CN116127816A - Method for evaluating actual service state of gas tank based on laser point cloud mapping technology - Google Patents

Method for evaluating actual service state of gas tank based on laser point cloud mapping technology Download PDF

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CN116127816A
CN116127816A CN202310216371.2A CN202310216371A CN116127816A CN 116127816 A CN116127816 A CN 116127816A CN 202310216371 A CN202310216371 A CN 202310216371A CN 116127816 A CN116127816 A CN 116127816A
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structural
point cloud
gas tank
component
cloud data
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涂家琪
龚宗宜
张燎原
褚学征
彭起
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • 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]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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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    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
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    • G06T7/00—Image analysis
    • G06T7/60—Analysis of geometric attributes
    • G06T7/64—Analysis of geometric attributes of convexity or concavity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10028—Range image; Depth image; 3D point clouds

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Abstract

The invention discloses a method for evaluating the actual service state of a gas tank by adopting a laser point cloud mapping technology, which belongs to the technical field of building structure detection and comprises the following steps: the method comprises the steps of preprocessing laser point cloud data, classifying the point cloud data, extracting component-level point cloud data, calculating deformation degree of a structural component, building a finite element analysis model of a gas tank, calculating integral modes of the gas tank and analyzing stress of a limit state, and evaluating actual service state of the gas tank. The invention can calculate the deformation degree of the structural member in the gas tank, and utilizes the actual deformation state of the structure to carry out finite element analysis, thereby evaluating the integral actual service state of the gas tank and providing reliable guidance for the periodic maintenance of the gas tank and the replacement of the components.

Description

Method for evaluating actual service state of gas tank based on laser point cloud mapping technology
Technical Field
The invention belongs to the technical field of building structure detection, and particularly relates to a method for evaluating an actual service state of a gas tank based on a laser point cloud mapping technology.
Background
The gas tank generally adopts a cylindrical steel structure frame system, and a piston steel plate and a sealing rubber film are adopted in the gas tank to store gas generated in the metallurgical production process. The gas safety is one of the key points of production safety control, and once accidents occur, the whole metallurgical flow production is affected, so that huge economic property loss and even casualties are caused. The method has the advantages that the gas tank structural system is detected regularly by a comprehensive and accurate actual service state assessment means, the shutdown and production stoppage caused by local or whole structural failure are avoided, and the hidden danger of gas leakage is avoided.
The measurement of theodolite, total station, video and audio and the like and the real-time signal acquisition means can quantitatively record the change of a certain area of the gas tank through the measurement of fixed point positioning, but the service state of the whole structure system of the gas tank cannot be accurately evaluated in a short time, and an engineer is required to judge according to a simplified model and experience. The daily maintenance scheme of the gas tank lacks structural analysis guidance of a scientific system.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a method for evaluating the actual service state of a gas tank based on a laser point cloud mapping technology, which can completely and quantitatively describe and evaluate the whole stress state and the deformation condition of a component in the actual service state of the gas tank. The evaluation result can provide a reliable scheme for the periodical maintenance of the gas tank and the maintenance and replacement of components.
In order to achieve the above purpose, the invention provides a method for evaluating the actual service state of a gas tank based on a laser point cloud mapping technology, which comprises the following steps:
s1: preprocessing all laser point cloud data of a gas tank acquired by laser point cloud scanning equipment, removing redundant data such as figures, sundries, natural landscapes and the like which are irrelevant to a gas tank system, filtering by a bilateral filtering method, and removing outlier noise points generated by the acquisition equipment, on-site actual conditions and the like;
s2: dividing the preprocessed gas tank point cloud data into subsystems according to a structural system;
s3: performing component-level point cloud data extraction on main structural components in each subsystem, wherein the component types comprise: structural uprights, structural beams, structural supports, and structural panels;
s4: calculating the deformation degree of the structural members in each subsystem by utilizing the member point cloud data;
s5: building a finite element analysis model under the actual deformation state of the gas tank by utilizing the actual geometric shape and the spatial positioning of the extracted component;
s6: carrying out overall modal calculation under the actual deformation state of the gas tank and limit state stress calculation under the combination of multiple working conditions by utilizing a finite element analysis model;
s7: and comparing the structure model in the actual deformation state with the finite element calculation result of the original design model, and evaluating the actual service state of the gas tank.
In some alternative embodiments, the preprocessing of all laser point cloud data of a gas holder acquired by using a laser point cloud scanning device includes:
and the interference data is removed from all laser point cloud data, including unnecessary point cloud data such as figures, sundries, natural landscapes and the like which are irrelevant to a gas tank system, and outlier noise points generated due to acquisition equipment, on-site actual conditions and the like, and meanwhile, the characteristics such as curvature, thin walls and the like of the point cloud data of the gas tank structural system are reserved, so that the recognition of structural objects is easy.
In some alternative embodiments, step S2 comprises:
the preprocessed gas tank point cloud data is divided according to the structural system subsystems by manual intervention and selection, and the integrity of the data of the components in each subsystem is ensured at the junction of the divided subsystems, wherein the divided subsystems comprise: a top plate system, a side plate system, a bottom plate system and a piston system.
In some alternative embodiments, step S3 comprises:
the point cloud data extraction for structural uprights, structural beams, and structural supports includes: according to the preliminarily specified space range, reference end face and axis direction of the component, carrying out a plurality of section slices on the component, determining the section design parameters of the component, determining the final end face centroid, section size and axis direction of the component through optimization, and eliminating all incoherent data outside the geometric boundary range of the component;
for the extraction of structural panel point cloud data in a gas holder side plate system, comprising: according to the preliminarily determined space range of the structural plate, circular fitting of the outermost periphery and the innermost side outline of point cloud data is carried out, the radius and the circle center of the outermost periphery and the innermost side circle are determined, points with all X and Y coordinates in the X-Y plane range of the circular ring are all point cloud data of side plates in a gas tank side plate system, and all incoherent data outside the geometric boundary range of a component are removed; dividing the side plates of the gas tank into plates according to the size and the space positioning information in the design drawing, and obtaining the point cloud data of each splice plate;
extracting the point cloud data of the structural plate in the top plate system, the bottom plate system and the piston system of the gas tank, wherein the method comprises the following steps of: performing circular fitting of the outermost peripheral outline according to the preliminarily determined spatial range of the structural plate, wherein all points with X and Y coordinates within the circular X-Y plane range are all point cloud data belonging to a gas tank top plate, a gas tank bottom plate and a piston plate, and eliminating all incoherent data outside the geometric boundary range of the component; and dividing the structural plates into plates according to the size and the space positioning information in the design drawing, and obtaining the point cloud data of each splice plate.
In some alternative embodiments, step S4 comprises:
for deformation degrees of the structural upright post, the structural beam and the structural support, fitting a component axis through centroid coordinates of a section slice in the component axis direction, calculating the actual length of the component, calculating displacement and inclination rate of the component in three directions through deviation values of centroid coordinates of the other end section and centroid coordinates of a reference end surface, calculating maximum deflection of the component in three directions through deviation values of centroid coordinates of each section slice of the component and centroid coordinates of the reference end surface, and calculating local maximum bending values of each board surface of the component through comparison of the section slice and a standard design section;
and (3) for the deformation degree of the structural plate, performing space surface fitting of the plate surface on the selected reference surface, calculating the minimum distance from other points on the structural plate to the space surface, and subtracting the design thickness value of the plate from the maximum value of the distance corresponding to all points on the structural plate to obtain the maximum deflection value of the structural plate.
In some alternative embodiments, step S5 comprises:
all structural components of a top plate system, a side plate system, a bottom plate system and a piston system are built in a finite element analysis model, and the types and the number of the components, the end face positioning coordinates and the geometric shape of the components are consistent with the result of extracting laser point cloud data; the material of the component, the boundary condition setting of the end face and the coupling condition setting of the joint of the two components are kept consistent with the original designed finite element model, and the boundary condition can be estimated and set according to the degree of node rigidity degradation.
In some alternative embodiments, step S6 includes:
the limit state comprises a bearing capacity limit state, a normal use limit state and a durability limit state, and the stress calculation is carried out by adopting a linear elastic analysis method.
In some alternative embodiments, step S7 comprises:
comparing the structural model in the actual deformation state with the structural integral modal period value and the vibration mode change in the finite element calculation result of the original design model, the stress value of the member in the most unfavorable state and the stress maximum difference value of the member under different working conditions, and then combining the gradient, deflection and bending result of the member to give an actual service state evaluation report of the gas tank structural system.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
according to the invention, subsystem classification and component level data extraction are carried out on the on-site collected laser point cloud mapping data of the gas holder, so that the deformation degree of the main structural component of the gas holder is calculated and analyzed. And building a finite element model with actual deformation characteristics in finite element analysis software, carrying out structural integral mode calculation and stress calculation in a limit state, and carrying out actual service state assessment of the gas tank, wherein the evaluation comprises structural integral stress characteristic change, component stress strain state and deformation. The method can be used for describing and evaluating the whole stress state and the deformation condition of the component in the actual service state of the gas tank in a complete and quantitative mode. The evaluation result can provide a reliable scheme for the periodical maintenance of the gas tank and the maintenance and replacement of components.
Drawings
FIG. 1 is a flow chart of a gas tank service state evaluation method provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a gas tank structure system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the invention provides a gas holder service state evaluation method based on a laser point cloud mapping technology, which comprises the following steps:
the first step: all laser point cloud data of a gas tank acquired by adopting ground laser point cloud scanning equipment are preprocessed, redundant data such as figures, sundries, natural landscapes and the like irrelevant to a gas tank system are removed through manual intervention and selection, point cloud data are subjected to integral filtering through a bilateral filtering method, outlier noise points generated due to the acquisition equipment, on-site practical conditions and the like are removed, and the characteristics such as curvature and thin wall of the point cloud data are reserved.
And a second step of: and dividing the preprocessed point cloud data of the gas tank according to the subsystems of the structural system by manual intervention and selection, wherein the data division basis of each subsystem is the space occupation of the components in the subsystem. When the data is segmented, the junction of the subsystems should ensure the integrity of the component data in each subsystem. As shown in fig. 2, the subsystem includes a top plate system, a side plate system, a bottom plate system, and a piston system. The component system of each subsystem comprises the following components: the gas tank top plate system consists of a tank top beam, a tank top plate, a tank top ventilation cap and a leveling bracket; the gas tank side plate system consists of an upright post, a tank side plate and an anti-wind truss; the gas tank bottom plate system consists of a tank bottom plate; the piston system consists of a piston plate, a piston bracket, a T-shaped baffle bracket and a bracket at the lower part of the T-shaped baffle.
And a third step of: and extracting component-level point cloud data of main structural components in each subsystem, wherein the component types comprise structural upright posts, structural beams, structural supports and structural plates. The main component types of the roof system in each subsystem include: structural uprights, structural beams, structural supports, and structural panels; the main component types of the side panel system include: structural uprights, structural supports, and structural panels; the main component type of the bottom plate system is a structural plate; the main component types of piston systems include: structural uprights, structural beams, structural supports, and structural panels. The extraction steps of the various components comprise:
(1) Extracting point cloud data of a structural upright post, a structural beam and a structural support: (a) Preliminarily giving a space range of a component, and preliminarily filtering point cloud miscellaneous point data which do not belong to the component by adopting a bilateral filtering method; (b) Designating one end section of the member as an initial reference plane, and obtaining an initial axis normal line of the member in the length direction; (c) Obtaining the mean value and the mean square error of the outline shape and the size of the component through a plurality of section slices in the length direction of the component, comparing the mean square error with a standard component library, and confirming the design section parameters of the component; (d) The geometric dimension of the section slice in the length direction of the axis and the error of design parameters are minimum as optimization standards, the reference plane and the axis direction of the end faces of the component are adjusted, and the final directions of the end faces and the axis at the two ends of the component are determined; (e) And removing all irrelevant data outside the geometric boundary of the component through a clustering algorithm by the determined centroid, the cross-section size and the axis space direction of the end face of the component.
(2) Extracting point cloud data of a structural plate in a gas tank side plate system: (a) Eliminating point cloud data of the structural upright post and the structural support from point cloud data belonging to a side plate system; (b) Performing circular fitting on the rest data in the subsystem to determine the radius and the center of the outermost periphery and the innermost circular, wherein all the X and Y coordinates are points within the X-Y plane range of the circular ring, namely all point cloud data belonging to the side plate in the side plate system of the gas tank, and eliminating all incoherent data outside the geometric boundary range of the component; (c) And dividing the side plates of the gas tank into plates according to the size and the space positioning information in the design drawing, and obtaining the point cloud data of each splice plate.
(3) Extracting point cloud data of structural plates in a gas tank top plate system, a bottom plate system and a piston system: (a) Eliminating point cloud data of the structural upright post, the structural beam and the structural support from point cloud data belonging to a top plate system, a bottom plate system and a piston system; (b) Performing circular fitting of the outermost periphery outline, determining the radius and the circle center of the outermost periphery circle, and eliminating all incoherent data outside the geometric boundary range of the component, wherein all points of X and Y coordinates are in the X-Y plane range of the circle, namely all point cloud data belonging to the structural plate; (c) And dividing the structural plates into plates according to the size and the space positioning information in the design drawing, and obtaining the point cloud data of each splice plate.
Fourth step: and calculating the deformation degree of the main structural components extracted from each subsystem by utilizing the component point cloud data, wherein the calculation component types comprise: structural uprights, structural beams, structural supports, and structural panels. The deformation degree calculating step of each component comprises the following steps:
(1) Calculating deformation degrees of the structural upright post, the structural beam and the structural support: (a) Selecting one end of the two ends of the component, which has small Z-axis coordinates, as a reference end surface, cutting the component into sections in the axial length direction, wherein the number and the spacing of the sections are adjusted according to the sampling density, the interval between the sections is not less than 5cm and not more than 30cm, and the number of the sections is not less than 8; (b) Connecting the centroid coordinates of each section slice of the component, and carrying out axis fitting of the component, wherein the axis fitting is to sample Bezier curves more than twice; (c) calculating the actual length of the component based on the fitted axis; (d) Calculating displacement and inclination rates of the component in the X, Y, Z directions according to deviation values of the centroid coordinates of the cross section of the other end and the centroid coordinates of the reference end face; (e) Calculating the maximum deflection of the member in the X, Y, Z directions according to the deviation value of the centroid coordinates of each section slice of the member and the centroid coordinates of the reference end face; (f) And projecting each section slice to the reference end face in the axial direction, carrying out centroid alignment and angle correction on each section slice and the standard design section, projecting the section point cloud data to the nearest side of the standard design section, and determining the local maximum bending value of each plate surface of the component according to the projection distance.
(2) Calculation of the degree of deformation of the structural panel: (a) For a structural plate in a side plate system of the gas tank, selecting a plate surface positioned on one side of the inner side of the gas tank as a reference surface, for a top plate, a bottom plate of the gas tank and the structural plate in a piston system, selecting one side with a large Z-axis coordinate as the reference surface, and performing space surface fitting on point clouds on the reference surface; (b) And calculating the minimum distance from other points on the plate to the space curved surface, and subtracting the design thickness value of the plate from the maximum value of the distance corresponding to all points on the plate to obtain the maximum deflection value of the structural plate.
Fifth step: and constructing a finite element analysis model under the actual deformation state of the gas tank by utilizing the actual geometric shape and the spatial positioning of the extraction component. The components in the finite element analysis model comprise all components subjected to point cloud data processing in a top plate system, a side plate system, a bottom plate system and a piston system. For the finite element model in the actual deformation state, the type and the number of the components, the end face positioning coordinates and the geometric shape of the components are consistent with the result of extracting the laser point cloud data: the condition can be ensured by carrying out triangle mesh materialization on the component-level point cloud data processed in the fourth step and importing finite element analysis software. The material of the component, the boundary condition setting of the end face and the coupling condition setting of the joint of the two components can be kept consistent with the original designed finite element model, and the boundary condition can be estimated and set according to the degree of node rigidity degradation.
Sixth step: and carrying out integral modal calculation of the gas tank and limit state stress calculation under multiple working condition combinations by using the built finite element analysis model. The limit states comprise a bearing capacity limit state, a normal use limit state and a durability limit state, and the stress calculation is carried out by adopting a linear elastic analysis method.
Seventh step: comparing the structure model in the actual deformation state with the finite element calculation result of the original design model, and evaluating the actual service state of the gas tank, including the actual service state of the whole structure and the stress strain level of the component, including: the method comprises the steps of finding out a region and a subsystem with larger vibration mode change according to the period value and vibration mode change of the integral mode of the structure; the stress value of the component in the most unfavorable state is compared with the standard design value, and the percentage of the maximum stress value to the standard design value is calculated; and calculating the maximum stress difference value of the component under different working conditions, comparing the maximum stress difference value with the minimum stress value, and calculating the multiple relation between the maximum stress difference value and the minimum stress value. And the analysis results are combined with the inclination, deflection and bending results of various components to give an actual service state evaluation report of the gas tank structure system.
The invention provides a gas tank actual service state assessment method based on a laser point cloud mapping technology. The evaluation result obtained by the method can provide a reliable scheme for the periodical integral maintenance and the maintenance and replacement of parts of the gas tank, and has wide application prospect in the detection field of existing industrial building structures.
It should be noted that each step/component described in the present application may be split into more steps/components, or two or more steps/components or part of the operations of the steps/components may be combined into new steps/components, as needed for implementation, to achieve the object of the present invention.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (8)

1. The method for evaluating the actual service state of the gas tank based on the laser point cloud mapping technology is characterized by comprising the following steps of:
s1: preprocessing all laser point cloud data of the acquired gas tank, removing data irrelevant to a gas tank system, and filtering to remove outlier noise points;
s2: dividing the preprocessed gas tank point cloud data into subsystems according to a structural system;
s3: extracting component-level point cloud data of main structural components in each subsystem to obtain component point cloud data, wherein the component type comprises: structural uprights, structural beams, structural supports, and structural panels;
s4: calculating the deformation degree of the structural members in each subsystem by utilizing the member point cloud data;
s5: building a finite element analysis model under the actual deformation state of the gas tank by utilizing the actual geometric shape and the spatial positioning of the extracted component;
s6: carrying out overall modal calculation under the actual deformation state of the gas tank and limit state stress calculation under the combination of multiple working conditions by utilizing a finite element analysis model;
s7: and comparing the finite element analysis model in the actual deformation state with the finite element calculation result of the original design model, and evaluating the actual service state of the gas tank.
2. The method of claim 1, wherein preprocessing the collected complete laser point cloud data of the gas holder comprises:
and interference data is removed from all laser point cloud data, including point cloud data irrelevant to a gas tank system and outlier noise points, and meanwhile, the characteristics of curvature and thin wall of the point cloud data in the gas tank structure system are reserved, so that the identification of structural objects is easy.
3. The method according to claim 2, wherein step S2 comprises:
the preprocessed gas tank point cloud data is divided according to the structural system subsystems by manual intervention and selection, and the integrity of the data of the components in each subsystem is ensured at the junction of the divided subsystems, wherein the divided subsystems comprise: a top plate system, a side plate system, a bottom plate system and a piston system.
4. A method according to claim 3, wherein step S3 comprises:
the point cloud data extraction for structural uprights, structural beams, and structural supports includes: according to the preliminarily specified space range, reference end face and axis direction of the component, carrying out a plurality of section slices on the component, determining the section design parameters of the component, determining the final end face centroid, section size and axis direction of the component through optimization, and eliminating all incoherent data outside the geometric boundary range of the component;
for the extraction of structural panel point cloud data in a gas holder side plate system, comprising: according to the preliminarily determined space range of the structural plate, circular fitting of the outermost periphery and the innermost side outline of the point cloud data is carried out, the radius and the circle center of the outermost periphery and the innermost side circle are determined, all points with X and Y coordinates in the range of the circular X-Y plane are points belonging to all point cloud data of a side plate in a gas tank side plate system, and all incoherent data outside the geometric boundary range of a component are removed; dividing the side plates of the gas tank into plates according to the size and the space positioning information in the design drawing, and obtaining the point cloud data of each splice plate;
extracting the point cloud data of the structural plate in the top plate system, the bottom plate system and the piston system of the gas tank, wherein the method comprises the following steps of: performing circular fitting of the outermost peripheral outline according to the preliminarily determined spatial range of the structural plate, wherein all points with X and Y coordinates within the circular X-Y plane range are all point cloud data belonging to a gas tank top plate, a gas tank bottom plate and a piston plate, and eliminating all incoherent data outside the geometric boundary range of the component; and dividing the structural plates into plates according to the size and the space positioning information in the design drawing, and obtaining the point cloud data of each splice plate.
5. The method according to claim 4, wherein step S4 comprises:
for deformation degrees of the structural upright post, the structural beam and the structural support, fitting a component axis through centroid coordinates of a section slice in the component axis direction, calculating the actual length of the component, calculating displacement and inclination rate of the component in three directions through deviation values of centroid coordinates of the other end section and centroid coordinates of a reference end surface, calculating maximum deflection of the component in three directions through deviation values of centroid coordinates of each section slice of the component and centroid coordinates of the reference end surface, and calculating local maximum bending values of each board surface of the component through comparison of the section slice and a standard design section;
and (3) for the deformation degree of the structural plate, performing space surface fitting of the plate surface on the selected reference surface, calculating the minimum distance from other points on the structural plate to the space surface, and subtracting the design thickness value of the plate from the maximum value of the distance corresponding to all points on the structural plate to obtain the maximum deflection value of the structural plate.
6. The method according to claim 5, wherein step S5 comprises:
all structural components of a top plate system, a side plate system, a bottom plate system and a piston system are built in a finite element analysis model, and the types and the number of the components, the end face positioning coordinates and the geometric shape of the components are consistent with the result of extracting laser point cloud data; the material of the component, the boundary condition setting of the end face and the coupling condition setting of the joint of the two components are kept consistent with the original designed finite element model, and the boundary condition is estimated and set according to the degree of node rigidity degradation.
7. The method according to claim 6, wherein in step S6, the limit state includes a load capacity limit state, a normal use limit state and a durability limit state, and the stress calculation is performed using a linear elastic analysis method.
8. The method of claim 7, wherein step S7 includes:
comparing the structural model in the actual deformation state with the structural integral modal period value and the vibration mode change in the finite element calculation result of the original design model, the stress value of the member in the most unfavorable state and the stress maximum difference value of the member under different working conditions, and then combining the gradient, deflection and bending result of the member to give an actual service state evaluation report of the gas tank structural system.
CN202310216371.2A 2023-03-07 2023-03-07 Method for evaluating actual service state of gas tank based on laser point cloud mapping technology Pending CN116127816A (en)

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CN117574687A (en) * 2024-01-15 2024-02-20 垒知科技集团有限公司 Piston operation simulation method in gas tank construction

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117574687A (en) * 2024-01-15 2024-02-20 垒知科技集团有限公司 Piston operation simulation method in gas tank construction
CN117574687B (en) * 2024-01-15 2024-04-02 垒知科技集团有限公司 Piston operation simulation method in gas tank construction

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