双元动力发动机活塞连杆组设计

发布时间：2019-05-22 16:13

【摘要】：双元动力发动机能同时输出机械和液压两种动力,在工程机械领域有广泛的应用前景。活塞连杆组作为双元动力发动机的核心零部件,对其结构进行合理的设计和优化至关重要。本文论述了活塞式内燃机-柱塞泵系统的工作原理,论述了液压自由活塞发动机的分类和工作原理以及国内外研究现状,论述了曲柄连杆机构研究现状。对双元动力发动机整机方案进行介绍,阐述了双元动力发动机的结构组成和工作原理。对双元动力发动机活塞连杆组主要零部件进行了设计计算,利用Solidworks对双元动力发动机活塞连杆组建模,进行了运动干涉校核。利用ANSYS Workbench对双元动力发动机的连杆进行了最大压缩工况和最大拉伸工况下的有限元强度分析,分别得到两种工况下的连杆应力云图和变形云图。计算了连杆的疲劳安全系数。通过对有限元结果的分析,得知连杆的强度足够,可以进一步进行优化,以达到减轻质量、节约材料和降低惯性力的目的。本研究利用ANSYS Workbench中的Design Explorer对连杆进行结构优化设计。选取了连杆小头外径和连杆杆身厚度的一半作为输入参数,选取连杆杆身质量、连杆最大变形和连杆最大应力为输出参数对连杆进行优化设计。设计目标是使连杆在满足强度和刚度的约束要求下,尽可能减小连杆杆身质量。通过比较优化前后的最大应力、最大变形和疲劳安全系数,可知优化后的连杆满足了强度和刚度的设计要求,且连杆杆身质量降低了4.5%,达到了优化设计的目的。
[Abstract]:Dual power engine can output both mechanical and hydraulic power at the same time, so it has a wide range of application prospects in the field of construction machinery. As the core component of dual power engine, it is very important to design and optimize the structure of piston connecting rod group. In this paper, the working principle of piston internal combustion engine-plunger pump system is discussed, the classification and working principle of hydraulic free piston engine and the research status at home and abroad are discussed, and the research status of crank and connecting rod mechanism is discussed. The whole scheme of dual power engine is introduced, and the structure composition and working principle of dual power engine are expounded. The main parts of the piston connecting rod group of the dual power engine are designed and calculated. The die of the piston connecting rod of the dual power engine is established by using Solidworks, and the motion interference check is carried out. The finite element strength analysis of the connecting rod of the dual power engine under the maximum compression condition and the maximum tensile condition is carried out by using ANSYS Workbench, and the stress cloud diagram and the deformation cloud diagram of the connecting rod under the two working conditions are obtained respectively. The fatigue safety factor of the connecting rod is calculated. Through the analysis of the finite element results, it is found that the strength of the connecting rod is sufficient and can be further optimized in order to reduce the quality, save the material and reduce the inertia force. In this study, the structural optimization design of connecting rod is carried out by using Design Explorer in ANSYS Workbench. The outer diameter of the connecting rod head and half of the thickness of the connecting rod body are selected as the input parameters, and the mass of the connecting rod body, the maximum deformation of the connecting rod and the maximum stress of the connecting rod are selected as the output parameters to optimize the design of the connecting rod. The design goal is to reduce the mass of the connecting rod as much as possible under the constraint of strength and stiffness. By comparing the maximum stress, maximum deformation and fatigue safety factor before and after optimization, it can be seen that the optimized connecting rod meets the design requirements of strength and stiffness, and the mass of the connecting rod is reduced by 4.5%, which achieves the purpose of optimal design.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK402

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