Step-Torque Analysis

Assembly

Select the assembly you want to analyze. The menu lists all open assemblies.

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 Driveline appends the suffix _step_torque to form the complete analysis name. For example, if you enter test45 as the output prefix, the analysis name becomes test45_step_torque.

End Time

Enter a number greater than zero to specify the duration of the Simulation.

Number of Steps

Enter the number of output steps in output files (.req, .gra). It affects the resolution of your animations and plots. Make sure that the number of steps you specify is high enough to display the highest frequency you want to observe.

Mode of Simulation

Select interactive, background, or files only.

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

Road Data File

Specify a road data file. Tire subsystems use the information in road data files to calculate the tire/ground interaction forces. If your model uses ride tire subsystems, Adams Driveline automatically deactivates this text box because tire/ground interaction forces are evaluated in a different way.

For more information about road data files, see the Adams Tire online help.

Initial Velocity

Enter the initial velocity of the car at the beginning of the simulation. You can enter any number greater than or equal to zero. Adams Driveline uses this value to run an initial velocity analysis just after the static equilibrium and to set all rotational velocities of the driveline.

Adams Driveline performs this initial velocity analysis using a CONSUB. You can check the syntax in the .acf File. Adams Driveline automatically deactivates this text box when there is no body or roller rig subsystem in the selected assembly, because it assumes that without any of these subsystems it doesn't make sense to specify an initial velocity.

In the text box to the right of Initial Velocity, select the most suitable units set for the initial velocity. Before performing the analysis, Adams Driveline automatically converts the model units to the specified units set.

Gear Position

Select the initial gear to be used during the simulation. Adams Driveline sets the transmission_demand in the test rig to the value you specify.

If the model you want to analyze contains gear-pair elements, then Adams Driveline engages the correct one to both the input and output shafts with kinematic joints.

Time to Initial Torque

Enter the duration during which the Initial Torque is ramped up from 0.0 to the Initial Torque Value. If not specified, the Initial Torque is applied immediately after statics.

Initial Torque Value/Final Torque Value

Enter the initial and final torque values. Adams Driveline applies a STEP function between these two values to deliver the correct torque at each time step.

Step Start Time

Enter the time at which the torque must ramp up from the initial torque value to the final torque value.

Duration of Step

Enter the time needed to transition from the initial torque value to the final torque value. At time = step_start_time + duration_of_step, the torque will be fully developed and equal to the final torque value.

Engine Dyno

Select the engine dyno you want to use to apply the correct engine torque to the model. During the analysis set-up phase, Adams Driveline sets the dyno type to torque and the function type to torque demand, so that the maneuver can be submitted correctly.

Create Analysis Log File

Select if you want Adams Driveline to write information about the assembled model and simulation to a log file.

Adams Driveline names this log file after the output prefix and an output suffix, depending on the full-vehicle analysis you selected. The log file contains information about the type and success of the analysis, date and user, analysis parameters, and the active subsystem used in the simulation.

Select to display the Modify Entity Comments dialog box, where you can add multi-line comments to any entity to describe its purpose and function.

Learn about Recording Comments.

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

Friction Coeff

Select to display the Modify Friction Coefficients dialog box. If you have an assembly with rtire models, you can use the Modify Friction Coefficients dialog box to modify the friction characteristics for each tire.

For information about rtire, see Ride Wheels.