侵彻过程弹体结构响应频率特性的分析方法  

Projectile Structural Response Frequency Characteristics Analysis Method in Penetration Process

作　　者：郝慧艳[1,2,3] 李晓峰[3] 孙运强[1,2] 刘明杰[3] 

机构地区：[1]中北大学电子测试技术国家重点实验室,太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,太原030051 [3]北京理工大学机电工程学院,北京100081

出　　处：《振动．测试与诊断》2013年第2期307-310,343,共4页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(61171177);山西省青年科技研究基金资助项目(201202013-5)

摘　　要：为了研究侵彻过程中弹体结构响应的频率特性,通过建立弹体的有限元模型,利用弹体结构模态分析求解得到弹体的固有频率和振型,并对弹体进行谐响应分析,得到弹体在侵彻阻力作用下达到共振时的频率。针对侵彻加速度信号是非平稳时变信号,采用总体经验模态分解算法对实测的侵彻信号进行分解,找到与谐响应分析获得的共振频率相对应的分量,从而估计出弹体结构响应的对应频率。通过对实测的侵彻4层混凝土靶板的加速度信号分析,分解出的第3阶固有模态函数分量频率与谐响应分析所得弹体结构响应共振频率的相对误差为4.2%,该分量为弹体结构响应加速度信号,从而得到该实验弹在侵彻过程中弹体结构响应的频率。To study the projectile structural response frequency characteristic,through established finite element model of the projectile,the natural frequencies and mode shapes of the projectile is solved using the projectile structural modal analysis.And resonance frequency which is under penetration resistance is obtained using the harmonic response analysis.Penetration acceleration signal is non-stationary and time-varying.In order to accurately estimate the corresponding frequency response of the structure of the missile body,ensemble empirical mode decomposition algorithm is used to analyze penetration acceleration signal and find a component which corresponds to the harmonic response analysis resonant frequency.Through analysis the measured penetration four-tiers concrete target acceleration signals,the IMF3(the third intrinsic mode functions) component frequency is consistent with the natural frequency of projectile structural response income by harmonic response analysis and frequency error is 4.2%.So the IMF3 component is projectile structural response of the acceleration signal and obtains the frequency of projectile structure response.

关 键 词：弹体响应 模态分析 谐响应 总体经验模态分解 

分 类 号：TJ012.4[兵器科学与技术—兵器发射理论与技术] TN911.6[电子电信—通信与信息系统]