【摘要】：雙元動力發(fā)動機能同時輸出機械和液壓兩種動力,在工程機械領(lǐng)域有廣泛的應(yīng)用前景。活塞連桿組作為雙元動力發(fā)動機的核心零部件,對其結(jié)構(gòu)進行合理的設(shè)計和優(yōu)化至關(guān)重要。本文論述了活塞式內(nèi)燃機-柱塞泵系統(tǒng)的工作原理,論述了液壓自由活塞發(fā)動機的分類和工作原理以及國內(nèi)外研究現(xiàn)狀,論述了曲柄連桿機構(gòu)研究現(xiàn)狀。對雙元動力發(fā)動機整機方案進行介紹,闡述了雙元動力發(fā)動機的結(jié)構(gòu)組成和工作原理。對雙元動力發(fā)動機活塞連桿組主要零部件進行了設(shè)計計算,利用Solidworks對雙元動力發(fā)動機活塞連桿組建模,進行了運動干涉校核。利用ANSYS Workbench對雙元動力發(fā)動機的連桿進行了最大壓縮工況和最大拉伸工況下的有限元強度分析,分別得到兩種工況下的連桿應(yīng)力云圖和變形云圖。計算了連桿的疲勞安全系數(shù)。通過對有限元結(jié)果的分析,得知連桿的強度足夠,可以進一步進行優(yōu)化,以達到減輕質(zhì)量、節(jié)約材料和降低慣性力的目的。本研究利用ANSYS Workbench中的Design Explorer對連桿進行結(jié)構(gòu)優(yōu)化設(shè)計。選取了連桿小頭外徑和連桿桿身厚度的一半作為輸入?yún)?shù),選取連桿桿身質(zhì)量、連桿最大變形和連桿最大應(yīng)力為輸出參數(shù)對連桿進行優(yōu)化設(shè)計。設(shè)計目標(biāo)是使連桿在滿足強度和剛度的約束要求下,盡可能減小連桿桿身質(zhì)量。通過比較優(yōu)化前后的最大應(yīng)力、最大變形和疲勞安全系數(shù),可知優(yōu)化后的連桿滿足了強度和剛度的設(shè)計要求,且連桿桿身質(zhì)量降低了4.5%,達到了優(yōu)化設(shè)計的目的。
[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.
【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK402

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