| Abstract |
The purpose of this paper is to develop a method that can carry out remote sound collection and include automatic tapping test, convert and analyze sound files at the far end, and apply it to abnormal analysis of concrete structures. By capturing the echo signal after the far-end tapping and converting it into an analyzable sound file, it is transmitted to the near-end computer through the network server for analysis. The system is divided into four parts: percussion device, remote computer server, near-end computer analysis system, and network structure. Among them, in the part of the percussion device, a non-destructive percussion mode is applied to percussion concrete to generate sound waves. Set up FTP server and SSH encrypted command transmission on remote computer. In the network processing part, the private network domain architecture is used to simulate the actual situation applied to the public network domain in the future for audio file transmission. On the near-end computer, the LabVIEW software is used to write a program to perform fast Fourier transform on the echo wave to analyze the spectral energy, and calculate the position of the crack inside the concrete structure, so as to determine whether there is an abnormality in the structure, so as to provide a reference for practical application. This system can be applied to the natural disaster early warning system to achieve the goal of remote monitoring |
