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首页> 外文会议>International Electronics Packaging Technical Conference and Exhibition >COMPARING RANDOM VIBRATION INPUTS: POWER SPECTRAL DENSITY (PSD) VERSUS ROOT MEAN-SQUARE ACCELERATION (G{sub}(rms))
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COMPARING RANDOM VIBRATION INPUTS: POWER SPECTRAL DENSITY (PSD) VERSUS ROOT MEAN-SQUARE ACCELERATION (G{sub}(rms))

机译：比较随机振动输入：功率谱密度（PSD）与根均方加速度（G {sub}（rms））

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摘要

Many defense programs have vibration requirements for electronics which are often specified as random vibration input. Often, this input is based on measurements taken at the locations of interest for the spectrum of vehicle operating environments. The resulting specification is typically several power spectral density, or PSD, curves with associated durations. The root mean square acceleration, or G{sub}(rms), can be readily calculated for each PSD curve. G{sub}(rms) values are sometimes used to compare different PSD curves for severity. However, this can be misleading. The impacts of two different random vibration inputs, with the same G{sub}(rms) value, can be very different. By calculating fatigue damage values for various components on a circuit card assembly subjected to these inputs, it can be shown that equal G{sub}(rms) values do not result in equal damage. In fact, there can be two orders of magnitude difference in component damage values. This means that G{sub}(rms) values are very poor indicators of random vibration effect, and should not be used for comparison purposes.
机译：许多防御程序对电子设备具有振动要求，这些电子设备通常被指定为随机振动输入。通常，该输入基于对车辆操作环境频谱的感兴趣位置采取的测量。得到的规格通常是几个功率谱密度，或PSD，具有相关持续时间的曲线。对于每个PSD曲线，可以容易地计算根均方加速度或G {SUB}（RMS）。 g {sub}（rms）值有时用于比较不同的PSD曲线进行严重性。但是，这可能是误导性的。两个不同的随机振动输入的影响，具有相同的g {sub}（rms）值，可以非常不同。通过计算经过这些输入的电路卡组件上的各种组件的疲劳损伤值，可以示出等于g {sub}（rms）值不会导致相同的损坏。实际上，组件损伤值中可能有两个数量级差异。这意味着G {sub}（rms）值是非常差的随机振动效应的指标，并且不应用于比较目的。

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