Adams Car Package > Adams Car Ride > Dialog Box - F1 Help > Full-Vehicle Analysis: ARIDE_FOUR_POST_TESTRIG

Full-Vehicle Analysis: ARIDE_FOUR_POST_TESTRIG

Ride -> Full-Vehicle Analysis -> Four-Post Test Rig

For the option:	Do the following:
Full-Vehicle Assembly	Select the full-vehicle assembly you want to analyze. Tips on Entering File Names in Text Boxes.
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. Note: You must press this button before the dialog box will allow you to submit the analysis.
Output Prefix	Enter a string that specifies the Analysis Output Name. The string can contain only alphanumeric characters and underscores (_).
End Time	Specify the time, in seconds, at which the analysis ends.
Mode of Simulation	Select Interactive, Background, Files_only or Event only.
Basis for Number of Output Steps	Select one of the following: ■number of output steps - Set the total number of outputs (per individual output variable). These will be equally spaced from time = zero to time = End Time. ■output interval - Set the time interval between outputs. Adams Car Ride calculates the total number of outputs in terms of this number. ■output frequency - Set the time frequency at which outputs are stored. Adams Car Ride calculates the total number of outputs in terms of this number. We give you this option because it is often easier to think in terms of frequency than in terms of the total number of outputs or the interval between outputs. ■min. number of outputs per input - This option applies only when you select a swept-sine input. Using this option will set the output frequency to be equal to the number you select in the Target Value For Basis text box multiplied by the highest frequency of the frequency sweep. This number should ideally range from ten to twenty, but never be less than six. To prevent errors from aliasing, the frequency of outputs should be at least six times that of the highest input frequency that will affect outputs of interest. A factor of ten is much better, and a factor of 20 is very good.
Target Value for Basis	Enter the number corresponding to your selection above for Basis for Number of Output Steps. The units for this text box change to reflect the selection you made above.
Note: The following four text boxes display values that describe the number of outputs in each of the options you can select in Basis for Number of Output Steps. Different information from the simulation set-up is needed to fill-in these text boxes. A value will appear in a text box as soon as you provide enough information for Adams Car Ride to calculate its value. Note that these numbers might not be exactly the same as your selection in Target Value for Basis. This is because the values must be set so that an integral number of outputs is obtained.
Number of Output Steps	See Note, above.
Output Interval	See Note, above.
Output Frequency	See Note, above.
The following text box is displayed only when you set Input Source to swept sine.
Min. Number of Output Steps Per Input	See Note, above.
Actuation Type	Select one of the following: ■displacement ■velocity ■acceleration ■force Your selection determines the type of control that prescribes the behavior of the test-rig actuators. Note that sometimes an actuation type either does not apply (that is, it doesn't make sense physically given the vehicle model) or is not supported depending on other settings you choose. For example, if you set Actuation Type to force, Adams Car Ride automatically sets Input Locations to wheel spindles. This is because the other option for Input Locations, beneath tires, does not apply for Adams-compatible tire models that are supported in Adams Car Ride. Because the tire carcass itself is not modeled as a physical body, a force cannot be applied to it.
Input Source	Select one of the following: ■arbitrary solver functions ■road profiles ■swept sine ■RPC files Your selection determines the type of control function that prescribes the behavior of the test-rig actuators with the selected Actuation Type. The selections depend on the Actuation Type. For example, of the four Actuation Types, you can always select arbitrary solver functions and swept sine as control functions. However, road profile inputs are only supported when Actuation Type is set to displacement. Learn about RPC III Format
Input Locations	Select one of the following: ■beneath tires - The actuators will excite the vehicle by contact with the tires. ■wheel spindles - The actuators will excite the vehicle by control directly at the wheel spindles. If you set Actuation Type to force, only the wheel spindles option is applicable.
Vehicle Constraint	Select one of the following: ■No constraint ■xy constraint at body cog: The movements of the body of the vehicle will be limited by activating the JPRIM's body_stake and the yaw_stake
If you set Input Source to swept sine, Adams Car Ride displays the following options:
Start Frequency	Enter the frequency of the sinusoidal input at time = zero. The swept-sine input sweeps out the frequencies from Start Frequency to End Frequency linearly from time = zero to time = End Time. The Start Frequency can be higher than the End Frequency.
End Frequency	Enter the frequency of the sinusoidal input at time = End Time. The swept-sine input sweeps out the frequencies from Start Frequency to End Frequency linearly from time = zero to time = End Time. The Start Frequency can be higher than the End Frequency.
The label on the following text box changes to reflect the selection you made for Actuation Type. For example, if you set it to acceleration, the label changes to Acceleration Amplitude.
Displacement Amplitude	Select the amplitude of the sinusoidal control for the swept sine inputs. The name and units choices for this text box change to reflect your selection for Actuation Type.
Excitation Mode	Your selection determines the relative phase of the test-rig actuators during a swept-sine simulation. Select one of the following: ■heave - All actuators are in phase, thus causing a heave-type motion in the vehicle. ■pitch - The left and right actuators are in phase, but the rear actuators lag those of the front by 180 degrees, thus causing a pitch-type motion in the vehicle. ■roll - The front and rear actuators are in phase on each side of the vehicle, but the actuators on the right lag those on the left by 180 degrees, thus causing a roll-type motion in the vehicle. ■warp - The left-front and right-rear actuators are in phase. The right-front and left-rear actuators are also in phase, but they lag the left-front and right-rear actuators by 180 degrees, therefore causing a warp-type motion in the vehicle.
Active Actuators	Specify which actuators are active during a swept-sine simulation. Inactive actuators remain stationary. The options depend on your selection for Excitation Mode. For example, if you set Excitation Mode to heave, you can set all actuators to be active, front or rear, right or left, or any particular one. However, if you set Excitation Mode to warp, all actuators must be active because a warp simulation has little meaning otherwise.
If you set Input Source to arbitrary solver functions, Adams Car Ride displays the following options: Note: Set each of the following text boxes to an Adams Solver-function expression. You can enter the expression directly to create the function in the Function Builder. (When you exit the Function Builder, Adams Car Ride automatically enters the expression you created into the appropriate text box.) Enter 0 if: ■You want no motion of an actuator if the Actuation Type is kinematic. ■If you want the actuator to apply zero force at the spindle if you set Actuation Type to force. (In this case, the wheel associated with that actuator is not influenced by the test rig at all: it is free to fall.)
Left Front	See Note, above.
Right Front	See Note, above.
Left Rear	See Note, above.
Right Rear	See Note, above.
Solver Function Units	Select the units for your Adams Solver function expression. The options have dimensions consistent with the setting in Actuation Type. Solver functions that you enter should return a numerical value expressed in the units of the Solver Function Units setting. For example, suppose the Actuation Type is set to acceleration and Solver Function Units is set to g's. Your solver functions should evaluate to a numerical value expressed in g's. This is true regardless of the setting in the Setting/Units menu in Adams View.
If you set Input Source to road profiles, Adams Car Ride displays the following option:
Set Up Road Profiles	Select to display the dialog box Road-Profile Setup: ARIDE_FOUR_POST_TESTRIG, where you can set the road parameters.
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 Ride 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 Ride displays the Entity Comments dialog box. ■If recording comments for any other entity type, Adams Car Ride displays the Modify Comment dialog box. Learn more about Recording Comments.