【作者】 杨涛；

【导师】 张红辉；

【作者基本信息】 重庆大学 ， 仪器科学与技术， 2019， 硕士

【摘要】 基于磁流变效应,磁流变阻尼器具有响应速度快、功耗低、控制范围大和结构简单等诸多优点,在土木工程、基础设施、建筑抗震和车辆工程等领域具有广泛应用前景。由于磁流变阻尼器内部运行的复杂性,阻尼器设计还存在示功特性畸变、动态响应评价困难等问题,开展阻尼器内部工作状态监测具有重要的研究意义。磁流变阻尼器运行参数监测包括位移、阻尼力、励磁电流和腔内压力,及基于监测数据推演的动态响应参数等。磁流变阻尼器运行参数监测对于探究阻尼器内部工作状态,探寻可控阻尼的基本规律具有重要价值,对阻尼器设计优化具有指导作用。基于对磁流变阻尼器运行参数监测的需要,本文采用了状态跟踪模式、动态响应模式和状态监测模式等监测方式,具体内容如下:(1)分析了磁流变液的基本特性和磁流变阻尼器的工程应用案例;概述了磁流变阻尼器的运行参数,对阻尼器运行参数的研究现状进行了综述,提出了本文的研究意义及内容。(2)利用Bingham流体本构方程,在流动模式和剪切模式下,推导了磁流变阻尼器阻尼力的计算公式;分析了正弦波位移激励下阻尼器动态响应的误差范围及动态响应的影响因素;对阻尼器补偿腔设计进行理论分析,提出了监测腔内压力的必要性。(3)搭建了运行参数监测的测试平台。实现了状态跟踪触发和动态响应触发两种不同触发电路。设计了励磁电流快速响应电路,降低线圈电感对动态响应的影响。基于VB开发了监测软件,实现了数据的采集、存储、滤波和显示等功能。(4)研究了补偿压力、激励速度和励磁电流对磁流变阻尼器运行状态、动态响应特性以及腔内压力的影响,分析了磁流变液长期静置对动态响应的影响。更多还原

【Abstract】 Based on magnetorheological effect,magnetorheological damper has many advantages,such as fast response,low power consumption,wide control range and simple structure.It has wide application prospects in civil engineering,infrastructure,building seismic,vehicle engineering and other fields.Because of the complexity of internal operation of magnetorheological dampers,there are still some problems in the design of MR dampers,such as the distortion of indicator characteristics and the difficulty of dynamic response evaluation.It is of great significance to monitor the internal working status of MR dampers.The operation parameters monitoring of the MR damper includes displacement,damping force,excitation current and cavity pressure,and dynamic response parameters derived from monitoring data.The operation parameters monitoring of the MR damper is of great value for exploring the internal working state of the damper and exploring the basic law of the controllable damping.It has a guiding role in the design optimization of the damper.Based on the need of the operation parameters monitoring of the MR damper,this paper implements monitoring methods such as state tracking mode,dynamic response mode and state monitoring mode.The details are as follows:(1)The basic characteristics of MR fluid and engineering application cases of MR damper are introduced.And the operation parameters of the magnetorheological damper are introduced.The research status of damper operation parameters is reviewed.The research significance and content of this paper are put forward.(2)Using the Bingham fluid constitutive equation,the calculation formula of the damping force of the MR damper is derived in the flow mode and the shear mode.The error range of dynamic response of MR damper under sine wave displacement excitation and the influencing factors of dynamic response are analyzed.Theoretical analysis of the design of the MR damper compensation cavity.And the necessity of monitoring the pressure in the cavity is proposed.(3)A test platform for operation parameter monitoring was built.Two different trigger circuits,state tracking trigger and dynamic response trigger,are implemented.The excitation current fast response circuit is designed to reduce the influence of the coil inductance on the dynamic response.The monitoring software is developed based on VB,which realizes the functions of data collection,storage,filtering and display.(4)The effects of compensation pressure,excitation speed and excitation current on the operating state,dynamic response characteristics and cavity pressure of MR damper are studied.The influence of long-term static displacement of MR fluid on dynamic response is analyzed.更多还原