SI Estimate ARMAX Model VI
Owning Palette: Polynomial Model Estimation VIs
Installed With: System Identification Toolkit
Estimates the parameters of an ARMAX model for an unknown system. Wire data to the stimulus signal and response signal inputs to determine the polymorphic instance to use or manually select the instance.
The success of the model estimation depends on the correct selection of the orders of ARMAX model input.
Use the pull-down menu to select an instance of this VI.
 Place on the block diagram | Find on the Functions palette |
SI Estimate ARMAX Model (SISO Waveform)
 | stimulus signal specifies the input waveform of the stimulus signal. | ||||||||
| response signal is the input waveform of the response signal. The length of response signal must be greater than [max(A order, B order + (delay – 1), C order) + (A order + B order + C order)]. | ||||||||
 | orders of ARMAX model specifies the orders and delay of the ARMAX model.
| ||||||||
 | 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.
| ||||||||
 | 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.
| ||||||||
| coefficients of ARMAX model returns the coefficients of the ARMAX model.
| ||||||||
 | noise returns the disturbance e(t) in the estimated system 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.
|
SI Estimate ARMAX Model (SISO Array)
 | stimulus signal specifies the input array of the stimulus signal. | ||||||||
| response signal is the input array of the response signal. The length of response signal must be greater than [max(A order, B order + (delay – 1), C order) + (A order + B order + C order)]. | ||||||||
| orders of ARMAX model specifies the orders and delay of the ARMAX model.
| ||||||||
| 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.
| ||||||||
 | sampling rate specifies the sampling frequency in hertz. The value of sampling rate must be greater than 0. The default is 1. | ||||||||
| 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.
| ||||||||
| coefficients of ARMAX model returns the coefficients of the ARMAX model.
| ||||||||
| noise returns the disturbance e(t) in the estimated system 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.
|
SI Estimate ARMAX Model (MISO Waveform)
 | stimulus signals specifies the input waveform array of the stimulus signals. Each element of the array is the waveform of one stimulus signal. | ||||||||
| response signal is the input waveform of the response signal. The length of response signal must be greater than [max(A order, max(B orders + (delays – 1)), C order) + (A order + sum(B orders) + C order)]. | ||||||||
 | orders of ARMAX model specifies the orders and delay of the ARMAX model.
| ||||||||
| 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.
| ||||||||
| 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.
| ||||||||
| coefficients of ARMAX model returns the coefficients of the ARMAX model.
| ||||||||
| noise returns the disturbance e(t) in the estimated system 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.
|
SI Estimate ARMAX Model (MISO Array)
 | stimulus signals specifies the input array of the stimulus signals. Each row in the array is one stimulus signal. | ||||||||
| response signal is the input array of the response signal. The length of response signal must be greater than [max(A order, max(B orders + (delays – 1)), C order) + (A order + sum(B orders) + C order)]. | ||||||||
| orders of ARMAX model specifies the orders and delay of the ARMAX model.
| ||||||||
| 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.
| ||||||||
| sampling rate specifies the sampling frequency in hertz. The value of sampling rate must be greater than 0. The default is 1. | ||||||||
| 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.
| ||||||||
| coefficients of ARMAX model returns the coefficients of the ARMAX model.
| ||||||||
| noise returns the disturbance e(t) in the estimated system 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.
|
Example
Refer to the Estimate Polynomial Models VI in the labview\examples\System Identification\Getting Started\Parametric Estimation.llb for an example of using the SI Estimate ARMAX Model VI.
Open example Browse related examples