FE model calibration
The three-dimensional response characteristics used by WH Monitoring can be used to calculate the stresses in three dimensions at the measurement point using Hook’s Law with appropriate Poisson’s coefficient. The stress calculation approach adopted by WH Monitroing provides with a full picture of structural response in three-dimensions which cannot be obtained with traditional measurement and post-processing methods. This data can be presented as:
• Stress-strain vectors;
• Plots showing response, kinetic and potential energy;
• Tabulated or graphical stress-strain amplitudes for different excitation frequencies;
• Three-dimensional stress-strain mesh models, similar to those produced by FE software.
This approach is very efficient for both predictive maintenance and calibration of the FE models against real measurements. By comparing frequency-domain dynamic response against measurements, the FE model can be verified and if necessary calibrated by adjusting critical damping or stiffness properties to match the actual response.
WH Monitoring is also developing a method of calculation stresses in time-domain for structural response to be visualised in real-time and shown as mesh-model with varying stress-strain at each time-step based on the real measurement data. This philosophy is similar to FE software, however the results are based on real measurement data.