摘要
为了更好地提取在设备状态监控中振动信号的故障特征,采用Wigner高阶时频分布的方法,研究了柴油机的缸套活塞在不同磨损情况下振动信号的平滑切片Wigner三谱。实验结果显示:从柴油机磨损初期阶段到后期阶段的过程中,爆燃阶段振动信号的平滑切片Wigner三谱清楚地说明信号的能量逐渐向宽频带范围扩散,且持续时间逐渐减小。在磨损程度和故障特征之间建立了映射关系,进一步说明通过Wigner高阶矩谱可以有效地对非平稳、非高斯振动冲击信号进行特征提取和检测,验证了该方法在故障特征提取中具有很好的应用潜力。通过该方法可以提取有价值的关于冲击信号的时间和谱特性的量化信息。
To accurately obtain the characteristics of fault from vibration signals during equipment monitoring, a Wigner higher order time-frequency distribution methodology is used to investigate the vibration signal＇s tre-spectrum of smoothing section under different wearing conditions of the diesel engine＇s piston. The study shows that the smoothing section Wigner We-spectrum of vibration signals at deflagration stage indicates that the signal＇s energy spread toward the broadband and the lasting time decreases gradually. The mapping relationships between wear degree and fault characteristics are established, which further reveals that Wigner higher order moment spectrum can be used to effectively extract and test non-stationary, non-Gaussian vibration signals. Experimental results prove that the method has potential in obtaining the characteristics of mechanical fault and can be used to extract the quantitative information on the time-frequency features of impact signal.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2009年第3期424-426,共3页
Journal of Liaoning Technical University (Natural Science)
基金
河北省教育厅科学研究指导项目基金资助项目(Z2004467)
关键词
切片Wigner高阶矩谱
故障诊断
冲击信号
柴油机
slice Wigner higher order moment spectrum
fault diagnosis
impulse signals
diesel engine
