Abstract
In optimal vibration control, the control characteristics of vibration depend on the criterion function and the coordinate system in the modelling, since the objective function is not necessarily described by the state variables. In this study, the relationships between the control characteristics and the criterion functions were investigated for the two cases of ignoring the dynamics of disturbance and restricting the frequency range of disturbance in the optimal control with the feedforward control due to lack of knowledge of the dynamics of disturbance. By carrying out numerical calculations, it was clarified that the optimization of the objective function can be given by feedforward control restricting the frequency range of disturbance, and that the same control effectiveness as the sky-hook damper can be obtained by choosing the absolute velocity as the objective function.
