Non-parametric dynamics computation method for damping force of magnetorheological fluid damper

Abstract

The invention discloses a non-parametric dynamics computation method for damping force of a magnetorheological fluid damper. According to the damping force-velocity curve obtained through experiments or engineering, the polynomial model degree is adjusted for the complexity of the hysteresis character of the damping force-velocity curve, an actual curve is divided into two parts including positive acceleration (an ascending section) and negative acceleration (a descending section), the two parts of curves are subjected to fitting, and the fitting accuracy of a model on the damping force-velocity curve is guaranteed; according to two end areas where the Runge phenomenon happens to the higher-degree polynomial, the Bingham mechanical model is adopted for fitting, and the model degree is lowered on the basis that precision is guaranteed; in combination of usage of the polynomial model and the Bingham mechanical model, the traditional situation that only the polynomial model and the Bingham mechanical model are used is improved, the model fitting precision is guaranteed, meanwhile, generation of the higher-degree polynomial Runge phenomenon is avoided, and the purpose of better fitting of the damping force-velocity characteristic curve is achieved.

Description

technical field [0001] The invention relates to the field of semi-active vibration control of high-end equipment, in particular to the design and control of a magnetorheological fluid damper based on the principle of semi-active vibration control. Background technique [0002] It is known that the magnetorheological fluid damper uses magnetorheological fluid as the medium. Under the action of an external magnetic field, the magnetorheological fluid particles change from scattered distribution to chain arrangement along the direction of the magnetic field. The external shape is semi-solid, and then shear Cut yield strength. The greater the magnetic field intensity, the greater the shear yield strength and the flow damping of the magnetorheological fluid, which in turn leads to an increase in the output damping force. The relationship between output damping force, vibration displacement and vibration velocity of magnetorheological fluid damper is an important physical index. ...

AI Technical Summary

Problems solved by technology

The Bingham model curve can reflect the working characteristics of the magnetorheological fluid damper to a certain extent, but when the damper works near the minimum vibration velocity, the modeling process ignores the influence of static friction in the damper, and the Bingham model simulates the actual working characteristics. The situation is worse

At the same time, Bingham has simplified the relationship between the output damping force and vibration velocity during the modeling process, and the model cannot reflect the hysteresis characteristics in the "damping force-velocity" curve

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