柔性自适应桁架结构的振动控制方法实验研究

为提高结构对外部环境的抗干扰能力，构造了空间柔性自适应桁架结构，并对其主动控制进行了研究。通过加速度传感器测量位移的实验，建立了由dSPACE数据采集与处理系统、压电传感器、压电作动器、桁架结构和微机实时测控组成的实时计算机控制系统。基于自适应桁架结构的有限元理论，采用改进的二次积分力反馈控制方法，研究了空间柔性自适应桁架结构的振动主动控制问题。通过正弦激励进行了实时控制实验，给出了控制前后节点18x方向的位移振幅抑制变化情况及功率谱响应曲线。实验研究结果表明，该控制方案对空间柔性结构的低频大幅振动有很好的控制效果。

Experimental study on vibration control method of flexible self-adaptive truss structure

An active control method of a flexible space self-adaptive truss structure was presented to develop high performance structure systems with dynamic perturbations, which could be used with actuators and sensors to control the vibration of flexible structure. The real-time computer control experiment was based on dSPACE data acquisition and processing system, piezoelectric sensor, piezoelectric actuator, truss structure and computer measurement and controlling system. Based on the finite element theory, an improved integral plus double integral force feedback method for active vibration control of flexible space self-adaptive truss structure was developed. With the sinusoidal frequency input signal, the experiment was accomplished in time and suggested the results of displacement suppress and power spectrum density changing at the direction of 18x node and displays correspond response graph before and after controlling. The results of experiments indicated that the control strategy was correct and effective in suppressing the low frequency and large amplitude vibration of flexible space structures.