Because of drawing reproduction and possible confusion and for clarity, Figure 1 – SAE J577 Vibration Test Machine drawing has been removed. Only the vibration requirements are shown.

由于复印图纸可能不够清楚而引起混淆同时为了确保清晰，图1-SAE J577震动测试仪图纸被移除。只显示震动测试要求。

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The paper makes an analysis and study on the cracks found with the bottom case of ZD6-E electric point machine in the vibration test and gives suggestion on the improvement.

本文对ZD6电动转辙机在振动试验中出现的底壳多处断裂进行了分析和研究，并提出了改进措施。

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The diesel engine is a complicated machine with many vibration sources, so the traditional vibration analysis and single parameter test method cannot determine the diagnosis accurately.

柴油机结构复杂，振源众多，常规的振动分析及单项指标测试对于故障的定位与诊断精确度不高。

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