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Shaker Testing with Simultaneous Control of PSD and FDS

机译：振动器测试，同时控制PSD和FDS

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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.
机译：疲劳损伤频谱（FDS）模型表征损坏电位如何分布在激发频率范围内，类似于功率谱密度（PSD）如何表征激发水平的分布。然而，在内部振荡器测试期间再现操作PSD并不一定意味着，由于一些异常独特的峰值，高于来自PSD的信号的一些异常独特的峰值发生在汽车和铁路车辆的振动中。在真正的操作振动中存在这些峰值及其在基于PSD的随机检测中的缺失是由普通PSD控制获得的振动筛测试FD的原因在于形状不同，并且通常位于操作FD以下。在本文中示出了，可以通过操纵一些IFFT阶段来控制作为频率的函数的FDS形状，而不是使它们中的所有阶段进行随机来控制。由于相位操纵不影响激发PSD，因此可以同时控制FDS和PSD，其用于汽车的操作振动的示例。使用PSD + FDS控制的振动筛网测试的新概念也可用于当FDS目标需要人工增加时加速测试。可以在没有缩放PSD的情况下进行，从而避免对测试夸张因子过高的担忧。

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