Browse Publications Technical Papers 2019-01-1537

Design of innovative noise sealing grommets used in commercial vehicles and their experimental noise sealing performance characterization 2019-01-1537

In today’s automobile industry refined NVH performance is a key feature and of high importance governing occupant comfort and overall quality impression of vehicle. One of key challenging elements is the effective sealing of noise against direct infiltration from various locations including the gaps and holes of vehicle routing pipes and cables. This paper starts with the design of innovative grommet profiles for noise sealing while not affecting the ease of fitment and manufacturing .Various iterations were carried out to arrive at final grommet designs for both single and dual pipes configurations, and the final designs area discussed in details. This is followed by the characterization of grommet noise sealing behavior with respect to frequency spectrum, in Insertion loss chambers and then comparison of same with original designs .Further, the design of proposed grommets are compared and discussed for noise sealing performance. The paper also investigates the effect of pipe protective cover on the grommet noise sealing performance. Experiments are done both -with and without sealing of the pipe protective cover, and then the grommet performance is re-verified in insertion loss chamber, hence establishing the maximum sealing potential of these grommets. So this paper covers both the design consideration as well as practical testing of the sealing grommets and gives insight on the noise sealing behavior. The paper concludes with recommended design for a good noise sealing performance, both for the grommet and mating pipe construction.


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