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就直升机振动周期分量的随机性及导弹发射振动的随机性进行了讨论。对周期分量的随机性，采用频域正弦、随机分离技术作统计分析，发现定常飞行状态下，周期分量为确定性量，随机波动由测量和分析噪声引起；非定常飞行状态下，由于流场的随机性及旋翼有较大的操纵量变化，周期分量为随机变量，符合正态分布。对导弹发射引起的非平稳随机振动，发现可通过数学建模及滤波分离求得该过程基本的时变数字特征，通过能谱分析可获得对减震装置减震效果的定量评价。
The randomness of helicopter vibration cycle components and the randomness of missile launch vibration are discussed. For the randomness of periodic components, using the frequency domain sinusoidal and random separation techniques for statistical analysis, it is found that the periodic components are deterministic under the condition of steady flight, and the random fluctuations are caused by the measurement and analysis of noise. Under unsteady flight conditions, The randomness of the rotor and the rotor have larger control variables, and the periodic components are random variables, which are in accordance with the normal distribution. The nonstationary random vibration caused by the launch of a missile shows that the basic time-varying digital characteristics of the process can be obtained through mathematical modeling and filtering separation. The quantitative evaluation of the damping effect of the shock-absorbing device can be obtained by energy spectrum analysis.