Noise Transmission Characteristics of Damped Plexiglas Windows

Gibbs, Gary P.; Buehrle, Ralph D.; Klos, Jacob; Sherilyn, A

doi:10.2514/6.2002-2416

Cited by 2 publications

(4 citation statements)

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“…The addition of a constrained viscoelastic damping layer provided a significant improvement in acoustic performance for the ¼-inch thick windows. 5 The 60,2,114,2,60 window resulted in the best acoustical performance of the windows tested. However, the question of the optimum layup remained.…”

Section: Vibroacoustic Test Summarymentioning

confidence: 95%

“…Measurements of the radiated sound power and transmission loss of the damped and undamped plexiglas windows were made by Gibbs et.al. 5 A brief summary of the setup and results are provided below.…”

Section: Vibro-acoustic Testsmentioning

confidence: 99%

“…An increase in transmission loss of up to 4.5 dB over a 50 to 4000Hz frequency range was also shown. This work extends the plexiglas window study 5 to include finite element and boundary element modeling of the windows.…”

Section: Introductionmentioning

confidence: 99%

“…al. 5 shows the potential benefits of damped plexiglas windows based on comparisons of transmission loss and radiated sound power. The damped plexiglas windows were evaluated as replacements for conventional solid aircraft windows to reduce the structureborne and air-borne noise transmitted into the interior of general aviation aircraft.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Validation of Damped Plexiglas Windows for Noise Control

Buehrle

Gibbs²,

Klos³

et al. 2003

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Windows are a significant path for structure-borne and air-borne noise transmission in general aviation aircraft. In this paper, numerical and experimental results are used to evaluate damped plexiglas windows for the reduction of structureborne and air-borne noise transmitted into the interior of an aircraft. In contrast to conventional homogeneous windows, the damped plexiglas windows were fabricated using two or three layers of plexiglas with transparent viscoelastic damping material sandwiched between the layers. Transmission loss and radiated sound power measurements were used to compare different layups of the damped plexiglas windows with uniform windows of the same nominal thickness. This vibro-acoustic test data was also used for the verification and validation of finite element and boundary element models of the damped plexiglas windows. Numerical models are presented for the prediction of radiated sound power for a point force excitation and transmission loss for diffuse acoustic excitation. Radiated sound power and transmission loss predictions are in good agreement with experimental data. Once validated, the numerical models were used to perform a parametric study to determine the optimum configuration of the damped plexiglas windows for reducing the radiated sound power for a point force excitation.

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Section: Vibroacoustic Test Summarymentioning

confidence: 95%

Section: Vibro-acoustic Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and Validation of Damped Plexiglas Windows for Noise Control

Buehrle

Gibbs²,

Klos³

et al. 2003

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

Self Cite

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Determination of transmission loss of materials from array measurements using nearfield acoustical holography/inverse boundary element methods in a transmission loss facility

Williams

Valdivia

Herdic

et al. 2005

The Journal of the Acoustical Society of America

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A new approach for the measurement of transmission loss based on NAH is discussed in this paper. Two array configurations were tested to determine the transmission loss of sound isolation materials applied to an aircraft fuselage panel in Boeing’s interior noise test facility (INTF). The first configuration consisted of a 120 element planar array positioned conformal to the fuselage panel surface in the anechoic side of the TL facility. A second configuration used 50 microphones in a spherical array of diameter 0.4 meters placed in front of the panel. The normal intensity on the surface of the fuselage panel isolation layer was reconstructed using NAH/IBEM (nearfield acoustical holography/inverse boundary element methods) using partial fields generated from a set of reference accelerometers. The panel excitation was random plane wave fields generated in the reverberation room of the TL facility. This new approach measures the TL in narrow bands or 1/3 octave bands from 50 to 2 kHz, and is shown to be very accurate when compared with conventional TL measurements. This approach also provides the normal panel vibration for each partial field so that panel modes can be uncovered and studied. Furthermore, the spherical array provides a reconstruction of the vector acoustic intensity in the volume in front of the panel so that the magnitude and direction of the transmitted energy fields can be mapped.

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Noise Transmission Characteristics of Damped Plexiglas Windows

Cited by 2 publications

References 1 publication

Modeling and Validation of Damped Plexiglas Windows for Noise Control

Modeling and Validation of Damped Plexiglas Windows for Noise Control

Determination of transmission loss of materials from array measurements using nearfield acoustical holography/inverse boundary element methods in a transmission loss facility

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