This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Study on Intake Noise Generation in Marine Outboard Motors
Technical Paper
2005-32-0076
Annotation ability available
Sector:
Language:
English
Abstract
Noise reduction is the needs of the time even for (demanded even from) the outboard motors which are typically used under heavy load and in higher engine speed for an extended period of time. For the sound emitted by an outboard motor, the acoustic impression to human ears largely depends on the high frequency intake noise. The high frequency intake noise is generated by the air flow that passes through the intake pipes at high speed. The test performed with a flow stand bench demonstrated that the sound pressure increment relative to the increasing flow velocity is definitely larger in high frequency band compared with that in low frequency band. Pressure wave form inside the intake pipe was measured relative to the crank angle. The measurement revealed that the high frequency sound is generated in the later part of the intake stroke when the flow velocity within the intake pipe becomes the highest.
Recommended Content
Technical Paper | Measuring Vibration Characteristics in Seating |
Technical Paper | Sound Quality Evaluation of Exhaust Note During Acceleration |
Technical Paper | Reciprocal Powertrain Structure-borne Transfer Functions Synthesis for Vehicle Benchmarking |
Authors
Citation
HORI, Y., ICHII, T., MIKAMI, M., and KOJIMA, N., "Experimental Study on Intake Noise Generation in Marine Outboard Motors," SAE Technical Paper 2005-32-0076, 2005.Also In
References
- Obata Teruo “Prediction of Intake- and Exhaust-System Noises (in Japanese)” Journal of Society of Automotive Engineers of Japan 42 12 1606 1612 1988
- Inaba Motohiro Abe Eiichi “Low-noise and Low-pressure Loss Techniques for Exhaust System Design (in Japanese)” Journal of Society of Automotive Engineers of Japan 39 12 1401 1406 1985
- Inaba Motohiro Saigo Fumitaka Hayakawa Yoshikazu “Low-noise and Low-pressure Control Technology for Exhaust System (in Japanese)” Journal of Society of Automotive Engineers of Japan 41 13 1562 1567 1987