新型磁流变阻尼器的研制及其准静态分析

Development and Quasi-steady Analysis of Novel Magnetorheological Damper

传统磁流变阻尼器由于其结构限制,节流通道横截面积与活塞大小及阻尼器其他结构尺寸互相关联,导致其阻尼力及可调阻尼比不能同时兼顾,致使冲击环境中应用的传统磁流变阻尼器结构复杂、尺寸过大。对此,提出一种节流通道旁置的新型双出杆磁流变阻尼器,基于流体力学理论,根据磁流变液的流变特性,详细讨论了磁流变液在节流通道内的流速分布,并基于Herschel-Bulkley模型建立其流速表达式及其力学模型。在流体行为指数等于1时,通过力学模型得到阻尼力计算结果。计算结果与实测结果基本吻合,验证了准静态模型的准确性,为新型阻尼器的设计提供了公式和理论指导。

Considering the structural limitations of the conventional magnetorheological dampers,the cross-sectional area of the throttling channel is correlated to the piston size and other structural dimensions of the damper.Therefore,the damping force and the adjustable damping ratio cannot be considered simultaneously,resulting in the application in the impact environment.Meanwhile,conventional magnetorheological dampers have complicated structures and excessive sizes.In order to resolve these shortcomings,a novel double-rod bypass magnetorheological damper was proposed.Based on the theory of fluid mechanics and the rheological features of the magnetorheological fluid,the velocity distribution of the magnetorheological fluid in the throttling channel was discussed in detail.In this regard,the Herschel-Bulkley model was applied to establish the velocity expression and mechanical model.Then the damping force was calculated for the fluid behavior,while the index number is set to 1.It is found that obtained results are in excellent consistency with the measured results,which verify the accuracy of the quasi-static model.It is expected that the proposed model can provide a theoretical guidance for designing novel magnetorheological dampers.