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Experimental and Finite Element Investigation of Free Vibration Behaviour of Car Bonnet


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DOI: https://doi.org/10.15866/ireme.v11i7.12853

Abstract


Bonnets are elegant and primary components of cars. They blanket the engine, radiator and several other parts. Pedestrians and occupants safety is the most important criteria in automobile bonnet design, which is mainly influenced by stiffness and strength requirements. However, the stiffness needs are different from strength needs, that is why bonnets have a unique and integrated design. In the present study, the vibration analysis of a proposed two dimensional finite element (FE) model of a bonnet is carried out to estimate the damage occurrences which directly affect its stiffness and strength. Initially, a flexibility matrix is obtained from the static analysis of the FE model for intact and damaged bonnets with appropriate boundary conditions. The matrix equation is solved to determine the natural frequencies to be compared with those obtained from the finite element (FE) analysis as well as from the experimental vibration analysis of the bonnet. It is observed that the results are in good agreement.
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Keywords


Bonnet; 2D FE Model; Flexibility Matrix; Modal Analysis; Experimental Techniques

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References


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