International Journal of Engineering, 2019
This article addresses the challenges of estimating production capacity and time utilization prob... more This article addresses the challenges of estimating production capacity and time utilization problem in a sequential process plant. A framework and mathematical model are presented to aid the analysis and understanding of the proposed solution. A set of constraints is provided in order to specify the requirements for production capacity and time utilization planning in a sequential process plant. In order to ascertain the performance of the framework, the mathematical models derived are tested using an existing designed process plant and the results obtained from the evaluation are also presented. The proposed model generates the utilized time for the process plant per batch and also the production capacity of the process plant as well as the production rates of individual machines in the process plant. Application of the model to an existing process plant demonstrates that the addition of buffer storage to store work in progress materials in a mono product sequential process plant ...
International Journal of Automation and Control, 2020
Electric Power Components and Systems, 2003
Page 1. EMP 31(7) #5616 Electric Power Components and Systems, 31:671692, 2003 Copyright c Taylo... more Page 1. EMP 31(7) #5616 Electric Power Components and Systems, 31:671692, 2003 Copyright c Taylor & Francis Inc. ISSN: 1532-5008 print/1532-5016 online DOI: 10.1080/15325000390203674 Design Simulation and Experimental Investigations ...
Procedia CIRP, 2014
Reconfigurable assembly fixtures are major components of a reconfigurable assembly system. They a... more Reconfigurable assembly fixtures are major components of a reconfigurable assembly system. They are precision components which require an intensive design process due to their usage and interaction with other components in the assembly system. Concept selection is a time consuming activity in the engineering design process, because it involves decision making and consideration of multiple factors. A computer aided design approach of four concepts was developed for a reconfigurable assembly fixture, based on functional requirements, cost, and manufacturability. The weighted decision matrix and analytical hierarchy process was used to compare these concepts. The decision criteria and evaluation technique used during this concept selection process is novel thus calling for its application in design of engineering components. The results of the two methods are presented graphically and the variations in the results obtained are used to judge the suitable method among both processes for the optimal design.
IEEE Access, 2020
This paper presents the sustainability assessment for reconfigurable machines based on cosine sim... more This paper presents the sustainability assessment for reconfigurable machines based on cosine similarity measures and Euclidean distances. The methodology entails the application of four peculiar sustainability indicators (Reconfigurability, Manufacturing, Functionality, and Life Cycle Analysis) that are suitable for reconfigurable machines alongside the traditional sustainability indicators (Environmental, Social, and Economic). An index relating chart approach is proposed for determining the indices of the peculiar and traditional sustainability indicators and their sub-indicators. The chart involves the identification of viable links of the sub-indicators of an indicator and the sub-indicators of other indicators. The viable links are fuzzified using the fuzzy trapezoidal set because of the multi-dimensions and units of the sustainability indicators. The cosine similarity measures of the sustainability indicators were aggregated to estimate the sustainable similarity measures of the reconfigurable machines while the Euclidean distance estimates the distances of the indicators to best and worst sustainable performance in order to identify the sustainability indicators for improvement. Experts' opinions are applied to appraise the availability of sub-indicators in the four reconfigurable machine prototypes (vibrating screen, assembly fixture, bending press machine, and flexible fixture) used as case studies. A sensitivity analysis was carried out to validate the computational process of the methodology. The sensitivity analysis shows that the application of cosine similarity measures is suitable for assessment of sustainability considering the closeness of the similarity measures for the defuzzified values of the trapezoidal fuzzy numbers and the cosine similarity values of the aggregating matrix of the indicators. Also, the findings that can be deduced from the results of the appraisal of the case studies presented in this article shows that high sustainable index and similarity measures can be achieved by creating a balance in the performance of all the sustainable indicators. The results from the assessment also support the fact that improving one sustainability indicator because of its closeness to the worst sustainable performance may cause other indicators not to perform satisfactorily.
Decision Science Letters, 2020
Deciding conceptual stage of engineering design to identify an optimal design concept from a set ... more Deciding conceptual stage of engineering design to identify an optimal design concept from a set of alternatives is a task of great interest for manufacturers because it has an impact on profitability of the manufacturing firms in terms of extending product demand life cycle and gaining more market share. To achieve this task, design concepts encompassing all required attributes are developed and the decision is made on the optimal design concept. This article proposes the modeling of decision making in the conceptual design stage of a product as a multicriteria decision making analysis. The proposition is based on the fact that the design concepts can be decided based on considering the available design features and various sub-features under each design feature. Pairwise comparison matrix of fuzzy analytic hierarchy process is applied to determine the weights for all design features and their sub-features depending on the importance to the design features to the optimal design and contributions of the sub-features to the performance of the main design features. Fuzzified Pugh matrices are developed for assessing the availability of the sub-features in the design concept. The cumulative from the Pugh matrices produced a pairwise comparison matrix for the design features from which the design concepts are ranked using a minimum degree of possibility. The result obtained show that the decision process did not arbitrarily apportion weights to the design concepts because of the moderate differences in the final weights. .
Production and Manufacturing Research: An Open Access Journal, 2021
ABSTRACT This article presents a new technique for determining the weights of design features by ... more ABSTRACT This article presents a new technique for determining the weights of design features by searching for functional links between their sub-features. The method further applies fuzzy VIKOR based on left and right scores to determine the optimal design concept from a decision matrix obtained from three experts view. The application of this technique to the design of a Reconfigurable Assembly Fixture (RAF) shows that it is a viable method for determining the weights of design features and identifying the optimal design concept from a set of alternative designs. In order to support the viability of this technique, the results obtained from its application to the design of a RAF was compared with the results of other Multi-Criteria Decision-Making (MCDM) methods when applied to the design of the RAF. The comparison shows that the technique is feasible and can be employed to determine the weights of design features in order to identify optimal design at the conceptual phase.
Results in engineering, Mar 1, 2021
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Journal of Engineering, Design and Technology, 2019
Purpose The purpose of this paper is to determine the suitability of adopting hybridized multicri... more Purpose The purpose of this paper is to determine the suitability of adopting hybridized multicriteria decision-making models as a decision tool in engineering design. This decision tool will assist design engineers and manufacturers to determine a robust design concept before simulation and manufacturing while all the design features and sub features would have been identified during the decision-making process. Design/methodology/approach Fuzzy analytical hierarchy process (FAHP) and fuzzy technique for order preference by similarity to ideal solution (FTOPSIS) are hybridized and applied to obtain optimal design of a reconfigurable assembly fixture (RAF) from a set of alternative design concepts. Design features and sub features associated with the RAF are identified and compared using fuzzified pairwise comparison matrices to obtain weights of their relative importance in the optimal design. The FAHP obtained the fuzzy synthetic extent (FSE) values of the design features and sub ...
Procedia CIRP, 2019
In today's business environment, the trend towards more product variety and customization is unbr... more In today's business environment, the trend towards more product variety and customization is unbroken. Due to this development, the need of agile and reconfigurable production systems emerged to cope with various products and product families. To design and optimize production systems as well as to choose the optimal product matches, product analysis methods are needed. Indeed, most of the known methods aim to analyze a product or one product family on the physical level. Different product families, however, may differ largely in terms of the number and nature of components. This fact impedes an efficient comparison and choice of appropriate product family combinations for the production system. A new methodology is proposed to analyze existing products in view of their functional and physical architecture. The aim is to cluster these products in new assembly oriented product families for the optimization of existing assembly lines and the creation of future reconfigurable assembly systems. Based on Datum Flow Chain, the physical structure of the products is analyzed. Functional subassemblies are identified, and a functional analysis is performed. Moreover, a hybrid functional and physical architecture graph (HyFPAG) is the output which depicts the similarity between product families by providing design support to both, production system planners and product designers. An illustrative example of a nail-clipper is used to explain the proposed methodology. An industrial case study on two product families of steering columns of thyssenkrupp Presta France is then carried out to give a first industrial evaluation of the proposed approach.
Assembly Automation, 2015
Purpose – The purpose of this study is to develop a new mathematical model and an exact solution ... more Purpose – The purpose of this study is to develop a new mathematical model and an exact solution method for an assembly line rebalancing problem. When an existing assembly line has to be adapted to a new production context, the line balancing, resources allocation and component management solutions have to be revised. The objective is to minimize the number of modifications to be done in the initial line in order to reduce the time and investment needed to meet new production requirements. The proposed model is evaluated via a computational experiment. The obtained results the efficacy of the proposed method. Design/methodology/approach – This paper develops a new mathematical model and an exact solution method for an assembly line rebalancing problem with the objective to minimize the number of modifications to be done in the initial line to reduce the time and investments needed to meet new production requirements. Findings – The computational experiments show the efficacy of the ...
Journal of Emerging Trends in Engineering and Applied Sciences, Aug 1, 2014
1 Ayodeji S. P; 2 Olabanji O. M; 3 Akinnuli B. O 1, 2 Tshwane University of Technology Pretoria W... more 1 Ayodeji S. P; 2 Olabanji O. M; 3 Akinnuli B. O 1, 2 Tshwane University of Technology Pretoria West, South Africa 3 Federal University of Technology, Akure, Nigeria. Corresponding Author: Ayodeji S. P _________________________________________________________________________________________ Abstract Limited or poor food preservation techniques and capacity causes post-harvest losses of food crops and initiates the problem of food and nutritional insecurity in the country. In other to solve this problem, food crops needs to be processed into a lasting and nutritious consumable form, through the use of mechanization. In this research an easily operated and user friendly sieving machine was developed to sieve poundo yam flour in a process plant. The components parts of the machine was designed and a detailed material selection analysis was done. The cost of producing the machine was estimated to be while the capacity of the machine was derived
International Journal of Design Engineering, 2018
This article presents the design process of a reconfigurable assembly fixture (RAF) using a fuzzi... more This article presents the design process of a reconfigurable assembly fixture (RAF) using a fuzzified weighted decision matrix (FWDM) process. In order to consider various functional requirement and design criteria of the RAF and associated sub-factors for each criterion. The developed FWDM process combined the fuzzy weighted sum and fuzzy weighted product model. A framework for the application of the FWDM is developed in order to simplify the application process. Sub-factors associated to functional requirement for the optimal design of the RAF are identified considering a mixed scenario using the concept of triangular fuzzy number. Four CAD models of the RAF were considered in order to decide on the optimal design. Results obtained from the FWDM process showed that the cumulative weight of ranking designs based on selected criteria or design features shows a particular design concept to be better than another. However, a consideration of a holistic view of the level of importance of the functional requirement in the optimal design makes the weighted score of each of the design to have close values.
International Journal of Engineering and Manufacturing, Aug 8, 2022
This article presents the design, simulation, fabrication and performance evaluation of a liquid ... more This article presents the design, simulation, fabrication and performance evaluation of a liquid spraying machine for application of pesticides in a small and medium scale crop plantation. In this article, components of the conceptualized spraying machine were modelled and assembled in SolidWorks CAD environment. The modelled components were designed in order to obtain design parameters for simulation. An extensive simulation on the stress and strain analysis was carried out on the designed components. The significance of the simulation is to predict the structural integrity and performance of the component parts of the machine before fabrication. The components were fabricated from locally sourced material in order to ensure a lower cost of production. The fabricated spraying machine was tested and the performance indicated that a field efficiency of 79% is obtainable in an average time of 1374 s to spray a maize crop field area of 1813 m 2 having an average crop height of 0.52m. Further observations from the performance analysis also show that the field efficiency of the spraying machine drops to a value of 75% when used in a crop field area of 2206.3 m 2. This is an indication that the spraying machine's efficiency will reduce as the field area increases. In essence, the significance of the approach presented in this article is to ensure that the simulation predicts the performance of the design and the fabrication of the spraying machine using locally sourced material will ensure lower cost of fabrication.
DergiPark (Istanbul University), Jun 30, 2019
This article addresses the challenges of estimating production capacity and time utilization prob... more This article addresses the challenges of estimating production capacity and time utilization problem in a sequential process plant. A framework and mathematical model are presented to aid the analysis and understanding of the proposed solution. A set of constraints is provided in order to specify the requirements for production capacity and time utilization planning in a sequential process plant. In order to ascertain the performance of the framework, the mathematical models derived are tested using an existing designed process plant and the results obtained from the evaluation are also presented. The proposed model generates the utilized time for the process plant per batch and also the production capacity of the process plant as well as the production rates of individual machines in the process plant. Application of the model to an existing process plant demonstrates that the addition of buffer storage to store work in progress materials in a mono product sequential process plant will increase the production rate of the plant but the production rate of the machines in the plant remains constant. Also, the addition of buffer storage will increase the time utilized by the process plant to complete its operation per batch.
International journal of fuzzy system applications, Jun 24, 2022
Concept selection in design is an important aspect of design process that must be done properly w... more Concept selection in design is an important aspect of design process that must be done properly with the right tools. The identification of optimal design is presented in this article by integrating three Multicriteria decision making models which are fuzzified pairwise comparison matrices, fuzzified weighted decision matrix and fuzzy VIKOR. Rather than depending solely on design expert’s view to determine weights of the design features, the pairwise comparison matrices determines the weights of design features and sub features in the decision process. The weighted decision matrix aggregates scores for the alternative designs considering the availability of sub features in them. The aggregated scores form the elements of the main decision matrix together with the weights of the design features and the Fuzzy VIKOR model determines the performance index of the design concepts. The hybridized model was validated using four conceptual designs of liquid spraying machines and the results obtained shows that the model provides computational integrity in decision making process.
South African Journal of Industrial Engineering, 2022
Manufacturing organizations are under continuous pressure to implement sustainability in their ac... more Manufacturing organizations are under continuous pressure to implement sustainability in their activities. There is a need to identify the environmental hotspots in the manufacturing processes of the products. In this research life cycle assessment technique has been used to achieve the objective of identifying the maximum impact-generating processes in the production of a pharmaceutical product named 'Paracetamol tablet.' The study identifies the environmental impacts of the paracetamol tablet manufacturing in the endpoint and midpoint impact categories. Three main environmental hotspot processes are identified during this study. The midpoint assessment results show that the 'blister packing' is the top environmental hotspot owing to the consumption of resources of the packaging material. 'Blister packing' has a significant contribution to the seven impact categories. Blister packaging has more than 70% environmental impact in freshwater eutrophication and human toxicity categories. The packaging for the tablet mainly consists of the PVC and aluminum blister, which cause a lot of environmental impact during their production. The 'Blister packing' process is followed by the 'sieving process,' which has more than 80% contribution in land use and metal depletion impact category. To reduce the impacts arising during the 'sieving' process will require improvements in the electricity mix, such as increasing the renewable component in the mix. The third hotspot process is 'steam production,' which shows its presence in almost all the categories varying from 8% to 50%. More efficient ways of steam production like solar-based steam generation will make steam production more environmentally viable. The robustness of the results has been verified using the sensitivity analysis. Possible solutions to reduce the environmental impacts of the hotspot processes have been provided.
DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2020
Decision-making models such as Analytical Hierarchy Process (AHP), Weighted Decision Matrix (WDM)... more Decision-making models such as Analytical Hierarchy Process (AHP), Weighted Decision Matrix (WDM), Pugh Matrix and the likes have been able to assist in the decision process considering the objectives of each evaluation criteria in the alternatives. However, these models need to consider the qualitative and subjective nature of the design features. In order to reduce the unbalanced scale of judgment and the uncertainty associated with the crisp information in the decision process, fuzzified and hybridized models are necessary. Existing hybridized decision models applied for machine concept selection deploy several design features and sub-features at the conceptual product design, which thus make the decision making process to be tedious. In light of this, this article presents a hybridized decision-making model, which harness the comparative strength and computational integrity of fuzzy pairwise comparison matrix and fuzzy weighted average, to numerically analyse a reasonable amount of machine design features, thereby making decision making process less tedious. Design for reconfigurability and functionality which are peculiar to reconfigurable machines was introduced using a Reconfigurable Assembly Fixture (RAF) as a case study while other design features related to design concept evaluation were grouped under design for X. The result of the hybridized model shows that, concept three is the optimal design from four sets of designs. This is compared to previous publication using the RAF design concepts with different design features and sub-features. The comparison indicates that there is a close range in the final values of the designs due to the inclusion of several sub-features in the decision process which were not used in the previous study.
International Journal of Manufacturing Research
International Journal of Engineering, 2019
This article addresses the challenges of estimating production capacity and time utilization prob... more This article addresses the challenges of estimating production capacity and time utilization problem in a sequential process plant. A framework and mathematical model are presented to aid the analysis and understanding of the proposed solution. A set of constraints is provided in order to specify the requirements for production capacity and time utilization planning in a sequential process plant. In order to ascertain the performance of the framework, the mathematical models derived are tested using an existing designed process plant and the results obtained from the evaluation are also presented. The proposed model generates the utilized time for the process plant per batch and also the production capacity of the process plant as well as the production rates of individual machines in the process plant. Application of the model to an existing process plant demonstrates that the addition of buffer storage to store work in progress materials in a mono product sequential process plant ...
International Journal of Automation and Control, 2020
Electric Power Components and Systems, 2003
Page 1. EMP 31(7) #5616 Electric Power Components and Systems, 31:671692, 2003 Copyright c Taylo... more Page 1. EMP 31(7) #5616 Electric Power Components and Systems, 31:671692, 2003 Copyright c Taylor & Francis Inc. ISSN: 1532-5008 print/1532-5016 online DOI: 10.1080/15325000390203674 Design Simulation and Experimental Investigations ...
Procedia CIRP, 2014
Reconfigurable assembly fixtures are major components of a reconfigurable assembly system. They a... more Reconfigurable assembly fixtures are major components of a reconfigurable assembly system. They are precision components which require an intensive design process due to their usage and interaction with other components in the assembly system. Concept selection is a time consuming activity in the engineering design process, because it involves decision making and consideration of multiple factors. A computer aided design approach of four concepts was developed for a reconfigurable assembly fixture, based on functional requirements, cost, and manufacturability. The weighted decision matrix and analytical hierarchy process was used to compare these concepts. The decision criteria and evaluation technique used during this concept selection process is novel thus calling for its application in design of engineering components. The results of the two methods are presented graphically and the variations in the results obtained are used to judge the suitable method among both processes for the optimal design.
IEEE Access, 2020
This paper presents the sustainability assessment for reconfigurable machines based on cosine sim... more This paper presents the sustainability assessment for reconfigurable machines based on cosine similarity measures and Euclidean distances. The methodology entails the application of four peculiar sustainability indicators (Reconfigurability, Manufacturing, Functionality, and Life Cycle Analysis) that are suitable for reconfigurable machines alongside the traditional sustainability indicators (Environmental, Social, and Economic). An index relating chart approach is proposed for determining the indices of the peculiar and traditional sustainability indicators and their sub-indicators. The chart involves the identification of viable links of the sub-indicators of an indicator and the sub-indicators of other indicators. The viable links are fuzzified using the fuzzy trapezoidal set because of the multi-dimensions and units of the sustainability indicators. The cosine similarity measures of the sustainability indicators were aggregated to estimate the sustainable similarity measures of the reconfigurable machines while the Euclidean distance estimates the distances of the indicators to best and worst sustainable performance in order to identify the sustainability indicators for improvement. Experts' opinions are applied to appraise the availability of sub-indicators in the four reconfigurable machine prototypes (vibrating screen, assembly fixture, bending press machine, and flexible fixture) used as case studies. A sensitivity analysis was carried out to validate the computational process of the methodology. The sensitivity analysis shows that the application of cosine similarity measures is suitable for assessment of sustainability considering the closeness of the similarity measures for the defuzzified values of the trapezoidal fuzzy numbers and the cosine similarity values of the aggregating matrix of the indicators. Also, the findings that can be deduced from the results of the appraisal of the case studies presented in this article shows that high sustainable index and similarity measures can be achieved by creating a balance in the performance of all the sustainable indicators. The results from the assessment also support the fact that improving one sustainability indicator because of its closeness to the worst sustainable performance may cause other indicators not to perform satisfactorily.
Decision Science Letters, 2020
Deciding conceptual stage of engineering design to identify an optimal design concept from a set ... more Deciding conceptual stage of engineering design to identify an optimal design concept from a set of alternatives is a task of great interest for manufacturers because it has an impact on profitability of the manufacturing firms in terms of extending product demand life cycle and gaining more market share. To achieve this task, design concepts encompassing all required attributes are developed and the decision is made on the optimal design concept. This article proposes the modeling of decision making in the conceptual design stage of a product as a multicriteria decision making analysis. The proposition is based on the fact that the design concepts can be decided based on considering the available design features and various sub-features under each design feature. Pairwise comparison matrix of fuzzy analytic hierarchy process is applied to determine the weights for all design features and their sub-features depending on the importance to the design features to the optimal design and contributions of the sub-features to the performance of the main design features. Fuzzified Pugh matrices are developed for assessing the availability of the sub-features in the design concept. The cumulative from the Pugh matrices produced a pairwise comparison matrix for the design features from which the design concepts are ranked using a minimum degree of possibility. The result obtained show that the decision process did not arbitrarily apportion weights to the design concepts because of the moderate differences in the final weights. .
Production and Manufacturing Research: An Open Access Journal, 2021
ABSTRACT This article presents a new technique for determining the weights of design features by ... more ABSTRACT This article presents a new technique for determining the weights of design features by searching for functional links between their sub-features. The method further applies fuzzy VIKOR based on left and right scores to determine the optimal design concept from a decision matrix obtained from three experts view. The application of this technique to the design of a Reconfigurable Assembly Fixture (RAF) shows that it is a viable method for determining the weights of design features and identifying the optimal design concept from a set of alternative designs. In order to support the viability of this technique, the results obtained from its application to the design of a RAF was compared with the results of other Multi-Criteria Decision-Making (MCDM) methods when applied to the design of the RAF. The comparison shows that the technique is feasible and can be employed to determine the weights of design features in order to identify optimal design at the conceptual phase.
Results in engineering, Mar 1, 2021
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Journal of Engineering, Design and Technology, 2019
Purpose The purpose of this paper is to determine the suitability of adopting hybridized multicri... more Purpose The purpose of this paper is to determine the suitability of adopting hybridized multicriteria decision-making models as a decision tool in engineering design. This decision tool will assist design engineers and manufacturers to determine a robust design concept before simulation and manufacturing while all the design features and sub features would have been identified during the decision-making process. Design/methodology/approach Fuzzy analytical hierarchy process (FAHP) and fuzzy technique for order preference by similarity to ideal solution (FTOPSIS) are hybridized and applied to obtain optimal design of a reconfigurable assembly fixture (RAF) from a set of alternative design concepts. Design features and sub features associated with the RAF are identified and compared using fuzzified pairwise comparison matrices to obtain weights of their relative importance in the optimal design. The FAHP obtained the fuzzy synthetic extent (FSE) values of the design features and sub ...
Procedia CIRP, 2019
In today's business environment, the trend towards more product variety and customization is unbr... more In today's business environment, the trend towards more product variety and customization is unbroken. Due to this development, the need of agile and reconfigurable production systems emerged to cope with various products and product families. To design and optimize production systems as well as to choose the optimal product matches, product analysis methods are needed. Indeed, most of the known methods aim to analyze a product or one product family on the physical level. Different product families, however, may differ largely in terms of the number and nature of components. This fact impedes an efficient comparison and choice of appropriate product family combinations for the production system. A new methodology is proposed to analyze existing products in view of their functional and physical architecture. The aim is to cluster these products in new assembly oriented product families for the optimization of existing assembly lines and the creation of future reconfigurable assembly systems. Based on Datum Flow Chain, the physical structure of the products is analyzed. Functional subassemblies are identified, and a functional analysis is performed. Moreover, a hybrid functional and physical architecture graph (HyFPAG) is the output which depicts the similarity between product families by providing design support to both, production system planners and product designers. An illustrative example of a nail-clipper is used to explain the proposed methodology. An industrial case study on two product families of steering columns of thyssenkrupp Presta France is then carried out to give a first industrial evaluation of the proposed approach.
Assembly Automation, 2015
Purpose – The purpose of this study is to develop a new mathematical model and an exact solution ... more Purpose – The purpose of this study is to develop a new mathematical model and an exact solution method for an assembly line rebalancing problem. When an existing assembly line has to be adapted to a new production context, the line balancing, resources allocation and component management solutions have to be revised. The objective is to minimize the number of modifications to be done in the initial line in order to reduce the time and investment needed to meet new production requirements. The proposed model is evaluated via a computational experiment. The obtained results the efficacy of the proposed method. Design/methodology/approach – This paper develops a new mathematical model and an exact solution method for an assembly line rebalancing problem with the objective to minimize the number of modifications to be done in the initial line to reduce the time and investments needed to meet new production requirements. Findings – The computational experiments show the efficacy of the ...