推力轴承基座是螺旋桨纵向激励向船体传递的主要路径。针对推进轴系纵振控制问题，建立螺旋桨-轴系-推力轴承基座耦合振动模型，采用四端参数法求解模型干扰通道与控制通道的频响函数，并通过数值仿真分析主动控制效果。结果表明，在推力轴承基座上施加纵向控制力，自适应控制策略能使推力轴承基座纵向振动得到有效控制。将作动器对称安装于推力轴承基座，通过作动器输出力抵消干扰激励的影响。实验结果表明，控制方法能有效抑制推力轴承基座的纵向振动，100Hz内的功率谱峰值下降90%左右。
Abstract
The thrust bearing pedestal in a propulsion shafting is the main path for longitudinal vibration to transmit from the propeller to the hull. A propeller-shaft-thrust bearing pedestal vibration model is established to study the active longitudinal vibration control, and the four-pole parameters method is adopted to derive the frequency response functions of the disturbance and control channels, and the analysis of active control effect is done through numerical simulation. The simulation results has shown that the adaptive control strategy can reduce longitudinal vibration of the thrust bearing pedestal effectively when the longitudinal control force is exerted on the thrust bearing pedestal. To verify the control method, with research object of shafting system, actuators are mounted on the thrust bearing housing symmetrically, and response to the controller to cancel the effects of the disturbance. Experimental results demonstrate that the control method can suppress the longitudinal vibration of the thrust bearing pedestal effectively, and the peak of power spectrum decreases by about 90% within the 100Hz.
关键词
轴系纵振 /
四端参数法 /
主动控制 /
自适应算法
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Key words
shaft longitudinal vibration /
four-pole parameter method /
active control /
adaptive algorithm
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