Run the Full Vehicle Analyses
Create a generic assembly or open the tractor or tractor_semitrailer assembly to perform a full vehicle analysis. A suggested event is given below.
Static
■From the Simulate menu, point to Full-Vehicle Analysis, point to Static_and_Qstatic_Maneuvers, and select Static_Equilibrium:
■none, normal, settle
■straight (60mph, 6th gear)
■skidpad (60m radius, .2g, 4th gear), (100m radius, .1g, 4th gear for Tractor&Trailer)
Open-Loop Steering Events
■From the Simulate menu, point to Full-Vehicle Analysis, and select Open-Loop Steering Events:
■step steer (5s, 60mph, 6th gear, 45deg, .5s start time, .5s step duration, angle input, qss)
■swept-sine steer (10s, 45mph, 6th gear, 90d, .2Hz initial, 3Hz max, .2Hz/s rate, 0s start time, angle input, cruise control, qss)
■ramp steer (10s, 35kph, 2nd gear, 20deg/s, 0s start time, angle input, cruise control, qss)
■impulse steer (5s, 60mph, 6th gear, 45deg, .5s start time, .5 step duration, angle input, qss)
■drift (15s, 60mph, 6th gear, initial throttle 50, throttle ramp 10, steer angle 0, qss)
■fishhook (45mph, 6th gear, first steer angle 45deg, .5s step, .5s duration, 2nd steer angle 90deg, .75s step, 2s duration, qss)
Straight-Line Events
■From the Simulate menu, point to Full-Vehicle Analysis, and select Straight-Line Events:
■open-loop acceleration (10s, 500 steps, 35kph, start .5s, final throttle 100, .5s step time, 2nd gear, straight-line steering, shift gears, qss)
■closed-loop acceleration (10s, 500 steps, 35kph, start .5s, 0.05g, 2nd gear, straight-line steering, qss)
■open-loop braking (5s, 500 steps, 60mph, start .5s, final brake 80, 1s duration, 6th gear, straight-line steering, qss)
■closed-loop braking (5s, 500 steps, 60mph start .5s, .5g, 6th gear, straight-line steering, qss)
The straight-line-behavior analyses include:
Acceleration Analysis
During an acceleration analysis, the Driving Machine ramps the throttle demand from zero at your input rate (open loop) or you can specify a desired longitudinal acceleration (closed loop). You can specify either free, locked, or straight-line steering. An acceleration analysis helps you study the anti-lift and anti-squat properties of a vehicle.
To set up an acceleration analysis:
1. From the Simulate menu, point to Full-Vehicle Analysis, point to Straight-Line Events, and then select Acceleration.
3. Select OK.
Braking Analysis
During a braking analysis, the Driving Machine ramps the brake input from zero at your input rate or lets you specify a longitudinal deceleration (closed loop). You can also specify either free or locked steering. The braking test analysis helps you study the brake-pull anti-lift and anti-dive properties of a vehicle.
To set up a braking analysis:
1. From the Simulate menu, point to Full-Vehicle Analysis, point to Straight-Line Events, and then select Braking.
3. Select OK.
Braking on Split µ Analysis
During a braking on split µ analysis, the Driving Machine ramps the brake input from zero at your input rate while the left and right tires are on road segments with different road friction. You can also specify either free or locked steering. The braking on split µ test analysis helps you study the behavior of active brake, damper and traction controllers in a vehicle.
To set up a braking on split µ analysis:
1. From the Simulate menu, point to Full-Vehicle Analysis, point to Straight-Line Events, and then select Braking on Split µ.
3. Select OK.
Maintain Analysis
During a maintain analysis, the Driving Machine either controls the throttle signal to maintain a constant longitudinal velocity, or holds the throttle demand constant (open loop). You can specify either free, locked, or straight-line steering. A maintain analysis helps you study the drive controller behavior for the properties of your vehicle model, and identify transient effects not active during static vehicle set-up pre-phase.
To set up a maintain analysis:
1. From the Simulate menu, point to Full-Vehicle Analysis, point to Straight-Line Events, and then select Maintain.
3. Select OK.
Power-off Straight Line Analysis
This analysis allows you to examine operating behavior and directional deviations caused by suddenly lifting off the throttle pedal during a straight-line analysis. Typical results collected from the power-off straight-line analysis include variations in heading direction and longitudinal deceleration. Optionally, you can depress the clutch during the throttle lift-off. In this case, you specify the duration that it takes to depress the clutch.
The Driving Machine drives the vehicle through two distinct phases:
■Quasi-static setup - The vehicle is set up in a straight line, to reflect the initial longitudinal velocity condition.
■Power-off event - The throttle signal is stepped down, from the value of the initial set mini-maneuver, to zero.
To set up a power-off straight line analysis:
1. From the Simulate menu, point to Full-Vehicle Analysis, point to Straight-Line Events, and then select Power-off Straight Line.
3. Select OK.
Closed-Loop Cornering
■From the Simulate menu, point to Full-Vehicle Analysis, point to Cornering Events and select Constant Radius Cornering.
■dynamic constant radius
with static setup (4th gear, 60m radius, .2g initial, .25g final, 10sec duration for Tractor)
without static setup (40m entry, 3sec settle time)
■From the Simulate menu, point to Full-Vehicle Analysis, point to Cornering Events and select Braking-In-Turn.
■braking-in-turn (4th gear, .2g lateral, 85m radius, maintain radius, .2g decel, 5s duration, qss)
■From the Simulate menu, point to Full-Vehicle Analysis, point to Static and Quasi-Static Maneuvers, and then select Constant Radius Cornering.
■quasi-static constant radius (.4g and 85m radius)