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Monday, July 8 • 17:50 - 18:10
FUNDAMENTAL STUDY ON OPTIMAL DESIGN OF DYNAMIC ABSORBER TO SUPPRESS SUBHARMONIC VIBRATION OF ORDER 1/2 IN AUTOMATIC TRANSMISSION FOR CARS

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In the torque converter of the automatic transmission for cars, a damper at the lock-up clutch is used to reduce the transmission of torsional vibration due to combustion in the engine. Although a damper with low stiffness reduces the transmission of vibrations, the fitting of low-stiffness springs is difficult because of space limitations. Therefore, a piecewise-linear spring with three stiffness stages is used for the damper in actual automatic transmissions. However, subharmonic vibration of order 1/2 occurs when the spring restoring characteristics of the damper is near the switching point of the piecewise-linear spring. In the subharmonic vibration of order 1/2, the fundamental frequency component is half of the forced vibration frequency, and the subharmonic vibration occurs when the forced vibration frequency range is about twice the natural frequency. In this study, experiments using a two-degree-of-freedom system were conducted to suppress the subharmonic vibration by the dynamic absorber, and the optimal design of the dynamic absorber is discussed. We conducted a theoretical analysis to determine the optimal design of the dynamic absorber to suppress the subharmonic vibration. The effects of the natural frequency and the damping ratio of the dynamic absorber to the vibration suppression are discussed. We found optimum values for the natural frequency and damping ratio of the dynamic absorber that suppress the subharmonic vibration effectively. The natural frequency of the dynamic absorber should not be set close to the excitation frequency but rather near the natural frequency of the system. Thus, subharmonic vibration is completely suppressed by using the optimum dynamic absorber. The experimental results agreed with results of the numerical analyses.


Monday July 8, 2019 17:50 - 18:10 EDT
Outremont 6
  T15 Road & rlway noise & vibr., SS02 Vehicle noise vibr & harshn

Attendees (7)