FEM simulation for the design of a smart washer-type sensor with FBG for use in metro-railway platform door security systems

These article presents a new approach to improving the safety and efficiency of Platform Door Security Systems in transportation networks using instrumented washers equipped with FBG sensors. The methodology included finite element analysis to identify regions of maximum deformation in customized washers, ensuring the precise placement of the FBG sensors. These "smart washers" proved highly effective in detecting load variations, such as the additional weight of objects or individuals, by linking mechanical deformation to changes in the Bragg wavelength. This innovative solution showed excellent sensitivity and accuracy, highlighting its potential for real-time monitoring of mechanical stresses and enhancing safety by reducing risks.