摘要
研究磁流变阻尼器温升理论模型,为分析和改进阻尼器温度特性做铺垫。在分析磁流变阻尼器温升原理的基础上,提出两种大振幅正弦激励作用下磁流变阻尼器的温升理论模型:一种以阻尼器中的磁流变液为研究对象,根据简化的流体单元一维传热模型而建立,该模型适合筒壁较厚的磁流变阻尼器,且估算温度比实际值高;另一种以磁流变阻尼器整体为研究对象,采用集总参数法(Lumped parameter method)而建立,该模型估算温度比实际值低。两种理论模型能预测磁流变阻尼器内部温度随时间的变化范围,并通过试验验证实测温度位于这两种理论模型所确定的温度范围内。实际应用中,根据磁流变阻尼器的结构尺寸来选用合适的理论模型进行分析,也可通过对两种理论模型的温度解进行加权平均来求得精确的温度解。
The temperature rise model of magnetorheological（MR） dampers is investigated to eliminate or minimize the effect of high temperature on their damping characters. Based on the temperature rise principle of MR dampers, two different temperature rise models are developed under the large amplitude sine excitation, respectively. According to simplified one-dimensional equation of heat transfer through a fluid element, one model is developed on the MR fluid within MR dampers and is fit for MR dampers with thick-wall hydraulic cylinder, and the predicted temperature is higher than the test temperature. The other model is developed on the MR damper, and corresponding predicted temperature is lower than the test temperature. Solutions of model equations are derived for the temperature rise within the damper as a function of time to predict the temperature range within MR dampers. An experiment result shows the tested temperature is in the range of predicted temperatures. According to structural parameters of MR dampers, the proper theory model is chosen to predict the temperature in practical applications, or an exact solution can be obtain with two different temperatures weighted mean.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第8期123-128,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金(50830202
51073179)
中央高校基本科研业务费科研专项(CDJZR10120005)
国家科技支撑计划(2012BAF06B04)资助项目
关键词
磁流变液
阻尼器
温升
热传导
Magnetorheological fluid Damper Temperature rise Heat transfer
