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Saturday, April 18, 2020 | History

3 edition of Coupling between plate vibration and acoustic radiation found in the catalog.

Coupling between plate vibration and acoustic radiation

Coupling between plate vibration and acoustic radiation

  • 278 Want to read
  • 39 Currently reading

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

    Subjects:
  • Acoustic radiation pressure.,
  • Vibration.

  • Edition Notes

    StatementAbdelkader Frendi, Lucio Maestrello, Alvin Bayliss.
    SeriesNASA contractor report -- 189741., ICASE report -- no. 92-67., NASA contractor report -- NASA CR-189741., ICASE report -- no. 92-67.
    ContributionsMaestrello, Lucio., Bayliss, Alvin., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14693193M

      On the Use of the Wave Based Technique for a Three-Dimensional Noise Radiation Analysis of Coupled Vibro-Acoustic Problems Driven by both the ever more restrictive legal regulations on human exposure to noise and the growing customers' expectations regarding the functional performance of a product, the vibro-acoustic behaviour of Author: Jan Rejlek, Hans H. Priebsch. Examples of this include coupling acoustics and CFD to model acoustic streaming or the nonlinear effects of vortex shedding generated by acoustic waves. As an added benefit, by using an equation-based modeling approach and eliminating the need for fundamental coding, you can greatly increase the flexibility in what you can model and reduce the. Efficiency of Sound Radiation from Vibrating Bodies I. VIBRATION EFFICIENCY Sound waves are primarily created by the vibration of physical bodies in contact with the air. The motion of the body causes the air in the immediate vicinity of the body to also move. The question I will address here is how much of that motion of the air in theFile Size: KB. In this paper, the current state of the art on shunt piezoelectric systems for noise and vibration control is reviewed. The core idea behind the operation of electronic shunt piezoelectric circuits is based on their capability of transforming the dynamic strain energy of the host structure, i.e., a smart beam or plate, into electric energy, using the properties of the direct piezoelectric Cited by: 3.

      Depending on the frequency, the sound intensity is more or less 30 dB near the plate (measured at 1cm of distance). Does someone have any idea of the typical vibration amplitude of a plate radiating sound? And of the relationship between the vibration amplitude of a plate and the acoustic power radiated? Thanks a lot!


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Coupling between plate vibration and acoustic radiation Download PDF EPUB FB2

A detailed numerical investigation of the coupling between the vibration of a flexible plate and the ensuing acoustic radiation is described.

The non-linear Euler equations are used to describe the acoustic fluid, while the non-linear yon Kármán plate equations are Cited by: COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are Coupling between plate vibration and acoustic radiation book from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

Sound and Structural Vibration Radiation, Transmission and Response. Book • 2nd Edition • Acoustic Coupling between Structures and Enclosed Volumes of Fluid.

The first edition of Sound and Structural Vibration was written in the early s. Since then, two major developments have taken place in the field of vibroacoustics. Request PDF | Vibration and Sound Radiation | In this chapter, we discuss the general structural–acoustic problem.

Before we begin to investigate the active control of structural–acoustic. The physical process of vibrational interaction between fluids and solid structures, and models and analyses of the behavior of coupled fluid-structure systems are described.

The temporal and spatial distributions of wave field variables, the characteristics of waves in beam, plate, and shell structures, the dispersion relationships between wave speed and frequency forms, the natural Author: F.

Fahy. Acoustic radiation by vortex induced flexible wall vibration Article (PDF Available) in The Journal of the Acoustical Society of Coupling between plate vibration and acoustic radiation book Vol.

(4) October with Reads. On the Combined Effect of Mean Flow and Acoustic Excitation on Structural Response and Radiation and Maestrello, L. (July 1, ). "On the Combined Effect of Mean Flow and Acoustic Excitation on Structural Response and Radiation." ASME.

Vib. Coupling between plate vibration and acoustic radiation book. July ; (3): – Coupling Between Plate Vibration and Acoustic Cited by: 5. The sound radiation from elastically restrained plates covered by a decoupling layer is studied using the Spectrogeometric Method (SGM), which is a meshless and parametric modeling technique.

By adopting the Rayleigh-Ritz procedure and the Rayleigh integral, a vibroacoustic coupling system is established. This model studies the situation when the plate is immersed in Cited by: 2.

Acoustic radiation of low frequency °exural vibration modes in a submerged plate D. Decultot a, R. Lietard a, F. Chati a, G. Maze b and A. Klauson c a LOMC FRE CNRS Groupes Ondes Acoustiques, Universitedu Havre (IUT), Place Robert Schuman, Le Havre, France b LAUE, Universitedu Havre, Place Robert Schuman, F Le Havre, France c Tallinn.

The first edition of Sound and Structural Vibration was Coupling between plate vibration and acoustic radiation book in the early then, two major developments have taken place in the field of vibroacoustics.

Powerful computational methods and procedures for the numerical analysis of structural vibration, acoustical fields and acoustical interactions between fluids and structures have been Book Edition: 2.

energy occurs not only between vibration systems but also between vibration and acoustic systems; this latter phenome-non is known as vibroacoustic coupling. If a thin Coupling between plate vibration and acoustic radiation book that encloses a space is excited by an external periodic force, vibroacoustic coupling readily occurs between the structural vibrations and the internal sound field.

simulating sound radiation. Their elasto-acoustic and hydro-elastic capabilities, however, are very helpful in solving FSI vibration problems by providing straightforward fluid– structural coupling in a given range of vibration analyses in which: • The fluid is quiescent or at least moderately slow.

• Vibration amplitudes are small File Size: KB. neighboring vibration modes in the lower frequency range, so Coupling between plate vibration and acoustic radiation book vibroacoustic coupling was considered as phenomena based on a pair of the vibration and acoustic modes3,4.

The accumulation number of the acoustic modes exceeds greatly that of the vibration modes in the higher frequency range, increasing remarkably with. This book presents a unified qualitative and quantitative account of the physical mechanisms and characteristics of linear interaction between audio-frequency vibrational motion in compressible fluids and structures with which they are in contact.

The primary purpose is to instruct the reader in theoretical approaches to the modelling and analysis of interactions, whilst simultaneously. Sound radiation from plate-like structures has been extensively studied, in particular for the case of a plate mounted in an infinite rigid baffle.

Maidanik (1) first proposed a model for the radiation efficiency of a baffled plate assuming broadband excitation and multi-mode response.

Wallace (2) employed the Rayleigh integral to. simulating sound radiation. Their elasto-acoustic and hydro-elastic capabilities, however, are very helpful in solving FSI vibration problems by providing straightforward fluid– structural coupling in a given range of vibration analyses in which: • The fluid is quiescent or at least moderately slow • Vibration amplitudes are small (linear.

Currently, researches on the acoustic radiation efficiency and sound insulation performance of the micro-perforated plate mainly focused on the experimental test, and the numerical simulation is rarely reported.

In this paper, firstly, the discrete element method was applied to test the acoustic radiation efficiency of the micro-perforated : Yang Li, Chen Guo. vibration data the sound pressure at each node can be calculated.

Radiation E–ciency A useful measure of the efiectiveness of sound radiation by a vibrating surface is the total radiated sound power normalized with respect to the speciflc acoustic impedance of the °uid medium, the structure area and the velocity of the surface File Size: 2MB.

An Introduction to Acoustics S.W. Rienstra & A. Hirschberg Eindhoven University of Technology 28 Nov This is an extended and revised edition of IWDE Comments and corrections are gratefully accepted. This file may be used and printed, but for personal or educational purposes only. c S.W. Rienstra & A.

Hirschberg Journal of Sound and Vibration "# "2#\ A RADIATION EFFICIENCY FOR UNBAFFLED PLATES WITH EXPERIMENTAL VALIDATION C[ H[ OPPENHEIMER$ AND S[ DUBOWSKY Department of Mechanical Engineering\ M[I[T[\ Cambridge\ MA \ U[S[A[ "Received 6 July \ and in _nal form 0 July # A radiation ef_ciency is developed for.

Results are presented for the control of plate vibration with constant and varying frequencies of excitation and for the control of acoustic radiation with constant frequency excitation. PACS numbers: Dx, Vn INTRODUCTION Recent approaches to controlling structural vibration and radiation at low frequencies, where conventional passive.

A finite difference method is developed to study, on a two-dimensional model, the acoustic pressure radiated when a thin elastic plate, clamped at its boundaries, is excited by a turbulent boundary layer.

Consider a homogeneous thin elastic plate clamped at its boundaries and extended to infinity by a plane, perfectly rigid, baffle. This plate closes a rectangular by: 7. ELECTRICITY GENERATION USING VIBROACOUSTIC COUPLING BETWEEN END PLATE VIBRATIONS AND INTERNAL SOUND FIELD OF CYLINDRICAL STRUCTURE Prof.

Moriyama H.1, Kojima A.2, and Prof. Oshinoya Y.1 Department of Prime Mover Engineering, Tokai University, Japan 1 Course of Science and Technology, Graduate School. The first edition of Sound and Structural Vibration was written in the early s. Since then, two major developments have taken place in the field of vibroacoustics.

Powerful computational methods and procedures for the numerical analysis of structural vibration, acoustical fields and acoustical interactions between fluids and structures have been Reviews: 2.

Plate 1. Vibrating beam suspended in air is damped by radiation up strings, acoustic radiation and internal damping within bar. Plate 2. Strobe sequence of fluttering tube, eight flashes during half a cycle. Arrow marks end of tube. From I34]. (facing p. Sound and Structural Vibration: Radiation, Transmission and Response, 2nd Edition Presenting the foundations of modern numerical analysis, this book is illustrated by examples that have been chosen to complement the analytical approaches to solving simple problems of sound radiation, transmission and fluid-structural coupling.

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 time-harmonic load, is analyzed in some : C.

Kauffmann. Low-noise, energy-saving and improved sound quality has been the major concern for the eco-design of household appliance product. In this paper, taking off from vibro-acoustic coupling, a composite noise control scheme (CNCS) combined with dynamic vibration absorbing technology, the sound absorption technique, controlling noise in the outlet, and particle damping technique Author: Chengjun Wu, Xiaofei Lei.

Because of their many vibratory resonances, plates are mechanically soft and their suspending structures have considerable effect on their vibration and sound radiation.

Experimental evaluation of acoustic properties of plates is therefore difficult. Plates of different shapes and dimensions were supported in such a way as to eliminate the effects of the Author: Robert J. Hannon. This paper was based on a theoretical framework to determine strong and weak radiation by a guitar top plate, vibrating through deflections hard to analyze: multipolar mode shapes.

The air–structure interaction was examined in terms of edge modes or corner modes, and considering even or odd number modes. A numerical model was implemented and Cited by: 5. Vibration of structures due to external sound is one of the main causes of interior noise in cavities like automobile, aircraft, and rotorcraft, which disturb the comfort of passengers.

Accurate modelling of such phenomena is required in eigenfrequency analysis and in designing an active noise control system to reduce the interior noise. In this paper, the effect of periodic noise Cited by: polymers, plastics to reduce vibration and noise.

In this study, vibration and acoustic analysis of laminated composite plate are carried out experimentally. Carbon fibre reinforced polymer and glass fibre reinforced polymer plates are used to study low frequency vibration and their effect of surrounding air medium.

Get this from a library. Sound and Structural Vibration: Radiation, Transmission and Response. [Frank J Fahy] -- This book presents a unified qualitative and quantitative account of the physical mechanisms and characteristics of linear interaction between audio-frequency vibrational motion in compressible.

Sound Radiation by Flexural Waves in Plates. Before proceeding to the question of frequency distributions of natural frequencies of plates and thereby to their frequency-average resonant radiation characteristics, we pause to reconsider radiation. 1 The effect of different combinations of boundary conditions on the average radiation efficiency of rectangular plates G.

aSquicciarini, D. Thompsona, R. Corradib a Institute of Sound and Vibration Research, University of Southampton Southampton, SO17 1BJ, UKFile Size: KB. Response of a Baffled Plate to Plane Waves Applications of the Principle of Reciprocity Modal Reciprocity: Radiation and Response Radiation Due to Point Forces and Response to Point Sources Applications of Response Theory Problems 6.

Acoustic Coupling between Structures and Enclosed Volumes of Fluid. The animations below illustrate the sound radiation from flexural Bending waves traveling in the +x direction (to the right) on an infinite thin plate. The plate wave motion is shown as the thick black wave pattern at the bottom of each animation.

The particles in the fluid medium above the plate oscillate in response to this plate motion. Statistical energy analysis (SEA) is a method for predicting the transmission of sound and vibration through complex structural acoustic systems. The method is particularly well suited for quick system level response predictions at the early design stage of a product, and for predicting responses at higher frequencies.

Sound Radiation from an Elastically Restrained Plate uid from the vibration ofthebasestructure. Sound radiation from plates in a heavy uid has been Rayleigh integral, the strong coupling between the structure and acoustic space is considered.

Classic and elastically. Study on acoustic radiation impedance at aperture of a reduced by calculating the integral with only once coupling as in the Rayleigh calculation and Self- radiation impedance for several vibration modes (left: radiation resistance, right: radiation reactance).Author: Kyong-Su Won, Myong-Jin Kim, Song-Jin Im.

pdf Experimental Analysis of Acoustic Coupling Vibration of Pdf and Suspension Vibration on Tire Cavity Resonance It is difficult to improve tire cavity noise since the pressure of cavity resonance acts as a compelling force, and its low damping and high gain characteristics dominate the vibration of both the suspension and by: 6.In this paper, the natural frequencies and acoustic radiation mode amplitudes of laminated composite plates are studied.

The layerwise finite element model is imposed to determine the natural frequencies and velocity distri-butions of laminated composite plates. The amplitude of the laminated composite plates are then discussed based.there will be coupling of the speak era ebook the mediu.' The literat,1re is almost entirely void of information concerning this coupling effect.

It is the purpose of this thesis to in-vestigate the mut al coupling between identical loudspeakers anj to .