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Synthesis of Sine-on-Random vibration profiles for accelerated life tests based on fatigue damage spectrum equivalence

机译：基于疲劳损伤谱当量的正弦随机振动曲线合成，用于加速寿命测试

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In many real life environments, mechanical and electronic systems are subjected to vibrations that may induce dynamic loads and potentially lead to an early failure due to fatigue damage. Thus, qualification tests by means of shakers are advisable forthe most critical components in order to verify their durability throughout the entire life cycle. Nowadays the trend is to tailor the qualification tests according to the specific application of the tested component, considering the measured field data as reference to set up the experimental campaign, for example through the so called "Mission Synthesis" methodology. One of the main issues is to define the excitation profiles for the tests, that must have, besides the (potentially scaled) frequency content, also the same damage potential of the field data despite being applied for a limited duration. With this target, the current procedures generally provide the test profile as a stationary random vibration specified by a Power Spectral Density (PSD). In certain applications this output may prove inadequate to represent the nature of the reference signal, and the procedure could result in an unrealistic qualification test. For instance when a rotating part is present in the system the component under analysis may be subjected to Sine-on-Random (SoR) vibrations, namely excitations composed of sinusoidal contributions superimposed to random vibrations. In this case, the synthesized test profile should preserve not only the induced fatigue damage but also the deterministic components of the environmental vibration. In this work, the potential advantages of a novel procedure to synthesize SoR profiles instead of PSDs for qualification tests are presented and supported by the results of an experimental campaign.
机译：在许多现实生活环境中，机械和电子系统受到的振动可能会引起动态载荷，并可能由于疲劳损坏而导致早期故障。因此，建议对最关键的部件使用振动筛进行鉴定测试，以验证其在整个生命周期中的耐久性。如今的趋势是根据被测组件的具体应用来定制资格测试，例如，通过所谓的“任务综合”方法，将测得的现场数据作为建立实验活动的参考。主要问题之一是定义测试的激励曲线，除了（可能按比例缩放的）频率内容外，还必须具有有限的持续时间，但场数据也具有相同的潜在破坏潜力。对于这个目标，当前程序通常以功率谱密度（PSD）指定的固定随机振动形式提供测试曲线。在某些应用中，该输出可能不足以表示参考信号的性质，并且该过程可能导致不切实际的鉴定测试。例如，当系统中存在旋转部件时，受分析的组件可能会受到随机正弦（SoR）振动的影响，即由正弦贡献组成的激励叠加到随机振动上。在这种情况下，合成的测试曲线不仅应保留引起的疲劳损伤，还应保留环境振动的确定性分量。在这项工作中，提出了一种新的合成SoR配置文件而不是PSD进行资格测试的程序的潜在优势，并得到了实验活动的支持。

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