基于Abaqus的推耙机工作装置碰撞仿真及结构优化

发布时间：2018-07-04 22:52

本文选题：非线性有限元 + 碰撞仿真　；参考：《浙江大学》2014年硕士论文

【摘要】：推耙机作业对象载荷较大、工作状况复杂、工作过程中经常变换速度姿态、同时由于场地一般较为拥挤,导致经常与船舱、地面等发生碰撞。上述恶劣的工作条件使得推耙机在使用中时常发生焊缝开裂、构件变形及断裂等破坏,其中尤其以H型架横梁焊缝开裂更为严重,严重制约了国产推耙机产业的发展。本文以某型推耙机为研究对象,以实际工况测试数据为基础,以非线性有限元法进行碰撞仿真,对推耙机H型架的受力状况及影响因素进行了详细分析,实现了基于代理模型的结构优化工作。全文共分六章,第一章阐述了本课题的课题来源和背景意义,系统地总结了国内外在有限元碰撞仿真及结构优化方面的研究工作,介绍了基于代理模型的碰撞优化设计,从而明确了本文的研究思路；第二章对有限元碰撞仿真、代理模型、实验设计方法和优化设计方法进行了论述；第三章通过对关键参数进行代换建立了推耙机有限元模型,完成了现场测试系统的搭建,通过测试数据验证了有限元模型的正确性；第四章分析了各种工况下H型架应力分布及横梁尺寸对应力的影响,并对横梁各尺寸进行灵敏度分析,确定设计变量；第五章利用正交试验设计方法确定试验数据,构建代理模型,选定精度较高的模型,运用遗传算法寻找全局最优解；第六章作为本文的总结,对本文完成的研究内容进行概述,并讨论了研究存在的不足和改进方向。
[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.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U653.928

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