锤片式粉碎机转子系统的模态分析

Modal analysis for the rotor system of hammer mill

为了研究锤片式粉碎机在启动过程中转子的动态响应规律,利用ANSYS软件对粉碎机转子系统进行模态分析,得到了转子部分的前六阶模态振型,并根据模态振型的固有频率得出了转子系统的前六阶临界转速。结果表明转子部分的第二阶临界转速在额定转速范围内,因此粉碎机在工作时应尽量避开这个转速;测得转子部分在不同支承刚度条件下前三阶振型的固有频率和最大相对位移,分析了前三阶振型的固有频率和最大相对位移随支承刚度的变化规律,认为转子系统应使用支承刚度较小的滚动轴承。研究为锤片式粉碎机转子组的动态特性分析和减振降噪设计提供了理论依据。

In order to study the dynamic response law of the rotor of the hammer mill during start-up process,the modal analysis has been carried out to the rotor system by ANSYS software,and the first six-order mode shape of the rotor part has been obtained.The first six critical speed of the rotor system has been given according to the natural frequency of the modal shape.The results show that the second-order critical speed of the rotor part is within the rated speed range.Therefore,the mill should avoid this speed when working.The natural frequency and maximum relative displacement of the first three-order mode have been measured under different support stiffness conditions.The changing law of natural frequency and the maximum relative displacement of the first three modes with variation of support stiffness has been analyzed.It is considered that the rotor system should use rolling bearings with less support stiffness.It provides a theoretical basis for the dynamic characteristics analysis and the design of vibration and noise reduction of the rotor group of the hammer mill.