Two UK-based specialists in the noise-reduction field are developing new technology that promises a substantial decrease in cabin noise. Developed by Ultra Electronics of Cambridge and QinetiQ of Farnborough, it is based on a hybrid system of trim panel mounts that incorporate both active and passive noise-reduction elements. The system
is expected to reduce the amount of broadband noise produced by the rushing of air over the fuselage by minimizing trim panel vibration. Laboratory tests suggest a cabin noise reduction of at least 10 decibels. A full flight demonstration is the next step.