Abstract
In recent years, the importance of torsional vibration reduction technology has been increased because reducing the number of cylinders of an engine leads to increasing the torque fluctuation from the engine and deterioration of the NV performance, and active research and development is under way. Among them, we have developed a variable dynamic damper (VDD) whose stiffness is continuously variable so that the resonance point follows the rotation speed. Transient dynamo tests assuming an actual vehicle were conducted and its performance was clarified. Furthermore, a theoretical analysis model was constructed and compared with the experimental results to clarify its validity.
