Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010900
Xiaochun Shi, Weidong He
{"title":"Finite Element Analysis and Tooth Profile Modification Study on TractionGear of High Speed and Heavy Load Locomotive","authors":"Xiaochun Shi, Weidong He","doi":"10.2174/1874155X01509010900","DOIUrl":"https://doi.org/10.2174/1874155X01509010900","url":null,"abstract":"","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127741778","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 : 2015-10-07DOI: 10.2174/1874155X01509010887
Xin-ya Chen, Zhen Chen, Yang Zhao
Extended finite element method (XFEM) is the most effective numerical method to solve discrete mechanical problem. Crack growth problem of two-dimension finite length rectangle panel is researched based on Abaqus XFEM frame. Stress intensity factor is obtained respectively by theoretical calculation and XFEM simulation, which proves reliability of XFEM and the software.
{"title":"Analysis of Sheet Fracture Failure Based on XFEM","authors":"Xin-ya Chen, Zhen Chen, Yang Zhao","doi":"10.2174/1874155X01509010887","DOIUrl":"https://doi.org/10.2174/1874155X01509010887","url":null,"abstract":"Extended finite element method (XFEM) is the most effective numerical method to solve discrete mechanical problem. Crack growth problem of two-dimension finite length rectangle panel is researched based on Abaqus XFEM frame. Stress intensity factor is obtained respectively by theoretical calculation and XFEM simulation, which proves reliability of XFEM and the software.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132490704","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 : 2015-10-07DOI: 10.2174/1874155X01509010992
Q. Jia, Yong Liu, Gang Chen, Hanxu Sun
In this paper, a nonlinear optimal control approach is proposed to plan the motion of a redundant free-floating space manipulator (FFSM) when carrying a heavy payload. Optimal joint trajectories are determined to track a desired end-effector path, for which limitations of the manipulator's load-carrying capacity and tracking accuracy are simultaneously considered. In this method, FFSM is described as a nonlinear system using the dynamics equation. The integrated performance indicator is proposed as the cost function, which includes tracking error punishment of the end- effector, joint-torques optimization, total energy improvement and instability avoidance of the base. Then the state- dependent Riccati equation (SDRE) is established and solved by Taylor series approximation method. The motion planning algorithm is presented, subject to multi-constraints. Simulations are performed for a 7-DOF space manipulator and the results are discussed to illustrate the effectiveness of the proposed approach.
{"title":"State-Dependent Riccati Equation Control for Motion Planning of SpaceManipulator Carrying a Heavy Payload","authors":"Q. Jia, Yong Liu, Gang Chen, Hanxu Sun","doi":"10.2174/1874155X01509010992","DOIUrl":"https://doi.org/10.2174/1874155X01509010992","url":null,"abstract":"In this paper, a nonlinear optimal control approach is proposed to plan the motion of a redundant free-floating space manipulator (FFSM) when carrying a heavy payload. Optimal joint trajectories are determined to track a desired end-effector path, for which limitations of the manipulator's load-carrying capacity and tracking accuracy are simultaneously considered. In this method, FFSM is described as a nonlinear system using the dynamics equation. The integrated performance indicator is proposed as the cost function, which includes tracking error punishment of the end- effector, joint-torques optimization, total energy improvement and instability avoidance of the base. Then the state- dependent Riccati equation (SDRE) is established and solved by Taylor series approximation method. The motion planning algorithm is presented, subject to multi-constraints. Simulations are performed for a 7-DOF space manipulator and the results are discussed to illustrate the effectiveness of the proposed approach.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134368148","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 : 2015-10-07DOI: 10.2174/1874155X01509010922
Zhao Xuejun, Wang Mingfang, Wang Jie, Tong Chuangming, Yuan Xiujiu
This paper focuses on the potential of GA algorithm for adaptive random global search, and WNN resolution as well asthe ability of fault toleranceto build a multi intelligent algorithm based on the GA-WNN model using the filter unit of analog circuit forfault diagnosis. Construction of GA-WNN model was divided into two stages; in the first stage GA was used to optimize theinitial weights, threshold, expansion factor and translation factorof WNN structure; while in the second stage, initially, based on WNN training and learning, global optimal solution was obtained. In the process of usinganalog output signal by using wavelet decomposition, the absolute value of coefficient of each frequency band sequence was obtained along with the energy characteristics of the cross joint, with acombination of feature vectors as the input of the neural network. Through the pretreatment method, in order to reduce the neural network input, neural grid size of neurons was reduced in each layer and the convergence speed of neural network was increased. The experimental results show that the method can diagnose single and multiple soft faults of the circuit, with high speed and high precision.
{"title":"Application Research on Fault Diagnosis of the Filter Unit Based onIntelligent Algorithm of GA and WNN","authors":"Zhao Xuejun, Wang Mingfang, Wang Jie, Tong Chuangming, Yuan Xiujiu","doi":"10.2174/1874155X01509010922","DOIUrl":"https://doi.org/10.2174/1874155X01509010922","url":null,"abstract":"This paper focuses on the potential of GA algorithm for adaptive random global search, and WNN resolution as well asthe ability of fault toleranceto build a multi intelligent algorithm based on the GA-WNN model using the filter unit of analog circuit forfault diagnosis. Construction of GA-WNN model was divided into two stages; in the first stage GA was used to optimize theinitial weights, threshold, expansion factor and translation factorof WNN structure; while in the second stage, initially, based on WNN training and learning, global optimal solution was obtained. In the process of usinganalog output signal by using wavelet decomposition, the absolute value of coefficient of each frequency band sequence was obtained along with the energy characteristics of the cross joint, with acombination of feature vectors as the input of the neural network. Through the pretreatment method, in order to reduce the neural network input, neural grid size of neurons was reduced in each layer and the convergence speed of neural network was increased. The experimental results show that the method can diagnose single and multiple soft faults of the circuit, with high speed and high precision.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"333 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133798789","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 : 2015-10-07DOI: 10.2174/1874155X01509011025
Shi Pengtao, Li Yan, Y. Mingshun, Yao Zimeng
To furthermore optimize the machining parameters and improve the surface quality of the workpieces manufactured by single point incremental forming method, the formation mechanism of the sacle veins on the metal incremental froming workpieces was studied through experiment method. The influence principle of the spindle speed, the feed speed and the material of tip of tools on the length of scale veins was obtained through analyzing the experimental results and building the mathematical model among the length of scale veins, feed speed and spindle speed through measuring the roughness of surfaces and observing the appearance of the forming workpieces. The experimental results showed that, the spindle speed, the feed speed and the material of tool tips have a significant effect on the scale veins formation on the surface of forming workpieces. Therefore, an appropriate group of spindle speed and feed speed can reduce the effect of scale veins on the roughness of single point incremental forming workpieces and furthermore improve the surface quality of forming workpieces.
{"title":"Research on the Influencing Factors of \"Scale Veins\" of Single PointIncremental Forming Workpieces Surface","authors":"Shi Pengtao, Li Yan, Y. Mingshun, Yao Zimeng","doi":"10.2174/1874155X01509011025","DOIUrl":"https://doi.org/10.2174/1874155X01509011025","url":null,"abstract":"To furthermore optimize the machining parameters and improve the surface quality of the workpieces manufactured by single point incremental forming method, the formation mechanism of the sacle veins on the metal incremental froming workpieces was studied through experiment method. The influence principle of the spindle speed, the feed speed and the material of tip of tools on the length of scale veins was obtained through analyzing the experimental results and building the mathematical model among the length of scale veins, feed speed and spindle speed through measuring the roughness of surfaces and observing the appearance of the forming workpieces. The experimental results showed that, the spindle speed, the feed speed and the material of tool tips have a significant effect on the scale veins formation on the surface of forming workpieces. Therefore, an appropriate group of spindle speed and feed speed can reduce the effect of scale veins on the roughness of single point incremental forming workpieces and furthermore improve the surface quality of forming workpieces.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122342393","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 : 2015-10-07DOI: 10.2174/1874155X01509010977
J. Yao, Yu Tang, Zhencai Zhu
During the operation of a crawler crane driven by double winches, it is important to make the two winches actuate synchronously so that the hook is in a horizontal state to prevent accidents. In this paper, a novel synchronization control strategy for crawler crane driven by double winches using hook angle feedback information is proposed. The hook angle proportional to the length error of ropes is measured by a wireless angle sensor firstly and then is employed as a feedback control signal. To further improve the synchronization performance, cross-coupled control scheme together with the variable speed PID control is utilized on the basis of the collected hook angle signal. Simulations and experiments are then conducted and the results demonstrate that the proposed control scheme can obtain a better synchronization performance than the conventional control strategy using encoders and the inclination of the hook is greatly reduced to a limited small range.
{"title":"Synchronization Control of Large Crawler Crane Driven by DoubleWinches Using Hook Angle Feedback Information","authors":"J. Yao, Yu Tang, Zhencai Zhu","doi":"10.2174/1874155X01509010977","DOIUrl":"https://doi.org/10.2174/1874155X01509010977","url":null,"abstract":"During the operation of a crawler crane driven by double winches, it is important to make the two winches actuate synchronously so that the hook is in a horizontal state to prevent accidents. In this paper, a novel synchronization control strategy for crawler crane driven by double winches using hook angle feedback information is proposed. The hook angle proportional to the length error of ropes is measured by a wireless angle sensor firstly and then is employed as a feedback control signal. To further improve the synchronization performance, cross-coupled control scheme together with the variable speed PID control is utilized on the basis of the collected hook angle signal. Simulations and experiments are then conducted and the results demonstrate that the proposed control scheme can obtain a better synchronization performance than the conventional control strategy using encoders and the inclination of the hook is greatly reduced to a limited small range.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127699488","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 : 2015-10-07DOI: 10.2174/1874155X01509011033
Qu Tianwei, M. Weihua, Wu Dong, Luo Shihui
Aimed at the safety problem of the locomotive under the dynamic braking condition, analysis the influence of the coupler and buffer system. The coupler reposition methods of the large rotation angle coupler and the small rotation angle coupler under longitudinal coupler press force was compared. The influence of coupler and buffer system to the dynamics performance of locomotive was researched through dynamic simulation. Results show that the longitudinal coupler press force afforded by large rotation angle coupler with coupler shoulder is larger than that of small rotation angle coupler.
{"title":"Influence of Coupler and Buffer on Dynamics Performance of Heavy HaulLocomotive","authors":"Qu Tianwei, M. Weihua, Wu Dong, Luo Shihui","doi":"10.2174/1874155X01509011033","DOIUrl":"https://doi.org/10.2174/1874155X01509011033","url":null,"abstract":"Aimed at the safety problem of the locomotive under the dynamic braking condition, analysis the influence of the coupler and buffer system. The coupler reposition methods of the large rotation angle coupler and the small rotation angle coupler under longitudinal coupler press force was compared. The influence of coupler and buffer system to the dynamics performance of locomotive was researched through dynamic simulation. Results show that the longitudinal coupler press force afforded by large rotation angle coupler with coupler shoulder is larger than that of small rotation angle coupler.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128297706","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 : 2015-10-07DOI: 10.2174/1874155X01509010966
Shanmao Gu, Yunlong Liu, Ni Zhang, Dexin Du
Fault detection approach based on principal component analysis (PCA) may perform not well when the process is time-varying, because it can cause unfavorable influence on feature extraction. To solve this problem, a modified PCA which considering variance maximization is proposed, referred to as weighted PCA (WPCA). WPCA can obtain the slow features information of observed data in time-varying system. The monitoring statistical indices are based on WPCA model and their confidence limits are computed by kernel density estimation (KDE). A simulation example on continuous stirred tank reactor (CSTR) show that the proposed method achieves better performance from the perspective of both fault detection rate and fault detection time than conventional PCA model.
{"title":"Fault Detection Approach Based on Weighted Principal ComponentAnalysis Applied to Continuous Stirred Tank Reactor","authors":"Shanmao Gu, Yunlong Liu, Ni Zhang, Dexin Du","doi":"10.2174/1874155X01509010966","DOIUrl":"https://doi.org/10.2174/1874155X01509010966","url":null,"abstract":"Fault detection approach based on principal component analysis (PCA) may perform not well when the process is time-varying, because it can cause unfavorable influence on feature extraction. To solve this problem, a modified PCA which considering variance maximization is proposed, referred to as weighted PCA (WPCA). WPCA can obtain the slow features information of observed data in time-varying system. The monitoring statistical indices are based on WPCA model and their confidence limits are computed by kernel density estimation (KDE). A simulation example on continuous stirred tank reactor (CSTR) show that the proposed method achieves better performance from the perspective of both fault detection rate and fault detection time than conventional PCA model.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122242636","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 : 2015-10-07DOI: 10.2174/1874155X01509010961
Zhou Ning, Zhang Jing
In view of local optimization in particle swarm optimization algorithm (PSO algorithm), chaos theory was introduced to PSO algorithm in this paper. Plenty of populations were generated by using the ergodicity of chaotic motion. The uniformly distributed initial particles of the particle swarms were extracted from the populations according to the Euclidean distance between particles, so that the particles could uniformly distribute in the solution space. Local search was carried out on the optimal position of the particles during evolution, so as to improve the development capability of PSO algorithm and prevent its prematurity, thus enhancing its global optimizing capability. Then the improved PSO algorithm was applied to mechanical design optimization. With optimization design for two-stage gear reducer as the study object, objective function and constraint conditions were determined by building a mathematical model of optimization design, thus realizing optimization design. Simulation and comparison between the improved algorithm and unimproved algorithm show that improved PSO algorithm can optimize the optimization results of PSO algorithm at a faster convergence rate.
{"title":"Study on Mechanical Design Optimization Based on Improved ParticleSwarm Optimization Algorithm","authors":"Zhou Ning, Zhang Jing","doi":"10.2174/1874155X01509010961","DOIUrl":"https://doi.org/10.2174/1874155X01509010961","url":null,"abstract":"In view of local optimization in particle swarm optimization algorithm (PSO algorithm), chaos theory was introduced to PSO algorithm in this paper. Plenty of populations were generated by using the ergodicity of chaotic motion. The uniformly distributed initial particles of the particle swarms were extracted from the populations according to the Euclidean distance between particles, so that the particles could uniformly distribute in the solution space. Local search was carried out on the optimal position of the particles during evolution, so as to improve the development capability of PSO algorithm and prevent its prematurity, thus enhancing its global optimizing capability. Then the improved PSO algorithm was applied to mechanical design optimization. With optimization design for two-stage gear reducer as the study object, objective function and constraint conditions were determined by building a mathematical model of optimization design, thus realizing optimization design. Simulation and comparison between the improved algorithm and unimproved algorithm show that improved PSO algorithm can optimize the optimization results of PSO algorithm at a faster convergence rate.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121199176","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 : 2015-10-07DOI: 10.2174/1874155X01509010892
Jin-Taek Jun, W. Hui
Nonlinear hysteresis characteristics are usually utilized in the elastic-plastic seismic analysis of the structure of bridge. These characteristics may be described by the relationship of section bending moment and curvature. This relationship can be obtained by the section size and reinforcement, which is also a simple and time-saving method to evaluate the seismic behavior of the section. The research is conducted on the effect of section bending moment and curvature. Then, five different sections are chosen to observe their effects on bending moment and curvature. The results indicate that with the increase in section size, the crack, the yield, the moment damage and the curvature of the section also increase. The increase in section size refers to the increase in moment of inertia, so with the increase in the moment of inertia, the resistance to crack, field and damage of the bridge pier become stronger. On this basis, the elastic-plastic time history analysis of Wu Guan super highway Gan Gou Zi Bridge is carried out. It shows that the capacity of energy dissipation by hysteretic of the Rectangular thin-wall pier is better than the twin shaft pier. So it is best to use rectangular thin-wall pier in the same condition.
{"title":"The Relationship Between Moment and Curvature and the Elastic-PlasticSeismic Response Analysis of High Pier Section","authors":"Jin-Taek Jun, W. Hui","doi":"10.2174/1874155X01509010892","DOIUrl":"https://doi.org/10.2174/1874155X01509010892","url":null,"abstract":"Nonlinear hysteresis characteristics are usually utilized in the elastic-plastic seismic analysis of the structure of bridge. These characteristics may be described by the relationship of section bending moment and curvature. This relationship can be obtained by the section size and reinforcement, which is also a simple and time-saving method to evaluate the seismic behavior of the section. The research is conducted on the effect of section bending moment and curvature. Then, five different sections are chosen to observe their effects on bending moment and curvature. The results indicate that with the increase in section size, the crack, the yield, the moment damage and the curvature of the section also increase. The increase in section size refers to the increase in moment of inertia, so with the increase in the moment of inertia, the resistance to crack, field and damage of the bridge pier become stronger. On this basis, the elastic-plastic time history analysis of Wu Guan super highway Gan Gou Zi Bridge is carried out. It shows that the capacity of energy dissipation by hysteretic of the Rectangular thin-wall pier is better than the twin shaft pier. So it is best to use rectangular thin-wall pier in the same condition.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116083354","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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