| 基于不完备频响函数辨识结合部等效参数的研究 |
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| 引用本文： | 蔡力钢,李玲,郭铁能,刘志峰,赵永胜.基于不完备频响函数辨识结合部等效参数的研究[J].振动工程学报,2011,24(4). |
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| 作者姓名： | 蔡力钢 李玲 郭铁能 刘志峰 赵永胜 |
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| 作者单位： | 北京工业大学机械工程与应用电子技术学院,北京,100124 |
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| 基金项目： | 国家科技重大专项基金资助项目(2009ZX04014-033); 国家自然科学基金资助项目(50905004) |
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| 摘 要： | 研究了输出信息不完备情况下结合部等效动力学参数的辨识问题,阐述了一种较为通用的结合部等效动力学参数辨识方法.首先采用实验与有限元法相结合,辨识出试验中难以获取的频响函数,构造出完备频响函数.然后通过完备频响函数,运用迭代算法辨识出结合部等效动力学参数.在辨识过程中,建立损失函数模型,将问题转化为求解损失函数的最小值问题.该方法不需要求出模态参数,所以同样适用于大阻尼系统或者模态密集系统的结合部参数辨识.由于只需部分易测的频响函数,所以具有很好的工程应用性.最后通过算例验证了本方法具有很高的辨识精度.
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| 关 键 词： | 参数辨识 频响函数 结合部 有限元法 损失函数 |
Identifying mechanical joint dynamic parameters based on incomplete frequency response functions |
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| CAI Li-gang,LI Ling,GUO Tie-neng,LIU Zhi-feng,ZHAO Yong-sheng.Identifying mechanical joint dynamic parameters based on incomplete frequency response functions[J].Journal of Vibration Engineering,2011,24(4). |
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| Authors: | CAI Li-gang LI Ling GUO Tie-neng LIU Zhi-feng ZHAO Yong-sheng |
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| Affiliation: | CAI Li-gang,LI Ling,GUO Tie-neng,LIU Zhi-feng,ZHAO Yong-sheng(College of Mechanical & Electrical Engineering,Beijing University of Technology,Beijing 100124,China) |
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| Abstract: | Joint often have a significant effect on the dynamical behavior of assembled mechanical structures.The dynamical characteristic of joint is complex,and many researches focus on the identification of it.A new method to identify the joint parameters is proposed based on the incomplete input information in this paper.Firstly,the unmeasured frequency response functions(FRFs) are identified by experimental and finite element method,and completely FRFs are constructed.Then,the dynamic parameters of joint are iden... |
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| Keywords: | parameter identification frequency response function joint finite element method loss function |
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