循环球式转向器疲劳性能试验设计

为了检测循环球式转向器的疲劳性能,在分析转向器工作原理的基础上,运用电液伺服材料试验机INSTRON 1251试验台与计算机控制单元,设计了转向器疲劳试验系统。研制了转向器疲劳试验工装夹具,系统加载动态响应良好,达到了转向器疲劳试验参数要求。试验运行表明:该试验设计实现了转向器疲劳性能测试,操作简便,控制精度高,为转向器结构设计与强度评估提供了基础技术支持。     

动力转向器控制阀的数学建模

本论文基于转阀式液压动力转向器,建立了动力转向器控制阀的数学模型,以便能够更好对液压动力转向器的进行分析、优化,进而提高转向器的性能.     

商用车转向器支架疲劳寿命仿真分析

为了揭示转向器支架的破坏机理,在整车实际运行工况下计算转向器支架最大受力,并在此基础上建立了转向器支架的有限元模型,在转向器质量和最大转向力矩的共同作用下对转向器支架进行静强度分析;根据S-N曲线方法、正弦载荷谱和Radioss工具对转向器支架进行疲劳寿命分析;最后将仿真结果与实际破坏形式及理化分析结果进行对比。结果表明:转向器支架满足静强度要求,但是存在局部寿命不足、一致性差的问题;仿真分析与工程实际具有较好的吻合性。     

汽车转向器专用聚脲涂料的研发

伴随国家对节能减排的要求,汽车转向器涂装有相应的技术升级需要。介绍了汽车转向器专用聚脲防护涂料产品,按聚脲涂料针对汽车转向器的应用要求进行开发,使得聚脲涂料能够适合于汽车转向器上使用,并进行了现场测试,使用效果良好。     

同步转向控制技术在电动叉车设计中的应用

简要介绍同步转向控制技术在电动叉车设计中的应用,通过电控对分别来自转向器和转向桥主销上的编码器信号进行比较处理,适时地控制电磁阀和油路的开启以对转向缸及时补油,从而实现车辆方向盘与转向轮的同步控制。     

新型汽车转向器总成性能试验台的开发

为提高汽车转向器总成装配的生产效率,减轻工人的劳动强度,降低生产成本,开发了汽车转向器总成性能试验台,它主要包括转向器总成性能试验台的技术原理、机械系统、液压系统和控制系统及软件的实现等。实际应用表明,所设计的试验台性能先进,检测效率高。     

柴达木盆地烃源岩生、排烃特征模拟研究

利用热压物理模拟实验结果并结合排烃门限理论 ,对柴达木盆地各类烃源岩的生、排烃特征进行了模拟实验研究 ,在此基础上绘制了烃源岩排烃门限判别图。研究结果表明 :①地质条件下水介质的存在有利于烃源岩生、排油气 ;②烃源岩在地史过程中存在一个向外大量排油气的门限 ,烃源岩只有进入这一门限后才能大量排油 ,在这之前生成的油均残留于烃源岩中 ;③煤、泥岩、碳质泥岩的生、排烃过程均可分为 3个不同的阶段 ,即 :生、排气态烃阶段 ,生、排液态烃和重烃气阶段 ,生、排高温裂解气阶段 ;④研究区各类烃源岩的原始有机碳生油率为 10～ 5 0 0kg/t,残留油率为 5～2 80kg/t,排油率为 0～ 2 5kg/t,生、排气率为 10 0～ 80 0m3 /t。柴达木盆地第三系下干柴沟组烃源岩在埋深为 2 2 5 0m左右进入排烃门限。     

汽车电子转向器电磁传导敏感度测试技术研究

为了实现汽车电子转向器电磁兼容设计,提出一种电磁传导敏感度测试系统。采用DSP控制技术,按照SAE标准产生异常电压实验条件和瞬变过电压实验条件,在此条件下对汽车电子转向器的各项性能指标进行综合测试。通过对测试系统及电子转向器故障诊断电路显示结果的分析,能快速找到电子转向器被电磁传导干扰攻击出现故障的部位,为进一步采取电磁干扰抑制措施,实现电磁兼容设计提供了一种有效的手段。     

汽车变速比循环球转向器设计原理

为了提高汽车转向的轻便性和机动性,本文概要地论述了一种效率高,性能良好的新式转向器——变速比循环球转向器的设计原理。重点说明转向器中变速比扇形齿轮和齿条的啮合原理,包括变速原理,变速齿轮的选择,滚动节线的建立,齿形的确定等问题。     

柴达木盆地烃源岩生、排烃特征模拟研究

利用热压物理模拟实验结果并结合排烃门限理论,对柴达木盆地各类烃源岩的生,排烃特征进行了模拟实验研究,在此基础上绘制了烃源岩排烃门限判别图。研究结果表明：①地质条件下水介质的存在有利于烃源岩生,排油气;②烃源岩在地史过程中存在一个向外大量排油气的门限,烃源岩只有进入这一门限后才能大量排油,在这之前生成的油均残留于烃源岩中;③煤,泥岩,碳质泥岩的生,排烃过程均可分为3个不同的阶段,即：生,排气态烃阶段,生,排液态烃和重烃气阶段,生、排高温裂解气阶段;④研究区各类烃源岩的原始有机碳生油率为10-500kg/t,残留油率为5-280kg/t,排油率为0-25kg/t,生、排气率为100-800m^3/t。柴达木盆地第三系下干柴沟组烃源岩在埋深为2250m左右进入排烃门限。     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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