174
Vehicle Dynamics and Driver Assist Systems
May 2017
The second series of measurements are designed to place the vehicle squarely in relation
to the SST Random Chart mounting surface. The preferred mounting surface is mobile white
board or similar flat/mobile surface. However, a wall may be used as a mounting surface for the
Random Chart.
Vehicle body center line (A-B line)
Point D
Point C
4,000 mm (13 ft, 1 1/2 in)
Point D
Point F
Baseline
Baseline
Random Chart Location
Base Line Measurement
Completing the measurements has produced a “base line” that is square, centered, and a
specific distance from the front wheels of the vehicle. At this point the SST Random Chart
can be prepared. The Random Chart contains markings on the lower portion to align it with
the “base line” and properly set the height. If a mobile white board is used, it is critical that
the plumb bobs be allowed to freely hang from the Random Chart to the floor without any
obstructions such as penholders.
Protrusion (penholder, etc.)
Plumb bob
Vehicle travel
direction
RANDOM CHART
White board
Protrusion (penholder, etc.)
Vehicle travel
direction
RANDOM CHART
White board
Plumb bob
SST Random Chart Mounting
(a) = Setting reference (vertical line)
and vehicle body center line (C-D line)
(b) = Setting reference (horizontal line)
(b)
(a)
Vehicle body
center line
Horizontal line
Plumb bob
Floor
1,000 mm
(3 ft, 3 3/8 in
SST Random Chart Preparation
4-136
4-137
4-138
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