SI Estimate Partially Known Continuous Transfer Function Model VI

System Identification VIs

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SI Estimate Partially Known Continuous Transfer Function Model VI

Owning Palette: Partially Known Model Estimation VIs

Installed With: System Identification Toolkit

Estimates a continuous transfer function model for a partially known system. Use the SI Create Partially Known Continuous Transfer Function Model VI to create the model you want to estimate. You must manually select the polymorphic instance to use.

Details  Examples

Use the pull-down menu to select an instance of this VI.

 Place on the block diagram  Find on the Functions palette

SI Estimate Partially Known Continuous Transfer Function Model (1st Order SISO Waveform)

system model in contains information for the mathematical model of a partially known system. The information includes the model type, model orders, constraints on each of the model coefficients, input and output names of the system, and so on.
stimulus signal specifies the input waveform of the stimulus signal.
response signal specifies the input waveform of the response signal.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
static gain returns the static gain of the model.
system model out returns information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model out contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
coefficients of transfer function model returns the coefficients of the transfer function model.
numerator returns the numerator coefficients of the transfer function model, in ascending order. The coefficients take the following form: b0 + b1s + … + bmsm.
denominator returns the denominator coefficients of the transfer function model, in ascending order. The coefficients take the following form: a0 + a1s + … + ansn.
delay (s) returns the estimated delay, in seconds, of the model.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
Tp (s) returns the estimated time constant, in seconds, of the model.

SI Estimate Partially Known Continuous Transfer Function Model (1st Order SISO Array)

system model in contains information for the mathematical model of a partially known system. The information includes the model type, model orders, constraints on each of the model coefficients, input and output names of the system, and so on.
stimulus signal specifies the input array of the stimulus signal.
response signal specifies the input array of the response signal.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
sampling rate specifies the sampling frequency in hertz. sampling rate is used when this VI converts the continuous system to a discrete system before simulating the output.
static gain returns the static gain of the model.
system model out returns information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model out contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
coefficients of transfer function model returns the coefficients of the transfer function model.
numerator returns the numerator coefficients of the transfer function model, in ascending order. The coefficients take the following form: b0 + b1s + … + bmsm.
denominator returns the denominator coefficients of the transfer function model, in ascending order. The coefficients take the following form: a0 + a1s + … + ansn.
delay (s) returns the estimated delay, in seconds, of the model.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
Tp (s) returns the estimated time constant, in seconds, of the model.

SI Estimate Partially Known Continuous Transfer Function Model (2nd Order SISO Waveform)

system model in contains information for the mathematical model of a partially known system. The information includes the model type, model orders, constraints on each of the model coefficients, input and output names of the system, and so on.
stimulus signal specifies the input waveform of the stimulus signal.
response signal specifies the input waveform of the response signal.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
static gain returns the static gain of the model.
system model out returns information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model out contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
coefficients of transfer function model returns the coefficients of the transfer function model.
numerator returns the numerator coefficients of the transfer function model, in ascending order. The coefficients take the following form: b0 + b1s + … + bmsm.
denominator returns the denominator coefficients of the transfer function model, in ascending order. The coefficients take the following form: a0 + a1s + … + ansn.
delay (s) returns the estimated delay, in seconds, of the model.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
natural freq (rad/s) & damping ratio returns the estimated natural frequency and damping ratio of the model.
natural freq (rad/s) returns the estimated natural frequency, in radians per second, of the model.
damping ratio returns the estimated damping ratio of the model.

SI Estimate Partially Known Continuous Transfer Function Model (2nd Order SISO Array)

system model in contains information for the mathematical model of a partially known system. The information includes the model type, model orders, constraints on each of the model coefficients, input and output names of the system, and so on.
stimulus signal specifies the input array of the stimulus signal.
response signal specifies the input array of the response signal.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
sampling rate specifies the sampling frequency in hertz. sampling rate is used when this VI converts the continuous system to a discrete system before simulating the output.
static gain returns the static gain of the model.
system model out returns information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model out contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
coefficients of transfer function model returns the coefficients of the transfer function model.
numerator returns the numerator coefficients of the transfer function model, in ascending order. The coefficients take the following form: b0 + b1s + … + bmsm.
denominator returns the denominator coefficients of the transfer function model, in ascending order. The coefficients take the following form: a0 + a1s + … + ansn.
delay (s) returns the estimated delay, in seconds, of the model.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
natural freq (rad/s) & damping ratio returns the estimated natural frequency and damping ratio of the model.
natural freq (rad/s) returns the estimated natural frequency, in radians per second, of the model.
damping ratio returns the estimated damping ratio of the model.

SI Estimate Partially Known Continuous Transfer Function Model (General SISO Waveform)

system model in contains information for the mathematical model of a partially known system. The information includes the model type, model orders, constraints on each of the model coefficients, input and output names of the system, and so on.
stimulus signal specifies the input waveform of the stimulus signal.
response signal specifies the input waveform of the response signal.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
static gain returns the static gain of the model.
system model out returns information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model out contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
coefficients of transfer function model returns the coefficients of the transfer function model.
numerator returns the numerator coefficients of the transfer function model, in ascending order. The coefficients take the following form: b0 + b1s + … + bmsm.
denominator returns the denominator coefficients of the transfer function model, in ascending order. The coefficients take the following form: a0 + a1s + … + ansn.
delay (s) returns the estimated delay, in seconds, of the model.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
den info returns the estimated denominator of the model.
Tp (s) returns the estimated time constant of the model in seconds.
natural freq (rad/s) & damping ratio returns the estimated natural frequency and damping ratio of the model.
natural freq (rad/s) returns the estimated natural frequency, in radians per second, of the model.
damping ratio returns the estimated damping ratio of the model.

SI Estimate Partially Known Continuous Transfer Function Model (General SISO Array)

system model in contains information for the mathematical model of a partially known system. The information includes the model type, model orders, constraints on each of the model coefficients, input and output names of the system, and so on.
stimulus signal specifies the input array of the stimulus signal.
response signal specifies the input array of the response signal.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
sampling rate specifies the sampling frequency in hertz. sampling rate is used when this VI converts the continuous system to a discrete system before simulating the output.
static gain returns the static gain of the model.
system model out returns information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model out contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
coefficients of transfer function model returns the coefficients of the transfer function model.
numerator returns the numerator coefficients of the transfer function model, in ascending order. The coefficients take the following form: b0 + b1s + … + bmsm.
denominator returns the denominator coefficients of the transfer function model, in ascending order. The coefficients take the following form: a0 + a1s + … + ansn.
delay (s) returns the estimated delay, in seconds, of the model.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.
den info returns the estimated denominator of the model.
Tp (s) returns the estimated time constant of the model in seconds.
natural freq (rad/s) & damping ratio returns the estimated natural frequency and damping ratio of the model.
natural freq (rad/s) returns the estimated natural frequency, in radians per second, of the model.
damping ratio returns the estimated damping ratio of the model.

SI Estimate Partially Known Continuous Transfer Function Model Details

When estimating continuous transfer function models from array data, you must set the sampling rate for this VI to convert continuous systems to discrete systems. This VI then simulates the output and compares the simulated output with the response signal to optimize estimation.

Examples

Refer to the following VIs for examples of using the SI Estimate Partially Known Continuous Transfer Function Model VI:

  • Continuous Transfer Function Model of a DC Motor with Known Gain VI: labview\examples\System Identification\Getting Started\Grey-Box Model.llb

     Open example  Browse related examples

  • Ball and Beam VI: labview\examples\System Identification\Industry Applications\Mechanical Systems.llb

     Open example  Browse related examples

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