driving simulator performance variables: an overview ronald r. mourant – northeastern university...
TRANSCRIPT
Driving Simulator Performance Variables: An Overview Ronald R. Mourant – Northeastern University – [email protected]
Possible Dependent Variables For Driving Scenarios
• Vehicle path profiles• Vehicle velocity profile• Heart rate and / or GSR• Driver search and scan patterns• Number of collisions or incidents• Time to take evasive / protective action
activate brake activate accelerator turn the steering wheel
Recording a Vehicle's PathRecording a Vehicle's Path
Scenario: Lane Change into Gap
Factors to be Analyzed
• Lane deviation
• Steering angle deviation
• Eye glances (number & duration) to left-side & center mirrors during 3 periods for each scenario:
1. Pre-lane change - begins with the command to make a lane change
2. During lane change
3. Post-lane change - ends 4 seconds after vehicle is in the desired lane
Time: X-Coordinates & Mirror Sampling Plot - Lane Change into Gap After First Lane-Change Beep,
For One Experienced Driver
Performance Measures for Scenarios
• Time (s): Elapsed time since the start of the run in seconds.
• X Position (ft): Driver position in the X axis in feet.
• Y Position (ft): Driver position in the Y axis in feet.
• Distdriven (miles): Distance driven since the start of the run, in miles.
• SpeedCar (mph): Speed of the vehicle in miles per hour.
• Acceleration (mph/s): Acceleration of the vehicle in mph/s; deceleration will be negative.
• Gas: Gas pedal value in units returned by the hardware.
• Brake: Brake pedal value in units returned by the hardware.
Performance Measures for Scenarios• StrAng (deg): Angle turned by the steering wheel from the original position
in degrees.
• StrVel (deg/s): Angular velocity of the steering wheel in degrees per second.
• TrackerYaw (deg): Head turn angle as measured by the head tracker, in degrees.
• Crashed?: If there was a crash, prints 1, otherwise 0.
• StopLineCrossed: Prints out the stop line’s start and end points if it were crossed between this time stamp and the previous.
• DistToCenterLine (ft): Distance to the centerline from the driver position is output in feet. Intersections and areas that do not have a visible centerline, have an imaginary centerline that smoothly connects the centerlines of its adjacent road segments in the direction of travel. For example if we were to make a turn, the centerline of an intersection will be a curve, and if the requirement was to go straight at an intersection, that centerline would be a straight.
• TileId+RoadId: This variable acts as a cross reference to the XML file and also will be useful in identifying a certain section of the run for analysis depending on the TileId and RoadId.
Driver Turn Profile - Tile1
11,590.00
11,610.00
11,630.00
11,650.00
11,670.00
11,690.00
11,710.00
11,730.00
-480 -460 -440 -420 -400 -380 -360 -340 -320 -300 -280
X
Y
Driver path
road seg1
road seg2
road seg3
road seg4
road seg5
centerline1
centerline2
centerline3
Driver Turn Profile - Tile1
11,590.00
11,610.00
11,630.00
11,650.00
11,670.00
11,690.00
11,710.00
11,730.00
-480 -460 -440 -420 -400 -380 -360 -340 -320 -300 -280
X
Y
Driver path
road seg1
road seg2
road seg3
road seg4
road seg5
centerline1
centerline2
centerline3
Deceleration & Acceleration Profile
0
5
10
15
20
25
30
35
40
45
50
0.12 0.14 0.16 0.18 0.2 0.22 0.24
Distance Driven/(miles)
Velocity/(mph)
Speedcar(mph)
Stop Line
Velocity Vs. Time
0
5
10
15
20
25
30
35
40
45
21 23 25 27 29 31 33 35 37 39
Time/(s)
Velocity/(mph)
SpeedCar
Yaw Vs. Time
-40
-30
-20
-10
0
10
20
30
40
50
0 10 20 30 40 50 60 70 80
Time
YawHead Turn
Bicycle Distraction ScenarioImplemented at NortheasternUniversity [email protected]