船甲板消振作动器优化模糊控制

Optimum fuzzy control of actuator on suppressing vibration of ship deck

为了消除船舶结构由于发动机不平衡矩所引起的振动,研究了一种新型作动器及其控制算法.作动器通过利用由电机带动等速反向旋转的偏心质量所组成的电气机械装置而产生单一方向上的激励力,该激励力的幅值可通过连杆系统改变偏心质量调整偏心矩.由于激励频率及幅值可在线调节,其应用范围得到扩大,但同时使得整个系统的控制方程为非线性.利用模糊控制算法无需预知系统结构参数的特点,在作动器与发动机相位角调整方面提出了优化模糊控制算法,可依据实验数据确定控制规则,由程序进行分段线性优化.实验结果表明,所提出的优化模糊控制算法,可显著提高相位跟踪精度,缩短相位角调整时间,有效地消除了船舶结构的振动.

A novel kind of actuator and its control algorithm were studied that suppresses the vibration of ship structures resulting from the unbalanced moments of engines. The actuator produces exciting forces with an electric ma- chine in which two eccentric lump masses rotate in different directions at the same velocity as the ship＇s engine is driven, producing a resulting force that acts in a single direction. The amplitude can be adjusted with a connecting- rod system which changes the eccentric distances of the two lump masses. The vibrational frequency and amplitude can be adjusted on line, enlarging its application area so that the control equation of the entire system is nonlinear. Since fuzzy control algorithms dont require system structure parameters to be given in advance, an improved opti- mum fuzzy control algorithm was developed for adjusting phase differences between the actuator and the engine. Control rules were determined according to experiments and linearized through procedures. Experimental results show that the optimum fuzzy control algorithm can significantly improve phase tracing accuracy as well reducing ad- justment time, so that vibrations of ship structures are efficiently suppressed.