of NVH (Noise, Vibration and Harshness) is a very important issue for
cars. Conventional suspensions are mounted directly to the chassis
via rubber bushing) so that NVH can be easily transmitted to the cabin.
One of the popular solutions is to mount the suspension onto a
(still via bushing), which is usually made of aluminium alloy or is
by hydroforming to minimize the addition of weight. The sub-frame
can absorb some of the NVH. It is in turn mounted to the body by more
thus reduce NVH further. The picture shows Porsche 993's rear
with sub-frame. Today, sub-frame mounting is no longer exclusive for
cars. The latest Opel Astra and VW Golf have sub-frame mounting too, so
do many GM mainstream models.
1998-2000 by Mark Wan
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