Prediction, Improvement And Experimental
Verification Of Low-frequency Vibro-acoustic
Transmission Through Automotive Door Hinges
Author(s)
D. Desai, M. Heyns & M. Mbarawa
Abstract
For automotive manufacturers, the simulation of door panel vibration is an
important concern for various reasons. A mass of evidence has shown that the
vibration behaviour of door panels that enclose the passenger cabin can affect
low-frequency noise in the cabin. However, anecdotal evidence suggests that,
until now, the characterisation of structure-borne door panel vibration and its
subsequent noise emission characteristics in terms of its door hinge system has
not yet been contemplated or studied within a vibro-acoustic setting.
Thus, the primary contribution of this original work is to develop flexible
numerical models with full coupling between the passenger cabin and vehicle
body, to predict and improve the vibro-acoustic performance of the door hinge
system without the introduction of unique vehicle components.
The work undertaken entails the development of three-dimensional,
predictive finite element models to address this unique application in terms of
noise generation and mitigation. The improvement involves the study of
different door hinge systems provoked by an external structural forcing function
under steady-state conditions and subjecting them to sensitivity analysis. With
reference to an existing door hinge system, frequency domain numerical models
are developed and solved employing experimentally-determined damping ratios.
An experimental campaign is undertaken to validate the numerical models
based on frequency response data. The measured data were compared with the
predicted values, the results of which exhibited good correlation. Compared to
the reference design, a significant reduction in the interior noise level was
achieved by using the proposed sensitivity analysis procedure.
Keywords: fluid-structure interaction, NVH, automotive interior noise.
Keywords
fluid-structure interaction, NVH, automotive interior noise
Related Book
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