Abstract: Pavement roughness of airfield is one of Primary factors causing vertical vibration of travelling airplane.In order to analyses pavement dynamics,the paper studies random force generated by air plane-airfield interactions.A two-degree-of-freedom suspenaion system that is the simplificahon model of an airplane is established,through which we can express power spectral density (PSD) of pressure as following form:S_p(ω)=(k²+C2ω²)|H₁(ω)|²S_ξ (ω).Here H₁ (ω)is the property of thevibration system. Therefore, more statictical characterishcs can be obtained by this formula.

Key words: airplane, pavement of airfield, roughness, power spectral density, frequency response function, vibration system

摘要： 把机场道面平整度假设均值为零的平稳随机场,引入随机过程理论,描述了该随机场的几种统计特征,并把飞机简化为双自由度振动系统,利用频率响应函数的概念获得了飞机对不平整道面的随机动压力谱,还对实测随机动压力的方法进行了探讨.

关键词: 机场道面, 飞机, 平整度, 平稳过程, 随机动压力, 谱密度