【摘要】 利用形状记忆合金(SMA)的弹性模量随温度变化的特性和SMA超弹滞回耗能特性,设计提出一种新型SMA智能阻尼器。采用模糊控制器确定SMA智能阻尼器的SMA丝工作组数,从而瞬时准确地确定SMA智能阻尼器的刚度和阻尼的档位,并有效降低受控结构地震反应。利用MATLAB提供的模糊控制工具箱和Simulink模块建立仿真模型,数值分析某三层框架结构在无控、主动控制和模糊控制三种情况下的地震反应。仿真结果表明:在模糊控制情况下框架结构底层位移和加速度反应幅值分别降低了41%和48%,控制效果显著,接近主动控制的效果,从而验证了所设计提出的SMA智能阻尼器及其模糊控制的有效性与可靠性。更多还原

【Abstract】 The Young’s modulus of Shape Memory Alloys (SMA) is temperature-dependent, and SMA has super-elastic hysteresis behavior. Recognizing this, a novel SMA smart damper is proposed and designed. In which, the number of working groups of SMA wires is determined by employing a fuzzy controller; thereby, the stiffness and damping of SMA smart damper can be determined accurately and instantaneously, and the seismic responses of the controlled structure can be reduced. A simulation model is built using the fuzzy control toolbox and the Simulink block in MATLAB, and the seismic responses of a 3-story frame structure are investigated under no control, active control and fuzzy control. Simulation results show that the amplitudes of displacement and acceleration at the first floor of the frame decreased 41% and 48% respectively by using of fuzzy control, which is comparable to active control. So the designed SMA smart damper as well as its fuzzy controller is demonstrated to be effective and reliable.更多还原