Structural and acoustic damping characteristics of polyimide microspheres

Daniel L. Palumbo, Junhong Park

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

A broad range of tests have been performed to evaluate the capability of tiny lightweight polyimide spheres to reduce sound and vibration. The types of testing includes impedance tube measurement of propagation constant, sound power insertion loss for single and double wall systems, particle frame wave characterization and beam vibration reduction. The tests were performed using spheres made of two types of polyimide and with varying diameter. Baseline results were established using common noise reduction treatment materials such as fiberglass and foam. The spheres were difficult to test due to their inherent mobility. Most tests required some adaptation to contain the spheres. One test returned obvious non-linear behavior, a result which has come to be expected for treatments of this type. The polyimide spheres are found to be a competent treatment for both sound and vibration energy with the reservation that more work needs to be done to better characterize the non-linear behavior.

Original languageEnglish
Pages (from-to)6442-6454
Number of pages13
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume10
StatePublished - 2005 Dec 19
Event46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Austin, TX, United States
Duration: 2005 Apr 182005 Apr 21

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Microspheres
Polyimides
Damping
Acoustics
Acoustic waves
Vibrations (mechanical)
Acoustic impedance
Insertion losses
Noise abatement
Foams
Testing

Cite this

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