Abstract
For the forced excitation of a large structure such as airplanes using one actuator, natural vibration mode cannot be excited because the vibration does not spread in the entire structure. So vibration tests of a large structure use a lot of actuators. When we drive a lot of actuators by centralized control, we have to adjust command signal, such as excitation frequencies, the magnitude and phase of the excitation force, to every natural vibration mode. Thus, we used a method for driving at resonance point by using the self-excited vibration generated by the local feedback control that an excitation point corresponds to a vibration detection point. The excitation target is a laminar structure modeled on an airplane. The sixth mode is excited by using sixteen voice coil motors with the local feedback controller. The self-excited vibration cannot excite all natural vibration modes, because some natural vibration modes have changed to the other one which is easily excited. So we use forced entrainment to excite a desired mode of vibration.
