In order to measure the force components separately, DYNA has an internal rigid aluminium framework structure in the hull (Figure 1). All the different force components are coupled with the framework structure only. Six component balances are used to connect the hull and keel to the internal structure and a five-component balance for the rudder. All rig components are connected to the framework and load cells measure the forces at the attachment points.
The focus of the project is the investigation of the hydrodynamic aspects and the full size measurements are compared to the results from CFD simulations (e.g. RANSE), scale model tests in the towing tank and cavitation tunnel tests of different keel designs. The aerodynamic data is only used to obtain the lift and drag coefficients of the rig, which are required to perform VPP calculations. The data is not compared to model tests or numerical solutions as part of the initial project.
The internal rigid aluminum frame allows the aerodynamic and hydrodynamic forces to be measured separately.
