Vibration Control of Structure by State Switching of a Floater using Acceleration Signals

Abstract

　This research expresses a novel active vibration control method for structures by using magnetic levitation (MAGLEV) technologies. When a vibration occurs, an iterative MAGLEV device is developed to levitate and contact the celling of structures properly. The device is in contact when the product of ceiling displacement and velocity is positive, and non-contact when it is negative. To make the device float stably, a sliding mode control method is used. A vibration control target simulating a two-story house is subjected to standing wave excitation and random excitation. The standing wave excitation adds vibrations near the first- and second-order natural frequencies. Similarly, random excitation adds a random excitation that emphasizes each of the first- and second-order eigenfrequencies. The amplitudes of the displacements of each ceiling are derived by Fourier transform and compared. The experimental result shows the effect of this device on the vibration control of the structure.