As a non-standard core equipment of the-101℃class rectisol unit,the hydrogen sulfide/carbon dioxide absorber fabricated by the Wuhan Donghai Heavy-duty Petrochemical Equipment Manufacturing Company has
A Study on the Mechanism and Characterdthe Industrial and Spatial Transference ofFDI In China……………………………………………………………………………LICuo-ping YANCKai-zhong HEQi-chun etal.（1）Study on Urban LaLand...A Study on the Mechanism and Characterdthe Industrial and Spatial Transference ofFDI In China……………………………………………………………………………LICuo-ping YANCKai-zhong HEQi-chun etal.（1）Study on Urban LaLand Saving In the Economic Developed Coastal Regon ofChina……………………………………………………………………………………SHENJian-rong CHENShuang YAOShi-mou（11）Social Polarization and Segregation In Beijing…………………………………·，…………………………………GU Chao－lin（17）展开更多
Vol.43,No.7,2007 NOVEL RECOATING PROCESS WITH DYNAMIC OPTIMIZED BLADE SPEED XU Guangshen ZHAO Wanhua LU Bingheng (1.Department of Mechanical Engineering, Xi’an Polytechnic University,Xi’an 710048,China; 2.Institute ...Vol.43,No.7,2007 NOVEL RECOATING PROCESS WITH DYNAMIC OPTIMIZED BLADE SPEED XU Guangshen ZHAO Wanhua LU Bingheng (1.Department of Mechanical Engineering, Xi’an Polytechnic University,Xi’an 710048,China; 2.Institute of Advanced Manufacturing Technology, Xi’an Jiaotong University,Xi’an 710049,China) In order to improve the recoating quality of piston recoating system and resolve the problem that resin layer thickness increases with the height of object during building process in high-resolution stereolitho- graphy system,a novel recoating process whose blade speed is dynami- cally optimized during building process is proposed.Experiments are carried out to investigate the influence of blade speed and object height on the thickness of resin layer.The mathematical model describing the rela- tionship of recoating layer thickness with object height and blade speed is展开更多
EMBEDDED-BASED NETWORK NUMERICAL CONTROL TECHNOLOGY AND SYSTEM ZHOU Zude LONG Yihong LIU Quan (Hubei Digital Manufacturing Key Laboratory, Wuhan University of Technology, Wuhan 430070, China) 1 Abstract:It is indicate...EMBEDDED-BASED NETWORK NUMERICAL CONTROL TECHNOLOGY AND SYSTEM ZHOU Zude LONG Yihong LIU Quan (Hubei Digital Manufacturing Key Laboratory, Wuhan University of Technology, Wuhan 430070, China) 1 Abstract:It is indicated that the general-purposed PC-based numerical control (NC) technology suffers from a number of problems, such as mis-match between system resources and application needs, unsuitability of the operating system to real-time control, lack of self-owned展开更多
Method of Conceptual Design of Mechanic Product Driven by Generalized Performance WEI Zhe TAN Jianrong FENG Yixiong (State Key Laboratory of CAD&CG,Zhejiang University, Hangzhou 310027,China) Generalized performan...Method of Conceptual Design of Mechanic Product Driven by Generalized Performance WEI Zhe TAN Jianrong FENG Yixiong (State Key Laboratory of CAD&CG,Zhejiang University, Hangzhou 310027,China) Generalized performance of product is used as an effective tool to drive the whole process of conceptual design of mechanical product. Generalized performance of product is defined by utilizing the deduction of axiom of"object structure"which is combined with"P-E"system.And展开更多
Vol.44,No.9,2008 The end effect of empirical mode decomposition that appears when using spline interpolation to get two envelops of the data is dis- cussed.The shortage of ordinary end extending methods is pointed out...Vol.44,No.9,2008 The end effect of empirical mode decomposition that appears when using spline interpolation to get two envelops of the data is dis- cussed.The shortage of ordinary end extending methods is pointed out.An extending method based on trigonometric functions is improved,and the influence of different extending periods,length and value of end point of the data is discussed.A comparison with mirror extending method is made and analyzed.On the basis of the improved method,a new method with exponent sine function extending approach is proposed,which decreases the envelop emanation of end points of extending data,so it can improve the speed and precision of EMD,and simulation is used to prove the effec- tiveness.Results show that the proposed improved extending method can restrain the end effect effectively.展开更多
Vol.44,No.3,2008 Investigation into Mechanism of Initial Rail Corrugation Formation at a Curved Track JIN Xuesong WEN Zefeng XIAO Xinbiao (Traction Power State Key Laboratory,Southwest Jiaotong University, Chengdu 610...Vol.44,No.3,2008 Investigation into Mechanism of Initial Rail Corrugation Formation at a Curved Track JIN Xuesong WEN Zefeng XIAO Xinbiao (Traction Power State Key Laboratory,Southwest Jiaotong University, Chengdu 610031,China) The mechanism of initial rail corrugation formation at a curved track is analyzed with a numerical method.The numerical method consid- ers a combination of a coupling dynamic model of a half railway vehicle and a finite length curved track, Kalker′s theory of three-dimensional elastic bodies in rolling contact,and a material wear model,The Hertzian contact non-linear spring with a unilateral restrain and the non-linear tan- gent creep-force model by SHEN-Elkins-Hydrick are used to couple the vehicle model with the track model.Through the detailed analysis on the dynamic behavior of the vehicle curving and the transient contact geome- try of the wheelset and track,the normal forces,the creepases,the contact point positions,and the contact geometry parameters of the wheels and the rails are obtained.According to the known numerical results the rolling展开更多
Vol.44,No.3,2008 Investigation into Mechanism of Initial Rail Corrugation Formation at a Curved Track JIN Xuesong WEN Zefeng XIAO Xinbiao (Traction Power State Key Laboratory,Southwest Jiaotong University, Chengdu 610...Vol.44,No.3,2008 Investigation into Mechanism of Initial Rail Corrugation Formation at a Curved Track JIN Xuesong WEN Zefeng XIAO Xinbiao (Traction Power State Key Laboratory,Southwest Jiaotong University, Chengdu 610031,China) The mechanism of initial rail corrugation formation at a curved track is analyzed with a numerical method.The numerical method consid- ers a combination of a coupling dynamic model of a half railway vehicle and a finite length curved track, Kalker′s theory of three-dimensional elastic bodies in rolling contact,and a material wear model,The Hertzian contact non-linear spring with a unilateral restrain and the non-linear tan- gent creep-force model by SHEN-Elkins-Hydrick are used to couple the vehicle model with the track model.Through the detailed analysis on the dynamic behavior of the vehicle curving and the transient contact geome- try of the wheelset and track,the normal forces,the creepases,the contact point positions,and the contact geometry parameters of the wheels and the rails are obtained.According to the known numerical results the展开更多
No. 1 Relationship Between Producer Services Developing Level and Urban Hierarchy ZHONG Yun, YAN Xiaopei Empirical Analysis of Xinjiang's Bilateral Trade: Gravity Model Approach CHEN Xuegang, YANG Zhaoping, LIU X...No. 1 Relationship Between Producer Services Developing Level and Urban Hierarchy ZHONG Yun, YAN Xiaopei Empirical Analysis of Xinjiang's Bilateral Trade: Gravity Model Approach CHEN Xuegang, YANG Zhaoping, LIU Xuling Rural-urban Migration, Rural Household Income and Local Geographical Contexts YANG Chunyue, LU Qi, XIE Lishuang Spatial Pattern and Influencing Factor of County-level Industrial Development in Liaoning Province of China GAO Xiaona, MA展开更多
APPLICATION OF GENERALIZED DYNAMIC MATRIX CONTROL WITH STATE OBSERVER IN POSITION SERVO SYSTEM OF STRIP MILL WANG Yiqun SUN Menghui ZHANG Wei LIU Jian(College of Mechanical Engineering,Yanshan University,Qinhuangdao 0...APPLICATION OF GENERALIZED DYNAMIC MATRIX CONTROL WITH STATE OBSERVER IN POSITION SERVO SYSTEM OF STRIP MILL WANG Yiqun SUN Menghui ZHANG Wei LIU Jian(College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China) The structure of the strip mill is complicated,and its control sys- tem becomes more and more precise and intellective.But the PID control strategy,being comprehensively used in the locale,is difficult to satisfy the request of improving the control precision of the strip mill,because the ro- bust is not very well.So the generalized dynamic matrix control was applied to design the predictive controllers in position servo system of strip mill,and strategy of the receding-horizon optimization,and the feedback correction were adopted.The state observer was constructed,which made the control展开更多
文摘As a non-standard core equipment of the-101℃class rectisol unit,the hydrogen sulfide/carbon dioxide absorber fabricated by the Wuhan Donghai Heavy-duty Petrochemical Equipment Manufacturing Company has
文摘A Study on the Mechanism and Characterdthe Industrial and Spatial Transference ofFDI In China……………………………………………………………………………LICuo-ping YANCKai-zhong HEQi-chun etal.（1）Study on Urban LaLand Saving In the Economic Developed Coastal Regon ofChina……………………………………………………………………………………SHENJian-rong CHENShuang YAOShi-mou（11）Social Polarization and Segregation In Beijing…………………………………·，…………………………………GU Chao－lin（17）
文摘Vol.43,No.7,2007 NOVEL RECOATING PROCESS WITH DYNAMIC OPTIMIZED BLADE SPEED XU Guangshen ZHAO Wanhua LU Bingheng (1.Department of Mechanical Engineering, Xi’an Polytechnic University,Xi’an 710048,China; 2.Institute of Advanced Manufacturing Technology, Xi’an Jiaotong University,Xi’an 710049,China) In order to improve the recoating quality of piston recoating system and resolve the problem that resin layer thickness increases with the height of object during building process in high-resolution stereolitho- graphy system,a novel recoating process whose blade speed is dynami- cally optimized during building process is proposed.Experiments are carried out to investigate the influence of blade speed and object height on the thickness of resin layer.The mathematical model describing the rela- tionship of recoating layer thickness with object height and blade speed is
文摘EMBEDDED-BASED NETWORK NUMERICAL CONTROL TECHNOLOGY AND SYSTEM ZHOU Zude LONG Yihong LIU Quan (Hubei Digital Manufacturing Key Laboratory, Wuhan University of Technology, Wuhan 430070, China) 1 Abstract:It is indicated that the general-purposed PC-based numerical control (NC) technology suffers from a number of problems, such as mis-match between system resources and application needs, unsuitability of the operating system to real-time control, lack of self-owned
文摘Method of Conceptual Design of Mechanic Product Driven by Generalized Performance WEI Zhe TAN Jianrong FENG Yixiong (State Key Laboratory of CAD&CG,Zhejiang University, Hangzhou 310027,China) Generalized performance of product is used as an effective tool to drive the whole process of conceptual design of mechanical product. Generalized performance of product is defined by utilizing the deduction of axiom of"object structure"which is combined with"P-E"system.And
文摘Vol.44,No.9,2008 The end effect of empirical mode decomposition that appears when using spline interpolation to get two envelops of the data is dis- cussed.The shortage of ordinary end extending methods is pointed out.An extending method based on trigonometric functions is improved,and the influence of different extending periods,length and value of end point of the data is discussed.A comparison with mirror extending method is made and analyzed.On the basis of the improved method,a new method with exponent sine function extending approach is proposed,which decreases the envelop emanation of end points of extending data,so it can improve the speed and precision of EMD,and simulation is used to prove the effec- tiveness.Results show that the proposed improved extending method can restrain the end effect effectively.
文摘Vol.44,No.3,2008 Investigation into Mechanism of Initial Rail Corrugation Formation at a Curved Track JIN Xuesong WEN Zefeng XIAO Xinbiao (Traction Power State Key Laboratory,Southwest Jiaotong University, Chengdu 610031,China) The mechanism of initial rail corrugation formation at a curved track is analyzed with a numerical method.The numerical method consid- ers a combination of a coupling dynamic model of a half railway vehicle and a finite length curved track, Kalker′s theory of three-dimensional elastic bodies in rolling contact,and a material wear model,The Hertzian contact non-linear spring with a unilateral restrain and the non-linear tan- gent creep-force model by SHEN-Elkins-Hydrick are used to couple the vehicle model with the track model.Through the detailed analysis on the dynamic behavior of the vehicle curving and the transient contact geome- try of the wheelset and track,the normal forces,the creepases,the contact point positions,and the contact geometry parameters of the wheels and the rails are obtained.According to the known numerical results the rolling
文摘Vol.44,No.3,2008 Investigation into Mechanism of Initial Rail Corrugation Formation at a Curved Track JIN Xuesong WEN Zefeng XIAO Xinbiao (Traction Power State Key Laboratory,Southwest Jiaotong University, Chengdu 610031,China) The mechanism of initial rail corrugation formation at a curved track is analyzed with a numerical method.The numerical method consid- ers a combination of a coupling dynamic model of a half railway vehicle and a finite length curved track, Kalker′s theory of three-dimensional elastic bodies in rolling contact,and a material wear model,The Hertzian contact non-linear spring with a unilateral restrain and the non-linear tan- gent creep-force model by SHEN-Elkins-Hydrick are used to couple the vehicle model with the track model.Through the detailed analysis on the dynamic behavior of the vehicle curving and the transient contact geome- try of the wheelset and track,the normal forces,the creepases,the contact point positions,and the contact geometry parameters of the wheels and the rails are obtained.According to the known numerical results the
文摘No. 1 Relationship Between Producer Services Developing Level and Urban Hierarchy ZHONG Yun, YAN Xiaopei Empirical Analysis of Xinjiang's Bilateral Trade: Gravity Model Approach CHEN Xuegang, YANG Zhaoping, LIU Xuling Rural-urban Migration, Rural Household Income and Local Geographical Contexts YANG Chunyue, LU Qi, XIE Lishuang Spatial Pattern and Influencing Factor of County-level Industrial Development in Liaoning Province of China GAO Xiaona, MA
文摘APPLICATION OF GENERALIZED DYNAMIC MATRIX CONTROL WITH STATE OBSERVER IN POSITION SERVO SYSTEM OF STRIP MILL WANG Yiqun SUN Menghui ZHANG Wei LIU Jian(College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China) The structure of the strip mill is complicated,and its control sys- tem becomes more and more precise and intellective.But the PID control strategy,being comprehensively used in the locale,is difficult to satisfy the request of improving the control precision of the strip mill,because the ro- bust is not very well.So the generalized dynamic matrix control was applied to design the predictive controllers in position servo system of strip mill,and strategy of the receding-horizon optimization,and the feedback correction were adopted.The state observer was constructed,which made the control
