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Prediction Technology of Output Power and Intake-Exhaust Noise Using 1D-Simulation for Small-Displacement Motorcycles

Article of Honda R&D Technical Review Vol.22 No.2

Summary

Using a 1D simulation that transforms the 3D shape of intake-exhaust systems into one dimension and calculates the thermodynamics and fluid gas dynamics of internal combustion engines, a prediction technology of the output power and intake-exhaust noise for small-displacement single-cylinder motorcycles was established. Output power can be calculated accurately for various engines with different displacements and cooling systems by adjusting the boundary conditions in the calculation model. The intake-exhaust noise can be calculated accurately by clarifying some important points for accuracy when transforming the 3D shapes of the intake-exhaust system into the 1D model and by reflecting them in the calculation model. As for mufflers that have complicated internal structures, the calculation of exhaust noise cannot be made with sufficient accuracy because 1D simulation does not calculate spatial flow behavior. But, enhancement of accuracy is expected using a 1D-3D coupled simulation.

Reference

(1) Kido, H., Kuwahara, H., Brechlin, E., Boonen, R.: Modeling the Sound Source of an Intake and Predicting the Intake Sound Pressure Level for a Motorcycle, SAE paper, 2003-32-0058 (2003)
(2) Yagi, S., Fujii, I., Sono, H., Ishibashi, Y., Fijiwara, K.: Total Engine Loss and Engine Output Characteristics in Four Stroke S.I. Engines, HONDA R&D Technical Review, Vol. 3, p. 99-114
(3) Ciocci, F., Noceti, D., Bradamante, E.: Intake System Analysis of the 550 Maranello using the WAVE code, http://www.ricardo.com/Documents/Downloads/pdf/wave_intake_system_analysis_ferrari.pdf
(4) Wirtz, R., Mazzoni, D.: Application of WAVE in Motorcycle Prototyping, http://www.ricardo.com/Documents/Downloads/pdf/wave_motorcycle_prototyping_ducati.PDF
(5) Mochkaai, Y.: GT-POWER as a Tool for Acoustic and Dynamic Optimization of Exhaust Systems, http://www.gtisoft.com/confarch/EMCON2009.pdf
(6) http://www.ricardo.com/en-gb/Software/Products/WAVE/
(7) http://www.ricardo.com/en-gb/Software/Products/VECTIS/

Author (organization or company)

Hiroshi HORIKAWA(Motorcycle R&D Center)、Hideki KIDO(Motorcycle R&D Center)、Satoshi IIJIMA(Motorcycle R&D Center)、Yasuo MURAKAMI(Motorcycle R&D Center)

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