共查询到19条相似文献,搜索用时 883 毫秒
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本文通过对传统汽车制动器的特性分析,根据电流变液电流变效应、工作机理及工作模型,探讨设计出一种新型汽车制动器———电流变液智能型汽车制动器,并对其结构、制动力矩的大小进行分析设计计算,有可实用性。 相似文献
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《机械工程与自动化》2016,(1)
在电流变液的电流变效应基础上,改进了剪切模式下的深孔电流变液减振器,对减振器阻尼力公式及影响因素进行了分析,推导出了切削系统动力学模型。由MATLAB软件仿真结果表明:切削系统的阻尼率变化可以通过对电流变液电场强度的改变而快速实现,从而达到抑制切削颤振的目的。 相似文献
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Yasuhiro Kakinuma Tojiro Aoyama Hidenobu Anzai Hiroharu Sakurai Kazuyuki Isobe Katsutoshi Tanaka 《Precision Engineering》2006,30(3):280-287
An electro-rheological fluid (ERF) is a functional fluid whose viscoelastic properties vary according to the intensity of the applied electric field. ERFs are mixtures of nonconductive silicone oil and inorganic/organic composite electro-rheological particles. The properties of ERFs have been exploited to control the performance of machine elements. ERFs have been applied to machine elements such as variable dampers and clutches. However, ERFs have disadvantages, namely the sedimentation of ER particles and the requirement of a seal mechanism. The sedimentation of ER particles reduces the ER effects and results in low stability of ER devices. In order to suppress the sedimentation, and thereby improve the performance of ERF devices, a new functional material called the gel-structured ERF (ERG) is developed, whose basic properties are analyzed in this study. The ER particles are suspended in the gel component, and thus will not precipitate out. This suppresses the decrease in the ER effect caused by precipitation. The ERG developed shows a large shear stress variation in response to the applied electric field. This high performance of ERG originates in a mechanism different from the ER effects of ERF. In order to elucidate the mechanism in ERG, the behavior of ER particles was observed under an electric field. The results show that the contact conditions at the interface between electrode and ERG change rapidly in response to the applied electric field, which result in a variation in shear force. On the basis of the results of a preliminary analysis, ERG was applied to the precision clamp system of an aerostatic slider, and its performance was assessed experimentally. 相似文献
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STUDY ON ELECTRORHEOLOGICAL FLUID DAMPER FOR APPLICATION IN MACHINING CHATTER CONTROL 总被引:3,自引:0,他引:3
The electrorheological fluid(ERF)is a kind of intelligent material with bright prospects for industry applications, which has viscoelastic characteristic: under the applied electric field. The dynamic model of a milling system with an ERF damper is established, and the chatter suppression mechanism of the ER effect is discussed theoretically. Both the theoretical study and the experimental investigation show that the additional damping and additioaal stiffness produced by the ERF increase with the rise in the strength of electric field E, but their influence on the cutting stability is different. Only when both additional damping and additional stiffress cooperate, the milling chatter can be suppressed quickly and effectively. In additional, an ERF dumper used on the arbor of horizontal spindle milling machine is developed, and a series of milling shatter control experiments are performed. The experimental results show that the milling chatter can be suppressed effectively by using the ER damper. 相似文献
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含智能流变材料铝合金夹层板结构的动力学特性研究 总被引:1,自引:1,他引:1
通过对一种含电流变液铝合金夹层板智能结构的动力学实验与仿真,分析和研究该结构在外电场作用下的动力特性变化。实验发现,利用外部控制条件(电场强度)的变化,可以改变结构的固有特性,如自然频率、结构阻尼等,可实现对结构的主动控制。数值分析时采用粘弹性材料等效处理方法模拟电流变材料,计算得到的结构振动特性与实验结果吻合较好。实验与仿真计算结果均表明,随着电场强度的增大,结构固有频率也随之出现上升,且增幅与场强有关;同时,电流变材料对结构振动所产生的阻尼效应不仅受外加电场影响,还与外加激励频率有关,响应控制实验结果说明电流变材料对结构在固有频率附近所产生响应的控制效果要更为明显一些。 相似文献
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An experimental investigation was performed to study the characteristics of ER(Electro-Rheological) fluid flow in a horizontal
rectangular tube with or without D. C voltage. To determine some characteristics of the ER flow, 2D PIV (Particle Image Velocimetry)
technique was employed for velocity measurements. This research found the mean velocity distributions with OkV/mm, 1.0kV/mm
and 1.5kV/mm for Re=0, 0.62, 1.29 and 2.26. When the strength of the electric field increased, the cluster of ERF was clearly
strong along the test tube and the flow rate decreased. The present results will contribute to the economical and compact
design of ER fluids system. 相似文献
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In this paper, making the best use of the features of the electro-rheological (ER) valve, a two-port pressure control valve
using ER fluids is proposed and manufactured. The ER-Valve characteristics are evaluated by changing the intensity of the
electric field and the number of electrode. As only with electrical signal change to the ER-Valve in which ER fluid flowing,
ER fluid flow is controlled, so development of simple ER-Valves have been tried. The ER-Valves and pressure drop check method
are considered to be applied to the fluid power industry. Using the manufactured pressure control valve, a one-link manipulator
with FHA (Flexible Hydraulic Actuator) is driven. As a result, it is experimentally confirmed that the pressure control valve
using ER fluids is applicable to use in driving actuator. If it applies characteristics of the ER fluids, it will be able
to apply in the control system for the ER Valve which occurs from industrial controller. After having durability test, shear
stress increased regularly because of starch particles crushed by pump and particle size that was almost the same. Moreover,
Ra of copper electrode increased about 1.56 times rather than before those of performing durability test, and Rz increased
about 2.2 times. 相似文献