Fundamental study of subharmonic vibration of order 1/2 in automatic transmissions for cars

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Ryu, T.^1 ; Nakae, T.^1 ; Matsuzaki, K.^2 ; Nanba, A.^3 ; Takikawa, Y.^4 ; Ooi, Y.^4 ; Sueoka, A.^5

Department of Mechanical and Energy Systems Engineering, Faculty of Engineering, Oita University, 700 Dannoharu, Oita-shi, Oita

870-1192, Japan^1

Graduate School of Science and Engineering, Kagoshima University, Korimoto 121-24, Kagoshima-shi, Kagoshima

890-0065, Japan^2

Department of Mechanical and Energy Systems Engineering, Graduate School of Engineering, Oita University, 700 Dannoharu, Oita-shi, Oita

870-1192, Japan^3

Core Component Engineering Department, Engineering Division, Aisin AW Co., Ltd., 10 Takane, Fujii-cho, Anjo-shi, Aichi

444-1192, Japan^4

Kyushu Polytechnic College, 1665-1 Shii, Kokura Minami-ku, Kitakyushu-shi, Fukuoka

802-0985, Japan^5

关键词: Analytical results;    Automatic transmission;    Experimental apparatus;    Fundamental studies;    Non-linear vibrations;    Single degree of freedom systems;    Sub-harmonic vibration;    Torsional vibration;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012206/pdf
DOI  :  10.1088/1742-6596/744/1/012206

来源: IOP

【 摘 要 】

A torque converter is an element that transfers torque from the engine to the gear train in the automatic transmission of an automobile. The damper spring of the lock-up clutch in the torque converter is used to effectively absorb the torsional vibration caused by engine combustion. A damper with low stiffness reduces fluctuations in rotational speed but is difficult to use because of space limitations. In order to address this problem, the damper is designed using a piecewise-linear spring with three stiffness stages. However, the damper causes a nonlinear vibration referred to as a subharmonic vibration of order 1/2. In the subharmonic vibration, the frequency is half that of the vibrations from the engine. In order to clarify the mechanism of the subharmonic vibration, in the present study, experiments are conducted using the fundamental experimental apparatus of a single-degree-of-freedom system with two stiffness stages. In the experiments, countermeasures to reduce the subharmonic vibration by varying the conditions of the experiments are also performed. The results of the experiments are evaluated through numerical analysis using the shooting method. The experimental and analytical results were found to be in close agreement.