Waluyo Adi Siswanto | Universitas Muhammadiyah Surakarta (original) (raw)
Papers by Waluyo Adi Siswanto
International Journal of Mechanical Engineering and Technology (IJMET), 2018
This paper presents the effect of humidity on the goat skin membrane of traditional musical instr... more This paper presents the effect of humidity on the goat skin membrane of traditional musical instrument kompang. Three kompang samples with similar size of 25 cm diameter were exposed to three different relative humidity (RH) conditions (50% RH, 70% RH and 90% RH) under the Climate Chamber. The tension and the vibration frequency were measured every 8 hours in anechoic enclosure. It is found that after 48 hours of humidity exposure, the tension of the membrane reduced by 6.2% for 50% RH, 13.1% for 70% RH and 21.5% for 90% RH. The frequency of the sound produced by the membrane also lowered by 4.6% for 50% RH, 18.7% for 70% RH and 26.4% for 90% RH. The goatskin membrane is sensitive to the humidity so that the sound changes to lower frequency as the humidity increases. The lowering frequency is due to the tension lost of the goatskin membrane.
International Journal of Mechanical Engineering and Technology (IJMET), 2018
This work is the development of boundary element method for elastoplastic plate analysis to inclu... more This work is the development of boundary element method for elastoplastic plate analysis to include elastic-linear hardening material. The plate is subjected to bending, in-plane and combined bending and in-plane. The plastic zone is evaluated by using von Mises criterion. The cell discretization is implemented to solve numerically the domain integral caused by plasticity. To evaluate the nonlinear term in the formulation of the boundary element, a total incremental technique is implemented. The capability of the development in this work will be presented by having numerical examples.
Pertanika Journal of Science & Technology (JST), 2018
This paper presents a mathematical model of the traditional musical instrument, the kompang. In t... more This paper presents a mathematical model of the traditional musical instrument, the kompang. In this study, a mathematical model of the kompang membrane is developed to simulate the vibration of the kompang membrane in polar coordinates by implementing the Fourier-Bessel wave function. The wave equation in polar direction is applied to provide the vibration modes of the membrane with the corresponding natural frequencies of the circular membrane. The initial and boundary conditions are determined to allow the development of numerical equation based on kompang membrane attachment. The mathematical model is coded in Smath for the numerical analysis as well as the plotting tool. Two kompang membrane cases with different membrane materials i.e. goat-skin and x-ray film are tried to test the model. The Finite Element Method (FEM) programme, Mecway, shows that the natural frequencies and the corresponding mode shapes are comparable with those from the developed model.
International Journal of Mechanical Engineering and Technology (IJMET), 2018
The aim of the research work was to investigate the position of sail and the additional notch on ... more The aim of the research work was to investigate the position of sail and the additional notch on tail of a mini submarine to reduce the force resistance. The tail position parameter was modelled as the ratio of the submarine the total length of the hull (L) to the sail distance (X), whereas the notch was represented by several notch designs. Computational Fluid Dynamic (CFD) simulation routines were conducted to examine the investigated two design parameters, i.e. sail position and notch configuration. Once the optimal model of the sail position was obtained, the additional notches model were tried. The simulation results show that the best position of the sail is when the L/X ratio is 3 and the notch model is T1 (three go around notches) in standard HT05 airfoil. The selected configurations provide the optimized sail position and notch model for the designed mini submarine. .
Advanced Materials Research, Sep 1, 2013
ABSTRACT Numerical simulation by finite element method has become a powerful tool in predicting a... more ABSTRACT Numerical simulation by finite element method has become a powerful tool in predicting and preventing the unwanted effects of sheet metals technological processing. One of the most important problems in sheet metal forming is the compensation of springback. To improve the accuracy of the formed parts, the die surfaces are required to be optimized so that after springback the geometry falls at the expected shape. This paper presents and discusses numerical simulation procedure of die compensation by using the methods of Simplified Displacement adjustment (SDA). This analysis use Benchmark 3 models of Numisheet 2011. Sensitively analysis was done by using finite element method (FEM) show that the springback values are influenced by element size, integration points and material properties.
Titanium alloys are commonly used in the application of biomechanics parts. One of the applicatio... more Titanium alloys are commonly used in the application of biomechanics parts. One of the applications for hip joint prostheses. When wearing is one parameter that mostly considered, the Titanium alloy is much more superior compared to that from polyethylene derivatives. Although the wear of existing Ti-6Al-4V Titanium Alloy on Ti-6Al-4V Titanium Alloy hip joint prostheses is much lower than the more widely used polyethylene on metal bearings, there are some concerns about the toxicity of Al and V wear debris in the human body that might negative side effects to the human body. For this reason, the use of pure Titanium is a potential metal and safer to replace Ti-6Al-4V Titanium Alloy bearings. An investigation has been conducted to see the effect of femoral head size to Contact Stress at Pure Titanium Femoral Ball Head Outer Surface of Hip Joint Implant. The radius of femoral heads are 27 mm, 28 mm, and 30 mm. Numerical analysis based on Finite Element Method is used to simulate and c...
(244 pages, RM39 or USD 13 excluded postage, contact: ahyar@uthm.edu.my) This book will guide you... more (244 pages, RM39 or USD 13 excluded postage, contact: ahyar@uthm.edu.my) This book will guide you to use LyX which has a powerful LaTeX in the background. The example is this book itself. You just need to follow the Seven Steps, starting from Understanding LyX Environment, Document Preparation, Writing the Frontmatter, Writing the Mainmatter, Writing the Backmatter, Working with LaTeX Packages, and Printing the Manuscript. All scientific aspects of writing, such as Images, Tables, Mathematical Equations, BibTex database, and Index Preparation are all discussed in detail.
Electronic devices that will be installed for automotive applications would possibly located in e... more Electronic devices that will be installed for automotive applications would possibly located in environments where vibrations environment might occur. It is therefore necessary to provide a vibration or shock test for a functionally test under severe vibration environments. A general purpose vibration test system has been developed to provide a testing platform for such testing requirements. A special shaker table has been designed and manufactured to be a platform base where an electronic device will be placed and excited by a vibration exciter. This shaker stable can be used in a frequency range of service up to 2500 Hz and will behave as a rigid body vibration. The vibration excitations from the shaker will be directly transmitted to the electronic device in a rigid body mode. The calculated first natural frequency of the shaker table is 2580 Hz. The resonance will not occur in the range of frequency of service (0-2500Hz). The vibration system can provide various tests: random te...
International Journal of Mathematical Models and Methods in Applied Sciences
Kinematics behavior of an eccentric reciprocating slider mechanism depends on its geometrical dim... more Kinematics behavior of an eccentric reciprocating slider mechanism depends on its geometrical dimensions. When a shock effect at the slider point is intended for a particular purpose such as in compactor application, an eccentricity of the slider's axis is required. The kinematics evaluation of the slider considers velocity and acceleration functions at the slider point. This paper provides kinematics sensitivity functions at the slider point based on vector analysis of the eccentric slider mechanism. The functions have three design variables: eccentricity, length of connecting rod and the radius of crank rotation with an additional rotational variable for plotting purpose. The sensitivity functions are coded in SMath to do all calculations and graphical plotting. Validation results show that the functions calculate correctly of known example problems. For a test case, the kinematics sensitivity functions are employed to obtain a feasible optimum design of eccentricity value to ...
Applied Mechanics and Materials, 2015
ABSTRACT This paper discusses a finite element analysis of cylinder on flat contact configuration... more ABSTRACT This paper discusses a finite element analysis of cylinder on flat contact configuration subjected to constant normal load and reciprocating tangential displacement with linear kinematic hardening models based on bi-modal Ti-6Al-4V cyclic stress-strain curves. The predicted evolution of plastic deformation such as the equivalent plastic strain, tangential plastic strain and shear plastic strain distributions on the contact region has been studied along with its respective predicted stress distributions. The effect of applied forward and backward sliding displacement movements on predicted stress and strain distributions have also been looked at. It is found that the stress distributions predicted for kinematic hardening model is similar for forward and backward movements while the predicted plastic strain distribution is increasing with reciprocating sliding movement. The predicted value keep increasing when it moves forward, backward and finally moves forward again. This is due to large strain effect of the model and its dependant on the displacement movement amount.
36th International Electronics Manufacturing Technology Conference, 2014
Journal of Mechanical Science and Technology, 2015
International Review on Modelling and Simulations (IREMOS), 2014
The aim of this work is to see the structural behavior of ballasted small rail track system under... more The aim of this work is to see the structural behavior of ballasted small rail track system under static moving and dynamic loads. The ballasted rail track system is firstly modeled by solid hexahedral and tetrahedral finite elements representing the rails, sleepers and the ballast. Three simulations are then conducted in LISA; moving static loading, modal vibration and dynamic loading. Four locations are selected to simulate the moving static loading. The longitudinal displacement of the rails and the ballast can be captured on these four locations. The simulation results show that the ballast displaces more at locations where the sleepers are attached. The fluctuations depend on the moving wheels. The first two vibration modes are the cross swaying of the rails followed by two vertical motions and the fifth mode is the longitudinal motion. The velocity and acceleration responses show similar pattern with that static displacement response. In future research, the results can be use...
ABSTRACT Commercially pure (cp) titanium has a relative soft hardness property. In particular usa... more ABSTRACT Commercially pure (cp) titanium has a relative soft hardness property. In particular usage such as sliding, the improvement of the hardness value will be required. To improve the hardness of the surface while maintaining the original properties, ion implantation process is conducted. Nitrogen ions are used to implant this material. The effects of the nitrogen ion doses to the surface hardness are then studied. In this study, Ion Implantation processes are conducted at room temperature and process durations are varied as 140 minutes, 280 minutes and 560 minutes. The doses of nitrogen ions which is required in these process durations are 8.4x1014 ions/cm2, 16.8x1014 ions/cm2, and 33.6x1014 ions/cm2 respectively. Hardness tests are then performed on each specimen by using Micro Vickers Hardness Tester. The processes of ion implantation produce the hardness surface values of 88.97 HV, 125.51 HV, and 130.2 HV, for the doses of 8.4x1014 ions/cm2, 16.8x1014 ions/cm2, and 33.6x1014 ions/cm2. The ion implantation of cp titanium can significantly increase the hardness on the surface. Compared to the hardness of the raw material, these processes have increased the hardness values by 64.8 %, 132.5%, and 141.2 % for the doses of 8.4x1014 ions/cm2, 16.8x1014 ions/cm2, and 33.6x1014 ions/cm2 respectively. The hardness can be improved as high as 41.07 % when the dose is increased from 8.4x1014 ions/cm2 to 16.8x1014 ions/cm2. However there is no a significant increasing in hardness value when the dose is increased from 16.8x1014 ions/cm2 to 33.6x1014 ions/cm2.
ABSTRACT In the automotive and aerospace industries, the need for lightweight products is absolut... more ABSTRACT In the automotive and aerospace industries, the need for lightweight products is absolutely necessary. By combining between the strength and lightweight material usingTailor Welded Blank(TWB), the need can be achieved.Aluminium has the tendency to flow more than steel due to the lower density and weaker.Independence blank holder allows the application of different force on steel and aluminium in the forming process.The blank sheet flow can be controlled by different blank holder force (BHF).The promising materials are Steel and Aluminium alloy thatare formed into single blank sheet.The purpose of this numerical study is to demonstrate that dissimilar strength Steel-Al TWB can be subjected to deep drawing operations successfully, using optimum process parameters in the Finite Element (FE) simulation.The simulation indicate that Steel-Al TWB can produce deep drawing components.
ABSTRACT The present study is concerns about numerical analysis on failure process of deformable ... more ABSTRACT The present study is concerns about numerical analysis on failure process of deformable aluminium target plate perforated by rigid ogival projectile nose shape. The perforation process has been simulated by the application of 3D analysis using IMPACT dynamic FE program suite. The comparison on failure modes by ogival projectile nose shape have been studied and evaluated. The study covered different failure modes including perforation, petalling and holes expansion of perforated aluminium sheet according to different level of impact velocities. A wide range of impact velocities from 100 m/s to 600 m/s has been covered in the tests. The projectile has the diameter of 22 mm and the aluminium circular sheet has the diameter of 50 mm. Different failure modes for each case was found. For the velocity impact of 100 m/s dishing and petalling formation observed while for higher impact velocity (≥ 300 m/s) extensive petal formation modes of failure generated. Good agreement is obtained between simulation using IMPACT explicit and ABAQUS explicit finite element code analysis.
International Journal of Mechanical Engineering and Technology (IJMET), 2018
This paper presents the effect of humidity on the goat skin membrane of traditional musical instr... more This paper presents the effect of humidity on the goat skin membrane of traditional musical instrument kompang. Three kompang samples with similar size of 25 cm diameter were exposed to three different relative humidity (RH) conditions (50% RH, 70% RH and 90% RH) under the Climate Chamber. The tension and the vibration frequency were measured every 8 hours in anechoic enclosure. It is found that after 48 hours of humidity exposure, the tension of the membrane reduced by 6.2% for 50% RH, 13.1% for 70% RH and 21.5% for 90% RH. The frequency of the sound produced by the membrane also lowered by 4.6% for 50% RH, 18.7% for 70% RH and 26.4% for 90% RH. The goatskin membrane is sensitive to the humidity so that the sound changes to lower frequency as the humidity increases. The lowering frequency is due to the tension lost of the goatskin membrane.
International Journal of Mechanical Engineering and Technology (IJMET), 2018
This work is the development of boundary element method for elastoplastic plate analysis to inclu... more This work is the development of boundary element method for elastoplastic plate analysis to include elastic-linear hardening material. The plate is subjected to bending, in-plane and combined bending and in-plane. The plastic zone is evaluated by using von Mises criterion. The cell discretization is implemented to solve numerically the domain integral caused by plasticity. To evaluate the nonlinear term in the formulation of the boundary element, a total incremental technique is implemented. The capability of the development in this work will be presented by having numerical examples.
Pertanika Journal of Science & Technology (JST), 2018
This paper presents a mathematical model of the traditional musical instrument, the kompang. In t... more This paper presents a mathematical model of the traditional musical instrument, the kompang. In this study, a mathematical model of the kompang membrane is developed to simulate the vibration of the kompang membrane in polar coordinates by implementing the Fourier-Bessel wave function. The wave equation in polar direction is applied to provide the vibration modes of the membrane with the corresponding natural frequencies of the circular membrane. The initial and boundary conditions are determined to allow the development of numerical equation based on kompang membrane attachment. The mathematical model is coded in Smath for the numerical analysis as well as the plotting tool. Two kompang membrane cases with different membrane materials i.e. goat-skin and x-ray film are tried to test the model. The Finite Element Method (FEM) programme, Mecway, shows that the natural frequencies and the corresponding mode shapes are comparable with those from the developed model.
International Journal of Mechanical Engineering and Technology (IJMET), 2018
The aim of the research work was to investigate the position of sail and the additional notch on ... more The aim of the research work was to investigate the position of sail and the additional notch on tail of a mini submarine to reduce the force resistance. The tail position parameter was modelled as the ratio of the submarine the total length of the hull (L) to the sail distance (X), whereas the notch was represented by several notch designs. Computational Fluid Dynamic (CFD) simulation routines were conducted to examine the investigated two design parameters, i.e. sail position and notch configuration. Once the optimal model of the sail position was obtained, the additional notches model were tried. The simulation results show that the best position of the sail is when the L/X ratio is 3 and the notch model is T1 (three go around notches) in standard HT05 airfoil. The selected configurations provide the optimized sail position and notch model for the designed mini submarine. .
Advanced Materials Research, Sep 1, 2013
ABSTRACT Numerical simulation by finite element method has become a powerful tool in predicting a... more ABSTRACT Numerical simulation by finite element method has become a powerful tool in predicting and preventing the unwanted effects of sheet metals technological processing. One of the most important problems in sheet metal forming is the compensation of springback. To improve the accuracy of the formed parts, the die surfaces are required to be optimized so that after springback the geometry falls at the expected shape. This paper presents and discusses numerical simulation procedure of die compensation by using the methods of Simplified Displacement adjustment (SDA). This analysis use Benchmark 3 models of Numisheet 2011. Sensitively analysis was done by using finite element method (FEM) show that the springback values are influenced by element size, integration points and material properties.
Titanium alloys are commonly used in the application of biomechanics parts. One of the applicatio... more Titanium alloys are commonly used in the application of biomechanics parts. One of the applications for hip joint prostheses. When wearing is one parameter that mostly considered, the Titanium alloy is much more superior compared to that from polyethylene derivatives. Although the wear of existing Ti-6Al-4V Titanium Alloy on Ti-6Al-4V Titanium Alloy hip joint prostheses is much lower than the more widely used polyethylene on metal bearings, there are some concerns about the toxicity of Al and V wear debris in the human body that might negative side effects to the human body. For this reason, the use of pure Titanium is a potential metal and safer to replace Ti-6Al-4V Titanium Alloy bearings. An investigation has been conducted to see the effect of femoral head size to Contact Stress at Pure Titanium Femoral Ball Head Outer Surface of Hip Joint Implant. The radius of femoral heads are 27 mm, 28 mm, and 30 mm. Numerical analysis based on Finite Element Method is used to simulate and c...
(244 pages, RM39 or USD 13 excluded postage, contact: ahyar@uthm.edu.my) This book will guide you... more (244 pages, RM39 or USD 13 excluded postage, contact: ahyar@uthm.edu.my) This book will guide you to use LyX which has a powerful LaTeX in the background. The example is this book itself. You just need to follow the Seven Steps, starting from Understanding LyX Environment, Document Preparation, Writing the Frontmatter, Writing the Mainmatter, Writing the Backmatter, Working with LaTeX Packages, and Printing the Manuscript. All scientific aspects of writing, such as Images, Tables, Mathematical Equations, BibTex database, and Index Preparation are all discussed in detail.
Electronic devices that will be installed for automotive applications would possibly located in e... more Electronic devices that will be installed for automotive applications would possibly located in environments where vibrations environment might occur. It is therefore necessary to provide a vibration or shock test for a functionally test under severe vibration environments. A general purpose vibration test system has been developed to provide a testing platform for such testing requirements. A special shaker table has been designed and manufactured to be a platform base where an electronic device will be placed and excited by a vibration exciter. This shaker stable can be used in a frequency range of service up to 2500 Hz and will behave as a rigid body vibration. The vibration excitations from the shaker will be directly transmitted to the electronic device in a rigid body mode. The calculated first natural frequency of the shaker table is 2580 Hz. The resonance will not occur in the range of frequency of service (0-2500Hz). The vibration system can provide various tests: random te...
International Journal of Mathematical Models and Methods in Applied Sciences
Kinematics behavior of an eccentric reciprocating slider mechanism depends on its geometrical dim... more Kinematics behavior of an eccentric reciprocating slider mechanism depends on its geometrical dimensions. When a shock effect at the slider point is intended for a particular purpose such as in compactor application, an eccentricity of the slider's axis is required. The kinematics evaluation of the slider considers velocity and acceleration functions at the slider point. This paper provides kinematics sensitivity functions at the slider point based on vector analysis of the eccentric slider mechanism. The functions have three design variables: eccentricity, length of connecting rod and the radius of crank rotation with an additional rotational variable for plotting purpose. The sensitivity functions are coded in SMath to do all calculations and graphical plotting. Validation results show that the functions calculate correctly of known example problems. For a test case, the kinematics sensitivity functions are employed to obtain a feasible optimum design of eccentricity value to ...
Applied Mechanics and Materials, 2015
ABSTRACT This paper discusses a finite element analysis of cylinder on flat contact configuration... more ABSTRACT This paper discusses a finite element analysis of cylinder on flat contact configuration subjected to constant normal load and reciprocating tangential displacement with linear kinematic hardening models based on bi-modal Ti-6Al-4V cyclic stress-strain curves. The predicted evolution of plastic deformation such as the equivalent plastic strain, tangential plastic strain and shear plastic strain distributions on the contact region has been studied along with its respective predicted stress distributions. The effect of applied forward and backward sliding displacement movements on predicted stress and strain distributions have also been looked at. It is found that the stress distributions predicted for kinematic hardening model is similar for forward and backward movements while the predicted plastic strain distribution is increasing with reciprocating sliding movement. The predicted value keep increasing when it moves forward, backward and finally moves forward again. This is due to large strain effect of the model and its dependant on the displacement movement amount.
36th International Electronics Manufacturing Technology Conference, 2014
Journal of Mechanical Science and Technology, 2015
International Review on Modelling and Simulations (IREMOS), 2014
The aim of this work is to see the structural behavior of ballasted small rail track system under... more The aim of this work is to see the structural behavior of ballasted small rail track system under static moving and dynamic loads. The ballasted rail track system is firstly modeled by solid hexahedral and tetrahedral finite elements representing the rails, sleepers and the ballast. Three simulations are then conducted in LISA; moving static loading, modal vibration and dynamic loading. Four locations are selected to simulate the moving static loading. The longitudinal displacement of the rails and the ballast can be captured on these four locations. The simulation results show that the ballast displaces more at locations where the sleepers are attached. The fluctuations depend on the moving wheels. The first two vibration modes are the cross swaying of the rails followed by two vertical motions and the fifth mode is the longitudinal motion. The velocity and acceleration responses show similar pattern with that static displacement response. In future research, the results can be use...
ABSTRACT Commercially pure (cp) titanium has a relative soft hardness property. In particular usa... more ABSTRACT Commercially pure (cp) titanium has a relative soft hardness property. In particular usage such as sliding, the improvement of the hardness value will be required. To improve the hardness of the surface while maintaining the original properties, ion implantation process is conducted. Nitrogen ions are used to implant this material. The effects of the nitrogen ion doses to the surface hardness are then studied. In this study, Ion Implantation processes are conducted at room temperature and process durations are varied as 140 minutes, 280 minutes and 560 minutes. The doses of nitrogen ions which is required in these process durations are 8.4x1014 ions/cm2, 16.8x1014 ions/cm2, and 33.6x1014 ions/cm2 respectively. Hardness tests are then performed on each specimen by using Micro Vickers Hardness Tester. The processes of ion implantation produce the hardness surface values of 88.97 HV, 125.51 HV, and 130.2 HV, for the doses of 8.4x1014 ions/cm2, 16.8x1014 ions/cm2, and 33.6x1014 ions/cm2. The ion implantation of cp titanium can significantly increase the hardness on the surface. Compared to the hardness of the raw material, these processes have increased the hardness values by 64.8 %, 132.5%, and 141.2 % for the doses of 8.4x1014 ions/cm2, 16.8x1014 ions/cm2, and 33.6x1014 ions/cm2 respectively. The hardness can be improved as high as 41.07 % when the dose is increased from 8.4x1014 ions/cm2 to 16.8x1014 ions/cm2. However there is no a significant increasing in hardness value when the dose is increased from 16.8x1014 ions/cm2 to 33.6x1014 ions/cm2.
ABSTRACT In the automotive and aerospace industries, the need for lightweight products is absolut... more ABSTRACT In the automotive and aerospace industries, the need for lightweight products is absolutely necessary. By combining between the strength and lightweight material usingTailor Welded Blank(TWB), the need can be achieved.Aluminium has the tendency to flow more than steel due to the lower density and weaker.Independence blank holder allows the application of different force on steel and aluminium in the forming process.The blank sheet flow can be controlled by different blank holder force (BHF).The promising materials are Steel and Aluminium alloy thatare formed into single blank sheet.The purpose of this numerical study is to demonstrate that dissimilar strength Steel-Al TWB can be subjected to deep drawing operations successfully, using optimum process parameters in the Finite Element (FE) simulation.The simulation indicate that Steel-Al TWB can produce deep drawing components.
ABSTRACT The present study is concerns about numerical analysis on failure process of deformable ... more ABSTRACT The present study is concerns about numerical analysis on failure process of deformable aluminium target plate perforated by rigid ogival projectile nose shape. The perforation process has been simulated by the application of 3D analysis using IMPACT dynamic FE program suite. The comparison on failure modes by ogival projectile nose shape have been studied and evaluated. The study covered different failure modes including perforation, petalling and holes expansion of perforated aluminium sheet according to different level of impact velocities. A wide range of impact velocities from 100 m/s to 600 m/s has been covered in the tests. The projectile has the diameter of 22 mm and the aluminium circular sheet has the diameter of 50 mm. Different failure modes for each case was found. For the velocity impact of 100 m/s dishing and petalling formation observed while for higher impact velocity (≥ 300 m/s) extensive petal formation modes of failure generated. Good agreement is obtained between simulation using IMPACT explicit and ABAQUS explicit finite element code analysis.