Based on change law of contact line of helical gears, a method of calculating their time-varying stiffness was proposed.
在研究斜齿轮接触线变化规律基础上，提出了一种计算斜齿轮时变刚度的方法。
Meanwhile, the natural frequency was calculated using this method in an example, and the natural frequency affected by the change of equivalent spring stiffness was also analyzed.
结合工程实例，采用该模型计算了桩基的自振频率，分析了弹簧等效刚度的变化对模型自振频率的影响。
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