本文選題：非線性有限元 + 碰撞仿真�。� 參考：《浙江大學(xué)》2014年碩士論文

【摘要】：推耙機作業(yè)對象載荷較大、工作狀況復(fù)雜、工作過程中經(jīng)常變換速度姿態(tài)、同時由于場地一般較為擁擠,導(dǎo)致經(jīng)常與船艙、地面等發(fā)生碰撞。上述惡劣的工作條件使得推耙機在使用中時常發(fā)生焊縫開裂、構(gòu)件變形及斷裂等破壞,其中尤其以H型架橫梁焊縫開裂更為嚴(yán)重,嚴(yán)重制約了國產(chǎn)推耙機產(chǎn)業(yè)的發(fā)展。本文以某型推耙機為研究對象,以實際工況測試數(shù)據(jù)為基礎(chǔ),以非線性有限元法進行碰撞仿真,對推耙機H型架的受力狀況及影響因素進行了詳細分析,實現(xiàn)了基于代理模型的結(jié)構(gòu)優(yōu)化工作。 全文共分六章,第一章闡述了本課題的課題來源和背景意義,系統(tǒng)地總結(jié)了國內(nèi)外在有限元碰撞仿真及結(jié)構(gòu)優(yōu)化方面的研究工作,介紹了基于代理模型的碰撞優(yōu)化設(shè)計,從而明確了本文的研究思路；第二章對有限元碰撞仿真、代理模型、實驗設(shè)計方法和優(yōu)化設(shè)計方法進行了論述；第三章通過對關(guān)鍵參數(shù)進行代換建立了推耙機有限元模型,完成了現(xiàn)場測試系統(tǒng)的搭建,通過測試數(shù)據(jù)驗證了有限元模型的正確性；第四章分析了各種工況下H型架應(yīng)力分布及橫梁尺寸對應(yīng)力的影響,并對橫梁各尺寸進行靈敏度分析,確定設(shè)計變量；第五章利用正交試驗設(shè)計方法確定試驗數(shù)據(jù),構(gòu)建代理模型,選定精度較高的模型,運用遺傳算法尋找全局最優(yōu)解；第六章作為本文的總結(jié),對本文完成的研究內(nèi)容進行概述,并討論了研究存在的不足和改進方向。
[Abstract]:The work object of the push-rake machine has the advantages of large load, complicated working condition, changing the speed and attitude in the working process, and often colliding with the cabin and the ground, etc., because the ground is generally crowded. The bad working conditions make the cracking of welds, deformation and fracture of the members often occur in the operation of the push rake machine. Especially, the cracking of the weld seam of the H-shaped frame beam is more serious, which seriously restricts the development of the domestic push rake machine industry. In this paper, based on the test data of actual working condition and the nonlinear finite element method, the impact simulation of a certain type of push-rake machine is carried out, and the stress condition and the influencing factors of the H-frame of the push-Harrow machine are analyzed in detail. The structure optimization based on agent model is realized. The thesis is divided into six chapters. The first chapter describes the origin and background significance of this topic, systematically summarizes the research work of finite element collision simulation and structural optimization at home and abroad, and introduces the collision optimization design based on agent model. In the second chapter, the finite element collision simulation, agent model, experimental design method and optimization design method are discussed; in chapter 3, the finite element model of the rake machine is established by replacing the key parameters. The field test system is built and the finite element model is verified by testing data. In chapter 4, the stress distribution of H-shaped frame and the influence of beam size on stress are analyzed, and the sensitivity of each dimension of beam is analyzed. In chapter 5, we use the orthogonal design method to determine the test data, construct the agent model, select the model with high precision, and use genetic algorithm to find the global optimal solution. Chapter 6 is the summary of this paper. This paper summarizes the research contents, and discusses the shortcomings of the research and the direction of improvement.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U653.928

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