Method for evaluating corrosion reliability of oil-gas pipeline falling objects by using grey system

Method for evaluating corrosion reliability of oil-gas pipeline falling objects by using grey system

  • CN 106,355,320 A
  • Filed: 08/29/2016
  • Published: 01/25/2017
  • Est. Priority Date: 08/29/2016
  • Status: Active Grant
First Claim
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1. a kind of gray system sea-bottom oil-gas pipeline pendant thing corrosion reliability estimation method is it is characterised in that comprise the following steps:

  • 1) obtain the data sequence x of oil and gas pipes each Corrosion monitoring point(0)=(x(0)(1),x(0)(2),…

    ,x(0)(n)), wherein, x(0)K () is the corrosion depth that kth time detects;

    2) the smooth of data sequence calculating oil and gas pipes each Corrosion monitoring point compares σ

    than ρ

    (k) and level(1)(k);

    3) according to step

         2) the smooth of data sequence of oil and gas pipes each Corrosion monitoring point that obtain compare σ

    than ρ

    (k) and level(1)(k)Judge whether the data sequence of oil and gas pipes each Corrosion monitoring point meets slickness condition, when oil and gas pipes each Corrosion monitoring pointWhen data sequence meets slickness condition, then the data sequence according to oil and gas pipes each Corrosion monitoring point builds Lycoperdon polymorphum Vitt differential sideJourney;

    4) single order Accumulating generation sequence x is obtained by Grey Differential Equation(1)=(x(1)(1),x(1)(2),…

    ,x(1)(n)), wherein,5) according to single order Accumulating generation sequence x(1)Calculate next-door neighbour'"'"'s average generation sequence z(1)=(z(1)(2),z(1)(3),…

    ,z(1)(n)), wherein,6) according to next-door neighbour'"'"'s average generation sequence construct grey differential equation;

    Wherein, a and b is constant;

    7) solution procedure

         6) grey differential equation set up, obtain time response series8) according to time response seriesCalculate the data sequence x of oil and gas pipes each Corrosion monitoring point(0)Reducing value9) the data sequence x according to oil and gas pipes each Corrosion monitoring point(0)Reducing valueCalculate oil and gas pipes respectively to corrodeThe data sequence x of test point(0)Residual sequence, there is k in residual sequence0, meetResidual epsilon(0)K the symbol of () is consistent,n-k0>

    =4, then can model residual error rear be (| ε

    (0)(k0)|,|ε

    (0)(k0+1)|,…

    ,|ε

    (0)(n|);

    10) by step

         9) obtain modeling residual error rear (| ε

    (0)(k0)|,|ε

    (0)(k0+1)|,…

    ,|ε

    (0)(n) |) as new oilThe data sequence of feed channel each Corrosion monitoring point, then repeat step

         4) -9), obtain revised time response formula, further according to repairingTime response formula after just and step

         7) time response series that obtainBuild Residual Error Modified Model;

    11) gray system sea-bottom oil-gas pipeline pendant thing corrosion reliability is assessed according to Residual Error Modified Model.

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