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However, OrcaFlex can accept RAO data using a wide range of different conventions, so you can input your RAO data in its original form and simply tell OrcaFlex what conventions apply to those data. Different modelling and design criteria will affect the nature of the 'ideal' RAO curves (as plotted graphically) being sought for a particular ship: for example, an ocean cruise liner will have a considerable emphasis placed upon minimizing accelerations to ensure the comfort of the passengers, while the stability concerns for a naval warship will be concentrated upon making the ship an effective weapons platform. 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. The Froude–Krylov force, which is the pressure in the undisturbed waves integrated over the wetted surface of the floating vessel.
The first thing I noticed when we walked in was how bright the place is. It may be the brightest fine-dining establishment I've ever been to. The second thing I noticed was all the Christmas decorations (a story I'd read said they stay up year-round). Every chair at every table was full and the bar was crowded. An older bespectacled man sat on a stool in the corner, surveying the room, and motioned to suggest we sit at the two stools open next to him. RAOs can be obtained either from model tests or from diffraction analysis software. The data may be presented in tabular or graphical form: tables of numbers are better for our purposes since they can be imported directly into OrcaFlex (see importing hydrodynamic data). Good guy. I like him. He's okay. I could sit with Peter King and say what I like and what I don't like. I'm a political junkie," Frank says. There's a letter from President George H.W. Bush on the wall. Frank doesn't discriminate.The Diffraction forces, which are pressures that occur due to the disturbances in the water because of a body being present. The system used to define wave direction. In OrcaFlex 0° means waves approaching the vessel from astern and 90° means waves coming from the starboard side, but if a different convention applies to your data then you must allow for this when entering the data. As it turns out, Frank sang in a group called the Holidaes in the 1960s. "I was an old doo-wop guy," he says. "I get Billy Joel, Sting, Jimmy Fallon in here. Jimmy Fallon loves to sing doo-wops! So whenever he's here, I start singing, and boom, he jumps up and starts singing. And before you know it the whole room is going nuts."
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. There's only one table for two in the restaurant. "And if you're willing to wait, I'll feed you at that deuce," Pellegrino says. Damping (Hydrodynamic) forces due to the oscillations creating outgoing waves which carry energy away from the ship.
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Anthony! This is Anthony Abbot," Frank says. "He's a member of Stanwich, a great golf club. He invites me to play golf with him." Abbot went on a golf trip with 11 other guys 20 years ago. Frank was one of them, and when names were drawn out of a hat, he and Abbot were matched up.
This was in January, and Frank said, 'Can you come here May 6?' I didn't know anything. So he writes the date on a business card and hands it to me and says, 'Two things just happened: One, you got a reservation at Rao's which is no small deal. Two, you can always get a reservation at Rao's. I love you. [Abbot makes a kissing sound.] Both cheeks." 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.
Sciortino, who recently celebrated his 50th birthday at Rao's in Los Angeles, gets a table about once a month, but the days vary. Tonight he has a Monday. Next month he has a Thursday. Like the rest of the table owners, he gets his assignments at the beginning of the year. He's been coming here—"coming home," as he calls it—for 25 years. 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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