Finite element model updating
Direct, noniterative methods update the FE model properties in one-step procedure .
The methods based on sensitivity of the parameters solve the optimization problem in an iterative procedure.
The main goal of the conducted research is to validate finite element model of the modified wind turbine blade section mounted in the flexible support structure accordingly to the experimental results.
Bend-twist coupling was implemented by adding angled unidirectional layers on the suction and pressure side of the blade.
Blade section is mounted in the two root clamps (Figure 1). The two shells form the suction and pressure side of the blade.
To join the two shells together the structural web is incorporated.
Sudden wind gusts are often too quick for the active pitch control system to react and may shorten the fatigue life substantially.
The coupling causes the feathering blade to twist under the bending load and as a result decreases the angle of attack.Based on sensitivity analysis, set of model parameters was selected for the model updating process.Design of experiment and response surface method was implemented to find values of model parameters yielding results closest to the experimental.In  an overview of the statistical and modal analysis experiments on the original and modified blade section is presented.In this paper the updating of the modified wind turbine blade section’s finite element model using experimental modal analysis is presented.