趋势项误差的低频极限特征理论模型与处理方法研究  

A low frequency limit theoretical model and a processing method of trend error

作　　者：王乾勋[1,2] 闫明 杜志鹏[2] 张玮[2] 李营[2] WANG Qianxun;YAN Ming;DU Zhipeng;ZHANG Wei;LI Y-ing(Mechanical Engineering School,Shenyang University of Technology,Shenyang 100870,China;Naval Academy of Armament,Beijing 100161,China)

机构地区：[1]沈阳工业大学机械工程学院,沈阳100870 [2]海军装备研究院,北京100161

出　　处：《振动与冲击》2018年第12期239-243,共5页Journal of Vibration and Shock

基　　金：青年科学基金项目(51209215)

摘　　要：针对冲击信号中趋势项误差造成的冲击谱低频失真问题,建立了趋势项误差的低频极限特征理论模型,解释了趋势项产生冲击谱低频失真的原因。据此设计一种基于指数衰减的趋势项误差消除方法;对含趋势项误差的实船水下爆炸冲击信号进行了处理。结果表明,此方法对冲击谱低频修正效果明显,在0.1~10 Hz滚降率提高近38 d B/oct,且对不包含趋势项误差的中高频段的冲击谱影响较小,可以用于舰艇水下爆炸冲击加速度信号趋势项误差的修正。To explain the reason of shock response spectrum distortion at low frequency,caused by the trend error in the shock signal,a low frequency trend error limit model was established. An exponential-based decay trend error correction method was designed,and the method was used in the ship underwater explosion shock signal which involved trend error. The results show that the method has a significant effect on the low frequency of the shock spectrum. The rolloff rate of the shock wave is improved by nearly 38 d B/oct during 0. 1-10 Hz. The influence on the the middle and high frequency with small error is light. Therefore,the method can be used to correct the trend error of the underwater explosion shock acceleration signal.

关 键 词：水下爆炸 趋势项 冲击谱 理论模型 指数衰减 

分 类 号：U666.16[交通运输工程—船舶及航道工程]