Browse Publications Technical Papers 2019-26-0006

A Robust Structure Analysis on Automotive Door Armrest 2019-26-0006

An automobile door is one vital commodity which has its role in vehicle's function, strength, safety, dynamics, storage and aesthetic parameters. The door system comprises of door upper, bolster, armrest, main panel, map-pocket, handle and speaker grille. Among them, armrest is an integral part, which provides function and takes care of some safety parameter for the customers. The basic function of an armrest is to provide ergonomic relief to occupant for resting his hand. Along with this, it also facilitates occupant safety during a side impact collision by absorbing the energy and not imparting the reactive force on occupant. Thus an armrest has evolved as a feature of passive safety. The armrest design should be stiff enough to withstand required vertical load condition with-in the acceptable deflection criteria. On the other hand, armrest has to absorb the dynamic force by deflecting proportionally to the side impact. In this study the various structure of armrest was analyzed to strike an ideal zone between functional and safety parameters. The scope is to improve the functional requirement, i.e., the side impact metrics as per OEM specific DVP&R and also to reduce the variation among the noise factors. For this, DFSS way of approach is handled to optimize a robust design which provides enhanced passive safety for customer. The different armrest structure CAD models were designed in NX® and virtual analysis were carried out in pre-processor ANSA®, post-processing solvers LS-DYNA® and ABAQUS®. In virtual analysis, the armrest is subjected to dynamic loading condition and the resultant deflection is analyzed for the acceptance criteria. Physical testing was carried out with the proto model of armrest. Simulation results were well correlated with the physical testing within an error of 10%. This optimized passive safety design can be used for upcoming programs and the development lead time can be reduced considerably.


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