基于多物理场耦合分析的高压柱塞泵结构强度研究

发布时间：2018-01-16 18:04

本文关键词：基于多物理场耦合分析的高压柱塞泵结构强度研究　出处：《重庆理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着柴油发动机的飞速发展,燃油喷射的压力也越来越大,而高压柱塞泵是燃油喷射系统的核心,其结构紧凑、工作压力高,在高压下仍需保持较高的效率。本文利用有限元软件和松耦合的方法对高压柱塞泵进行多物理场耦合分析的结构强度研究,提出了比较系统性对其进行研究的方法。主要做了如下工作:⑴高压油泵在泵油阶段的流体动力学分析首先利用Hypermesh有限元软件建立燃油的流体动力学模型,将模型导入Fluent软件进行流体分析,根据所给的条件及参数,计算其泵油过程油压变化。⑵油泵柱塞偶件流固耦合结构强度分析运用Hypermesh建立柱塞与柱塞套的结构有限元模型,其次利用前述流体动力学计算结果,导出柱塞与柱塞套的最大油压时刻流体压力分布数据,将其导入Abaqus软件里,将油压载荷映射到固体有限元模型中,计算柱塞偶件应力与变形。⑶凸轮-滚轮-滚轮销运动组合的结构力学分析首先运用Adams多体动力学软件,导入前述柱塞油压时间曲线进行加载,进行多体动力学仿真。然后根据计算结果提取滚轮销对滚轮的作用力,利用Abaqus软件对凸轮-滚轮进行静力分析。其次利用经典的Hertz接触理论计算法和有限元法计算出的最大接触应力进行比较。再通过建立Archard磨损方程对凸轮在一个周期内的磨损做简单的估算,为凸轮的耐磨损设计提供理论依据。最后根据计算结果提取凸轮对滚轮的作用力,利用Abaqus软件对滚轮-滚轮销进行静力分析。⑷电磁阀电磁力分析利用Ansoft Maxwell软件建立电磁阀模型并计算一个周期的电磁力变化。⑸旁通阀电磁、液固耦合动态分析运用Hypermesh建立包含旁通阀、旁通阀套、弹簧盘、衔铁和螺钉的电磁、液固耦合有限元模型。然后利用前述流体动力学计算结果,导出旁通阀的流体压力分布数据到有限元模型,再利用电磁阀计算的电磁力作为载荷条件,对旁通阀关闭以及泵油过程进行动态力学分析。本文不仅考虑到泵油阶段流体对固体的影响,还利用多体动力学仿真对凸轮滚轮进行分析,并与接触应力的经典算法进行比较,以及利用电磁分析对旁通阀的打开、泵油和关闭过程进行动态分析,系统性地对整个喷油泵关键部件进行了完整的分析,也为其他类似油泵的分析提出了一个思路。
[Abstract]:With the rapid development of diesel engine, the pressure of fuel injection is increasing, and the high pressure piston pump is the core of fuel injection system, its structure is compact, the working pressure is high. It is necessary to maintain high efficiency at high pressure. In this paper, the structural strength of high pressure piston pump is studied by means of finite element software and loose coupling method. The methods of systematic research are put forward. The main work is as follows:. Firstly, the fluid dynamics model of high pressure oil pump is established by Hypermesh finite element software. The model is imported into Fluent software for fluid analysis, according to the given conditions and parameters. To calculate the oil pressure change during the oil pump. 2. The analysis of the fluid-solid coupling structure strength of the plunger coupling part of the oil pump. The structural finite element model of the plunger and plunger sleeve is established by using Hypermesh. Secondly, the fluid pressure distribution data of the maximum oil pressure time of plunger and plunger sleeve are derived by using the results of the fluid dynamics calculation mentioned above, and imported into Abaqus software. The oil pressure load is mapped to the solid finite element model to calculate the stress and deformation of the plunger coupling. 3. The structural mechanics analysis of the kinematic combination of cam roller and roller pin is carried out by using Adams multi-body dynamics software. Then the force of roller pin on roller wheel is extracted according to the result of calculation by introducing the oil pressure time curve of the plunger to load and carry on the multi-body dynamics simulation. The static analysis of cam-roller is carried out by using Abaqus software. Secondly, the maximum contact stress calculated by classical Hertz contact theory method is compared with that calculated by finite element method. Then Arc is established. Hard wear equation is used to estimate the wear of cam in a period. It provides a theoretical basis for the wear resistant design of the cam. Finally, the force of the cam on the roller is extracted according to the calculation results. Static Analysis of Roller and Roller Pin by using Abaqus Software. .4 electromagnetic Force Analysis of Solenoid Valve using Ansoft. Maxwell software establishes the solenoid valve model and calculates the electromagnetic force variation of a period of 5. 5 bypass valve electromagnetic. Dynamic analysis of liquid-solid coupling using Hypermesh to establish electromagnetic properties including bypass valve, bypass valve sleeve, spring disc, armature and screw. The fluid pressure distribution data of the bypass valve are derived to the finite element model, and the solenoid force calculated by the solenoid valve is used as the load condition. Dynamic mechanical analysis of bypass valve closure and pump oil process is carried out. This paper not only takes into account the effect of pump fluid on solid, but also makes use of multi-body dynamics simulation to analyze the cam roller. Compared with the classical algorithm of contact stress and the dynamic analysis of the opening, pump oil and closing process of the bypass valve by electromagnetic analysis, the key parts of the whole fuel injection pump are systematically analyzed. Also for other similar oil pump analysis proposed a train of thought.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH322

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