基于S变换的内燃机气缸盖振动特性研究  

Study on Vibration Characteristics of Internal Combustion Engine Cylinder Head Based on S Transform

作　　者：徐红梅[1] 郝志勇[1] 贾维新[1] 景国玺[1] 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027

出　　处：《内燃机工程》2008年第3期68-71,75,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(50575203)

摘　　要：介绍了S变换的基本原理。设计了仿真试验，对比分析短时傅立叶变换，连续小波变换以及S变换的时频分析能力。结果表明，S变换是一种更加有效的非稳态信号时频分析方法。采用S变换对灭缸前后气缸盖侧面振动信号进行时频分析发现，信号能量主要集中于4～6．4kHZ的高频区域，在曲轴转角方向上，4～6．4kHZ的频带成分持续间断出现，其出现位置和间隔与振动信号各冲击响应相对应。研究表明，S变换具有较好的时频定位能力，可用于内燃机气缸盖振动特性研究。The basic principles of S transform were briefly introduced. To compare the time-frequency analysis capability of S transform, short time Fourier transform and continuous wavelet transform, a simulation experiment was performed. The simulation results show that S transform is a more effective method for the time-frequency analysis of nonstationary signals. The time-frequency analysis of vibration signals from cylinder head side before and after engine misfire was conducted by using S transform. The analysis results show that the signal energy is mainly concentrated in the high frequency region of 4-6.4 kHz, which continues with intermittency along the crank angle. The location and spacing just corresponds to each impulse response of vibration signal. Research shows that S transform behaves itself with better time-frequency positioning capability. It is feasible to adopt S transform to investigate the vibration characteristics of engine cylinder head.

关 键 词：内燃机 气缸盖 S变换 时频分析 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]