CL Second Order Low Pass Filter
| Owning Palette: | Continuous |
| Requirements: | Quanser Rapid Control Prototyping Toolkit, LabVIEW 2020 or newer, Control Design and Simulation Module |
Description
Models, in the continuous-time domain, a second-order low-pass filter characterized by a cut-off frequency and a damping ratio.
Recommended Inputs or Dialog Box Options 
Recommended inputs need not to be wired. They may be selected to appear as terminals or dialog parameters, but show up as terminals by default.
They appear in simple text in the context help window for the VI.
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x is the input signal to the second-order low-pass filter. |
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cut-off frequency is the cut-off frequency (in radians per second, i.e., rad/s) of the second-order low-pass filter. |
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damping ratio is the damping ratio of the second-order low-pass filter. |
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x0 is the input signal initial condition to the second-order low-pass filter. |
Outputs
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y is the (filtered) output signal from the second-order low-pass filter. |
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yd is the time-derivative of the output signal from the second-order low-pass filter. |
Details
The CL Second Order Low Pass Filter VI models, in the continuous-time domain, a second-order low-pass filter characterized by a cut-off frequency and a damping ratio. The filtered output is always continuous even after any parameter change (e.g., cut-off frequency and/or damping ratio).
The block diagram for this VI is shown below:
where ωn is the cut-off frequency and ζ is the damping ratio.
When using the CL Second Order Low Pass Filter VI, ensure the Simulation Parameters of the
Control & Simulation Loop are set correctly for proper time step integration.
Specifically, the chosen Initial Step Size (s) should be fast enough for the desired
ODE Solver method.
Furthermore, the Initial Step Size (s) should be also chosen so that it can accommodate the
cut-off frequency (or range of cut-off frequency values) to be used by the VI.
Feedthrough Behaviour
All input/output pairs of this function have direct feedthrough behaviour.
Examples
| RCP CL Second Order Low Pass Filter Example |
See Also
| CL Discrete Second Order Low Pass Filter | Models, in the discrete-time domain, a second-order low-pass filter characterized by a cut-off frequency and a damping ratio. |
Targets
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Target |
Supported |
Comments |
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Yes |
Fully supported. |
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