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首页> 外文期刊>International Journal of Vehicle Noise and Vibration >Vibration testing of vehicle components by random excitations with increased kurtosis
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Vibration testing of vehicle components by random excitations with increased kurtosis

机译：通过增加峰度的随机激励对车辆部件进行振动测试

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Non-Gaussian random vibration testing with kurtosis control is considered in the paper as a way of introducing realistic high peaks into shaker drive signals, thereby increasing the excitation crest factor. This is required for more accurate simulation of ground vehicle vibrations. Implementing kurtosis, not the crest factor itself, as an additional test specification along with the PSD, leads to closed-form expressions for the non-Gaussian simulation criteria and allows for analytical solutions as a result. An approach of subjecting Gaussian signals to polynomial transformation is simple but has an inherent tendency of introducing frequency distortions jeopardising the PSD simulation. There is no such difficulty with the IFFT phase manipulation approach because the power spectrum is not influenced by the phases. A phase selection procedure capable of modelling random excitations with high kurtosis has been developed and it also works for the opposite case of decreasing kurtosis. Because of the analytical solution advantage, the methods proposed in the paper meet time restrictions critical for closed-loop operation of shaker controllers. Numerical simulations of automobile vibrations with severe time history peaks and experimental work with a complete shaker testing setup were carried out.
机译：在本文中，采用峰度控制的非高斯随机振动测试被认为是一种将真实的高峰值引入到振动器驱动信号中的方法，从而增加了励磁波峰因数。这对于地面车辆振动的更精确模拟是必需的。将峰度而不是波峰因数本身作为附加的测试规范以及PSD进行实施，会导致非高斯模拟标准的闭式表达式，并因此得到分析解决方案。对高斯信号进行多项式变换的方法很简单，但存在固有的趋势，即引入会损害PSD仿真的频率失真。由于功率谱不受相位的影响，因此IFFT相位操作方法没有这种困难。已经开发出了一种能够模拟具有高峰度的随机激励的相选择程序，它也适用于峰度减小的相反情况。由于分析解决方案的优势，本文提出的方法满足了对振动控制器的闭环运行至关重要的时间限制。对具有严重时程峰值的汽车振动进行了数值模拟，并使用完整的振动筛测试装置进行了实验工作。

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