Method for determining wave-induced fatigue safety factor of marine riser based on reliability

A technology for determining the method and safety factor, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of inability to evaluate the fatigue life of risers caused by waves, and achieve the effect of reducing the possibility

Active Publication Date: 2018-09-21
ZHEJIANG UNIV OF TECH +1
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Problems solved by technology

[0003] In order to overcome the inadequacy of existing technologies that cannot evaluate the wave-induced fatigue life of risers, the present invention provides a method for determining the safety factor of wave-induced fatigue of marine risers based on reliability, which can effectively determine the safety factor of wave-induced fatigue of marine risers , to guide the design of wave-induced fatigue of marine risers, and reduce the possibility of wave-induced fatigue damage of marine risers

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  • Method for determining wave-induced fatigue safety factor of marine riser based on reliability
  • Method for determining wave-induced fatigue safety factor of marine riser based on reliability
  • Method for determining wave-induced fatigue safety factor of marine riser based on reliability

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[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] refer to figure 1 and figure 2 , a method for determining the reliability-based wave-induced fatigue safety factor of marine risers, the determination method comprising the following steps:

[0032] Step S1, introducing a relational expression to construct a wave-induced fatigue limit state equation in logarithmic form;

[0033] Step S2, determining random variables that affect wave-induced fatigue damage;

[0034] Step S3, constructing the response surface of the fatigue damage of each random variable, and calculating the partial derivative of the fatigue damage to each random variable;

[0035] Step S4, using the first-order second-order moment method to obtain the expression of the reliability index;

[0036] Step S5, obtaining the target reliability index of the total life from the annual failure probability;

[0037] In step S6, a fatigue safety facto...

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Abstract

A method for determining the wave-induced fatigue safety factor of the marine riser based on reliability is provided. The method comprises: introducing a relational expression, and constructing the wave-induced fatigue limit state equation in logarithm; determining the random variables affecting the wave-induced fatigue damage; constructing a response surface of the fatigue damage of each random variable, and calculating the partial derivative of the fatigue damage to each random variable; using a second-order moment method to obtain an expression of the wave-induced fatigue reliability indexof the riser; obtaining a target reliability index of the total life of the riser from the annual failure probability; deriving a safety factor formula of the wave-induced fatigue; and giving a calculation flow and examples. The method provided by the present invention can be used to guide the design and evaluation of wave-induced fatigue strength of the marine riser.

Description

technical field [0001] The invention belongs to the field of marine engineering design, and relates to the design and evaluation of the wave-induced fatigue strength of marine risers, in particular to a method for determining the wave-induced fatigue safety factor of marine risers. Background technique [0002] The wave-induced fatigue life of risers is difficult to evaluate accurately for the following reasons. First, the dynamic response during service is mainly determined by the floating body motion and viscous fluid load in the complex ocean environment, and its load is difficult to predict accurately; second, the calculation model of fatigue life, including the S-N curve and the Miner linear accumulation method, also has its own A certain amount of uncertainty. In the current code, in order to ensure the design life of the riser, for all kinds of traditional floating body-riser systems, for the three safety levels of low, medium and high, a relatively conservative stan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/04G06F30/20G06F30/13
Inventor 吴剑国李智博万子诚张萌张国进孙政策
Owner ZHEJIANG UNIV OF TECH
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