本文選題：車身概念設(shè)計 + 參數(shù)化建模��； 參考：《吉林大學(xué)》2013年碩士論文

【摘要】：我國汽車產(chǎn)業(yè)已經(jīng)進入飛速發(fā)展的階段，汽車成為國民生產(chǎn)生活中的必備工具。汽車產(chǎn)業(yè)作為國民經(jīng)濟中十分重要的組成部分，成功拉動了經(jīng)濟的增長與社會的進步。在與國際品牌進行各種方式合作的背景下，我國想要成為具有先進生產(chǎn)技術(shù)和能力的汽車工業(yè)強國，就必須大力發(fā)展具有自主知識產(chǎn)權(quán)的國有品牌和車型。 汽車被動安全性能，一直是汽車研發(fā)生產(chǎn)者以及消費者所關(guān)心的重要指標(biāo)。因此，，車輛碰撞安全研究也是整個汽車研發(fā)過程中十分重要的環(huán)節(jié)。在車型開發(fā)的概念設(shè)計階段進行碰撞分析，是在設(shè)計詳細(xì)車身之前對碰撞性能進行評估，即將CAE前置，節(jié)省車型開發(fā)后期碰撞安全分析的人力和物力投入。本文基于有限元前處理軟件HyperMesh的二次開發(fā)，在車身概念設(shè)計階段，根據(jù)主要參數(shù)進行車身前部參數(shù)化建模，進而對參數(shù)化模型進行碰撞分析并根據(jù)結(jié)果進行結(jié)構(gòu)修改。 本文基于吉林省科技發(fā)展計劃項目《轎車車身部件雙模參數(shù)化集成庫建立及抗撞性快速優(yōu)化研究》（編號：20126001）以及一汽技術(shù)中心項目《乘用車碰撞參數(shù)化模型技術(shù)研究》，主要進行以下研究： （1）對HyperMesh二次開發(fā)工具Tcl/Tk語言以及Process Studio進行簡要概述，研究HyperMesh二次開發(fā)方法。將腳本語言Tcl/Tk嵌入Process Studio程序，并應(yīng)用于HyperMesh二次開發(fā)中。對車身前部碰撞結(jié)構(gòu)，包括保險杠、吸能盒、連接板以及前縱梁等部件，進行參數(shù)提取以及建模方法研究。基于HyperMesh二次開發(fā)技術(shù)，實現(xiàn)參數(shù)化模型建立的流程自動化。 （2）對車身抗撞性相關(guān)知識以及碰撞仿真分析常用的有限元求解器Ls-Dyna進行概述。在對參數(shù)化模型碰撞分析之前，應(yīng)對其進行必要的前處理。利用二次開發(fā)工具，將所進行的前處理流程模塊化，并與參數(shù)化建模模塊整合，形成完整的建模與處理模塊，實現(xiàn)輸入主要參數(shù)，就能夠生成參數(shù)化模型，并進行碰撞分析前處理的功能。本文根據(jù)合作單位提供的數(shù)據(jù)，利用所創(chuàng)建模塊建立參數(shù)化模型，并提交Ls-Dyna計算，碰撞分析結(jié)果顯示，所建立的參數(shù)化模型能夠合理反映車身前部在碰撞過程中的變形過程，在概念設(shè)計階段的抗撞性設(shè)計具有參考意義。 （3）本文利用基于正交試驗設(shè)計的二次回歸分析，近似構(gòu)建用于反映原結(jié)構(gòu)碰撞性能的代理模型。以合作單位較為關(guān)心的模型參數(shù)作為設(shè)計變量，采用遺傳算法代理模型進行優(yōu)化。優(yōu)化結(jié)果不僅實現(xiàn)了結(jié)構(gòu)輕量化，同時也提高了結(jié)構(gòu)的吸能性，并有效降低了碰撞過程中的最大碰撞力，對車身結(jié)構(gòu)修改有一定的指導(dǎo)意義。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：U461.91

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