Abstract. To increase the contribution of offshore wind energy to global mix in an economically sustainable manner, it is required reduce costs associated with production and operation turbines (OWTs). One largest uncertainties sources conservatism design lifetime prediction for OWTs determination damping level OWT. Estimation OWT based on field measurement data has hence been subject considera...

The purpose of this paper is to estimate hydroelectric turbine runner modal characteristics from experimental measurements coming asynchronous regimes. This achieved by investigating resonances generated the interaction a structural mode with harmonics rotating speed. Resonances are extracted using order tracking and processed Fast Bayesian algorithm in an ambient manner parameters related unce...

Close modes are much more difficult to identify than well-separated and their identification (ID) results often have significantly larger uncertainty or variability. The situation becomes even challenging in operational modal analysis (OMA), which is currently the most economically viable means for obtaining in-situ dynamic properties of large civil structures where ID management needed. To und...

This work takes up the challenge of deriving ‘uncertainty law’ for close modes, i.e., closed form analytical expressions remaining uncertainty modal parameters identified using (output-only) ambient vibration data. In principle law can be obtained from inverse Fisher information matrix parameters. The key mathematical challenges stem treatment entangled stochastic dynamics with a large number d...

Experimental dynamic characterization of a wind turbine, operating under variety of conditions, is a desired task as it provides useful insights that can be used for number of tasks including design optimization, validation and verification of aeroelastic and finite element codes and development of an optimal control system. However, current state of art experimental techniques are insufficient...