Vibration suppression method and system of a rolling mill roller assembly based on a vibration damping device

A vibration suppression method of a rolling mill roller assembly based on a vibration damping device, wherein, comprising following steps:

• S1:
• obtaining a first amplitude-frequency relationship during a vibration process of a rolling mill roller assembly vibration suppression system;
• S2:
• based on the first amplitude-frequency relationship, determining two time domain relationships and two second amplitude-frequency relationships by a simulation analysis, wherein the two time domain relationships are corresponding to a working state and a non working state of the rolling mill roller assembly vibration suppression system, and the two second amplitude-frequency relationships are corresponding to the working state and the non working state of the rolling mill roller assembly vibration suppression system;
• S3:
• based on the two time domain relationships and two second amplitude-frequency relationships, adjusting parameters of the vibration damping device until a vibration displacement of the rolling mill roller assembly vibration suppression system is less than or equal to a vibration displacement threshold;
• wherein, S1 comprises following steps:
• S11:
• establishing a simplified model corresponding to the rolling mill roller assembly vibration suppression system;
• wherein the vibration damping device is a kind of passive vibration damping device that connects a magnetorheological (MR) damper to an end of the rolling mill of the rolling mill roller assembly through sleeves and a bearing, and then connects a mass block to the MR damper through an elastic element and a damping element, after the vibration damping device is installed on the rolling mill roller assembly, a freedom system with two degrees is formed;
• S12:
• calculating a corresponding relationship of the freedom system with two degrees of the rolling mill roller assembly vibration suppression system based on the simplified model;
• S13:
• performing a data processing to the freedom system with two degrees by a multiscale method, to obtain the first amplitude-frequency relationship;
• wherein, S12 comprises following steps:
• S121:
• obtaining an equivalent mass of the lower rolling mill roller assembly, an equivalent mass of the mass block of a passive damper corresponding to the vibration damping device, and an equivalent damping between the lower rolling mill roller assembly and a rolling piece, and an equivalent linear stiffness, and an equivalent nonlinear stiffness, and an equivalent damping and an equivalent stiffness of the lower rolling mill roller assembly and the passive damper;
• S122:
• calculating a corresponding relationship of the freedom system with two degrees of the rolling mill roller assembly vibration suppression system based on the equivalent mass of a lower rolling mill roller assembly, the equivalent mass of the mass block of the passive damper, and the equivalent damping between the lower rolling mill roller assembly and the rolling piece, and the equivalent linear stiffness, and the equivalent nonlinear stiffness, and the equivalent damping and the equivalent stiffness of the lower rolling mill roller assembly and the passive damper;
• wherein, S3 comprises following steps:
• S31:
• determining a corresponding relationship between the parameters of the vibration damping device and the two second amplitude-frequency relationships by the simulation analysis;
• S32:
• based on the two time domain relationships and the corresponding relationship between the parameters of the vibration damping device and the two second amplitude-frequency relationship, adjusting the parameters of the vibration damping device until the vibration displacement of the rolling mill roller assembly vibration suppression system is less than or equal to the vibration displacement threshold;
• wherein the parameters of the vibration damping device comprises an initial damping force and damping force adjustable multiplying powers of the MR damper of the vibration damping device, a damping force and an inherent time delay of the passive damper of the damping device.