입력소스의 위치와 센서개수에 따른 평판에서의 시간반전램파의 공간집속성능 규명

Investigating the spatial focusing performance of time reversal Lamb waves on a plate with respect to input source location and the number of sensors

The spatial focusing of time reversal Lamb waves on a plate has attracted considerable attention for identifying the location of an input source. This study investigates the spatial focusing performance on a plate with respect to the number of piezoelectric (PZT) sensors for varying locations of input sources. In particular, a small number of PZT sensors produce spatial focusing through the virtual sensor effect due to reflection of Lamb waves at plate edges. The spatial focusing performance with respect to the number of PZT sensors is quantified in terms of signal to noise ratio through numerical simulation and its implication is discussed.