Clever engineering is required in all vehicles nowadays to achieve passenger comfort whilst also minimising vehicle weight. Cars, buses, trains and ships all require diagnostic testing to help reduce noise and vibration generated by rolling on the road or track and mechanical components, engines, pumps etc.. Similar techniques are also needed in aircraft. In this PhD, new techniques will be developed for analysing multi-channel acoustic and vibration signals from vehicles in operation. This will improve analysis of how noise and vibration is generated and transmitted through the vehicle and lead to quieter vehicles and /or weight reductions. Candidates will need a good degree or Masters in Mechanical Engineering.