[1] Liu Xin, Sun Beibei, Li Lie, Chen Jiandong, et al. Nonlinear identification and characterizationof structural joints based on vibration transmissibility [J]. Journal of Southeast University (English Edition), 2018, 34 (1): 36-42. [doi:10.3969/j.issn.1003-7985.2018.01.006]
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Nonlinear identification and characterizationof structural joints based on vibration transmissibility(
)
基于振动传递的结构连接部非线性识别与表征
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 34
- Issue:
- 2018 1
- Page:
- 36-42
- Research Field:
- Mechanical Engineering
- Publishing date:
- 2018-03-20
Info
- Title:
- Nonlinear identification and characterizationof structural joints based on vibration transmissibility
- 基于振动传递的结构连接部非线性识别与表征
- Author(s):
- Liu Xin; Sun Beibei; Li Lie; Chen Jiandong; Xue Fei
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
- Keywords:
- structural joint; vibration transmissibility; nonlinear identification; harmonic balance method
- PACS:
- TH113.1
- DOI:
- 10.3969/j.issn.1003-7985.2018.01.006
- Abstract:
- In order to investigate the nonlinear characteristics of structural joint, the experimental setup with a jointed mass system is established for dynamic characterization analysis and vibration prediction, and a corresponding nonlinearity identification method is studied. First, the sine-sweep vibration test with different base excitation levels are applied to the structural joint system to study the dominant modal of mass rigid motion. Then, based on the harmonic balance method principle, the measured vibration transmissibilities are utilized for nonlinearity identification using different excitation levels. Experimental results show that nonlinear spring and damping force can be represented by a polynomial order approximation. The identified nonlinear stiffness and damping force can predict the system’s response, and they can reveal the shifts of resonant frequency or damping due to discontinuity of contact mechanisms within a certain range.
- 为了研究结构连接部的非线性振动特性, 利用螺栓连接质量系统进行实验平台搭建, 进行了动力学特性分析和响应预测, 并讨论了非线性动力学参数识别问题.首先, 通过不同的基础激励完成系统的正弦扫频实验及模态测试, 以研究集中质量的刚体运动.然后, 基于谐波平衡法原理, 利用不同基础激励下的振动测试结果, 对不同激励力下的连接部非线性进行识别.试验研究结果表明, 连接部的非线性刚度和阻尼力可以通过多项式的形式表达和逼近.识别的非线性刚度和阻尼力可对螺栓结合面的振动响应进行预测, 并可在一定范围内反映由于连接部接触引起的振动非线性, 以及峰值频率偏移和阻尼硬化的现象.
References:
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Memo
- Memo:
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Biographies: Liu Xin(1987—), male, Ph.D.candidate; Sun Beibei(corresponding author), female, doctor, professor, bbsun@seu.edu.cn.
Foundation items: The Major National Science and Technology Project(No.2012ZX04002032, 2013ZX04012032), Graduate Scientific Research Innovation Project of Jiangsu Province(No.KYLX-0096).
Citation: Liu Xin, Sun Beibei, Li Lie, et al.Nonlinear identification and characterization of structural joints based on vibration transmissibility[J].Journal of Southeast University(English Edition), 2018, 34(1):36-42.DOI:10.3969/j.issn.1003-7985.2018.01.006.