Hi, everybody. I am new to UQlab and trying to find a solution to my problem. I want to use the PCE module to call a FEM model (Matlab file) for reliability analysis. As I know, if there is no need to call other models, this reliability analysis is very easy to solve. As shown in Example, " ModelO…

Hi @Qiang_Zhang , welcome to UQWorld! :slight_smile: To learn how to define a model in UQLab, have a look at this example and the UQLab model manual , specifically sections 2.2 and 2.1.1. Do you want to define a uq_model for your FEM code or for the limit state function? for the FEM model: Since …

Hi @Qiang_Zhang , By the way, if your main goal is to conduct a reliability analysis using a metamodel, to complement @nluethen ’s suggestion above, you might also want to consider using the metamodel-based method for reliability analysis in UQLab. The metamodel used is not, strictly speaking, a PCE …

Hi! Thank you very much. But this example is very sample. I want to call the finite element model (uq_truss_model) and define the limit state function for reliability analysis. Can you give me an example? The above response to Dr. Nora’s example. @nluethen Thank you very much. Best wishes, QZ

Dear Qiang_Zhang If you want to use a third party code such as a finite element code, you should use the UQLink module of UQLab (see manual here ). It allows you to link easily your external code with UQLab. The UQLink module comes with several examples including one with Abaqus and one with OpenSe…

Hi @Qiang_Zhang , In response to your earlier questions: The purpose of UQLab is to analyze computational models. (Almost) everything in UQLab is based on models. Therefore, the first step is usually to construct the computational model in UQLab (and the corresponding probabilistic input). Here is …

Thank you very much. I‘m using this method for reliability analysis. But, when it comes to evaluate the full model on the current experimental design(uq_evalModel(myModel,X_ED)), program error “Experimental design dimension error : size(X,1) = 50 ,size(Y,1) = 1”. I’m very puzzled, it should be calc…

Great that you were able to figure it out! What dimension does the output of the Truss-function have? UQLab assumes that the data points in the experimental design matrix X are arranged in rows, i.e. each row is one data point. Correspondingly, it expects the output to be a column vector. Is this fu…

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Reliabaility analysis with PCE:How to call the Matlab model and defined the implicit performance function

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