發(fā)布時(shí)間：2018-01-21 18:38

  本文關(guān)鍵詞： 筆記本電腦 模態(tài)分析 跌落仿真 跌落實(shí)驗(yàn) 優(yōu)化設(shè)計(jì)　出處：《東南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：筆記本電腦在日常工作學(xué)習(xí)使用時(shí),不可避免的會(huì)發(fā)生意外跌落現(xiàn)象,而造成嚴(yán)重的結(jié)構(gòu)或功能損壞,因此企業(yè)在筆記本電腦出廠前都需要進(jìn)行物理樣機(jī)的跌落測(cè)試,以驗(yàn)證其跌落性能是否滿足行業(yè)標(biāo)準(zhǔn)。傳統(tǒng)的物理跌落實(shí)驗(yàn)作用時(shí)間短且不易控制,為了降低成本,縮短產(chǎn)品生產(chǎn)周期,提高筆記本電腦抗沖擊性能,本文依托CAE技術(shù),對(duì)筆記本電腦整機(jī)進(jìn)行模態(tài)分析、跌落性能分析及優(yōu)化設(shè)計(jì)。以下是本論文的主要工作及成果：(1)利用Hypermesh軟件簡(jiǎn)化筆記本電腦三維模型,首次提出了一套通用完整的筆記本電腦有限元模型建立方法,將整機(jī)模態(tài)仿真及自由模態(tài)實(shí)驗(yàn)的結(jié)果對(duì)比,固有頻率最大誤差為7.6%,模態(tài)振型基本一致,從而驗(yàn)證了建立的有限元模型的準(zhǔn)確性。(2)基于碰撞理論,對(duì)筆記本電腦從50cm高度,選取棱跌落、角跌落、面跌落三種典型跌落姿態(tài)進(jìn)行跌落仿真,得到了跌落過(guò)程中整機(jī)各零部件間力的傳遞情況,及每一個(gè)輸出時(shí)間節(jié)點(diǎn)下的加速度、應(yīng)力、應(yīng)變、變形云圖,并得出主要結(jié)論：1.角跌落為最危險(xiǎn)跌落工況；2.頂蓋部分剛度較機(jī)座較低,對(duì)LCD保護(hù)效果差,應(yīng)在優(yōu)化中重點(diǎn)提高頂蓋部分剛度。(3)分析產(chǎn)品脆值,提出通過(guò)加速度驗(yàn)證跌落仿真結(jié)果的方法。將筆記本電腦樣機(jī)在棱跌落、角跌落、面跌落三種跌落工況下得到的加速度時(shí)間歷程曲線,與仿真所得加速度曲線進(jìn)行對(duì)比,曲線形態(tài)基本一致,最大加速度值誤差在可接受范圍內(nèi),驗(yàn)證了跌落仿真的有效性,說(shuō)明跌落仿真結(jié)果可以作為產(chǎn)品優(yōu)化的基礎(chǔ)。(4)基于模態(tài)分析,跌落仿真,跌落實(shí)驗(yàn)結(jié)果得到結(jié)論：頂蓋外殼剛度低,對(duì)頂蓋內(nèi)部零件保護(hù)效果差。以筆記本電腦頂蓋為對(duì)象,提出以下三種優(yōu)化方案：1.頂蓋外殼材料優(yōu)化設(shè)計(jì)；2.后蓋板凹槽設(shè)計(jì)；3.后蓋角部筋板拓?fù)鋬?yōu)化設(shè)計(jì)。整合對(duì)比三種方案,得到最佳頂蓋優(yōu)化模型。結(jié)果表明：在改動(dòng)質(zhì)量變化不大的情況下,優(yōu)化后的模型在角跌落、棱跌落、面跌落三種工況下,頂蓋部分所有零件(后蓋、前框、LCD支架、LCD金屬邊框及LCD)上的應(yīng)力均明顯減小,優(yōu)化效果明顯。
[Abstract]:When the notebook computer is used in daily work and study, it is inevitable that the phenomenon of accidental fall will occur, resulting in serious structural or functional damage. Therefore, enterprises need to test the drop of the physical prototype before the notebook computer leaves the factory to verify whether the drop performance meets the industry standard. The traditional physical drop test has a short time and is not easy to control. In order to reduce the cost, shorten the production cycle and improve the impact resistance of notebook computer, this paper carries out modal analysis of the whole laptop computer based on CAE technology. Drop performance analysis and optimization design. The following is the main work and achievement of this paper: 1) using Hypermesh software to simplify the 3D model of notebook computer. A set of universal and complete finite element modeling method for notebook computer is proposed for the first time. The results of modal simulation and free mode experiment show that the maximum error of natural frequency is 7.6 and the modal shape is basically the same. Therefore, the accuracy of the established finite element model is verified. (2) based on the collision theory, three typical drop postures of notebook computer from 50cm height, angle drop, angle drop and surface drop are simulated. The transmission of the force between the parts of the whole machine and the acceleration, stress, strain and deformation of each output time node are obtained. The main conclusions are as follows: 1. Angle drop is the most dangerous drop condition. 2. The stiffness of the roof part is lower than that of the base, and the effect of LCD protection is not good. Therefore, emphasis should be placed on improving the stiffness of the top cover part. 3) to analyze the brittleness value of the product. The acceleration time history curve of the notebook computer prototype is obtained under three conditions: angle drop, angle drop and surface drop. Compared with the simulated acceleration curve, the shape of the curve is basically the same, and the error of the maximum acceleration value is within the acceptable range, which verifies the effectiveness of the drop simulation. The results show that the drop simulation results can be used as the basis of product optimization. (4) based on modal analysis, drop simulation, drop experiment results show that the shell stiffness of the top cover is low. The protection effect of the interior part of the top cover is poor. Taking the top cover of the notebook computer as the object, the following three optimization schemes are put forward: 1. The optimum design of the shell material of the top cover; 2. The design of the recess of the back cover plate; 3. Topology optimization design of the corner stiffened plate of the rear cover. The optimal roof optimization model is obtained by integrating three schemes. The results show that the optimized model falls in the angle and the edge falls when the quality of the change is not changed much. The stress on all parts of the top cover (back cover, front frame LCD bracket, LCD metal border and LCD) is obviously reduced under three conditions of surface drop, and the optimization effect is obvious.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP368.32

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