Abstract
Vibrations from the power system can significantly affect the working performances (ocean observation) of autonomous underwater gliders (AUGs). In order to reduce the vibration transmission from vibration sources to the precision instruments in AUGs, single- and two-stage vibration isolator rings are designed in this paper. The dynamic models of the single- and two-stage vibration isolation of the AUG are presented. The force transmission ratio of the AUG is calculated in MATLAB code. The influences of the isolator and the structure stiffness are analyzed. The dynamic stiffness of the designed isolators, as an important design parameter, is calculated using the finite element method. The influence of the designed parameter on the dynamic stiffness of the rubber ring isolator is discussed. The coupled vibro-acoustic finite element method is used to analyze the vibration and acoustic response of an AUG with the single- and two-stage vibration isolators. The insertion loss is calculated in order to assess the vibration isolation performance of the single- and two-stage vibration isolators. The results from the dynamic models and the finite element models both show that the vibration isolation performance of the two-stage vibration isolator ring performs better than that of the single-stage vibration isolator ring.
Highlights
As a new type of underwater vehicle [1,2,3,4,5,6,7], autonomous underwater gliders (AUGs)—driven by a centroid-adjusting mechanism and buoyancy-adjusting mechanism, and not an external propulsion system—have the advantages of a low energy consumption, low cost and great endurance
The results showed the gear-meshing frequency from the oil pump in the buoyancy-adjusting mechanism would massively affect the turbulence observation
In theAUG, AUG,the thevibration vibration energy is contributed from the power system and transIn the energy is contributed from the power system and transmitted mitted to the battery and the wing
Summary
As a new type of underwater vehicle [1,2,3,4,5,6,7], autonomous underwater gliders (AUGs)—driven by a centroid-adjusting mechanism and buoyancy-adjusting mechanism, and not an external propulsion system—have the advantages of a low energy consumption, low cost and great endurance. The AUGs can be propelled by changing the buoyancy and centroid. The main vibration and acoustics of the AUGs come from the internal mechanical vibrations, as the motions of the gears [10,11,12], shaft, and bearings generate large vibrations and acoustics [13,14]. Song et al [15] studied the influence of the buoyancy-adjusting mechanism on the turbulence observation by using an experiment. The results showed the gear-meshing frequency from the oil pump in the buoyancy-adjusting mechanism would massively affect the turbulence observation. Wang et al [16] discussed the feasibility of the application of conducting a self-noise test. The experimental results showed the signals rece vector hydrophones is interfered with by the self-noise produced by the mechani vector hydrophones to underwater gliders by conducting a self-noise test.
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