Full-Vehicle Analysis: Acceleration

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 _accel to form the complete analysis name. For example, if you enter test_45 as the output prefix, the analysis name becomes test_45_accel.

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.

End Time

Specify the time, in seconds, at which the analysis ends.

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.

Enter the name of a file that contains road data information. The tire subsystems use this information to calculate the tire/road interaction forces.You can also use a 3D road in this context. Make sure that the vehicle remains on the road, because 3D roads are not as wide as 2D flat roads.

Tips on Entering File Names in Text Boxes.

Import and visualize road graphics from file.

Remove road or path graphics.

View road / path file in info window.

Edit road / path file in road builder or text editor.

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.

Start Time

Enter a real value that specifies the time at which the acceleration is to start.

Open-Loop/Closed-Loop Throttle

Select a mode for the Longitudinal Acceleration Controller:

Final Throttle

Enter the final position of the throttle as a percentage of total throttle displacement.

Duration of Step

Enter the time it takes to step from the initial throttle value to the final throttle value.

Longitudinal Accel (G's)

Enter the longitudinal acceleration, in G's, that will be maintained during the analysis.

Gear Position

Specify the initial transmission gear for the analysis. The powertrain subsystem uses this parameter, which generally acts as a gain, for the throttle-demand output from the cruise control. Gear shifting can be turned on.

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.

Steering Input

Select one of the following:

Shift Gears

Select if you want to enable gear shifting. This tells the Driving Machine whether or not the vehicle stays in the specified gear or shifts when engine limits are reached.

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.

Construct road graphics from event user inputs.