基于主动艉支承的推进轴系横向振动抑制仿真与实验研究

提出一种基于主动艉支承的推进轴系横向振动传递控制方法,以抑制水下航行器的低频声辐射。该方法将传统的艉轴承支承方式由面支承改为点支承,通过六个主动作动器抑制螺旋桨横向激励力经由艉轴承向壳体的传递。建立包含主动艉支承的螺旋桨-推进轴系-壳体耦合系统动力学模型,分析系统振动传递特性及控制策略可行性;结合自适应控制算法,计算螺旋桨横向激励下的振动传递抑制效果。构建包含主动艉支承的螺旋桨-推进轴系-壳体实验系统,进一步验证控制方法的有效性。仿真与实验结果均表明主动艉支承对于螺旋桨横向激励力经由艉轴承向壳体的传递具有明显抑制效果,可有效降低壳体表面法向振动。

Simulation and tests for lateral vibration transmission suppression of a propulsion shafting system based on active stern support

An active control method is proposed to suppress the lateral vibration transmission in a shaft-hull coupled system of underwater vehicles subject to the excitation of propeller forces. The active stern support, which uses a Stewart structure to replace the traditional surface support in the stern bearing, is employed to suppress vibration transmission from the shaft to the hull structure. The dynamic model of the shaft-hull system embedded with the active stern support is established. The characteristics of vibration transmission in the system and the feasibility of active control are analyzed and the attenuation of vibration induced by the lateral excitation of propeller forces is also calculated. An experimental system was built to verify the effectiveness of the control method. Numerical and experimental results have shown that the active stern support is able to suppress the lateral vibration transmission under the excitation of propeller forces, and the attenuation of the normal vibration of the hull structure can be achieved.