System model for ship hull motions and deformations determining in the sailing conditions

Abstract

The system model considers the ship hull in general position that includes trim and heel conditions, and general shape of deformation consisting of bending in inclined longitudinal vertical plane, bending in inclined longitudinal horizontal plane and torsion with inclined position. The measuring points scanned angles of bending in the main bending planes are corrected due to transversal inclination of measuring points and vice versa. The paper considers the system for the measuring of inclination angles on the ship hull measuring points. The measuring points consist of three digital inclinometers operating together that measure inclination angles in longitudinal vertical plane (xz), plane parallel to longitudinal horizontal plane (xy) as well as in transversal vertical planes. The system consists of measuring points which are placed at the deck connection of transversal and longitudinal bulkheads or transversal bulkhead and sheer strake. The paper describes use of measured and calculated angles of inclinations. This paper is also the base upon which it is possible to organize the real system of ship hull deformations and motions monitoring in service and sailing conditions.