双模式变间隙磁流变阻尼器研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (3) : 129-138.

论文

双模式变间隙磁流变阻尼器研究

董小闵，邓雄，王陶，李鑫，晏茂森

作者信息 +

Dual-mode variable clearance MR damper

DONG Xiaomin, DENG Xiong, WANG Tao, LI Xin, YAN Maosen

Author information +

文章历史 +

摘要

直升机飞行过程中座椅系统主要处于隔振工况，阻尼器隔振行程小且持续输出较小的阻尼力，而直升机遇突发状况坠机时属于抗坠毁工况，阻尼器需在缓冲行程内保持力值平衡，且提供大阻尼大行程。针对隔振和抗坠毁双模式工况对阻尼器设计要求存在矛盾的问题，提出了一种能同时满足直升机座椅隔振和抗坠毁的双模式变间隙磁流变阻尼器（magnetorheological damper，MRD）结构。为验证结构的有效性，建立了变间隙磁流变阻尼器的力学模型，并在不同乘员重量、不同冲击速度下对变间隙磁流变阻尼器进行拓扑形面优化；基于拓扑形面优化结果，完成了变间隙磁流变阻尼器样机的加工、装配和测试。数值仿真和双模式特性试验表明，变间隙磁流变阻尼器的抗坠毁单元能在所选冲击工况下均能输出平稳、稳定可控的库伦阻尼力，同时其隔振单元具有良好的动态范围，最大阻尼力和动态范围均满足设计要求。

Abstract

The helicopter seat is mainly in the vibration isolation condition, the stroke of damper is small, and the small damping force is continuously output. When helicopter crashes in an emergency, the damper needs to maintain a balance of force within the buffer stroke and provide large damping and large stroke. Considering the contradiction of damper design requirements under dual-mode working conditions of vibration isolation and anti-crash, a dual-mode magnetorheological damper (MRD) with variable damping gap is proposed, which can meet the requirements of helicopter seat vibration isolation and anti-crash at the same time. To verify the effectiveness of the proposed structure, the mechanical model of damper is established, and the topology is optimized. Based on the optimization results, the prototype of MRD is manufactured and tested. The results show that Coulomb force of MRD under selected shock conditions is stable and controllable, and its vibration isolation unit has a good dynamic range. Both the maximum damping force and the dynamic range meet the design requirements.

导出引用

董小闵，邓雄，王陶，李鑫，晏茂森. 双模式变间隙磁流变阻尼器研究[J]. 振动与冲击, 2023, 42(3): 129-138

DONG Xiaomin, DENG Xiong, WANG Tao, LI Xin, YAN Maosen. Dual-mode variable clearance MR damper[J]. Journal of Vibration and Shock, 2023, 42(3): 129-138

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