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Complex modes are converted into equivalent real modes through reduction transformation.
The modal data from the system identification procedure was utilized in updating the finite element model.
This paper presents a method for improving model-updating methods used for the real-time optimization (RTO) of plant operations.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Loh ; Yingjun Zhao ; Valeria La Saponara, et al." Operational model updating of spinning finite element models for HAWT blades ", Proc.
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A cyclo-stationary stochastic-based eigensystem realization algorithm (ERA) is applied to operational turbine data to identify data-driven modal properties including frequencies and mode shapes.
Model-driven modal properties are derived through modal condensation of spinning finite element models with variable physical parameters.
The benefit comes from the ease of use and data handling, and computation speed.
The use of FRFs would be mandatory in case target modal parameters are not available or cannot extracted from the FRFs with confidence.
For example, when the structure exhibits high non-proportional damping, high modal density, or nonlinear behaviour.