Magneto-rheological vibration damper establishing method

Abstract

The invention relates to a composite polynomial model of a magnetorheological oscillating damper and a building method thereof. In the process of building the polynomial model, the properties of the magnetorheological oscillating damper in controlling the saturation of electric current are taken into account and when fitting the relations between the polynomial coefficients and the electric current, the model is divided into a non-saturation area and a saturation area in the direction of the increasing current, wherein the polynomial coefficients and the electric current in each area are all in linear relation, and linear fitting is performed respectively. The swing and the frequency are introduced into the polynomial model so that the model coefficient can constitute a functional relationship with the product of the swing and the frequency. The polynomial model can perform accurate simulation of the non-linear dynamic property of the magnetorheological oscillating damper and the anti-model thereof is accessible; therefore, the open-loop control is easy to achieve; only a small quantity of speed property experiment data is needed to identify model parameters, and when the frequency, the swing and the electric current change, the model parameter can accurately predict the damp force of the oscillating damper without the need of change.

Description

Technical field: [0001] The invention relates to a mathematical model of a magneto-rheological shock absorber and a method for establishing the model. Background technique: [0002] The magneto-rheological shock absorber (or damper) made of new intelligent material magnetorheological fluid, its damping force can be changed steplessly, the structure is simple, no complicated driving mechanism is required, and there is no vibration, shock and noise of hydraulic valves. It only needs to consume a small amount of control energy and has a wide temperature range for stable operation, so it has broad application prospects in the fields of vehicle suspension, bridges, and anti-seismic buildings. Establishing an accurate and concise mathematical model is the key to its control. Various mathematical models have been established, typical ones are Bouc_Wen modified model, Bingham model, nonlinear viscoelastic model, nonlinear hysteresis model, S-type hysteresis model, polynomial model ...

AI Technical Summary

Problems solved by technology

Under the given displacement and voltage (or current), the force generated by the shock absorber can be easily obtained through these models, but they all have some defects: although some are simple and convenient for numerical processing, they cannot be simulated well The nonlinear dynamic characteristics of magnetorheological shock absorbers; although some models can simulate the nonlinear dynamic characteristics of magnetorheological shock absorbers well, the models are composed of strong nonlinear equations with too many parameters, which are not convenient for numerical processing. If Finding the voltage (or current) for a given displacement and force is very difficult and time consuming

[0005] The polynomial model can describe the nonlinear dynamic characteristics of the shock absorber, and can realize the reverse dynamic characteristics of the magnetorheological shock absorber in an analytical form. It is easy to obtain the required damping force in the open-loop control system, but its There are still many deficiencies. There are two main points: one is that the saturation characteristics of the magneto-rheological shock absorber for the control current cannot be considered, so the nonlinear dynamic characteristics of the shock absorber cannot be accurately described; time error becomes large

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