Sensitivity control of a MR-damper semi-active suspension

Abstract

In this paper, numerical aspects of a sensitivity control for the semi-active suspension system with a magnetorheological (MR) damper are investigated. A 2-dof quarter-car model together with a 6th order polynomial model for the MR damper are considered. For the purpose of suppressing the vertical acceleration of the sprung-mass, the square of the vertical acceleration is defined as a cost function and the current input to the MR damper is adjusted in the fashion that the current is updated in the negative gradient of the cost function. Also, for improving the ride comfort, a weighted absolute velocity of the sprung-mass is added to the control law. The implementation of the proposed algorithm requires only the measurement of the relative displacement of the suspension deflection. The local stability of the equilibrium point of the closed loop nonlinear system is proved by investigating the eigenvalues of the linearized one. Through simulations, the passive suspension, the skyhook control, and the proposed sensitivity control are compared.

Development of a novel 3-DOF suspension mechanism for multi-function stylus profiling systems

“…The suspension is the most important part of the multi-function stylus profiling instrument, as it affects both the static and dynamic behavior of the measurement system [11][12][13][14][15][16] . Among the designs of the suspensions, cross-shaped 11,17 and crab-legged 18-21 flexure structures have been widely utilized to support the stylus.…”

Semi-active control of space manipulator soft contacting based on magnetorheological rotational damper

“…Firstly, its safety performance has not been proved completely in the space environment. 3 The other disadvantage is its size. In particular, the MR rotational dampers should be designed suitably to be installed into the joint motor.…”

Design and Performance Evaluation of a Rotary Magnetorheological Damper for Unmanned Vehicle Suspension Systems

“…Although electrically controlled suspension systems have been used to improve the dynamic performance of vehicles, such systems are still limited due to discontinuous damping forces, structural complexity, and high cost. To address these limitations, semiactive suspension systems with electronic-rheological (ER) and magneto-rheological (MR) fluids have been widely studied [4–7]. An MR fluid has variable yield shear stresses that depend on magnetic field intensity [8].…”