Adams Car Package > Adams Car > Dialog Box - F1 Help > Component Analysis

Component Analysis

For the option:	Do the following:
Component Assembly	Select the component assembly you want to analyze. The menu shows all open component assemblies. If it shows No component assemblies, then you must open or create an assembly. You can use either of the following ways to open or create an assembly: ■File -> New or File -> Open ■ tool, described next
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.
	Right-click to display the following, left-click to select any of them: ■ - Select an existing assembly and use it for the component analysis. This is an alternative method to selecting it directly from the Component Assembly menu. ■ - Open an assembly from a file. Once loaded, Adams Car displays the assembly in the Component Assembly menu. ■ - Create a new assembly. Once created, the new assembly will be displayed in the Component Assembly menu.
Output Prefix	Enter a string that specifies the Analysis Output Name. The string can contain only alphanumeric characters and underscores (_).
Actuation Type	This option is followed by either force or motion, indicating how the test rig is configured to stimulate the component during the analysis. This simply displays the setting in the Actuation Type pull-down menu on the Component Analysis: Set Up Test Rig dialog box.
Excitation Function	Select an analysis type: ■Set of Frequencies - Perform a discrete frequency and amplitude sweep. You use this analysis to determine the loss energy and dynamic stiffness of a component. ■Range of Frequencies ■Continuous Sweep ■Quasi Static ■User Function ■Damper Sweep
If you select Set of Frequencies, Adams Car displays the following options:
Frequency	Enter one or a list of frequency values. If you enter a list of frequencies, make sure that you separate each entry by a comma (1.0, 2.0, 3.0, ...).
Maximal Cycles	Enter the maximum number of cycles to be performed during one analysis. If you enable the Energy Sensor, the simulation might stop before reaching the maximum number of cycles because the model has reached a steady-state condition.
Steps per Cycle	Enter the desired number of steps per cycle.
Excitation Amplitude	Enter one or a list of amplitude values. If you enter a list of amplitudes, make sure that you separate each entry by a comma (1.0, 2.0, 3.0, ...).
Phase	Enter the phase of the excitation function. Adams Car applies the phase with an initial step.
Loop over	Select the inner loop of a series of analyses (Amplitude or Frequency). This produces loss angle and dynamic stiffness over amplitude or frequency.
Energy Sensor	Select one of the following: ■On ■Off The analysis stops either as soon as loss energy converges or after completion of the maximum number of cycles.Use the Energy Sensor to watch the convergence of the force signal instead. Adams Car calculates the energy error, E, for one motion channel as follows: E(cycle n) = (E(cycle n-1) + 7 * (loss_energy(n) - loss_energy(n-1)) / loss_energy(n)) / 8 If the energy error is less than 2.0e-3, the sensor stops the analysis because the model has converged on a steady-state response.
Measuring Method	Select a method for measuring the loss angle and dynamic stiffness: ■Min-Max-Method - Combines the integral of the hysteresis with the minimum and maximum of the force. For a linear component, the result is usually equal to the fourier method. For a nonlinear component, the result diverges slightly. Learn more about the Min-Max Method. ■Fourier-Method - Is a first-order fourier analysis used to approximate the force signal with a harmonic force function. Learn more about the Fourier Method. See the Force vs Displacement for Linear Damper.
If you select Range of Frequencies, Adams Car displays the following options:
Start	Enter the start frequency.
Incr	Enter the increment between frequencies.
End	Enter the end frequency.
Maximal Cycles	Enter the maximum number of cycles to be performed during one analysis. If you enable the Energy Sensor, the simulation might stop before reaching the maximum number of cycles because the model has reached a steady-state condition.
Steps per Cycle	Enter the desired number of steps per cycle.
Excitation Amplitude	Enter one or a list of amplitude values. Adams Car holds the amplitude constant during one analysis, and during the next analysis it chooses the next frequency in the list. If you enter a list of amplitudes, make sure that you separate each entry by a comma (1.0, 2.0, 3.0, ...).
Phase	Enter the phase of the excitation function. Adams Car applies the phase with an initial step.
Loop over	Select the inner loop of a series of analyses (Amplitude or Frequency). This produces loss angle and dynamic stiffness over amplitude or frequency.
Energy Sensor	The analysis stops either as soon as loss energy converges or after completion of the maximum number of cycles.
Measuring Method	See the explanation for Measuring Method above.
If you select Continuous Sweep, Adams Car displays the following options:
Start	Enter the start frequency.
End	Enter the end frequency.
End Time	Enter the end time for your simulation.
Number of Steps	Enter the total number of steps. Make sure that you have sufficient output steps at the highest frequency so that important output data is not lost (anti-aliasing).
Amplitude	Enter the amplitude of the sine function.
Phase	Enter the phase of the excitation function.
If you select Quasi Static, Adams Car displays the following options: (see example results for a quasi-static test)
End Time	Enter the end time for your simulation.
Number of Steps	Enter the total number of steps. Make sure that you have sufficient output steps at the highest frequency so that important output data is not lost (anti-aliasing).
Amplitude	Enter the amplitude of the SAWTOOTH function.
Velocity	Enter the velocity of the SAWTOOTH function.
Max. Acceleration	Enter the maximum acceleration of the SAWTOOTH function at the reversal point. For example: y-axis: A = 1 mm, Vel = 0.5 mm/sec z-axis: A = 2 mm, Vel = 0.5 mm/sec Maximal acceleration: translational = 1 mm/sec The max. acceleration should satisfy: (vel * vel) / acc < ampl / 4 The excitation function uses the HAVERSIN step to meet the reversal point.
If you select User Function, Adams Car displays the following options:
End Time	Enter the end time for your simulation.
Number of Steps	Enter the total number of steps. Make sure that you have sufficient output steps at the highest frequency so that important output data is not lost (anti-aliasing).
Amplitude	Enter a function expression.
	Select to use the Function or Expression Builder to define a function. For information on the Function or Expression Builder, see Function Builder.
If you select Damper Sweep, Adams Car displays the following options: (See example results for a Damper Sweep test.)
Frequency Alpha Factor	Factor alpha determines the frequency acceleration. The displacement function is used for the GSE Damper Model in the Chirps test: x(time) = A * sin( 4 * PI * time /( 2 * T0 - time )), 0 < time < T/2 = -A * sin( 4 * PI * (T - time) / ( 2 * T0 - T + time)), T/2 < time < T with: ■A = Amplitude ■T = End Time ■T0 = T / ( 4 * ( 1 - 1 / (2**alfa) ) )
End Time	Enter the end time for your simulation.
Number of Steps	Enter the total number of steps.
Amplitude	Enter the amplitude of the sine function.
Other GSE tests are: Bleed: 1 Hz, A = 50 mm Blow-off: 3 Hz, A = 50 mm Compression: 12 Hz, A = 5 mm Friction: damper velocity = 1 - 2 mm/sec.
VDA damper test at the test field:
Test:	max. Damper velocity (mm/sec) - Amplitude (mm)
Friction	2.6 - 10
Gas Force	2.6 - 10
The gas and friction force definition: Gas Force = (Fmax + Fmin) / 2 Friction Force = Fmax - Fmin Forces Fmax and Fmin are measured at middle of max- and min displacement. These tests can be performed with the Excitation function: Set of Frequencies with f = vmax/(2PIA) = 0.04138 Hz. Excitation frequencies for the VDA Velocity Test with Amplitude = 50 mm:
Demand velocity (mm/sec):	Excitation frequency (Hz):
52	0.1655211
131	0.4169860
262	0.8339719
393	1.2509579
524	1.6679438
1047	3.3327045
To get the pure damper forces, the results must be reduced by the gas force.
Keep Files	Select to keep the analysis files on your disk.
	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 more about Recording Comments.
Set Up Test Rig	This button opens the dialog window for setting up the Actuation Type and constraints of the test rig.