Dynamic Analysis of an Autonomous Underwater Glider with Single- and Two-Stage Vibration Isolators

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.

A Design Method for Vibration and Acoustic Reduction of the Power System in an Underwater Automobile Glider

“…3 shows the schematic diagram of the power system of the AUG with the lightweight stand-off perforated viscoelastic damping treatment. The mechanical sound of the AUG comes from the internal power systems, where the motor 22,23 and the gear pump [24][25][26] act as the main vibration source and acoustic emission. The vibration transmits to the cabin of the power system and radiates the large sound.…”

“…Previous literature shows that the vibration and acoustic radiation characteristics of the mechanical structures with the passive damping treatment and other methods [20][21][22] were extensively studied. In vibration and acoustic control applications of the AUGs, the mass and spacing of the additional damping material are strictly limited.…”

Design of a Dual-arched Structure for Low-frequency Vibration Isolation with Enhanced Quasi-Zero-Stiffness Characteristics

“…With the continuous development of 3D printing and compliant mechanisms, vibration isolation mechanisms can become more compact and reliable, and exhibit excellent vibration isolation performance [22][23][24][25][26][27]. Numerous conventional structures demonstrate intriguing nonlinear properties when subjected to conditions of significant deformations, thereby presenting promising prospects for vibration isolation.…”

Vibration Analysis and Suppression Methods of the Wing of an Underwater Glider

“…Xiao et al 20 studied the nonlinear characteristics of a T-shaped silicon rubber isolator. Liu et al 21 investigated the vibration isolation performance of one-stage and two-stage rubber isolators on the main body of an underwater glider. Song et al 22 studied the vibration behaviors of a cylindrical shell with a viscoelastic damping layer treatment under elastic boundary conditions.…”