The sound barrier’s bolts inspection method based on wireless acceleration sensing system

As one of the facilities adjacent to the track, the bolts on the high-speed railway sound barrier are an important structure to ensure the safe operation of the railway. However, the traditional manual inspection method has shortcomings, so the automated and intelligent bolt inspection method has become a hot spot in research and development. In this paper, a wireless acceleration sensing system (WASS) based on a MEMS accelerometer is established, and the vibration response change under bolt loosening is analyzed so as to propose a new bolt inspection method. The experimental results show that the top of the sound barrier column is the best detection position. In the vibration acceleration spectrum obtained by WASS, the position changes of the three characteristic peaks can reflect different bolt loosening. The WASS developed has the characteristics of intelligence and remote availability, which will solve the problems existing in the bolt inspection technology of high-speed railway sound barriers and become a strong guarantee for safety maintenance.