Title page for ETD etd-10212005-015333

Type of Document Master's Thesis
Author Sesler, Josh J
Author's Email Address joshsesler@gmail.com
URN etd-10212005-015333
Title Implementation of Refractory Foam Technology for Silencing Small IC Engines
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Burdisso, Ricardo A. Committee Chair
Saunders, William R. Committee Co-Chair
Fleming, Jon Committee Member
  • Refractory foam
  • Sound absorption
  • Absorptive material
  • Dissipative muffler
  • Silencer
Date of Defense 2005-09-09
Availability unrestricted
With the need for stealth in defense applications steadily increasing, noise reduction

continues to play an important role in the world of aeronautics. With the ever increasing

number of small UAV flight vehicle designs and their stringent weight requirements,

acoustic solutions become progressively more complex. This thesis investigates the use

of refractory foam, a new class of porous material, for designing effective silencers for

small IC engines. The solution must be lightweight, compact, conformable, and capable

of handling the rigors of flight. Throughout the course of this research, many silencer

designs were fabricated to take advantage of refractory foam technology. These silencer

designs were then tested against existing designs using both anechoic and outdoor testing

techniques. These results proved refractory foam to be a superior broadband noise

absorber that can survive harsh flight environment. Silencer designs using this material

showed overall improvements in the areas of noise reduction, weight, size, and

backpressure, compared to commercial designs. The final silencer design boasted an Aweighted

overall sound pressure level that was 12.1 dBA lower than the reference case.

This result was accomplished using nearly half the volume required by other designs to

attain similar results.

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