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