Abstract
This paper proposes a method to generate a resonance by variable damping in a vibration system. A simple single-degree-of-freedom base excited model with a variable damper is considered. The coefficient of the variable damper is changed like a sine wave, i.e. parametric excitation which of the frequency can be freely chosen. The damping force generated by the variable damper is a product at the variable coefficient and the relative velocity of the system between the base and the mass. By the multiplying, new vibration that has another frequencies besides the input frequency can be arisen. Therefore, the controllable oscillation of the damping coefficient in a suitable frequency can generate new vibration that has the same frequency as the natural frequency of the vibration system. As a result, the amplitude of the vibration system increases because of a phenomenon that is similar to common resonance. In this paper, we clarify the facts on the growth of the amplitude by the proposed method in analysis and simulation.
