2011 Volume 67 Issue 2 Pages I_875-I_883
A structural sensing method using artificial vibrator and wireless sensor network is presented. In this method, the artificial vibrator excites very accurate harmonic vibrations to a target structure and accelerometers deployed on the structure observe the response. The observed acceleration data is collected to a central sever machine through wireless sensor network. Since the artificial vibrator is able to excite very accurate harmonic vibration and sensor nodes are time synchronized to the artificial vibrator, heavy stacking can be applied to the observed data on the sensor nodes. Besides, the response of excited vibration can be accurately estimated by means of discrete Fourier transform due to the time synchronization. These processes successfully compress the amount of data without collapsing the important information of the data that is the amplitude and phase of excited vibration. In this paper, development of the prototype system and the implementation of time synchronization between the artificial vibration source and wireless sensor node are described.
