新型磁流变阻尼器结构设计与性能分析

发布时间：2018-04-20 14:34

本文选题：磁流变阻尼器 + 结构设计　；参考：《北京交通大学》2013年硕士论文

【摘要】：磁流变液是一种新型的智能流体材料,由其制成的阻尼器具有结构简单、能耗低、反应迅速、出力大、阻尼力连续顺逆可调等优点,成为土木工程结构振动控制的新一代减震驱动装置,并已经在土木工程振动控制方面取得了初步的应用。在现有理论分析和应用现状的基础上,本文设计了一种新型的磁流变阻尼器,并对其进行了如下研究： (1)提出新型磁流变阻尼器的概念设计方案,在最大出力和阻尼力可调范围目标前提下选取了结构的基本参数,根据土木工程振动控制的要求选定了阀门类型。 (2)运用磁路欧姆定律和磁路基尔霍夫第一定律大致确定了永久磁铁的尺寸。然后应用有限元软件ANSYS,采用耦合场实体单元,建立了磁路二维有限元模型,分别模拟了注液前和注液后阻尼器的磁场分布情况,分析阻尼通道中磁场分布的长度、强度、均匀性,调整了永久磁铁的尺寸。根据磁通量的定义验证了磁路饱和情况,使阻尼通道晚于磁回路中的其他截面达到磁饱和。 (3)根据MRF-J型磁流变液的实用磁感应强度-剪切应力曲线对阻尼器的出力性能进行预估,参照Bingham粘塑性模型建立了新型阻尼器的阻尼力预估模型,并据此描绘阻尼力-位移特性曲线及阻尼力-速度特性曲线,预测阻尼力可调系数,得到了阻尼力与阀门开启程度和外部激励的关系。
[Abstract]:Magnetorheological fluid (MRF) is a new type of intelligent fluid material. The damper has the advantages of simple structure, low energy consumption, rapid reaction, large output force, and continuously adjustable damping force. It has become a new generation of vibration absorber driving device for civil engineering structure vibration control and has been applied in civil engineering vibration control. On the basis of theoretical analysis and application, a new magnetorheological damper is designed and studied as follows: 1) the conceptual design of a new magnetorheological damper is presented. The basic parameters of the structure are selected on the premise of the adjustable range of maximum output force and damping force, and the valve type is selected according to the requirements of vibration control in civil engineering. Using Ohm's law and Kirchhoff's first law, the size of permanent magnet is roughly determined. Then the finite element software ANSYSand the coupling field solid element are used to establish the magnetic circuit two-dimensional finite element model. The magnetic field distribution of the damper before and after injection is simulated, and the length and intensity of the magnetic field distribution in the damping channel are analyzed. Uniformity, the size of the permanent magnet adjusted. According to the definition of magnetic flux, the saturation of magnetic circuit is verified, which makes the damping channel reach magnetic saturation later than the other sections in the magnetic loop. 3) according to the practical magnetic induction strength and shear stress curve of MRF-J magnetorheological fluid, the damping force prediction model of the new damper is established according to the Bingham viscoplastic model. The damping force-displacement characteristic curve and damping force-velocity characteristic curve are described, the adjustable damping force coefficient is predicted, and the relationship between damping force and valve opening degree and external excitation is obtained.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.1

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