基于S变换的热连轧机耦合振动特征提取

发布时间：2018-06-16 03:25

本文选题：热连轧机 + 耦合振动　；参考：《振动.测试与诊断》2016年01期

【摘要】：提出一种基于短时傅里叶变换的自适应频域滤波方法,将噪声信号与振动特征成功地分离。根据短时傅里叶变换和功率法设定的阀值,自动捕捉了振动信号在不同时间段的优势频率。对振动信号、压下液压缸压力信号和伺服阀给定信号做短时傅里叶变换后,热连轧机振动被诊断为液机耦合振动。利用离散小波变换和S变换相结合的方法对轧机振动信号进行分析,确定轧机起振的时间为液压压下系统的投入时间,证明了热连轧机存在液机耦合振动现象。
[Abstract]:An adaptive frequency domain filtering method based on short time Fourier transform (STFT) is proposed. The noise signal is successfully separated from the vibration feature. According to the threshold set by short-time Fourier transform and power method, the dominant frequencies of vibration signals in different time periods are automatically captured. The vibration of hot strip rolling mill is diagnosed as hydro-mechanical coupling vibration after short time Fourier transform of pressure signal of hydraulic cylinder and given signal of servo valve. The vibration signal of rolling mill is analyzed by the combination of discrete wavelet transform and S transform. It is determined that the starting time of rolling mill is the input time of hydraulic pressure down system, and it is proved that there exists the phenomenon of liquid-machine coupling vibration in hot strip mill.
【作者单位】：湖南科技大学机电工程学院;北京科技大学机械工程学院;
【基金】：国家自然科学基金资助项目(51505142)
【分类号】：TG333

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