damping and free layer damping variants for reduced noise generation from turbulent boundary layer effects on all Swiftsure and Trafalger (S & T) class submarines.Another type of composite that is being used is acoustic materials design which includes material development testing and verification for energy absorbing anechoics, reflective transmission loss and decoupling materials and acoustically transparent RHO-C polyurethane systems.Predictive programs for acoustic requirements using TRANS, which is a software system to optimize acoustic material performance and multi-layer designs for acoustic treatments, arrays and baffles that are used in damping sound within the tight spaces and confines within a ship and will deter sound from being detected from other sources as far as for security and secrecy and moving about without detection,There is also a process called signature reduction and target strength reduction called TSR that is applied Using acoustic tiles or directly applied acoustic materials by casting and spraying techniques, that consist of mixing a two part a and b mixture of liquid polyurethane that when mixed together and heated by an element in the hose that it is sprayed from it can be sprayed uniformally to a surface and will harden up .this process will not only give radar dampening capabilities but also strengthen the most frail part of a compartment that a vessel has on it and is a very light composite and the very lightness of the material is very good to use on vessels that have to have a small amount on weight on them. Royal Navy S & T class submarines use a wide range of directly applied polyurethane acoustic materials Decoupling treatments on internal and external water flooded areas of hull, casings, sonar domes, windows, rudders and bridge fins are used on submarines and surface vessels(SVSR and SVTSR) to maintain signature control for anti detection of radar by other sources.It is also used on radomes an...
