应用产品质量可靠性分析方法对目前实验室常用的平底球形密度瓶存在故障及影响因素进行了分析。
The fault and influence factors existing on the flat-bottomed spherical density bottles used in the lab have been analyzed by using the analysis method of product quality reliability.
通过对循环谱密度分析方法的特性分析，指出应用循环谱密度分析方法可以在循环频率域有效提取出滚动轴承的冲击故障频率。
Based on the analytic method of cyclic spectrum density, the paper pointed out that the impact frequency could be extracted effectively with the help of scanning cyclic frequency domain.
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