共查询到16条相似文献,搜索用时 203 毫秒
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磁流变液是一种在外加磁场作用下流变特性发生急剧变化的新型智能材料,且这种转变可控、连续、训逆,具有广阔的应用前景。本文对磁流变液的作用原理进行了介绍,对其在车辆半主动悬挂系统中的应用进行了综述,阐述了其开发重点。 相似文献
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汽车磁流变液减振器阻尼力计算方法 总被引:8,自引:0,他引:8
针对磁流变液在剪切流动中存在剪切稀化特性,根据流体力学N-S方程,建立了基于Her-schel-Bulkley模型的准稳态平板Poiseuille流动方程,得出了磁流变液在阻尼通道中流动的速度分布函数,分析了磁流变液的剪切稀化效应对阻尼通道磁流变液流动的影响,推导了汽车磁流变液减振器阻尼力计算表达式,对汽车磁流变液减振器产生的阻尼力进行理论预测研究。按照长安之星微型汽车技术要求,设计和制作了微型汽车磁流变液减振器,并对其进行了试验测试,测试结果表明:所提出的分析方法是可行的。 相似文献
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阐述了磁流变效应的机理,概括了磁流变技术的应用研究进展,着重介绍了磁流变技术在车辆工程中的应用研究现状;结合磁流变技术的研究现状及汽车工业的发展,对磁流变技术在车辆工程领域的应用前景及发展方向作了展望。 相似文献
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根据磁流变液的流变机理和性能要求,讨论了磁流变液的分散介质、分散相及添加剂等成分的选择原则及各种成分对磁流变液性能的影响。指出影响磁流变液稳定性的主要因素是颗粒沉降、颗粒结团及载液温度稳定性,并阐述了提高磁流变液稳定性的几种方法。 相似文献
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设计了一种汽车轮内叶轮式磁流变液制动器,推导出该制动器的制动力矩计算方法,并在Matlab/Simulink环境下建立仿真模型,分析了制动器结构参数对制动力矩的影响。结果表明,叶轮式磁流变液制动器工作模式为剪切与流动的混合模式,其制动力矩与磁感应强度呈现对数变化规律,与工作间隙呈现负指数变化规律;叶片的径向尺寸、叶片数量和叶片厚度对制动力矩都有较大影响。所设计的汽车磁流变液制动器能够满足一般小型汽车的制动力矩需求。 相似文献
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化磁流变液(MR)的半主动悬架系统中,磁流变液(MR流体)这种悬浮体在零磁场条件下呈现出低粘度的流体特性。而在强磁场作用下,呈现了高粘度、低流动性的特性,由于磁流变液属可控流体,磁流变是瞬间的、可逆的,而且其磁流变后的剪切强度和磁场强度具有稳定的对应关系。 相似文献
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应用于汽车减振的磁流变液阻尼器的设计原理 总被引:6,自引:0,他引:6
应用智能材料磁流变液(MR)构造出的半主动悬架减振系统,可以用于对车辆振动的控制。MR流体具有的独特性质在于:在强磁场的作用下,可由牛顿流体变为粘塑流体,而变液阻尼器则具有结构简单、体积小、工作连续可逆,能耗小等优点。本文介绍了磁流变液的材料特性,建立了磁流变液阻尼器的阻尼力数学模型,并提出设计变阻尼器时参数的选取原则。 相似文献
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F. Bayat A. Fadaie Tehrani M. Danesh 《International Journal of Automotive Technology》2012,13(5):809-816
Proportional hydraulic valves (PHVs) have remarkable applications in different branches of industry. These valves can control an oil hydraulic system. One of the most important factors affecting a proportional solenoid (PS) is the geometry that affects its magnetic force with respect to its plunger position. Other effective factors include the size of the air gap, the current density and various soft magnetic materials that have different B-H (flux density versus field intensity) curves. Electromagnetic analysis (EMA) is used to enhance the reliability and accuracy of the PS and to reduce the total cost. In this paper, a range of PSs are software package with different air gaps, dimensional parameters, current densities and soft magnetic materials. The magnetic flux density and force are calculated using a finite element method (FEM), and the results are compared with the experimental results of an actual PS. 相似文献
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电流变流体材料及其在汽车工程中的应用 总被引:1,自引:0,他引:1
电流变流体是一种极具发展前景的智能材料,通常由不导电的母液和均匀散布其中的电介质微粒组成。它的力学性能随外电场的变化而改变,因而,在工业上具有广阔的应用前景。本概述了电流变流体材料当前的研究现状和发展水平,涉及的内容有:电流变流效应的机理,典型特性,在汽车工程中的应用,存在的问题及展望。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):449-462
Engine mounts are used in the automotive industry to isolate engine and chassis by reducing the noise and vibration imposed from one to the other. This paper describes modelling, simulation and design of a semi-active engine mount that is designed specifically to address the complicated vibration pattern of variable displacement engines (VDE). The ideal isolation for VDE requires the stiffness to be switchable upon cylinder activation/deactivation operating modes. In order to have a modular design, the same hydraulic engine mount components are maintained and a novel auxiliary magneto-rheological (MR) fluid chamber is developed and retrofitted inside the pumping chamber. The new compliance chamber is a controllable pressure regulator, which can effectively alter the dynamic performance of the mount. Switching between different modes happens by turning the electrical current to the MR chamber magnetic coil on and off. A model has been developed for the passive hydraulic mount and then it is extended to include the MR auxiliary chamber as well. A proof-of-concept prototype of the design has been fabricated which validates the mathematical model. The results demonstrate unique capability of the developed semi-active mount to be used for VDE application. 相似文献