基于实测扫频响应反推管路卡箍支承刚度及阻尼

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摘要为了建立管路系统动力学模型并分析其振动特性，需获取动载荷下卡箍支承刚度及阻尼等力学特性参数。该研究提出一种基于实测扫频响应的响应面法来反推上述参数的方法；提出了基于响应面反推管路卡箍支承刚度和阻尼的辨识算法；利用自编有限元创建了管体-卡箍系统的动力学模型，推导了管路系统振动响应；在利用响应面法的匹配计算中，进行了卡箍刚度及阻尼关于频率和对应响应的多项式拟合，并采用基本遗传算法进行了优化。在实例研究中，用提出的方法辨识出了所研究管路卡箍的具有频率依赖性的支承刚度和阻尼；将辨识值回代到分析模型中，通过比较预测的与实测的频域响应，共振频率及响应偏差均小于3%，证明了辨识结果的合理性。

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	高晔1
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	孙伟1
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	马辉1
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关键词 ：管路卡箍, 支承刚度, 支承阻尼, 频域响应, 反推辨识

Abstract：To establish the dynamic model of a pipeline system and analyze the vibration characteristics, it is necessary to obtain mechanical characteristic parameters of the hoop such as the support stiffness and damping under dynamic load.In this paper, a response surface method for identifying the parameters above was proposed, which was based on the measured sweep response.Firstly, an identification algorithm based on response surface was proposed to identify the stiffness and damping of the pipeline hoop.The dynamic model of the pipe-hoop system was created by the developed finite element method, and the vibration response of pipeline system was deduced.Then on the basis of response surface method, the polynomial fitting of stiffness and damping about frequency and corresponding response was carried out by the matching calculation, and the simple genetic algorithm was used for optimization.Finally, a case study was carried, and the support stiffness and damping with frequency-dependent characteristic were identified by the proposed method.By including identified values into the analysis model, the relative errors between predicted and measured resonance frequency and response are both less than 3% and then the reliability of the identified results was proved.

Key words： pipeline hoop support stiffness support damping frequency response inverse identification

收稿日期: 2018-11-27 出版日期: 2020-04-15

引用本文:

高晔1,2，孙伟1,2，马辉1,2. 基于实测扫频响应反推管路卡箍支承刚度及阻尼[J]. 振动与冲击, 2020, 39(8): 58-63.
GAO Ye1,2，SUN Wei1,2，MA Hui1,2. Inverse identification of the pipeline support stiffness and damping of the hoop based on the measured sweep frequency response. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(8): 58-63.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I8/58

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