螺杆挤压-旋转式磁流变阻尼器力学特性研究
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TH122

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国家自然科学基金资助项目(11902356)


The Mechanical Performance of Rotary Magneto⁃rheological Damper Based on Screw Structure
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    摘要:

    传统的磁流变阻尼器所产生的阻尼力通常与驱动速度相关,呈现出黏性阻尼特征。为获得具有库伦阻尼特征的磁流变阻尼器,提出一种具有大尺寸的螺杆挤压的旋转式磁流变阻尼器(screw-rotary magneto-rheological damper,简称SR-MRD)并对其进行力学特性研究。首先,通过分析SR-MRD的结构原理,并基于平板模型来建立各个流体通道的速度分布;其次,基于Herschel-Bulkley模型建立SR-MRD流体力学模型,计算SR-MRD内部压力差以及扭转剪切力;然后,根据SR-MRD流体力学模型计算阻尼力矩,并分析各项关键参数对阻尼力矩的影响;最后,通过加工制作原理样机完成振动试验,验证力学模型的有效性以及阻尼器的实际输出阻尼力矩性能。研究结果表明:SR-MRD试验阻尼力矩与理论计算值基本符合;与传统的旋转式阻尼器相比,不仅能够产生较大的阻尼力矩,而且还具备明显的库伦阻尼特征。

    Abstract:

    The damping force generated by the conventional magnetorheological fluid damper is usually related to the driving speed, and thus exhibiting a viscous damping characteristic. In order to obtain a magneto-rheological fluid damper with Coulomb damping characteristics, the large-scale size of a screw-rotary magneto-rheological damper (SR-MRD) is proposed to analyze the mechanical property. Firstly, the structural principle of SR-MRD is analyzed, and the velocity distribution of each fluid channel is calculated based on the Parallel-Plate model. Secondly, a fluid mechanics model of the SR-MRD is established, based on the Herschel-Bulkley model, to calculate the internal pressure drop of SR-MRD and the shear force. Then, the damping torque is calculated according to the fluid mechanics model of SR-MRD, and the effect of key parameters on the damping torque is analyzed. Finally, the performance of an SR-MRD prototype tested by MTS. The research results show that the test damping torque of the SR-MRD prototype is consistent with the theoretical calculation value. In addition, it can not only generate a larger damping torque but also have obvious Coulomb damping characteristics compared with the traditional rotary damper.

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  • 在线发布日期: 2022-11-01
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