Experimental Verification of the Dynamic Numerical Model of a Fire Engine Structural Part

Abstract

An aluminium superstructure of a fire engine was created and mounted on the chassis. Some dynamic characteristics were obtained in laboratory conditions (Lab. CIAH - Faculty of Mechanical Engineering in Belgrade). An aproppriate numerical model was formed using beam and thin plate finite elements. Calculations were done using the finite element method, Program package KOMIPS, as it is presented in this paper. At first, comparative analisy of the experimental and numerical results verified the numerical model. Further dynamic analysis of the behaviour of one structural part of fire engine were done only numericaly. Stiffnesses of the supports variated and appropriate dynamic behaviour was obtained. Eigen-frequencies were calculated and presented together with the amplitudes. Forced damped vibrations in frequent domain were calculated. Dynamic method in analysing is a very reliable method if the reconstruction of a structures is needed.