View in EDS

Structural FE model updating of cavity systems incorporating vibro-acoustic coupling.

Saved in:
Bibliographic Details
Title: Structural FE model updating of cavity systems incorporating vibro-acoustic coupling.
Authors: Nehete, D. V.1, Modak, S. V.1 svmodak@mech.iitd.ac.in, Gupta, K.1
Source: Mechanical Systems & Signal Processing. Jan2015, Vol. 50/51, p362-379. 18p.
Subjects: Acoustic couplers, Structural frame models, Finite element method, Dynamic testing, Sound pressure
Abstract: Finite element model updating techniques are used to update the finite element model of a structure in order to improve its correlation with the experimental dynamic test data. These techniques are well developed and extensively studied for the case of purely structural dynamic systems. However, the cavities encountered in automotive, aerospace and other transportation applications represent a class of structures in which an elastic structure encloses an acoustic medium. In such systems the dynamic characteristics of the structure are influenced by the acoustic loading due to the acoustic response in the cavity. The existing structural FE model updating approaches assume the structure to be under in-vacuo condition and hence if used for updating cavity structural FE models would not allow taking into account the effect of acoustic loading on the structural dynamic characteristics. This may adversely affect the effectiveness of updating in yielding an accurate updated FE model. This paper addresses the above issue and presents a structural FE model updating method, called 'coupled inverse eigen-sensitivity method', which takes into account the acoustic loading on the structure. The method uses the experimentally identified coupled modal data on the structure as the reference data. A numerical case study of a 3D rectangular cavity backed by a flexible plate is presented to evaluate the effectiveness of the approach to obtain an accurate structural FE model. Updating is also carried out using the existing (uncoupled) inverse eigen-sensitivity method to study the influence of acoustic loading on the updating process and to study the accuracy with which the updating parameters are identified. The results obtained are also compared with those obtained by the proposed coupled inverse eigen-sensitivity method. [ABSTRACT FROM AUTHOR]
Copyright of Mechanical Systems & Signal Processing is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 97386813
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Structural FE model updating of cavity systems incorporating vibro-acoustic coupling.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Nehete%2C+D%2E+V%2E%22">Nehete, D. V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Modak%2C+S%2E+V%2E%22">Modak, S. V.</searchLink><relatesTo>1</relatesTo><i> svmodak@mech.iitd.ac.in</i><br /><searchLink fieldCode="AR" term="%22Gupta%2C+K%2E%22">Gupta, K.</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Mechanical+Systems+%26+Signal+Processing%22">Mechanical Systems & Signal Processing</searchLink>. Jan2015, Vol. 50/51, p362-379. 18p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Acoustic+couplers%22">Acoustic couplers</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+frame+models%22">Structural frame models</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamic+testing%22">Dynamic testing</searchLink><br /><searchLink fieldCode="DE" term="%22Sound+pressure%22">Sound pressure</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Finite element model updating techniques are used to update the finite element model of a structure in order to improve its correlation with the experimental dynamic test data. These techniques are well developed and extensively studied for the case of purely structural dynamic systems. However, the cavities encountered in automotive, aerospace and other transportation applications represent a class of structures in which an elastic structure encloses an acoustic medium. In such systems the dynamic characteristics of the structure are influenced by the acoustic loading due to the acoustic response in the cavity. The existing structural FE model updating approaches assume the structure to be under in-vacuo condition and hence if used for updating cavity structural FE models would not allow taking into account the effect of acoustic loading on the structural dynamic characteristics. This may adversely affect the effectiveness of updating in yielding an accurate updated FE model. This paper addresses the above issue and presents a structural FE model updating method, called 'coupled inverse eigen-sensitivity method', which takes into account the acoustic loading on the structure. The method uses the experimentally identified coupled modal data on the structure as the reference data. A numerical case study of a 3D rectangular cavity backed by a flexible plate is presented to evaluate the effectiveness of the approach to obtain an accurate structural FE model. Updating is also carried out using the existing (uncoupled) inverse eigen-sensitivity method to study the influence of acoustic loading on the updating process and to study the accuracy with which the updating parameters are identified. The results obtained are also compared with those obtained by the proposed coupled inverse eigen-sensitivity method. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Mechanical Systems & Signal Processing is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=97386813
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ymssp.2014.05.028
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 362
    Subjects:
      – SubjectFull: Acoustic couplers
        Type: general
      – SubjectFull: Structural frame models
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Dynamic testing
        Type: general
      – SubjectFull: Sound pressure
        Type: general
    Titles:
      – TitleFull: Structural FE model updating of cavity systems incorporating vibro-acoustic coupling.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Nehete, D. V.
      – PersonEntity:
          Name:
            NameFull: Modak, S. V.
      – PersonEntity:
          Name:
            NameFull: Gupta, K.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 01
              Text: Jan2015
              Type: published
              Y: 2015
          Identifiers:
            – Type: issn-print
              Value: 08883270
          Numbering:
            – Type: volume
              Value: 50/51
          Titles:
            – TitleFull: Mechanical Systems & Signal Processing
              Type: main
ResultId 1