Calculation method of typhoon load on the upper block of offshore platform
A block and typhoon technology, which is applied to ships, special-purpose ships, floating buildings, etc., can solve the problems that the load calculation cannot use the steady wind model, lack of calculation methods, etc., to optimize the motion performance and structural strength, and the calculation method is simple. Effect
Active Publication Date: 2017-11-17
TIANJIN UNIV
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Problems solved by technology
In addition, the wind direction of the typhoon velocity field will change instantaneously with the movement of the typhoon center, and the calculation of its load cannot use the well-known steady wind model
How to calculate the load of the typhoon cyclone and the dynamic response of the structure caused by it, there is currently no effective calculation method at home and abroad
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[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0023] Define the coordinate system: OXYZ is the global coordinate system, point O is located at the center of gravity of the platform when it is in a static equilibrium position, and OXY is parallel to the still water surface. GX'Y'Z' is the body coordinate system that moves with the TLP, and G is the center of gravity of the TLP. At the initial moment, OXYZ coincides with GX'Y'Z'.
[0024] Step 1: Take the surrounding part 2 of the upper block 1 of the TLP, and discretize it into micro-elements 3 along the axis.
[0025] Step 2: According to the distribution of tangential velocity and radial velocity of typhoon 4, obtain the tangential wind velocity and radial velocity of typhoon 4 suffered by micro-element 3.
[0026] Step 3: Decompose the tangential wind speed and radial wind speed into the global coordinate system (represented by superscript s ...
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The invention relates to a typhoon load calculation method for an ocean platform topside block. The typhoon load calculation method comprises the following steps: dispersing an around part of a tension leg platform topside block into micro elements along an axis; acquiring a tangential typhoon speed and a radial speed to structural micro elements according to distribution of the tangential speed and the radial speed of typhoon; decomposing the tangential speed and the radial speed so as to obtain a global coordinate system; according to a moving speed of a platform self and the air speed, calculating a relative speed of a platform structure and typhoon; converting the relative speed into a normal relative speed perpendicular to the axis; converting the normal relative speed into a body axis coordinate system from the global coordinate system; counting wind load pointing to an inner normal direction of the side wall of the topside block; converting the wind load into the global coordinate system from the body axis coordinate system, thereby obtaining typhoon load of the whole topside block. By adoption of the typhoon load calculation method, typhoon load can be rapidly and conveniently calculated, and scientific technical support can be provided for prevention of accidents that the tension leg platform is turned over under the action of extreme typhoon load.
Description
technical field [0001] The invention belongs to the technical field of ocean engineering and relates to a fast calculation method for typhoon loads on large-scale ocean engineering structures. Background technique [0002] The world's offshore oil resources account for 34% of the world's total oil resources. The global offshore oil reserves are about 100 billion tons, of which the proven reserves are 38 billion tons. With the advancement of technology and the continuous development and application of new technologies and materials, the cost of offshore oil exploration and development has been reduced year by year, which has promoted the development of offshore oil development. [0003] my country's offshore oil resources are quite rich. Only the preliminary exploration of offshore oil and gas reserves in the South China Sea is 23 billion to 30 billion tons. Therefore, the development of offshore oil in the South China Sea is of great significance to promoting national econom...
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IPC IPC(8): B63B35/44
CPCB63B35/4413
Inventor 唐友刚王宾赵志娟李焱王臻魁李伟
Owner TIANJIN UNIV