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

Abstract

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.

Dynamics of a fin driven boat - modeling and simulation

“…The other person is fixed in the front of the boat as a not moving passenger. The figure described the boat is presenter in [11].…”

“…Its stiffness is based on measurements. The motion of an MBS (Lagrange equation) are written in [1] and [11].…”

“…Here m i 1 ,i 2 (i 1 , i 2 = 1, ... , 6) -the added mass coefficients are written in [11], j, q, l take the values 1, 2, 3 and as the index i is used to denoted the six components of the velocity potential i = 1, . .…”

“…In (3.1) the added mass coefficients are depending on the geometry of body and on velocity U . Substituting the force and torque (3.1) to the generalized force formula (2.4) in [11] we have the generalized force from water to each element of the fin. But if we put all this exterior generalized force to the right side of Langrange's equation (2.1) in [11], our program is shut-down because the acceleration of the fin at the first moment is too big then the following force also is too large.…”

“…Alaska provides both linear and nonlinear computation (see [12]) . In [11] the external forces and torques acting on the finds are calculated by the help of added mass coefficients of Multibody Fluid Systems (MBFS) . Besides this added forces and torques, in this paper the turbulence to the fins (see [6]), the hydrostatic force and torque (see [4]), the flow resistance to the boat (see [5]) are applied to simulate the external force to the boat.…”