非高斯随机振动的分析基础  

Analytical basis for the synthesis of non-Gaussian random vibration

作　　者：吴家驹[1] 张鹏飞[1] 胡亚冰 WU Jiaju;ZHANG Pengfei;HU Yabing(Beijing Institute of Structure and Environment Engineering, Beijing 100076, China)

机构地区：[1]北京强度环境研究所,北京100076

出　　处：《强度与环境》2018年第2期1-8,共8页Structure & Environment Engineering

基　　金：国家自然科学基金(11502023;11502024)

摘　　要：本文试图建立非高斯随机振动综合的分析基础。分析了基于运载火箭外场振动环境的形成机理,用乘积模型关联了非高斯随机波形的表征、分解与重构。典型的振动载荷包括火箭噪声、压力振荡和路面不平引起的随机振动。时间历程的功率谱、峭度和跌宕周期作为形成非高斯随机波形的控制参数。通过以累积损伤为判据的数字仿真,比较了不同重构信号的模拟程度。结果表明基于β分布随机数排序生成非高斯振动的模拟效果与原信号的最接近。This paper make a study of the analytical basis for the synthesis of non-Gaussian vibration. The product formula is used for relating characterization and simulation of the non-Gaussian signal, base on creating mechanism of carrier rocket field vibration environment. The typical vibration loads include the random vibration from rocket noise, pressure shock and road irregularities. The power spectral density, kurtosis and roll period of typical time history is used to control parameter for generating non-Gaussian random wave. By cumulative damage criterion via numerical simulations, the simulation degree of very reform signal is compared. As a result, the simulation effect of non-Gaussian signals generating by the rearrangement technique of β distribution random number is close to effect of the original signal.

关 键 词：运载火箭 随机振动 非高斯 乘积公式 峭度 跌宕周期 疲劳损伤谱 

分 类 号：V415.5[航空宇航科学与技术—航空宇航推进理论与工程] TB533.3[理学—物理]