【摘要】 在过去三十年左右的时间里，结构保护系统受到了广大研究者的普遍关注。这种保护系统可以用来降低自然灾害（如地震、强风）对土木工程建筑的损害。由于磁流变阻尼器机械结构简单，动态范围大，能耗低、回复力大，鲁棒性良好，能够在满足不同工程项目需求的同时提供有效的结构抗震抗风手段，目前它是一种非常有前途的半主动结构减震装置。本文首先介绍了磁流变液体和装置的主要特性和优点，建立了磁流变阻尼器的伪静力轴对称模型．并将其结果和平行板模型以及阻尼器实验结果进行了比较。尽管伪静力模型对于阻尼器的设计十分有效，但是它们还不足以描述阻尼器的动态特性。对实际工程应用来说，动态响应时间是一项非常重要的性能指标。文章还讨论了影响磁流变阻尼器动态响应时间的因素，建立了基于Ｂｏｕｃ—Ｗｅｎ模型的阻尼器动态模型。同时文章也提出了优化阻尼器动态响应的途径和方法以及其实验验证。更多还原

【Abstract】 In the last three decades or so. there has been a great deal of interest in the use of structur- al protective systems to mitigate the effects of dynamic environmental hazards such as earthquakes and strong winds on civil engineering structures. One of the most promising new devices for structur- al vibration reduction is magnetorheological (MR) dampers. Because of their mechanical simplicity, high dynamic range. low power requirements, large force capacity and robustness, these devices have been shown to mesh well with application demands and constraints to offer an attractive means of protecting civil infrastructure systems against severe earthquake and wind loading. In this paper, fol- lowing an overview of the essential features and advantages of MR materials and devices, a quasi -static axisymmetric model of MR dampers is developed and compared with both the simple paral- lel - plate model and experimental results. While useful for device design, these models are not suffi- cient to describe the dynamic behavior of MR dampers. Dynamic response time is an important characteristic for determining the performance of MR dampers in practical civil engineering applications. This paper also discusses issues affecting the dynandc performance of MR dampers, and develops a phenomenological model based on the Bouc-Wen hysteresis model. Approaches and algorithms to optimize the dynamic response are investigated, and experimental verification is provided.更多还原