共查询到20条相似文献,搜索用时 296 毫秒
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汽车塑料加油口盖以保护加油口为主,在汽车加油时,加油口盖总成要能顺利开启和关闭。由于加油口盖开关频率较高,为提升用户感知质量,对其刚度要求也相应较高。文章通过对某开发车型塑料加油口盖刚度进行研究,对刚度良好且尺寸相当的同类产品其结构组成、材料属性、轮廓尺寸以及关键间隙匹配数值进行分析,对标显示某开发车型加油口盖铰链板厚度和鹅颈高度过小,导致整体刚度较弱。得到初步的改善方案后,借助计算机辅助工程(CAE)手段验证方案有效性,得出加厚铰链板厚度和增大鹅颈高度均对刚度有较好的提升效果。最终,到实车阶段的刚度试验结果显示满足设计目标要求,用户感知品质良好。综上,从正向开发的角度对标分析和优化数据,避免开模后修模改善延长开发周期以及增加改模费用。 相似文献
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为避免车身刚度设计出现突变或不连续的情况,本文探究了均匀应变能密度法在车身结构刚度设计的应用.首先,对车身关键区域进行划分,分析不同加载工况下车身结构不同区域的应变能密度,并获取其承载系数;其次,根据承载系数的大小对重点关注区域进行刚度调整;最后,基于均匀应变能密度设计准则进行结构更改,调整刚度,使得整体结构刚度均匀连... 相似文献
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以某特大桥桥墩混凝土施工中钢模板设计为背景,结合Midas Civil有限元分析软件建模仿真分析该钢模板在混凝土侧压力作用下的各构件受力,通过改变对拉杆刚度、对拉杆位置来确定钢模板整体结构的最优受力,结果表明:在一定的对拉杆刚度情况下,合理的对拉杆位置对结构整体受力有着很大的提升;增加对拉杆刚度可以加强结构受力,但该过程不是无止境的增加,而是非线性的,增加到一定刚度情况下结构受力达到一个相对稳固状态;同时提出一些在钢模板设计和检算中的主要问题并提出改善建议。 相似文献
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为提高三塔悬索桥中塔设计效率,提出基于中塔纵向刚度区间进行中塔设计的方法。该方法在总体计算模型中将中塔等效为一根弹簧,根据全桥竖向刚度和主缆抗滑要求试算纵向刚度,得到中塔纵向刚度区间;从中选择合理的初始值进行中塔设计;将中塔代入全桥计算模型进行迭代计算,调整中塔材料和几何参数直至各项指标均满足规范要求。利用已建成的4座公路三塔悬索桥对该方法的准确性进行验证,同时构建公铁两用三塔悬索桥算例,应用该方法进行中塔设计。结果表明:3座公路三塔悬索桥中塔实际纵向刚度均在本文确定的纵向刚度区间内,且取实际中塔纵向刚度时,等效模型与实际全桥模型计算的活载挠度、主缆抗滑安全系数最大差异为8.1%;公铁两用三塔悬索桥算例的中塔纵向刚度设计终值与纵向刚度初始值的差异为13.9%,与常规桥塔设计方法相比迭代次数减少,设计效率提高。 相似文献
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田口法在汽车车身骨架刚度优化中的应用 总被引:3,自引:1,他引:3
以有限元限分析为基础,运用以正交设计为基础的田口法,在保持车身骨架整体质量不变的情况下,研究了提高车身整体扭转刚度和弯曲刚度的途径,探索了参数优化和拓扑优化相结合的统计优化方法。对双层客车所作的实例分析,证实了用田口结构优化是有效的。 相似文献
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为了提高某轿车白车身弯扭刚度性能,文章采用全局灵敏度分析方法进行白车身结构优化设计。首先,分别建立白车身弯曲刚度及扭转刚度的有限元模型,进行结构性能的分析;然后,以车身部件的厚度作为分析参数,采用基于Sobol'法的全局灵敏度分析方法,获得各个部件对弯扭刚度的综合贡献度;最后,根据部件的敏感程度进行结构优化设计。结果表明,在兼顾白车身总质量的前提下,弯曲刚度提高15. 66%,扭转刚度提高12. 28%,显著提高了白车身的结构性能。 相似文献
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轿车后车门动态特性分析 总被引:1,自引:0,他引:1
轿车后车门动态特性的分析是基于后车门有限元分析模型的建立,对后车门在自由状态下进行模态分析,在四种工况下对后车门进行扭转刚度与下垂刚度的分析,通过分析,为轿车车门结构设计选择及结构优化提供理论依据。 相似文献
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Increasing fuel economy has been a central issue in the development of new cars, and one of the important strategies to improve
fuel economy is to decrease vehicle weight. In order to obtain this goal, researchers have sought to make bumpers lighter
without sacrificing strength, ability to absorb impact, or passenger safety. In this study, the effects of structural variables
on the torsional stiffness of a body bumper impact beam were analyzed for possible weight reduction. To this end, the effects
of variation of section height, increase of impact beam thickness and the addition of stays in a bumper impact beam were carefully
investigated and compared. Among these, the most effective way to increase the torsional stiffness of the bumper impact beam
was found to be increasing the section height. In addition, the potential for overall weight reduction of the impact beam
was examined by comparing the crash capability of a bumper using conventional steels with that of high-strength steel (boron
steel) with a tensile strength of 1.5 GPa. This analysis could serve as a guide to design for optimal bumper impact beam development. 相似文献
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文章基于有限元法,采用ABAQUS软件,对某SUV车型前门系统进行了CAE抗凹、窗框刚度、扭转刚度分析,分析结果显示,前门窗框刚度、扭转刚度、和抗凹性能满足设计目标。 相似文献
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基于有限元法,采用ABAQUS软件,对某商用轻卡车门系统进行了CAE模态、刚度和强度分析,分析结果显示,车门前二阶模态避开了发动机怠速频率,车门刚度和强度满足设计目标,综合评估该商用轻卡车门力学性能满足要求。 相似文献
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为了研究轿车风挡玻璃对白车身刚度的影响,建立了轿车白车身有限元模型。文章介绍了前后风挡玻璃与白车身粘接的模拟方式,对比分析了前后风挡玻璃对白车身的静态刚度影响。计算结果表明,采用定义临近区(Adjacent Region)的方式来模拟风挡玻璃与白车身的这种粘性连接是合理可行的,指出加上风挡玻璃后的轿车白车身刚度明显提高,风挡玻璃对整车扭转刚度有较大贡献。 相似文献
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Yao Shan Bettina Albers Shunhua Zhou Stavros A. Savidis 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2017,55(1):23-40
The variation of the rail support stiffness is an inherent issue of railway tracks. There is still no consensus on the influence of the rail support stiffness variation on the dynamic response of the vehicle–track system. One view indicates that changes of the support stiffness do not have considerable influence on the vehicle dynamic response. The main influence factor is the rail deflection. However, the opposite view presents that the influence of the support stiffness on the system dynamic response is obvious. Reasons that lead to the dispute of previous studies are the neglect of the influence of the excitation frequencies and a lack of understanding of stiffness sensitive zones. In this study a vehicle–track coupling model with equivalent overall support stiffness is employed to investigate the response of the vehicle to changes of the track stiffness and excitation frequencies. Results show that for each of frequencies (1–40?Hz) the dynamic response of the vehicle is only sensitive to a certain range of the support stiffness. A stiffness sensitive zone for each excitation frequency can be observed. In order to further study the influence of the subgrade on the vehicle system dynamic response a vehicle–track-subgrade model is utilised. The subgrade stiffness belonging to the stiffness sensitive zone has a significant influence on vehicle vibrations. For overall support stiffness of the rail higher than 20?kN/mm, the stiffness sensitive zones of low excitation frequencies can be avoided. 相似文献
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