Experimental-Numerical Modal and Impact Analysis of Car Bumper

Abstract

The objective of this study is to validate the experimental modal analysis of bumper results with numerical modal analysis of bumper. The bumper model is created through CATIA V5 R20, meshing and analysis is done through HYPERMESH and OPTISTRUCT respectively. The main aim of the modal analysis is to find out natural frequency, mode shapes to avoid failure of car parts. If the natural frequencies of bumper or any other parts equal to natural frequency of the engine system leads to failure of system. Impact analysis is carried through ANSYS LS DYNA workbench which determines deformation and acceleration. Hence we design the bumper system, such a way that natural frequency of bumper and any other car parts should not coincide. Experimental results shows low values compare to the numerical results. The impact test is carried out at speed of 48km/h (13926 mm/s), in order to determine the deformation and acceleration. The new bumper model has lesser deformation and acceleration compare to old model, thereby it reduces the impact energy transformation and it will reduce the injuries to passengers.