Shaker Testing with Simultaneous Control of PSD and FDS

Q4 Engineering Journal of the IEST Pub Date : 2020-12-01 DOI:10.17764/1557-2196-63.1.21
A. Steinwolf
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Abstract

The fatigue damage spectrum (FDS) model characterizes how the damage potential is distributed over the excitation frequency range, similarly to how the power spectral density (PSD) characterizes the distribution of the excitation level. However, reproducing the operational PSD during in-house shaker testing does not necessarily mean that the FDS would be also reproduced because some unusually distinctive peaks, higher than those in a signal generated from the PSD, occur in vibrations of automobiles and railway vehicles. Presence of these peaks in real operational vibrations and their absence in the PSD-based random testing is the reason why the shaker testing FDS obtained by the ordinary PSD control is different in shape and usually lies below the operational FDS. It is shown in this paper that the FDS shape as a function of frequency can be controlled by manipulating some of the IFFT phases instead of making all of them random. Since the phase manipulation does not affect the excitation PSD, the FDS and the PSD can be controlled simultaneously, which is demonstrated for an example of operational vibrations of an automobile. This new concept of shaker testing with the PSD+FDS control can also be used for accelerated testing when the FDS target needs to be artificially increased. It can be done without scaling up the PSD, thereby avoiding concerns about the test exaggeration factor being too high.
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同时控制PSD和FDS的激振器试验
疲劳损伤谱(FDS)模型表征了潜在损伤在激励频率范围内的分布,类似于功率谱密度(PSD)表征激励水平分布的方式。然而,在内部振动台测试期间再现操作PSD并不一定意味着FDS也会被再现,因为汽车和铁路车辆的振动中会出现一些异常独特的峰值,这些峰值高于PSD产生的信号中的峰值。在实际操作振动中存在这些峰值,而在基于PSD的随机测试中不存在这些峰值是通过普通PSD控制获得的振动台测试FDS在形状上不同并且通常位于操作FDS之下的原因。本文表明,作为频率函数的FDS形状可以通过操纵一些IFFT相位来控制,而不是使所有相位都是随机的。由于相位操纵不影响激励PSD,因此可以同时控制FDS和PSD,这是以汽车运行振动为例进行演示的。当需要人为增加FDS目标时,这种带有PSD+FDS控制的振动台测试的新概念也可以用于加速测试。它可以在不放大PSD的情况下完成,从而避免了对测试夸大因子过高的担忧。
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来源期刊
Journal of the IEST
Journal of the IEST Engineering-Safety, Risk, Reliability and Quality
CiteScore
0.40
自引率
0.00%
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0
期刊介绍: The Journal of the IEST is an official publication of the Institute of Environmental Sciences and Technology and is of archival quality and noncommercial in nature. It was established to advance knowledge through technical articles selected by peer review, and has been published for over 50 years as a benefit to IEST members and the technical community at large as as a permanent record of progress in the science and technology of the environmental sciences
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