浅谈盘式制动器的工作原理及在重型载货汽车上的应用

制动器是汽车制动系统的主要组成部分，是汽车行驶安全性的重要部件之一。作为一种新型的制动部件，盘式制动器与传统的鼓式制动器比较，具有散热快、重量轻、构造简单、调整方便、制动效果稳定、热稳定性好、高负载时耐高温性能好等优势。随着我国汽车货运、物流的迅速崛起和壮大，重型载货汽车对刺动系统的性能要求越来越高，盘式制动器正越来越广泛地应用于重型载货汽车上。     

汽车制动钳密封性能检测的研究

汽车已成为人们日常生活及工作不可或缺的交通工具之一,在这样一个大环境下,保障汽车的行车安全,就显得尤为必要了。在汽车各部件中,其制动器是其中最为核心的一个工件之一,汽车制动器性能的优劣,对于保障汽车的稳定、安全及延长汽车使用寿命等,起着决定性作用,而在汽车制动器中,其制动钳又是其中最为关键的部件,关于制动钳,其性能通常以其密封性的高低来衡量,若汽车制动钳密封性能不佳,其将导致制动器发生渗漏情况,引发汽车制动效果下降,甚至引发交通事故,因此加大对汽车制动钳密封性能检测的相关研究,有着积极意义。该文将就盘式制动器的工作原理进行分析,在此基础上,对汽车制动钳密封性能检测系统的原理进行详细地探讨。     

制动器实验台的控制方法分析

制动系统是汽车的重要系统,为了检测制动器的综合性能,需要进行大量路试,但是在设计阶段无法路试。而传统的汽车电惯量是制动试验系统采用机械惯量盘模拟汽车运动惯量,这种系统体积大、惯量调整困难、制动化程度不高。针对这些问题,本文采用制动器试验台的控制方法分析并检测制动器的综合性能。首先,本文建立基本的常微分模型来解决电动机驱动电流的问题,其次,是根据已知附表的数据,分别对转速和扭矩与对应的时间应用MATLAB软件拟合出两个函数进而建立了能量差微分模型。     

推广之窗

机械类WTY储能弹簧制动技术及装置编号：T２０１０６７该装置是汽车气压应急制动装置，具有行车制动、驻车制动和应急制动三种功能，适用于各类气压制动的车辆。该装置集三种制动功能于一体，将原来汽车行车制动、驻车制动、应急制动和防抱死的几套装置，变为一个系统－WTY储能弹簧制动装置（停易制动器）。该技术的主要创新在于变制动系统的常开状态为常闭状态，变静态应急制动为兼有静态和动态应急制动，创造了柔性制动理论，防止制动时出现车轮抱死、侧滑、甩尾现象，使行车更加安全，制动更加可靠、稳定。该装置变制动器的常开状态为…     

基于磁流变效应的汽车ABS制动器性能研究

为了解决汽车传统摩擦式制动器存在的缺陷,并为汽车自动驾驶等主动控制提供更多参考,利用磁流变液体在施加磁场时会发生磁流变效应的特性,设计一款前轮磁流变制动器,推导出制动力矩公式,并将模糊控制和滑模变结构控制有效结合,设计汽车ABS模糊滑模变结构控制器。利用Simulink软件对基于磁流变效应的汽车ABS制动器进行建模仿真,得出滑移率、车速-轮速、制动力矩和制动距离仿真曲线。结果表明,通过合理控制施加在制动器磁流变液体上的磁场强度,可较好实现汽车ABS制动要求。     

汽车轮毂智能冷却系统设计

正汽车制动性能事关人身安全,车辆制动系统在车辆的安全方面至关重要,如何提升汽车制动性能一直都是汽车行业的重要研究课题。目前公路客车多数采用前盘后鼓式制动,制动时通过制动鼓和摩擦片相互摩擦产生阻力来制动,在此过程机械能转化成热能。当汽车在山路下山行驶时,常处于连续长时间制动状态,受鼓式制动器结构影响,散热能力差,制动过程中会聚集大量热量,摩擦片和轮毂在高温影响下发生极为复杂的变形,     

汽车电子机械制动器的效能分析

为了分析电子机械制动器（electmmechanical bloking，简称EMB）的制动效能，建立了电子机械制动器的数学模型和在水平路面上汽车制动时整车动力学模型，运用MATLAB／SIMULINK仿真软件对电子机械制动器和液压制动器（hydmulic braking简称HB）的制动性能进行了比较．结果表明：电子机械制动器的制动效能明显优于传统的液压制动器，为电子机械制动器工程开发提供了理论依据.     

浅析汽车制动系统故障诊断及维修

在分析了汽车制动故障诊断及维修对确保汽车行车安全的重要性和必要性后，结合自我多年工作经验，对引起汽车制动故障的主要原因进行了归纳总结。最后详细介绍了制动失效或不灵、制动跑偏与制动侧滑、驻车制动器失灵等常见的汽车制动系统故障的故障现象、故障原因、以及故障诊断与排除方法。     

基于复模态灵敏度分析的制动尖叫控制研究

制动器摩擦导致的制动尖叫对汽车的乘坐舒适性有着重要影响,是工业界和学术界面临的重点和难点问题。建立制动器复模态分析模型进行制动器不稳定模态特征分析,并进行系统模态的灵敏度分析,确定子结构模态参数对系统不稳定模态实部和虚部的影响,明确了制动器系统不稳定模态及尖叫发生的关键部件几何参数,为面向制动尖叫抑制的制动器子结构优化设计提供依据。优化方案的复模态仿真及系统尖叫特性试验结果分析表明,基于模态灵敏度分析得到的制动盘V槽深度优化设计方案能有效抑制盘式制动器尖叫问题。     

动漫创造首次列入合肥科研课题

6月9日，安徽神剑科技股份有限公司与合肥工业大学科教开发部签署协议，联合成立“合肥工业大学——安徽神剑科技股份有限公司汽车制动系统研发中心”，合作开发具有自主知识产权的汽车制动器产品。该“研发中心”的成立，将填补华东地区专业研发、生产汽车盘式制动器的空白。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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