Vibration Control Using a Dynamic Vibration Absorber with Air Damping

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The expressions for design of two types of air dampers are developed, which are called viscous air damper and non-viscous air damper. These air dampers are suitable for the dynamic vibration absorber (DVA), because they can supply the large amount of damping without using high-viscous fluids. The piston of the air damper vibrating in the cylinder functions as a mass of DVA,and the kinetic energy of the piston is transformed into the heat and dissipated to the surroundings. The piston receives a restoring force in addition to the damping force. Thus, it is very difficult to find the optimum tuning and damping conditions of DVA with air damping. We propose simple expressions to calculate the optimum tuning condition of DVA.The optimum damping condition of DVA is obtained by the numerical analysis. The equations required in the analysis are supplied in this report. We made an optimally tuned and damped DVA with air damping on the trial basis, and attached to a vibratory system. It was observed that the vibration amplitude of the system is reduced to only 1 percent. According to our study, the effect of DVA on the primary system can be estimated fairly accurately by the theoretical calculation. This study is not finished, however, and there are many proplems to make the DVA fit for the practical use. We shall continue our study until we develop a procedure to design systematically the optimally tuned and damped DVA with air damping.