关键词: 磁栅尺, 结构动力学分析, 热连轧机, 振动抑制

Abstract: The roller gap displacement sensor is the feedback link of automatic gauge control (AGC) system. The feedback signal of roller gap displacement is subjected to the intense influence of dynamic characteristic of sensor structure, even endangers the stability of the rolling process. The modal parameters may describe the structure dynamic characteristic completely. Therefore, in the phase of the structure dynamic design and the structure dynamics modification, effective dynamic analysis must be carried out. Vibration test of the roller gap displacement sensor structure is carried out by using the one-point excitation and multi-point acceleration response. Based on the experimentation modal analysis theory, the modal parameters of the sensor structure are extracted by using the least square complex exponent (LSCE) method, and the analysis result is discussed. It indicates that the vertical vibration modal frequency of sensor crust is close to the vertical vibration modal frequency of the hot rolling mill stand, forming vibration coupling to the rolling mill stand, whose dynamic characteristic will jeopardize the stability of the rolling process. The analysis results have important significance in establishing simulation model of the rolling mill press down system as well as in carrying out structure dynamics modification.

Key words: Hot rolling mill, Magnetic grid gauge, Structure dynamics analysis, Vibration suppression