马雅丽

个人信息Personal Information

教授

博士生导师

硕士生导师

任职 : 数字化所党支部书记、副所长

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:机械工程学院

学科:机械设计及理论

办公地点:机械工程学院9126

联系方式:myl@dlut.edu.cn

电子邮箱:myl@dlut.edu.cn

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Dynamic characteristics of a machine tool at working positions in operating test

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论文类型:会议论文

发表时间:2011-08-28

收录刊物:EI、Scopus

卷号:1

期号:PARTS A AND B

页面范围:457-466

摘要:A machine tool is an assembly structure fitted by some moveable substructures, which the relative motion between the substructures creates normal and limit operating positions. Along with the substructures moving, the distributions of masses, stiffness and damping of the machine in space vary, leading to variety of structure distributions and dynamic properties. For exploring the dynamic properties distributions of machine tools, this paper presents a testing method under practical operational excitations, which is under operating excitations from remaining unbalanced value in the spindle, and collecting vibration signals of time and frequency at the spindle foreside at working positions. To identify resonance characteristics, a judging matrix is established by comparing vibration energy and vibration amplitude at 1 st octave. By this method, MDH50 active pole horizontal machining center is tested, and the dynamic characteristics is determined. It reveals that dynamic characteristics of resonance come from the substructure independent resonance and their superposition in operating excitation. For verifying this result, FEA is conducted, in which 20 nodes brick element and spring element are applied to build the model entities and interfaces. The analysis result by FEM is consistent to the testing results. The research provides foundation for how setting up machining programs to avoid the resonance vibration of the machine in the operating. ? 2011 by ASME.