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Blade structural analysis
Hello everyone,
Is it possible that the feature of ‘Blade structural analysis’ is not present anymore in the current version of the program? They used it in this video (https://www.youtube.com/watch?v=lLPja2_9YUY&list=PLcu34l7xaPqbP_DZcQosaaXqmGWIk0Gux&index=5), but I cannot find it anymore (for VAWTs) …
Kind regards,
Brecht
Hi Brecht,
the feature you are talking about (QFEM) is still there, but only works in HAWT mode. However, if your purpose is only to obtain relevant strucural section properties you can also generate them with QFEM in HAWT mode and then use these properties for the structural blade file of a VAWT blade design.
Best,
David
Dear Dr. Marten
Recently, I have read your great article entitled “Development and validation of a modal analysis code for wind turbine blades”, 2014. This article is interesting and I want to simulate one of its models in Qblade software. When I simulate isotropic cantilevered hollow blade in Qblade software, the natural frequency of the first flapwise and edgewise mode are approximately similar to the article’s results, but other natural frequencies are not the same. I would be grateful if you can explain why this problem happens.
Best regards
Hello sima,
did you setup the structural model according to Table 3 (properties and foil shape) of the publication you mention?
Also, I think the frequencies that are presented in Table 4 are not “sorted” into edgewise, flapwise, etc – but rather sorted after their frequency – so maybe you find some results in the “Torsional”, or “Unsorted” catergory that match the results from Table 4.
BR,
David
Hello,
First, I’d like to thank you for your help.
As a newcomer to software, I’d just used the properties of Table 2.
Unfortunately, I could not find any tutorial about modal analysis simulation in the software, and may be I have some mistakes.
I would appreciate any help. Thank you for your assistance.
Best regards
Hi,
I think to obtain the shown values its important to assign the colrrect thickness to the hollow blade section. Upon a quick glance I couldn’t find those values in Ricardo de Frias Thesis, but you could play around with the shell thickness until you match the aggregated properties in Table 4.3 of M. Lennies Thesis.
BR,
David
Hello,
Thank you very much for your help.
Also I would be grateful if you can introduce a comprehensive tutorial for Qblade software.
Best regards
