Normal mode analysis of the dynamic response of the OTEC cold water pipe and platform system to a random seaway

Thesis/Dissertation · Mon Jan 01 00:00:00 EST 1979

OSTI ID:6325511

Hwang, Y L

A general procedure for a linearized frequency domain analysis of the coupled OTEC cold water pipe (CWP) and ship system in random waves has been developed. The complete dynamic system is considered as composed of two substructures - the ship, represented as a free-floating rigid body, and the CW pipe, idealized by finite elastic beam elements with internal water flow. The dynamic equations of motion of the CW pipe, therefore, include the effect of velocity of the fluid within the pipe and the momentum change of the fluid at the entrance of the CW pipe. These equations are coupled to the equations of ship motion by matching the displacements and motions of pipe and ship at the attachment point between the two. The dynamic response of the coupled system to the wave loads may be obtained by using the method of normal mode-superposition to solve the complete equations of motion in the frequency domain. This normal mode approach is capable of producing the results to any desired degree of accuracy by including the necessary number of modes of vibration of the CW pipe. Two examples have been studied to present the effects of internal water flow and the effectiveness of this analytical formulation.

• OSTI ID: 6325511
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
OCEAN THERMAL POWER PLANTS
OFFSHORE PLATFORMS
PIPES
WAVE FORCES
EQUATIONS OF MOTION
FLOW MODELS
FLUID FLOW
MATHEMATICAL MODELS
MOTION
RESPONSE FUNCTIONS
WATER
DIFFERENTIAL EQUATIONS
EQUATIONS
FUNCTIONS
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
PARTIAL DIFFERENTIAL EQUATIONS
POWER PLANTS
SOLAR POWER PLANTS
THERMAL POWER PLANTS
140800* - Solar Energy- Ocean Energy Systems