液压滑阀稳态液动力特性及补偿优化研究

发布时间：2018-06-03 20:17

本文选题：滑阀 + 稳态液动力　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：液压控制阀的性能优化是提高液压技术水平的重要环节。稳态液动力是液压阀设计优化分析的重要参考依据,完整的设计过程包括稳态液动力的计算、特性揭示以及补偿优化,每个过程对应得到的结论都将对液压控制阀的优化设计提供理论依据。本文以液压阀中的滑阀形式为研究对象,分别从压力分析和动量定理角度对其建立稳态液动力的数学计算模型,并将计算模型与数值计算得到的流场数据相结合。不同计算方法得到的稳态液动力不仅是液动力特性揭示的前提,也是互相验证计算正确性的依据之一。对流动过程进行简化假设,建立理想的二维计算模型,计算比较入口节流出口无节流和入口无节流出口节流两种流动形式的液动力特性,结合流场从动量及熵产的角度揭示液动力特性机理。针对与理论液动力特性不符的流动形式研究结构参数对其液动力特性的影响,并对影响机理进行阐述总结。在二维理想化模型计算的基础上建立三维计算模型,进行网格无关性验证,并将液动力计算结果与二维模型进行对比,验证仿真计算的正确性。应用动量定理及流动熵产理论研究滑阀的液动力补偿,确定可优化的结构参数,搭建液动力补偿参数自动优化平台,集成建立计算模型、网格划分及流场计算三个过程,通过自动修改可优化的结构参数完成液动力补偿的自动优化。研究优化过程中优化算法及算法参数对优化效果的影响,找出最佳优化算法和算法参数。搭建液动力实验台对液动力进行测量,针对仿真计算模型设计实验阀,模拟仿真计算的物理边界条件,验证不同阀开口下的液动力特性、结构参数对液动力特性的影响以及补偿优化阀结构的优越性。全文通过压力分析和动量定理结合流场数值计算数据计算稳态液动力;应用动量定理和流动熵产理论对液动力特性进行阐述并总结结构参数对液动力特性的影响;搭建液动力补偿参数自动优化平台,探寻最佳优化算法和算法参数完成液动力补偿的自动优化;设计液动力测量实验台,验证经数值计算分析得到的液动力特性相关结论的正确性。
[Abstract]:The performance optimization of hydraulic control valve is an important link to improve the level of hydraulic technology. The steady-state hydraulic power is an important reference for the optimization analysis of the hydraulic valve design. The complete design process includes the calculation of the steady-state hydraulic power, the disclosure of the characteristics and the optimization of the compensation. The conclusions obtained from each process will provide theoretical basis for the optimal design of hydraulic control valves. In this paper, the sliding valve in hydraulic valve is taken as the research object, and the mathematical calculation model of steady fluid dynamics is established from the angle of pressure analysis and momentum theorem respectively, and the calculation model is combined with the flow field data obtained by numerical calculation. The steady-state hydrodynamic force obtained by different calculation methods is not only the premise to reveal the hydrodynamic characteristics, but also one of the bases for mutual verification of the correctness of the calculation. The flow process is simplified and an ideal two-dimensional computational model is established to calculate and compare the hydrodynamic characteristics of the two kinds of flow modes: the inlet and the outlet without throttling and the inlet without throttling. Combined with the flow field, the mechanism of hydrodynamic characteristics is revealed from the angle of momentum and entropy production. The influence of structural parameters on the hydrodynamic characteristics of the flow forms which are not consistent with the theoretical hydrodynamic characteristics is studied, and the influence mechanism is summarized. On the basis of the two-dimensional idealized model, a three-dimensional computational model is established to verify the grid independence. The results of hydrodynamic calculation are compared with the two-dimensional model to verify the correctness of the simulation calculation. Based on momentum theorem and flow entropy production theory, the hydrodynamic compensation of slide valve is studied. The structure parameters can be optimized, the automatic optimization platform of hydraulic power compensation parameters is set up, the calculation model is integrated, the grid is divided and the flow field is calculated. The automatic optimization of hydrodynamic compensation is accomplished by automatically modifying the structure parameters that can be optimized. The effect of optimization algorithm and algorithm parameters on the optimization effect is studied, and the optimal optimization algorithm and algorithm parameters are found out. The hydraulic power was measured by the hydraulic power test bench. The experimental valve was designed according to the simulation calculation model. The physical boundary conditions of the simulation calculation were simulated to verify the hydrodynamic characteristics under the different opening of the valve. The influence of structural parameters on hydrodynamic characteristics and the superiority of compensation optimization valve structure. In this paper, the steady-state hydrodynamic force is calculated by pressure analysis and momentum theorem combined with the numerical calculation data of the flow field, the hydrodynamic characteristics are expounded by the momentum theorem and the flow entropy production theory, and the influence of structural parameters on the hydrodynamic characteristics is summarized. Build the automatic optimization platform of hydraulic power compensation parameters, explore the optimal optimization algorithm and algorithm parameters to complete the automatic optimization of hydrodynamic compensation. The validity of the conclusions obtained by numerical calculation and analysis is verified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.52

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