Abstract
In this paper, we develop a damage identification method for beam stractures based on the measurement of bending wave excited by ambient noise. First the ambient noise data acquire by arrayed sensor and separate it into the forward-going and the backward-going wave components in freqency domein using dispersion relation. Then we put the transfer function into above-referenced two wave conponents. Finally we can get information about damage existance and position by estimate impulse response which acquired by inverse Fourie-transform of transfer function.
