CN-121980720-A - BIM technology-based air conditioning system pipeline comprehensive optimization and construction control method

CN121980720ACN 121980720 ACN121980720 ACN 121980720ACN-121980720-A

Abstract

The invention discloses a BIM technology-based comprehensive optimization and construction control method for an air conditioning system pipeline, which relates to the technical field of pipeline optimization and comprises the following steps of S1, optimizing triangular patches, S2, determining tetrahedral units, S3, analyzing a mixed computing grid, S4, configuring a solver, S5, outputting performance optimization suggestions and S6, and determining a pipeline optimization scheme. According to the invention, through the intelligent analysis of performance instructions and the multi-constraint automatic optimizing technology, the automatic and intelligent conversion from a performance target to a configurable scheme is realized, a text report is analyzed by utilizing a natural language processing technology, the pipe network range to be adjusted is accurately locked through a topology backtracking algorithm, and under the multiple constraints of structure, space and the like, pipe diameter checking, collision detection, route re-planning and support hanger rechecking are automatically executed, and the process converts the traditional coordination work which depends on manual experience and is extremely prone to errors into a data-driven deterministic flow, so that the design efficiency and the design precision are greatly improved.

Inventors

QIU CHUNSHENG
LIU DELIANG
DONG HAOLIN
DU LINTAO
ZENG FANZHEN

Assignees

广东海外建设咨询有限公司

Dates

Publication Date: 20260505
Application Date: 20260123

Claims (10)

1. The comprehensive optimization and construction control method for the air conditioning system pipeline based on the BIM technology is characterized by comprising the following steps of: s1, optimizing triangular patches, namely after reading a BIM building model of a specified pharmaceutical industry garden, extracting a triangular patch set from the model, optimizing each triangular patch in the set, and determining the region type of each patch in the set; S2, determining tetrahedral units, namely constructing a surface grid set by taking a triangular patch as constraint, automatically generating a tetrahedral unit set filling the internal space of the surface grid set by utilizing the surface grid, performing topology optimization on each unit in the unit set, and deleting unqualified units to form a new tetrahedral unit set; S3, analyzing the mixed calculation grid, namely generating a prismatic grid by utilizing the surface grid set, and matching the prismatic grid with the tetrahedron unit set so as to output the mixed calculation grid; S4, configuring a solver, namely acquiring a mixed computing grid, a space attribute set in a BIM model, an air conditioning system model and a pollution source set, and computing and setting a physical model and boundary conditions of the CFD solver; S5, outputting a performance optimization suggestion, namely receiving the configuration of the CFD solver, the total simulation time, the initial time step length and the three-dimensional coordinates of the key protection points, and then iteratively solving a coupled flow control equation set so as to output a space-time data set containing speed, pressure, temperature and pollutant concentration fields, and analyzing the space-time data set to obtain a performance optimization suggestion report of the air conditioning system; S6, determining a pipeline optimization scheme, namely converting all contents in the performance optimization suggestion report into structural instructions, generating a corresponding path chain for each instruction, performing physical checking calculation on each key pipe section on the path chain, calling a coordination model to evaluate after the checking calculation is completed, and outputting the pipeline optimization design scheme after all geometric changes are determined.
2. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 1, wherein the step S1 specifically comprises the following steps: S11, reading a BIM building model of a specified pharmaceutical industry park, extracting a space set from the model, and converting the space set into a triangular patch set Wherein , , Represent the first The triangular surface patches are arranged on the surface of the substrate, Representation of The three vertex vectors of the three-dimensional model, Representing the total number of triangular patches and constructing the set Wherein S records the adjacency of each vertex, edge, and face; S12, selecting triangular dough pieces Calculation of Area of (2) Wherein , Representation of Three vertex vectors of (1) Will be Marking as redundant and deleting from the set, updating S simultaneously, sequentially selecting Then, the processed new triangle patch set is output Corresponding half data structure ; S13, will All edges which are only referred by a single triangular patch are stored as isolated edges into an edge set, the edges which are connected end to end in the edge set are assembled into a boundary ring, and the boundary ring is selected arbitrarily Calculate it and other boundary loops Is the minimum spatial distance of (2) Wherein , Representation of The vector of the vertices on the upper surface, Representation of The vector of the vertices on the upper surface, Representation of The set of all vertices above is such that, Representation of The set of all vertices above is such that, Representing the number of the sequence; S14, if Then create a new vertex at the midpoint of the closest point pair of the two rings, at After all edges associated with the point pair are reconnected to the new vertex, the current point pair is deleted, a new triangular patch is generated to fill gaps, after each boundary ring is processed in sequence, all the newly generated triangular patches are stored into a set Wherein Representing a distance safety threshold.
3. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 2, wherein the step S1 specifically further comprises the following steps: S15, is a triangular dough piece set Constructing a spatial index, judging whether each triangular patch is related to other patches in a three-dimensional space, if so, calculating the intersection line of the two patches and dividing the intersection line into a plurality of polygons, re-triangulating the polygons through constraint Delay triangulation, and storing the new triangular patches into a set Otherwise, no operation is performed; S16, if in the aggregate If isolated edges still exist, assembling the edges into a boundary ring, projecting the boundary ring onto a best fit plane to obtain a two-dimensional polygon, splitting the polygon, generating filling patches, back projecting all patches back into a three-dimensional space, and storing the obtained triangular patches into a three-dimensional space In (2) according to metadata in BIM building model Classifying each triangular patch, and determining the corresponding region type.
4. The comprehensive optimization and construction control method for the air conditioning system pipeline based on the BIM technology according to claim 1, wherein the step S2 specifically comprises the following steps: S21, receiving different space cleanliness class attribute functions According to Determining the spatial position of each place Target mesh size on ; S22, collecting with triangular patches For constraint, generating a surface grid set by using a constraint delaunay triangulation algorithm, and controlling the maximum side length of the newly generated surface triangular patches Wherein , Representing the position Local feature length at; s23, automatically generating a tetrahedral unit set filling the internal space of the surface grid by using a propelling wavefront method by taking the surface grid as a boundary Wherein , Represent the first The number of the tetrahedral units is the same, Representing the total number of tetrahedral units, Represent the number of sequences, for the first Tetrahedral units Vertex in (a) Statistics of all and Vertices directly connected by edges, as Is calculated by computing adjacent vertices of (a) Geometric center with all adjacent vertices Wherein , Representation of Is defined by a set of adjacent vertices of the model, Representing the number of vertices in the set of neighboring vertices, Representing adjacent vertices, the vertex is to be Is updated as the position of Wherein Wherein lambda is a relaxation factor, all vertexes in each tetrahedron unit are sequentially selected, and after the same operation is performed, an updated tetrahedron unit set is output ; S24, slave Two tetrahedral unit pairs sharing a triangular patch are selected Checking whether the common edge of the switching operation can reduce the maximum edge length ratio, if so, performing the switching operation to form two new tetrahedral units And replaces the original units, otherwise, no operation is performed, and after traversing all the unit pairs with shared faces, the tetrahedral unit set subjected to topology optimization is output After that, screening out Form a new set of tetrahedral units 。
5. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 1, wherein the step S3 specifically comprises the following steps: s31, reading a surface grid set, identifying triangular patches with the area type of a wall surface in the set, calculating the first layer grid height of all triangular patches, and extruding the current triangular patches layer by layer along the normal direction of the current triangular patches serving as a substrate to generate prismatic grids; S32, after deleting the units overlapped by the tetrahedron unit set and the prismatic grid, performing geometric stitching and node matching on the boundary between the outermost layer of the prismatic grid and the tetrahedron unit set, and outputting the mixed calculation grid.
6. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 1, wherein the step S4 specifically comprises the following steps: S41, receiving a mixed computing grid, a space attribute set in a BIM model, an air conditioning system model and a pollution source set as input data; S42, calculating and setting a physical model and boundary conditions of the CFD solver according to the input data, and receiving a spatial clean grade attribute function According to Determining the spatial position of each place Target mesh size on 。 S43, if Greater than zero and less than or equal to the threshold value, then 1, Indicating that the current position is in the critical area, otherwise For 0, the current position is indicated in a non-critical region for which the Realizable k-epsilon turbulence model is activated, and for which the large vortex simulation WALE model is activated.
7. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 1, wherein the step S5 specifically comprises the following steps: S51, receiving CFD solver configuration, total simulation time, initial time step, three-dimensional coordinates of key protection points and corresponding allowable maximum pollutant concentrations as inputs, setting initialization field variables for all units and nodes in a mixed calculation grid, iteratively solving a coupled flow control equation set by using a SIMPLE algorithm, outputting a space-time data set containing speed, pressure, temperature and pollutant concentration fields after solving, and extracting a concentration time sequence of the key protection points; S52, judging whether the analog concentration value of each key protection point exceeds the allowable maximum pollutant concentration at any time according to the concentration time sequence, if so, recording as a violation event, otherwise, not operating; S53, receiving the output pressure field and the space-time data set of the velocity field, extracting a space attribute set from the BIM model, and selecting the space attribute set to meet the requirement Adjacent space pairs of (a) Extracting the space from the pressure field And The pressure value of the key protection point in the time sequence to obtain a pressure array And Calculating the time-sharing difference of the space pair in the simulation stabilization stage Wherein , Representing a set of time periods after simulation to stabilization, Representation of Is used to determine the total number of time steps, Expressed in time Middle space The spatial average of all the guard point pressures inside, Expressed in time Middle space A spatial average of all guard point pressures inside; S54, will And a preset minimum pressure difference Comparing if And judging that the space is not compliant with the pressure difference.
8. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 1, wherein the step S5 specifically comprises the following steps: S55, identifying connection space in mixed computing grid And And the region type is triangle patches of the portal, the time sequence of the velocity vectors of all triangle patches in the stable stage is extracted from the velocity field, for each time step, the net mass flow passing through all patches is calculated, the direction of the net mass flow is judged, and the statistics is carried out in the stable time period In the direction of net mass flow of Flow direction If the ratio is lower than the set threshold value, judging that the air flow direction of the portal is not compliant; s56, sequentially selecting all the rest adjacent space pairs, executing the same operation, and outputting all the space pair lists with non-compliance pressure difference and all the portal lists with non-compliance air flow direction after traversing; s57, counting all the illegal events, a space pair list with inconsistent pressure difference and a portal list with inconsistent air flow direction, and outputting a performance optimization suggestion report of the air conditioning system through a rule engine.
9. The method for comprehensive optimization and construction control of air conditioning system pipelines based on BIM technology according to claim 1, wherein the step S6 specifically comprises the following steps: s61, after receiving the air conditioning system performance optimization suggestion report, carrying out natural language processing on the whole report, automatically identifying and extracting all performance optimization suggestion items through a preset keyword library and grammar rules, carrying out semantic analysis on each identified item, and converting the item into a structured instruction containing an operation type, a target position and a parameter value; S62, invoking a topological relation network of an air conditioning system in the BIM building model, and recursively backtracking in the topological relation network by taking a target position of each structured instruction as a starting point, wherein each instruction generates a corresponding path chain; s63, performing physical checking calculation on each key pipe section on the path chain, calculating a new design index in the air conditioning system according to a parameter value in the instruction, calculating an actual operation index under a specified operation condition according to the current size of each section of air pipe on the path chain, comparing the actual operation index with a standard allowable limit value, automatically reversely calculating a minimum pipe diameter meeting the requirement according to the new design index and the pipe shape if the actual index value exceeds the limit value, calculating a new load according to the instruction related to structure adjustment, and determining an optimal access point and related parameters of the air pipe; S64, after theoretical calculation is completed, a coordination model which is generated by integrating a BIM building model and performing light weight processing is called, all the wind pipe sections to be changed which are obtained through statistics and inspection are placed in the coordination model, the minimum space distance between the wind pipe sections to be changed and all other objects in a scene is calculated, any situation which is smaller than the preset installation distance is recorded as a space conflict, and object identifiers and conflict position coordinates of the two conflicting parties are associated.
10. The method for comprehensive optimization and construction control of air conditioning system pipeline based on BIM technology according to claim 9, wherein the step S6 specifically further includes the steps of: s65, activating an automatic pipeline route planner, wherein the planner takes a conflict position coordinate point as a starting point, regards surrounding existing pipelines and structures as three-dimensional barriers, searches heuristic ways in an available building space on the premise of meeting pipeline process constraint, generates a plurality of alternative route paths without collision, carries out comprehensive evaluation according to a cost function, and finally outputs a modified air pipe route scheme; S66, recalculating load distribution according to the final geometric dimension, material property and medium weight of the air duct to be changed, obtaining the arrangement position and bearing capacity of the existing support of the air duct to be changed, comparing new load distribution with the bearing capacity of the existing support, and identifying all support points to be adjusted; S67, for the supporting point positions to be adjusted, on an adjacent bearing structure, providing load capacity data according to a structural model in the BIM building model, and automatically optimizing and determining new supporting point positions and required supporting model specifications; S68, all geometric changes are synchronously output as BIM building model increment files, and all adding, deleting and modifying operations of the file records relative to an original model are directly combined into a main design model to form an optimal design scheme.

Description

BIM technology-based air conditioning system pipeline comprehensive optimization and construction control method Technical Field The invention relates to the technical field of pipeline optimization, in particular to a comprehensive optimization and construction control method for an air conditioning system pipeline based on a BIM technology. Background The patent application 202411808026.9 discloses a comprehensive optimization design method for pipelines based on BIM technology, which comprises the steps of firstly designating a general principle of pipeline arrangement, then defining a preliminary scheme of an intersection area between pipelines of a professional system, then carrying out grouping optimization, carrying out region-division merging grouping optimization, finally carrying out pipeline layering, unifying management elevation with elevation difference within a threshold range, and obtaining a comprehensive optimization design scheme for the pipelines. The invention not only realizes that the design of each group meets the public principle, but also avoids collision interference among the pipelines of each group through the grouping design of the grouping combination optimization by the grouping area, and simultaneously reduces the building use height occupied by the pipeline installation to the greatest extent through the final pipeline layering design. The whole design steps are reasonably arranged, so that standardized rapid and accurate design can be realized, and the requirement of comprehensive optimization design of most pipelines is met; the problem that the pipeline lacks reasonable distribution in space arrangement is solved in the prior art, but when the pipeline is used, the design mode which completely relies on manual experience is difficult to accurately predict the dead angle of air flow, the diffusion path of pollutants and the weak point of pressure difference, so that space pollution diffusion and energy consumption waste are easily caused, meanwhile, the pipe diameter, the route and the support and the hanger are manually coordinated, the error and leakage are easily caused, the field collision and reworking are caused, the engineering change risk and the engineering change cost are obviously increased, the overall design efficiency is low, and the scheme feasibility is poor. Disclosure of Invention The invention aims to provide a BIM technology-based comprehensive optimization and construction control method for an air conditioning system pipeline, so as to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the air conditioning system pipeline comprehensive optimization and construction control method based on BIM technology comprises the following steps: s1, optimizing triangular patches, namely after reading a BIM building model of a specified pharmaceutical industry garden, extracting a triangular patch set from the model, optimizing each triangular patch in the set, and determining the region type of each patch in the set; S2, determining tetrahedral units, namely constructing a surface grid set by taking a triangular patch as constraint, automatically generating a tetrahedral unit set filling the internal space of the surface grid set by utilizing the surface grid, performing topology optimization on each unit in the unit set, and deleting unqualified units to form a new tetrahedral unit set; S3, analyzing the mixed calculation grid, namely generating a prismatic grid by utilizing the surface grid set, and matching the prismatic grid with the tetrahedron unit set so as to output the mixed calculation grid; S4, configuring a solver, namely acquiring a mixed computing grid, a space attribute set in a BIM model, an air conditioning system model and a pollution source set, and computing and setting a physical model and boundary conditions of the CFD solver; S5, outputting a performance optimization suggestion, namely receiving the configuration of the CFD solver, the total simulation time, the initial time step length and the three-dimensional coordinates of the key protection points, and then iteratively solving a coupled flow control equation set so as to output a space-time data set containing speed, pressure, temperature and pollutant concentration fields, and analyzing the space-time data set to obtain a performance optimization suggestion report of the air conditioning system; S6, determining a pipeline optimization scheme, namely converting all contents in the performance optimization suggestion report into structural instructions, generating a corresponding path chain for each instruction, performing physical checking calculation on each key pipe section on the path chain, calling a coordination model to evaluate after the checking calculation is completed, and outputting the pipeline optimization design scheme after all geometric changes are determined. Preferably, the step