(Standard Interface) Simulate -> Full-Vehicle Analysis -> Straight-Line Behavior -> Acceleration

For the option:	Do the following:
Full-Vehicle Assembly	Select the full-vehicle assembly you want to analyze. The menu lists all full-vehicle assemblies currently open in your session.
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.
End Time	Specify the time, in seconds, at which the analysis ends.
Number of Steps	Specify the number of output steps.
Mode of Simulation	Select interactive, background, or files only.
Road Data File	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.
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: • Open loop - Specify a final throttle value and a duration of step value. The throttle will step from its initial value to the final value in the specified duration. • Closed loop - Specify a longitudinal acceleration. The Driving Machine controls the clutch, throttle, and gear shifting. Learn about the Driving Machine.
If you select Open-Loop Throttle, Adams/Car displays the following option:
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.
If you select Closed-Loop Throttle, Adams/Car displays the following option:
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.
Steering Input	Select one of the following: • straight line - The controller tries to maintain a straight line. • free - Allows the steering wheel to rotate in response to forces transmitted to the steering subsystem from the tires and the suspension. • locked - Locks the steering wheel at the design position.
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. • For all cornering analyses, selecting this option causes Adams/Car to perform a SKID_PAD quasi-static analysis. • For all other analyses, selecting this option causes Adams/Car to perform a STRAIGHT (sometimes called ClearVision adjustment) analysis. 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. Note: You cannot select the Quasi-Static Setup option if: • You have a steerable conceptual suspension subsystem, because there is no feedback that goes from the wheel to the steering system. For information about conceptual suspension subsystems, see Introducing the Conceptual Suspension Module. • You do not have a powertrain subsystem in your vehicle assembly, because it is not possible to set the initial condition for the longitudinal or the lateral dynamics (throttle position).
Create Analysis Log File	Select if you want Adams/Car to write information about the assembled model and analysis to an analysis log file.
	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: • If recording comments for modeling entities in Standard Interface, Adams/Car displays the Entity Comments dialog box. • If recording comments for any other entity type, Adams/Car displays the Modify Comment dialog box. Learn where Adams/Car records comments.

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

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.

End Time

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

Number of Steps

Specify the number of output steps.

Mode of Simulation

Select interactive, background, or files only.

Road Data File

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.

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:

• Open loop - Specify a final throttle value and a duration of step value. The throttle will step from its initial value to the final value in the specified duration.

• Closed loop - Specify a longitudinal acceleration. The Driving Machine controls the clutch, throttle, and gear shifting. Learn about the Driving Machine.

If you select Open-Loop Throttle, Adams/Car displays the following option:

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.

If you select Closed-Loop Throttle, Adams/Car displays the following option:

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.

Steering Input

Select one of the following:

• straight line - The controller tries to maintain a straight line.

• free - Allows the steering wheel to rotate in response to forces transmitted to the steering subsystem from the tires and the suspension.

• locked - Locks the steering wheel at the design position.

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.

• For all cornering analyses, selecting this option causes Adams/Car to perform a SKID_PAD quasi-static analysis.

• For all other analyses, selecting this option causes Adams/Car to perform a STRAIGHT (sometimes called ClearVision adjustment) analysis.

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.

Note: You cannot select the Quasi-Static Setup option if:

• You have a steerable conceptual suspension subsystem, because there is no feedback that goes from the wheel to the steering system. For information about conceptual suspension subsystems, see Introducing the Conceptual Suspension Module.

• You do not have a powertrain subsystem in your vehicle assembly, because it is not possible to set the initial condition for the longitudinal or the lateral dynamics (throttle position).

Create Analysis Log File

Select if you want Adams/Car to write information about the assembled model and analysis to an analysis log file.

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:

• If recording comments for modeling entities in Standard Interface, Adams/Car displays the Entity Comments dialog box.

• If recording comments for any other entity type, Adams/Car displays the Modify Comment dialog box.

Learn where Adams/Car records comments.