Simulink Control Design™ - MathWorks

(Tuis.) #1

Tustin (bilinear)


Bilinear (Tustin) approximation without frequency prewarping. The software rounds
off fractional time delays to the nearest multiple of the sampling time. For more
information, see “Tustin Approximation” (Control System Toolbox).

This method usually performs better in the frequency domain.

Tustin with Prewarping


Bilinear (Tustin) approximation with frequency prewarping. Also specify the prewarp
frequency in Prewarp frequency (rad/s). For more information, see “Tustin
Approximation” (Control System Toolbox).

This method usually performs better in the frequency domain. Use this method to
ensure matching at frequency region of interest.

Upsampling when possible, Zero-Order Hold otherwise


Upsample a discrete-time system when possible and use Zero-Order Hold
otherwise.

You can upsample only when you convert a discrete-time system to a new faster
sample time that is an integer multiple of the sample time of the original system.

Upsampling when possible, Tustin otherwise


Upsample a discrete-time system when possible and use Tustin (bilinear)
otherwise.

You can upsample only when you convert a discrete-time system to a new faster
sample time that is an integer multiple of the sample time of the original system.

Upsampling when possible, Tustin with Prewarping otherwise


Upsample a discrete-time system when possible and use Tustin with Prewarping
otherwise. Also, specify the prewarp frequency in Prewarp frequency (rad/s).

You can upsample only when you convert a discrete-time system to a new faster
sample time that is an integer multiple of the sample time of the original system.

Dependencies


Selecting either:



  • Tustin with Prewarping

  • Upsampling when possible, Tustin with Prewarping otherwise


Bode Plot
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