Abstract：For the all-channel effective magnetorheological damper ( MRD ), the shear yield stress of magnetorheological fluid in damping channel will change with the change of position. In the design stage of MRD structure, the quasi-static model is often used to represent the relationship between the size of MRD structure and the damping force, and to predict the output damping force of the damper. Traditional quasi-static models usually assume that the magnetorheological fluid's shear yield stress in the damping channel is equal everywhere, so its accuracy is low, which does not conform to the magnetic circuit characteristics of the all-channel effective MRD. Based on the above problems, a novel adaptive segmental quasi-static modeling method is proposed, which considers the relationship between the magnetorheological fluid's shear yield stress and the position of the damping channel. This method first uses the overall low-order fitting for the magnetic field strength of the damping channel and divides the low-order fitting result into 0/1 states according to the set error threshold, completing the segmental fitting at last. This paper analyzed circuit characteristics of all-channel effective MRDs by electromagnetic finite element simulation. The novel quasi-static models for two all-channel effective MRDs with different structures are established. Finally, the rationality and accuracy of the novel quasi-static model are verified by a damping characteristic test.
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