CD Construct Special TF Model VI

Owning Palette: Model Construction VIs

Requires: Control Design and Simulation Module

Creates commonly used transfer function models. You must manually select the polymorphic instance to use.

The first order instance generates a transfer function with the following equation:

where K is the gain and t is the time constant.

Details  

CD Construct Special TF Model (1st Order)

	Static Gain specifies the DC gain of the system, which is the gain when the frequency is 0. The default value is 1.
	Time Constant (s) specifies the system time constant, or the time required for the output to reach 63% of its final response. The default is 0.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Delay is the delay this VI uses to construct the special model. The default is NaN. Refer to the LabVIEW Control Design User Manual for more information about delays.
	Transfer Function Model returns the transfer function this VI constructs based on the inputs. To access and modify the data in the model, use the Model Information VIs.
	error out contains error information. This output provides standard error out functionality.

CD Construct Special TF Model (2nd Order)

The second order instance generates a transfer function with the following equation:

where K is the steady-state value of the response in the case of a unit step input, w_n is the natural frequency, and z is the damping ratio.

	Static Gain specifies the DC gain of the system, which is the gain when the frequency is 0. The default value is 1.
	Damping Ratio specifies the damping ratio, which reflects the damping level as a fraction of the critical damping value where the poles become real, of the second-order transfer function model. The default is zero.
	Natural Frequency (rad/s) specifies the natural frequency, in radians/seconds, of the second-order transfer function model. The default is zero.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Delay is the delay this VI uses to construct the special model. The default is NaN. Refer to the LabVIEW Control Design User Manual for more information about delays.
	Transfer Function Model returns the transfer function this VI constructs based on the inputs. To access and modify the data in the model, use the Model Information VIs.
	error out contains error information. This output provides standard error out functionality.

CD Construct Special TF Model (Delay Pade Approximation)

Delay refers to a continuous time value in which the Pade polynomial approximates behavior.

	Delay specifies the transport time delay that you want to use to create a transfer function using Pade approximation. The default is 0.
	Polynomial Order specifies the order of this polynomial approximation. The default is 3.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Model with Delay returns the transfer function model with delays this VI incorporates. To access and modify the data in the model, use the Model Information VIs.
	error out contains error information. This output provides standard error out functionality.

CD Construct Special TF Model Details

This VI supports delays. To represent a delay in the model, you must specify the delay in this VI. Refer to the LabVIEW Control Design User Manual for more information about delays.