Magneto-Rheological Fluid Dampers for Structural Control

9714334戈尔丹内贾德需要创新的能量吸收保护系统，以提高结构在地震、严重风暴和其他自然人为灾害中的安全性。本项目旨在开发和实施用于结构保护的磁流变液阻尼器。研究的重点将是一种新型磁流变液阻尼器在建筑抗震中的概念验证应用。MFR阻尼器是半主动的，这决定了它含有磁流变液。阻尼器内置磁场的启动会导致阻尼器中包含的磁流变阻尼器的粘度发生快速而戏剧性的变化。被污染的物质在几毫秒内就会从液态变为半固态。其结果是一种无限可变的可控阻尼器，能够产生非常大的阻尼力。磁流变液阻尼器为结构中的地震能量吸收提供了一个有吸引力的解决方案，因为它们运行所需的功率最小，可以由电池供电。它们是制造、使用和维护的廉价设备，不需要机械、阀门，具有很大的耐温性和较长的使用寿命。该项目的重点是开发可控磁流变液阻尼器，以展示在强烈运动下保护建筑物所需的能力。研究任务包括：(1)对磁流变液阻尼器的基本性能和识别进行全面的理论和实验研究；(2)建筑用磁流变液阻尼器的设计和开发。将研究坚固性、维护、老化和热传递问题，以及(3)对几个规模的建筑系统进行概念验证实验室测试。为了保持和改善结构在强烈地震激励和/或风暴作用下的现有性能，新的或改进的技术是一个明确的解决方案。建议的磁流变液阻尼器系统将利用材料L S的最先进技术来制造一种实用、高效、廉价的抗震结构保护系统。这项研究的成功完成将有助于在设计新的和/或翻新的老化结构时理解、开发和利用创新的保护系统。

9714334 Gordaninejad Innovative energy-absorbing protective systems are needed to enhance the safety of structures in the event of earthquakes, severe storms, and other natural man-made hazards. This project aims at the developing and implementing magneto-rheological fluid (MRF) dampers for protect of structures. The focus of the research will be on the proof-of-concept utilization of a novel MRF damper for seismic protection of buildings. MFR dampers are semi-active decides that contain magneto- rhelogical fluids. Initiation of the damper's built-in magnetic field causes a fast and dramatic change in the viscosity of MRF dampers contained in the damper. The fouled changes state from liquid to semi-solid in milliseconds. The result is an infinitely variable, controllable damper capable of very large damping forces. MRF dampers offer an attractive solution to seismic energy absorption in structures because they require minimal power for operation this can be battery operated. They are inexpensive devices to manufacture, utilize, and maintain which require no mechanical, valving and have large temperature tolerance and long operational life. The focus of this project is to develop controllable MRF dampers that can demonstrate the capabilities needed for protecting buildings under strong motions. The research tasks included: (1) Comprehensive theoretical and experimental studies for basic understanding of the behavior and identification of the proposed MRF dampers, (2) Design and development of MRF dampers for building applications. Issues of robustness, maintenance, aging, and heat transfer will be investigated, and (3) Proof-of-concept laboratory tests on several scaled building systems. To maintain and improve the present performance of structures under severe seismic excitations and/or storms, new or improved technology is a clear solution. The proposed MRF damper system will take advantage of the state- of-the-art in advancement of materia l s to produce a practical, efficient, and inexpensive protective system for seismic structures. Successful completion of the research will contribute to the understanding, development and utilization of innovative protective systems in the design of new and/or retrofit of aging structures.