用循环计数法求出载荷及应力幅频率分布，用概率密度函数拟合，为疲劳设计提供可靠性高的数据资。
The loads and the distribution of stress amplitude frequency are obtained by cycle count and reliable data for fatigue design are provided by probability density function fit.
校核了主轴在循环载荷下的疲劳强度，为主轴的失效分析和优化设计提供了可靠的理论依据。
After checking the spindle's fatigue strength which suffered from a circulating load, it can provide reliable theoretical basis for failure analyzing and optimization designing of the spindle.
通过对广泛应用于机械设计中的非对称循环下构件疲劳强度条件的分析，提出了存在的问题。
Through analysis and calculation of the fatigue strength condition of component parts this paper discovers the erratam and analyses the reason.
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