CN112749502B - Regional virtual assembly lightweight method for oil-gas platform module - Google Patents
Regional virtual assembly lightweight method for oil-gas platform module Download PDFInfo
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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- G06T19/00—Manipulating 3D models or images for computer graphics
- G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
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- G06T2219/2008—Assembling, disassembling
Abstract
The invention discloses a regional virtual assembly lightweight method for an oil-gas platform module, which is characterized in that the oil-gas platform module is subjected to lightweight processing by dividing and combining the oil-gas platform module, some small-sized equipment and structures in the virtual assembly process are deleted, then information is extracted and restored through the oil-gas platform module to obtain a lightweight model, the lightweight model is subjected to discretization processing, and a virtual installation track of the oil-gas platform module is generated to guide the field assembly of the oil-gas platform module, so that the collision problem in the oil-gas platform assembly process is reduced. According to the invention, the oil-gas platform module is subjected to lightweight processing to obtain the virtual installation process of the oil-gas platform module, the configuration requirements of most computers can be met, the problems existing in the virtual assembly process can be found in time, and the assembly steps of the oil-gas platform module are optimized, so that the virtual assembly process is more fit with the actual installation process.
Description
Technical Field
The invention relates to a virtual assembly method, in particular to an optimization method for a virtual assembly process of a large-scale steel structure of an oil-gas module.
Background
Along with the technology integration level is higher and higher, the oil and gas platform module is larger and larger, and large-scale equipment and parts are more and more, so that the construction time is longer and longer, and the collision problem in the assembly process is more and more serious. The virtual assembly is an important component of large platform modular manufacturing, so that problems existing in the assembly can be found early, the assembly design and operability can be verified, and the assembly process can be displayed visually. At present, most three-dimensional design software cannot meet the requirement of virtual assembly of a large platform.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an oil-gas platform module regional virtual assembly lightweight method which can carry out lightweight processing on a modularized structure so as to carry out assembly track planning and simulation of the whole assembly process in general three-dimensional design software.
The invention discloses a regional virtual assembly lightweight method for an oil-gas platform module, which comprises the following steps of:
calling a module three-dimensional linear graph needing light weight in an oil gas module from a three-dimensional design model;
step two, establishing a bounding box space rectangular coordinate system o-xyz by taking a vertex below the left front side of the bounding box as an original point and three edge lines connected with the original point in a cuboid bounding box serving as a peripheral component of a three-dimensional linear graph of the module, wherein the right direction is the positive direction of an x axis, the upward direction is the positive direction of a z axis, and the backward direction is the positive direction of a y axis;
step three, partitioning and combining the module three-dimensional linear graphs, wherein the method comprises the following steps:
firstly, adjusting the side surface of a model three-dimensional linear graph opposite to a component to be lightened as a bottom surface, then establishing a rectangular coordinate system O by using a vertex point below the left front side of the bottom surface as an original point and three edge lines connected by the original point1-X1 Y1Z1Wherein rightward is X1Positive axial direction, upward Z1Positive axis, backward is Y1In the positive axial direction, the three-dimensional line pattern of the model is projected to X1O1Y1On a plane;
second, calculating the projection of each component to be lightened to X1O1Y1Area S on planexAnd marked as S according to the area size0、S1、S2、S3… … … Sx, and the corresponding labels of the components are 0-X, the projected area Sx of each component is divided by S0Obtaining an area ratio delta;
thirdly, judging the size of the area ratio delta, and deleting the part if the area ratio delta is less than or equal to 0.1; if δ > 0.1, retain the part;
the fourth step, respectively using the reserved components in X1O1Y1The vertexes of the projections on the plane are respectively made into parallel X1、Y1Parallel lines of the axes are used for establishing a rectangular containing box which surrounds the projection of each reserved part, the projection of each reserved part is converted into a standard rectangular structure, and the distance Y of the rectangular containing box is measured1The shortest axial distance is set to Δ LxMeasuring the distance X of the rectangular containing box1The shortest axial distance is set to Δ LyIf Δ Lx、△LyIs 0, Δ L is set by a value of half the length of the shortest side in each rectangular container boxx、△Ly，△Lx＝△Ly；
The fifth step, from left to right in sequence with interval Delta LxIs made parallel to Y1Cutting lines of the shaft from bottom to top at a spacing DeltaLyIs made parallel to X1Cutting line of shaft, cutting the whole X1O1Y1Dividing the plane into a standard grid structure;
numbering the standard grid structures, numbering the standard grid structures according to the marks of the parts corresponding to the rectangular containing boxes if the standard grid structures are in the rectangular containing boxes, and marking the standard grid structures as 0 if the standard grid structures are not in the rectangular containing boxes; the grid structure can not exist in two rectangular containing boxes at the same time, otherwise, the fourth step is returned again, and the delta L is resetxAnd Δ LyDividing the grid structure again, and repeating the sixth step until the numbering of the standard grid structure is completed;
seventhly, merging the grid structures with the same number, merging the grid structures from number 1 according to the number sequence of the rectangular containing boxes, merging the grid structure with the number 0 into the rectangular containing box number 1 if the peripheral grid structures are numbered as number 0 during merging, stopping merging the grid structure with the number 0 into the rectangular containing box when the grid structures are contacted with other numbered rectangular containing boxes or the grid structure with the number 0 fused into the rectangular containing box number 1 generates a non-rectangular structure in the merging process, merging the next numbered rectangular containing box until all the grid structures with the number 0 are merged into the corresponding rectangular containing box to obtain a newly divided rectangular containing box area;
step four, replacing the components in the region of each newly divided rectangular containing box obtained in the step three by a cuboid, wherein the length and the width of the cuboid are equal to those of the region of each newly divided rectangular containing box, and the height of the cuboid is the height from the highest point to the lowest point of the module three-dimensional line graph corresponding to the region of the newly divided rectangular containing box;
step five, establishing a rectangular solid space rectangular coordinate system as a positioning reference at each rectangular solid part, wherein the establishing method of each rectangular solid space rectangular coordinate system is as follows: a rectangular solid space rectangular coordinate system is established by taking a vertex below the left front side of the bottom surface of the rectangular solid as an origin and three edges connected with the vertex as x ', y' and z 'axes, wherein the x' axis is positive to the right, the z 'axis is positive upwards, and the y' axis is positive backwards;
sixthly, extracting characteristic information of each cuboid, wherein the characteristic information comprises the position, the size and the posture of the cuboid, and the cuboid characteristic extraction method comprises the following steps:
the rectangular solid space rectangular coordinate system has the space coordinate (x, y, z) of the original point under the bounding box coordinate system O, and the included angle alpha between the x' axis of the rectangular solid coordinate system and the x axis of the bounding box coordinate system; an included angle beta between the y axis of the rectangular coordinate system and the y' axis of the bounding box coordinate system; an included angle gamma between the z' axis of the rectangular coordinate system and the z axis of the bounding box coordinate system; the lengths a, b and c of three sides of the cuboid on the x ', y ' and z ' axes respectively form the characteristic information (x, y, z, alpha, beta, gamma, a, b and c) of the cuboid;
and seventhly, emptying the interior of the bounding box, reconstructing all cuboids according to the extracted characteristic information, and taking the reconstructed cuboid model as a lightweight model.
The method has the advantages that small-sized equipment and structures in the oil-gas platform module assembling process are deleted, so that the oil-gas platform module virtual assembling process is light, the configuration requirements of most computers can be met, problems existing in the virtual assembling process can be timely found, the oil-gas platform module assembling steps are optimized, and the virtual assembling process is more fit with the actual installing process.
Drawings
FIG. 1 is a three-dimensional line drawing of a module requiring light weighting in an oil and gas module;
FIG. 2 is a schematic view of a cuboid enclosure of peripheral components of a three-dimensional line drawing of a module;
FIG. 3 is a schematic diagram of a rectangular coordinate system established at the vertex of a three-dimensional line graph of a module;
FIG. 4 is a schematic view of a module three-dimensional line graph projected area marker;
FIG. 5 is a schematic diagram of a rectangular containing box established by the projection area of a three-dimensional line graph of a module;
FIG. 6 is a labeled diagram of standard grid structure partitioning of the projected area of the three-dimensional line graph of the module;
FIG. 7 is a schematic diagram of standard grid structure merging marks for a three-dimensional line graph projection area of a module;
FIG. 8 is a schematic diagram of the results of partitioning a three-dimensional line graph of a module;
FIG. 9 is a schematic diagram of the substitution results of the cuboid volume of the module;
FIG. 10 is a schematic diagram of a rectangular space coordinate system with modules in place of rectangular blocks;
FIG. 11 is a schematic diagram of information extraction of a module instead of a cuboid;
FIG. 12 is a schematic diagram of the weight reduction result of the three-dimensional line drawing of the module.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention discloses a regional virtual assembly light-weight method for an oil-gas platform module, which comprises the following steps of:
step one, as shown in figure 1, calling a module three-dimensional linear graph needing light weight in an oil gas module from a three-dimensional design model.
And step two, as shown in fig. 2, establishing a bounding box space rectangular coordinate system o-xyz by taking a vertex below the left front side of the bounding box as an original point and three edge lines connected with the original point on a rectangular bounding box 2 serving as a peripheral component of the module three-dimensional linear graph, wherein the right direction is the positive direction of an x axis, the upward direction is the positive direction of a z axis, and the backward direction is the positive direction of a y axis.
Step three, partitioning and combining the module three-dimensional linear graphs, wherein the method comprises the following steps:
first, as shown in fig. 3, a side surface of the model three-dimensional linear graph opposite to the component to be lightened is adjusted to be a bottom surface, then a rectangular coordinate system O is established with a vertex point below the left front side of the bottom surface as an origin and three edge lines connected with the origin1-X1Y1Z1Wherein rightward is X1Positive axial direction, upward Z1Positive axial direction, backward direction is Y1The positive direction of the axis. Projecting the three-dimensional line pattern of the model onto X1O1Y1On a plane;
second, as shown in FIG. 4, the projection of each part to be lightened onto X is calculated1O1Y1Area S on planexAnd marked as S according to the area size0、S1、S2、S3. . . . . . Sx, marking each component as 0-X correspondingly, and dividing the projection area Sx of each component by S0Obtaining an area ratio delta;
thirdly, judging the size of the area ratio delta, and deleting the part if the area ratio delta is less than or equal to 0.1 (the size of a judgment value is set according to the precision of the model); if δ > 0.1, the part is retained;
the fourth step, as shown in FIG. 5, is to leave each part at X1O1Y1The vertexes of the projections on the plane are respectively made into parallel X1、Y1Parallel lines of the axes are used for establishing a rectangular containing box which surrounds the projection of each reserved part, the projection of each reserved part is converted into a standard rectangular structure, and the distance Y of the rectangular containing box is measured1The shortest axial distance is set to Δ LxMeasuring the distance X of the rectangular containing box1The shortest axial distance is set to Δ LyIf Δ Lx、△LyIs 0, Δ L is set by a value of half the length of the shortest side in each rectangular container boxx、△Ly，△Lx＝△Ly；
The fifth step, from left to right in sequence with interval Delta LxIs made parallel to Y1Cutting lines of the shaft from bottom to top at a spacing DeltaLyIs made parallel to X1Cutting line of shaft, cutting the whole X1O1Y1The plane is divided into standard grid structures;
sixthly, numbering the standard grid structures as shown in FIG. 6, numbering the standard grid structures according to the marks of the parts corresponding to the rectangular containing boxes if the standard grid structures are in the rectangular containing boxes, and marking the standard grid structures as No. 0 if the standard grid structures are not in the rectangular containing boxes; the grid structure cannot exist in two rectangles at the same timeIn the container box, if not, returning to the fourth step again, selecting reset delta LxAnd Δ Ly(if selected to be 0.5 times DeltaLxAnd 0.5 times DeltaLy) Dividing the grid structure again, and repeating the sixth step until the numbering of the standard grid structure is completed;
seventhly, as shown in fig. 7-8, merging the grid structures with the same number, starting from number 1 to merge according to the number sequence of the rectangular containing boxes, merging if the number of the surrounding grid structures is number 0, merging the grid structure with the number 0 into the rectangular containing box number 1, stopping merging the grid structure with the number 0 into the rectangular containing box when the grid structures are contacted with other numbered rectangular containing boxes or the grid structure merged into the number 0 generates a non-rectangular structure in the merging process, merging the next numbered rectangular containing box until all the grid structures with the number 0 are merged into the corresponding rectangular containing box, and obtaining a newly divided rectangular containing box area;
and step four, replacing the components in each newly divided rectangular containing box region obtained in the step three by using a cuboid. The length and the width of the cuboid are equal to the length and the width of the area where each re-divided rectangular containing box is located, and the height of the cuboid is the height from the highest point to the lowest point of the module three-dimensional linear graph corresponding to the area where the re-divided rectangular containing box is located.
As shown in fig. 9, the highest point a, the lowest point a ' in the region 1, the highest point B, the lowest point B ', the highest point C and the lowest point C ' in the region 3 are the length and width of the cuboid, the upper surface of the cuboid reaches the highest point, the lower surface reaches the lowest point, and the cuboids 8, 9 and 10 are respectively established.
And fifthly, establishing a rectangular space coordinate system of the corresponding cuboid at each cuboid as a positioning reference. The rectangular coordinate system of each cuboid space is established by the following method: a rectangular parallelepiped space rectangular coordinate system is established by taking the vertex below the left front side of the bottom surface of the rectangular parallelepiped as an origin and three sides connected with the vertex as x ', y' and z 'axes, wherein the x' axis is positive to the right, the z 'axis is positive to the upward direction, and the y' axis is positive to the backward direction.
As shown in fig. 10, for the rectangular solid 8, a corresponding spatial rectangular coordinate system O' is established, and similarly to the rectangular solid 9, the rectangular solid 10 also establishes a corresponding spatial rectangular coordinate system.
And sixthly, extracting characteristic information of each cuboid. The feature information comprises the position, size and posture of the cuboid, and the cuboid feature extraction method comprises the following steps:
the rectangular solid space rectangular coordinate system has the space coordinate (x, y, z) of the original point under the bounding box coordinate system O, and the included angle alpha between the x' axis of the rectangular solid coordinate system and the x axis of the bounding box coordinate system; an included angle beta between the y axis of the rectangular coordinate system and the y' axis of the bounding box coordinate system; an included angle gamma between the z' axis of the rectangular coordinate system and the z axis of the bounding box coordinate system; the lengths a, b, c of the three sides of the rectangular parallelepiped on the x ', y ', z ' axes, respectively, form the characteristic information (x, y, z, α, β, γ, a, b, c) of the rectangular parallelepiped.
As shown in fig. 11, feature extraction is performed on the rectangular parallelepiped 8. Similarly, feature extraction is performed on the cuboid 9 and the cuboid 10.
And seventhly, emptying the interior of the bounding box, reconstructing all cuboids according to the extracted characteristic information, and taking the reconstructed cuboid model as a lightweight model. As shown in fig. 12, the module 11 is a final lightweight model, and the final lightweight model 11 is discretized to generate a virtual installation trajectory of the oil and gas platform module to guide the field assembly of the oil and gas platform module.
Claims (1)
1. The regional virtual assembly lightweight method for the oil and gas platform module is characterized by comprising the following steps of:
calling a module three-dimensional linear graph needing light weight in an oil gas module from a three-dimensional design model;
step two, establishing a bounding box space rectangular coordinate system o-xyz by taking a vertex below the left front side of the bounding box as an original point and three edge lines connected with the original point in a cuboid bounding box serving as a peripheral component of a three-dimensional linear graph of the module, wherein the right direction is the positive direction of an x axis, the upward direction is the positive direction of a z axis, and the backward direction is the positive direction of a y axis;
step three, partitioning and combining the module three-dimensional linear graphs, wherein the method comprises the following steps:
firstly, adjusting the side surface of a model three-dimensional linear graph opposite to a component to be lightened as a bottom surface, then establishing a rectangular coordinate system O by using a vertex point below the left front side of the bottom surface as an original point and three edge lines connected by the original point1-X1Y1Z1Wherein rightward is X1Positive axial direction, upward Z1Positive axial direction, backward direction is Y1In the positive axial direction, the three-dimensional line pattern of the model is projected to X1O1Y1On a plane;
second, calculate the projection of each part to be lightened to X1O1Y1Area S on planexAnd marked as S according to the area size0、S1、S2、S3… … … Sx, and the corresponding labels of the components are 0-X, the projected area Sx of each component is divided by S0Obtaining an area ratio delta;
thirdly, judging the size of the area ratio delta, and deleting the part if the area ratio delta is less than or equal to 0.1; if δ > 0.1, the part is retained;
the fourth step, respectively using the reserved components in X1O1Y1The vertexes of the projections on the plane are respectively made into parallel X1、Y1Parallel lines of the axes are used for establishing a rectangular containing box which surrounds the projection of each reserved part, the projection of each reserved part is converted into a standard rectangular structure, and the distance Y of the rectangular containing box is measured1The shortest axial distance is set to Δ LxMeasuring the distance X of the rectangular containing box1The shortest axial distance is set to Δ LyIf Δ Lx、△LyIs 0, Δ L is set by a value of half the length of the shortest side in each rectangular container boxx、△Ly，△Lx＝△Ly；
The fifth step, from left to right in sequence with interval Delta LxIs made parallel to Y1Cutting lines of the shaft from bottom to top at a spacing DeltaLyIs made parallel to X1Cutting line of shaft, cutting the whole X1O1Y1The plane is divided into standard grid structures;
numbering the standard grid structures, numbering the standard grid structures according to the marks of the parts corresponding to the rectangular containing boxes if the standard grid structures are in the rectangular containing boxes, and marking the standard grid structures as 0 if the standard grid structures are not in the rectangular containing boxes; the grid structure can not exist in two rectangular containing boxes at the same time, otherwise, the fourth step is returned again, and the delta L is resetxAnd Δ LyDividing the grid structure again, and repeating the sixth step until the numbering of the standard grid structure is completed;
seventhly, merging the grid structures with the same number, merging the grid structures from number 1 according to the number sequence of the rectangular containing boxes, merging the grid structure with the number 0 into the rectangular containing box number 1 if the peripheral grid structures are numbered as number 0 during merging, stopping merging the grid structure with the number 0 into the rectangular containing box when the grid structures are contacted with other numbered rectangular containing boxes or the grid structure with the number 0 fused into the rectangular containing box number 1 generates a non-rectangular structure in the merging process, merging the next numbered rectangular containing box until all the grid structures with the number 0 are merged into the corresponding rectangular containing box to obtain a newly divided rectangular containing box area;
step four, replacing the components in the region of each newly divided rectangular containing box obtained in the step three by a cuboid, wherein the length and the width of the cuboid are equal to those of the region of each newly divided rectangular containing box, and the height of the cuboid is the height from the highest point to the lowest point of the module three-dimensional line graph corresponding to the region of the newly divided rectangular containing box;
fifthly, establishing a rectangular space coordinate system as a positioning reference at each rectangular part, wherein the rectangular space coordinate system establishing method comprises the following steps: a rectangular solid space rectangular coordinate system is established by taking a vertex below the left front side of the bottom surface of the rectangular solid as an origin and three edges connected with the vertex as x ', y' and z 'axes, wherein the x' axis is positive to the right, the z 'axis is positive upwards, and the y' axis is positive backwards;
sixthly, extracting characteristic information of each cuboid, wherein the characteristic information comprises the position, the size and the posture of the cuboid, and the cuboid characteristic extraction method comprises the following steps:
the rectangular solid space rectangular coordinate system has the space coordinate (x, y, z) of the original point under the bounding box coordinate system O, and the included angle alpha between the x' axis of the rectangular solid coordinate system and the x axis of the bounding box coordinate system; an included angle beta between the y axis of the rectangular coordinate system and the y' axis of the bounding box coordinate system; an included angle gamma between the z' axis of the rectangular coordinate system and the z axis of the bounding box coordinate system; the lengths a, b and c of three sides of the cuboid on the x ', y ' and z ' axes respectively form the characteristic information (x, y, z, alpha, beta, gamma, a, b and c) of the cuboid;
and seventhly, emptying the interior of the bounding box, reconstructing all cuboids according to the extracted characteristic information, and taking the reconstructed cuboid model as a lightweight model.
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| CN109657387A (en) * | 2018-12-27 | 2019-04-19 | 重庆上丞科技有限公司 | A kind of household model orientation laying method based on mixed reality scene |
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| CN105469406B (en) * | 2015-11-30 | 2018-05-04 | 东北大学 | A kind of dummy object collision checking method based on bounding box and space division |
| CN105528494B (en) * | 2015-12-29 | 2019-02-22 | 上海大学 | Light weighed model based on three-dimensional cellular automaton generates and optimization method |
| CN109376383B (en) * | 2018-09-14 | 2022-09-30 | 长安大学 | Explosion view generation method based on collision detection |
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| CN106373193A (en) * | 2016-09-22 | 2017-02-01 | 河海大学 | Box covering method-based slope assembly type discrete element model generating method |
| CN109657387A (en) * | 2018-12-27 | 2019-04-19 | 重庆上丞科技有限公司 | A kind of household model orientation laying method based on mixed reality scene |
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