Underwater sound radiation control by active vibration isolation: An experiment

Abstract

An experimental system, mainly including a rotary machine, four active vibration isolators and a water container, was established to investigate the role of active vibration isolation in suppressing vibration transmission as well as underwater sound radiation. Finite element analysis and experimental modal testing were employed to exhibit and validate vibration modes of the fluid-coupled structure and the radiated sound field in water. Sound field given by this validated finite element model is taken as the substitution for a real measurement. In the experiment, the fundamental frequency of the rotary machine was chosen to be nearly equal to a natural frequency of the coupled system in order to create a sound field in the water container by resonant structural vibration. The rotary machine is supported by the four electromagnetic vibration isolators, which suppress the quasi-periodical local vibration independently according to an adaptive control method. The measured results have demonstrated that low-frequency sound radiation can be reduced by local active vibration isolation.

Keywords

active vibration isolation underwater sound radiation fluid—structure interaction adaptive control

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References

Lee

H K

Park

Y S

‘A near-field approach to active control of sound radiation from a fluid-loaded rectangular plate.’

J. Sound Vibr. 196 (5) (1996): 579–593

Zhao

‘Numerical simulation of active control of structural vibration and acoustic radiation of a fluid-loaded laminated plate.’

J. Sound Vibr. 272 (2004): 109–124

Carra

Amabili

Ohayon

Hutin

P M

‘Active vibration control of a thin rectangular plate in air or in contact with water in presence of tonal primary disturbance.’

Aerospace Sci. Technol. 12 (1) (2008): 54–61

Winberg

Hansen

Claesson

‘Active control of engine vibrations in a collins class submarine.’ Blekinge Institute of Technology Research, Report No. 2003:11.

Daley

Johnson

F A

Pearson

J B

Dixon

‘Active vibration control for marine applications.’

Control Engng Practice 12 (4) (2004): 465–474

Daley

Hatonen

Owens

D H

‘Active vibration isolation in a ‘smart spring’ mount using a repetitive control approach.’

Control Engng Practice 14 (9) (2006): 991–997

Everstine

C G

Henderson

F M

‘Coupled finite element/boundary element approach for fluid-structure interaction.’

J. Acoust. Soc. Am. 87 (5) (1990): 1938–1946

G Y

‘Symmetric collocation BEM/FEM coupling procedure for 2-D dynamic structural-acoustic interaction problems.’

Comput. Mechanics 29 (2002): 191–198

Zhang

Chen

Yin

Hua

‘Active vibration isolation and underwater sound radiation control.’

J. Sound Vibr. 318 (4–5) (2008): 725–736

10.

Elliott

S J

Stothers

I M

Nelson

P A

‘A multiple error LMS algorithm and its application to the active control of sound and vibration.’

IEEE Transactions on Acoustics, Speech, and Signal Processing 35 (10) (1987): 1423–1434

11.

Kim

Park

‘Active control of multi-tonal noise with reference generator based on on-line frequency estimation.’

J. Sound Vibr. 227 (3) (1999): 647–666

12.

Mazeaud

Galland

M A

‘A multi-channel feedback algorithm for the development of active liners to reduce noise in flow duct applications.’

Mech. SystemsSignal Process. 21 (7) (2007): 2880–2899

13.

Teel

A R

Zaccarian

Marcinkowski

J J

‘An anti-windup strategy for active vibration isolation systems.’

Control Engngg Practice 14 (1) (2006): 17–27

14.

Wang

Theoretical and experimental study of active vibration isolation with an adaptive algorithm Masters Thesis, Shanghai Jiaotong University, 2008.

15.

Fahy

Gardonio

Sound and structural vibration, 2nd edition (Academic Press

Boston

2007)