With two more lectures now my educational program has ended. Over 1000 pages have been written in English language. It is now in the responsibility of others to make use of this high-level know-how, collected from 35 years of good and bad experience with hundreds of wind turbines. The biggest milestone is finished.
To my regret I have to state that the general know-how in the wind turbine industry has gone down. A well reputed British consultancy gave wrong rules to dimension the yaw system. Costly defects are the result, based on 3P cyclic hard-hits on the drives due to neglecting their play in the calculations. I have handled this problem already 1993.
And an also well-reputed company for pitch slewing ring bearings calculated FEM without the essential blade ovalisation effects. But these contribute a lot to premature damage of such a bearing. And they based their fatigue on ISO-281, which is irrelevant for the load state.
Evident loss of knowledge among companies and suppliers in the branch is being replaced by empty phrases such as "best practice" and "lean supply chain management" etc. This shall cover the simple fact that wind power has become a large-scale political poker-game of energy giants.
There has been a claim from one company against an other (I cannot tell details openly) in which I was involved by giving a neutral statement. To my surprise I noticed that a well-reputed company had given pure fantasy and lies as their statements.
In June I will be busy in Finland and Germany. Some bureaucratic affairs need my attention.