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Modeling and validation of polyurethane based passive underwater acoustic absorber
V G Jayakumari1, Rahna K Shamsudeen, R Ramesh
1Naval Physical and Oceanographic Laboratory, Defense Research and Development Organisation, Thrikkakara, Kochi-686021, Kerala, India.
The Journal of the Acoustical Society of America
|September 1, 2011
Summary
This study investigated the acoustic properties of polyurethane and a polyurethane-polydimethyl siloxane blend. Finite element modeling and experimental tests confirm their potential for acoustic applications.
Area of Science:
- Materials Science
- Acoustics
- Polymer Science
Background:
- Acoustically transparent materials are crucial for underwater applications.
- Understanding the acoustic behavior of polymers is essential for designing advanced materials.
Purpose of the Study:
- To analyze the acoustic properties of a polyurethane and a polyurethane-polydimethyl siloxane interpenetrating polymer network.
- To compare finite element modeling predictions with experimental results for these materials.
Main Methods:
- Dynamic mechanical analysis (DMA) from -50°C to +70°C.
- Time-temperature superposition for high-frequency behavior extrapolation.
- Finite element modeling using ATILA software.
- Experimental acoustic evaluation in a water-filled pulse tube setup.
Main Results:
- The study successfully modeled the acoustic transmission and reflection characteristics.
- Computed absorption characteristics aligned with experimental findings.
- Both materials demonstrated acoustically relevant properties.
Conclusions:
- The combined approach of DMA, time-temperature superposition, and finite element modeling accurately predicts acoustic behavior.
- The investigated polyurethane and blend show promise for applications requiring acoustic transparency and absorption.
