Noise characterisation is a critical research area for varied domains and applications. The domains

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Noise characterisation is a critical research area for varied domains and applications. The domains include marine, aviation, transport, civil engineering etc. The applications could include numerous military and non military applications like fatigue failures in material, human comfort, acoustics stealth, marine mammal habitat assessment, condition based monitoring of machineries etc. In many engineering situations, machines are mounted on flexible structures such as the ships deck, aircraft fuselage, car or train chasis, building floors etc.
When in operation machines may transmit noise and vibrations to the receiving structures, causing unwanted noise and vibration problems close to remote from source location. In recent years, noise
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Thus an accurate characterization of the dynamic behaviour of vibrating system and emanating noise with respect to its frequency, amplitude, and power over a broad range of frequencies is needed to develop reliable simulation models, suggest passive design strategies and propose active control concepts. [2]. Three elements namely the source, path and receiver play an important role in noise generation and transmission. The field of acoustics and vibration majorly deals with the characterisation and control of noise source and noise transmission path ( air borne and structure borne paths). While for airborne sound, a sourcepath- receiver model has been a practically proven model, inherent physical problems have prevented a similar approach being adopted for structure borne sound. Also, most Literature have stated that it is the structure borne sound source which are the main cause of noise problems [3], [4] and due complexity of built up structures, characterisation of structure borne noise source and transmission has been a major field of applied research till date. Most research publications available on sound shielding pertains to problem connected with lessening noise in industrial, housing, public buildings and surface and air transport vehicles. The field of shipboard acoustics has found relatively weak expression in scientific and technical literature till as far as 1960s. Ship board acoustics are distinguished from architectural acoustics by several
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