粘滞流体阻尼器冲击缓冲特性研究
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摘要
为获得粘滞流体阻尼器冲击缓冲特性,设计并制作一种非牛顿流体粘滞阻尼器样机,而后对其进行了不同高度下的冲击缓冲实验。为从流体力学角度分析阻尼力机理,建立改进幂律模型来描述硅油的粘度特性,并通过对实验数据的拟合获得其中待定参数。采用FLUENT软件并结合动网格技术,对阻尼器流场仿真后获得冲击载荷作用下阻尼力输出特性,将之与实验结果相对比,发现结果基本一致,可用于指导阻尼器初步设计。
To obtain shock absorption characteristics of a viscous fluid damper,a non-Newtonian fluid damper was designed and made,and then shock tests were performed for it under various height conditions.To analyze the damping force mechanism from the aspect of fluid dynamics,a modified power law function model was used to describe the viscosity of silicone oil,and the parameters of the model was determined with the measured viscosity data under various shear rates.CFD software FLUENT was adopted and combined with the dynamic meshing technology to obtain the characteristics of damping force under shock conditions.By comparing the results of tests and those of simulations,it was indicated that both the results approximately match each other and they can be used to guide damper designs.
To obtain shock absorption characteristics of a viscous fluid damper,a non-Newtonian fluid damper was designed and made,and then shock tests were performed for it under various height conditions.To analyze the damping force mechanism from the aspect of fluid dynamics,a modified power law function model was used to describe the viscosity of silicone oil,and the parameters of the model was determined with the measured viscosity data under various shear rates.CFD software FLUENT was adopted and combined with the dynamic meshing technology to obtain the characteristics of damping force under shock conditions.By comparing the results of tests and those of simulations,it was indicated that both the results approximately match each other and they can be used to guide damper designs.
引文
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[4]贾九红,沈小要,杜俭业,等.粘性流体阻尼器的设计与试验[J].机械工程学报,2008,(6):194-198.JIA Jiu-hong,SHEN Xiao-yao,DU Jian-ye,et al.Design andexperimental research on fluid viscous dampers[J].ChineseJournal of Mechanical Engineering,2008,(6):194-198.
[5]王赣城,焦素娟,孙靳雅,等.弹性胶泥阻尼器的冲击实验研究及建模分析[J].噪声与振动控制,2010,(6):55-57,62.WANG Gan-cheng,JIAO Su-juan,SUN Jin-ya,et al.Shockexperiment research and modeling analysis of elastomerdamper[J].Noise and Vibration Control,2010,(6):55-57,62.
[6]胥永刚.抗冲型粘滞流体阻尼器及其动力学性能的研究[D].上海:上海交通大学,2007.
[7]靳争团.电流变阻尼器的抗冲击性能研究[D].陕西:西北工业大学,2001.
[8]胡红生,王炅,蒋学争,等.火炮磁流变后坐阻尼器的设计与可控性分析[J].振动与冲击,2010,(2):184-188,230.HU Hong-sheng,WANG Jiong,JIANG Xue-zheng,et al.Design and controllability analysis of a gun magnetorheologicalrecoil damper[J].Journal of Vibration and Shock,2010,(2):184-188,230.
[9]Machac I,Siska B,Machacova L.Terminal falling velocity ofspherical particles moving through a Carreau model fluid[J].Chemical Engineering and Processing,2000,39(4):365-369.
[10]Hsu J,Yeh S.Drag on two coaxial rigid spheres moving alongthe axis of a cylinder filled with Carreau Fluid[J].PowderTechnology,2008,182(1):56-71.
[11]Hsu J P,Yeh S J,Tseng S,et al.Drag on a sphere in aspherical dispersion containing Carreau fluid[J].PowderTechnology,2008,188(1):34-41.
[12]Bird R B,Armstrong R C,Hassager O,et al.Dynamics ofpolymeric liquids[M].Vol.1:Fluid mechanics,1987.
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