Vibration isolation research of shipboard transducer based on stiffness compensation and eddy current damping

Objectives A isolator based on stiffness compensation (SC) and eddy current damping (ECD) is proposed, for the problem of large-angle tilt during multi-dimension steering and small-space compensation suppression of shipboard transducer. Methods. Firstly, the structure of isolator with SC and ECD is designed and the dynamics modeling is carried out, to clarify the needs of stiffness and damping design. Then, the mechanism and parameter of the diamond-shaped spring, membrane, and ECD are studied. Finally, the finite element simulation of the elements is carried out, and the isolation performance with different parameters is simulated. Results The mechanism of SC is verified by stiffness simulation, the radial stiffness is 2 orders lower than the axial stiffness of the diamond-shaped spring, and the radial stiffness is 3 orders larger than the axial stiffness of the membrane. The mechanism and law of ECD is verified by COMSOL. The vibration simulation show that the isolation bandwidth is improved by 18.24% and 36.69% with reduced stiffness, the peak is suppressed by 79.96% and 89.94% with increasing damping. Conclusions The proposed configuration and mechanism can solve the problem of large angle tilt and small space, which provides a feasible solution for high-performance vibration isolation of shipboard transducer.