프로펠라 샤프트의 최적 진동감쇠 시스템

초록

This paper presents a solution of the vibration reduction in the propeller shafts. Generally, the vibration mode in propeller shafts can be divided into the bending and torsional vibrations. And the bending vibration is significant factor when it excites with the resonance frequencies in the propeller shafts. However, since the torsional vibration is also the critical source of vibration problem at the automotive vehicle, it is necessary to analyze bending and torsion vibration together with the natural frequencies and demonstrate optimal position of damping to reduce the vibrations. In this paper, optimal vibration damping structures of propeller shafts is introduced to actively absorb the combined bending and torsional vibrations. Proposed active damping system is built by embedding the piezofiber actuators that are composed of piezopatches based on the Macro Fiber Composite (MFC) technology. The MFC is an innovative actuator that offers high performance and flexibility. The MFC patch is more flexible, durable and powerful than other piezo - materials, it is the best candidate of actuator to apply to the curved surface of the shaft. In order to calculate the vibration modes in the propeller shafts, analytical method and Finite Element Method are used. And to simulate effect of vibration damping, Piezoelectric-thermal analysis is used, too. The most effective locations of damping featuring MFC can be identified using Response Surface Model. Finally this paper provides an outlook for the active damping using the active controllers.