本文用渐近法求出了非线性悬架系统固有频率的计算公式,讨论了根据振幅的变化范围来确定非线性悬架系统的固有频率域的问题。由于非线性振动只有极少数特殊问题才有精确解,因此文中给出的固有频率计算公式是近似的。通过对一个例子求精确解和近似解,分析了近似公式的计算精度。 In this paper, the asymptotic method is used to calculate the natural frequency of the nonlinear suspension system. The problem of determining the natural frequency domain of the nonlinear suspension system is discussed based on the variation range of the amplitude. Since the nonlinear vibration has an exact solution with only a few special problems, the formula for calculating the natural frequency given in this paper is approximate. Through an example of exact solution and approximate solution, the approximate accuracy of the formula is analyzed.