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A linear damper for automotive application based on rotary magnetorheological brake
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DOI：10.1088/1361-665X/ae5ee2.png)
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Abstract
En 中文
In this study, a novel magnetorheological damper (MRD) for passenger cars is proposed, optimally designed and experimentally investigated. The proposed damper implements a screw mechanism for converting linear motion to rotation and uses a rotary MR brake for damping, which is referred as S-MRD in this study. While MR dampers offer superior semi-active control for vehicle suspensions, existing designs in both flow and shear modes often face trade-offs between performance, compactness, and high off-state torque. The proposed S-MRD overcomes these limitations by efficiently transforming the suspension’s linear motion into rotational motion, enabling an effective shear-mode rotary MR braking configuration within a compact structure. For the optimal design of the S-MRD, the Bingham plastic model was adopted to estimate the damping force of the MR fluid, and key structural parameters were optimized using the non-dominated sorting genetic algorithm II (NSGA-II). The optimization process yielded a target damping force of 2000 N for prototyping. Based on the optimal parameters, a prototype was fabricated and experimentally validated. The experimental results demonstrated a maximum damping force of 1890 N at 0.4 Hz and 2.5 A, achieving 94.5% of the optimized target value. These findings confirm the validity of the simulation model and demonstrate that the proposed S-MRD provides a high-performance, compact, and promising solution for advanced automotive suspension systems.
Keywords:
magnetorheological damper
rotary MR brake
automotive suspension
optimal design
NSGA-II
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