title: Modeling and validation of polyurethane based passive underwater acoustic absorber.
abstract: The acoustic behavior of an acoustically transparent polyurethane and an interpenetrating polymer network of polyurethane with polydimethyl siloxane were studied using dynamic mechanical analysis, finite element modeling, and experimental evaluation of acoustic properties in a water-filled pulse tube setup. Dynamic mechanical measurements in the temperature range -50 °C to +70 °C were carried out, and the data were used for time temperature superposition to generate material behavior at high frequencies. These inputs were used for modeling the acoustic behavior of these materials using ATILA, which is a commercial finite element code, capable of computing transmission and reflection characteristics of materials. From this data, absorption characteristics were computed. The results were compared with the experimental results obtained using a water-filled pulse tube facility.
authors: Naval Physical and Oceanographic Laboratory, Defense Research and Development Organisation, Thrikkakara, Kochi-686021, Kerala, India.
authors: V G
authors: VG
authors: Jayakumari
authors: Rahna K
authors: RK
authors: Shamsudeen
authors: R
authors: R
authors: Ramesh
authors: T
authors: T
authors: Mukundan
mesh_terms: D000042:Absorption; D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004129:Dimethylpolysiloxanes; D004867:Equipment Design; D020342:Finite Element Analysis; D008962:Models, Theoretical; D009038:Motion; D009622:Noise / Q000517:prevention & control*; D011140:Polyurethanes; D015203:Reproducibility of Results; D013018:Sound Spectrography; D013696:Temperature; D013997:Time Factors; D014867:Water
chemical_list: D004129:Dimethylpolysiloxanes; D011140:Polyurethanes; D014867:Water; C013830:baysilon