Modeling and Analysis of A Rotary Direct Drive Servovalve
Modeling and Analysis of A Rotary Direct Drive Servovalve
复制标题
旋转直驱伺服阀的建模与分析
DOI：
10.3901/cjme.2014.0725.127
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发表时间：
2014-09-01
影响因子：
4.2
通讯作者：
Yu Dehong
中科院分区：
文献类型：
--
作者：
Yu Jue;Zhuang Jian;Yu Dehong
直接驱动伺服阀主要限于低流量和低带宽的应用，由于相当大的流动力。目前的研究主要集中在提高驱动力，这反过来又限制了磁性材料的发展。为了减小液动力，提出了一种新型旋转直驱式伺服阀。该阀采用旋转结构，阀芯轴对称，在阀腔内作一定角度范围内的旋转运动。伺服阀的节流孔是由阀芯上的方波形凸台与阀套上的矩形孔口配合而成。为了研究RDDV伺服阀的性能，建立了流量模型和力学模型，得到了不同阀芯转角和阀芯半径下的流量和流量诱导转矩。模型分析表明，由于所提出的阀门结构，可以减轻驱动扭矩。采用ANSYS/FLUENT计算流体动力学（CFD）分析对理论分析进行了验证。此外，还对该阀的流量特性和机械特性进行了实验研究。仿真和实验结果均与理论模型分析结果一致，证明了这种新颖的直驱伺服阀结构可以减小阀芯上的液动力，改善阀的频率响应特性。本研究提出一种新颖的旋转式直驱伺服阀，可有效地降低液动力。
Direct drive servovalves are mostly restricted to low flow rate and low bandwidth applications due to the considerable flow forces. Current studies mainly focus on enhancing the driving force, which in turn is limited to the development of the magnetic material. Aiming at reducing the flow forces, a novel rotary direct drive servovalve(RDDV) is introduced in this paper. This RDDV servovalve is designed in a rotating structure and its axially symmetric spool rotates within a certain angle range in the valve chamber. The servovalve orifices are formed by the matching between the square wave shaped land on the spool and the rectangular ports on the sleeve. In order to study the RDDV servovalve performance, flow rate model and mechanical model are established, wherein flow rates and flow induced torques at different spool rotation angles or spool radiuses are obtained. The model analysis shows that the driving torque can be alleviated due to the proposed valve structure. Computational fluid dynamics(CFD) analysis using ANSYS/FLUENT is applied to evaluate and validate the theoretical analysis. In addition, experiments on the flow rate and the mechanical characteristic of the RDDV servovalve are carried out. Both simulation and experimental results conform to the results of the theoretical model analysis, which proves that this novel and innovative structure for direct drive servovalves can reduce the flow force on the spool and improve valve frequency response characteristics. This research proposes a novel rotary direct drive servovalve, which can reduce the flow forces effectively.