车身前部参数化模型的抗撞性分析与修改

发布时间：2018-07-04 20:15

本文选题：车身概念设计 + 参数化建模　；参考：《吉林大学》2013年硕士论文

【摘要】：我国汽车产业已经进入飞速发展的阶段，汽车成为国民生产生活中的必备工具。汽车产业作为国民经济中十分重要的组成部分，成功拉动了经济的增长与社会的进步。在与国际品牌进行各种方式合作的背景下，我国想要成为具有先进生产技术和能力的汽车工业强国，就必须大力发展具有自主知识产权的国有品牌和车型。汽车被动安全性能，一直是汽车研发生产者以及消费者所关心的重要指标。因此，，车辆碰撞安全研究也是整个汽车研发过程中十分重要的环节。在车型开发的概念设计阶段进行碰撞分析，是在设计详细车身之前对碰撞性能进行评估，即将CAE前置，节省车型开发后期碰撞安全分析的人力和物力投入。本文基于有限元前处理软件HyperMesh的二次开发，在车身概念设计阶段，根据主要参数进行车身前部参数化建模，进而对参数化模型进行碰撞分析并根据结果进行结构修改。本文基于吉林省科技发展计划项目《轿车车身部件双模参数化集成库建立及抗撞性快速优化研究》（编号：20126001）以及一汽技术中心项目《乘用车碰撞参数化模型技术研究》，主要进行以下研究：（1）对HyperMesh二次开发工具Tcl/Tk语言以及Process Studio进行简要概述，研究HyperMesh二次开发方法。将脚本语言Tcl/Tk嵌入Process Studio程序，并应用于HyperMesh二次开发中。对车身前部碰撞结构，包括保险杠、吸能盒、连接板以及前纵梁等部件，进行参数提取以及建模方法研究。基于HyperMesh二次开发技术，实现参数化模型建立的流程自动化。（2）对车身抗撞性相关知识以及碰撞仿真分析常用的有限元求解器Ls-Dyna进行概述。在对参数化模型碰撞分析之前，应对其进行必要的前处理。利用二次开发工具，将所进行的前处理流程模块化，并与参数化建模模块整合，形成完整的建模与处理模块，实现输入主要参数，就能够生成参数化模型，并进行碰撞分析前处理的功能。本文根据合作单位提供的数据，利用所创建模块建立参数化模型，并提交Ls-Dyna计算，碰撞分析结果显示，所建立的参数化模型能够合理反映车身前部在碰撞过程中的变形过程，在概念设计阶段的抗撞性设计具有参考意义。（3）本文利用基于正交试验设计的二次回归分析，近似构建用于反映原结构碰撞性能的代理模型。以合作单位较为关心的模型参数作为设计变量，采用遗传算法代理模型进行优化。优化结果不仅实现了结构轻量化，同时也提高了结构的吸能性，并有效降低了碰撞过程中的最大碰撞力，对车身结构修改有一定的指导意义。
[Abstract]:The automobile industry in our country has entered the stage of rapid development, and the automobile has become a necessary tool in the national production and life. As a very important part of the national economy, the automobile industry has successfully promoted the economic growth and the social progress. Under the background of various modes of cooperation with international brands, our country wants to become an advanced student. The automobile industry power that produces technology and capability must vigorously develop state-owned brands and models with independent intellectual property rights.
The vehicle passive safety performance has always been an important indicator of the car R & D producers and consumers. Therefore, the research on vehicle collision safety is also a very important part of the whole automobile R & D process. The collision analysis in the conceptual design stage of vehicle development is to evaluate the impact performance before the design of the detailed body. In this paper, based on the two development of the finite element preprocessing software HyperMesh, based on the two development of the finite element preprocessing software, this paper is based on the two development of the finite element preprocessing software. In the conceptual design stage of the body, the parameterized modeling of the front body of the body is carried out according to the main parameters, then the collision analysis is carried out on the parameterized model and the structural modification is carried out according to the results.
Based on the Jilin science and technology development plan project, the establishment of the dual model parameterized integrated library of car body components and the rapid optimization of the collision resistance (number: 20126001) and the technology center of the first steam technology center, the study of the vehicle collision parameterization model technology, mainly carried out the following research:
(1) a brief overview of the Tcl/Tk language of HyperMesh development tools and the Process Studio, and the study of the two development methods of HyperMesh. The script language Tcl/Tk is embedded in the Process Studio program and applied to the HyperMesh two development. The front collision structure of the body, including the bumper, the energy absorption box, the connecting plate and the front longitudinal beam, is carried out. Research on parameter extraction and modeling method. Based on the two development technology of HyperMesh, the process automation of parameterized model establishment is realized.
(2) an overview of the common finite element solver Ls-Dyna, which is commonly used in the impact resistance knowledge of the body and the collision simulation analysis. Before the collision analysis of the parameterized model, the necessary pretreatment should be carried out. The two development tools are used to modularize the preprocessing flow and integrate the modeling module with the parameterized modeling module to form a complete modeling. With the processing module and the main input parameters, the parameterized model can be generated and the pre collision analysis is processed. Based on the data provided by the cooperation unit, the parameterized model is established by the created module and submitted to the Ls-Dyna calculation. The result of the collision analysis shows that the parameterized model can reasonably reflect the front body of the body. The deformation process of the part during collision is of reference significance in crashworthiness design in the conceptual design stage.
(3) in this paper, the two regression analysis based on the orthogonal test design is used to approximate the agent model which is used to reflect the impact performance of the original structure. The model parameters are taken as the design variables which are more concerned by the cooperative unit, and the genetic algorithm agent model is used to optimize the model. The optimization results not only show the structure light weight, but also improve the structure suction. It can effectively reduce the maximum collision force in the collision process, and has some guiding significance for the modification of vehicle body structure.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U461.91

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