Application of bolt joints dynamic parameters identification in machine tools based on partially measured frequency response functions
Application of bolt joints dynamic parameters identification in machine tools based on partially measured frequency response functions
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发表时间：
2015-05
影响因子：
1
通讯作者：
Congying Deng;Liang Heng;Qin Yin;Lijun Lin;Guofu Yin
中科院分区：
文献类型：
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作者：
Congying Deng;Liang Heng;Qin Yin;Lijun Lin;Guofu Yin
提出了一种基于部分实测频响函数的螺栓联接动态参数识别方法，并给出了该方法在机床上的应用。推导了基于子结构法识别结构动力特性的基本公式，并提出了一种估计未测频响函数的算法。该识别方法避免了对频率响应函数矩阵的直接求逆，并通过螺栓连接的自由装配钢梁的仿真和实测频响函数的比较验证了其有效性。提出了在保证接触条件不变的前提下，通过构造子结构与联接结构的组合结构来代替机床中的螺栓联接，从而将辨识应用于机床的方法。以某立式加工中心床身立柱螺栓联接的识别为例，说明了该方法的应用过程和可行性。
This paper presents a method to identify the bolt joints dynamic parameters based on partially measured frequency response functions (FRFs) and demonstrates its application in machine tools. Basic formulas are derived to identify the joint dynamic properties based on the substructuring method and an algorithm to estimate the unmeasured FRFs is also developed. The identification avoids direct inverse calculation to the frequency response function matrix, and its validity is demonstrated by comparing the simulated and measured FRFs of the assembled free-free steel beams with a bolt joint. An approach is put forward to apply the identification in machine tools by constructing structures assembled of substructures and joint structures to substitute the bolt joints in machine tools and assuring the contact conditions unchanged. The identification of the bed-column bolt joint in a vertical machining center is provided to describe the application procedure and show the feasibility of the proposed approach.