Research Papers

Modeling and Characterization of Bio-Inspired Hydro-Acoustic Sensor

[+] Author and Article Information
Jin-Hyuk Lee

Department of Mechanical Engineering,
American University of Sharjah,
P.O. Box 26666,
Sharjah, UAE
e-mail: jinhyuk@aus.edu

Per G. Reinhall

Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195

Hwan-Sik Yoon

Department of Mechanical Engineering,
The University of Alabama,
Tuscaloosa, AL 35487-0276

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received May 20, 2014; final manuscript received January 15, 2015; published online March 13, 2015. Assoc. Editor: Marco Amabili.

J. Vib. Acoust 137(3), 031021 (Jun 01, 2015) (7 pages) Paper No: VIB-14-1182; doi: 10.1115/1.4029668 History: Received May 20, 2014; Revised January 15, 2015; Online March 13, 2015

A biomimetic miniature underwater acoustic sensor is proposed and analyzed for the measurement of directivity of underwater sound propagation. Unlike a hydrophone array, which detects propagation direction by the arrival time of sound waves, this novel sensor is based on a mechanically coupled mechanism, which amplifies the time delay of the arriving sound wave. In this paper, a mathematical model of the sensor is developed based on the finite element (FE) modeling technique, and it is used to study performance characteristics of the sensor. Effects of the fluid–structure interaction are examined through simulation of the sensor model and the results are compared with those obtained by a full scale FE model developed in a commercial software package.

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Fig. 3

Representation of the 5DOF hydro-acoustic sensor using four beam elements where numbers in circles represent elements and plain numbers represent nodes

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Fig. 2

Proposed underwater acoustic sensor design

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Fig. 1

2DOF mechanical model of hearing system of Ormia ochracea

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Fig. 5

(a) Sensor model with material and boundary conditions and (b) comprehensive FE model developed in comsol

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Fig. 11

Time delay of plane wave arriving at nodes 2 and 3 with an incidence angle of 45 deg without damping

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Fig. 12

Time delay of incident wave at 75 Hz without damping

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Fig. 4

First and second mode shapes of the hydro-acoustic sensor: (a) first mode and (b) second mode

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Fig. 6

Added mass due to fluid loading versus vibration frequency of the sensor structure

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Fig. 7

Frequency response of a sensor in water

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Fig. 8

Comparison of frequency responses of the sensor model and the comprehensive FE model in water

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Fig. 9

Phase of arriving wave at nodes 2 and 3 obtained by the sensor model without damping

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Fig. 10

Phase difference of arriving waves at nodes 2 and 3 obtained by the sensor without damping

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Fig. 13

Time delay of incident wave at 100 Hz without damping

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Fig. 14

Directional sensitivity of the sensor at (a) 75 and (b) 100 Hz without damping (α = β = 0)

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Fig. 15

Directional sensitivity of the sensor at (a) 75 and (b) 100 Hz with damping (α = 0, β = 8.54 × 10−6)

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Fig. 16

Comparison of time delay with and without damping



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