The application of electrically powered steering concepts (EPS) has significantly changed the contribution to vehicle acoustics. Many hydraulic steering related noise patterns have left the vehicles with the elimination of the hydraulic systems as well. The aim of this paper was to show if and how the EPS systems influence the acoustics of the vehicle and what can be done to control it? It has been shown that the electric motor, gear modules, bearings, belt and controllers can be the main components generating noise inside the EPS by their nature and so they can be contributing to the noise spectrum inside the vehicles now. Under normal operating conditions, electrically powered steering systems mainly influence the vehicle acoustics in the frequency range up to 2 kHz. Their level of air-borne noise is negligible in acoustical means - in most cases even not audible and they do not exhibit any noise in standby condition as well which is especially advantageous to hybrid and battery electric vehicles. Despite the above positive aspects, the acoustics of EPS systems still remains challenging in terms of noise avoidance or even reduction, especially in the low frequency regions, where there are also a lot of vehicle environment contributors as well. Some key functional aspects of the steering system require a compromise between noise and functional performance as well. Thus, understanding of the signature of steering subcomponents in the overall in-vehicle noise spectrum is very important. It has been discussed in great detail here. And finally, it was shown that it is of great advantage to understand the noise transfer function within the chassis into the passenger compartment. In order to achieve good noise characteristics for the vehicle with regard to EPS, we need both, NVH optimization of the steering system and of the vehicle sensitivity.
Do electric steering systems influence the interior acoustics in vehicles?
2012
19 Seiten, 13 Bilder, 3 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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