航空学报 > 2024, Vol. 45 Issue (18): 229923-229923   doi: 10.7527/S1000-6893.2024.29923

基于场变换的非高斯随机过程快速算法

刘晋铭1,2, 谭星1,2, 陈卫婷1,2, 何欢1,2()   

  1. 1.南京航空航天大学 航空航天结构力学及控制全国重点实验室,南京 210016
    2.南京航空航天大学 振动工程研究所,南京 210016
  • 收稿日期:2023-11-29 修回日期:2023-12-13 接受日期:2024-01-24 出版日期:2024-09-25 发布日期:2024-02-02
  • 通讯作者: 何欢 E-mail:hehuan@nuaa.edu.cn

Fast algorithm for non-Gaussian stochastic processes based on translation processes

Jinming LIU1,2, Xing TAN1,2, Weiting CHEN1,2, Huan HE1,2()   

  1. 1.State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing  210016,China
    2.Institute of Vibration Engineering Research,Nanjing University of Aeronautics and Astronautics,Nanjing  210016,China
  • Received:2023-11-29 Revised:2023-12-13 Accepted:2024-01-24 Online:2024-09-25 Published:2024-02-02
  • Contact: Huan HE E-mail:hehuan@nuaa.edu.cn

摘要:

在非高斯平稳随机振动环境试验技术中,基于概率密度函数的试验技术更能精确地还原试验环境。但现有基于概率密度函数的随机信号仿真算法存在效率问题,难以在工程上应用。本文基于随机过程的场变换理论,提出了一种非高斯平稳随机过程仿真的快速算法。针对场变换理论中关键二重积分计算困难、计算速度慢的问题,对2个随机过程的相关系数函数进行级数展开,将一个含有隐式函数的复杂二重积分问题转换成一个简单的定积分问题,并利用Gauss-Hermite求积规则进行了快速求解。数值仿真验证了该方法能够在不影响仿真精度的前提下,提高非高斯平稳随机过程仿真的效率,满足了随机振动环境试验对于随机信号生成的实时性需求。

关键词: 随机振动环境试验, 非高斯平稳随机过程, 随机信号仿真, 场变换理论, 概率密度函数

Abstract:

In the non-Gaussian stationary random vibration environment testing technology, testing techniques based on probability density functions can more accurately reproduce the test environment. However, existing simulation algorithms based on probability density functions suffer from efficiency issues, making it challenging to apply them to engineering. A fast algorithm for simulating non-Gaussian stationary stochastic processes is proposed in this paper based on the translation process theory of stochastic processes. To address the difficulties and slow computation speed in critical double integral calculations of the field transformation theory, we expand the correlation coefficient functions of two random processes in series. This approach transforms a complicated double integral with an implicit function into a simple definite integral, which is efficiently solved using the Gauss-Hermite quadrature rule. Numerical simulations validate that this method can improve the efficiency of simulating non-Gaussian stationary random processes without compromising simulation accuracy, meeting the real-time requirement for generating random signals in the context of random vibration environment experiments.

Key words: random vibration testing, non-Gaussian stationary stochastic processes, stochastic signal simulation, translation processes, probability density functions

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