s it possible to use the matlab system identification toolbox to conduct dam modal analysis based on strong earthquake records? ARX or ARMAX is adopted.

I want to use the system identification toolbox to implement multi-input and single-output ARX or ARMAX algorithm to realize the dam mode analysis based on strong earthquake records. I wonder if it can be achieved? I'm a beginner.Is there a tutorial or example that I can follow?

Answer 1

[Sanju]

Hi lLongjiang,

I understand that you want to use System Identification Toolbox to implement ARX or ARMAX algorithm.

Yes, it is possible to use the System Identification Toolbox in MATLAB to implement the ARX or ARMAX algorithm for dam mode analysis based on strong earthquake records. The System Identification Toolbox provides functions and tools for modelling and analysing dynamic systems from measured input-output data.

To implement a MISO system identification, you refer to the following code,

%Load or create the input-output data: 
load earthquake_data.mat 
data = iddata(y, u, Ts); 

%Estimate the MISO model using the appropriate algorithm (e.g., ARX, ARMAX, etc.): 
model = arx(data, [na nb nk]); 

%Analyze and validate the estimated model:  
compare(data, model); 

%Simulate the MISO model: 
sim_data = sim(model, data); 

The above is the generalized procedure for implementing a MISO system identification in MATLAB using the System Identification Toolbox, where “y” represents the output data, “u” represents the input data, “Ts” is the sample time, “na” represents the order of past output terms ,“nb” represents the order of past input terms for each input channel and “nk” represents the Input delay for each input channel.

You can also refer to the following documentation links for more information,

System Identification toolbox: https://www.mathworks.com/help/ident/

https://www.mathworks.com/videos/introduction-to-system-identification-toolbox-68901.html

ARX: https://www.mathworks.com/help/ident/ref/arx.html

ARMAX: https://www.mathworks.com/help/ident/ref/armax.html

AIC: https://www.mathworks.com/help/ident/ref/idmodel.aic.html

Hope this helps!