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| Home > Support
> Tech Talks
> VQI latest update 27/02/10 |
VQI 3-sensors System
3-sensors unbalance measuring system with
nearly-ideal mechanical ties
For a quality wheel balancing, a perfect mechanical design is a must.
FASEP wheel balancers are built around the VQI System. VQI ("Vincoli Quasi
Ideali" = nearly ideal mechanical ties), is a unique 3-sensor system, a FASEP exclusive
design.
Developed in collaboration with the University of Florence, VQI is a system
for
measuring vibrations designed so that mechanical ties do not influence the
measuring system.
As a result, plane separation is practically perfect and in/out influence
(also know as "cross-talk" or "side-to-side influence) is
practically null.
VQI infact allows accuracy on any size (big diameter, big width) and drastically reduces "cross-talks" (side-to-side influence).
The basic point of this unique design is that it is a
3-sensors system. By mean of the 3-sensors, the system is
"intrinsically stable" and no strong mechanical ties are needed.
To understand this fact, imagine a
3-legged table that stands while a 2 legged table falls: the 3-sensor system "stands"
completely on the sensors and this is sufficient to
make it stable.
On the contrary, a 2-sensors systems, need at least
one mechanical tie to be stabilized.
In the 2-sensors systems, the presence of one or more mechanical ties alters the
measurements of vibrations, as the vibrations may not completely go through the sensors but, at least
partially,
they go through the mechanical ties.
[When mechanical ties are present, a "parametric" modeling of the measuring system is necessary, as the system changes every time that the tie changes (i.e.: micro variations from one unit to another, variations of temperature, replacement of parts of the system). Therefore, a simple self-calibration may not be enough, but a "factory calibration" is needed, to compensate errors in measurements.]
In 3-sensors VQI System, the centrifugal force caused by the unbalance goes completely through the sensors as there is no other mechanical tie. In such way, the vibration force is therefore completely known and measured. This makes sure that in every condition and with any type of wheel, wide small or, measurements will be always perfect.
view from top
the measuring system stands on the 3 sensors
exploded view
with the 3 sensors (yellow) clearly visible
Fabio Boni
2/12/2003
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