Mode analysis on the rail car of fire robot based on FEA

The rail car of fire robot, which is used for carrying the robot enter the rail tunnel, is a accessory with a bed type structure. In this paper, a mode analysis model of the rail car has been founded based on finite element analysis (FEA), and the vibration modes and corresponding natural frequencies have been obtained from the simulation. The impaction caused by the rail joint has simply as a periodic excitation, and the frequency of the excitation has calculated due to the contain speed. Compared the simulation results, the theoretically resonance frequency band has been avoided. And the tow points, which have the min sum of the displacements in each mode, were chosen as the best location of cable suspension positions, and the points bring the minimize deformation and vibration excitation to the rail car.