Archives of Acoustics, 43, 2, pp. 283–295, 2018

An Experimental Approach to Vibro-Acoustic Study of Beam-Type Structures

Jeniffer TORRES-ROMERO
University of Alicante
Spain

William CARDENAS
Klippel GmbH
Germany

Jesus CARBAJO
University of Alicante
Spain

Enrique G. SEGOVIA EULOGIO
University of Alicante
Spain

Jaime RAMIS-SORIANO
University of Alicante
Spain

In this paper an alternative procedure to vibro-acoustics study of beam-type structures is presented. With this procedure, it is possible to determine the resonant modes, the bending wave propagation velocity through the study of the radiated acoustic field and their temporal evolution in the frequency range selected. As regards the purely experimental aspect, it is worth noting that the exciter device is an actuator similar to is the one employed in distributed modes loudspeakers; the test signal used is a pseudo random sequence, in particular, an MLS (Maximum length Sequence), facilitates post processing. The study case was applied to two beam-type structures made of a sandstone material called Bateig. The experimental results of the modal response and the bending propagation velocity are compared with well-established analytical solution: Euler-Bernoulli and Timoshenko models, and numerical models: Finite Element Method-FEM, showing a good agreement.
Keywords: beam; modal shape; modal analysis; MLS; bending wave propagation velocity.
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References

Beranek L., Mellow T. (2012), Acoustics: Sound Fields and Transducers, Oxford: Academic Press.

COMSOL Multiphysics (2001), COMSOL Documentation CFD Module, Version 4.3.

Crocker M.J. (2007), Handbook of noise and vibration control (M.J. Crocker, Ed.), New York: John Wiley & Sons.

Elliot S.J., Johnson M.E. (1993), Radiation modes and the active control of sound power, Journal of the Acoustical Society of America, 94, 4, 2194–2204.

Escuder E., Alba J., Ramis J. (2007), Study of the parameters of the wiener filter in near-field acoustic holography [In Spanish: Estuio de los parámetros del filtro wiener en near-field acoustic holography], Int. Mét. Num. Cálc. Dis. Ing, 23, 2, 189–203.

Ewins D.J. (1984), Modal testing: theory and practice, New York: John Wiley and Sons.

Fahy F., Garddonia P. (2007), Sound and structural vibration, radiation, transmission and response (2nd ed.), Oxford: Academic Press.

Gerges S., Arenas J. (2010), Fundamentals and noise and vibrations control, [In: Spanish: fundamentos y control del ruido y vibraciones] (2nd ed.), Florianópolis: NR Editora.

Hambric S.A. (2006), Structural acoustics tutorial – Part 1: Vibrations in structures, acoustic today, Journal of the Acoustical Society of America, 2, 4, 21–33.

Han S.M., Benoroya H., Wei T. (1999), Dymamics of transversely vibration beams using four engineering theories, Journal of Sound and Vibration, 225, 5, 935–988.

Linjama J., Lahti T. (1992), Estimation of bending wave intensity in beams using the frequency response technique, Journal of Sound and Vibration, 153, 1, 21–36.

Liu A.N. (2015), Vibro-acoustics, Volume 1, 2nd ed., Berlin Heidelberg: Science Press, Beijing and Springer-Verlag.

Mao Q., Pietrzko S. (2013), Control of noise and structural vibration. A MATLAB®-Based Approach, London: Springer.

Maynard J.D., Williams E.G., Lee Y. (1985), Near-field acoustic holography I. Theory of generalized holography and the development of NAH, Journal of the Acoustical Society o America, 78, 1395–1413.

Mazurek R., Lasota H. (2007), Application of maximum-length sequences to impulse response measurement of hydroacoustic communication systems, Hydroacoustics, 10, 123–130.

McConnell P. (2000), Transducer inertia and stinger stiffness effect on FRF measurements, Mechanical Systems and Signal Processing, 14, 4, 625–636.

Rife D.D., Vanderkooy J. (1989), Transfer-function measurement with maximum-length sequences, Jounal of the Audio Engineering Society, 37, 6, 419–444.

Schroeder M. (1979), Integrated-impulse method measuring sound decay without impulses, Journal Acoustics Society of America, 66, 2, 497–500.

Sean F.W. (2010), Techniques for implementing near-field acoustical holography, Sound and Vibration, 44, 2, 12–16.

Stan G.-B., Embrechts J.-J., Archambeau D. (2002), Comparison of different impulse response measurement techniques, Journal Audio Engineering Society, 50, 4, 249–262.

Sung C.C., Jan J.T. (1997), The response of and sound power radiated by a clamped rectangular plate, Journal Sound and Vibration, 207, 3, 301–317.

Szwerc R.P., Courtney B.B., Hambric S.A., Timothy E. (2000), Power flow in coupled bending and longitudinal waves in beams, Journal of the Acoustical Society of America, 117, 6, 3186–3195.

UNE-EN 12390-13:2014 (2014), Testing hardened concrete – Part 13: Determination of secant modulus of elasticity in compression.

Vanderkooy J. (1994), Aspects of MLS measuring systems, Journal of the Audio Engineering Society, 43, 219–231.

Veronesi W.A., Maynard J.D. (1987), Near-field Acoustic Holography (NAH) II. Holographic reconstruction algorithms and computer implementation, Journal of the Acoustical Society of America, 81, 5, 1307–1322.

Veronesi W.A., Maynard J.D. (1989), Digital holographic reconstruction of sources with arbitrarily shaped surface, Journal of the Acoustical Society of America, 85, 2, 588–598.

Vörlander M., Kob M. (1997), Practical aspects of MLS measurements in building acoustics, Applied Acoustics, 52, 3, 239–258.

Williams E.G. (1999), Fourier acoustics. Sound and near-field acoustical holography, London: Academic Press.

Workman G., Kishoni D., Moore P. (2007), Nondestructive Testing Handbook. Vol. 7, Ultrasonic Testing, Columbus, OH, USA: ASTN.




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