基于幅值调制的炮击振动实验室模拟方法  

A New Laboratory Simulation Method of Gunfire Vibration

作　　者：蔡涵翔 袁宏杰[1] 徐俊[2] CAI Han-xiang;YUAN Hong-jie;XU Jun(School of Reliability and Systems Engineering,Beihang University,Beijing 100083,China;China Aero-Ploytechnology Establishment,Beijing 100028,China)

机构地区：[1]北京航空航天大学,北京100083 [2]中国航空综合技术研究所,北京100028

出　　处：《强度与环境》2022年第3期52-57,共6页Structure & Environment Engineering

摘　　要：现有的炮击振动信号模拟方法基于平稳、高斯分布的振动,模拟了自功率谱密度等低阶统计特征。但炮击振动信号具有非平稳、非高斯特点,对于这类具有瞬态重复特性炮击振动信号的高阶特征模拟问题,基于目标峭度值与指数函数迭代计算指数参数值并生成调制信号,对平稳高斯信号进行幅值调制后生成炮击振动模拟信号。在实例验证中,通过对比炮击振动模拟信号与实测炮击信号的功率谱密度(PSD)、峭度值、疲劳损伤谱、冲击响应谱验证了方法的有效性。The existing simulation method of gunfire vibration signal simulated the time domain characteristics and the low-order statistical characteristics such as mean and variance.While the signal’s high-order characteristics were ignored.To solve the high-order characteristic simulation problem of non-stationary,non-Gaussian gunfire vibration signals with transient repetitive pulse characteristics,the modulation signal was constructed by exponential function.The exponential parameter value was iteratively calculated based on the target kurtosis value to generate the modulation signal.The Gaussian signal was amplitude modulated to generate the gunfire vibration simulation signal.The effectiveness of the method is verified by comparing the power spectral density(PSD),kurtosis,fatigue damage spectrum and shock response spectrum of the simulated and measured gunfire vibration signals.

关 键 词：炮击振动 峭度 近似模拟方法 指数函数 调制信号 

分 类 号：V414.33[航空宇航科学与技术—航空宇航推进理论与工程]