Research Papers

Study of Moving Sinusoidal Wave Load Across Simple Supported Beam for Sensor Structural Configuration

[+] Author and Article Information
Biaobiao Zhang

Department of Mechanical Engineering,
The University of Alabama,
Box 870276,
Tuscaloosa, AL 35487
e-mail: bzhang@crimson.ua.edu

W. Steve Shepard

Department of Mechanical Engineering,
The University of Alabama,
Box 870276,
Tuscaloosa, AL 35487
e-mail: Sshepard@eng.ua.edu

1Mr Biaobiao Zhang was a research assistant from the ME department at the University of Alabama during the period between 2007 and 2010; his research interest was acoustic sensor development.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received September 24, 2011; final manuscript received April 14, 2014; published online May 19, 2014. Assoc. Editor: Brian P. Mann.

J. Vib. Acoust 136(4), 041009 (May 19, 2014) (11 pages) Paper No: VIB-11-1218; doi: 10.1115/1.4027481 History: Received September 24, 2011; Revised April 14, 2014

A continuous structure has several response characteristics that make it a good candidate for a sensor to be used in locating an acoustic source. In this paper, based on a beam structure with simple supports on both ends, the response of the structure to transient sinusoidal wave excitations is examined analytically and also verified by a finite element method (FEM). For sensor configuration on this structure, various interesting parameters such as the aperture of the structure, material properties, and thickness are examined by evaluating their effects on structure displacement responses. Results will be used for acoustic wave identification in the future.

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Fig. 1

Arbitrary transient load F moving onto simply supported beam

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Fig. 2

Half wave load stepping onto beam, N = 1, region 1

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Fig. 3

Half wave load N = 1 on beam, region 2

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Fig. 4

Half wave load N = 1 stepping off beam, region 3

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Fig. 5

Beam vibration response under different types of wave loads, T = 0.001 s

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Fig. 6

Beam displacement influenced by different thicknesses, N = 1, L = 0.75 m

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Fig. 7

Normalized displacement of beam structure under different thicknesses for a range of lengths, t=T

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Fig. 8

Impact of wave load direction of travel

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Fig. 9

Wavenumber spectrum under different wave loads N

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Fig. 10

Wavenumber spectrum for various beam sensor thicknesses

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Fig. 11

Wavenumber spectrum for different materials

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Fig. 12

Midbeam static displacements comparison under three methods

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Fig. 13

Midbeam forced response displacement comparison under various types of wave loads

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Fig. 14

Midbeam forced response velocity comparison under various types of wave loads



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