- YANG Da-peng;PAN Hai-yang;ZHAO Yao;LI Tian-yun;
In this article,elastic-plastic curved crack tip opening displacement maximum in hardened material under dynamic load has been studied,and curved crack tip opening displacement has been calculated as a practical application of a second order perturbation method and theorem of surname KA,where the effects of dynamic applied stresses and dynamic normal and shear stresses on the boundaries of plastic area are synthetically taken into considerations. Diagrams have been constructed to analyz the transformation relationships between the curved crack tip opening displacement and the work hardening exponents. Curved crack tip opening displacement will decrease with the increasing of hardening exponents in hardened material. The decrease extent of curved crack tip dynamic opening displacement will be more and more severe when hardening exponents increase evenly. Maximum dynamic opening displacement of curved crack tip will decrease when external load decrease with the same hardening exponents.
2015年03期 v.20 125-138页 [查看摘要][在线阅读][下载 2295K] - YANG Da-peng;PAN Hai-yang;ZHAO Yao;LI Tian-yun;
In this article,elastic-plastic curved crack tip opening displacement maximum in hardened material under dynamic load has been studied,and curved crack tip opening displacement has been calculated as a practical application of a second order perturbation method and theorem of surname KA,where the effects of dynamic applied stresses and dynamic normal and shear stresses on the boundaries of plastic area are synthetically taken into considerations. Diagrams have been constructed to analyz the transformation relationships between the curved crack tip opening displacement and the work hardening exponents. Curved crack tip opening displacement will decrease with the increasing of hardening exponents in hardened material. The decrease extent of curved crack tip dynamic opening displacement will be more and more severe when hardening exponents increase evenly. Maximum dynamic opening displacement of curved crack tip will decrease when external load decrease with the same hardening exponents.
2015年03期 v.20 125-138页 [查看摘要][在线阅读][下载 2295K] - Zhang Jian;Yan Li-wen;Yan Yan;
To analyze a certain type of trees crusher working condition,to consider the limitation of electric,the motor driven pulverizer can only work in a fixed place. Therefore,a set of hydraulic system is used to replace the motor. So it can get rid of electricity,and move conveniently,applying to the suburbs,parks,roadsides,which means expanding the range of application. Secondly,in view of the pulverizer speed higher than the motor speed,it is necessary to add the auxiliary speed regulating device. Besides, to adjust speed is more troublesome,and the hydraulic motor can directly drive the pulverizer. Therefore to adjust the flow of the hydraulic motor can change the speed of the pulverizer. In addition,base on the characteristics of work start,and stop,with a long time,big moment of inertia for Pulverizer,and it is the growth process of the motor driving pulverizer. The rotary inertia equivalent to the motor end will increase the square of the reduce ratio,and the load of the machine obviously. Driving by hydraulic motor straightly,and this problem will be avoided. Finally,in the light of the large start-up torque,and the high speed at working time of the pulverizer,the constant power pumps is choosed to meet the work demand. Constant power pumps can adjust the flow and pressure according to the different load automatically,thus more energy are saved. Hydraulic system simulation model is established based on the AMESim simulation,which verify the scheme is feasible.
2015年03期 v.20 139-148页 [查看摘要][在线阅读][下载 1476K] - Zhang Jian;Yan Li-wen;Yan Yan;
To analyze a certain type of trees crusher working condition,to consider the limitation of electric,the motor driven pulverizer can only work in a fixed place. Therefore,a set of hydraulic system is used to replace the motor. So it can get rid of electricity,and move conveniently,applying to the suburbs,parks,roadsides,which means expanding the range of application. Secondly,in view of the pulverizer speed higher than the motor speed,it is necessary to add the auxiliary speed regulating device. Besides, to adjust speed is more troublesome,and the hydraulic motor can directly drive the pulverizer. Therefore to adjust the flow of the hydraulic motor can change the speed of the pulverizer. In addition,base on the characteristics of work start,and stop,with a long time,big moment of inertia for Pulverizer,and it is the growth process of the motor driving pulverizer. The rotary inertia equivalent to the motor end will increase the square of the reduce ratio,and the load of the machine obviously. Driving by hydraulic motor straightly,and this problem will be avoided. Finally,in the light of the large start-up torque,and the high speed at working time of the pulverizer,the constant power pumps is choosed to meet the work demand. Constant power pumps can adjust the flow and pressure according to the different load automatically,thus more energy are saved. Hydraulic system simulation model is established based on the AMESim simulation,which verify the scheme is feasible.
2015年03期 v.20 139-148页 [查看摘要][在线阅读][下载 1476K] - ZHANG Yun-hua;JIA Hai-li;ZHANG Shao-fang;
In order to accelerate the product design and shorten the development cycle,the product design base on Top-Down and product level parametric design method. Based on the 2K-V type of product structure tree,the mapping of the structure tree to the hierarchical skeleton feature tree is completed and the modeling of the product's 3D cascade skeleton is built with Pro / E skeleton Technology. The skeleton model is the basis of assembly,then to build the framework of the model's cascade constraints and to realize the whole model driven by the top skeleton parameters. The designers can build new models in the design of the similar structure through the rapid variant design of top skeleton parameters.
2015年03期 v.20 149-155页 [查看摘要][在线阅读][下载 864K] - ZHANG Yun-hua;JIA Hai-li;ZHANG Shao-fang;
In order to accelerate the product design and shorten the development cycle,the product design base on Top-Down and product level parametric design method. Based on the 2K-V type of product structure tree,the mapping of the structure tree to the hierarchical skeleton feature tree is completed and the modeling of the product's 3D cascade skeleton is built with Pro / E skeleton Technology. The skeleton model is the basis of assembly,then to build the framework of the model's cascade constraints and to realize the whole model driven by the top skeleton parameters. The designers can build new models in the design of the similar structure through the rapid variant design of top skeleton parameters.
2015年03期 v.20 149-155页 [查看摘要][在线阅读][下载 864K] - ZHENG Yu;WANG Kai;XI Chuan-peng;LA Zhao;
In this paper,deep grove ball bearing GB6206 has been chosen as research object,and the explicit dynamics analysis method in ANSYS / LS-DYNA has been used to study features of fault bearing which with a tiny pit in the inner ring raceway. In the process of building this bearing FEM,the following parameters have been well considered,such as boundary conditions,friction,contaction,loads and so on. Through simulation,the corresponding equivalent stress nephograms and acceleration of nodes on the inner ring raceway has been obtained. According to features of acceleration which occurs neighbor to fault pit,bearing' s fault diagnosis has been realized. This paper provides a new way in monitoring bearing status and diagnosing fault of bearing.
2015年03期 v.20 156-169页 [查看摘要][在线阅读][下载 3936K] - ZHENG Yu;WANG Kai;XI Chuan-peng;LA Zhao;
In this paper,deep grove ball bearing GB6206 has been chosen as research object,and the explicit dynamics analysis method in ANSYS / LS-DYNA has been used to study features of fault bearing which with a tiny pit in the inner ring raceway. In the process of building this bearing FEM,the following parameters have been well considered,such as boundary conditions,friction,contaction,loads and so on. Through simulation,the corresponding equivalent stress nephograms and acceleration of nodes on the inner ring raceway has been obtained. According to features of acceleration which occurs neighbor to fault pit,bearing' s fault diagnosis has been realized. This paper provides a new way in monitoring bearing status and diagnosing fault of bearing.
2015年03期 v.20 156-169页 [查看摘要][在线阅读][下载 3936K] - PANG Xue-qin;REN Chong;HAN Lei-gang;
Fused deposition molding is an advanced kind of rapid prototyping technology. On the accuracy of the forming process,the research on the temperature of the molding material is based on the analysis of the forming parameters. The influence of the temperature of the molding material on the specimen is reasonably described by the actual forming part and the finite element analysis model. The experimental results show that the temperature of the molding material is less affected by the temperature of the molding material in a certain range. This will lay the theoretical foundation for the formation of the molding technology in the future.
2015年03期 v.20 170-178页 [查看摘要][在线阅读][下载 1094K] - PANG Xue-qin;REN Chong;HAN Lei-gang;
Fused deposition molding is an advanced kind of rapid prototyping technology. On the accuracy of the forming process,the research on the temperature of the molding material is based on the analysis of the forming parameters. The influence of the temperature of the molding material on the specimen is reasonably described by the actual forming part and the finite element analysis model. The experimental results show that the temperature of the molding material is less affected by the temperature of the molding material in a certain range. This will lay the theoretical foundation for the formation of the molding technology in the future.
2015年03期 v.20 170-178页 [查看摘要][在线阅读][下载 1094K] - WANG Kai;LI Peng-yang;LI Yan-Li;ZHENG Yu;LA Zhao;
In field of rolling bearing fault diagnosis,the sampled bearing vibration signals will be generally disturbed with noise. In noisy environment,the conventional blind source separation method is not good for diagnosing bearing faults. In this paper,wavelet de-noising method and blind source separation technology have been combined. In order to achieve fault diagnosis of rolling bearing,firstly wavelet soft threshold de-noising method has been applied on sampled signals. Then the better robust JADE algorithm has been applied in signals blind source separation. At last,vibration signals bearing inner and outer faults of have been analyzed in this paper,and the corresponding bearing faults have been diagnosed successfully. The proposed research methods provide a new way for diagnosing rolling bearing's mixed faults under noise.
2015年03期 v.20 179-188页 [查看摘要][在线阅读][下载 1911K] - WANG Kai;LI Peng-yang;LI Yan-Li;ZHENG Yu;LA Zhao;
In field of rolling bearing fault diagnosis,the sampled bearing vibration signals will be generally disturbed with noise. In noisy environment,the conventional blind source separation method is not good for diagnosing bearing faults. In this paper,wavelet de-noising method and blind source separation technology have been combined. In order to achieve fault diagnosis of rolling bearing,firstly wavelet soft threshold de-noising method has been applied on sampled signals. Then the better robust JADE algorithm has been applied in signals blind source separation. At last,vibration signals bearing inner and outer faults of have been analyzed in this paper,and the corresponding bearing faults have been diagnosed successfully. The proposed research methods provide a new way for diagnosing rolling bearing's mixed faults under noise.
2015年03期 v.20 179-188页 [查看摘要][在线阅读][下载 1911K] -
<正>Journal Introduction"International Journal of Plant Engineering and Management"is in the charge of Ministry of Industry and Information Technology of the People's Republic of China,and organized by Northwestern Polytechnical University.It is a kind of English academic quarterly publication publicly issued at home and abroad.Plant engineering and management is a comprehensive interdisciplinary subject mainly reporting academic research on the
2015年03期 v.20 189页 [查看摘要][在线阅读][下载 89K] <正>Journal Introduction"International Journal of Plant Engineering and Management"is in the charge of Ministry of Industry and Information Technology of the People's Republic of China,and organized by Northwestern Polytechnical University.It is a kind of English academic quarterly publication publicly issued at home and abroad.Plant engineering and management is a comprehensive interdisciplinary subject mainly reporting academic research on the
2015年03期 v.20 189页 [查看摘要][在线阅读][下载 89K]