Preliminary Investigation of Magnetic Fluid Active Damper

磁流体主动阻尼器的初步研究

• 批准号: 09555061
• 负责人: UENO Kazuyuki
• 金额: $ 4.86万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555061/
• 关键词: Magnetic fluid; Active damper; Oscillatory motion; Magnetic field; Fluid resistance; Actuator; Neuro-control

The investigations on the following 5 items are conducted.(1) Construction of an experimental apparatus for the magnetic fluid active damperThe experimental apparatus was constructed to test the suppression of a piston motion immersed in the magnetic fluid in an oscillating container (cylinder) by the control of the applied magnetic field. The piston is connected to the cylinder through a spring-mass system. The cylinder is oscillated by the exciter With frequency off = 2-10 Hz. The suppression force is induced in the magnetic fluid by applying oscillating magnetic field. The natural frequency of the system is designed to be 5Hz when the kerosene based magnetic fluid with 50% mass concentration of magnetite particles is used. As the controlling method, the neural-network controller system is introduced.(2) Dynamic characteristics of the magnetic fluid active damperThe dynamic characteristics of the active damper are obtained by using the apparatus explained in the above item (1). Neuro … More -controllers (NC) of series and parallel types are designed to control the piston oscillation. The test results show that it is possible to suppress the oscillation of the piston in this system and to give relatively good results by using the parallel type NC compared to the series type NC in the range of the low frequency smaller than the natural frequency of f = 5Hz. By using the magnetic fluid with iron-nitride particles, more efficient characteristics of the magnetic fluid active damper is obtained in comparison with the usual magnetic fluid with the magnetite particles.(3) Theoretical study of the magnetic fluid active damperThe theoretical study is conducted to understand the suppression mechanism of the oscillation and the necessary conditions of the complete suppression of the piston motion is obtained.(4) Study of frequency response curve as a magentic fluid actuatorTo investigate the dynamic characteristics of the magnetic fluid actuator, the experimental appatatus was slightly changed. The piston motion induced in the stationary magnetic fluid by the applying oscillating magnetic field. The amplitude of the oscillating motion of the piston is obtained as a function of the frequency and the magentic field strength.(5) Basic study of the oscillation of a flat plate in the magnetic fluidThe flat plate was selected to analyze simply the fluid force acting on the oscillating body. The evaluation of the viscous damping factor and the added mass coefficient was obtained and compared with the experimental results. It is clarified that an increasing rate of a fluid resistance acting on the plate due to the applied magnetic field is large in the tested magnetic fluid with the iron-nitride particles compared to the one with the magnetic particles. Less

对以下5个项目进行调查。(1)磁流体主动阻尼器实验装置的构建该实验装置被构造成测试通过控制施加的磁场来抑制振荡容器（气缸）中浸没在磁流体中的活塞运动。活塞通过弹簧-质量系统连接到气缸。气缸由激励器振荡，频率关闭= 2-10 Hz。通过施加振荡磁场在磁性流体中感应抑制力。当磁性颗粒质量浓度为50%的煤油基磁流体时，系统的固有频率设计为5 Hz。作为控制方法，介绍了神经网络控制器系统。(2)磁性流体主动阻尼器的动态特性通过使用上述项目（1）中说明的装置获得主动阻尼器的动态特性。Neuro ...更多信息 - 设计了串联和并联型控制器（NC）来控制活塞振荡。试验结果表明，在小于固有频率f = 5 Hz的低频范围内，并联型数控系统比串联型数控系统能更好地抑制活塞的振荡，并能获得较好的效果。与通常的磁铁矿颗粒磁流体相比，含氮化铁颗粒的磁流体具有更高的阻尼性能。(3)磁流体主动阻尼器的理论研究对磁流体主动阻尼器的振动抑制机理进行了理论研究，得到了磁流体主动阻尼器完全抑制活塞运动的必要条件。(4)磁流体作动器频率响应曲线的研究为了研究磁流体作动器的动态特性，对实验装置进行了微小的改动。施加振荡磁场在静止磁流体中引起的活塞运动。得到了活塞振荡运动的振幅随频率和磁场强度的变化关系。(5)磁流体中平板振动的基础研究选取平板作为研究对象，对振动体所受的流体力进行了简单的分析。得到了粘滞阻尼因子和附加质量系数的估算值，并与实验结果进行了比较。可以清楚地看出，与具有磁性颗粒的磁性流体相比，在具有铁氮化物颗粒的测试磁性流体中，由于施加的磁场而作用在板上的流体阻力的增加速率大。少

项目成果

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T.Oyama：“氮化铁磁流体中振荡平板特性的研究”第 10 届电磁学与动力学研讨会论文集。

S.Kamiyama: Fluid Micro Simulation. Asakurashoten, 148 (1997)

S.Kamiyama：流体微观模拟。

S.Kamiyama: "Magnetic Fluid Actuator" J.of the Robotics Soc.Japan. 15-3. 351-354 (1997)

S.Kamiyama：“磁流体致动器”J.of the Robotics Soc.Japan。

岡本 久美子: "磁性流体アクティブダンパの制御特性に関する研究" 日本機械学会第76期全国大会講演論文集(III). 98-3. 253-254 (1998)

冈本久美子：《磁流体主动阻尼器控制特性的研究》第76届日本机械工程学会全国会议论文集（III）253-254（1998）。

佐藤 明: "強磁性コロイド分散系の単純せん断流中での挙動に関するストークス動力学シミュレーション" 日本機械学会論文集B編. 63-613. 3017-3024 (1997)

Akira Sato：“简单剪切流中铁磁胶体分散系统行为的斯托克斯动力学模拟”，日本机械工程师学会汇刊，B 版 63-613（1997 年）。