磁流变阻尼器长期力学性能研究

发布时间：2018-04-01 15:15

本文选题：磁流变阻尼器　切入点：修正模型　出处：《湖南科技大学》2017年硕士论文

【摘要】：磁流变阻尼器是一种新型的半主动耗能减振装置,具有结构简单,能提供连续、可顺逆调节的阻尼力,以及大的可调范围、响应速度快等优点,近十多年来在结构工程中得到广泛应用。磁流变阻尼器应用的自然环境非常恶劣,在长期工作中其性能会不断退化,影响减振效果,其长期的力学性能是工程界非常关注的问题之一。为了研究长期使用后的磁流变阻尼器的力学性能,本文选取了30个工作了十年的磁流变阻尼器,开展了力学性能实验,与新阻尼器进行了性能对比分析,并针对其力学模型修正及修正模型参数优化、性能退化原因等方面开展研究,主要研究内容包括:(1)总结了国内外阻尼器对大跨度斜拉桥拉索振动控制的研究与应用现状,并对磁流变阻尼器的基本理论与研究进行了总结与分析,重点总结了磁流变阻尼器力学模型方面的相关研究工作。(2)本文对工作了十年的RD-1005型磁流变阻尼器进行了力学特性研究,主要是通过MTS材料试验机实验,得到的实验数据并与新RD-1005型磁流变阻尼器实验数据进行对比分析,并总结了不同电压、不同振幅、不同频率下的力学特性,例如:力的幅值、等效阻尼系数等。(3)分析了新旧磁流变阻尼器力学性能的影响因素及其力学性能降低的原因,主要是从磁流变液的沉淀情况对其力学性能的影响、阻尼器的安装倾角对其长期使用的影响以及特粉颗粒氧化情况等方面进行了分析。(4)根据实验得到的结果,提出了磁流变阻尼器力学Spencer修正模型,其修正模型能更好的描叙旧磁流变阻尼器的力学特性,并运用粒子群算法进一步优化Spencer修正模型中的参数,得到更能体现旧阻尼器的力学性能的模型参数。
[Abstract]:Magnetorheological damper is a new type of semi-active energy dissipation device. It has the advantages of simple structure, continuous damping force, adjustable damping force, wide adjustable range and high response speed. Magnetorheological dampers are widely used in structural engineering in recent ten years. The natural environment of Mr dampers is very bad, and their performance will degrade continuously in long-term work, which will affect the effect of vibration reduction. In order to study the mechanical properties of magnetorheological dampers, 30 magneto-rheological dampers, which have been working for ten years, have been selected in this paper. The performance of the new damper is compared with that of the new damper. The modification of the mechanical model and the optimization of the model parameters, the cause of the performance degradation and so on are studied. The main research contents include: (1) the research and application of damper to cable vibration control of long-span cable-stayed bridge are summarized, and the basic theory and research of magneto-rheological damper are summarized and analyzed. In this paper, the mechanical properties of RD-1005 magneto-rheological dampers, which have been working for ten years, are mainly studied by MTS material testing machine. The obtained experimental data are compared with the experimental data of the new RD-1005 magnetorheological damper, and the mechanical properties of different voltages, amplitudes and frequencies, such as the amplitude of the force, are summarized. The influence factors of mechanical properties of new and old magnetorheological dampers and the reasons for the decrease of their mechanical properties are analyzed, mainly from the effect of the precipitation of magnetorheological fluids on the mechanical properties of the new and old magnetorheological dampers. The influence of installation inclination angle of damper on its long-term use and the oxidation of powder particles are analyzed. (4) based on the experimental results, a modified Spencer model for magneto-rheological damper mechanics is proposed. The modified model can better describe the mechanical properties of the old Mr dampers and further optimize the parameters of the Spencer modified model by using particle swarm optimization algorithm to obtain the model parameters which can better reflect the mechanical properties of the old dampers.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3

【参考文献】