Experimental set-up of the Double Slip Joint - Investigating the settling behaviour
Master thesis
Permanent lenke
http://hdl.handle.net/11250/2614984Utgivelsesdato
2015Metadata
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- Institutt for marin teknikk [3472]
Sammendrag
The Double Slip Joint (DSJ) is a new design to connect the transition piece to thefoundation pile of an oshore wind turbine. It potentially oers high dynamic strengthand reliability at a lower cost thereby assisting the decrease in cost of wind energy. Thedesign is based on a self-locking principle through vertical settlement of the joint.The objective is to investigate the settlement behaviour of the DSJ through an experi-mental set-up. Three experiments including multiple tests were conducted. Experimentalresults have been compared with results from a nite element model in Ansys.The self-locking behaviour of the DSJ under various loading congurations including irreg-ular environmental loading is conrmed. The DSJ settles through downward slip motionsin the direction of the loading. Settlement depth increases when horizontal/vertical loadsexceed previous applied loads or when their direction is changed 180 degrees. As the TPvertically settles the joint becomes stronger and more slip resistant. Slip will reduce tozero for sucient settlement. The conducted experiments led to a better understanding ofthe settlement behaviour and provided a benchmark data for validation of nite elementmodels of this process.First the reader is introduced into the subject, the project denition and the approachis presented. Next, an explanation of the experimental set-up is given. Afterwards itis described how the scale model was designed and fabricated. The loading strategy isexplained for three experiments. Then, the measured parameters and the data acquisitionsystem is presented. The methods used to process the data is discussed. The mostinteresting results are presented in combination with a discussion and interpretation.Conclusions are made and lastly recommendations for improvement of the set-up, furthertesting and general development of the DSJ are given.