Hello Rashad,

To find the best parameter values, you will need to make some changes to the way you defined the analysis in quoFEM:

1) In order to find the best value of the parameters of your model, you should use the 'Parameters Estimation' method category in the ‘UQ’ panel of quoFEM, under the ‘Dakota’ UQ Engine. You also need to provide data, which are target values of the output of the model. These target values could be, for example, measurements of the output quantity of interest from experiments. Then, quoFEM will find the best values of the parameters that makes the model output match the target values of the output as well as possible.

The data for parameter estimation must be provided in a text file which should satisfy the following requirements:

•Each row contains data from one experiment

•The number of data in each row must equal the sum of the length of all response quantities defined in the QoI panel

•The order of the response quantities must match in the QoI panel, the calibration data file, and results file from analyses

So, you should provide the target value of the output Node_16_Disp_1 in a text file and provide the path to this file as input to the parameter estimation method in the UQ panel. (Refer attached figure of the UQ panel)

2) The parameter estimation method uses optimization algorithms to find the best value of the parameters, given the target value of the outputs of the model. Here, ‘the best value’ means ‘that value of the input parameters which minimizes the sum of the squared error between the outputs of the model and the data’. You will need to define the lower and upper bounds on the parameter values and the initial point for the optimization algorithm in the RV panel. (Refer attached figure of the RV panel)

3) Upon completion of the analysis, the 'best parameter' values will be displayed in the RES panel. (Refer attached figure of the RES panel)