Wikipedia:Articles for deletion/Vibration of rotating structures
The subject is notable and has certainly been the subject of many articles and books. However, the content of the article is pure original research, as the WP article and the two sources have the same author. Moreover none source is reliable, as one is a presentation at a forum, and the title of the other (in German) is not known by Google Scholar. Moreover, nothing in the article can be useful for making an article on this subject. This is clearly a case for 
— User:D, 17:59, 16 May 2019 (UTC)
Stance: delete
Cited policy: WP:TNT (Wikipedia:Blow it up and start over)