TAILIEUCHUNG - Application of numerical water force to a small sport boat running on a lake

In this paper the motion of a small sport boat running on a lake is simulated using alaska tools. External forces and torques from water during movement have been taken into account. Using results from measurements the simulation has been validated. Keywords. multibody system equations, fluid forces and torques to running boat, validations by measurement. | Vietnam Journal of Mechanics, NCST of Vietnam Vol. 25, 2003, No 2 (85 - 96) APPLICATION OF NUMERICAL WATER FORCE TO A SMALL SPORT BOAT RUNNING ON A LAKE H. T. TRAN, S. BIKOWSKI, C. D. WOLF, P. MAIBER Institute of Mechatronics at the Chemnitz University of Technology, Reichenhainer Str. 88, D-09126 Chemnitz, Germany ABSTRACT. In this paper the motion of a small sport boat running on a lake is simulated using alaska tools. External forces and torques from water during movement have been taken into account. Using results from measurements the simulation has been validated. Keywords. multibody system equations, fluid forces and torques to running boat, validations by measurement. 1. Introduction The water force to a boat running on a sea or lake is investigated in recent years. Except the hydrostatic force and th~ flow resistance to the boat there are the water force and torque influence on the boat during running time. These force and torque are depending on added mass coefficients, acceleration and velocity components of the boat (see Newman 1985) . Using the finite boundary element method we can calculate these added mass coefficients. Therefore, we will get the water force and torque acting on the boat during movement. The boat is considered as a multibody system. In this problem we have to simulate the motion of this Multibody System (see MaiBer 1988, 1997) under the influence of the water external force and torque on the boat. To calculate this motion of the boat we use alaska tools. 2. Formulation of the problem Let us consider a small boat running on a lake. This boat is regarded as a multibody system (MBS) and consists of two kayaks used as hull. Between them, the articulated four bar driving system is placed. This mechanism is protected by patent which transforms the displacement of the driver standing on the lower platform into a vertical movement of the fin (figure 1). To investigate the behavior of the boat, a multibody alaska model is used. The degree

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