Development of Self Learning Device to Control Seismic Response of Civil Structures

研制了一种无外置蓄能器的小型可变阻尼器。通过一系列标定试验，建立了可变阻尼器的力学模型，给出了阻尼力、活塞速度和气门开度之间的关系。根据观测到的阻尼器特性的力学模型，推导出产生阻尼力的控制算法。该算法无需反馈机制，直接根据测得的活塞速度和目标阻尼力来确定气门开度。通过建立阻尼力与活塞位移之间的各种滞回关系，验证了所开发的控制系统的有效性。该系统由五个单元组成，即地震运动发生器、结构响应分析仪、控制信号发生器、控制力发生器和数字滤波器。部分单元由数字信号处理器(DSP)或实际结构模型和控制装置组成。该系统对结构控制研究领域中的各种实验都具有很强的适应性，因为我们可以通过在系统中组合适当的单元来模拟各种情况。所开发的模拟器在具有主动质量驱动系统的结构模型中的应用表明了该系统的有效性。

A small-size variable damper without external accumulator was developed. A series of calibration tests have been conducted to develop a mechanical model of variable damper which gives the relationship among damping force, velocity of piston and valve opening ratio. The control algorithm to generate damper force is derived from mechanical model of the observed damper characteristics. The feature of the algorithm to determine the valve opening ratio is very simple without feedback mechanism, which is determined directly from measured piston velocity and the targeted damping force. The efficiency of developed control system were proved by producing various types of hysteric relationship between damping force and piston displacement.We developed a hybrid simulation system to be used for structural control analyzes and experiments. There are five units in the system which are the seismic motion generator, the structural response analyzer, the control signal generator, the control force generator and digital filters. Part of the units is composed of either of a digital signal processor (DSP) or an actual model of structure and a control device. The system is highly adaptable to all types of experiments in the structural control research field because we can simulate various situations by combining proper units in the system. The application of developed simulator to a structural model with the active mass driver system reveals an efficiency of this system.