Page 27 - ATZ11 November 2019 Professional

Adjustment distances pedals
x 94 mm
y 235 mm
z 65 mm
Adjustment distances seat
x 240 mm
y 145 mm
z 115 mm
Tilt (0°-5°) 140 mm
Adjustment distances steering/dashboard
x 290 mm
y 122 mm
z 200 mm
Tilt steering (0°-44°) 197 mm
Adjustment distances foot placement support
y 234 mm
Tilt (0°-60°) 197 mm
TABLE 2 Technical data of adjustment distances
FIGURE 5 Adjustment distance example of the variable mock-up (© Volkswagen) (corresponds with Figure 5) (© Volkswagen)

will be calculated out of the entered models from the VW Up to VW Crafter The combination with the motion plat-
data. The results will be sent back to can be represented. form, however, creates additional chal-
the Excel table and sent to a self-devel- lenges. The algorithm for tracking is less
oped tool. This tool controls the control complicated. The challenging part is the
VISUALIZATION
motors directly. calibration of the HMD and the light-
Before the real adjustment procedure The second feature of the simulator is houses. Cruden developed a user-friendly
begins, a homing of all control motors the usage of an HMD in combination workflow for this purpose. The head
has to be done. Subsequently, all motors with a motion platform, FIGURE 7. Cur- position is measured by the HMD and
will be moved according to their axis rent HMDs are optimized to have low is used to adjust the camera position in
definition after each other by the calcu- latency at maximum power. Unity relation to the reference camera point
lated distances and the components of natively provides support for different in VR. Therefore, the rendered image
the seat buck will be positioned. The HMDs. So for rendering without motion moves with the head position of the
adjustment distances of all motors are tracking, this can be done natively with driver. In a dynamic driving simulator,
chosen in such a way that all vehicle a Unity-based renderer. head tracking should be relative to the
physical mock-up.
However, the head tracking sensors
only work in a non-moving environment
with the HMDs in question. Therefore,
in this case it is not possible to measure
the HMD head position relative to the
mock-up directly. Instead, the static
HMD head position is used and the
movements of the platform are compen-
sated. When the motion platform is
moved, the HMD measures a different
position (relative to the room). However,
since no movement is expected in the
virtual world, the movement of the plat-
form must be subtracted from the HMD
position at Eq. 1 before it is used for ren-
dering:
Dimensional concept Calculation Adjustment

Eq. 1 M view,tracked =
FIGURE 6 Procedure for mock-up adjustment: from the dimensional concept to calculation and adjustment
−1
(© Volkswagen) M HMD ( M MOT2HMD M MOT ) M view
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