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2 edition of Finite element acoustic analysis of absorption silencers with mean flow found in the catalog.

Finite element acoustic analysis of absorption silencers with mean flow

Keshav Lal Rathi

Finite element acoustic analysis of absorption silencers with mean flow

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Published .
Written in English


Edition Notes

Thesis (Ph.D.) - Loughborough University of Technology, 1994.

Statementby Keshav Lal Rathi.
ID Numbers
Open LibraryOL19694971M

MultiD linear codes, based on the finite element method (FEM) or boundary element method (BEM) [17–19], are commonly used for acoustic simulations. Nonlinear 3D approaches have also been exploited by some authors showing good potentialities for the prediction of silencer attenuation characteristics with and without mean Cited by: 9. Bemhard, Robert James ACOUSTIC FINITE ELEMENT ANALYSIS OF DUCT BOUNDARIES lov/a State University PH.D. University microfilms International N. zeeb Rœa, Ann Arbor, MI . Finite Element Analysis does not suffer from such limitations and has therefore been used to analyse the design of a reactive silencer for the exhaust stack of a MW power station. To assist in the design .


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Finite element acoustic analysis of absorption silencers with mean flow by Keshav Lal Rathi Download PDF EPUB FB2

The acoustic Finite element acoustic analysis of absorption silencers with mean flow book is one of the method which help to analyse the sound level at the tail pipe. This seminar revises acoustic analysis of muffler using Finite Element : Rupesh Gosavi. A cognitive journey towards the reliable simulation of scattering problems using finite element methods, with the pre-asymptotic analysis of Galerkin FEM for the Helmholtz equation with moderate and large wave number forming the core of this by: A mixed finite element model has been derived for the acoustic analysis of perforated dissipative silencers including severaleffects Finite element acoustic analysis of absorption silencers with mean flow book (1) High temperature and thermalgradients in the central and the ductouter absorbent material; (2) A perforated carrying passage non-uniform axial mean.

the performance of reactive silencers are - limited to conditions where the dimensions of the duct and resonators are small compared to the wavelength of the sound.

Finite Element Analysis does not. A finite element approach is proposed for the acoustic analysis of automotive silencers including a perforated duct with uniform axial mean flow and an outer chamber with heterogeneous absorbent.

A numerical technique is developed for the analysis of dissipative silencers of arbitrary, but axially uniform, cross section. Mean gas flow is included in a central airway that is separated from a bulk Cited by: A general finite element formulation for the analysis of the sound field in a flow duct with a surrounding volume filled with porous or fibrous absorbent material is given.

The detailed, Finite element acoustic analysis of absorption silencers with mean flow book, steady flow field which is induced in the absorbent by the high speed mean Cited by: A finite element approach for the acoustic modeling of perforated dissipative mufflers with non-homogeneous properties.

the heterogeneity was associated with the mean flow induced in the Cited by: A sound field of measurement for the absorption coefficient in reverberation room is assumed to be diffuse sound field.

Then, the measurement sound field is analyzed by TDFEM, and the incident. 5 If c is the speed of sound propagation in the fluid and is the angular frequency, then k is the wave number defined as k= /ipts Re and Im denote the real part and the imaginary part of a.

finite elements analysis of both inductive and resistive damping in pressure acoustics. Key-Words: FEM, reactive muffler, absorptive muffler, transmission loss, glass wool 1 Introduction In this paper, we will File Size: 1MB. Abstract. Finite element techniques were first developed for analysing complex, engineering structures.

Once the method had been given a firm mathematical foundation, it was only natural that it should be Cited by:   Synthesis Criteria for Low-Pass Acoustic Filters References 3 Flow-Acoustic Analysis of Cascaded-Element Mufflers The Exhaust Process Finite Amplitude Wave Effects Mean Author: M.

Munjal. Transmission loss (TL) is often used to evaluate the acoustic attenuation performance of a silencer. In this work, a three-dimensional (3D) finite element method (FEM) is employed to calculate the TL of some representative silencers, namely, circular expansion chamber silencer and straight-through perforated pipe silencer.

In order to account for the effect of mean Cited by: 3. 3 THE FINITE ELEMENT METHOD Two dimensional nite element models using the software package Ansys (c Ansys Inc.) were used to predict the TL of resonators of various dimensions.

The models. An Investigation of Acoustic Attenuation Performance of Silencers with Mean Flow Based on Three-Dimensional Numerical Simulation WeiFanandLi-XinGuo School of Mechanical Engineering and.

Exhaust stack silencer design using finite element analysis The work presented here is a Finite Element based numerical and experimental investi- The finite element analysis of the Cited by:   Archives for Acoustic analysis Designing Quieter Products With Computer Aided Engineering In today’s marketplace companies are using simulation technology more and more in.

A three-dimensional finite element method has been implemented to predict the transmission loss of a packed muffler and a parallel baffle silencer for a given frequency range.

Iso-parametric quadratic Cited by: Finite Element Analysis of Acoustic Scattering With 88 Illustrations 1 The Governing Equations of Time-Harmonic Wave Propagation, 1 Acoustic Waves 1 Linearized Equations for.

Synthesis Criteria for Low-Pass Acoustic Filters References 3 Flow-Acoustic Analysis of Cascaded-Element Mufflers The Exhaust Process Finite Amplitude Wave Effects Mean Price: $ Finite Element Analysis of Acoustic Scattering. Editors (view affiliations) Frank Ihlenburg; Part of the Applied Mathematical Sciences book series (AMS, volume ) Log in to check access.

Buy eBook. * Fully updated second edition of the premier reference book on muffler and lined duct acoustical performance, in one complete volume * Presents original new research on topics including baffle.

Aiming to obtain the acoustic attenuation performance of exhaust muffler of diesel engine and the influence of main structural parameters on its acoustic attenuation characteristics, the finite Author: Jun Fu, Minghui Xu, Zengfeng Zhang, Wenjie Kang, Yong He. frequency [12].

In the finite element method the entire three-dimensional domain has to be discretized and modeled with volume elements. Acoustic analysis in ANSYS can be solved by performing File Size: KB. Finite Element Analysis on Loudspeaker. 16th October This article serve to introduce Finite Element Method to the general public and demonstrate the amount of consideration required when.

In the present study, the finite element method (FEM) is used to predict the acoustic attenuation performance, and the finite volume method (FVM) is employed to calculate the flow resistance of.

The analysis of aeroacoustics propagation is required to solve many practical problems. As an alternative to Euler’s linearized equations, an equation was established by Galbrun in It assumes the flow Cited by: Download Limit Exceeded You have exceeded your daily download allowance.

FLOW CONSIDERATIONS IN INDUSTRIAL SILENCER DESIGN George Feng, Kinetics Noise Control, Inc., Nashua Drive, Mississauga, Ontario Vadim Akishin, Kinetics Noise Control, Inc., File Size: KB.

Get this from a library. Acoustics of ducts and mufflers. [M L Munjal] -- "Fully updated second edition of the premier reference book on muffler and lined duct acoustical performanceEngine exhaust noise. used to compute acoustic source terms directly on the fine fluid grid. As a second step, after conservative interpolation of the acoustic nodal sources to the acoustic grid, the acoustic propagation.

Detailed finite element analysis, where an initial study has already been conducted or a problem has been identified. This can either predict piping stress levels or, if field data is available, accurately.

fluid flow, a thermal and a mechanical finite element computation, as well as a final fatigue analysis. The CAE software has intuitive graphical interface with direct access to CAD geometry, advanced.

torp, Structure-acoustic analysis in an integrated modelling environment, WCCMVcongressinVienna, Paper6 PeterDavidsson,JonasBrunskog,Per. First, the finite element method is employed in a two-dimensional problem to extract the eigenvalues and associated eigenvectors for the silencer cross section.

Mean flow as well as radial temperature. A hybrid method is developed by combining energy finite element method (EFEM) and energy boundary element method (EBEM) to predict interior noise of structural-acoustic systems at Cited by: 1.

[5] Acoustics of Ducts and silencers by [6] V.P. Patekar and R.B. Patil Vibration Analysis of Automotive Exhaust Silencer Based on FEM and FFT Analyzer. ISSN No. (Print): [7]. An alternative is to use the finite element method to obtain numerically each constant (Craggs, ).

Fortunately, a large number of transfer matrices have been theoretically developed and reported in the literature. Some of them include the convective effects of a mean. Fully updated second edition of the premier reference book on muffler and lined duct acoustical performance, in one complete volume Presents original new research on topics including baffle.

pdf measures. Parallel baffle silencers are often used in ducts and exhausts, which can contain hot and eroding gases, requiring exotic materials to withstand such conditions.

Attenuation for these .Topics: Acoustics, Finite element methods, Mode shapes, Resonance, Finite element analysis, Fluids, Boundary-value problems, Damping, Radiation (Physics), Space An Equivalent-Acoustic Finite .analysis, two pieces of information are usually required the amplitude ebook the forcing frequency [12].

In the finite element method the entire three-dimensional domain has to be discretized and modeled with .