零件变形对柱塞泵特性的影响研究

发布时间：2018-02-27 03:03

本文关键词： 斜盘式轴向柱塞泵泵轴柱塞副有限元分析 ANSYS-Workbench　出处：《西南交通大学》2011年硕士论文　论文类型：学位论文

【摘要】：本文以斜盘式轴向柱塞泵的关键零件部件—泵轴及柱塞副的变形及其对柱塞泵特性的影响为主要研究目标。通过对泵轴载荷系统的分析,确定径向载荷对泵轴及柱塞泵性能有较大影响；采用MATLAB的SIMULINK工具箱建立泵轴径向载荷仿真模型,对比分析柱塞泵主要性能参数对泵轴径向载荷的影响发现：额定压力、斜盘倾角及柱塞直径对泵轴径向载荷的大小有重要影响；以SIMULINK仿真结果为载荷条件,利用有限元分析软件ANSYS-Work-bench对泵轴进行分析。通过静结构分析得到泵轴应力应变结果,并与理论分析进行了对比,两者结果基本相同,经校核,泵轴强度满足使用要求,但是刚度却超出了许用范围,需要通过改善材料或者改进结构来提高泵轴的刚度；基于静结构分析完成泵轴疲劳分析,得到泵轴循环寿命曲线、损坏、安全系数及双轴应力分布规律；通过模态分析算得其固有频率和临界转速,为防止泵轴发生共振提供设计依据；完成泵轴谐响应分析,得到交变载荷作用下泵轴的响应规律。本文同时利用ANSYS-Workbench对斜盘式轴向柱塞泵柱塞副变形进行了研究,分析计算了柱塞副在实际工作中的变形情况,完成柱塞副热变形、压力变形及热压耦合变形计算,得到变形后柱塞副间隙大小及形状；推导出柱塞副泄漏量计算公式,利用所推导泄漏量计算公式及变形分析结果,分析计算了变形对柱塞副的泄漏及柱塞泵容积效率的影响,并与未考虑变形的情况进行了对比分析,变形后柱塞泵泄露较变形前有明显的增加,导致柱塞泵的容积效率也有所下降。通过轴向柱塞泵的泵轴在工作状况下的应力应变及振动研究,为柱塞泵的泵轴设计、优化及使用提供了有益的参考；对柱塞副变形及变形后的泄漏、容积效率的分析可为今后斜盘式轴向柱塞泵柱塞副的设计使用及柱塞泵性能维护提供依据。
[Abstract]:The main research object of this paper is the deformation of pump shaft and plunger pair and its influence on the characteristic of piston pump, which is the key part of inclined disc axial piston pump. By analyzing the load system of pump shaft, it is determined that radial load has great influence on the performance of pump shaft and piston pump, and the radial load simulation model of pump shaft is established by SIMULINK toolbox of MATLAB. By comparing and analyzing the influence of main performance parameters of piston pump on radial load of pump shaft, it is found that rated pressure, inclination angle of inclined disk and diameter of plunger have important influence on radial load of pump shaft. The pump shaft is analyzed by finite element analysis software ANSYS-Work-bench. Through static structure analysis, the results of stress and strain of pump shaft are obtained and compared with the theoretical analysis. The results are basically the same. After checking, the strength of pump shaft meets the requirements of application. However, the stiffness is beyond the allowable range, and the stiffness of the pump shaft should be improved by improving the material or the structure. Based on the static structure analysis, the fatigue analysis of the pump shaft is completed, and the cycle life curve of the pump shaft is obtained, which is damaged. Safety factor and biaxial stress distribution law; through modal analysis to calculate its natural frequency and critical speed to provide a design basis for preventing pump shaft resonance; complete pump shaft harmonic response analysis to obtain the response law of pump shaft under alternating load. At the same time, the deformation of plunger pair of inclined disc axial piston pump is studied by using ANSYS-Workbench. The deformation of plunger pair in practical work is analyzed and calculated, and the calculation of hot deformation, pressure deformation and coupled deformation of plunger pair is completed. The size and shape of the clearance of the plunger pair after deformation are obtained, the formula for calculating the leakage rate of the plunger pair is derived, and the effect of the deformation on the leakage of the plunger pair and the volume efficiency of the piston pump is analyzed and calculated by using the calculated formula of the leakage rate and the result of the deformation analysis. The results show that the leakage of the piston pump is obviously increased than that before deformation, which leads to the decrease of the volume efficiency of the piston pump. Through the research on stress strain and vibration of axial piston pump shaft under working condition, it provides a useful reference for the design, optimization and application of piston pump shaft. The analysis of volumetric efficiency can provide the basis for the design and use of plunger pairs of inclined disc axial piston pump and the performance maintenance of piston pump.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH322

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