Audi A6 242 - Vibration and Natural Frequency

8
Principles
The natural frequency of the bodywork
The vibrations are defined by the degree of
amplitude and its frequency. The natural
frequency of the bodywork is particularly
important during matching of the
suspension.
The natural frequency of unsprung parts is
between 10 Hz and 16 Hz for a medium-size
vehicle. Appropriate matching of the
suspension system reduces the natural
frequency of the bodywork (sprung mass) to
between 1 Hz and 1.5 Hz.
Vibration
If a mass on a spring is deflected from its rest
position by a force, a restoring force develops
in the spring which allows the mass to
rebound. The mass oscillates beyond its rest
position which results in a further restoring
force being exerted. This process is repeated
until air resistance and the internal friction of
the spring causes the vibration to cease.
242_021
Rest position
Mass
Spring
Vibration
Rebound
Compression
1 cycle
Amplitude