基于3/2维谱的螺栓松动非线性检测及定位

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (5) : 157-163.

论文

武金，屈文忠，肖黎

作者信息 +

Bolt looseness nonlinearity detection and location based on 3/2-D spectrum

WU Jin, QU Wenzhong, XIAO Li

Author information +

文章历史 +

摘要

提出基于3/2维谱分析的螺栓松动非线性检测及定位方法，用多尺度法分析螺栓松动产生非线性相位耦合的机理，研究3/2维谱分析处理信号的过程并分析其识别非线性二次谐波原理，以铝板上螺栓结构为实验对象，利用粘贴在铝板表面的压电作动/传感元件进行实验，对结构响应信号进行3/2谱分析，有效判断螺栓的连接状态；为实现松动螺栓的定位，定义螺栓松动的非线性指标，引入径向基插值函数，实验获得粘贴在铝板上压电列阵响应信号的非线性指标，利用径向基插值函数拟合损伤定位图像。实验结果表明，该方法能有效检测螺栓松动非线性，实现松动螺栓定位。

Abstract

A method for bolt loosening nonlinearity detection and location based on 3/2-D spectral analysis was proposed.The multi-scale method was used to analyze the mechanism of nonlinear phase coupling produced by bolt looseness, study the signal-processing process with 3/2-D spectral analysis and analyze the principle of its identifying nonlinear second harmonics.A bolt structure on an aluminum plate were taken as the test object, piezoelectric actuator/sensor elements bonded on the aluminum plate were used to perform tests, and 3/2-D spectral analysis was done for structural response signals to effectively judge the bolt’s connection state.In order to realize loose bolt’s positioning, the nonlinear index for bolt loosening was defined, and the radial basis interpolating function was introduced.The nonlinear index for response signals of the piezoelectric array bonded on the aluminum plate was obtained with tests, and the radial basis interpolating function was used to fit the damage location image.The test results showed that the proposed method can effectively detect bolt loosening nonlinearity and realize loose bolt’s positioning.

导出引用

武金，屈文忠，肖黎. 基于3/2维谱的螺栓松动非线性检测及定位[J]. 振动与冲击, 2020, 39(5): 157-163

WU Jin, QU Wenzhong, XIAO Li. Bolt looseness nonlinearity detection and location based on 3/2-D spectrum[J]. Journal of Vibration and Shock, 2020, 39(5): 157-163

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