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Bode Plots

Plot → Bode Plots
Creates a Bode plot in Adams PostProcessor. Bode plots provide a way to study frequency response functions (FRFs) for linear systems and linearized representations of nonlinear systems. The frequency response function measures the response at the outputs due to unit harmonic excitation at the inputs at various frequencies. A Bode plot in Adams PostProcessor shows the amplitude gain and the phase shift between input to output for all output/input combinations of the linear system.
 
For the option:
Do the following:
Input Format
Select the type of input format.
The elements in the dialog box change depending on the input format you selected. You can select any one of the following input formats:
■TFSISO
Adams Linear State Matrices
Enter values for the following:
■The frequency sweep by entering the starting and ending frequencies for the bode plot in the From and To text boxes and selecting the frequency step (either Linear Samples, Log Samples, or Step Size).
■In the State Matrices text box, the state matrices.
■In the Inputs and Outputs text boxes, the input and output results you would like to use for bode plot calculations. If you do not select any inputs or outputs, Adams PostProcessor computes all combinations.
Adams Matrices
Enter values for the following:
■The frequency sweep by entering the starting and ending frequencies for the bode plot in the From and To text boxes and selecting the frequency step (either Linear Samples, Log Samples, or Step Size).
■In the A through D Matrix text boxes, the A through D matrices that define the state matrix.
■In the Inputs and Outputs text boxes, the input and output results you would like to use for bode plot calculations. If you do not select any inputs or outputs, Adams PostProcessor computes all combinations.
Linear State Equation
Enter values for the following:
■The frequency sweep by entering the starting and ending frequencies for the bode plot in the From and To text boxes and selecting the frequency step (either Linear Samples, Log Samples, or Step Size).
■In the Linear State Equation text box, the linear state equation to be plotted.
■In the Inputs and Outputs text boxes, the input and output results you would like to use for bode plot calculations. If you do not select any inputs or outputs, Adams PostProcessor computes all combinations.
TFSISO
Enter values for the following:
■The frequency sweep by entering the starting and ending frequencies for the bode plot in the From and To text boxes and selecting the frequency step (either Linear Samples, Log Samples, or Step Size).
■In the TFSISO text box, the transfer function to be plotted.
Transfer Function Coefficients
Enter values for the following:
■The frequency sweep by entering the starting and ending frequencies for the Bode plot in the From and To text boxes and selecting the frequency step (either Linear Samples, Log Samples, or Step Size).
■In the Numerator Coefficients text box, the coefficients of the transfer function numerator polynomial.
■In the Denominator Coefficients text box, the coefficients of the transfer function denominator polynomial.
Time Domain Measures
Enter values for the following:
■In the Input Measure text box, the pre-defined or user-defined measure of the system input.
■In the Output Measure text box, the pre-defined or user-defined measure of the system output.
Note that the data determines the frequency range, unlike the previous options.
Time Domain Results Set Components
Enter values for the following:
■In the Input Component text box, the results set component characterizing system input.
■In the Output Component text box, the results set component characterizing system output.
Note that the data determines the frequency range, unlike the previous options.