基于Gabor阶次跟踪的城市客车座椅振动特性分析
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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.
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.
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.
引文
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[3]Pan Min-Chun,Chiu Chun-Ching.Investigation on im-proved Gabor order tracking technique and its applica-tions[J].Journal of Sound and Vibration,2006,295(3/4/5):810-826.
[4]Pan Min-Chun,Liao Shiu-Wei,Chiu Chun-Chin.Im-provement on Gabor order tracking and objective com-parison with Vold-Kalman filtering order tracking[J].Mechanical System and Signal Processing,2007,21(2):653-667.
[5]汤宝平,何启源,魏玉果,等.基于角加速度的复合计算阶次跟踪方法[J].机械工程学报,2008,44(8):143-147.Tang Baoping,He Qiyuan,Wei Yuguo,et al.Hybrid computed order tracking method based on angular accel-eration[J].Chinese Journal of Mechanical Engineering,20084,4(8):143-147(in Chinese).
[6]Albright M F,Qian S.A Comparison of the Newly Pro-posed Gabor Order Tracking Technique vs Other Order Tracking Methods[EB/OL].http/:/www.sandv.com/downloads/0306qian.pdf2,001-05-01.
[7]Qian Shie.Gabor expansion for order tracking[J].Sound and Vibration2,0033,7(6):18-22.
[8]Shao HJ,in W,Qian S.Order tracking by discrete Gabor expansion[J].IEEE Transactions on Instrumentation and Measurement,2003,52(3)7:54-761.
[9]Qian Shie.Introduction to Time-Frequency and Wavelet Transforms[M].Beijing:China Machine Press,2005.
[10]蒋开洪,徐驰,上官文斌.汽车动力总成悬置动态特性及悬置系统振动控制设计[J].汽车研究与开发,2005(10):38-43.Jiang Kaihong,Xu Chi,Shangguan Wenbin.Dynamic characteristic and vibration control design of a powertrain mounting system[J].Automobile Research and Devel-opment,2005(10):38-48(in Chinese).
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