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Research on Simulation Method for Predicting Rattling Noise in MT Drivetrain

Article of Honda R&D Technical Review Vol.16 No.1

Summary

The level of rattling noise in the MT drivetrain system is closely related to the state of transmission input shaft rotational speed fluctuation. In this research, the loudness of the noise, which is proportional to the impact of the rattling idle gears caused by the rotational speed fluctuation, and the conspicuousness of the noise, which is caused by the existence of drivetrain resonance, was clearly identified. Furthermore, a drivetrain simulation method for predicting the state of rotational speed fluctuation was developed. In this simulation method, a clutch torsional characteristic defined by the dynamic torsion constant and equivalent damping force coefficient is used as the parameter to improve the accuracy. Consequently, it is now possible to obtain the optimum specification of clutch, the amount of moment inertia and the rigidity of drivetrain torsional characteristic to reduce the rattling noise level at on early stage of the development program.

Reference

(1) Mizutani, K., Hata, H.: The Nonlinear Torsional Vibrations of a Shaft System with the Hysteretic and Two-staged Torsional Stiffness, Transactions of The Japan Society of Mechanical Engineers, Vol. B, p. 497-500 (1995)
(2) Doman, Y., Nishikawa, K.: Technique to Solve NV Problems of a Clutch, Journal of Society of Automotive Engineers of Japan, Vol. 54, No. 4, p. 34-40 (2000)
(3) Yahata, S., Kizuka, T., Umemoto, O.: Prediction as to Idling Rattle of Manual Transmission (First Report), Transactions of Society of Automotive Engineers of Japan, Vol. 34, No. 1, p. 96-100 (2003)
(4) Hashimoto, H., Yamada, T., Takatsuki, K., Umezawa, K.: Improvement of Booming Noise Caused by Drive Line Torsional Vibration of a Heavy-duty Truck, Journal of Society of Automotive Engineers of Japan, Vol. 47, No. 6, p. 50-54 (1993)
(5) Sawatsubashi, T., Suzuki, T.: Kudoukei ni Okeru Giya Hauchi no Kaiseki, SUZUKI TECHNICAL REVIEW, Vol. 18, p. 20-25 (1992) (in Japanese)
(6) Tanaka, K., Saegusa, S.: Gensui no Tokusei to Toriatukai, Shindou Model to Simulation, Ouyougijyutu Syuppan, p. 130-142 (1984) (in Japanese)

Author (organization or company)

Eiji HANAI (Tochigi R&D Center)、Masakazu MITANI(Tochigi R&D Center)、Hiromasa NAKAMURA(Tochigi R&D Center)

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