Statistics
FwdWin can track certain statistics such as the
number of test sequences and drops completed by a
given machine. These statistics are stored in a
database and are serial-number specific. In other
words, if you use the same computer to run two or
more FWD/HWDs, the program will keep separate
statistics for each. Note that the operator can
overwrite the numbers shown in the Sequences and
Drops fields. Pressing UUOUUK saves the changes and
closes the window. Pressing UUAUUpply saves the
changes but leaves the window open. The Apply
button is “greyed-out” (disabled) until some change
is made in one of the fields. The UUCUUancel button
discards any changes and closes the window.
The program also monitors and records the plate pressure, pavement centre deflection, and
length of time required to raise the weights to a specific height. This information pertains
only to the last drop completed at each fixed drop height. The program also calculates the
velocity with which the weight is raised. Velocity information is required since the height
stops may be occasionally moved thus changing the time required to lift the weights to a
certain height.
This information is useful for troubleshooting such problems as e.g.:
Inadequate charging systems - as loading unit batteries discharge, weights are lifted
progressively slower.
Effects of cold weather on loading unit hydraulics – thickening of the fluid due to
cold temperatures will slow the system down
Air accumulation in loading unit hydraulics – air in the hydraulic fluid will slow the
system down
It is a good idea for the operator to record typical values for “RW Duration” and “Raise
Weight Velocity” when the system is new or known to be in good operating condition. This
will provide a baseline for later comparisons.
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