Browse Publications Technical Papers 2018-01-1481


Nowadays, perception of automotive quality playing a crucial role in costumer decision of vehicle purchase. Hence, automotive OEM’s are now working on the philosophy of “sound is quality”. Out of all the NVH issues identified in a vehicle, the ranking of BSR stands high and glove box rattle is one of the issue that is continuously popping up in all customer verbatim. Specific issues like lid rattle and latch rattle are predominant and gets worse over mileage accumulation. Also minimizing BSR issues in glove box is difficult due to latch mechanism. While deciding the bumper specifications more weightage is given to efforts. The bumper is selected in a way not to increase the opening and closing efforts, but many a times the selected bumpers will not provide enough preload to glove box lid leading to rattle issues. Also, the contradictory requirements between efforts and rattle makes the scenario more difficult to fine tune the bumper specifications. In the present study, an attempt is made to drive the glove box design from BSR point of view by carrying out rattle simulation on glove box assembly. The ultimate aim is to minimize the BSR issues in assembly without affecting glove box operating efforts. The methodology is implemented with realistic themes for modelling and the analysis is performed by utilizing current software capabilities. Meaningful information has been extracted to analyze the influence of bumper design in glove box rattle. The rubber bumper pretension force FP and calculated dynamic force, FD are key parameters in estimating the BSR performance of glove box assembly. The present work is limited to minimize the rattle issues at glove box lid and latch interface alone. Internal latch rattles are out of scope of this study. The non-linear behavior of rubber bumper is not considered because of small deformation values.


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