基于仿真离散数据的偏转板射流式伺服阀液动力计算方法研究

发布时间：2018-06-16 19:16

本文选题：偏转射流式伺服阀 + 动态模型　；参考：《机械工程学报》2016年12期

【摘要】：基于偏转射流式伺服阀工作机理,提出关于其动态特性分析及前置级液动力计算检测的问题。建立关于力矩马达、射流盘前置级以及功率滑阀三部分的完整伺服阀动态模型,确定前置级液动力的近似公式,并对整阀特性进行频率分析,验证了数学模型的正确性;建立伺服阀前置级内部的二维流场模型,并基于流场仿真所获得的离散数据,给出两种可用于计算稳态液动力的方法,即动量定理法和压差法,通过计算某型伺服阀的液动力,验证上述两种方法能够相互印证;设计并实现了一种双自由度的液动力测试平台,实现了对液动力的间接测试。结果表明,采用动量定理法和压差法计算得到的液动力值,与其近似计算公式以及试验结果一致,证明了提出的液动力计算方法与测试系统均具有可行性,为此类伺服阀的改进与优化提供了技术支撑。
[Abstract]:Based on the working mechanism of the deflection jet servo valve, the dynamic characteristic analysis and the dynamic calculation and detection of the front stage hydraulic valve are put forward. The complete servo valve dynamic model about torque motor, jet disc front stage and power slide valve is established, the approximate formula of the front stage fluid power is determined, and the frequency analysis of the whole valve characteristic is carried out to verify the correctness of the mathematical model. The two-dimensional flow field model of the front stage of the servo valve is established. Based on the discrete data obtained from the simulation of the flow field, two methods for calculating the steady-state hydrodynamic force, namely, the momentum theorem method and the pressure difference method, are presented to calculate the hydraulic force of a certain type of servo valve. It is verified that the two methods can be verified and a two-degree-of-freedom hydrodynamic testing platform is designed and implemented. The indirect test of hydraulic power is realized. The results show that the hydrodynamic values calculated by the momentum theorem method and the pressure difference method are consistent with the approximate calculation formula and the experimental results. It is proved that the proposed hydrodynamic calculation method and the test system are feasible. It provides technical support for the improvement and optimization of this kind of servo valve.
【作者单位】：北京交通大学机械与电子控制工程学院;
【基金】：国家国际科技合作专项资助项目(2012DFG71490)
【分类号】：TH137.52

【参考文献】