Title page for ETD etd-02232010-113639

Type of Document Master's Thesis
Author Corcoran, Joseph Michael
Author's Email Address jmc82@vt.edu
URN etd-02232010-113639
Title Output-Only Experimental Modal Testing of Large Residential Structures and Acoustic Cavities Using Sonic Booms
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Burdisso, Ricardo A. Committee Chair
Inman, Daniel J. Committee Member
Reichard, Georg Committee Member
  • acoustic cavity
  • residential structure
  • sonic boom
  • Natural Excitation Technique (NExT)
  • Modal testing
Date of Defense 2010-02-09
Availability unrestricted
In this thesis, an output-only experimental modal testing and analysis technique known as the Natural Excitation Technique (NExT) is examined for use with large residential structures and interior cavities. The technique which assumes a random, stationary input causing the response data is reviewed and extended for the first time to include the assumption of an impulse input. This technique is examined with respect to the experimental modal analysis of single and two room residential structures. Each structure is first tested using conventional modal testing methods. Then, NExT is applied using each structure’s response to a simulated sonic boom, an impulsive input. The results of these analyses along with the results obtained from a finite element model are compared. Then, the interior cavities enclosed by the residential structures are examined using NExT. Therefore, this thesis also demonstrates the successful use of NExT on acoustic systems for the first time. Three configurations of the interconnected cavities enclosed by the two room structure are considered to study physical phenomena. Both interior pressure response to random, stationary inputs and the sonic boom response are used with NExT to determine modal properties. The results of these analyses are compared to a theoretical analysis. Advantages to using NExT with both the response to a random, stationary input and an impulsive input are demonstrated for structural and acoustic systems.
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