CN109858112A - Numerical inversion analysis method based on structural stress monitoring result - Google Patents
Numerical inversion analysis method based on structural stress monitoring result Download PDFInfo
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Abstract
The present invention provides a kind of numerical inversion analysis method based on structural stress monitoring result, comprising steps of S1: selecting multiple stress monitoring points, it is applied around local load in stress monitoring point, and survey calculation obtains the actual measurement structural stress changing value at stress monitoring point；S2: selecting structure object simultaneously establishes finite element grid；S3: a selected initial boundary load；S4: the stress of each stress monitoring point under initial boundary load is calculated；S5: parametric regression is carried out to stress and structural stress variation relation formula, obtains the Primary Numerical model of the edge load of structure objects；S6: examining and calibrates Primary Numerical model, obtains a final numerical model.A kind of numerical inversion analysis method based on structural stress monitoring result of the invention effectively plays numerical value calculating and field measurement method both sides advantage, obtains the primary stress of measuring point, provide guidance for the structural stress long term monitoring of ocean platform.
Description
Technical field
The present invention relates to ship or offshore platform structure stress monitoring fields, more particularly to a kind of structural stress that is based on to monitor
As a result numerical inversion analysis method.
Background technique
Ship or offshore platform structure stress monitoring can obtain the firsthand information of platform key position stress variation, right
It plays a significant role in the safe operation state of analysis ocean platform.Primary stress at platform point position is for Evaluation Platform
Node stress safety during operation is very crucial.However, due to the foil gauge applied during shipbuilding to plate
Survival rate is low, and plate can bear local load again after the completion of shipbuilding causes to be difficult accurately to obtain initially answering at key node
Power.
In conventional numerical analysis, first by calculating overall deformation of the ocean platform under external load function,
The boundary condition of partial model is transmitted by the connecting node of overall model and local larger structure model again.But locate in this way
There are two defects for reason: 1) it is very big to carry out FEM calculation workload for works Holistic modeling；2) works is building welding
And weather exposure and time aging action flowering structure shape gradually change, and produce irreversible plastic deformation.More than because
The presence of two defects obtains accurate local boundary condition if necessary, simple using first at numerical value calculating acquisition node
The method of beginning stress is worthless.
Summary of the invention
In view of the deficiency of the prior art, the present invention provides a kind of numerical inversion based on structural stress monitoring result
Analysis method is effectively played numerical value and is calculated and field measurement method by numerical value means inverting structural stress field actual measurement results
Both sides advantage obtains the primary stress of measuring point, provides guidance for the structural stress long term monitoring of ocean platform.
To achieve the goals above, the present invention provides a kind of numerical inversion analysis side based on structural stress monitoring result
Method, comprising steps of
S1: selecting multiple stress monitoring points on an ocean platform, is applied around local load in the stress monitoring point,
And survey calculation obtains the actual measurement structural stress changing value at the stress monitoring point；
S2: selecting structure object simultaneously establishes finite element grid；
S3: an initial boundary load is applied to the structure objects, and is determined according to the stress of the ocean platform
The Main way and load level of the boundary stress of the ocean platform select an initial boundary load；
S4: the actual measurement primary stress of each stress monitoring point under the initial boundary load is calculated；
S5: it is calculated according to a preset primary stress and the relational expression of structural stress changing value and obtains the change of theoretical construct stress
Change value；Parametric regression is carried out to the relational expression of the primary stress and structural stress changing value, until the theoretical construct stress
Changing value is consistent with the actual measurement structural stress changing value, obtains the Primary Numerical model of the edge load of the structure objects；
S6: examining and calibrates the Primary Numerical model, obtains a final numerical model.
Preferably, in the S1 step:
By way of integrated structure finite element analysis computation and site inspection, structural stress on the ocean platform is selected
The opposite higher multiple positions of other positions are as the stress monitoring point.
Preferably, in the S1 step, keep the ocean platform generally in static balance state, in the stress monitoring
Point is applied around local load, measures the stress variation value at each stress monitoring point, is calculated according to the stress variation value
Obtain the actual measurement structural stress changing value.
Preferably, in the S2 step:
Choosing the region in the distance range of three from stress monitoring point position purlin shelves is the structure objects, and
The finite element grid is established on the ocean platform, the finite element grid includes multiple grid cells, the grid cell
Distribution density to far from the stress monitoring point direction it is gradually sparse.
Preferably, it in the S4 step, using the finite element grid and the initial boundary load, calculates and obtains each institute
State the stress of stress monitoring point.
Preferably, in the S5 step, using intelligent optimization algorithm to the primary stress and structural stress changing value
Relational expression carries out parametric regression.
Preferably, the primary stress and the relational expression of structural stress changing value, which are provided with an error, allows the factor.
Preferably, in the S6 step, the stress of multiple ocean platforms is randomly choosed, and is utilized described preliminary
Numerical model carries out numerical value calculating, and calculated result and measured result are compared, examine and calibrate the Primary Numerical mould
Type obtains the final numerical model.
Preferably, the intelligent optimization algorithm includes: machine learning, genetic algorithm and neural network algorithm.
The present invention due to use above technical scheme, make it have it is following the utility model has the advantages that
By the foundation of final numerical model, can ocean platform any military service stage (before construction, after building, lie up,
Undock stage etc.) it carries out, strain transducer must not be laid before platform construction by conventional method limited, method is simple and convenient,
Collection period is short, will not impact to platform construction.Meanwhile it can effectively play numerical value and calculate and two aspect of field measurement method
Advantage, the primary stress accuracy for obtaining measuring point is high.
Detailed description of the invention
Fig. 1 is the flow chart of the numerical inversion analysis method based on structural stress monitoring result of the embodiment of the present invention；
Fig. 2 is the partial structure diagram in the ocean platform stress monitoring point region of the embodiment of the present invention.
Specific embodiment
Below according to attached drawing 1 and Fig. 2, presently preferred embodiments of the present invention is provided, and is described in detail, is enabled more preferable geographical
Solve function of the invention, feature.
Please refer to Fig. 1 and Fig. 2, a kind of numerical inversion analysis side based on structural stress monitoring result of the embodiment of the present invention
Method, comprising steps of
S1: selecting multiple stress monitoring points 2 on an ocean platform 1, is applied around local load in stress monitoring point 2
FLj, and survey calculation obtains the actual measurement structural stress changing value φ at stress monitoring point 2ij；I is less than or equal to stress monitoring point
The natural number of quantity；J is the natural number of local load's sum less than or equal to application.
In the present embodiment, in S1 step:
By way of integrated structure finite element analysis computation and site inspection, structural stress phase on ocean platform 1 is selected
Multiple positions higher to other positions are as stress monitoring point 2.
It keeps ocean platform 1 generally in static balance state, is applied around local load in stress monitoring point 2, measurement is each
Stress variation value at stress monitoring point 2 calculates according to stress variation value and obtains actual measurement structural stress changing value.
S2: selecting structure object simultaneously establishes finite element grid.
In the present embodiment, choosing the region in the distance range of three from 2 position of stress monitoring point purlin shelves is structure objects,
And finite element grid is established on ocean platform 1, finite element grid includes multiple grid cells, the distribution density of grid cell to
Direction far from stress monitoring point 2 is gradually sparse.
S3: an initial boundary load is applied to structure objects, and ocean platform is determined according to the stress of ocean platform 1
The Main way and load level of 1 boundary stress select an initial boundary load FB0。
S4: it calculates in initial boundary load FB0Under each stress monitoring point 2 actual measurement primary stress e0。
In the present embodiment, finite element grid and initial boundary load F are utilizedB0, calculate the stress for obtaining each stress monitoring point 2
e0。
S5: it is calculated according to a preset primary stress and the relational expression of structural stress changing value and obtains the change of theoretical construct stress
Change value；Parametric regression is carried out to the relational expression of primary stress and structural stress changing value, until theoretical construct stress variation value with
It is consistent to survey structural stress changing value, obtains the Primary Numerical model of the edge load of structure objects.
Parametric regression is carried out using relational expression of the intelligent optimization algorithm to primary stress and structural stress changing value.
Primary stress and the relational expression of structural stress changing value, which are provided with an error, allows the factor.
S6: examining and calibrates Primary Numerical model, obtains a final numerical model.
The stress of multiple ocean platforms 1 is randomly choosed, and carries out numerical value calculating using Primary Numerical model, and will meter
It calculates result to compare with measured result, examines and calibrate Primary Numerical model, obtain final numerical model.Intelligent optimization algorithm
It include: machine learning, genetic algorithm and neural network algorithm.
A kind of numerical inversion analysis method based on structural stress monitoring result of the embodiment of the present invention, can be according to calibration
Final numerical model easily calculates the initial stress state of stress monitoring point 2, mentions for the long term monitoring of 1 structure of ocean platform
For reference.
A kind of numerical inversion analysis method based on structural stress monitoring result of the embodiment of the present invention has following beneficial
Effect:
1, can be carried out in any military service stage (before construction, after building, lie up, stage of undocking etc.) of ocean platform 1, not by
Conventional method must lay the limitation of strain transducer before platform construction, and method is simple and convenient, collection period is short, will not be to platform
Construction impacts.
2, numerical value calculating and field measurement method both sides advantage are effectively played, the primary stress accuracy of measuring point is obtained
It is high.
The present invention has been described in detail with reference to the accompanying drawings, those skilled in the art can be according to upper
It states and bright many variations example is made to the present invention.Thus, certain details in embodiment should not constitute limitation of the invention, this
Invention will be using the range that the appended claims define as protection scope of the present invention.
Claims (9)
1. a kind of numerical inversion analysis method based on structural stress monitoring result, comprising steps of
S1: selecting multiple stress monitoring points on an ocean platform, is applied around local load in the stress monitoring point, and survey
Amount calculates the actual measurement structural stress changing value obtained at the stress monitoring point；
S2: selecting structure object simultaneously establishes finite element grid；
S3: an initial boundary load is applied to the structure objects, and according to the determination of the stress of the ocean platform
The Main way and load level of the boundary stress of ocean platform select an initial boundary load；
S4: the actual measurement primary stress of each stress monitoring point under the initial boundary load is calculated；
S5: it is calculated according to a preset primary stress and the relational expression of structural stress changing value and obtains theoretical construct stress variation
Value；Parametric regression is carried out to the relational expression of the primary stress and structural stress changing value, until the theoretical construct stress becomes
Change value is consistent with the actual measurement structural stress changing value, obtains the Primary Numerical model of the edge load of the structure objects；
S6: examining and calibrates the Primary Numerical model, obtains a final numerical model.
2. the numerical inversion analysis method according to claim 1 based on structural stress monitoring result, which is characterized in that institute
It states in S1 step:
By way of integrated structure finite element analysis computation and site inspection, it is opposite to select structural stress on the ocean platform
The higher multiple positions of other positions are as the stress monitoring point.
3. the numerical inversion analysis method according to claim 2 based on structural stress monitoring result, which is characterized in that institute
It states in S1 step, keeps the ocean platform generally in static balance state, be applied around local load in the stress monitoring point
Lotus measures the stress variation value at each stress monitoring point, is calculated according to the stress variation value and obtains the actual measurement structure
Stress variation value.
4. the numerical inversion analysis method according to claim 3 based on structural stress monitoring result, which is characterized in that institute
It states in S2 step:
The region chosen in the distance range of three from stress monitoring point position purlin shelves is the structure objects, and described
The finite element grid is established on ocean platform, the finite element grid includes multiple grid cells, point of the grid cell
Cloth density is gradually sparse to the direction far from the stress monitoring point.
5. the numerical inversion analysis method according to claim 4 based on structural stress monitoring result, which is characterized in that institute
It states in S4 step, using the finite element grid and the initial boundary load, calculates and obtain answering for each stress monitoring point
Power.
6. the numerical inversion analysis method according to claim 5 based on structural stress monitoring result, which is characterized in that institute
It states in S5 step, parameter is carried out using relational expression of the intelligent optimization algorithm to the primary stress and structural stress changing value and is returned
Return.
7. the numerical inversion analysis method according to claim 6 based on structural stress monitoring result, which is characterized in that institute
The relational expression for stating primary stress and structural stress changing value is provided with the error permission factor.
8. the numerical inversion analysis method according to claim 7 based on structural stress monitoring result, which is characterized in that institute
It states in S6 step, randomly chooses the stress of multiple ocean platforms, and carry out numerical value using the Primary Numerical model
It calculates, and calculated result and measured result is compared, examine and calibrate the Primary Numerical model, obtain the final number
It is worth model.
9. the numerical inversion analysis method according to claim 8 based on structural stress monitoring result, which is characterized in that institute
Stating intelligent optimization algorithm includes: machine learning, genetic algorithm and neural network algorithm.
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