【摘要】 简要比较了目前主要的几种阶次分析技术的特点.将Gabor阶次跟踪技术用于加速过程座椅振动响应信号的分析,先采用适当的参数对信号进行Gabor变换得到时频谱图,接着对主要能量阶次进行时频遮罩,提取出相应的Gabor系数,然后用这些系数进行Gabor重构,得到阶次波形.从时域波形上的幅值峰值所在位置确定了座椅共振频率及相应发动机转速,提出了相应的减振措施.实际应用表明,Gabor阶次跟踪技术对于加速过程座椅振动响应信号的特征提取是有效的.更多还原

【Abstract】 Characteristics of several predominant order tracking(OT) techniques were briefly compared.The Gabor order tracking(GOT) technique was used to analyze the run-up vibration signals from the seats of a city bus.The Gabor transformations with appropriate parameters were performed on the signals first to obtain the Gabor coefficient spectrum,and the spectrum was then time-frequency masked to extract the corresponding coefficients for the most significant orders.The order waveforms were then reconstructed with those coefficients.From the amplitude peak positions of the reconstructed time waveform,the seats’ resonance frequencies and the corresponding engine speeds were identified and the measures to reduce vibration were put forward.The real application shows that Gabor order tracking technique is effective for characteristics extraction of run-up vibration signals of city bus seats.更多还原