Full-Vehicle Analysis: Braking on Split µ

Full-Vehicle Assembly

Select the Full-Vehicle Assembly you want to analyze. The menu lists all full-vehicle assemblies currently open in your session.

Assembly Variant

Select the assembly variant you want to analyze. The menu lists all full-vehicle assembly variants of the chosen assembly.

Switches to the selected variant and adds the required testrig as needed.

Output Prefix

Enter a string that specifies the Analysis Output Name. The string can contain only alphanumeric characters and underscores (_). Adams Car appends the suffix _pos to form the complete analysis name. For example, if you enter test_45 as the output prefix, the analysis name becomes test_45_pos.

Solver Settings File

Select one or more files (extension .ssf) defining the solver settings to be temporarily applied for this simulation (optional).

Opens the Solver Settings File (extension .ssf) editor dialog box.

Number of Steps / Step Size / Step Frequency

Select either of the following:

Simulation Mode

Select interactive, background, graphical, files or event only.

See Mode of Simulation: Interactive, Mode of Simulation: Graphical, Mode of Simulation: Background, Mode of Simulation: Files_only, Mode of Simulation: Event_only.

Initial Velocity

Enter the initial speed of the vehicle in the units specified in the pull-down menu to the right of the Initial Velocity text box.

Steering Input

Select one of the following:

Brake Step Start

Enter the duration of the initial-set pre-phase. The second mini-maneuver starts after the start time has elapsed.

Brake Step Duration

Enter the time it takes to step from the initial brake value (usually zero) to the final brake value. This is equivalent to the period of time taken to depress the brake pedal and brake pressure to build up.

Brake Final Value [%]

Enter the final value of the brake demand. This value will depend on how your brake system is modeled and the default units that have been used.

Road Friction Coefficient

Specify the road friction coefficient for the left and right road segments, effective during the 2nd mini-maneuver. During the 1st mini-maneuver, the friction coefficient is 1.0 for the whole width of the road.

Gear Position

Specify the initial transmission gear for the analysis. The powertrain subsystem uses this parameter that generally acts as a gain for the throttle-demand output from the longitudinal controllers.

Adams Car stores the gear ratios in the powertrain subsystem.

Suggested Gear Position based on desired Initial Velocity (or equivalent lateral acceleration and curvature radius for constant radius cornering events). The button suggests the gear position for the event in order for the engine speed to be in the range between stall speed and max revolution limit.

Disengage Clutch during Power-Off

Select it if you want Adams Car to operate the clutch with a specified delay and step duration once the braking maneuver starts. If you do not select it, Adams Car doesn't release the clutch during the braking mini-maneuver.

Throttle Delay

Specify the amount of time between the end of the first mini-maneuver and the actual brake actuation.

Throttle Step Duration

Specify the duration of the throttle step signal. The throttle is stepped down to zero in the specified amount of time.

Clutch Delay

Specify the amount of time between the end of the first mini-maneuver and the actuation of the clutch signal.

Clutch Step Duration

Specify the duration of the clutch step signal. The clutch signal is stepped down from zero to one (clutch disengaged) in the specified amount of time.

End Condition Type

Select the condition type to be monitored to end the transient analysis of the 2nd mini-maneuver.

The first mini-maneuver uses a combined end condition for constant velocity.

End Condition Trigger

Select the trigger operator and value for the condition sensor type selected above.

Please note that the AllowedError and filterTime parameters for the end condition definitions are predefined. Their values can be adjusted by changing the following design variables:

The delayTime parameter value is hard coded to be zero.

Abort Time

Specify the time, in seconds, at which the analysis should abort if the end condition does not trigger.

Regen Ratio

If Toggle button selected then enter regeneration ratio using expression.

Expression

Enter regeneration braking ratio value or expression.

Quasi-Static Straight-Line Setup

Select to perform a quasi-static prephase analysis before running the transient analysis on your full-vehicle assemblies.

If you do not select this option, Adams Car performs a SETTLE analysis.

For more information about the different quasi-static setup method keywords (such as SETTLE and STRAIGHT), see Structure of Event Files.

Create Event Log File

Select if you want Adams Car to write information about the assembled model and analysis to an Analysis Log File.

Add Vehicle Dynamics Requests

Activates requests computing certain vehicle dynamics outputs during the full vehicle event.

Some of these additional requests are required for standard post-processing (reports and plots).

Compute Characteristic Values

Activates requests computing suspension and steering characteristics during the full vehicle event.

The additional requests are equivalent to those previously already available for suspension analysis.

See Output of Suspension Analyses in Adams Car - Running Analysis for more details.

Select to display a dialog box where you can add multi-line comments to any entity, to describe its purpose and function. Adams Car displays different comments dialog boxes, depending on the entity type for which you want to record comments:

Learn about Recording Comments.

Select to display an Alignment dialog box where you can set toe, camber and caster alignment values.