The conventional finite element model （FEM） of a rod-type ultrasonic motor is usually simplified by means of continuous composite structure. Because the actual contact characteristics between the parts of the ultras...The conventional finite element model （FEM） of a rod-type ultrasonic motor is usually simplified by means of continuous composite structure. Because the actual contact characteristics between the parts of the ultrasonic motor is ignored, there is bigger error between the calculated values and experimental results. Aiming at solving problem, a new modeling method of a rod-type ultrasonic motor is presented to obtain a high-accuracy FEM. The bolt pretension and the normal contact stiffness and friction coefficient of the contact surface of ultrasonic motor are all considered in this method, and the significant parameters of working mode of the motor are selected by the response surface method, and the goal of calculating the structural response rapidly is realized by building the response surface model to replace the FEM. The result of finite element model updating shows that the average error of modal frequencies of updated model drops to 0.21% from 1.20%. The accuracy of FEM is obviously improved, which indicates that the FEM updating based on response surface method is of great application value on the design for a rod-type ultrasonic motor.展开更多
Abstract Using histochemistry technique, the effects of radiofrequency catheter ablation (RFCA) on the activities of LDH, SDH, CCO, and Ca^2+ ATPase of guinea pig ventricular myocytes were examined. In the ...Abstract Using histochemistry technique, the effects of radiofrequency catheter ablation (RFCA) on the activities of LDH, SDH, CCO, and Ca^2+ ATPase of guinea pig ventricular myocytes were examined. In the meanwhile, the histological changes were observed as Department of Cardiology, Tongji Hospital, Tongji Medical University. Wuhan 430030, China (Wang YG, Lu ZY) Department of Anatomy, Tongji Medical University, Wuhan 430030, China (Xiong XK) control. Radiofreqency energy (500 kHz) delivered was 20W×10s. The resultes were as follows: RFCA resulted in significant impairments in all the four kinds of enzymses but without statistical differences among their areas involved in this energy level, and there are no statistical significant differences when compared with those of histological lesion area. These findings showed consistency in areas of the histological and histochemical lesions resulted from RFCA.展开更多
基金supported by Foundation of the State Key Laboratory of Mechanics and Control of Mechanical Structures(MCMS-0314G02)Open Foundation of Engineering Mechanics Analysis of Key Laboratory of Jiangsu Province+1 种基金Foundation of Basic and Advanced Technology Research of Henan Province(152300410040)Foundation of Science and Technology Development of Zhengzhou(131PPTGG409-1)
文摘The conventional finite element model （FEM） of a rod-type ultrasonic motor is usually simplified by means of continuous composite structure. Because the actual contact characteristics between the parts of the ultrasonic motor is ignored, there is bigger error between the calculated values and experimental results. Aiming at solving problem, a new modeling method of a rod-type ultrasonic motor is presented to obtain a high-accuracy FEM. The bolt pretension and the normal contact stiffness and friction coefficient of the contact surface of ultrasonic motor are all considered in this method, and the significant parameters of working mode of the motor are selected by the response surface method, and the goal of calculating the structural response rapidly is realized by building the response surface model to replace the FEM. The result of finite element model updating shows that the average error of modal frequencies of updated model drops to 0.21% from 1.20%. The accuracy of FEM is obviously improved, which indicates that the FEM updating based on response surface method is of great application value on the design for a rod-type ultrasonic motor.
文摘Abstract Using histochemistry technique, the effects of radiofrequency catheter ablation (RFCA) on the activities of LDH, SDH, CCO, and Ca^2+ ATPase of guinea pig ventricular myocytes were examined. In the meanwhile, the histological changes were observed as Department of Cardiology, Tongji Hospital, Tongji Medical University. Wuhan 430030, China (Wang YG, Lu ZY) Department of Anatomy, Tongji Medical University, Wuhan 430030, China (Xiong XK) control. Radiofreqency energy (500 kHz) delivered was 20W×10s. The resultes were as follows: RFCA resulted in significant impairments in all the four kinds of enzymses but without statistical differences among their areas involved in this energy level, and there are no statistical significant differences when compared with those of histological lesion area. These findings showed consistency in areas of the histological and histochemical lesions resulted from RFCA.
