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Coupled aero-hydro-structural modes with QBlade?
Hi everyone,
As I only have access to the free version of QBlade for now, I wasn’t able to test the modal analysis. I’d like to know whether it calculates structural modes only, or whether it’s possible to calculate modes coupled with hydrodynamics models (i.e. including added mass effects, etc.) and/or aerodynamics models (including e.g. linearization of aerodynamic forces around an operating point).
Thank you in advance and congratulations on this promising software.
Cheers
Hi,
the modal analysis works by linearizing the turbine dynamics around a certain operational point (e.g. around a single timestep from a simulation).
This linearization is performed for all structural DoF, but also for the aerodynamic forces/moments and hydrodynamic forces/moments, including added mass.
A Campbell diagram is then generated in QBlade by running a batch of simulations for each operational point of interest with automated mode tracking.
BR,
David
Very interesting, thank you! Is it then possible to extract the resulting coupled state-space matrices for further processing ?
Hello,
this currently is not a feature of QBlade.
While in general it is quite straigtforward to “dump” the complete linearized system matrices (structural + external loads) this results in a very large set of matrices(M, C, K, Forces + Lagrangian Constraint Forces), in which the DoF’s would be quite unsorted. I would expect this data to be very challenging to work with.
BR,
David
