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<p>In this study, a magnetorheological (MR) control valve featuring an extended circular damping channel is proposed for regulating the flow in high-speed magnetorheological hydraulic systems. The Herschel–Bulkley model is employed in conjunction with COMSOL Multiphysics to analyze both the magnetic field and the flow field within the MR valve. The influence of coil current and inlet pressure on the valve’s flow control characteristics is investigated. The flow control performance and dynamic behavior of MR valves with varying damping channel heights are experimentally tested. The MR fluid within the damping channel experiences a high shear rate, and while an increase in coil current leads to a reduction in flow rate, it is insufficient to fully close the valve. The flow control range of MR valves is influenced by the coil current, with smaller damping channel heights h resulting in a broader flow control range. For instance, when the damping channel height <i>h</i> is 1.5 mm and the inlet pressure <i>P</i><sub>1</sub> is 800 kPa (with the outlet pressure <i>P</i><sub>2</sub> near zero), the maximum flow rate <i>q</i><sub><i>max</i></sub> of the MR valve reaches 30.7 L/min, and the controllable flow rate ratio <i>λ</i> is 43 %. Under the same inlet pressure <i>P</i><sub>1</sub> = 800 kPa, reducing the damping channel height to <i>h</i> = 1 mm enhances the flow control range of the MR valve by 10.16 L/min and increases the controllable flow ratio <i>λ</i> by 37 %. Moreover, the response time of the MR valves is minimally impacted by the controlled flow volume. For example, with a damping channel height of <i>h</i> = 1 mm, the response time for a change in MR valve flow is about 40 ms.</p>

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Flow control characterization of a magnetorheological control valve at a high shear rate

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Yongqi Jiang,
  • Wei Zhao,
  • Qing Ouyang,
  • Hongsheng Hu

摘要

In this study, a magnetorheological (MR) control valve featuring an extended circular damping channel is proposed for regulating the flow in high-speed magnetorheological hydraulic systems. The Herschel–Bulkley model is employed in conjunction with COMSOL Multiphysics to analyze both the magnetic field and the flow field within the MR valve. The influence of coil current and inlet pressure on the valve’s flow control characteristics is investigated. The flow control performance and dynamic behavior of MR valves with varying damping channel heights are experimentally tested. The MR fluid within the damping channel experiences a high shear rate, and while an increase in coil current leads to a reduction in flow rate, it is insufficient to fully close the valve. The flow control range of MR valves is influenced by the coil current, with smaller damping channel heights h resulting in a broader flow control range. For instance, when the damping channel height h is 1.5 mm and the inlet pressure P1 is 800 kPa (with the outlet pressure P2 near zero), the maximum flow rate qmax of the MR valve reaches 30.7 L/min, and the controllable flow rate ratio λ is 43 %. Under the same inlet pressure P1 = 800 kPa, reducing the damping channel height to h = 1 mm enhances the flow control range of the MR valve by 10.16 L/min and increases the controllable flow ratio λ by 37 %. Moreover, the response time of the MR valves is minimally impacted by the controlled flow volume. For example, with a damping channel height of h = 1 mm, the response time for a change in MR valve flow is about 40 ms.