When one of the natural frequencies of the drive shaft coincides with the excitation frequency of the engine, the vibration amplitude of the drive shaft increases significantly owing to the resonance of the drive shaft at the natural frequency. To reduce this resonance vibration, a single-mode dynamic damper (SMDD) has been used. A dynamic damper yields second resonances because of the mass and stiffness of the damper, although the resonance vibration of the drive shaft is reduced considerably. To reduce vibration due to the second resonance, the vibration parameters of the SMDD, such as frequency, damping coefficient, mass, and stiffness, should be optimized. However, it is difficult to apply an optimized SMDD to a vehicle because it is difficult to achieve an SMDD with optimal stiffness and damping coefficient. This paper presents a new dualmode dynamic damper (DMDD) for the further reduction of vibration due to the second resonance. The stiffness and damping coefficient of the DMDD are changed according to the rotating angle of the drive shaft. The vibration reduction effect of the SMDD is constant at the positions of all rotating angles of a drive shaft; however, that of the DMDD is different at the position of every rotating angle of the drive shaft. In this study, the vibration reduction performance of the DMDD is compared with that of the SMDD. Finally, the DMDD is applied to the drive shaft of a passenger car, and its effect on vibration reduction is confirmed in a vehicle test.

当传动轴的某一固有频率与发动机的激振频率重合时，由于传动轴在固有频率发生共振，使传动轴的振动幅度显着增大。为了减少这种共振，使用了单模动态阻尼器 (SMDD)。由于阻尼器的质量和刚度，动态阻尼器会产生二次共振，尽管驱动轴的共振振动显着降低。为了减少由于二次共振引起的振动，应该优化 SMDD 的振动参数，如频率、阻尼系数、质量和刚度。然而，由于难以实现具有最佳刚度和阻尼系数的 SMDD，因此很难将优化的 SMDD 应用于车辆。本文提出了一种新的双模动态阻尼器 (DMDD)，用于进一步减少二次共振引起的振动。DMDD 的刚度和阻尼系数根据驱动轴的旋转角度而变化。SMDD的减振效果在传动轴所有转角的位置都是恒定的；然而，DMDD在驱动轴的每个旋转角度的位置都不同。在这项研究中，DMDD 的减振性能与 SMDD 的减振性能进行了比较。最后，将DMDD应用于乘用车的驱动轴，并在车辆试验中证实了其减振效果。DMDD 的刚度和阻尼系数根据驱动轴的旋转角度而变化。SMDD的减振效果在传动轴所有转角的位置都是恒定的；然而，DMDD在驱动轴的每个旋转角度的位置都不同。在这项研究中，DMDD 的减振性能与 SMDD 的减振性能进行了比较。最后，将DMDD应用于乘用车的驱动轴，并在车辆试验中证实了其减振效果。DMDD 的刚度和阻尼系数根据驱动轴的旋转角度而变化。SMDD的减振效果在传动轴所有转角的位置都是恒定的；然而，DMDD在驱动轴的每个旋转角度的位置都不同。在这项研究中，DMDD 的减振性能与 SMDD 的减振性能进行了比较。最后，将DMDD应用于乘用车的驱动轴，并在车辆试验中证实了其减振效果。DMDD 的减振性能与 SMDD 的减振性能进行了比较。最后，将DMDD应用于乘用车的驱动轴，并在车辆试验中证实了其减振效果。DMDD 的减振性能与 SMDD 的减振性能进行了比较。最后，将DMDD应用于乘用车的驱动轴，并在车辆试验中证实了其减振效果。