摘要
针对柴油机振动信号的非线性特征,将小波变换与分形理论结合;由此进行缸盖振动信号的分析及故障特征的提取,进而对柴油机气阀间隙异常故障进行诊断。随后计算信号小波包频带盒维数、小波变换模极大及信号的多重分形谱。结果表明,这种将分形维数和多重分形谱的结构作为系统的衡量指标和故障的表征参数,使诊断结果简单、现实可行。
Wavelet transform and fractal theory was combined and applied to the analysis of the cylinder-head vibration signal of diesel engines and the extraction of the fault features according to the nonlinearity of the vibration signal.The fault of abnormal valve clearance of the diesel engine was diagnosed.The dimension of wavelet-packet frequency-band box,the maximum wavelet transform module and the multi-fractal spectrum of the vibration signal were calculated.The results show that the fractal dimension and the multi-fractal spectrum can be employed as a system measure and a fault characteristic parameter so as to make the diagnosis simple,practical and feasible.
出处
《噪声与振动控制》
CSCD
2013年第4期64-67,共4页
Noise and Vibration Control
基金
国家自然基金资助项目(21106058)
江苏省自然科学基金项目(BK2012278)
关键词
振动与波
柴油机
故障诊断
小波变换
分形盒维数
多重分形谱
vibration and wave
diesel engine
fault diagnosis
wavelet transform
box dimension
multifractal spectrum
