Presentation-Jonkman's report_Meysam.pptx

it is about mooring line of the floating wind turbines

1. Mooring System Modeling J.M. Jonkman 2007 Meysam Gheysari May 2023

2. Total Load on The Platform The total load on the support platform from the contribution of all mooring lines: represents the pre-tension at the fairleads from the weight of the cable not resting on the seafloor in water. If the catenary lines were neutrally buoyant , then would be zero . is the ( i,j ) component of the linearized restoring matrix from all mooring lines.

3. Jonkman’s Quasi-static Module The Jonkman’s quasi-static module can model an array of homogenous taut or slack catenary mooring lines. It accounts for the apparent weight in fluid, elastic stretching, and seabed friction of each line, but neglects the individual line bending stiffness. Because the module is fully coupled with FAST and ADAMS, it also accounts for the nonlinear geometric restoration of the complete mooring system.

4. Module Calculation Procedure

5. Local Coordinate System

6. Analytical Formulation In the local coordinate system, the analytical formulation is given in terms of two nonlinear equations in two unknowns. The unknowns are the horizontal and vertical components of the effective tension in the mooring line at the fairlead, HF and VF, respectively. (The effective tension is defined as the actual cable [wall] tension plus the hydrostatic pressure .)

7. When No Portion of The Line Rests on The Seabed :

8. When A Portion of The Mooring Line Adjacent To The Anchor Rests on The Seabed:

9. Initial Guess In The Newton-Raphson Iteration:

10. The Horizontal And Vertical Components of The Effective Tension At The Anchor:

11. Configuration of, And Effective Tensions Within The Mooring Line:

12. Configuration of, And Effective Tensions Within The Mooring Line, When A Portion of The Mooring Line Rests on The Seabed:

13. Thank you !