سال انتشار: ۱۳۸۱

محل انتشار: پنجمین همایش بین المللی سواحل، بنادر و سازه های دریایی

تعداد صفحات: ۱

نویسنده(ها):

Hassan Abin – Parsian gulf university

چکیده:

Floting structures such as floating jetties floting bridges floting harbors, floting breakwaters have many advantages respect to fixed structures.
Floting structures offer a feasible and economic alternative to conventional in deepwater. Buoyancy and floting stability, mooring forces seakeeping, and unit structural design are fundatnental aspects.
Waves loading generally dictates the desige of a floting structures; but the designer should also evaluate other possible load such as those associated with currents, water level variations, ice, wind and vessel impact. A floting structure can be idealized as a linear vibratory system. The dynamic response of a floting structure to waves in a single mode of motion (e.g.sway) can be likened to the dynamic motions of a mass, spring, and dashpot subject to a sinusoidal forcing function. In this analogy the massof vibratory system is equal to the mass of floting structure, the damping of the mass of vibratory system is equal to the hydrodynamic damping of the floting structure, and spring of vibratory system is equal to the spring to either the mooring or buoyancy or both. the equating of motion for a six degree of freedom system subject to a sinusoidal force is:
[m+a]{x}+[b]{x}+[c]{x}={f(1)}(1)
floting structures design is a complicated an itetative process duo to the interdependency of each design factor.
for the wave structure interaction problem, fluid is usually assumed to be incompressible and inviscid. Under these conditions the fluid will remain irrotational and by using continuity equation a velosity potential U, can be defined such thet,
∆۲U1=0(2)
U1=U0+U(3)U0 and U are the incident and diffracted wave potentials. We solved this boundary value problem by using Boundary Element Method.