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

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

Blog Article

In automatic transmissions for cars, a damper sunglass case is installed in the lock-up clutch to absorb torsional vibrations caused by combustion in the engine.Although a damper with low stiffness reduces the torsional vibration, low-stiffness springs are difficult to use because of space limitations.To address this problem, dampers have been designed using a piecewise-linear spring having three different stages of stiffness.However, a nonlinear subharmonic vibration of order 1/2 occurs because of the nonlinearity of the piecewise-linear spring in the damper.

In this study, we experimentally and analytically examined a countermeasure against the subharmonic vibration by increasing the stages of the piecewise-linear spring using the one-degree-of-freedom system model.We found that the gap between the switching points of the piecewise-linear spring was the key to vibration reduction.The experimental results agreed with Bicycles results of the numerical analyses.