DYNAMIC RESPONSE OF A WINGSAIL MAST TO UNSTEADY AERODYNAMIC LOADS INCLUDING SHIP MOTION EFFECTS (COMMERCIAL SAIL, STRUCTURAL)

Development of an analytical procedure to calculate the dynamic response of a wingsail mast is discussed. The loads consist of unsteady aerodynamic forces on the wingsail and inertial loads due to motion of the ship. A FORTRAN-80 program for microcomputers is developed to automate the procedure.;An example calculation is performed using as a basis a wingsail designed for a 277-foot (91 m) chemical tanker. The structural response of the wingsail mast to the unsteady aerodynamic loads and the inertial loads due to heave, pitch and roll of the ship is calculated. In this particular case, it is found that the inertial effects dominate, but the unsteady aerodynamic loads may be of the same magnitude as the steady aerodynamic loads.