Dropped-Clutch 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 _dropped_clutch to form the complete analysis name. For example, if you enter test45 as the output prefix, the analysis name becomes test45_dropped_clutch.

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.

Clutch Actuation Time

Enter the time needed to engage the clutch. Adams Driveline uses this time to set the clutch_demand variable that goes from 1 (disengaged) to 0 (full engagement), in the specified time, using a STEP function.

Throttle Actuation Time

Enter the time needed to ramp up the throttle. Adams Driveline uses this time to set the Throttle_Demand variable that goes from 0 to the specified value during the throttle actuation time.

The clutch demand expression will be set to:

Throttle Final Value [0-100]

Enter a real number between 0 and 100 that represents the final value of the throttle to be reached during the dropped clutch analysis.

The throttle demand expression will be set to:

Start Actuation Time

Enter the time at which the clutch and the throttle engagement is supposed to start. This value makes it possible for you to have the model settle down before performing the dropped-clutch analysis.

Engine Dyno

Select an engine dyno element that Adams Driveline can use to apply the correct engine torque to the model. This depends on your selection of either the Open Loop or the Closed Loop option in the pull-down menu that follows.

Closed Loop

Select this option if you want Adams Driveline to keep a crankshaft part you specify at a specific speed until the clutch is engaged.

Crankshaft Part

Select the crankshaft part you want to use.

Engine Rpm

Enter an RPM value.

Open Loop

Select this option if you want Adams Driveline to apply a specific engine torque to the model without any control on the engine RPM value.

Constant Torque/Generic Torque Function

If you select Constant Torque, specify a constant engine torque value that will be applied to the model without any control of the engine RPM value.

Select to use the Function or Expression Builder to define a function. For information on the Function or Expression Builder, see Function Builder.

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.