CN111429578A - Three-dimensional model generation method and three-dimensional virtual maintenance system for thermal power plant unit - Google Patents
Three-dimensional model generation method and three-dimensional virtual maintenance system for thermal power plant unit Download PDFInfo
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- CN111429578A CN111429578A CN202010216258.0A CN202010216258A CN111429578A CN 111429578 A CN111429578 A CN 111429578A CN 202010216258 A CN202010216258 A CN 202010216258A CN 111429578 A CN111429578 A CN 111429578A
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- 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
- G06T17/10—Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/10—Geometric effects
- G06T15/20—Perspective computation
- G06T15/205—Image-based rendering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention provides a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit, wherein the three-dimensional model generation method comprises the following steps: generating point cloud data of a thermal power plant unit by adopting a three-dimensional laser scanner; generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data; acquiring a photo of a thermal power plant unit; film pasting is carried out on the three-dimensional structure model according to the picture, and a three-dimensional model after film pasting is generated; rendering the three-dimensional model after film pasting by adopting a multi-detail level technology and a dynamic shielding and removing technology to generate a rendered three-dimensional model; and displaying the rendered three-dimensional model by adopting an image quality self-adaption technology. According to the method, a three-dimensional model is generated by reverse engineering, a photo is used for film pasting, a visual and visual three-dimensional equipment model is established, the model is rendered by adopting a multi-detail level technology and a dynamic shielding and removing technology, and is displayed by adopting an image quality self-adaption technology, so that the running speed of the three-dimensional model is increased, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of unit modeling, in particular to a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit.
Background
At present, the three-dimensional overhaul simulation technology is still in a starting stage in a thermal power plant, and the defects of poor field immersion, insufficient intelligence of an assembly scene, insufficient friendliness of an interaction interface, insufficient functions of a system and the like exist mostly.
Disclosure of Invention
The invention aims to provide a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit, so as to establish a visual and visual three-dimensional equipment model, improve the functions of the three-dimensional virtual maintenance system and improve the user experience.
In order to achieve the purpose, the invention provides the following scheme:
a three-dimensional model generation method for a thermal power plant unit comprises the following steps:
generating point cloud data of a thermal power plant unit by adopting a three-dimensional laser scanner;
generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data;
acquiring a photo of a thermal power plant unit;
film pasting is carried out on the three-dimensional structure model according to the picture, and a three-dimensional model after film pasting is generated;
rendering the three-dimensional model after film pasting by adopting a multi-detail level technology and a dynamic shielding and removing technology to generate a rendered three-dimensional model;
and displaying the rendered three-dimensional model by adopting an image quality self-adaption technology.
Optionally, the generating a three-dimensional model of a thermal power plant unit according to the point cloud data by using a reverse engineering technology further includes:
and generating the internal structure of the three-dimensional model of the thermal power plant unit by adopting a drawing modeling mode according to the drawing of the thermal power plant unit.
Optionally, the rendering is performed on the three-dimensional model after the film is attached by using a multi-detail level technology and a dynamic occlusion rejection technology, and the generated rendered three-dimensional model specifically includes:
based on a multi-detail level technology, calculating the distance of a camera in real time according to the current observation visual angle of a user, when the distance of the camera is greater than a preset threshold value, identifying the appearance of the equipment by using a three-dimensional model with a first surface number, and when the distance of the camera is not greater than the preset threshold value, identifying the appearance of the equipment by using a three-dimensional model with a second surface number, wherein the second surface number is greater than the first surface number;
based on a dynamic occlusion rejection technology, the angle of the camera is calculated in real time according to the current observation visual angle of a user, the occluded structure inside the three-dimensional model is determined according to the angle calculation result, and the rendering of the occluded structure inside is stopped.
A three-dimensional virtual overhaul system of a thermal power plant unit, the three-dimensional virtual overhaul system comprising: a basic data layer, a three-dimensional scene layer and a three-dimensional application layer;
the basic data layer is used for generating a three-dimensional model of the thermal power plant unit by adopting a three-dimensional model generation method of the thermal power plant unit according to point cloud data of the thermal power plant unit generated by the three-dimensional laser scanner, and generating service data according to technical data of the thermal power plant unit; the technical data comprises a system flow chart, a design document, a process principle description, a material, a drawing, operation and maintenance rules and an expert knowledge base document;
the three-dimensional scene layer is used for hanging the service data on the three-dimensional model to generate a three-dimensional scene containing the service data;
the application layer is used for interacting with the user in an interactive roaming mode.
Optionally, the three-dimensional scene containing the service data includes a set-level scene, a system-level scene, and an equipment-level scene;
the unit level scene comprises buildings and steel structures in a production area of a power plant, a unit equipment structure and connecting pipelines among the unit equipment;
the system level scene comprises the spatial distribution of the unit equipment, the arrangement of connecting pipelines among the unit equipment and the positions of valves;
the equipment level scene comprises models of the parts of the unit equipment, free visual angle switching models of the parts of the unit equipment and exploded views of the parts of the unit equipment.
Optionally, the application layer includes a structure principle learning module, an overhaul process learning module, and a typical fault learning module;
the structure principle learning module is used for displaying the composition structure and the working principle of the unit equipment according to a user instruction;
the maintenance process learning module is used for simulating the maintenance process of the unit equipment according to the user instruction;
the typical fault learning module is used for demonstrating fault phenomena by using the effect of a three-dimensional scene of the unit equipment according to a user instruction.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit, wherein the three-dimensional model generation method comprises the following steps: generating point cloud data of a thermal power plant unit by adopting a three-dimensional laser scanner; generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data; acquiring a photo of a thermal power plant unit; film pasting is carried out on the three-dimensional structure model according to the picture, and a three-dimensional model after film pasting is generated; rendering the three-dimensional model after film pasting by adopting a multi-detail level technology and a dynamic shielding and removing technology to generate a rendered three-dimensional model; and displaying the rendered three-dimensional model by adopting an image quality self-adaption technology. According to the method, a three-dimensional model is generated by reverse engineering, a photo is used for film pasting, a visual and visual three-dimensional equipment model is established, the model is rendered by adopting a multi-detail level technology and a dynamic shielding and removing technology, and is displayed by adopting an image quality self-adaption technology, so that the running speed of the three-dimensional model is increased, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a three-dimensional model generation method for a thermal power plant unit according to the present invention;
fig. 2 is a structural diagram of a three-dimensional virtual maintenance system of a thermal power plant unit according to the present invention;
fig. 3 is a structural composition diagram of an application layer of the three-dimensional virtual overhaul system of the thermal power plant unit provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit, so as to establish a visual and visual three-dimensional equipment model, improve the functions of the three-dimensional virtual maintenance system and improve the user experience.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In order to achieve the purpose, the invention combines multiple visualization technologies such as data visualization, reverse engineering, Virtual Reality (VR) and the like to construct a three-dimensional model so as to form a maintenance training platform of million units. And establishing a three-dimensional equipment model base, an overhaul rule knowledge base and an evaluation knowledge base with visual images, and realizing the interactive application of integration of overhaul training, drilling and evaluation of the power plant. The bottleneck that the original power plant can only carry out operation simulation training is broken through, the way of training the overhaul skills of workers is expanded, and the operation skills of the overhaul workers are improved and evaluated.
The method specifically comprises the following steps: as shown in fig. 1, the present invention provides a three-dimensional model generation method for a thermal power plant unit, where the three-dimensional model generation method includes the following steps:
generating point cloud data of a thermal power plant unit by adopting a three-dimensional laser scanner;
and generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data. And generating the internal structure of the three-dimensional model of the thermal power plant unit by adopting a drawing modeling mode according to the drawing of the thermal power plant unit.
The method specifically comprises the following steps: the three-dimensional model building process of the invention uses a reverse engineering technology. And performing design technology reproduction on the built assets through reverse engineering, wherein the model required by the three-dimensional virtual training system is obtained through the reverse engineering. The original data used in reverse engineering are laser scanning point clouds, drawings and photographs.
The model obtained by the laser scanning method can ensure the consistency of the model and the field by rescanning no matter the difference between the design model provided by a design institute or a manufacturer and the finished state or the modification of equipment in the operation of a power plant. The scanning point clouds in different periods are used as historical data and can also be used as a basis for judging the change of the asset state. The equipment which has the requirement on model precision and can provide scanning conditions on site is recommended to be modeled by using a laser scanning mode. For places (such as underground, inside equipment) which cannot be reached by laser scanning, drawing modeling is used as a supplement.
And acquiring a picture of the thermal power plant unit.
And pasting the three-dimensional structure model according to the picture to generate a three-dimensional model after pasting.
And rendering the three-dimensional model after the film is pasted by adopting a multi-detail level technology and a dynamic shielding and removing technology to generate the rendered three-dimensional model.
Specifically, in order to ensure the efficiency of using a three-dimensional system by a common office computer of a power plant user, a model lightweight technology, such as Dynamic OC, L events of Detail, image quality self-adaption and the like, is adopted, and the number of triangular surfaces which are rendered by controlling a single device at the same time is as low as possible.
L OD (L events of Detail) technology can determine the resource allocation of object rendering according to the position and importance of the node of the object model in the display environment, and reduce the face number and Detail of the non-important object, thereby obtaining high-efficiency rendering operation.
Dynamic Occlusion Culling (Occlusion Culling) is an optimization measure that improves performance by avoiding rendering geometric faces that face away from the viewer.
For the three-dimensional virtual maintenance model, the angle of the camera is calculated in real time according to the current observation visual angle of a user, the rendering of the shielded structure inside the equipment can be automatically stopped, and when the camera rotates, the internal structure is gradually displayed according to the real-time calculation result, so that the effect of improving the overall rendering speed is achieved.
And displaying the rendered three-dimensional model by adopting an image quality self-adaption technology.
The method specifically comprises the following steps: and automatically adjusting the image quality according to the used client hardware. The display device can ensure a better display effect on high-performance equipment and can smoothly run on equipment with poor performance.
As shown in fig. 2, the present invention further provides a three-dimensional virtual maintenance system for a power plant unit, where the three-dimensional virtual maintenance system includes: a basic data layer, a three-dimensional scene layer and a three-dimensional application layer;
the basic data layer is used for generating a three-dimensional model of the thermal power plant unit by adopting a three-dimensional model generation method of the thermal power plant unit according to point cloud data of the thermal power plant unit generated by the three-dimensional laser scanner, and generating service data according to technical data of the thermal power plant unit; the technical data comprises a system flow chart, a design document, a process principle description, a material, a drawing, operation and maintenance rules and an expert knowledge base document; specifically, the work of field real objects and the work of converting unstructured data into standard three-dimensional models and structured data are mainly completed in a data layer. The basic data comprises point cloud data generated by the three-dimensional laser scanner, a system flow chart, design documents, process principle descriptions, materials, drawings, operation and maintenance rules, expert knowledge base documents and the like. And obtaining a standard format three-dimensional model and various static and dynamic service data meeting the system requirements through reverse engineering and standardization work.
The three-dimensional modeling data scheme aims to abstract and sort a large amount of field real objects and unstructured data of the power plant to obtain data meeting modeling requirements. The input to the process is raw data and the output is three-dimensional modeling data.
First, for a device that needs to realize three-dimensional modeling, the following raw data are collected according to specific conditions in the field as shown in table 1.
TABLE 1 original data sheet for three-dimensional modeling
When original data are collected, the basic principle is that parts needing to be represented in the overhaul process at least need one item of drawing, photo and point cloud data to ensure that equipment modeling can be carried out. If the conditions allow, the variety of the materials should be as much as possible, so that the modeling efficiency can be improved and the accuracy of the model size can be ensured.
The three-dimensional modeling process of the invention is based on drawings and point clouds, and combines pictures and related documents of equipment, and uses modeling tools (CAD, 3DMAX, SolidWorks, etc.) to complete wire frame models and chartlets. According to the requirement of three-dimensional operation guidance, special effects are added to the part which needs to express the working principle and the disassembling step. The model output format is FBX. The indices of the three-dimensional model of the present invention are shown in table 2:
TABLE 2 indices of three-dimensional models
In order to ensure the efficiency of using a three-dimensional model by an office computer of a power plant, a model lightweight technology, namely Dynamic OC (Dynamic occlusion rejection) and L evels of Detail, is adopted, on the premise of ensuring the availability of a product model, original model data are compressed, filtered and optimized so as to reduce the scale of the model, reduce the use amount of a memory and accelerate the display speed, the number of triangular surfaces which are rendered by a single device at the same time is controlled not to exceed 100 ten thousand, and the operation parameters of the standardized model are shown in table 3.
TABLE 3 operating parameters after model normalization
| Item | Standard of merit |
| Model files | A wire frame model: less than 10MB |
| Load time | <30s |
| Speed of operation | FPS>30 |
The three-dimensional scene layer is used for hanging the service data on the three-dimensional model to generate a three-dimensional scene containing the service data; specifically, the three-dimensional scene layer is responsible for configuring the standardized data into a three-dimensional scene containing business data. The three-dimensional scene containing the service data comprises a machine set level scene, a system level scene and an equipment level scene; the unit level scene comprises buildings and steel structures in a production area of a power plant, a unit equipment structure and connecting pipelines among the unit equipment; the system level scene comprises the spatial distribution of the unit equipment, the arrangement of connecting pipelines among the unit equipment and the positions of valves; the equipment level scene comprises models of the parts of the unit equipment, free visual angle switching models of the parts of the unit equipment and exploded views of the parts of the unit equipment. Specifically, in order to guarantee rendering efficiency, the power plant is divided into three levels of scenes: a unit level scene, a system level scene, and an equipment level scene. The unit level scene reflects the buildings and steel structures of the production area of the power plant, the main design and the connecting pipelines of the unit represent all the component systems of the unit, and the component systems are represented as an organic whole. The system level scene mainly reflects the spatial distribution of the equipment, the arrangement of the pipelines and the positions of the valves. The system level scene and the two-dimensional flow chart can generate sharp contrast, and a real production field can be intuitively felt. The equipment level scene reflects the fine modeling of the component level, free visual angle switching and decomposition view, and can check each part and detail of the equipment.
The application layer is used for interacting with the user in an interactive roaming mode.
The application layer comprises a structure principle learning module, an overhaul process learning module and a typical fault learning module; the structure principle learning module is used for displaying the composition structure and the working principle of the unit equipment according to a user instruction; the maintenance process learning module is used for simulating the maintenance process of the unit equipment according to the user instruction; the typical fault learning module is used for demonstrating fault phenomena by using the effect of a three-dimensional scene of the unit equipment according to a user instruction.
Specifically, the scheme of the three-dimensional virtual overhaul functional module is to select a proper three-dimensional engine and realize all preset functions of the system through secondary development. The input of the process is a standardized model and data, and the output is a three-dimensional virtual maintenance system. And performing secondary development based on Unity3D, manufacturing a three-dimensional scene editor which accords with equipment simulation maintenance, customizing UI and interactive actions in a configuration mode, rapidly expanding according to new requirements, forming a resource library, and efficiently finishing complex interface configuration and three-dimensional application. As shown in fig. 3, the application layer of the present invention includes three functional modules: the system comprises a structure principle learning module, an overhaul process learning module and a typical fault learning module. The structure principle learning module: the method comprises the functions of part tree diagram, explosion diagram decomposition, working principle demonstration and the like, and the composition structure and the working principle of one device are comprehensively introduced. A maintenance process module: and the caption, audio and animation are comprehensively utilized, related documents are hung, and the whole overhaul process is demonstrated. The user can simulate the whole process of one-time overhaul, including preparation before overhaul, disassembly sequence, quality inspection point content and standard and the like. A typical fault learning module: typical faults of each device are classified and sorted according to fault phenomena, fault reasons and prevention treatment, and the fault phenomena are visually demonstrated by utilizing various effects of a three-dimensional scene.
As shown in fig. 3, the application layer of the present invention includes a login page, and the login page of the present invention includes: the login window is used for inputting a user name and a password and detecting the legal identity of the user. The help button is used for popping up a help document, and the contents of function menu introduction, an operation method, common troubleshooting and the like are recorded on the help button.
The application layer of the invention also comprises a device selection page, the device selection page lists the factory floor schematic diagram and all the selectable devices, the introduction characters of the selected devices are clicked and displayed for the first time, the space directions of the devices are marked on the factory floor schematic diagram, and the corresponding device scenes are clicked and entered for the second time.
The application layer of the present invention further includes a structural principle learning module (structural principle module in fig. 3), which includes:
device component object tree: in the structure display state, the device component object tree is displayed. Clicking a radio box in front of the object name to control the display and the hiding of the object model; clicking an expansion button behind the object name to control the expansion and the contraction of the object tree; clicking the object name, and highlighting a prompt of a corresponding model; double-clicking on the object name focuses the lens on the three-dimensional model of the object.
Explosion diagram: and in the structure display state, the explosion diagram button is clicked to control the explosion and recovery states of the equipment, and in the explosion diagram mode, all operations of the object tree are still effective.
And (3) label display: and in the structure display state, the display and the hiding of the label are controlled by clicking the label button.
And (3) scene interaction function: in the structure display state, clicking the model to highlight the prompt, displaying the text introduction and the voice reading of the part at the same time, and pointing the object tree cursor to the object; double-click on the model, the lens focuses the object centrally. And clicking a right button to cancel the selected state.
Principle display: the working principle, technical parameters, operation guide and the like of the equipment are listed, and the corresponding menu is clicked to start the demonstration.
The application layer of the present invention further comprises a repair process learning module (repair process module in fig. 3). the repair process learning module of the present invention comprises:
maintenance process status bar: the maintenance process status bar displays the following contents: the stage division of the maintenance operation and the position of the current step; the name of the current step; the positions of the quality specimen system point, the quality guarantee system point and the overhaul recording point; and controlling the forward and backward of the step.
And (3) maintenance step demonstration: the sequence number of the step is attached to an object model needing to be operated in the step, and relevant characters and state prompts are displayed when the mouse is suspended; the steps that have been performed are shown in gray and the steps that have not been performed are shown in white; the demonstration modes of the steps comprise subtitles, animations, voice, video, pictures and the like.
Evaluation mode: in the evaluation mode, the step serial numbers are not displayed any more, a user must click the current step serial number in the correct sequence, the step is normally demonstrated when the click is correct, and the system records and prompts the user of an operation error when the click is wrong until the correct step is clicked.
Examination questions: after the examination questions are clicked, the system automatically extracts a plurality of questions from the question bank of the equipment, the question stems are displayed in a mode of combining text description and three-dimensional scenes, the question types are objective questions, the user automatically enters the next question after selecting the answers, all answers are finished, the system gives correct answers and judges the answers of the user.
The application layer of the invention also comprises a typical fault learning module, and the typical fault module of the invention has the main functions of classifying and sorting typical faults of each device according to fault phenomena, fault reasons and prevention treatment and visually demonstrating the fault phenomena by utilizing various effects of a three-dimensional scene.
In the virtual environment, due to the interaction of the user and the motion of the objects, the objects are likely to collide with each other frequently, and at this time, in order to maintain the reality of the environment, the collisions need to be detected in time, corresponding collision reactions are calculated, and the drawing result is updated, so that the penetration phenomenon between the objects is prevented, and the reality of the virtual environment and the immersion of the user are damaged. The interactive roaming user can flexibly and accurately carry out omnibearing observation on the visual scene, pick up the virtual object in the visual scene and inquire information. The interactive roaming process is a process of continuously changing the viewpoint position or the sight direction and rendering the view according to the interactive control command.
Documents, drawings, photos and videos related to overhaul can be hung in each interaction step, and a user can conveniently look up references at any time. When the data is updated, the user can modify the configuration file by himself to perform addition and deletion modification.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit, wherein the three-dimensional model generation method comprises the following steps: generating point cloud data of a thermal power plant unit by adopting a three-dimensional laser scanner; generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data; acquiring a photo of a thermal power plant unit; film pasting is carried out on the three-dimensional structure model according to the picture, and a three-dimensional model after film pasting is generated; rendering the three-dimensional model after film pasting by adopting a multi-detail level technology and a dynamic shielding and removing technology to generate a rendered three-dimensional model; and displaying the rendered three-dimensional model by adopting an image quality self-adaption technology. According to the method, a three-dimensional model is generated by reverse engineering, a photo is used for film pasting, a visual and visual three-dimensional equipment model is established, the model is rendered by adopting a multi-detail level technology and a dynamic shielding and removing technology, and is displayed by adopting an image quality self-adaption technology, so that the running speed of the three-dimensional model is increased, and the user experience is improved.
The invention comprehensively utilizes reverse engineering to restore the field equipment into high-precision three-dimensional simulation, and secondarily develops a modeling tool and a three-dimensional engine to cooperate with efficient development and configuration of maintenance simulation functions.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A three-dimensional model generation method for a thermal power plant unit is characterized by comprising the following steps:
generating point cloud data of a thermal power plant unit by adopting a three-dimensional laser scanner;
generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data;
acquiring a photo of a thermal power plant unit;
film pasting is carried out on the three-dimensional structure model according to the picture, and a three-dimensional model after film pasting is generated;
rendering the three-dimensional model after film pasting by adopting a multi-detail level technology and a dynamic shielding and removing technology to generate a rendered three-dimensional model;
and displaying the rendered three-dimensional model by adopting an image quality self-adaption technology.
2. The method for generating the three-dimensional model of the thermal power plant unit according to claim 1, wherein the generating the three-dimensional model of the thermal power plant unit according to the point cloud data by using a reverse engineering technique further comprises:
and generating the internal structure of the three-dimensional model of the thermal power plant unit by adopting a drawing modeling mode according to the drawing of the thermal power plant unit.
3. The method for generating the three-dimensional model of the thermal power plant unit according to claim 1, wherein the step of rendering the filmed three-dimensional model by using a multi-level-of-detail technique and a dynamic occlusion rejection technique to generate the rendered three-dimensional model specifically comprises:
based on a multi-detail level technology, calculating the distance of a camera in real time according to the current observation visual angle of a user, when the distance of the camera is greater than a preset threshold value, identifying the appearance of the equipment by using a three-dimensional model with a first surface number, and when the distance of the camera is not greater than the preset threshold value, identifying the appearance of the equipment by using a three-dimensional model with a second surface number, wherein the second surface number is greater than the first surface number;
based on a dynamic occlusion rejection technology, the angle of the camera is calculated in real time according to the current observation visual angle of a user, the occluded structure inside the three-dimensional model is determined according to the angle calculation result, and the rendering of the occluded structure inside is stopped.
4. A three-dimensional virtual maintenance system of a thermal power plant unit, characterized in that the three-dimensional virtual maintenance system comprises: a basic data layer, a three-dimensional scene layer and a three-dimensional application layer;
the basic data layer is used for generating a three-dimensional model of the thermal power plant unit by adopting the three-dimensional model generation method of the thermal power plant unit as claimed in any one of claims 1 to 3 according to point cloud data of the thermal power plant unit generated by the three-dimensional laser scanner, and generating service data according to technical data of the thermal power plant unit; the technical data comprises a system flow chart, a design document, a process principle description, a material, a drawing, operation and maintenance rules and an expert knowledge base document;
the three-dimensional scene layer is used for hanging the service data on the three-dimensional model to generate a three-dimensional scene containing the service data;
the application layer is used for interacting with the user in an interactive roaming mode.
5. The three-dimensional virtual overhaul system of a thermal power plant unit according to claim 4, wherein the three-dimensional scene containing the service data comprises a unit-level scene, a system-level scene and an equipment-level scene;
the unit level scene comprises buildings and steel structures in a production area of a power plant, a unit equipment structure and connecting pipelines among the unit equipment;
the system level scene comprises the spatial distribution of the unit equipment, the arrangement of connecting pipelines among the unit equipment and the positions of valves;
the equipment level scene comprises models of the parts of the unit equipment, free visual angle switching models of the parts of the unit equipment and exploded views of the parts of the unit equipment.
6. The three-dimensional virtual overhaul system of a thermal power plant unit according to claim 4, wherein the application layer comprises a structural principle learning module, an overhaul process learning module, and a typical failure learning module;
the structure principle learning module is used for displaying the composition structure and the working principle of the unit equipment according to a user instruction;
the maintenance process learning module is used for simulating the maintenance process of the unit equipment according to the user instruction;
the typical fault learning module is used for demonstrating fault phenomena by using the effect of a three-dimensional scene of the unit equipment according to a user instruction.
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