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A surge RAO of 0.5 in a wave of height 4m (and hence wave amplitude 2m) means that the vessel surges to and fro -1m to +1m from its static position; a pitch RAO of 0.5° per metre in the same wave means that the vessel pitches from -1° to + 1°. Frank looked around the room. "That first table there, they gave their table to this group at the bar. These guys are all executives from PepsiCo. If you have a table, you can give it to your friends, your business associates, or to a charity auction. I had Bobby Flay, Michael Romano, a whole bunch of big chefs last week and I didn' t know they're coming. I never know who's coming in. That's what makes it wonderful. It's serendipity. There's no grand design or plan. The only caveat is if you're not going to use your table and no one else is going to use that table, that's when you call me."
I need your help," he tells Tantillo. "You remember my cousin? He sent me an invitation to his son's wedding and I need you to interpret the letter. I want to send him them something." Tantillo speaks fluent Italian. Frank doesn't. The RAO is a transfer function that is only defined when the ship motions can be assumed to be linear. The above forces can then be assembled into an equation of motion:Wave load RAOs do not completely define the vessel motion as do displacement RAOs: they merely define the force and moment which a wave exerts on the vessel. OrcaFlex uses these forces and moments, together with any other loads on the vessel and data on the vessel's mass and inertia, to determine the vessel motion from its equation of motion. It's 10:20 p.m. We've been here since 7:45, but the hours have gone by in a flash and I have no desire to give up my bar stool and leave the center of all the action. Although OrcaFlex allows the RAO input data to use a wide range of systems, all OrcaFlex results use a right-handed system in which the positive movements are as follows: Surge In the old days, Abbot says, Frank used to open the reservation book on a quarterly basis and when he came by to get his table assignment, Donald Trump was waiting in line outside the door with other regulars. The coordinate system used to define vessel motions and, in particular, which direction is positive. That is, whether surge is positive forward or aft, whether heave is positive up or down and whether pitch is positive bow up or bow down.
On a computer the above algorithm was first introduced by using strip theory and Boundary Element Method. Today both of the methods are still used if the need for fast calculations outweigh the need for precise results and the ship designer knows the limitations of strip theory. More advanced programs that are used today utilizes Boundary Element Method through different applications (such as WAMIT, SESAM WADAM, MOSES, NeMOH and ANSYS AQWA) some may also include the effects of viscosity. The insight into the forces that governs the seakeeping behavior of a ship gained from the above are of course still valid within considered limits of free surface linearity. She doesn't eat shellfish or meat," I say, louder this time. "But I eat everything and I want to try what you're known for." RAOs are effectively transfer functions used to determine the effect that a sea state will have upon the motion of a ship through the water, and therefore, for example, whether or not (in the case of cargo vessels) the addition of cargo to the vessel will require measures to be taken to improve stability and prevent the cargo from shifting within the vessel. Generation of extensive RAOs at the design phase allows shipbuilders to determine the modifications to a design that may be required for safety reasons (i.e., to make the design robust and resistant to capsizing or sinking in highly adverse sea conditions) or to improve performance (e.g., improve top speed, fuel consumption, stability in rough seas). RAOs are computed in tandem with the generation of a hydrodynamic database, which is a model of the effects of water pressure upon the ship's hull under a wide variety of flow conditions. Together, the RAOs and hydrodynamic database provide (inasmuch as this is possible within modelling and engineering constraints) certain assurances about the behavior of a proposed ship design. They also allow the designer to dimension the ship or structure so it will hold up to the most extreme sea states it will likely be subjected to (based on sea state statistics).
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I am that old! I could be your father!" says Frank, who will celebrate his 70th birthday this year. Damping (Hydrodynamic) forces due to the oscillations creating outgoing waves which carry energy away from the ship. The reference time for phase angles, and the reporting convention used (e.g. whether phases are reported as lags or leads). Again, OrcaFlex allows a range of options.
In the field of ship design and design of other floating structures, a response amplitude operator ( RAO) is an engineering statistic, or set of such statistics, that are used to determine the likely behavior of a ship when operating at sea. Known by the acronym of RAO, response amplitude operators are usually obtained from models of proposed ship designs tested in a model basin, or from running specialized CFD computer programs, often both. RAOs are usually calculated for all ship motions and for all wave headings.And this is Tony Tantillo. He's on CBS every day, cooking with his daughter," Frank says, introducing us to another friend who's come up to the bar. "Listen, Tantillo. I gotta tell you. You're too good-looking. You're too handsome."
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