本文選題：動(dòng)臂　切入點(diǎn)：靜強(qiáng)度　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：動(dòng)臂是液壓挖掘機(jī)工作裝置中重要的構(gòu)件,實(shí)際施工中,動(dòng)臂既要承受鏟斗或者斗桿挖掘時(shí)頻繁的交變載荷,又要反復(fù)進(jìn)行物料的提升與卸載,且常常受到?jīng)_擊載荷,受力比較惡劣,容易發(fā)生失效事故。本文以山河智能SWE470中型液壓挖掘機(jī)動(dòng)臂為研究對(duì)象,從靜強(qiáng)度及疲勞強(qiáng)度兩方面展開(kāi)研究,并對(duì)動(dòng)臂進(jìn)行機(jī)構(gòu)優(yōu)化和結(jié)構(gòu)優(yōu)化,主要內(nèi)容如下： 建立工作裝置面向結(jié)構(gòu)有限元分析的靜力學(xué)模型,并建立挖掘機(jī)整機(jī)理論挖掘力和各個(gè)關(guān)鍵鉸點(diǎn)受力的數(shù)學(xué)模型,為結(jié)構(gòu)強(qiáng)度分析和結(jié)構(gòu)優(yōu)化提供依據(jù)。 建立動(dòng)臂有限元模型,對(duì)位移邊界條件進(jìn)行理論分析和仿真分析,并對(duì)典型工況和復(fù)合挖掘工況的有限元結(jié)果進(jìn)行對(duì)比分析,確定動(dòng)臂相對(duì)薄弱的部位,并找到最危險(xiǎn)截面,為動(dòng)臂的改進(jìn)提供參考依據(jù)。 在ADAMS中建立動(dòng)臂參數(shù)化模型,進(jìn)行鉸點(diǎn)優(yōu)化；在合理的鉸點(diǎn)布局基礎(chǔ)上,利用APDL建立動(dòng)臂殼固單元混合的參數(shù)化有限元模型,并進(jìn)行靈敏度分析和結(jié)構(gòu)優(yōu)化。通過(guò)優(yōu)化降低應(yīng)力集中,改善應(yīng)力分布。 以SWE470為試驗(yàn)平臺(tái),進(jìn)行應(yīng)力測(cè)試。對(duì)動(dòng)臂進(jìn)行多工況下的靜應(yīng)力測(cè)試,驗(yàn)證有限元模型的正確性。對(duì)動(dòng)臂進(jìn)行典型挖掘工況下的動(dòng)應(yīng)力測(cè)試,為后續(xù)的疲勞分析提供真實(shí)的載荷譜。 對(duì)應(yīng)力試驗(yàn)測(cè)得的動(dòng)臂危險(xiǎn)點(diǎn)的應(yīng)力-時(shí)間載荷歷程進(jìn)行濾波、雨流計(jì)數(shù)統(tǒng)計(jì)以及編譜處理,得到載荷歷程中的各級(jí)循環(huán)應(yīng)力。結(jié)合動(dòng)臂材料的S-N疲勞曲線以及靜強(qiáng)度分析的有限元結(jié)果,應(yīng)用線性名義應(yīng)力法理論,通過(guò)疲勞分析軟件MSC.Fatigue對(duì)動(dòng)臂進(jìn)行壽命預(yù)測(cè),確定疲勞強(qiáng)度薄弱區(qū)。
[Abstract]:The arm is an important component of the working device of hydraulic excavator, the actual construction boom, should bear the bucket or the bucket rod when mining frequent alternating load, and repeated material lifting and unloading, and often subjected to impact loads, the stress is relatively poor, prone to failure accidents. This paper takes sunward SWE470 medium arm of hydraulic excavator as the research object, launches the research from two aspects of static strength and fatigue strength, and the movable arm mechanism and structure optimization, the main contents are as follows:
The static model of working device for structural finite element analysis is established, and the mathematical model of excavator's theoretical digging force and the force of each key hinge is established, which provides a basis for structural strength analysis and structural optimization.
A movable arm finite element model is verified by theoretical analysis and Simulation of displacement boundary conditions, and the typical working conditions and mining conditions of the composite finite element results were analyzed to determine the dynamic position of arm is relatively weak, and find the most dangerous section, provide a reference basis for improvement of the boom.
A movable arm parametric model in ADAMS, for optimization of the hinge point; the hinge point layout based on the reasonable use of APDL to establish dynamic arm solid shell model parametric finite element model, and the sensitivity analysis and structure optimization. To reduce the stress concentration through optimization, improve the stress distribution.
The stress test is carried out on the platform of SWE470. The static stress test of the boom under multiple conditions is carried out to verify the correctness of the finite element model. The dynamic stress test of the boom under typical excavation conditions is carried out, providing a real load spectrum for subsequent fatigue analysis.
The dynamic stress time course load filtering of the dangerous point of stress measuring arm test, rain flow counting and spectrum obtained in the course of treatment, the levels of circulating stress. Combined with S-N fatigue curve of arm material and static strength finite element analysis results, the application of linear nominal stress method theory. Through the fatigue analysis software MSC.Fatigue to predict the life of the boom, determine the fatigue strength of the weak area.

【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU621

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