CN104794349B - Ship and marine structure corrosion protection state estimation and control method - Google Patents
Ship and marine structure corrosion protection state estimation and control method Download PDFInfo
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Abstract
The invention discloses a kind of ship and marine structure corrosion protection state estimation and control method, has Database step：Ship and marine structure submerged structure boundary element model are established, draws each node of described triangular element in life cycle management, protection potential data and etch state is established in different time sections and assesses database；Calculate appraisal procedure：Obtain the space coordinates of reference electrode monitoring point; protection potential data in the space coordinates and each period of three nodes of triangular mesh described in called data storehouse where electrode monitoring point, judge the etch state of current ship and marine structure submerged structure outer surface；Protection power source output control step：Compare the protection potential value of control point reference electrode actual measurement with described protection potential reference value so as to control the described corresponding potential value of dc source output.
Description
Technical field
The present invention relates to a kind of assessment of etch state and control method, more particularly to a kind of ship based on boundary element principle
And assessment and the control method of marine structure corrosion protection state.Relate generally to Patent classificating number G01 measurements；Test G01N is borrowed
Help determine the chemically or physically property of material to test or the weatherability of analysis of material G01N17/00 test materials, it is corrosion-resistant,
Or resistance to light.
Background technology
Ship and marine structure generally use corrosion resistant coating and the compound corrosion protection system of cathodic protection, in protection period
Interior, the guard mode on its surface can be characterized by some parameters, mainly including protection potential, protecting current density, anode electricity
The measurement of stream and anode voltage.
The size of protection potential is directly connected to the quality of the protecting effect of steel construction, over time, protection electricity
Position can change.Current potential only just can be effectively protected ship and marine structure within certain numerical value scope,
Current potential excessively just (under proteciton) and current potential excessively negative (overprotection) should all avoid.Therefore it is underwater according to ship and marine structure
The protection potential distribution situation of structural outer surface carries out corrosion protection state estimation, while according to assessment result in real time to negative electrode
Protection system output current is adjusted so as to control its corrosion protection state, to ensureing ship and marine structure safe operation
And prevention failure accidents are significant.
Patent No. CN101762622A's is entitled《Trenchless construction large-diameter pipeline corrosion controlling and monitoring system》It is open
A kind of trenchless construction large-diameter pipeline corrosion controlling and monitoring system, but the system is only for trenchless construction large diameter pipeline
Corrosion data carries out related monitoring, and prior art only gives the pipeline residue longevity based on corrosion rate electrochemical model in medium
The Forecasting Methodology of life, etch state database is not established, not by Monitoring Data and data comparison in database and then commented yet
Estimate etch state.Patent No. CN202267645U's《Shaft corrosion evaluating device》Disclose a kind of shaft corrosion evaluating dress
Put, the device is using weight-loss method evaluation of corrosion speed and estimates residual life, and the possibility of human error is produced in operating process
Larger, credible result degree is low.
The content of the invention
The it is proposed of the invention for being directed to problem above, and a kind of ship and marine structure the corrosion protection state estimation developed
And control method, there are following steps：
Database step：Ship and marine structure submerged structure boundary element model are established, is obtained by pre-treatment
The node serial number and node coordinate of the triangular element of ship and marine structure submerged structure numbering, composition triangular element；
By numerical simulation calculation, show that each node of described triangular element in life cycle management, is protected in different time sections
Shield potential data simultaneously establishes etch state assessment database；
Calculate appraisal procedure：Obtain the space coordinates of reference electrode monitoring point, electrode monitoring point described in called data storehouse
Protection potential data in the space coordinates and each period of three nodes of triangular mesh at place, under usable floor area coordinate
The protection potential reference value in each period of the monitoring point is calculated in linear interpolation method；Compare monitoring point and survey what is obtained
Protection potential measured value and the protection potential reference value, determine immediate potential reference value, inquire about the database and find
Etch state file corresponding to the immediate potential reference value judges current ship and marine structure submerged structure appearance
The etch state in face；
Dc source output control step：Calculate the influence area of each dc source respectively using numerical simulation；Choose
Control point in each influence area；The protection potential reference value at each control point is set, compares control point reference electrode actual measurement
Protection potential value with described protection potential reference value so as to controlling the described corresponding potential value of dc source output.
The linear difference method is specific as follows：
Known monitoring point e space coordinates (xe, ye, ze) and its three summits of place triangular element coordinate and
Protection potential；In the triangle that the monitoring point e is formed positioned at three nodes a, b, c or on triangle border or summit；
Using area coordinate, the position of e points can be determined by following two number
Wherein Δ is triangle abc area, Δi, ΔjIt is triangle abe and triangle ace area respectively, e (li,
lj) it is referred to as area coordinate；
Rectangular coordinate system Oxy is such as taken, x can be usedeAnd yeRepresent the area of each triangle, then ΔiArea beIn formula
Because in uniform electric field, the potential value of certain point is only relevant with the position coordinates, therefore in area coordinate system
Lower e points current potential
Φe=f (xe,ye)=f (li,lj)
In addition, electric field is with apart from linear, therefore setting
Φe=mxe+nye+ c=Mli+Nlj+C
By a, 3 area coordinates of b, c and potential value substitute into above formula, can obtain equation below,
Solving above-mentioned equation can obtain, M=Φc-Φa, N=Φb-Φa, C=Φa。
Therefore monitoring point e protection potential reference value can be obtained
Φe=(Φc-Φa)li+(Φb-Φa)lj+Φa。
Compare the protection potential measured value for surveying to obtain in monitoring point in the calculating appraisal procedure with the protection potential to join
Value is examined, the method for judging the etch state of the currently monitored point is as follows：
The protection potential reference value of each monitoring point is extracted, forms P*Q etch state matrix：
Wherein P is the number of etch state file, and Q is ship and the number of marine structure submerged structure outer surface monitoring point
Amount；
The protection potential measured value of monitoring point reference electrode is formed into a Q dimensional vector, wherein Q is submerged structure outer surface
Monitoring point quantity；
The mould of each row vector difference in Q dimensional vectors that monitoring obtains and P*Q etch state matrix is sought, wherein with monitoring
To Q dimensional vectors difference the minimum row vector of mould where etch state file represent current etch state, pass through the corruption
Erosion status file can obtain ship and the etch state of marine structure submerged structure outer surface.
Also there is data screening step：
T potential vectors are：v1t, v2t..., vit..., vQt；
T+1 moment potential vectors are：v1(t+1), v2(t+1)..., vi(t+1)..., vQ(t+1)；
If vi(t+1)-vit>ε, then data v is deleted in Q dimensional vectorsi(t+1), it is believed that i-th of monitoring point failure；Delete simultaneously
Except the data of the i-th row in etch state matrix.
It is described choose influence area method be specially：Calculated respectively using numerical simulation independent in each dc source
Submerged structure outer surface Potential distribution situation under electric power thus supplied, the line of demarcation of dc source power supply area is found, determined each straight
Flow the influence area of power supply.
It is described choose control point method be specially：Multiple DC power output voltages are set, using numerical simulation calculation,
Obtain the current potential of the current potential highs and lows under different DC power output voltages.And using DC power output voltage as horizontal stroke
Coordinate, draw curve by ordinate of the current potential of current potential highs and lows respectively.In two curves, larger one of slope
The point (peak or minimum point) of representative is the control point in each region.
Also there is alarming step：If vi(t+1)-vit>ε, then data v is deleted in Q dimensional vectorsi(t+1), it is believed that i-th of prison
Measuring point fails, and sends alarm.
By adopting the above-described technical solution, ship provided by the invention and marine structure etch state appraisal procedure,
, can be accurately according to the protection of the currently monitored point electricity by the method for finite element analysis, linear interpolation analysis and numerical simulation
Bit value, estimate the etch state of current ship and marine structure underwater portion., can compared to existing analysis method
Effectively avoid its current potential excessively just or excessively negative.Over time, the total current required for impressed current cathodic protection system
It can gradually increase, adjust automatically dc source output current, guarantee surface potential can be in reasonable in real time by the above method
Scope, it instead of traditional manual adjustment.Simultaneously can also according to result of calculation to reference electrode Failure Alarm, can prevent due to
The inaccuracy of measurement result caused by reference electrode failure.
Brief description of the drawings
, below will be to embodiment or existing for clearer explanation embodiments of the invention or the technical scheme of prior art
There is the required accompanying drawing used in technology description to do one and simply introduce, it should be apparent that, drawings in the following description are only
Some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is area coordinate interpolation method schematic diagram of the present invention
Fig. 2 is the schematic diagram of etch state database of the present invention
Fig. 3 is the flow chart of the present invention
Embodiment
To make the purpose, technical scheme and advantage of embodiments of the invention clearer, with reference to the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly completely described：
As shown in Figure 3：A kind of ship and marine structure corrosion protection state estimation and control method, mainly include as follows
Step：
Database step：Ship and marine structure submerged structure boundary element model are established, passes through numerical simulation meter
Calculate the triangular element numbering for obtaining ship and marine structure submerged structure, the node serial number and node of composition triangular element
Coordinate；By numerical simulation calculation, each node of described triangular element is drawn in life cycle management, different time sections
Interior protection potential data simultaneously establish etch state database, as shown in Figure 2.
Calculate appraisal procedure：The space coordinates of reference electrode monitoring point is obtained, in called data storehouse where the monitoring point
Protection potential data in the space coordinates and each period of three nodes of triangular mesh, linear under usable floor area coordinate insert
The protection potential reference value in the monitoring point period is calculated in value method；Compare the protection electricity that monitoring point surveys to obtain
Position measured value and the protection potential reference value, determine immediate potential reference value, inquire about the database find it is described most
Etch state file corresponding to close potential reference value judges the corruption of current ship and marine structure submerged structure outer surface
Erosion state；
Dc source output control step：Calculate the influence area of each dc source respectively using numerical simulation；Choose
Control point in each influence area；The protection potential reference value at each control point is set, compares control point reference electrode actual measurement
Protection potential value with described protection potential reference value so as to controlling the described corresponding potential value of dc source output.
In above-mentioned steps, computational mathematics model is as follows used by numerical simulation
The mathematical modeling of ship and Cathodic Protection System for Marine Structure problem can be attributed to description seawater electrolysis matter region
The math equation of (Ω) inner potential state and current phasor state (governing equation in domain), description all boundary on potential state and
The math equation (boundary condition) of current status.
Governing equation
In seawater electrolysis matter region, current potential and current density satisfaction side in electric field caused by hull cathodic protection system
Journey：
In formula：Q represents current density, and Φ is current potential, and ρ is the resistivity of seawater.
When electric field reaches poised state caused by cathodic protection system, can obtain governing equation in domain is：
Boundary condition
The intact position S of ship wet structure corrosion-inhibiting coating1With Sea surface boundary SwThe current density perpendicular to boundary direction should be met
For " 0 "；Coating damage position S2Potential state and current status between relation meet polarization curve：
Apart from the enough distant place S of hull∞Current potential be constant, current density is " 0 ".In summary, the border of hull cathodic protection problem
Condition such as equation (3).
Boundary integral equation
From weighted residual equation corresponding to (3) formula, introduce elementary solution and establish boundary integral equation：
In formula, Ci is form factor, only depends on the boundary geometry in physical model.
Equation (4) is subjected to the discrete available boundary integral equation shaped like (5) on border.
H Φ=Gq (5)
In formula, H and G are coefficient matrix.
(3) formula is substituted into, and is iterated solution and can obtain the potential value of each node and normal direction current density on border.
The linear difference method is specific as follows：
Known monitoring point e space coordinates (xe, ye, ze) and its three summits of place triangular element coordinate and
Protection potential；In the triangle that the monitoring point e is formed positioned at three nodes a, b, c or on triangle border or summit；
Using area coordinate, the position of e points can be determined by following two number
Wherein Δ is triangle abc area, Δi, ΔjIt is triangle abe and triangle ace area respectively；e(li,
lj) it is referred to as area coordinate.
Such as take rectangular coordinate system Oxy, x can be usedeAnd yeRepresent the area of each triangle, then ΔiArea beIn formula
Because in uniform electric field, the potential value of certain point is only relevant with the position coordinates, therefore in area coordinate system
Lower e points current potential；
Φe=f (xe,ye)=f (li,lj)
In addition, electric field is with apart from linear, therefore setting
Φe=mxe+nye+ c=Mli+Nlj+C
By a, 3 area coordinates of b, c and potential value substitute into above formula, can obtain equation below,
Solving above-mentioned equation can obtain, M=Φc-Φa, N=Φb-Φa, C=Φa。
Therefore monitoring point e protection potential reference value can be obtained
Φe=(Φc-Φa)li+(Φb-Φa)lj+Φa。
Compare the protection potential measured value for surveying to obtain in monitoring point in the calculating appraisal procedure with the protection potential to join
Value is examined, the method for judging the etch state of the currently monitored point is as follows：
The protection potential reference value of each monitoring point is extracted, forms P*Q etch state matrix：
Wherein P is the number of etch state file, and Q is ship and the number of marine structure submerged structure outer surface monitoring point
Amount；
The protection potential measured value of monitoring point reference electrode is formed into a Q dimensional vector, wherein Q is submerged structure outer surface
Monitoring point quantity；
The mould of each row vector difference in Q dimensional vectors that monitoring obtains and P*Q etch state matrix is sought, wherein with monitoring
To the etch state file that is sitting in of the minimum row vector of mould of Q dimensional vectors difference represent current etch state, pass through the corruption
Erosion status file can obtain ship and the etch state of marine structure submerged structure outer surface.
Also there is data screening step：
T potential vectors are：v1t, v2t..., vit..., vQt；
T+1 moment potential vectors are：v1(t+1), v2(t+1)..., vi(t+1)..., vQ(t+1)；
If vi(t+1)-vit>ε, then data v is deleted in Q dimensional vectorsi(t+1), it is believed that i-th of monitoring point failure；Delete simultaneously
Except the data of the i-th row in etch state matrix.
The method of the selected characteristic point influence area is specially：Calculated respectively in each direct current using numerical simulation
Submerged structure outer surface Potential distribution situation under the independent electric power thus supplied in source, the line of demarcation of each dc source power supply area is found,
Determine the influence area of each dc source.
Choose control point method be specially：Multiple DC power output voltages are set, using numerical simulation calculation, are obtained
The current potential of current potential highs and lows under different DC power output voltages.And using the output voltage of dc source as horizontal seat
Mark, draw curve by ordinate of the current potential of current potential highs and lows respectively.In two curves, a larger generation of slope
The point (peak or minimum point) of table is the control point in each region.
Further, the present invention also has alarming step：If vi(t+1)-vit>ε, then delete data in Q dimensional vectors
vi(t+1), it is believed that i-th of monitoring point failure, send alarm.
Dc source output control step is specially：Control point position is determined, obtains its potential value；If control point is in institute
On the node for stating triangular mesh unit, the output current potential at control point is directly drawn according to the etch state file；If control
Point is in triangle interior, the then coordinate value and potential value for passing through adjacent node using the linear interpolation method under the area coordinate
The output current potential at control point is calculated.
In actual use, dc source is each straight according to the etch state file extraction obtained in etch state evaluation process
Flow the potential calculation value at power supply influence area control point, the magnitude of voltage of its output of dc source adjust automatically, until each control point
Potential measurement value it is equal with potential calculation value.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (7)
1. a kind of ship and marine structure corrosion protection state estimation and control method, there are following steps：
Database step：The boundary element model of ship and marine structure submerged structure is established, ship is obtained by pre-treatment
The node serial number and node coordinate of the triangular element of oceangoing ship and marine structure submerged structure numbering, composition triangular element；It is logical
Numerical simulation calculation is crossed, show that each node of described triangular element in life cycle management, is protected in different time sections
Potential data simultaneously establishes etch state assessment database；
Calculate appraisal procedure：Obtain the space coordinates of reference electrode monitoring point, the place of electrode monitoring point described in called data storehouse
Three nodes of triangular mesh space coordinates and each period in protection potential data, it is linear under usable floor area coordinate
The protection potential reference value in each period of the monitoring point is calculated in interpolation method；Compare the protection that monitoring point surveys to obtain
Current potential measured value and the protection potential reference value at control point, determine immediate potential reference value, inquire about the database and find
Etch state file corresponding to the immediate potential reference value judges current ship and marine structure submerged structure appearance
The etch state in face；
Dc source output control step：Calculate the influence area of each dc source respectively using numerical simulation；Choose each
Control point in influence area；The protection potential reference value at each control point is set, compares the guarantor of control point reference electrode actual measurement
Potential value is protected with described protection potential reference value so as to control the described corresponding potential value of dc source output.
2. ship according to claim 1 and marine structure corrosion protection state estimation and control method, its feature is also
It is：The linear interpolation method is specific as follows：
Known monitoring point e space coordinates (xe, ye, ze) and its three summits of place triangular element coordinate and protection
Current potential；In the triangle that the monitoring point e is formed positioned at three nodes a, b, c or on triangle border or summit；
Using area coordinate, the position of e points can be determined by following two number
Wherein ΔabcIt is triangle abc area, Δi, ΔjIt is triangle abe and triangle ace area respectively, e (li, lj)
Referred to as area coordinate；
Take rectangular coordinate system Oxy, then ΔiArea beIn formula
Because in uniform electric field, the potential value of certain point is only relevant with the position coordinates, therefore the e points under area coordinate system
Current potential,
Φe=f1(xe,ye)=f2(li,lj)
In addition, electric field is with apart from linear, therefore setting
Φe=mxe+nye+ c=Mli+Nlj+C
By a, 3 area coordinates of b, c and potential value substitute into above formula, can obtain equation below,
Solving above-mentioned equation can obtain, M=Φc-Φa, N=Φb-Φa, C=Φa；
Therefore monitoring point e protection potential reference value can be obtained
Φe=(Φc-Φa)li+(Φb-Φa)lj+Φa。
3. ship according to claim 2 and marine structure corrosion protection state estimation and control method, its feature is also
It is：Compare the protection potential measured value for surveying to obtain in monitoring point in the calculating appraisal procedure to refer to the protection potential
Value, the method for judging the etch state of the currently monitored point are as follows：
The protection potential reference value of each monitoring point is extracted, forms P*Q etch state matrix：
Wherein P is the number of etch state file, and Q is the quantity of ship and marine structure submerged structure outer surface monitoring point；
The protection potential measured value of monitoring point reference electrode is formed into a Q dimensional vector, wherein Q monitors for submerged structure outer surface
Point quantity；
The mould of each row vector difference in Q dimensional vectors that monitoring obtains and P*Q etch state matrix is sought, wherein obtained with monitoring
Etch state file where the row vector of the mould minimum of Q dimensional vectors difference represents current etch state, passes through the corrosion shape
State file can obtain ship and the etch state of marine structure submerged structure outer surface.
4. ship according to claim 3 and marine structure corrosion protection state estimation and control method, its feature is also
It is：Also there is data screening step：
T potential vectors are：v1t, v2t..., vit..., vQt；
T+1 moment potential vectors are：v1(t+1), v2(t+1)..., vi(t+1)..., vQ(t+1)；
If vi(t+1)-vit>ε, then data v is deleted in Q dimensional vectorsi(t+1), it is believed that i-th of monitoring point failure；Delete corruption simultaneously
Lose the data of the i-th row in state matrix.
5. ship according to claim 1 and marine structure corrosion protection state estimation and control method, its feature is also
It is：It is described choose influence area method be specially：Calculated using numerical simulation and individually supplied in each dc source respectively
Submerged structure outer surface Potential distribution situation in the case of electricity, finds the line of demarcation of dc source power supply area, determines each direct current
The influence area of power supply.
6. ship according to claim 5 and marine structure corrosion protection state estimation and control method, its feature is also
It is：It is described choose control point method be specially：Multiple DC power output voltages are set, using numerical simulation calculation, are obtained
The current potential of current potential highs and lows under to different DC power output voltages；And using DC power output voltage as horizontal stroke
Coordinate, draw curve by ordinate of the current potential of current potential highs and lows respectively；In two curves, slope it is larger one
The point that bar represents, peak or minimum point are the control point in each region.
7. ship according to claim 4 and marine structure corrosion protection state estimation and control method, its feature is also
It is：Also there is alarming step：If vi(t+1)-vit>ε, then data v is deleted in Q dimensional vectorsi(t+1), it is believed that i-th of monitoring point
Failure, sends alarm.
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| CN108960681B (en) * | 2018-07-27 | 2022-01-18 | 重庆市船舶检验中心有限公司 | Corrosion protection state assessment and control method for ships and marine structures |
| CN109799254A (en) * | 2019-01-18 | 2019-05-24 | 中国石油天然气集团公司 | A kind of band water transport battalion tunnel pipelines connect steel member service life prediction technique |
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