Volume velocity measuring method using acoustic tube for engine noise evaluation

摘要

Volume velocity measurement method using an acoustic tube was developed and applied to engine noise prediction. Engine surface vibration measurement using accelerometers is very difficult in the case of exhaust manifold etc. In proposed method, a microphone with an acoustic tube was set in front of the an area on the engine surface in order to measure a specific volume velocity. Engine noise at a certain distance from the engine was predicted using the measured volume velocity and propagation characteristic. The predicted result are agreed well with the experimental data.