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Monday, August 3, 2020 | History

3 edition of Utilization of coupling effects in compensator design for structural acoustic systems found in the catalog.

Utilization of coupling effects in compensator design for structural acoustic systems

H. T. Banks

Utilization of coupling effects in compensator design for structural acoustic systems

by H. T. Banks

  • 325 Want to read
  • 12 Currently reading

Published by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .
Written in English

    Subjects:
  • Feedback control.,
  • Acoustic attenuation.,
  • Acoustic coupling.,
  • Sound waves.,
  • Structural design criteria.,
  • Vibration isolators.

  • Edition Notes

    StatementH.T. Banks, M.A. Demetriou, R.C. Smith.
    SeriesICASE report -- no. 96-58., NASA contractor report -- 201608., NASA contractor report -- NASA CR-201608.
    ContributionsDemetriou, M. A., Smith, R. C., Institute for Computer Applications in Science and Engineering.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15487212M

    A device onto which a telephone handset is placed to connect a computer with a acoustic coupler might also contain a modem, or the modem could be a separate device.. Popular in the s, acoustic couplers are no longer widely used. Nowadays, telephones connect directly to a modem via modular telephone produces better connections than acoustic couplers and avoids. One of the key design parameters to a process plant with large capacity is the risk of AIV (Acoustically Induced Vibration) on the flare piping system. AIV is a piping vibration phenomenon exhibiting high frequencies caused by large acoustic power generated by the pressure drop across a File Size: 62KB.

    Structural ‐ Acoustics Tutorial Part 1 ‐ Fundamentals Dr. Stephen A. Hambric ASME IMECE Orlando, FloridaFile Size: 1MB. dards. Therefore, an acoustic analysis has to be included in the design process. The structural-dynamic and acoustic behaviour of anisotropic multilayered composite struc-tures can not be described by classical models. Here, advanced methods have been developed at the ILK, which take into account the special mechanical properties of the fibre-.

    2. FE Formulation of Structural Domain. A coupling system of acoustic-structure is shown in Figure 1. The structure is assumed to be fully submerged in interior and exterior acoustic fields or one of them. In Figure 1, the structure domain is denoted by. The interior and the exterior acoustic fields are denoted by and, by: 7. In my approach to root locus design, the purpose of compensator design using root locus methods generally is to establish a specified point in the s-plane, s= s1, as a closed-loop pole. The assumption is that time-domain transient specifications, such as settling time and overshoot, will be satisfied if s1 is a dominant closed-loop pole.


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Utilization of coupling effects in compensator design for structural acoustic systems by H. T. Banks Download PDF EPUB FB2

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. Utilization of coupling effects in compensator design for structural acoustic systems H.

Banks Center for Research in Scientific Computation, North Carolina State University, Raleigh, North Carolina M. Demetriou Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts R. Smith. 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.

Get this from a library. Utilization of coupling effects in compensator design for structural acoustic systems. [H T Banks; M A Demetriou; R C Smith; Institute for Computer Applications in. damage detection as inverse problems for distributed parameter systems: computational approaches h.t.

banks, r.c. smith, and y. zhang april, crsc-tr utilization of coupling effects in compensator design for structural acoustic systems - numerical examples h.t. Coupling and Simulation of Acoustic Fluid-Structure Interaction Systems Using Localized Lagrange Multipliers by Mike R.

Ross B.S., Colorado School of Mines, M.S., University of Colorado, Boulder, A thesis submitted to the Faculty of the Graduate School of the University of Colorado in partial fulfillment of the requirements for the. degree of freedom (dof) radiating structural system coupled to a multiple dof acoustic system.

As a rst consequence of this structural-acoustic coupling, the eigenfrequencies and damping factors are modi ed, compared to the \in vacuo" case. Probably even more signi cant is the. structural-acoustic analysis. The internal sound field in the enclosed cavity is significantly affected by the acoustic modal characteristics of the cavity, by the dynamic behavior of the surrounding structure, and by the nature of the coupling of these two dynamic systems.

The present work is intended to cast more. matrix coupling. 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 domain. Consequently,File Size: KB. For purely structural systems, dynamic substructuring techniques are well established.

Here, one such technique is adapted to solve the coupled response of elastic structures in contact with acoustic : R. Benjamin Davis, Ryan Schultz. efficiency of transport systems. Designers often use a finite element calculation of the coupled system to predict the sound levels found in the acoustic cavity.

A finite element model involving structural and acoustic elements is formulated, with coupling between the structural and pressure degrees of freedom,Cited by: 2. Computational methods within structural acoustics, vibration and fluid-structure interaction are powerful tools for investigating acoustic and structural-acoustic problems in many sectors of industry; in the building industry regarding room acoustics, in the car industry and aeronautical industry for optimizing structural components with regard to vibrations characteristics etc.

Combustion instability is often encountered in various power systems, a good understanding on the sound field in acoustic cavity as well as its coupling with boundary flexible structure will be of great help for the reliability design of such combustion system.

An improved Fourier series method is presented for the acoustic/vibro-acoustic modelling of acoustic cavity as well as the panel Author: Jingtao Du, Yang Liu, Long Liu. Modal cross-couplings are sometimes neglected in the prediction of sound field and structural responses of vibroacoustic systems where an enclosed sound field is coupled to a vibrating boundary structure.

In such systems, there are two types of modal cross-couplings and they are commonly referred to as acoustic modal cross-coupling (ACC) and structural modal cross-coupling Cited by: 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. Acoustic-structure interaction involves the coupling of physics from two different fields: acoustics and structural mechanics.

In some applications, both the acoustic pressure waves in the fluid and the vibrations of the solid are strong enough to affect each other significantly, resulting in.

COMBINATION METHODS FOR DERIVING STRUCTURAL DESIGN LOADS CONSIDERING VIBRO-ACOUSTIC, ETC., RESPONSES Method 3: Coupled Transient Analysis with Modal MAC It is generally accepted that base drive random analysis can be very conservative, because it does not account for impedance Size: 40KB.

The effect of structural-acoustic coupling on the active co ntrol of noise in vehicles Jordan Cheer 1, Stephen J. Elliott 1 1 Institute of Sound and Vibration Research, University of So uthampton,SouthamptonSO17 1BJ, United Kingdom email: @,[email protected] This paper discusses the acoustic-structural coupling analysis of muffler in which the method of the finite element is used to solve the differential equations.

Firstly, according to the symmetry of muffler, by using coordinate transformation the sound field problem is converted from three-dimensional to two-dimensional problem. Secondly, by using Galerkin method derives finite element Cited by: 1.

The applications of sandwich structures in industry are numerous. The optimization of such structures with high strength and light weight have been the topic of interest for many researchers. There have also been a few studies on the vibration and sound transmission across these structures.

This dissertation presents the structural and acoustic studies of sandwich structures for transport Author: Qi Chen.

structural domain and/or a porous sound absorbing material domain. The (crashworthiness), so the design processmust be conducted in an integrated fashion that addresses various vehicle properties { such as safety, reliability and comfort { in the process.

when solving structure-acoustic systems is likely to become very large. The.The main objective is to analyse the effects of the imposition of common velocity on the acoustic–structural interface via the Component Mode Synthesis Method (CMS). The original contribution of this analytical study is to show the importance of including kinematic compatibility on the structural-acoustic by: To facilitate the acoustic–structural–acoustic coupled analysis, the mesh of the FE model was slightly modified in this study.

The TM was meshed by six-noded pentahedral elements instead of shell elements because the coupled analysis between the air in the ear canal, structures of the TM and ossicles, and the air in the middle ear Cited by: