VisSim/Analyze 
Bode plot of 11th order Butterworth filter
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Root Locus plot of 11th order Butterworth |
VisSim/Analyze lets you perform a frequency domain analysis of a VisSim
model or subsystem. It helps answer the question "Is this a stable
system?" VisSim/Analyze approximates the dynamics of a nonlinear
system by linearizing the system about a specified operating point. Linearized
systems can be represented in ABCD state space or transfer function form.
With VisSim Analyze, you can easily access transfer function information;
edit zeros and poles; and compute Nyquist, Bode, and root locus plots.
Interactive
Controller Design
Designing a controller for a plant model is performed interactively
by editing compensator zeros and poles, and observing the combined controller-plant
behavior in Bode and root locus plots. Once the desired responses are
obtained, the resulting controller block is simply inserted into a VisSim
diagram.
The preliminary pole placement controller is connected to a plant model
creating a feedforward or a feedback control loop. A simulation is run
in VisSim and the results of the simulation are easily viewed in graphical
plots. The stability of the closed-loop system can then be determined
using Nyquist plots.
Compensator Design
VisSim/Analyze also features a compensator design capability that lets
you interactively design feedback control systems. You edit the poles
and zeros of the compensator transfer function in a floating window.
In return, VisSim/Analyze automatically updates the Bode and root locus
plots of the combined plant-compensator system to reflect the effects
of the pole and zero manipulation. Once you attain the desired response
characteristics, you can place the compensator in the VisSim diagram.
Analysis
of Discrete Transfer Functions
VisSim/Analyze supports analysis of discrete transfer functions. This
lets you effectively handle the most general closed-loop system scenarios
where a plant is modeled as a continuous dynamic system and the controller
is a discrete (sampled data) system suitable for easy implementation
on micro-controller hardware.
Features
- Approximates the dynamics of a nonlinear system by linearizing
the system about a specific operating point
- Generates ABCD state-space
matrix (screen display or .M/.MAT file exportation)
- Performs numerical
perturbation for creating SISO ABCD state-space matrices
- Calculates
transfer function information, including numerator and denominator
polynomials in the powers of the s-plane; gain, zeros, and poles locator;
and cleansing of numerical round-off errors
- Computes Bode phase and
magnitude plots, root locus plots, and Nyquist plots
- Provides interactive
compensator design
- Analyzes discrete transfer function
- Generates gain and phase margin
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