共查询到20条相似文献,搜索用时 109 毫秒
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为研制电流变液作为钳位介质的大行程高精度蠕动式进给机构,以压电陶瓷作为驱动元件,沸石/硅油型电流变液作为钳位介质,研制了蠕动式压电电流变液直线式进给机构样机,并利用计算机编程对机构的进给运动进行了控制,发现机构运动中存在负位移现象并研究了压电陶瓷驱动电压、电流变液钳位电压以及电流变液充放电时间对机构负位移的影响,建立了机构的动力学模型,对影响负位移大小的因素进行了定性探讨。结果表明,机构运动过程中,极板所受的作用力主要是钳位力、阻尼力和压电陶瓷的驱动力,增大钳位力,减小阻尼力,增大驱动力同时减缓驱动力的变化速率,对减小负位移有利。 相似文献
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简要介绍了电流变液和电流变效应,以及电流变智能轴承的基本工作原理,通过分析电流变径向滑动轴承的稳态性能和挤压性能,表明电流变技术在船舶柴油机滑动轴承中具有潜在的应用前景。 相似文献
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在一类电流变液研制的基础上,根据结构减振及振动控制的要求和电流变液的性能特点,设计出了三种电流变阻尼器,并应用于不同的结构减振实验中,取得了很好的效果。研究中发现,电流变阻尼器的减振效果主要由阻尼效应和附加刚度引起的移频作用所致,减振效率依赖于电流变液的性能和阻尼器的结构设计。 相似文献
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磁流变流的发展及应用 总被引:4,自引:0,他引:4
介绍了磁流变流的组成,工作原理及其性能,并与电流变液进行了比较,从而更清楚地解磁流变液的优越性能。文章还进而阐述了磁变流液广泛的应用前景。 相似文献
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主要考察了三种丁烷超临界抽提残渣和两种渣油成分热转化产物的电流变特性以及热转化深度,杂原子及综合稠环芳烃大分子的排列对电流变效应的影响。结果表明:未经热经转化的渣油成分具有负的电流变效应; 相似文献
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电流变液体性能的试验研究 总被引:4,自引:0,他引:4
以SrTiO3/PANI合成粒子为分散颗粒,通过试验研究分析颗粒的体积分数、不同的分散介质和添加剂对基于SrTiO3/PANI合成粒子的电流变液体性能的影响。试验结果表明:蓖麻油作为分散介质与SrTiO3/PANI粒子组成的电流变液体其电流变性能良好。通过回归分析得出基于SrTiO3/PANI合成材料为粒子的电流变液体在上述条件下的屈服切应力与电场强度的关系表达式。研究结果将为同类电流变液体的工程应用提供理论依据。 相似文献
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This paper illustrates how the electrorheological damper substantially improves the performance of the ultra-precision air bearing stage. Smart materials such as electrorheological fluids have attracted many researchers’ attention because of their resistance changeable performance in different electric fields. Meanwhile, the ultra-precision air bearing stage driven by the linear-motor is characterized by zero mechanical damping and poor anti-disturbance. To solve this problem and consider the characteristics of electrorheological fluids, an electrorheological damper is proposed in this paper. The electrorheological damper’s characteristics in high electric fields are obtained based on the Eyring constitutive model, which smoothly transits from the pre-yield to post-yield region. To enhance the performance of the electrorheological damper, which takes effect only when the stage is going to decelerate or position, the on-off and sliding mode control methods design and optimize the controller. The results prove that by using the advanced sliding mode control method, the characteristics of the ultra-precision air bearing stage can be effectively improved through the introduction of the electrorheological damper. 相似文献
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Yu Zhu Songtao Jia Yaying Chen Guang Li 《Frontiers of Mechanical Engineering in China》2008,3(2):158-163
This paper illustrates how the electrorheological damper substantially improves the performance of the ultra-precision air
bearing stage. Smart materials such as electrorheological fluids have attracted many researchers’ attention because of their
resistance changeable performance in different electric fields. Meanwhile, the ultra-precision air bearing stage driven by
the linear-motor is characterized by zero mechanical damping and poor anti-disturbance. To solve this problem and consider
the characteristics of electrorheological fluids, an electrorheological damper is proposed in this paper. The electrorheological
damper’s characteristics in high electric fields are obtained based on the Eyring constitutive model, which smoothly transits
from the pre-yield to post-yield region. To enhance the performance of the electrorheological damper, which takes effect only
when the stage is going to decelerate or position, the on-off and sliding mode control methods design and optimize the controller.
The results prove that by using the advanced sliding mode control method, the characteristics of the ultra-precision air bearing
stage can be effectively improved through the introduction of the electrorheological damper. 相似文献
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Electrorheological fluid-assisted ultra-precision polishing for small three-dimensional parts 总被引:9,自引:0,他引:9
This paper deals with a new machining method (electrorheological fluid-assisted polishing) for small three-dimensional parts such as micro-aspherical lens, die and mirror. The behavior of electrorheological particles and abrasive particles in the vicinity of the tip of the tool was observed by CCD microscope, and the electric field strength, electrode shape, and type of abrasive particles were investigated. It was clear that the electrorheological effect facilitates collection of the abrasive particles at the tool tip, even while the tool is rotating. Then, electrorheological fluid-assisted micro-aspherical generator system was developed, which is capable of micro-grinding and micro-polishing on the same machine. The system demonstrated the excellent polishing performance of small area after grinding process. 相似文献
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应用电流变技术的变速器设计 总被引:2,自引:0,他引:2
设计一种运用电流变液的变速器,分析了变速器的工作原理、结构特点,研究电流变变速器主要结构参数与输入输出转矩的关系,获得影响传动系统性能的主要因素,使进一步的结构优化设计成为可能。 相似文献
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