大型轧机AGC液压缸信号分析方法研究

为分析大型轧机AGC液压缸的信号,建立轧机液压AGC控制系统,以获取AGC液压缸的性能,从而量化AGC缸性能参数,以保证AGC液压缸的工作可靠性。为此分析下列参数对系统的影响伺服阀阀芯开口度、有杆腔无杆腔压力、AGC液压缸位移、和轧制力。采用基于时域数字特征的特征提取方法,并以时域信号的各种定量进行评判。以AGC缸无杆腔压力信号为例进行分析。结果表明,随着泄漏量增大AGC缸无杆腔到达150bar的时间逐渐延长,其结果分别是38.5s、46.7s、52.5s,系统响应变慢。并且AGC缸无杆腔的压力值随内泄漏故障程度增加,离散程度也逐渐增加。本文可供设计和使用人员参考。

Research on Signal Analysis of Servo Hydraulic Cylinder in Large Rolling Mill

In order to analyze the signal of AGC hydraulic cylinder of large rolling mill,the mill hydraulic control system is established to obtain the performance of AGC hydraulic cylinder,quantify the performance parameters of AGC cylinder and ensure the working reliability of AGC hydraulic cylinder.The influences of servo valve spool opening,barcavity pressure,AGC cylinder displacement and rolling force on the system are analyzed.The feature extraction method based on time domain digital features is adopted and evaluated by various quantitative methods of time domain signals.The pressure signal of AGC cylinder rodless cavity is analyzed as an example.The results show that as the leakage volume increases,the time for AGC cylinder rodless cavity to reach 150 bar gradually increases.The results are 38.5 s,46.7 s and 52.5 s respectively,and the system response becomes slower.In addition,the pressure value of AGC cylinder rodless cavity increases with the degree of internal leakage fault,and the dispersion degree also increases gradually.This paper can be used for reference by designers and users.