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Wednesday, July 29, 2020 | History

1 edition of The effects of wave spreading on the exciting forces on a tension leg platform found in the catalog.

The effects of wave spreading on the exciting forces on a tension leg platform

by Rolf A. Dietrich

  • 137 Want to read
  • 1 Currently reading

Published by MassachusettsInstitute of Technology .
Written in English

    Subjects:
  • Naval architecture,
  • Mechanical engineering

  • Edition Notes

    ContributionsNaval Postgraduate School (U.S.)
    The Physical Object
    Pagination1 v. :
    ID Numbers
    Open LibraryOL25410748M

    1. Disturbing force-creates them 2. Influence of Disturbing Force once the wave is formed 3. Restoring Force- tries to flatten waves 4. Wavelength Disturbing Forces 1. Blowing wind for wind waves 2. Arrival of a storm surge, change in Pressure – seiche 3. Land slides, eruptions, faulting - Seismic Sea Waves 4. G on Earth –Tides. Three different types of wind waves develop over time: Capillary waves, or ripples, dominated by surface tension effects.; Gravity waves, dominated by gravitational and inertial forces.. Seas, raised locally by the wind. Swells, which have travelled away from where they were raised by wind, and have to a greater or lesser extent dispersed.; Ripples appear on smooth water when .

      More than migrants have crossed the English Channel to the UK in just three days, including a toddler today, as it was revealed France is expected to demand £30million to help stem the flow. Critical examinations are reported for the effects of wave stretching on realistic representations of the wave forces that act on offshore structures. Examinations are also made for the importance of such effects on the corresponding structural responses, and it is demonstrated that the effects of stretching on the governing wave forces and the.

    The restoring force always points back to the equilibrium point and is a property of the medium. For sound waves, the medium is air and the restoring force is air pressure. For water waves, the medium is the water and the restoring force is either surface tension or gravity. A wave, or a disturbance of a medium does not stay localized. When the tension on the string is increased by twisting the tuning peg at the end of the neck, the frequency of the string increases. According to this video, increasing the tension on a string also increases the speed of the wave moving through it. According to this article, the speed of a wave is higher in a more dense medium.


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The effects of wave spreading on the exciting forces on a tension leg platform by Rolf A. Dietrich Download PDF EPUB FB2

Uction Presentdayplatforms,inwaterdepthsfrom10to feet, thepresentlimitofaboutfeetwasapproachedmany. Tension leg platform - see Figure 9 Drilling, production, dry trees to control mass and stiffness characteristics so as to mitigate the effects of periodic wind, wave and current forces.

Ewans K.C. World-wide Measurements of Directional Wave Spreading, J. Atmospheric and Oceanic Technology, Vol pp [Presents. Tension leg platforms (TLPs) with a smaller mass ratio (mr, the ratio of the platform mass to the displacement), may experience more pronounced FIM responses in. Tension Leg Platform.

A Tension Leg Platform (TLP) is a vertically moored compliant platform. The floating platform with its excess buoyancy is vertically moored by taut mooring lines called tendons (or tethers). The structure is vertically restrained precluding motions vertically (heave) and rotationally (pitch and roll).

A full impact force history is needed to account for the temporal variation of the forces and pressures induced by the breaking wave. For practical reasons the typical impact force history.

The higher the tension in the string is, the easier it is for a wave to travel through it, and if the speed of the wave increase, so will the frequency, and by default the pitch of the note. And. Floating structures are categorized into four main classes (Fig.

): floating production storage and offloading vessel (FPSO), semisubmersible (semi), surface-piercing articulated riser (spar), and tension leg platform (TLP).Spars are the most common floater type circa followed by TLP/MTLPs and semisubmersibles (Table ).Floaters span a wide range of production.

To find the floodproofing design depth over which flood forces will be considered, use Equation 5 ft. Solution for #3: The buoyancy force can be found as follows: • The calculation of buoyancy forces and comparison with structure weight is a critical determination of this problem.

While buoyancy of the first floor is not an issue (since. Wave loads 18 Wave frequency motions 19 Low frequency motions 19 Deep Structure Vortex Shedding 19 9 MOORING ANALYSIS 20 General 20 Analysis cases 20 mooring Line length/tension adjustment 21 Analysis techniques 21 10 DESIGN AND STRENGTH 23 General 23 Redundancy   b) Computation of the wave forces on individual members and on the total structure, from the fluid motion.

Design wave concept is used, where a regular wave of given height and period is defined and the forces due to this wave are calculated using a high-order wave theory. Usually the maximum wave with a return period of years, is chosen.

One platform is a Dutch study of a tri-floater platform using a catenary mooring system, and the other is a mono-column tension-leg platform developed at the National Renewable Energymore» Cost estimates showed that single unit production cost is $ M for the Dutch tri-floater, and $ M for the NREL TLP concept.

directional spread of wave energy, in contrast to the directional narrowing with decreasing depth predicted by refraction theory (Snell's law). During low-energy wave conditions, when breaking-induced wave energy losses over the instrumented transect are small, the observed mean propagation direction and spread about the mean both decrease with.

When a wave reaches the end of the medium, it doesn't just vanish. A portion of its energy is transferred into what lies beyond the boundary of that medium. And a portion of the energy reflects off the boundary and remains in the original medium.

This Lesson discusses the principles associated with this behavior that occurs at the boundary. The force-velocity curve is simply a relationship between force and velocity and can, therefore, be displayed on an x-y graph (Figure 1).

The x-axis (i.e. horizontal axis) indicates velocity, for example, this may represent muscle contraction velocity, or velocity of movement (measured in meters per second). Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible.

Surface tension allows insects (e.g. water striders), usually denser than water, to float and slide on a water surface. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air. We have observed that an increase in the tension of a string causes an increase in the velocity that waves travel on the string.

In this activity we will examine the precise relationship between tension (T) the force applied to the string, the wave speed (v w) and the linear mass density of the string (µ = m/L which is measured in kg/m). MIT's Department of Mechanical Engineering (MechE) offers a world-class education that combines thorough analysis with hands-on discovery.

One of the original six courses offered when MIT was founded inMechE's faculty and students conduct research that pushes boundaries and provides creative solutions for the world's problems. The resultant forces were computed in the above section and are given as ASCE equations and The lateral force component can be computed using ASCE equation which comes from solving for the horizontal component of a force.

Figure Wave Pressure on a Nonvertical Wall. Oblique Breaking Waves. When a wave travels along a string, the wave speed depends exclusively on the properties of the string, whereas the wave frequency is set by the oscillator that creates the waves.

The wavelength is a quantity that can vary if either the wave speed or the wave frequency is changed. The culprit to blame for the American people’s negative view of police officers is the media. This analysis will consist of three parts.

First, a general analysis of the relationship between the media and law enforcement and how they affect each other is necessary. Seastar platforms are like miniature tension leg platforms.

The platform consists of a floating rig, much like the semi-submersible type discussed above. A lower hull is filled with water when drilling, which increases the stability of the platform against wind and water movement. In addition to this semi-submersible rig.

In The 5th Wave — the first book of a trilogy — humanity must deal with all of these things in rapid succession. An alien invasion leaves the. tion (ABFE) of 8 feet, located between thefoot wave contour and the 3-foot wave contour (Coastal A zone). The local grade elevation is 5 feet North American Vertical Datum (NAVD).

The calculations assume short- and long-term erosion will occur and the ground elevation will drop foot during the life of the structure.