摘要
高阶时频分布是高阶统计量与时频分布相结合的产物,适合于分析具有非平稳、非线性特点的汽油机信号。引入高阶时频分布,采用二阶、三阶、四阶矩谱,也称Wigner谱、Wigner双谱、Wigner三谱对一仿真信号进行分析对比发现:在多分量信号的识别上,应用CWD滤波后的Wigner三谱是1种较好的分析工具。将该方法应用于汽油机故障诊断的结果表明:谱的切片图能清晰分辨汽油机不同磨损状态下的故障信号,较好地实现了故障诊断目的。
Higher-order time-frequency distribution （HOTFD） is the product which is combined by higher-order statistics and time-frequency distribution, it is suitable for analyzing non-stationary and non-linear signals. According to signal characteristics of gasoline engine, HOTFD was introdued, including the second-order,third-order,the four-order moment spectrum, which is also called Wigner spectrum, Wigner bispectrum,. Wigner trispectrum. The analysis for a simulated signal indicates that the Wigner Trispectrum with Choi Williams filter （SWTCWD） is a better analyzing tool for multi-component signals. The method was applied to gasoline engine fault diagnosis, the results show that SWTCWD can clearly distinguish fault signals of different gasoline engine with different wear state, so that it can better diagnose the engine fault.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2009年第1期80-83,共4页
Chinese Internal Combustion Engine Engineering
关键词
内燃机
汽油机
故障诊断
Wigner谱
高阶时频分布
IC engine
gasoline engine
fault diagnosis
Wigner distribtion
higher-order time-frequency distribtion
