Semi-Active Control of Variable Stiffness for Building Structures

9625979 Nagarajaiah该项目已提交给“性能、安全和危害缓解研究的结构控制”竞赛。 本论文的主要工作是利用一种新型的半主动连续变刚度（SACVS）装置来发展变刚度结构系统，该装置能够连续、平滑地改变结构的刚度和频率，在地震和风激励下不产生冲击力，并保持非共振状态。 该项目的主要目标是：通过开发分析模型和实验校准这些模型，表征线性结构和非线性SACVS装置组合的非线性动力学特性;开发基于智能控制策略（如神经网络）的控制算法;对结构系统中的SACVS装置进行振动台试验;并通过比较其受控和非受控响应以及与完全主动系统相比来评估SACVS系统的有效性。 这项研究的结果将有助于创新的半主动连续变刚度系统的发展和它们的应用结构控制，这将需要更少的功率来操作，并将克服现有的控制系统的局限性。 ***

9625979 Nagarajaiah This project was submitted to the "Structural Control for Performance, Safety and Hazard Mitigation Research" competition. The work centers on the development of variable stiffness structural systems using a novel semi active continuous variable stiffness (SACVS) device which varies the structural stiffness and frequency continuously and smoothly, without inducing impulsive forces and maintaining nonresonant state under seismic and wind excitation. The main objectives of the project are: to characterize the non-linear dynamics of the combined linear structure and nonlinear-SACVS device by developing analytical models and calibrating these models experimentally; to develop control algorithms based on intelligent control strategies such as neural networks; to perform shake table testing of the SAVCS device in a structural system; and to evaluate the effectiveness of the SACVS system by comparing its controlled and uncontrolled response, and as compared to a fully active system. Results from this research will contribute to the development of innovative semi-active continuous variable stiffness systems and their application to structural control which will require less power to operate and will overcome limitations of existing control systems. ***