K. L. Koudela, G. H. Koopmann, W. Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The objective of this study was to design, fabricate, and test an active panel capable of significantly reducing the radiated sound power from a vibrating structure. To accomplish this objective, a cascaded flextensional actuator was embedded in a composite sandwich panel consisting of inner and outer E-glass/epoxy face sheets separated by a foam core where portions of the core were removed to accept a high performance actuator. The actuator consisted of a cascaded flextensional, mechanical amplifier driven by two, co-fired, multi-layered, piezoceramic stacks. The stack displacements were amplified by the cascaded flextensional to generate the levels of surface normal vibrations of the panel's composite face sheets to produce the desired sound power reductions. A prototype active composite sandwich panel containing a single embedded cascaded flextensional actuator was fabricated and an experiment was conducted to evaluate its dynamic response. Dynamic finite element analyses were performed to simulate the experiment. Good correlation was obtained between the predictions and the experimental results. Final testing was conducted in air in a sound transmission loss facility to determine the levels of sound pressure reduction achievable with the prototype active composite sandwich panel. Up to a 25 dB reduction in sound pressure level was obtained over the frequency band of interest.

Original languageEnglish (US)
Title of host publicationNoise Control and Acoustics
Subtitle of host publicationVolume 1 � Active Noise and Vibration Control; Complexity in Acoustics; Noise Sources in Internal Combustion Engines; Vehicle Flow/Structure Noises; Aeroacoustic Sound Propagation in Ducts and Jets; Turbomachinery Noise; BS/MS Student Paper Competition
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages6
ISBN (Electronic)9780791815328
StatePublished - 1996
EventASME 1996 International Mechanical Engineering Congress and Exposition, IMECE 1996 - Atlanta, United States
Duration: Nov 17 1996Nov 22 1996

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)


ConferenceASME 1996 International Mechanical Engineering Congress and Exposition, IMECE 1996
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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