GSP9700 Series Road Force Measurement System Operation 4. Balancing a Wheel 61
4.5 ForceMatching™
ForceMatching™ is a method of aligning the stiffest spot of the radial tire road force
first harmonic (once-per-revolution component) with the average low point of the
radial rim runout first harmonic to decrease vibration in the wheel assembly. Refer to
“Theory of Operation,” page 131. This type of match mounting has been done with
expensive equipment by the tire/wheel manufacturers and OEMs for years to provide
the smooth ride associated with a new vehicle. This is the first time equipment is
available to provide “ForceMatching™” at a service level. When the GSP9700
performs a spin with the load roller enabled, it measures the road force of the wheel
assembly. Refer to “Road Force
Measurement,” page 133.
NOTE: It is important that the air pressure of the tire is set to
specifications prior to the Road Force Measurement.
Incorrect tire pressure will affect the results.
If the GSP9700 is equipped with the Inflation Station feature,
the tire can be easily set to the specified air pressure before
and after ForceMatching. Refer to “Inflation Station,” page
81.
After measuring the assembly, if it detects a Road Force Measurement beyond
user specified limits, it prompts the operator to measure rim runout. Refer to “Rim
Runout Measurements,” page 54.
After measuring rim runout, the results will be shown on the “Current Runout & Road
Force” popup screen.
NOTE: ForceMatching™ results and benefits are not computed until
rim runout is measured.
If limits are enabled in the setup mode then the “Current Runout & Road Force”
screen “Diagnosis” box will display a message informing you whether ForceMatching
will be beneficial. The diagnosis and basis for calculating conclusions is always
based on the limits chosen by the operator from the Balance Screen and Setup
Mode.
If the wheel assembly can be corrected by ForceMatching™, the diagnosis box will
display “ForceMatching procedure will bring assembly within limits” and the
components will be listed as “Pass,” “Marginal,” or “Limit Exceeded.” If non-first
harmonic component limits are exceeded, the “Diagnosis Explanation” popup screen
will automatically appear. Refer to “Diagnosis Explanation Screen,” page 95.
TIRE ROAD FORCE
MEASUREMENT
LATERAL RIM RUNOUT
MEASUREMENT
ASSEMBLY ROAD
FORCE MEASUREMENT
RADIAL RIM RUNOUT
MEASUREMENT
ASSEMBLY DIAGNOSIS
COMPONENT
EVALUATIONS
The “Show After ForceMatching” key may be selected to view the estimated road
force that will remain after the ForceMatching procedure has been completed.
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