Qian Cong, Xiaojie Shi, Yu Xiong, Ju Wang, Zhen Yang, W. Tian
A novel bionic gripper with bristles is designed based on the biological structure of the front tarsi of scutigers, and its simulation model is established. It was verified that the proposed bionic gripper not only achieved the expected gripping action but also completed the pinching motion with better grasping performance. Related parameters, such as displacement, velocity, acceleration, force, and torque, were also analyzed. Friction contact finite element analysis of the bionic gripper with bristle structure was performed using ABAQUS and compared with the control group. The finite element analysis results showed that the bristles could effectively improve the capture efficiency of the bionic gripper. The diameter and density of the bristles in the bionic gripper were optimized, and their influence on the gripping efficiency was analyzed. This study provides a reference for the structural design of bionic grippers and the practical application of bionic non-smooth surfaces.
{"title":"A novel bionic gripper based on the front tarsi of scutigers","authors":"Qian Cong, Xiaojie Shi, Yu Xiong, Ju Wang, Zhen Yang, W. Tian","doi":"10.1139/tcsme-2021-0152","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0152","url":null,"abstract":"A novel bionic gripper with bristles is designed based on the biological structure of the front tarsi of scutigers, and its simulation model is established. It was verified that the proposed bionic gripper not only achieved the expected gripping action but also completed the pinching motion with better grasping performance. Related parameters, such as displacement, velocity, acceleration, force, and torque, were also analyzed. Friction contact finite element analysis of the bionic gripper with bristle structure was performed using ABAQUS and compared with the control group. The finite element analysis results showed that the bristles could effectively improve the capture efficiency of the bionic gripper. The diameter and density of the bristles in the bionic gripper were optimized, and their influence on the gripping efficiency was analyzed. This study provides a reference for the structural design of bionic grippers and the practical application of bionic non-smooth surfaces.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43306156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. M. Battina, C. Hari Krishna, Varaha Siva Prasad Vanthala
In sheet metal forming processes, the forming limit diagram is frequently employed as a criterion for predicting necking initiation. This is one of the most useful and effective methods for the evaluation of the formability of tailor welded blanks. The goal of this study was to determine the formability of friction stir welded (FSW) AA6061-T6 and AA2017-T6 by employing five dissimilar tool pin profiles. To evaluate the limiting dome height, five different combinations of dissimilar blanks were used in experimental and simulation experiments. Material characteristics such as density, elastic modulus, and all multi-linear behavior of blanks were manually assigned for simulation from the test results of true stress vs true strain plots. The punch with die supports was considered as a rigid body, whereas the metallic blanks were considered as plastic material. To carry out the simulation, the entire blank was divided into three zones. The results obtained from the experimental and simulation results show that the straight square tool pin profile is the optimal tool pin profile for the formability of FSW AA6061-T6 and AA2017-T6. The tested height values obtained from the limiting dome height are 20.5mm and 20.9 mm in experimentation and simulation respectively. The straight cylindrical tool pin profile exhibited the worst formability properties in both experimentation and simulation.
{"title":"Influence of pin profile on formability of friction stir welded aluminium tailor welded blanks: an experimental and finite element simulation analysis","authors":"N. M. Battina, C. Hari Krishna, Varaha Siva Prasad Vanthala","doi":"10.1139/tcsme-2022-0031","DOIUrl":"https://doi.org/10.1139/tcsme-2022-0031","url":null,"abstract":"In sheet metal forming processes, the forming limit diagram is frequently employed as a criterion for predicting necking initiation. This is one of the most useful and effective methods for the evaluation of the formability of tailor welded blanks. The goal of this study was to determine the formability of friction stir welded (FSW) AA6061-T6 and AA2017-T6 by employing five dissimilar tool pin profiles. To evaluate the limiting dome height, five different combinations of dissimilar blanks were used in experimental and simulation experiments. Material characteristics such as density, elastic modulus, and all multi-linear behavior of blanks were manually assigned for simulation from the test results of true stress vs true strain plots. The punch with die supports was considered as a rigid body, whereas the metallic blanks were considered as plastic material. To carry out the simulation, the entire blank was divided into three zones. The results obtained from the experimental and simulation results show that the straight square tool pin profile is the optimal tool pin profile for the formability of FSW AA6061-T6 and AA2017-T6. The tested height values obtained from the limiting dome height are 20.5mm and 20.9 mm in experimentation and simulation respectively. The straight cylindrical tool pin profile exhibited the worst formability properties in both experimentation and simulation.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45499010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Water droplet erosion (WDE) has received considerable attention in recent years. Different approaches have been proposed to understand WDE and find lasting solutions. Among them is understanding the interaction between the droplet impacts and the target surface especially at the erosion initiation stage. For this reason, this work studies the interactions between water droplets and different surface features to understand WDE. These surface features include flat smooth surface, grooved and porous samples. For the grooved samples, 1 mm and 0.5 mm depth are studied and their water droplet (WDE) erosion performance is evaluated. The 0.5 mm groove shows a longer incubation period than the flat reference sample. This work suggests that thin water film is formed in the groove which aids in dampening the impacts of subsequent water droplets. However, the maximum erosion rate is not affected by introducing these grooves. WDE performance of the porous samples is better than that of the solid material. This is because the porous structure dissipates the impact energy of the water droplets. Simulation results are in agreement with the experimental observations in this work. Furthermore, the simulation showed that the water droplet impacting patterns on different surface features are attributed to the effect of radial and axial airflows.
{"title":"Experimental and CFD simulation of water droplets interactions with different surface features to understand water droplet erosion","authors":"Ming Jing, A. K. Gujba, M. Medraj","doi":"10.1139/tcsme-2021-0168","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0168","url":null,"abstract":"Water droplet erosion (WDE) has received considerable attention in recent years. Different approaches have been proposed to understand WDE and find lasting solutions. Among them is understanding the interaction between the droplet impacts and the target surface especially at the erosion initiation stage. For this reason, this work studies the interactions between water droplets and different surface features to understand WDE. These surface features include flat smooth surface, grooved and porous samples. For the grooved samples, 1 mm and 0.5 mm depth are studied and their water droplet (WDE) erosion performance is evaluated. The 0.5 mm groove shows a longer incubation period than the flat reference sample. This work suggests that thin water film is formed in the groove which aids in dampening the impacts of subsequent water droplets. However, the maximum erosion rate is not affected by introducing these grooves. WDE performance of the porous samples is better than that of the solid material. This is because the porous structure dissipates the impact energy of the water droplets. Simulation results are in agreement with the experimental observations in this work. Furthermore, the simulation showed that the water droplet impacting patterns on different surface features are attributed to the effect of radial and axial airflows.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45131237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
U. Allauddin, W. Khan, Saim Ali, Syed Muhammad Bilal Haider, Abdul S. Ahmed, Abdur Rehman, P. G. Verdin
Solar air heaters convert clean solar energy into useful heat and have a wide range of applications. Computational Fluid Dynamics (CFD) can aid in the design and development of solar air heaters with optimized thermal efficiency. A detailed numerical study was conducted to investigate the fluid flow and heat transfer characteristics of a roughened solar air heater with novel V-shaped ribs having staggered elements. Three dimensional steady-state numerical simulations were performed using the k– RNG turbulence model, and results were found in excellent agreement with experimental data. The effect of ribs spacing were studied through varying the rib pitch to rib height ratio P/e= 6 to 14, for Reynolds numbers (Re) in the range of 4000-14,000. A significant enhancement in the ribs-roughened solar air heater’s thermal performance was observed. It was also established that an increment in P/e from 6 to 10 increases the Nusselt number (Nu) for all Re values investigated. About 72.6% Nu enhancement was predicted for P/e=10 at Re = 12,000. It was further observed that an increment in p/e from 10 to 14 decreases Nu for all Re values considered.
{"title":"Numerical Investigation of Fluid Flow and Heat Characteristics of a Roughened Solar Air Heater with Novel V-shaped Ribs","authors":"U. Allauddin, W. Khan, Saim Ali, Syed Muhammad Bilal Haider, Abdul S. Ahmed, Abdur Rehman, P. G. Verdin","doi":"10.1139/tcsme-2021-0205","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0205","url":null,"abstract":"Solar air heaters convert clean solar energy into useful heat and have a wide range of applications. Computational Fluid Dynamics (CFD) can aid in the design and development of solar air heaters with optimized thermal efficiency. A detailed numerical study was conducted to investigate the fluid flow and heat transfer characteristics of a roughened solar air heater with novel V-shaped ribs having staggered elements. Three dimensional steady-state numerical simulations were performed using the k– RNG turbulence model, and results were found in excellent agreement with experimental data. The effect of ribs spacing were studied through varying the rib pitch to rib height ratio P/e= 6 to 14, for Reynolds numbers (Re) in the range of 4000-14,000. A significant enhancement in the ribs-roughened solar air heater’s thermal performance was observed. It was also established that an increment in P/e from 6 to 10 increases the Nusselt number (Nu) for all Re values investigated. About 72.6% Nu enhancement was predicted for P/e=10 at Re = 12,000. It was further observed that an increment in p/e from 10 to 14 decreases Nu for all Re values considered.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46867928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We used a locomotive and a rail car to examine the working principle of a locomotive braking system. We established models of the locomotive braking system, the locomotive dynamics, and the brake disc thermodynamics and, based on the correlation parameters for each subsystem, built an integrated simulation platform for the locomotive braking system based on Simulink and AMESim. Using this platform, we simulated the characteristics of the pneumatic braking unit, the locomotive braking, and temperature increase in the brake disc under emergency braking conditions. We compared our simulation results with experimental data and the results showed that the integrated simulation platform for the locomotive braking system could successfully be used to study locomotive braking control on the vehicle level. We provide a design optimization method for the development of a braking system, the setting of the anti-skid criterion, and early warning of an increase in the brake disc temperature.
{"title":"Integrated simulation platform for a locomotive braking system","authors":"Zhou Jiajun, Tian Chun, Wu Mengling","doi":"10.1139/tcsme-2020-0202","DOIUrl":"https://doi.org/10.1139/tcsme-2020-0202","url":null,"abstract":"We used a locomotive and a rail car to examine the working principle of a locomotive braking system. We established models of the locomotive braking system, the locomotive dynamics, and the brake disc thermodynamics and, based on the correlation parameters for each subsystem, built an integrated simulation platform for the locomotive braking system based on Simulink and AMESim. Using this platform, we simulated the characteristics of the pneumatic braking unit, the locomotive braking, and temperature increase in the brake disc under emergency braking conditions. We compared our simulation results with experimental data and the results showed that the integrated simulation platform for the locomotive braking system could successfully be used to study locomotive braking control on the vehicle level. We provide a design optimization method for the development of a braking system, the setting of the anti-skid criterion, and early warning of an increase in the brake disc temperature.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47435674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Temperature rise has an essential effect on the performance and service life of the permanent magnet in-wheel motor (PMIWM) in traction system of electric vehicle (EV) under complex operating conditions. Bi-directional electromagnetic-thermal coupling method is proposed to analyze the electromagnetic loss and thermal characteristics of the PMIWM considering the influence of temperature rise on the permanent magnetic material. The heat dissipation coefficient and electromagnetic-thermal coupling field model of each component of the PMIWM is analyzed. The distribution of electromagnetic loss and thermal of the PMIWM is investigated under constant speed, constant torque and variable speed and variable torque conditions. A 8kW outer rotor PMIWM is employed to study the electromagnetic-thermal coupling characteristics. Simulations and experimental results show that the thermal field of each component of the PMIWM calculated by the proposed bi-directional electromagnetic-thermal coupling method is more accurate than that of the traditional uni-directional electromagnetic-thermal coupling method under complex operating conditions. The effectiveness of the proposed bi-directional electromagnetic-thermal coupling method provides solid supports for the cooling design of the PMIWM under harsh operating environment.
{"title":"Bi-directional Electromagnetic-Thermal Coupling Analysis For Permanent Magnet Traction Motor Under Complex Operating Conditions","authors":"Yong Li, Cheng Zhang, Xingyuan Xu","doi":"10.1139/tcsme-2022-0010","DOIUrl":"https://doi.org/10.1139/tcsme-2022-0010","url":null,"abstract":"Temperature rise has an essential effect on the performance and service life of the permanent magnet in-wheel motor (PMIWM) in traction system of electric vehicle (EV) under complex operating conditions. Bi-directional electromagnetic-thermal coupling method is proposed to analyze the electromagnetic loss and thermal characteristics of the PMIWM considering the influence of temperature rise on the permanent magnetic material. The heat dissipation coefficient and electromagnetic-thermal coupling field model of each component of the PMIWM is analyzed. The distribution of electromagnetic loss and thermal of the PMIWM is investigated under constant speed, constant torque and variable speed and variable torque conditions. A 8kW outer rotor PMIWM is employed to study the electromagnetic-thermal coupling characteristics. Simulations and experimental results show that the thermal field of each component of the PMIWM calculated by the proposed bi-directional electromagnetic-thermal coupling method is more accurate than that of the traditional uni-directional electromagnetic-thermal coupling method under complex operating conditions. The effectiveness of the proposed bi-directional electromagnetic-thermal coupling method provides solid supports for the cooling design of the PMIWM under harsh operating environment.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47850799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. E. Abram, Adrian Wikarna, F. Golnaraghi, G. Wang
160 oblique impact tests were performed to study the relationship between the kinematic response of a helmeted headform and impact severity caused by the change of speed (Group 1) and anvil angle (Group 2). For this work, the kinematic response of a helmeted headform is evaluated by measuring linear acceleration, rotational acceleration, and rotational velocity of the headform. In Group 1, a football helmet was tested at 45o anvil angle at four different impact speeds ranging from 4.5m/s and 7.4m/s on five impact locations. Results showed that for all cases, the relationship between impact speed and helmeted headform kinematic response was linear, with an average R2 value of 0.98. In Group 2, the helmeted headform was tested at 5.5m/s impact speed at six different anvil angles between 15o and 55o, and the response was fitted with a second-degree polynomial (curve) with an average R2 value of 0.96. The predicted helmeted headform kinematic response was obtained and validated experimentally, and the average error was found to be 8.3%. The results showed that it is possible to predict the kinematic response of a helmeted headform by interpolating or extrapolating the data without having to perform extra impact test.
{"title":"Predicting the Kinematic Response of a Helmeted Headform during Oblique Impacts","authors":"D. E. Abram, Adrian Wikarna, F. Golnaraghi, G. Wang","doi":"10.1139/tcsme-2021-0119","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0119","url":null,"abstract":"160 oblique impact tests were performed to study the relationship between the kinematic response of a helmeted headform and impact severity caused by the change of speed (Group 1) and anvil angle (Group 2). For this work, the kinematic response of a helmeted headform is evaluated by measuring linear acceleration, rotational acceleration, and rotational velocity of the headform. In Group 1, a football helmet was tested at 45o anvil angle at four different impact speeds ranging from 4.5m/s and 7.4m/s on five impact locations. Results showed that for all cases, the relationship between impact speed and helmeted headform kinematic response was linear, with an average R2 value of 0.98. In Group 2, the helmeted headform was tested at 5.5m/s impact speed at six different anvil angles between 15o and 55o, and the response was fitted with a second-degree polynomial (curve) with an average R2 value of 0.96. The predicted helmeted headform kinematic response was obtained and validated experimentally, and the average error was found to be 8.3%. The results showed that it is possible to predict the kinematic response of a helmeted headform by interpolating or extrapolating the data without having to perform extra impact test.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42323233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Cubli is a cube that can balance on its edge or corner by rotating inertia wheels. It is a typical underactuated mechanical system, and has 6 degrees of freedom when balancing on its corner. In this paper, an adaptive robust control is presented to balance the uncertain Cubli system on its corner. The uncertainties are considered to be time-varying and bounded, but the bounds are unknown. We first established a dynamic model of the uncertain Cubli system, subject to the servo constraints. Next, we present the robust control with a leakage-type adaptive law. We used the Lyapunov theory to verify the stability of the control. Finally, the effectiveness of the control was verified through numerical simulation in MATLAB™.
{"title":"Adaptive robust control for the corner balancing Cubli system with uncertainties","authors":"K. Huang, Jiandong Li, Zicheng Zhu, Biao Yu","doi":"10.1139/tcsme-2021-0008","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0008","url":null,"abstract":"The Cubli is a cube that can balance on its edge or corner by rotating inertia wheels. It is a typical underactuated mechanical system, and has 6 degrees of freedom when balancing on its corner. In this paper, an adaptive robust control is presented to balance the uncertain Cubli system on its corner. The uncertainties are considered to be time-varying and bounded, but the bounds are unknown. We first established a dynamic model of the uncertain Cubli system, subject to the servo constraints. Next, we present the robust control with a leakage-type adaptive law. We used the Lyapunov theory to verify the stability of the control. Finally, the effectiveness of the control was verified through numerical simulation in MATLAB™.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44638309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Electric Discharge Machining (EDM) processes are extensively utilized in industries for cutting hard to machine materials and geometries that are complex which are not possible with conventional machining. In this research study, efforts are made to identify optimal process parameters of EDM during machining of AA6061-10%SiCp composite material. The novelty of the present work is copper electrode with different geometries such as circular, triangular and square are considered for machining along with input variables discharge current density (A), pulse on and off timing (Ton and Toff) which are varied through three values. The L27 (313) orthogonal array of Taguchi is used for experimental layout and responses measured are recast layer thickness (RCT), electrode tool wear rate (TWR) and material removal rate (MRR). Taguchi’s approach of signal-to-noise (S/N) ratio is integrated with principal component analysis (PCA) for multi-criteria optimization. Also, nature inspired cuckoo search (CS) and firefly algorithm (FA) is employed for identifying the optimal conditions and to predict the outputs for maximum MRR and minimum TWR and RCT. From S/N+PCA analysis the optimal conditions identified are: Circle (12A, 65µs, 2µs), Triangle (12A, 95µs, 6µs) and Square (12A, 65µs, 8µs) was obtained. In all the conditions, discharge current influences higher than the other inputs. Metallurgical examination conducted through micrographs on the machined surface clearly supports the predicted result.
{"title":"Multi-objective Optimization of Electric Discharge Machining of Al-SiCp Composite by Taguchi-PCA, Firefly and Cuckoo Search Algorithm","authors":"R. A., S. S","doi":"10.1139/tcsme-2021-0199","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0199","url":null,"abstract":"Electric Discharge Machining (EDM) processes are extensively utilized in industries for cutting hard to machine materials and geometries that are complex which are not possible with conventional machining. In this research study, efforts are made to identify optimal process parameters of EDM during machining of AA6061-10%SiCp composite material. The novelty of the present work is copper electrode with different geometries such as circular, triangular and square are considered for machining along with input variables discharge current density (A), pulse on and off timing (Ton and Toff) which are varied through three values. The L27 (313) orthogonal array of Taguchi is used for experimental layout and responses measured are recast layer thickness (RCT), electrode tool wear rate (TWR) and material removal rate (MRR). Taguchi’s approach of signal-to-noise (S/N) ratio is integrated with principal component analysis (PCA) for multi-criteria optimization. Also, nature inspired cuckoo search (CS) and firefly algorithm (FA) is employed for identifying the optimal conditions and to predict the outputs for maximum MRR and minimum TWR and RCT. From S/N+PCA analysis the optimal conditions identified are: Circle (12A, 65µs, 2µs), Triangle (12A, 95µs, 6µs) and Square (12A, 65µs, 8µs) was obtained. In all the conditions, discharge current influences higher than the other inputs. Metallurgical examination conducted through micrographs on the machined surface clearly supports the predicted result.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46801065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In-plane dynamic behaviors of the double arrowhead, re-entrant honeycomb, chiral, missing rip, and star-shaped auxetic cellular structures were investigated using finite element analyses. An analytical model available in the literature was employed to validate the proposed finite element models. The finite element model was used to investigate the energy absorption capacities of the auxetic cellular structures, in addition to the mean and peak dynamic crushing forces. The results indicated that the chiral auxetic structure not only absorbed the most energy but also exhibited the largest mean crushing force under the same dynamic crushing conditions. In contrast, re-entrant honeycomb structures absorb the least energy, owing to the smallest mean crushing forces among all the cellular structures. This study provides insights into the dynamic deformation behavior and energy absorption capabilities of various auxetic cellular structures.
{"title":"A comparative analysis of the in-plane energy absorption capacities of auxetic structures","authors":"M. Tatlıer","doi":"10.1139/tcsme-2021-0112","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0112","url":null,"abstract":"In-plane dynamic behaviors of the double arrowhead, re-entrant honeycomb, chiral, missing rip, and star-shaped auxetic cellular structures were investigated using finite element analyses. An analytical model available in the literature was employed to validate the proposed finite element models. The finite element model was used to investigate the energy absorption capacities of the auxetic cellular structures, in addition to the mean and peak dynamic crushing forces. The results indicated that the chiral auxetic structure not only absorbed the most energy but also exhibited the largest mean crushing force under the same dynamic crushing conditions. In contrast, re-entrant honeycomb structures absorb the least energy, owing to the smallest mean crushing forces among all the cellular structures. This study provides insights into the dynamic deformation behavior and energy absorption capabilities of various auxetic cellular structures.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44079129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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