## 1 Introduction
At Kyushu University, three platform designs for a 1/100 scaled model 2 MW wind turbine was tested without any aerodynamic loading in 2009 [8]. The experimental results were compared to the numerical predictions where potential theory and Morison's equation was used. These results showed that one of the designs, a stepped cylindrical shaped platform, was promising. This led to larger 1/22.5 scaled model of the stepped cylindrical shaped platform which was tested in the deep-sea wave basin at National Maritime Research Institute in 2009 [9]. To simulate the aerodynamic loading from the rotor a steady horizontal force was applied by a constant weight on a pulley. The experimental results showed good agreement with the numerical simulations and no unexpected phenomenon was observed. A 1/10 scaled model of the stepped cylindrical shaped platform was deployed at sea in 2010 [10]. The feasibility of the hybrid-spar concept was confirmed through the study which lead to a half-scale prototype in 2011 [11] and full-scale prototype in 2013 which was also installed and tested at sea. The numerical simulations during power production showed good agreement and both prototypes even survived several severe typhoons [12]. At the University of California, Berkeley a feasibility study of the triangular semi-submersible platform Windfloat was conducted in 2010 [13]. This were done by using a 1/100 scaled platform for a 5 MW wind turbine. The platform was tested in a wave basin. The aerodynamic thrust and the gyroscopic force were simulated by an actuator disk and a scaled spinning mass respectively. The spar platform concept from HyWind was tested at Marintek in 2005 on a 1/47 scaled model of a 5 MW wind turbine [14; 15]. The tests were done in combined wind and wave conditions. The rotor was Froude scaled and its speed was set by a dc-motor which was controlled to obtain the right power. The collective blade pitch was controlled by another DC-motor. At the technical university of Denmark,a 1/60 model of the 10 MW DTU reference wind turbine mounted on a TLP platform was tested in 2015 [16; 17]. The tests were done in scaled wind and wave conditions, with a Froude scaled rotor. A later study used a redesigned rotor, which was designed to match the scaled rotor thrust [18]. A later study in 2017 used a new platform, which was, the triple spar platform, which is a hybrid between a spar buoy and a semi-submersible tri-floated concept which had been developed at DTU. The scaled model was tested in a range of wind-wave conditions and with different control strategies. The main focus was the effects of aerodynamic damping and interaction effects between the wind forcing, wave forcing and the blade pitch control algorithm. At the university Ecole Centrale de Nantes a 1/60 scaled model of an upscaled 6 MW wind turbine, on the concrete star wind platform, was tested in 2013 [19]. This platform is a braceless-semisubmersible platform design, the wind turbine thrust was upscaled from the 5 MW NREL wind turbine and was generated by a controllable ducted fan at the top of the tower. The thrust was controlled by adjusting the rotational speed of the fan, which was set by a reference from a real-time simulation of the scaled model in FAST. The contribution of this paper is the experimental validation of two numerical simulation models for the new FOWT design: the AAUE-TLP. The scaled floating wind turbine model used in this paper is referred to as AAUE-TLP. These simulation models can be used as baseline models for future studies. The simulation models will be validated in several experiments with wind and wave loads applied. The theory for developing a coupled aero-hydro-servo-elastic model for a FOWT is presented in this paper. Furthermore, to do a code-to-code comparison, the FAST model is calibrated for the AAUE-TLP. The design of AAUE-TLP differs from other state-of-the-art scaled FOWT models by being a large-sized scaled model, which have an individual blade pitch system.