Theoretical investigation of springing-ringing problems in tension-leg-platforms /
In this research, the springing-ringing problems in Tension-
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=743274461&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | In this research, the springing-ringing problems in Tension- Leg-Platforms (TLP) are investigated theoretically. A systematic method for the dynamic simulation of a coupled Three-Dimensional (3-D) TLP has been developed, which can also be applied in the analysis of other kinds of floating production systems. The theory includes spectral filtering method for 3-D wave generation, the Volterra model technique and Higher-Order Boundary Element Method (HOBEM) for the simulation ofnonlinear wave forces, and nonlinear 3-D dynamics of the coupled TLP system. The improved spectral filtering method can generate almost-infinitely-longtime series of unichrectional/directional Gaussian random waves, including the time series of water particle velocity and acceleration. Then, the simulated waves are used in the emulation of time series of nonlinear wave forces with the Volterra model technique by applying a priori obtained frequency-domain HOBEM results. Next, the nonlinear dynamic simulation of a 3-D TLP system with large displacements is carried out, in which the pretension in tendons is taken into account and hybrid elements based on a generalized virtual work principle are employed for tendons. Besides, the up-dated Lagrangia,n method has been improved to enhance the efficiency of calculation Comparison shows that the software using the improved updated Lagra,ngian method runs as much as five- times faster than the ordinary method. Finally, the simulated dynamic responses of the TLP system are analyzed with time-domain and frequency-domain, as well as statistical methods. Results for the ISSC TLP are presented. |
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| Item Description: | Vita. "Major Subject: Ocean Engineering". |
| Physical Description: | xiii, 152 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |