交流正弦液压泵动态性能设计与分析

发布时间：2017-12-31 03:47

本文关键词：交流正弦液压泵动态性能设计与分析　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了满足航空航天和国防工业对大型锻件日益增长的需求，大型液压机的开发研制已成为国内锻压机械和重机行业势在必行的攻关项目和普遍关注的焦点。考虑到锻造操作机工作在高压、重载与交变冲击载荷的工况下，其传动系统与控制系统的设计极其关键，通常需要采用正弦泵控液压系统和机电液混合驱动的方式来实现快速和准确控制。正弦泵作为一种新型的液压动力元件，在系统中发挥着能量供给与流量控制的双重作用，其动态特性的研究对提高大型液压机性能和国产锻造设备的锻造能力有着重要意义。本研究课题受到了国家自然科学基金《交变流体驱动的冲击机构动力学与控制研究》（编号：11272122）项目资助。论文以Wepuko Hydraulic公司的RX系列正弦液压泵为原型，对该泵的缸体—柱塞组件等核心部件进行了运动学与动力学分析。在此基础上，结合功率键合图理论对输出流量峰值为500L/min的正弦液压泵进行了理论分析与仿真研究。论文首先详细分析了正弦液压泵的几何结构与工作原理，根据正弦液压泵的几何结构和内部组件的运动规律，建立了柱塞—滑靴组件、偏心摆变量机构和转子组件的运动学方程并推导了活塞行程、定子偏心量、配流轴开口量等参数随时间、控制量输入变化的函数关系式。在此基础上，建立了柱塞组件运动的数学模型，，通过仿真获取了柱塞位移、速度和加速度、定子偏心量、偏心摆夹角、柱塞—滑靴夹角随时间变化的曲线并针对柱塞运动过程中的惯性力、离心力、滑靴静压支承力进行了分析。然后结合功率键合图理论和流体机械的基本原理，对正弦泵内部的能量流动情况进行分析，建立内部各元件的功率键合图模型及其AMESim仿真模型。通过仿真分别研究了：偏心摆变量机构控制系统的动态响应特性；不同排油口压力下的柱塞腔流量和压力波动情况；不同柱塞数目下的正弦液压泵的流量脉动情况；不同控制信号作用下的正弦液压泵整体输出流量以及多泵联合时的流量输出特性。
[Abstract]:In order to meet the needs of the aerospace and defense industry to the growing demand for large forgings, the development of large hydraulic machine has become the focus of domestic forging machinery and heavy machinery industry imperative research projects and common concern. Considering the forging operation machine in high voltage, heavy load and alternating load condition, the design of the drive system and control the system is extremely critical, usually requires the use of sinusoidal pump controlled hydraulic system and electro-hydraulic hybrid driven way to achieve rapid and accurate control. Sine pump as a hydraulic power component model, energy supply and play a dual role in the traffic control system, the research of its dynamic characteristics is of great significance for improving the forging the ability of performance of large hydraulic machine and domestic forging equipment. The research subject is the impact mechanism driven by alternating fluid of National Natural Science Foundation " Study and Control Research (number: 11272122) project support.
Based on the RX series of sinusoidal hydraulic pump Wepuko Hydraulic company as the prototype, the core components of the pump cylinder and plunger assembly analyzed the kinematics and dynamics. On this basis, combined with the power bond graph theory by theoretical analysis and Simulation Study on peak output flow of sinusoidal pump 500L/min.
Firstly, a detailed analysis of the geometric structure and working principle of sinusoidal pump, according to the law of motion of the geometrical structure and the internal components of the sine of the hydraulic pump, a piston slipper assembly, eccentric pendulum mechanism and kinematics equation of variable rotor assembly and deduced the piston stroke, stator eccentricity, valve shaft opening parameters with time, the function relation between control input changes.
On this basis, establishes the mathematical model of motion of the piston, through the simulation to obtain the piston displacement, velocity and acceleration, stator eccentricity, eccentric pendulum angle of piston slipper angle curves and for the inertial force of the plunger movement in the process of centrifugal force, hydrostatic slipper bearing force are analyzed.
The basic principle and the combination of power bond graph theory and fluid mechanics, analysis of sinusoidal energy flow inside the pump, the establishment of the internal components of the power bond graph model and AMESim simulation model. The simulation control system were studied: the eccentric pendulum variable mechanism dynamic response; piston cavity flow and pressure fluctuation different oil outlet pressure; flow pulsation of sinusoidal pump under the different plunger number; flow output characteristic of overall output sine pump flow under the action of different control signals and pump combination.

【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH137.51

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