基于有限元分析的赛车车架结构轻量化设计

通过对某方程式赛车车架结构的有限元分析,来实现赛车车架结构的改进和轻量化设计.利用CATIA软件平台建立某方程式赛车车架三维实体模型,运用CAE分析软件对其进行单元选取和网格划分,建立车架的有限元分析模型,通过对车架静态条件下弯曲工况、扭转工况的分析,找到车架弯曲强度和扭转刚度富裕部位,通过减少管件的使用数量、减薄相对应管材的壁厚、减小直径,达到车架结构优化和轻量化设计目标.     

基于Hyperworks某乘用车白车身刚度及模态分析

为研究车身的强度、刚度以及模态的性能指标,避免车身在使用过程中出现塑性变形和局部断裂的现象,利用Hyperworks软件对车身进行有限元仿真分析.通过建立弯曲、扭转以及模态工况,最终获取整车的刚度、模态频率及振型.有限元分析结果显示,白车身有良好的弯曲刚度,扭转刚度偏低;低阶模态频率高,有良好的低频特性.在后续改进中应采取相应措施提高其扭转刚度.     

G324牵引车车架弯曲工况强度分析及改进

为了对G324牵引车的车架进行强度分析及改进,根据牵引车的实际工况,选择对车架影响较大的弯扭工况进行分析,利用HyperMesh有限元软件建立了某牵引车车架结构有限元分析计算模型。通过计算得出该车架在这两种工况下的应力分布云图,对车架进行改进并分析增加L板和将鞍座瓦轮板改为平板以及取消加强板3种模型的实际情况,得出满足车架强度要求的具体模型,为牵引车车架的设计及改进提供参考依据。     

轿车车身强度及刚度有限元分析

为了便于修改和调整轿车整车的有限元模型,提高有限元模型生成速度,对轿车车身和车架的强度和刚度进行有限元分析。应用参数化曲面造型技术、参数化变量技术实现整车的映射网格自动剖分,应用薄壳单元和厚壳单元模拟车身和车架,建立了全板壳单元轿车车身骨架有限元计算模型。采用映射网格单元来分析计算,优化处理存储数据,使得车身、车架变形和应力分布的分析计算速度更快、精度更高,并且获得更好的分析结果。在弯曲、扭转工况下对轿车车身进行强度、刚度分析,计算出变形和应力最大部位,并依据最大应力区,提出改进方案,降低了最大应力。     

基于壳梁单元耦合理论的车身有限元分析及其轻量化设计

在梁单元的基础上,采用壳单元和梁单元混合模型,并对壳元和梁元的边界耦合的刚度矩阵进行了详细的推导.利用通用有限元分析软件ANSYS计算了天然气公交客车在弯曲、扭转、转弯、刹车4种工况下的应力及变形.根据计算结果提出了轻量化的方案,并对应力集中点进行了结构优化,利用ANSYS对改进后的车型进行计算,结果表明改进方案可行.     

基于HyperWorks的某轿车白车身刚度分析及优化

本文以某轿车白车身为研究对象,使用有限元分析软件HyperWorks建立其有限元模型,再对白车身的扭转工况和弯曲工况进行分析,并根据评价指标对该白车身的刚度进行分析评价,得出该轿车白车身的扭转刚度满足国外轿车较高设计要求,但弯曲刚度偏低。然后对白车身进行尺寸优化,优化后虽然扭转刚度有些减小,但增加了弯曲刚度,减小了白车身质量,达到了在白车身轻量化同时尽量少牺牲白车身刚度的目标。     

基于广义模块化的客车底架参数化设计

针对客车传统模块设计方法的不足,基于广义模块化理论对客车底架进行参数化设计。利用广义结构模块矩阵对客车底架进行模块划分,结合用户需求矩阵实现总长为10.0~12.0 m同系列客车车型底架的设计。采用HyperWorks软件对所设计的系列车型整车骨架建立有限元模型,通过2种工况下强度和刚度分析验证设计的可行性。结果表明:广义模块化设计理论在客车底架的设计上具有良好的适用性;在弯曲及扭转工况下的最大应力值、整车的弯曲刚度和扭转刚度均与底架中段模块长度的改变呈现线性关系;总长为10.0,10.5和11.0m的3部车型能够满足相关设计要求。     

大学生方程式赛车车架仿真分析

本文运用CAE技术对赛车车架进行了仿真分析,分析了车架工作的载荷及工况情况,利用Solidworks三维软件对赛车车架进行实体建模,并导入到ANSYS,利用ANSYS进行仿真分析,对车架在扭转、加速、制动、侧倾四种工况下,进行了强度与刚度仿真分析,并提出了改进建议。     

货车扭转载荷的计算与分析

本文把悬架和车架作为子结构，建立了汽车扭转力学模型；推导了几种常见扭转工况下汽车的受力计算公式；分析了悬架与车架扭转刚度的匹配对车架变形和受力情况的影响．本文所得出的结论，可作为结构强度有限元分析的一种补充及设计者选择汽车设计参数的参考依据     

2CZ-21车架的优化设计

分析了甘蔗种植机车架在弯曲和扭转组合工况下的应力和应变分布,讨论了车架在危险工况下的强度和刚度问题,提出修改意见,并对原有结构优化,进行了后车架结构的轻量化方案设计。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that