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3 edition of On the effect of acoustic coupling on random and harmonic plate vibrations found in the catalog.

On the effect of acoustic coupling on random and harmonic plate vibrations

On the effect of acoustic coupling on random and harmonic plate vibrations

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Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Acoustical engineering.

  • Edition Notes

    StatementA. Frendi, J.H. Robinson.
    SeriesNASA technical memorandum -- 107740.
    ContributionsRobinson, J. H., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15384901M


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On the effect of acoustic coupling on random and harmonic plate vibrations Download PDF EPUB FB2

The effect of acoustic coupling on random and harmonic plate vibrations is studied using two numerical models. In the coupled model, the plate response is obtained by integration of the nonlinear plate equation coupled with the nonlinear Euler equations for the surrounding acoustic fluid. Effect of acoustic coupling on random and harmonic plate vibrations.

large amplitude vibrations and random response of symmetrically laminated plates. Plate acceleration and sound transmission due to random acoustic andboundary-layer excitation. Ferdinand W. Grosveld ; AIAA Journal Vol. 30, Cited by: In most structural dynamics analyses, there is little discussion about the effect of the surrounding acoustic fluid on the response of a structure to a given excitation field.

Frendi, etal. 22,23 showed that a strong coupling between plate vibration and the surrounding flow fields exists at high excitation levels. The effect of acoustic coupling on random and harmonic plate vibrations is studied using two numerical models.

In the coupled model, the plate response is obtained by integration of the nonlinear plate equation coupled with the nonlinear Euler equations for the surrounding acoustic : Abdelkader Frendi and Jay Robinson.

We On the effect of acoustic coupling on random and harmonic plate vibrations book that for low excitation levels, so that the plate response is essentially linear, the effect of acoustic coupling is negligible.

However, as the level of the loading increases, the radiated pressure from a plate undergoing non-linear or chaotic vibrations is found to propagate non-linearly into the by: [1] A.

Frendi, J.H. Robinson: On the effect of acoustic coupling on random and harmonic plate vibrations. NASA Technical Memorandum (). NASA Technical Memorandum (). [2] A.F. Seybert, T.W. Wu and W.L. Li: A coupled FEM/BEM for fluid Author: Yi Feng Xu, Jun Wang.

Analyzing Vibration with Acoustic– Structural Coupling FSI techniques using acoustic elements efficiently compute natural frequencies, harmonic response and other vibration effects in structures containing fluids.

By Marold Moosrainer, Head of Consulting, CADFEM GmbH, Munich, Germany When designing equipment such as vessels, tanks, agitators. In this way, three strongly coupled physical domains can be solved simultaneously: piezo- electric, structural and fluid.

Coupling structural elements to acoustic elements in this manner allows for transient analysis and, even more important, for modal and harmonic analysis in the frequency Size: KB. The effect of acoustic coupling on random and harmonic plate vibrations is stud- ied using two numerical models.

In the coupled model, the plate response is obtained by. On the effect of acoustic coupling on random and harmonic plate vibrations book and supersonic mean flows are considered together with a random and harmonic acoustic excitation.

In the first physical problem and using a random acoustic excitation, the results show that at low excitation levels the response is unaffected by the mean flow Mach by: 5. 20 2 Wave equation, speed of sound, and acoustic energy that the mass source term m and the external force density f in () and () were absent.

Without these restrictions we still can (under specific conditions) derive a wave equation. The wave equation will now be non-homogeneous,i.e. The quantification and utilization of coupling effects in a prototypical structural acoustic system are examined in this paper.

In typical systems, the coupling mechanisms are manifested in two ways. The first leads to the transfer of energy from an ambient field to an adjacent structure and is often responsible for exogenous structural by: 3. The baffles distort the acoustic waves and On the effect of acoustic coupling on random and harmonic plate vibrations book increase the resistance of the tube bank to acoustic resonance and vibration.

The locations and number of baffles play an important role in the degree of their effectiveness in suppressing acoustic waves. The effects of the baffles raising the vibratory thresholds. A simple model problem is presented that accounts for the fluid-loading, i.e.

the coupling of the plate’s flexural vibrations and the acoustic field in the fluid. This model, consisting of a thin, transversely vibrating plate with a compressible fluid at one side and excited by a Author: C. Kauffmann. random vibration are indicated. The various steps involved in vibration analysis of an engineering system are outlined, and essential definitions and concepts of vibration are introduced.

The concept of harmonic motion and its representation using vectors and complex numbers is described. The basic definitions and terminology related to.

INSA Lyon, Laboratoire Vibrations-Acoustique (LVA), 25 bis, av. Jean Capelle, Villeurbanne, France @ PACS: Tb, Rj ABSTRACT The damping effect on the energy flow between an excited structure and a receiving acoustic cavity filled with a heavy fluid will be studied in this paper.

experimental results for free vibrations of a flexible panel-cavity system. Then, Pretlove,3 has examined the response of systems under the excitation of external random acoustic pressures.

Guy and Bhattacharya,4 have analysed theoretically and experimentally the coupling effect of a cavity-plate system on the sound transmission and.

Abdelkader Frendi has written: 'On the effect of acoustic coupling on random and harmonic plate vibrations' -- subject(s): Acoustical engineering 'An efficient model for coupling structural. Get this from a library. On the effect of acoustic coupling on random and harmonic plate vibrations.

[Abdelkader Frendi; J H Robinson; Langley Research Center.]. We find that for the linear plate response, acoustic coupling is negligible. However, for the nonlinear and chaotic responses, acoustic coupling has a significant effect on the vibration level as.

Fundamentals of Noise and Vibration is based on the first semester of the postgraduate Masters' course in Sound and Vibration Studies at the Institute of Sound and Vibration Research, at the University of Southampton. The main objective of the course is to provide students with the skills and knowledge required to practise in the field of noise and vibration control s do not Reviews: 1.

Nonlinear harmonic oscillation of a plate-cavity system is analytically studied in this paper. Von-Karman theory is used to model a rectangular plate backed by an air cavity.

Coupled nonlinear differential equations of system are analytically derived using Galerkin’s approach. The Multiple Scales Method (MSM) is then employed to solve the corresponding nonlinear by: The first edition of this book presented the principles of vibration and sound with only a little discussion of applications of these principles.

During the past eight years, our own experience, as well as that of other teachers who used it as a textbook, has indicated that students would benefit from more discussion of applications.

In this edition we have revised some of the mate rial in the 5/5(1). Tangential Effects on Magnetic Vibrations and Acoustic Noise of Induction Machines using Subdomain Method and Electromagnetic Vibration Synthesis Emile Devillers 1,2, Michel Hecquet 1, Jean Le Besnerais 2, Margaux Régniez 2 1L2EP; Université de Lille 1, Ecole Centrale de Lille, Villeneuve d’Ascq, France, [email protected] Size: 1MB.

Nonlinear vibration and radiation from a panel with transition to chaos. Modal interaction in chaotic vibrations of a shallow double-curved shell-panel. Journal of Sound and Vibration, Vol. No. Effect of acoustic coupling on random and harmonic plate by: The structural acoustic problem considered in this study is the nonlinear resonant frequencies of a rectangular tube with one open end, one flexible end, and four rigid side walls A multiacoustic single structural modal formulation is derived from two coupled partial differential equations which represent the large amplitude structural vibration of the flexible end and acoustic pressure Cited by: 4.

The plate was excited by a point force, and the piezoelectric element was bonded on its surface to suppress the plate vibration energy and internal acoustic energy that were amplified by mechanical-acoustic coupling.

Then it was shown that the damping technique using a resistor-inductor shunt circuit, Author: Hiroyuki Moriyama, Yuta Yamamura. Vibrations in musical instruments (1) SGN / A.K.

Vibrating string – Can be viewed as a mass-spring system: string mass and elasticity – Many vibration modes that are typically nearly exact integer multiples of a fundamental frequency " Harmonic modes (see bottom row of the figure on the previous slide) Size: 2MB.

THE PHYSICS OF VIBRATIONS AND WAVES Sixth Edition H. Pain Superposition of Two Perpendicular Simple Harmonic Vibrations 15 Polarization 17 Non-linear Effects in Acoustic Waves Shock Front Thickness Equations of Conservation Mach Number Emile Devillers1,2, Michel Hecquet 1, Jean Le Besnerais2, Margaux Régniez2 1L2EP (University of Lille 1), 2EOMYS ENGINEERING Tangential Effects on Magnetic Vibrations and Acoustic Noise of Induction Machines using Subdomain Method and Electromagnetic Vibration SynthesisFile Size: 8MB.

vertical plate in a cavity filled with a fluid is considered. We also consider the transient analysis of the plate with cantilever support in dry-condition to investigate the effect of considering numerical damping in the analysis.

The effects of time step and viscous damping were also studied in details. Some tangential magnetic force harmonics can directly create magnetic vibrations and acoustic noise when applied to the stator teeth: tangential forces create a bending moment of the stator teeth, resulting in radial vibrations of the yoke.

Besides tangential force harmonics. Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium word comes from Latin vibrationem ("shaking, brandishing").

The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road. Vibration can be desirable: for example, the motion of a tuning fork, the reed in a woodwind instrument or.

value of the coupling strength indicator (Cs) to those theoretically evaluated is observed. Frendi et al. [3] studied the problem of coupling between panel vibrations and near and far field acoustic radiation. Two models have been used to solve this structural - acoustic interaction problem.

Acoustic radiation by vortex induced flexible wall vibration The Journal of the Acoustical Society of America( “ Effect of acoustic coupling on random and harmonic plate vibrations,” AIAA J.

31, “ Responses of finite baffled plate to turbulent flow excitations,” AIAA J. 33, 13 Cited by: Harmonics. Any sound, not matter what the source, is caused by something vibrating.

Without vibration, there can be no sound. These vibrations cause the air particles next to the source to vibrate, and those air particles, in turn, cause the particles next to them to vibrate, and so on and so on, creating a sound like a wave in water, the farther out the sound wave moves, the weaker.

vi Acoustics, Aeroacoustics and Vibrations Measure on a σ-algebra 33 Convergence and integration of. Clamped rectangular plate coupled with a heavy fluid Location of resonances of a coupled plate Vibrations of a thin plate in a turbulent flow Interspectral density: simple models Green s representation of a coupled plate Aeroelastic coupling.

• Subject Area: Effect of Protuberances on Wall Pressure Fluctuations, The Boeing Company, SBIR Phase I: Development of High Order Schemes for Turbulence and Acoustic. The partitioned coupling method is implemented in the Sierra Mechanics software suite, allowing for the loose coupling of time domain acoustics in sierra/sd to structural dynamics (sierra/sd) or solid mechanics (sierra/sm).

The coupling is demonstrated to work for nonconforming : Gregory Bunting, Scott T. Miller. We find that for pdf linear plate response, pdf coupling is negligible.

However, for the nonlinear and chaotic responses, acoustic coupling has a significant effect on the vibration level as the loading increases. The radiated pressure from a plate undergoing nonlinear or chaotic vibrations is found to propagate nonlinearly into the Size: 1MB.Mechanical vibration is the term used to describe the continuing periodic motion of a solid body at any download pdf.

When the rate of vibration of the solid body ranges between 20 hertz (Hz), it may also be referred to as an acoustic vibration, for if these vibrations are transmitted to a human ear they will produce the sensation of sound.The transformation of vibrations into electric energy ebook the use of piezoelectric devices is an exciting and rapidly developing area of research with a widening range of applications constantly materialising.

With Piezoelectric Energy Harvesting, world-leading researchers provide a timely and comprehensive coverage of the electromechanical modelling and applications of piezoelectric.