Pub Date : 2012-08-09DOI: 10.5923/J.JMEA.20120204.02
C. Sander, T. Soworka, A. Albers
The development of a humanoid robot within the scope of the Collaborative Research Center 588 (SFB 588) has the objective of creating a machine that can cooperate with humans closely. For designers, computer scientists and me- chanical and electrical engineers this development area presents great challenges. In contrast to commercial industrial ro- bots - for which mechanical rigidity, precision, high velocities and accelerations are primary requirements - the key aspects here are prevention of hazards to users, a motion space that corresponds to that of human beings, and a lightweight design. In order to meet these requirements, the robot must have humanlike appearance, motion space, and dexterity. Additionally, its kinematics should be familiar to the user, and its motions predictable, so as to encourage inexperienced persons to inter- act with the machine. The human spine offers great flexibility and is loaded with the weight of at least the whole upper body. On this account the emulation of the human upper body movement describes one of the most advanced issues in hu- manoid robot design. For the next generation of the humanoid robot ARMAR, a new concept to achieve a better flexibility in the robot's upper body movement has been done. This new torso-joint offers high stiffness, better accuracy and simulta- neously reduces weight and construction volume. Spring elements are used to save energy and to support the engines. In this paper the new mechanical design and first calculated results, considering energy saving potential and stiffness, are de- scribed in detail.
{"title":"Design of a New Torso-Joint for the Humanoid Robot ARMAR","authors":"C. Sander, T. Soworka, A. Albers","doi":"10.5923/J.JMEA.20120204.02","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120204.02","url":null,"abstract":"The development of a humanoid robot within the scope of the Collaborative Research Center 588 (SFB 588) has the objective of creating a machine that can cooperate with humans closely. For designers, computer scientists and me- chanical and electrical engineers this development area presents great challenges. In contrast to commercial industrial ro- bots - for which mechanical rigidity, precision, high velocities and accelerations are primary requirements - the key aspects here are prevention of hazards to users, a motion space that corresponds to that of human beings, and a lightweight design. In order to meet these requirements, the robot must have humanlike appearance, motion space, and dexterity. Additionally, its kinematics should be familiar to the user, and its motions predictable, so as to encourage inexperienced persons to inter- act with the machine. The human spine offers great flexibility and is loaded with the weight of at least the whole upper body. On this account the emulation of the human upper body movement describes one of the most advanced issues in hu- manoid robot design. For the next generation of the humanoid robot ARMAR, a new concept to achieve a better flexibility in the robot's upper body movement has been done. This new torso-joint offers high stiffness, better accuracy and simulta- neously reduces weight and construction volume. Spring elements are used to save energy and to support the engines. In this paper the new mechanical design and first calculated results, considering energy saving potential and stiffness, are de- scribed in detail.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133314107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-08-09DOI: 10.5923/J.JMEA.20120204.03
H. Qiu, Y. Yue, Chao Lin, K. Cheng
The paper presents research on the improvements over an autonomous non-contact device with a vertical spindle for free form measurement which the authors developed previously. The fundamental ideas in the previous work include combining two displacement sensors with a servo motor, keeping the position of the sensor to directly measure the surface at the central value of the sensor's measuring range by controlling the motor rotation and performing scanning mo- tions with NC functions of a MC. The inspection is entirely independent of the NC apparatus of the MC. Taking into account both the measurement accuracy and efficiency, three major improvements have been made retaining the advantages of the device. These improvements include 1) introducing a new sensing method for reference position along a scanning line to separate the reference position detection from the contour profile measurement, 2) accepting an AC servo motor controlled by a speed rule to raise the capability of autonomous movement following the contour profile to be measured, and 3) adopting a new laser displacement detector to widen the applicable range for both the shape and material of the surface to be measured. To assess the performance of the improved device, verification experiments are carried out on a machining center with several samples made of different materials. The experiment results demonstrate the effectiveness of the improvements made on the device.
{"title":"An Improved Measuring Device for Autonomous Form Measurement of Free Form Surfaces on Machining Centers","authors":"H. Qiu, Y. Yue, Chao Lin, K. Cheng","doi":"10.5923/J.JMEA.20120204.03","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120204.03","url":null,"abstract":"The paper presents research on the improvements over an autonomous non-contact device with a vertical spindle for free form measurement which the authors developed previously. The fundamental ideas in the previous work include combining two displacement sensors with a servo motor, keeping the position of the sensor to directly measure the surface at the central value of the sensor's measuring range by controlling the motor rotation and performing scanning mo- tions with NC functions of a MC. The inspection is entirely independent of the NC apparatus of the MC. Taking into account both the measurement accuracy and efficiency, three major improvements have been made retaining the advantages of the device. These improvements include 1) introducing a new sensing method for reference position along a scanning line to separate the reference position detection from the contour profile measurement, 2) accepting an AC servo motor controlled by a speed rule to raise the capability of autonomous movement following the contour profile to be measured, and 3) adopting a new laser displacement detector to widen the applicable range for both the shape and material of the surface to be measured. To assess the performance of the improved device, verification experiments are carried out on a machining center with several samples made of different materials. The experiment results demonstrate the effectiveness of the improvements made on the device.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130938356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-08-09DOI: 10.5923/J.JMEA.20120204.01
T. Salau, O. Ajide
This study utilised optimum fractal disk dimension algorithms to characterize the evolved strange attractor (Poincare section) when adaptive time steps Runge-Kutta fourth and fifth order algorithms are employed to compute simultaneously multiple trajectories of a harmonically excited Duffing oscillator from very close initial conditions. The challenges of insufficient literature that explore chaos diagrams as visual aids in dynamics characterization strongly motivate this study. The object of this study is to enable visual comparison of the chaos diagrams in the excitation amplitude versus frequency plane. The chaos diagrams obtained at two different damp coefficient levels conforms generally in trend to literature results[1] and qualitatively the same for all algorithms. The chances of chaotic behaviour are higher for combined higher excitation frequencies and amplitudes in addition to smaller damp coefficient. Fourth and fifth order Runge-Kutta algorithms indicates respectively 62.3% and 53.3% probability of chaotic behaviour at 0.168 damp coefficient and respectively 77.9% and 78.9% at 0.0168 damp coefficient. The chaos diagrams obtained by fourth order algorithms is accepted to be more reliable than its fifth order counterpart, its utility as tool for searching possible regions of parameter space where chaotic behaviour/motion exist may require additional dynamic behaviour tests.
{"title":"Comparative Analysis of Numerically Computed Chaos Diagrams in Duffing Oscillator","authors":"T. Salau, O. Ajide","doi":"10.5923/J.JMEA.20120204.01","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120204.01","url":null,"abstract":"This study utilised optimum fractal disk dimension algorithms to characterize the evolved strange attractor (Poincare section) when adaptive time steps Runge-Kutta fourth and fifth order algorithms are employed to compute simultaneously multiple trajectories of a harmonically excited Duffing oscillator from very close initial conditions. The challenges of insufficient literature that explore chaos diagrams as visual aids in dynamics characterization strongly motivate this study. The object of this study is to enable visual comparison of the chaos diagrams in the excitation amplitude versus frequency plane. The chaos diagrams obtained at two different damp coefficient levels conforms generally in trend to literature results[1] and qualitatively the same for all algorithms. The chances of chaotic behaviour are higher for combined higher excitation frequencies and amplitudes in addition to smaller damp coefficient. Fourth and fifth order Runge-Kutta algorithms indicates respectively 62.3% and 53.3% probability of chaotic behaviour at 0.168 damp coefficient and respectively 77.9% and 78.9% at 0.0168 damp coefficient. The chaos diagrams obtained by fourth order algorithms is accepted to be more reliable than its fifth order counterpart, its utility as tool for searching possible regions of parameter space where chaotic behaviour/motion exist may require additional dynamic behaviour tests.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124586259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-08-09DOI: 10.5923/J.JMEA.20120204.04
H. Mohanty, M. Mahapatra, Pradeep Kumar, N. Mandal
The weld properties of friction stir welding remains as an area of interest with respect to the effect of tool geometry and process parameters. In the present investigation effort has been made to understand the effect of important welding parameters such as tool rotational speed, traverse speed and probe geometries on various mechanical properties of AA1100 aluminium alloys. Ultimate tensile strength, percentage of elongation and hardness were determined experimentally for this purpose. Analysis of variance (ANOVA) was used to observe the main effect of above mentioned parameters on mechanical properties. A regression relationships were developed to predict each output. The experimental and predicted values from the mathematical model were in close agreement.
{"title":"Modeling the Effects of Tool Probe Geometries and Process Parameters on Friction Stirred Aluminium Welds","authors":"H. Mohanty, M. Mahapatra, Pradeep Kumar, N. Mandal","doi":"10.5923/J.JMEA.20120204.04","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120204.04","url":null,"abstract":"The weld properties of friction stir welding remains as an area of interest with respect to the effect of tool geometry and process parameters. In the present investigation effort has been made to understand the effect of important welding parameters such as tool rotational speed, traverse speed and probe geometries on various mechanical properties of AA1100 aluminium alloys. Ultimate tensile strength, percentage of elongation and hardness were determined experimentally for this purpose. Analysis of variance (ANOVA) was used to observe the main effect of above mentioned parameters on mechanical properties. A regression relationships were developed to predict each output. The experimental and predicted values from the mathematical model were in close agreement.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"7 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115736656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-08-09DOI: 10.5923/J.JMEA.20120204.05
G. G. Muscolo, C. Recchiuto, K. Hashimoto, P. Dario, A. Takanishi
In this paper the humanoid robot SABIAN (Sant'Anna BIpedal humANo id) is presented and analyzed in details. In particular, the differences between the SABIAN plat form and the WABIAN-2 (WAseda BIpedal humANo id), its original Japanese version, are underlined. So me innovative solutions, as the exact calcu lation of the error mass and the adoption of a new shaft with incorporated joint used to transfer motion, allowed to improve the performances of the robot. Other works, such as the development of a harvesting system for recovering energy, are planned for the next future in order to optimize the platform.
{"title":"Towards an Improvement of the SABIAN Humanoid Robot: from Design to Optimization","authors":"G. G. Muscolo, C. Recchiuto, K. Hashimoto, P. Dario, A. Takanishi","doi":"10.5923/J.JMEA.20120204.05","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120204.05","url":null,"abstract":"In this paper the humanoid robot SABIAN (Sant'Anna BIpedal humANo id) is presented and analyzed in details. In particular, the differences between the SABIAN plat form and the WABIAN-2 (WAseda BIpedal humANo id), its original Japanese version, are underlined. So me innovative solutions, as the exact calcu lation of the error mass and the adoption of a new shaft with incorporated joint used to transfer motion, allowed to improve the performances of the robot. Other works, such as the development of a harvesting system for recovering energy, are planned for the next future in order to optimize the platform.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121723416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-09DOI: 10.5923/J.JMEA.20120203.01
J. Leon, V. Jayakumar
Gait analyses are the preliminary requirements to establish a navigation system of a humanoid robot. Designing a suitable indoor environment and its mapping are also important for the android localization, selection of a goal to achieve it and to perform the assigned tasks in its surroundings. This paper delineates the various gaits like walking, turning, obstacle overcoming and step up-down stairs for a humanoid system. The writing also explicates the design of the indoor test environment with the stationary obstacles placed on the navigation routes. The development of an efficient algorithm is also excogitated based on the various analyses of gaits and the predefined map of the test environment. As the navigation map is predetermined, the designed algorithm animates the humanoid to navigate by selecting an optimal route, depending on some external commands, to reach at the goal position. Finally the performance of the system is analysed based on the elapsed time of the navigation action with the validation of optimal navigation strategy where the designed algorithm demonstrates the robustness of its implementation and execution.
{"title":"Designing an Algorithm for Bioloid Humanoid Navigating in its Indoor Environment","authors":"J. Leon, V. Jayakumar","doi":"10.5923/J.JMEA.20120203.01","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120203.01","url":null,"abstract":"Gait analyses are the preliminary requirements to establish a navigation system of a humanoid robot. Designing a suitable indoor environment and its mapping are also important for the android localization, selection of a goal to achieve it and to perform the assigned tasks in its surroundings. This paper delineates the various gaits like walking, turning, obstacle overcoming and step up-down stairs for a humanoid system. The writing also explicates the design of the indoor test environment with the stationary obstacles placed on the navigation routes. The development of an efficient algorithm is also excogitated based on the various analyses of gaits and the predefined map of the test environment. As the navigation map is predetermined, the designed algorithm animates the humanoid to navigate by selecting an optimal route, depending on some external commands, to reach at the goal position. Finally the performance of the system is analysed based on the elapsed time of the navigation action with the validation of optimal navigation strategy where the designed algorithm demonstrates the robustness of its implementation and execution.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129875718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-09DOI: 10.5923/J.JMEA.20120202.04
R. S. Barbosa
The motivation of this work is to develop a spectral method to deal with the vehicle vibration response when subjected to a longwave measured pavement irregularity. For this purpose, the vehicle model vibration is correlated in the frequency domain with the spectral density function of the pavement irregularity, to achieve the system spectral transfer function. Vehicle transfer function and spectral pavement irregularity results are treated in the frequency domain to obtain the vehicle frequency response due to a longwave road evenness input. The results show that, at 120 km/h in an asphalt pavement with ondulation, the first vehicle vibration mode has a significant movement enlargement, due to the pavement irregularity signature, causing passenger vibrational discomfort and identifying location for maintenance.
{"title":"Vehicle Vibration Response Subjected to Longwave Measured Pavement Irregularity","authors":"R. S. Barbosa","doi":"10.5923/J.JMEA.20120202.04","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120202.04","url":null,"abstract":"The motivation of this work is to develop a spectral method to deal with the vehicle vibration response when subjected to a longwave measured pavement irregularity. For this purpose, the vehicle model vibration is correlated in the frequency domain with the spectral density function of the pavement irregularity, to achieve the system spectral transfer function. Vehicle transfer function and spectral pavement irregularity results are treated in the frequency domain to obtain the vehicle frequency response due to a longwave road evenness input. The results show that, at 120 km/h in an asphalt pavement with ondulation, the first vehicle vibration mode has a significant movement enlargement, due to the pavement irregularity signature, causing passenger vibrational discomfort and identifying location for maintenance.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131085700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-09DOI: 10.5923/J.JMEA.20120202.03
V. Monfared
Analysis of contact stress in rail and wheel is very prominent in mechanical and railway engineering. In this research, numerical analysis (FEA) of contact stress for two rolling bodies is studied by finite element method (FEM). The model considers the wheel and the rail as elastic deformable bodies and requires numerical solutions. The analysis of stresses is carried out by FEM. Next, critical area in rail and wheel are determined by results of stress analysis with numerical method. So we almost can rely on this numerical method and their results for prediction of critical points. To analyse the pressure of collection of the wheel and rail, elliptical, rectangular and circular contact surfaces are assumed for this study. With these assumptions, suitable results will be achieved. The rail fracture, failure and analysis of stress should be studied to prevent rail fracture and events. The analysis of contact stress is performed by FEM and it is compared with different contact surfaces results. These contact areas can be elliptical, rectangular or circular. Also, these results can be useful for analysing of crack creation in critical points and surfaces. Finally, good agreements are found between finite element method (FEM) and pre- vious analytical results for determination of contact stress in rolling bodies.
{"title":"Contact Stress Analysis in Rolling Bodies by Finite Element Method (FEM) Statically","authors":"V. Monfared","doi":"10.5923/J.JMEA.20120202.03","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120202.03","url":null,"abstract":"Analysis of contact stress in rail and wheel is very prominent in mechanical and railway engineering. In this research, numerical analysis (FEA) of contact stress for two rolling bodies is studied by finite element method (FEM). The model considers the wheel and the rail as elastic deformable bodies and requires numerical solutions. The analysis of stresses is carried out by FEM. Next, critical area in rail and wheel are determined by results of stress analysis with numerical method. So we almost can rely on this numerical method and their results for prediction of critical points. To analyse the pressure of collection of the wheel and rail, elliptical, rectangular and circular contact surfaces are assumed for this study. With these assumptions, suitable results will be achieved. The rail fracture, failure and analysis of stress should be studied to prevent rail fracture and events. The analysis of contact stress is performed by FEM and it is compared with different contact surfaces results. These contact areas can be elliptical, rectangular or circular. Also, these results can be useful for analysing of crack creation in critical points and surfaces. Finally, good agreements are found between finite element method (FEM) and pre- vious analytical results for determination of contact stress in rolling bodies.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122511402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-09DOI: 10.5923/J.JMEA.20120202.01
Abdullah AlEssa
This study examined heat transfer enhancement from a horizontal rectangular fin embedded with square per- forations under natural convection compared to the equivalent solid (non perforated) fin. The parameters considered were geometrical dimensions and thermal properties of the fin and of the perforations. The study considered the gain in fin area and extent of heat transfer enhancement due to perforations. It showed also that for certain range of square dimension and spaces between perforations there is an improvement in perforated fin heat dissipation over that of the equivalent solid one. The heat transfer enhancement of the perforated fin increases as the fin thickness is increased.
{"title":"Augmentation of Fin Natural Convection Heat Dissipation by Square Perforations","authors":"Abdullah AlEssa","doi":"10.5923/J.JMEA.20120202.01","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120202.01","url":null,"abstract":"This study examined heat transfer enhancement from a horizontal rectangular fin embedded with square per- forations under natural convection compared to the equivalent solid (non perforated) fin. The parameters considered were geometrical dimensions and thermal properties of the fin and of the perforations. The study considered the gain in fin area and extent of heat transfer enhancement due to perforations. It showed also that for certain range of square dimension and spaces between perforations there is an improvement in perforated fin heat dissipation over that of the equivalent solid one. The heat transfer enhancement of the perforated fin increases as the fin thickness is increased.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"438 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123572303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Assembly line balancing problem (ALBP) is the allocating of assembly tasks to workstations with consideration of some criteria such as time and the number of workstations. Due to the complexity of ALB, finding the optimum solutions in terms of the number of workstations in the assembly line needs suitable meta-heuristic techniques. Genetic algorithms have been used to a large extent. Due to converging to the local optimal solutions to the most genetic algorithms, the balanced exploration of the new area of search space and exploitation of good solutions by this kind of algorithms as a good way can be sharpened with some meta-heuristic. In this paper, the modified cellular (grid) rearranging-population structure is developed. The individuals of the population are located on cells according to the hamming distance value among individuals as neighbours before regenerations and a family of cellular genetic algorithms (CGAs) is defined. By using the cellular structure and the rearrangements, some of the family members can find better solutions compared with others in the same iterations, and they behave much more reasonably in order to acquire the solution in terms of the number of workstations and the smoothly balanced task assignment on criteria conditions.
{"title":"A Cellular-rearranging of Population in Genetic Algorithms to Solve Assembly-Line Balancing Problem","authors":"Hossein Rajabalipour Cheshmehgaz, Mohammd Ishak Desa, Farahnaz Kazemipour","doi":"10.5923/J.JMEA.20120202.05","DOIUrl":"https://doi.org/10.5923/J.JMEA.20120202.05","url":null,"abstract":"Assembly line balancing problem (ALBP) is the allocating of assembly tasks to workstations with consideration of some criteria such as time and the number of workstations. Due to the complexity of ALB, finding the optimum solutions in terms of the number of workstations in the assembly line needs suitable meta-heuristic techniques. Genetic algorithms have been used to a large extent. Due to converging to the local optimal solutions to the most genetic algorithms, the balanced exploration of the new area of search space and exploitation of good solutions by this kind of algorithms as a good way can be sharpened with some meta-heuristic. In this paper, the modified cellular (grid) rearranging-population structure is developed. The individuals of the population are located on cells according to the hamming distance value among individuals as neighbours before regenerations and a family of cellular genetic algorithms (CGAs) is defined. By using the cellular structure and the rearrangements, some of the family members can find better solutions compared with others in the same iterations, and they behave much more reasonably in order to acquire the solution in terms of the number of workstations and the smoothly balanced task assignment on criteria conditions.","PeriodicalId":383435,"journal":{"name":"Journal of Mechanical Engineering and Automation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122130415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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