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Yang ZhiyongZhang DaweiHuang TianSchool of Mechanical Engineering Tianjin University Tianjin ChinaGao YongshengDepartment of Mechanical Engineering Hong Kong University of Scienceand Technology Hong Hong China 《机械工程学报(英文版)》2003,16(2):213-216
The bearing is described by constrain matrix, and the spindle system of a NC surface grinding machine is simplified as elastic-coupling beam, then modal synthesis method is used to establish the dynamic model of beam. Moreover, the response of the end of rotor is analyzed, and the natural frequency, principle mode and other dynamic characteristics of the coupling system are studied, the law of bearing stiffness to coupling frequency and amplitude of rotor is also found. Finally, according to the actual condition, a dynamic absorber is designed. The simulation and experimental results show that the amplitude of spindle can be declined effectively when the dynamic absorber is attached. 相似文献
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DEVELOPMENT OF A 3-DOF MICRO-POSITIONING WORKPIECE TABLE 总被引:1,自引:1,他引:0
Zhang Dawei Tian YanlingSchool of Mechanical Engineering Tianjin University Tianjin ChinaGaoYongshengSchool of Mechanical Engineering Hong Kong University of Scienceand Technology Hong Kong China 《机械工程学报(英文版)》2004,17(1)
In order to achieve active grinding control, a novel numerical control micropositioning workpiece table with a resolution of 6 nm has been developed. The table is driven by three piezoelectric actuators mounted on the base. An elastic structure with three half-notch flexure hinges is designed to apply preload to the piezoelectric actuators. The position of flexure hinges is also elaborately designed with consideration to reduce the bending deformation of the moving part. Three capacitive sensors are used to form close loop control system. Considering the table as a damped 3-DOF mass-spring system, the models of static and dynamic stiffness and error owing to the action of external forces have been established. In order to make the table have high resolution and positioning accuracy, an error compensation algorithm is implemented by using the established models. The experimental testing has been carried out to verify the performance of the workpiece table and the established models of the micropositionin 相似文献
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ZhangDawei TianYanling GaoYongsheng 《机械工程学报(英文版)》2004,17(1):46-50
In order to achieve active grinding control,a novel numerical control micropositioning workpiece table with a resolution of 6 nm has been developed.The table is driven by three piezoelectric actuators mounted on the base.An elastic structure with three half-notch flexure hinges is designed to apply preload to the piezoelectric actuators.The position of flexure hinges is also elaborately designed with consideration to reduce the bending deformation of the moving part.Three capacitive sensors are used to form close loop control system.Considering the table as a damped 3-DOF mass-spring system,the models of static and dynamic stiffness and error owing to the action of external forces have been established.In order to make the table have high resolution and positioning accuracy,an error compensation algorithm is implemented by using the established models.The experimental testing has been carried out to verify the performance of the workpiece table and the established models of the micropositioning workpieee table. 相似文献
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50CrV4钢热轧变形抗力实验研究 总被引:1,自引:0,他引:1
在GLEEBLE-1500热模拟试验机上对50CrV4钢热轧变形抗力进行了实验研究,分析了变形温度,变形速率和变形程度对变形抗力的影响,并按动态软化的热变形理论对变形抗力的变化规律进行了讨论,通过对实验数据的非线性回归分析,给出了拟合精度较高的变形抗力数学模型。 相似文献
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