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Calculation of Coupled Vibroacoustics Response Estimates from a Library of Available Uncoupled Transfer Function Sets
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Author and Affiliation:
Smith, Andrew(NASA Marshall Space Flight Center, Huntsville, AL, United States);
LaVerde, Bruce(Engineering Research and Consulting, Inc., Structural Dynamics and Loads, Huntsville, AL, United States);
Hunt, Ron(Triumph Aerospace Systems, Structural Dynamics and Loads, Huntsville, AL, United States);
Fulcher, Clay(Jacobs Engineering Group, Inc., Structural Dynamics and Loads, Huntsville, AL, United States);
Towner, Robert(Jacobs Engineering Group, Inc., Structural Dynamics and Loads, Huntsville, AL, United States);
McDonald, Emmett(Jacobs Engineering Group, Inc., Structural Dynamics and Loads, Huntsville, AL, United States)
Abstract: The design and theoretical basis of a new database tool that quickly generates vibroacoustic response estimates using a library of transfer functions (TFs) is discussed. During the early stages of a launch vehicle development program, these response estimates can be used to provide vibration environment specification to hardware vendors. The tool accesses TFs from a database, combines the TFs, and multiplies these by input excitations to estimate vibration responses. The database is populated with two sets of uncoupled TFs; the first set representing vibration response of a bare panel, designated as H(sup s), and the second set representing the response of the free-free component equipment by itself, designated as H(sup c). For a particular configuration undergoing analysis, the appropriate H(sup s) and H(sup c) are selected and coupled to generate an integrated TF, designated as H(sup s +c). This integrated TF is then used with the appropriate input excitations to estimate vibration responses. This simple yet powerful tool enables a user to estimate vibration responses without directly using finite element models, so long as suitable H(sup s) and H(sup c) sets are defined in the database libraries. The paper discusses the preparation of the database tool and provides the assumptions and methodologies necessary to combine H(sup s) and H(sup c) sets into an integrated H(sup s + c). An experimental validation of the approach is also presented.
Publication Date: Apr 23, 2012
Document ID:
20120014481
(Acquired Oct 15, 2012)
Subject Category: ACOUSTICS
Report/Patent Number: M11-0876, M12-1662
Document Type: Conference Paper
Meeting Information: 53rd AIAA Structures, Structural Dynamics and Materials Conference; 23-26 Apr. 2012; Honolulu, HI; United States
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 26p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ACOUSTICS; CURVED PANELS; DATA BASES; EXCITATION; FINITE ELEMENT METHOD; LAUNCH VEHICLES; TRANSFER FUNCTIONS; VIBRATION; VIBRATIONAL STRESS
Miscellaneous Notes: PDF includes Conference abstract and paper
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