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研究了火箭发射导轨随机不平度的规律，用实测样本得到轨面随机不平度的功率谱密度函数；用傅里叶变换确定等效的由谐波函数叠加而成的准随机函数；把它作为导轨不平度的原函数计算火箭在其上运动时的动载荷．这种计算方法明显优于以往将导轨当作某种确定性函数所得的结果．
The rule of random irregularity of rocket launching track was studied. The power spectral density function of random irregularity of track surface was obtained with measured samples. The quasi-random function equivalent to superposed harmonic function was determined by Fourier transform. The original function of the rail roughness is to calculate the dynamic load of the rocket when it is moving. This method of calculation is significantly better than the previous rail as a result of certain deterministic functions.