Technical Paper
Test Bench for the Acoustic Behaviour of Air-Boxes for Motorcycles
2002-10-29
2002-32-1812
Air-boxes as a part of the intake system of small engines especially for motorcycles create a specific noise radiation. Simulation methods and experimental investigations to analyse and predict the acoustical behaviour of air-boxes for motorcycles are required in order to pass current noise control legislation and to achieve a pleasant sound. This paper presents the design of a test bench for the investigation of air-boxes for motorcycles. The test bench is equipped with measurement systems for monitoring and recording volumetric flow, speed, pressure data and sound data. The sound radiated from the air-box is produced by the pulse flow in the engine induction system. The investigation of the air-box sound at real engine operation is impossible because of the noise produced by the engine. The created gas exchange system is distinguished by a rotating disc with a cut-out section, which opens and closes a pipe instead of the valves in the real engine.