基于小波变换的后坐过程时-能密度分析
Wavelet Transform Post-Recoil Process Energy Density Analysis
张泽健 1张鹏军 1秦学 2赵洪运 2巩照辉 1张景坤1
作者信息
- 1. 中北大学 机电工程学院, 山西 太原 030051
- 2. 重庆长安望江工业集团有限公司, 重庆 400020
- 折叠
摘要
火炮发射后坐力是一种瞬态、非平稳、非周期性的高频信号,发射时的后坐冲击直接影响射击精度和平台的适装性.针对传统分析中后坐力峰值信号的提取不足以反映后坐过程中的频域和能量特征等问题,对测试的后坐力信号进行小波包分解,根据频带对各层信号进行重构,获得信号在不同频带内的随时间的能量分布情况.测试分析表明,测试对象的后坐能量主要集中在低频段,80.48%后坐能量集中在0～19.53 Hz,后坐力的峰值持续时间是后坐过程的3.27%,且在峰值时间内产生的冲量仅占总冲量的 1.64%.结果表明,利用基于小波变换的时-能密度分析法对后坐力信号的时域、频域特性分别进行分析,可为后坐过程评估提供新途径,也可为后坐振动抑制提供借鉴.
Abstract
The recoil of a cannon after firing is a transient,non-stationary,and non-periodic high-fre-quency signal.The recoil shock at the time of firing directly affects the shooting accuracy and platform adaptability.In view of the problems that the traditional analysis cannot reflect the frequency domain and energy characteristics of the recoil process due to the insufficient extraction of the recoil peak sig-nal,the recoil signal of the test is decomposed by wavelet packet decomposition,and the signals at each layer are reconstructed according to the frequency band to obtain the energy distribution of the sig-nal with time in different frequency bands.Test analysis shows that the recoil energy of the test object is mainly concentrated in the low-frequency band.80.48%of the recoil energy is concentrated in 0～19.53 Hz.The peak duration of recoil force is 3.27%of the recoil process,and the impulse generated during peak time accounts for only 1.64%of the total impulse.The results show that using a time-energy density analysis method based on wavelet transform to analyze the time-domain and frequency-domain characteristics of recoil force signals can provide a new way for evaluating recoil processes and provide reference for recoil buffering and suppression.
关键词
后坐力/冲击力测试/小波变换/时-能密度分析法Key words
recoil/impact force test/wavelet transform/time-energy density analysis method引用本文复制引用
基金项目
山西省基础研究计划(202203021212161)
出版年
2024
NETL
NSTL
万方数据