Shipboard transducer vibration isolation based on stiffness compensation and eddy current damping

Objective This paper addresses problems of shipboard transducers such as large-angle tilt during multi-dimension steering and small-space compensation suppression by proposing an isolator based on stiffness compensation (SC) and eddy current damping (ECD).

Method First, the structure of the isolator with SC and ECD is designed and dynamics modelling is carried out to clarify the requirements of the stiffness and damping design. The mechanism and parameters of the diamond-shaped spring, diaphragm spring and ECD are then analyzed. Finally, a finite element simulation is carried out, isolation performance with different parameters is simulated and the accuracy of the theory and simulation is verified by experiment.

Results The SC mechanism is verified by stiffness simulation and experiment. It is found that the introduction of a diaphragm spring can effectively compensate for the overall radial stiffness while ensuring the necessary overall axial stiffness. The ECD mechanism and law are verified by COMSOL and experiment. The vibration simulation and experiment show that the isolation bandwidth is improved by 18.24% and 36.69% with reduced stiffness, while the peak is suppressed by 79.96% and 89.94% with increasing damping.

Conclusion The proposed configuration and mechanism can solve the problem of large-angle tilt and small space, providing a feasible solution for the high-performance vibration isolation of shipboard transducers.