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利用弹簧刚度对悬挂传递函数的频移特性,提出一种车辆悬挂弹簧故障动态检测的新方法。对悬挂弹簧安装处的车体和构架垂向振动加速度信号分别进行7层谐波小波包分解,计算了8个低尺度的能量,在同一尺度上,将车体和构架的加速度能量相除得到悬挂的尺度能量传递特性,提出相邻时段对应悬挂尺度能量传递特性的比较方法,进行悬挂弹簧的故障检测。检测结果表明:当悬挂弹簧刚度蜕变时,其传递特性向高尺度变化,与检测机理分析得出的传递特性向低频率变化的分析结论一致,同时能够检测刚度蜕变10%的悬挂故障,因此,该方法可靠性高,具有一定的工程适应性。
Based on the characteristics of the spring stiffness and the frequency shift of the suspension transfer function, a new method for the dynamic detection of vehicle suspension spring failure is proposed. The vertical vibration acceleration signals of the car body and the frame are respectively decomposed by the 7th harmonic wavelet packet to calculate the energy of 8 low-scale. On the same scale, the acceleration energy of the car body and the frame is divided Suspension scale energy transfer characteristics, proposed the corresponding time interval corresponding to the energy transfer characteristics of the suspension scale comparison method, the suspension spring fault detection. The test results show that when the stiffness of the suspension spring is degenerated, the transmission characteristics of the suspension spring changes to a high degree. The result shows that the transfer characteristic of the suspension spring is consistent with the analysis result of the low frequency change and the suspension failure with 10% The method has high reliability and certain engineering adaptability.