电液振动台正弦振动自适应控制方法

Adaptive Sine Vibration Control of an Electro-hydraulic Shaking Table

电液振动台是大型结构正弦振动模拟实验的关键设备。受液压系统频宽及系统中存在的死区、摩擦力等因素影响,正弦振动实验中加速度输出信号存在跟踪精度低、波形失真度大等问题。为提高电液振动台控制精度,提出正弦振动自适应逆控制及谐波抑制复合控制策略。通过带遗忘因子的RLS算法构建自适应逆控制器,提高正弦波形的跟踪精度。基于快速块LMS算法构建双次自适应谐波抑制控制器,减小系统加速度输出信号波形失真度。最后通过振动台实验,验证了控制策略的有效性。

Electro-hydraulic shaking table is the key equipment in sine vibration test of large structure. Affected by the hydraulic system bandwidth and the existence of dead zone, friction and other factors, the acceleration output has low tracking accuracy and large waveform distortion in sine vibration test. A combination control strategy of adaptive inverse control and harmonic suppression was proposed to improve the control precision of electro-hydraulic shaking table in sine vibration test. An adaptive inverse controller is constructed based on RLS algorithm with forgetting factor to improve the tracking accuracy of sinusoidal waveform. A double adaptive harmonic suppression controller is constructed based on fast block LMS algorithm to reduce the distortion of acceleration output signal waveform. Finally, the effectiveness of the control strategy is verified by the shaking table experiment.