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Multi-objective vibro-acoustic optimization of stiffened panels

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Abstract

A multi-objective vibro-acoustic design optimization of straight or curvilinearly stiffened panels excited by an acoustic diffuse field is performed. During design optimization, the panel mass and the radiated acoustic power are the two objectives to be minimized while satisfying constraints on buckling, von Mises stress and crippling. Based on the concept of plane wave propagation, a diffuse acoustic field is developed for use along with a finite element model. To represent the panel’s structural behavior, the dynamic analysis of the panel is performed for the developed diffuse acoustic excitation and the radiated acoustic power is calculated using the velocities obtained from the dynamic analysis. A baseline design is obtained by optimization study with mass as an objective to be minimized while constraints are put on buckling, von Mises stress and crippling. The obtained baseline grid stiffened panel is used for a comparative study of a panel with curvilinear stiffeners in vibro-acoustics with diffuse sound field as the source of the excitation.

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Acknowledgments

The work presented here is funded under NASA Subsonic Fixed Wing Hybrid Body Technologies NRA (NASA NN L08AA02C) with Ms. Karen Taminger as the Program Manager (PM) and Mr. Keith Bird as Contracting Officer’s Technical Representative (COTR). We are thankful to both Ms. Taminger and Mr. Bird for their suggestions. The authors would like to thank Mr. Dan Palumbo and the E B F3 team at NASA Langley Research Center for technical discussions. The authors would also like to thank our partners in the NRA project, Mr. Bob Olliffe, Mr. David Havens and Dr. Steve Englestadt all of Lockheed Martin Aeronautics Company of Marietta, GA, for technical discussions.

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Author notes

  1. Pankaj Joshi

    Present address: Heinkel Engineering GmbH Co. KG, Hamburg, Germany

Authors and Affiliations

  1. Virginia Polytechnic Institute and State University, Blacksburg, VA, 24060, USA

    Pankaj Joshi

  2. Department of Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, 460 Old Turner St., Blacksburg, VA, 24060, USA

    Sameer B. Mulani

  3. Department of Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24060, USA

    Rakesh K. Kapania

  4. Department of Aerospace Engineering and Mechanics, University of Alabama, Tuscaloosa, AL, 35487, USA

    Sameer B. Mulani

Authors
  1. Pankaj Joshi
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  2. Sameer B. Mulani
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  3. Rakesh K. Kapania
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Corresponding author

Correspondence to Pankaj Joshi.

Additional information

Pankaj Joshi is a Former Graduate Research Assistant, Department of Aerospace and Ocean Engineering; Currently Acoustic Engineer at Heinkel Engineering GmbH Co. KG (Airbus subcontractor for cabin acoustics in Germany).

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Joshi, P., Mulani, S.B. & Kapania, R.K. Multi-objective vibro-acoustic optimization of stiffened panels. Struct Multidisc Optim 51, 835–848 (2015). https://doi.org/10.1007/s00158-014-1177-9

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  • DOI: https://doi.org/10.1007/s00158-014-1177-9

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