Abstract
A cab seat suspension with a magneto-rheological (MR) fluid damper is introduced in this paper. A unified-format model for the MR damper is proposed to describe the dynamic characteristics of the MR damper. Also, a simple force-inverse model and a viscous damping tracking model are used for the coil current solution. A digital integrator and an extended Kalman filter are respectively adopted to obtain the vibration velocity of the chair frame and the relative motion velocity of the MR damper piston. A new skyhook control base with viscous damping tracking is applied to the semi-active seat suspension. In the simulation, compared with passive seat suspension under different displacement excitation (2, 4, 6, 8 Hz-sine, and random), the acceleration root mean square of the seat suspension with the MR damper is reduced by 52.2%, 32.2%, 41.3%, 50.8%, and 34.6%, respectively. In the experiment, the acceleration root mean square is reduced by 11.2%, 41.2%, 45.8%, and 31.5%, respectively under different displacement excitation (2, 4, 6, and 8 Hz-sine).
Highlights
Many drivers suffer from occupational diseases, including stomach disease, heart disease, and anxiety disorder
The nonlinear dynamic characteristics of the MR damper limit its application in engineering
The main contributions in this paper are given as follow: 1) a unified-format model for an MR damper combining the Bingham model and the Bouc-Wen model is proposed; 2) a viscous damping tracking model based on the Bingham model is applied into a skyhook control; 3) an improved on-off control is proposed for comparison; and 4) a low-cost 3sensor semi-active seat structure is put forward, in which the digital integrator and an extended Kalman filter are adopted for signal processing
Summary
Many drivers suffer from occupational diseases, including stomach disease, heart disease, and anxiety disorder. The main contributions in this paper are given as follow: 1) a unified-format model for an MR damper combining the Bingham model and the Bouc-Wen model is proposed; 2) a viscous damping tracking model based on the Bingham model is applied into a skyhook control; 3) an improved on-off control is proposed for comparison; and 4) a low-cost 3sensor semi-active seat structure is put forward, in which the digital integrator and an extended Kalman filter are adopted for signal processing. Compared with the traditional skyhook control and on-off control, the expected current of the skyhook control based on viscous damper tracking is smoother This is because the SH control proposed in this paper converts the active force into the desired damping coefficient of the MR damper, and limits the value range of the desired viscosity coefficient within a reasonable range.
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