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首页> 外文会议>International Conference on Vibration Measurements by Laser and Noncontact Techniques >Displacement Measurement on Specimens Subjected to Non-Gaussian Random Vibrations in Fatigue Life Tests
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Displacement Measurement on Specimens Subjected to Non-Gaussian Random Vibrations in Fatigue Life Tests

机译：对疲劳寿命试验中非高斯随机振动进行试样的位移测量

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High-cycle fatigue life tests conducted using controlled random vibrations are commonly used to evaluate failure in components and structures. In most cases, a Gaussian distribution of both the input vibration and the stress response is assumed, while real-life loads may be non-Gaussian causing the response to be non-Gaussian as well. Generating non-Gaussian drive signals with high kurtosis and a given power spectral density, however, does not always guarantee that the stress response will actually be non-Gaussian, because this depends on the adherence of the tested system to the Central Limit Theorem. On the other side, suitable measurement methods need to be developed in order to estimate the stress amplitude response at critical failure locations, and therefore to evaluate and select input loads. In this paper, a simple test rig with a notched cantilevered specimen was developed to measure the response and examine the kurtosis values in the case of stationary Gaussian, stationary non-Gaussian, and non-stationary non-Gaussian excitation signals. The Laser Doppler Vibrometry (LDV) technique was used for the first time in this type of test, to estimate the specimen stress amplitude response in terms of differential displacement at the notch section ends. A method based on the use of accelerometers to correct for the occasional signal drops occurring during the experiment is described and the results are discussed with respect to the ability of the test procedure to evaluate the output signal.
机译：使用受控随机振动进行的高循环疲劳寿命测试通常用于评估部件和结构中的失效。在大多数情况下，假设输入振动和应力响应的高斯分布，而现实寿命负载也可能是非高斯，导致响应是非高斯的。然而，生成具有高峰度的非高斯驱动信号和给定的功率谱密度并不总是保证应力响应实际上是非高斯的，因为这取决于测试系统对中央极限定理的依从性。在另一边，需要开发合适的测量方法，以便在关键故障位置处估计应力幅度响应，从而估计并选择输入负载。在本文中，开发了一种简单的试验台，具有缺口悬臂标本的响应，并在静止高斯，固定的非高斯和非静止非高斯激励信号的情况下检查峰值值。在这种类型的测试中首次使用激光多普勒振动器（LDV）技术，以估计凹口部分末端的差分位移方面的样本应力幅度响应。描述了一种基于使用加速度计的方法来校正在实验期间发生的偶尔信号下降，并且关于测试过程评估输出信号的能力讨论了结果。

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