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Available
as an add-on capability to the Wheel Impact Load Detector
or as a stand-alone wayside installation, the Automatic
Vehicle Overload & Imbalance Detector (AVOID) reduces derailment
conditions and infrastructure damage by detecting and alarming
for overloaded or imbalanced rail cars at track speeds.
Using statistical analysis of multiple vertical load measurements
recorded by the detector, an estimate of the static weight
of a rail car is derived to determine if the rail car is
overloaded or imbalanced beyond safe operating limits.
Another feature of this system is its high speed weigh-in-motion
capability, which reduces the need to take individual rail
cars out of service for weighing. By moving much of the
weighing work from train yards to main lines, the railroads
can compete more effectively to recapture lost shipping
business. Low speed or revenue-scale weigh-in-motion systems
with an accuracy of +/- 0.1% command a very high price and
in many cases, require two to three days to return a train
to service. Some railroads and their customers are willing
to tolerate a limited degree of error in return for a less
expensive investment and faster system throughput. Though
not intended for use as a revenue scale, Salient's high
speed weigh-in-motion system provides an alternative to
weigh bridges by delivering a +/- 1% weighing accuracy over
95% of the time for a fraction of the cost. During the other
five percent of the time, the margin of error is within
+/-5% and is usually caused by defective wheels, though
sometimes by hunting trucks or other degraded conditions
that reveal themselves in the process.
In 1998 the Ministry of Railways, People's Republic of
China named Salient a certified supplier of high speed weigh-in-motion
systems.
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