A precision control method for open-close roof aluminum alloy net shell based on digital pre-assembly

Abstract

The application relates to the technical field of spatial structure construction control, and specifically discloses a precision control method for an open-close roof aluminum alloy net shell based on digital pre-assembly, which comprises the following steps: a unified vector reference system is established, including a coordinate system, cable vectors and net shell curvature reference, a cable-net shell vector coupling model is constructed, the coupling relationship among cable vectors, node displacement and net shell normal vectors is restored, two rounds of tension simulation are carried out, curvature deviation risk areas are identified, net shell pre-correction coordinates are calculated, deviation transmission paths are quantified, a deviation transmission coefficient matrix is constructed, cable adjustment priorities are determined in combination with cable vector critical values, cable tension sequences and grouping are finally optimized, cable length pre-adjustment amounts are calculated, quantitative modeling and active control of cable-net shell precision control are realized, the net shell curvature deviation and the open-close butt joint gap are ensured to be within a range, construction precision and efficiency are improved, and the risk of rework is reduced.

Description

Technical Field

[0001] This invention relates to the field of spatial structure construction control technology, specifically to a method for precision control of openable roof aluminum alloy mesh shells based on digital pre-assembly. Background Technology

[0002] Retractable aluminum alloy mesh roofs are widely used in large-span buildings such as swimming pools and convention centers due to their advantages of being lightweight, high-strength, aesthetically pleasing, and highly adaptable to different spaces. However, due to their complex structural system and the strong coupling between the cables and the mesh shell, cable deviations (direction / length) are prone to occur during tensioning. These deviations can be amplified through the nodes, leading to excessive curvature shifts in the mesh shell and affecting the docking accuracy and smooth operation of the retractable units.

[0003] In existing technologies, the precision control of retractable aluminum alloy mesh roofs largely relies on construction experience, lacking systematic quantitative modeling and active control methods. Firstly, a unified vector benchmark system has not been established, and the correlation analysis between the cable and the mesh shell curvature lacks precise basis. Secondly, the coupling relationship between the cable and the mesh shell is not fully considered, the deviation transmission path is unclear, and the adjustment process is blind. Thirdly, the determination of the tensioning sequence and the pre-adjustment amount of the cable length lacks quantitative support, which can easily lead to the accumulation and amplification of deviations. Fourthly, relying solely on single simulations or on-site re-measurements for adjustment makes it impossible to predict risks in advance, resulting in low construction efficiency and high rework rates.

[0004] Therefore, the present invention provides a method for precision control of openable and retractable aluminum alloy mesh roof shells based on digital pre-assembly. Summary of the Invention

[0005] The purpose of this invention is to provide a method for precision control of openable and retractable aluminum alloy mesh roof shells based on digital pre-assembly, so as to solve the above-mentioned background problems.

[0006] The objective of this invention can be achieved through the following technical solution: a method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly, comprising the following steps: A vector reference system is established for the connection between the aluminum alloy mesh shell and the cable structure of the retractable roof, and a cable-mesh shell vector coupling model is constructed based on the theoretical relationship between the aluminum alloy mesh shell and the cable structure. The tensioning process of the aluminum alloy mesh shell and cable structure of the opening and closing roof is simulated in the cable-mesh shell vector coupling model by digital pre-assembly to determine whether there is a risk of curvature displacement of the aluminum alloy mesh shell. If so, the pre-corrected coordinates of the mesh shell are calculated. A secondary simulation was performed on the tensioning process of the aluminum alloy mesh shell and cable structure of the retractable roof. The coordinates of the aluminum alloy mesh shell were pre-corrected based on the pre-corrected coordinates of the mesh shell. After the pre-correction, the offset analysis of the cable-mesh shell vector was performed to determine whether there was a coupling deviation after the pre-correction. If they exist, locate the deviation shell area and the deviation cable, quantify the deviation transmission path of each deviation cable tensioning, and determine the cable priority by constructing a deviation transmission coefficient matrix; The tensioning sequence and grouping of the cables are optimized based on cable priority, and the length adjustment of each cable is determined. The correction parameters are output in combination with the pre-corrected coordinates of the reticulated shell.

[0007] Furthermore, the construction process of the vector reference system and the cable-net shell vector coupling model is as follows: A three-dimensional rectangular coordinate system is established with the geometric center of the pre-embedded steel plate of the lower fixed support of the mesh shell as the origin: the X-axis is parallel to the movement direction of the opening and closing roof movable unit, the Y-axis is perpendicular to the opening and closing direction, and the Z-axis is perpendicular to the roof. Extract the design parameters for each cable, including the design coordinates of the two end nodes, the design cable length, and the design cable force; Calculate the unit vector of the cable design direction and integrate it into the cable vector reference, including the cable number, the unit vector of the cable design direction, the design cable length and the design cable force, and the node numbers at both ends of the cable. For aluminum alloy reticulated shells, key control points are selected, design normal vectors and design curvature radii are extracted, and integrated into the reticulated shell curvature reference. Establish the force and deformation transmission link between cable endpoints, nodes, and reticulated shell members: the force generated by cable tension is transmitted to the reticulated shell through the nodes, and the deformation of the reticulated shell changes the coordinates of the cable endpoints in the opposite direction through the nodes, thereby adjusting the cable vector.

[0008] Furthermore, the method for determining whether there is a risk of curvature displacement in the aluminum alloy mesh shell is as follows: In the digital pre-assembly platform, vector parameters are integrated into the structural model, and the cable forces are applied in stages according to the design. After each stage of tensioning, the actual direction unit vector and actual cable length of all cables, as well as the actual normal vector and three-dimensional coordinates of the key control points of the reticulated shell are collected. For any given critical control point: Calculate the angle between the design normal vector and the actual normal vector to obtain the curvature offset angle; Calculate curvature offset : ,in, R0 is the curvature offset angle, and R0 is the design curvature radius; For any shell region, calculate the average curvature offset of each key control point. If the average curvature offset meets the requirements, mark the shell region as a risk region. The proportion of risk areas in all reticulated shell areas is calculated to obtain the risk area proportion. If the risk area proportion meets the requirements, there is a risk of curvature displacement of the aluminum alloy reticulated shell.

[0009] Furthermore, the calculation method for the pre-corrected coordinates of the reticulated shell is as follows: For any critical control point, the pre-correction amount is: ,in, The curvature offset obtained from the simulation, R0 is the design curvature. If the curvature offset is downward, that is... If the value is greater than 0, then the pre-correction amount is greater than 0.

[0010] Furthermore, the method for determining whether coupling deviation exists is as follows: In the cable-net shell vector coupling model, the coordinates of the control points of the net shell are adjusted according to the pre-corrected coordinate table of the key control points of the net shell, the surface shape of the net shell is updated, and the tensioning process is simulated twice. Determine whether each cable is offset based on the cable vector; For any critical control point, the curvature offset is calculated twice, and the average curvature offset of critical control points in each shell region is calculated. If the average curvature offset is greater than or equal to the preset offset, the shell region is marked as a risk region. If, after a second simulation, there is one or more risk areas, and the cables connecting these risk areas are offset, then there is a coupling deviation.

[0011] Furthermore, the method for determining whether each cable has an offset is as follows: For the i-th root: Cable length deviation is , where L 1i For the actual cable length, L 0i For design cable length; Cable direction deviation is ,in, Let i be the design direction unit vector of the i-th root. Let be the actual direction unit vector of the i-th root; If both the cable length deviation and the cable vector deviation are within the standard range, then the standard is met; otherwise, there is an offset.

[0012] Furthermore, the deviation transmission coefficient matrix is ​​constructed as follows: In the cable-net shell vector coupling model, each cable is tensioned to the design force, the other cables are locked, and the deviation increments of all cables are recorded, including: The directional deviation transmission coefficient is the angular increment of the directional deviation generated by cable i when the tension cable j reaches the design cable force F0. The ratio of the design cable force F0, i.e. ; Cable length deviation transmission coefficient C ij The increment of cable length deviation produced by cable i when cable j is tensioned to the design cable force F0. The ratio of F0, i.e. ; The matrix has an dimension of N×N, where N is the total number of cables. The matrix row i is the number of the affected cable, the matrix column j is the number of the target tension cable, and the matrix row i and column j correspond to the transmission coefficient of the i-th cable when tensioning the j-th cable.

[0013] Furthermore, the method for determining the priority of the index is as follows: For any one of the strands: Calculate the sum of the directional deviations of the cable under the tension of all cables to obtain the directional deviation influence coefficient; Calculate the sum of the effects of cable length deviations caused by tensioning of all cables to obtain the cable length deviation influence coefficient; The comprehensive influence coefficient is obtained by adding the direction deviation influence coefficient and the cable length deviation influence coefficient. The cables are sorted in descending order of their comprehensive influence coefficient to obtain the cable priority.

[0014] Furthermore, the process of optimizing the tensioning sequence and grouping of the cable tensioning process based on cable priority is as follows: According to the priority order of the cables, each cable and its associated cables are in the same group, and cables in symmetrical positions are in the same group. Each group consists of 3-5 cables. The tensioning sequence is as follows: tensioning between groups is performed in descending order of the average priority of the cables within the group, and synchronous loading is performed within the group.

[0015] Furthermore, the calculation process for the cable length pre-adjustment amount is as follows: Cable length pre-compensation: self-elastic elongation compensation + passive deformation compensation + transmission deviation compensation, where: The self-elastic elongation compensation is the elastic elongation after cable tensioning, and the passive deformation compensation is... L i,2 L0 represents the passive deformation of cable i in the second simulation, L0 represents the actual cable length in the second simulation, and the transmission deviation compensation is the sum of the transmission deviations of other cables to cable i.

[0016] The beneficial effects of this invention are as follows: By establishing a unified vector benchmark system including coordinate system, cable vector, and shell curvature, and combining it with the cable-shell vector coupling model, the cable-shell coupling relationship is transformed into a computable vector transmission link, so that deviation analysis and adjustment have a precise quantitative basis, and the shell curvature offset and cable vector deviation are controlled within the standard range, solving the problems of blind adjustment and difficulty in controlling accuracy in traditional methods. Through two rounds of digital pre-assembly simulation, the curvature offset risk area is first identified and the pre-correction coordinates of the reticulated shell are calculated to offset the global deformation. Then, the deviation transmission path is quantified and the transmission coefficient matrix is ​​constructed. The strong transmission path is blocked from two dimensions: process optimization (tensioning sequence grouping) and parameter compensation (cable length pre-adjustment). This reduces the number of on-site adjustments and avoids rework costs caused by deviation amplification. Based on the priority optimization of cable adjustment, the tensioning sequence is optimized, and the pre-adjustment formula of cable length (combining elastic elongation, passive deformation, and transmission deviation compensation) is used to achieve active control, which shortens the construction cycle. At the same time, a closed-loop management system of design-simulation-construction-acceptance is formed to avoid the vicious cycle of cable force redistribution and shell deformation, ensure the long-term stable operation of the opening and closing roof, and control the docking gap and the synchronization error of the moving unit within an acceptable range. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a flowchart of a method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to the present invention; Figure 2 This is a flowchart for determining whether there is a risk of curvature deviation in aluminum alloy mesh shells in this invention. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Example: Please refer to Figure 1 As shown, the present invention discloses a precision control method for retractable aluminum alloy mesh shell roofs based on digital pre-assembly. This method addresses the precision control of retractable aluminum alloy mesh shell roofs by establishing a unified vector reference system, including a coordinate system, cable vectors, and mesh shell curvature references. A cable-mesh shell vector coupling model is constructed to reconstruct the coupling relationship between cable vectors, nodal displacements, and mesh shell normal vectors. Through two rounds of tensioning simulation, the curvature offset risk area is identified, and the mesh shell pre-correction coordinates are calculated. The deviation transmission path is quantified, and a deviation transmission coefficient matrix is ​​constructed. The cable adjustment priority is determined by combining the cable vector critical value. Finally, the cable tensioning sequence and grouping are optimized, and the cable length pre-adjustment amount is calculated. This achieves quantitative modeling and active control of cable-mesh shell precision control, ensuring that the mesh shell curvature offset and opening / closing gap are within acceptable limits, improving construction accuracy and efficiency, and reducing rework risks. Specifically, the method includes the following steps: Step 1: Establish a vector reference system for the connection between the aluminum alloy mesh shell and the cable structure of the retractable roof, and construct a cable-mesh shell vector coupling model based on the theoretical relationship between the aluminum alloy mesh shell and the cable structure; In step one, the process of constructing the vector reference system includes: The first point to clarify is that the establishment of a vector benchmark system is as follows: With the geometric center of the pre-embedded steel plate of the fixed support at the bottom of the reticulated shell as the origin O, a three-dimensional rectangular coordinate system is established: the X-axis is parallel to the movement direction of the opening and closing roof movable unit, the Y-axis is perpendicular to the opening and closing direction, and the Z-axis is perpendicular to the roof, ensuring that the coordinates of all cables, nodes, and reticulated shells are consistent. Secondly, it should be noted that the establishment of the index vector reference is as follows: Extract the design parameters for each cable, including the design coordinates of the two end nodes A0 (x1, y1, z1) and B0 (x2, y2, z2), the design cable length L0, and the design cable force F0; Calculate the unit vector of the cable design direction: The modulus is 1, where u0i is the design direction unit vector of the i-th root; It is integrated into a cable vector reference, including cable number, cable design direction unit vector, design cable length L0 and design cable force F0, and the node numbers at both ends of the cable; Thirdly, it should be noted that the establishment of the reticulated shell curvature reference is as follows: Select key control points (cable connection nodes, opening and closing joint edges, and uniformly distributed points) and extract design normal vectors. (Perpendicular to the tangent plane of the design surface) and the design radius of curvature R0, and integrate them into the curvature reference of the reticulated shell; In step one, the process of constructing the multi-cable-reticulated shell coupling model includes: The coupling relationship between cable vector, nodal displacement vector, and shell normal vector is clarified, and a multi-cable-shell vector coupling model is constructed, specifically as follows: The first point to clarify is that component-based vector modeling is specifically as follows: Cable structure: Modeled according to vector definition, the cable axis direction strictly follows the design unit vector, the length is entered, flexible rod element is used, and the cable and node connection is defined as hinge (small rotation is allowed, and fine adjustment of vector direction is not restricted). Aluminum alloy mesh shell: Oblique mesh is generated according to the design surface equation. Shell elements are used, and parameters such as member cross section and elastic modulus are entered. Normal vector monitoring units are bound at the design coordinates of key control points to output the normal vector in real time during the simulation process. Node structure: Modeled as elastic solid elements, accurately restoring the stiffness characteristics of plate / composite nodes. Node displacement is represented by node displacement vector = (node ​​X-axis displacement, node Y-axis displacement, node Z-axis displacement), which is directly related to the coordinate changes of the cable endpoints. Secondly, it should be noted that the vector coupling relationship is defined as follows: Establish the force and deformation transmission link between cable endpoints, nodes, and reticulated shell members: The force generated by cable tension is transmitted to the reticulated shell through the nodes, and the deformation of the reticulated shell changes the coordinates of the cable endpoints in the opposite direction through the nodes, thereby adjusting the cable vector (direction + length). It should be noted that the purpose of constructing the vector benchmark system and the cable-net shell vector coupling model is to: unify the quantification standards, restore the cable-net shell coupling relationship, and provide a precise digital twin basis for all subsequent simulations, analyses, and adjustments; Step 2: Simulate the tensioning process of the aluminum alloy mesh shell and cable structure of the opening and closing roof in the cable-mesh shell vector coupling model through digital pre-assembly to determine whether there is a risk of curvature displacement of the aluminum alloy mesh shell. If so, calculate the pre-corrected coordinates of the mesh shell. Please see Figure 2 As shown, in step two, the process of determining whether there is a risk of curvature displacement in the aluminum alloy mesh shell includes: In the digital pre-assembly platform, vector parameters are integrated into the structural model, and grouped and graded tensioning conditions are set according to the actual construction plan, such as: inner ring cable - middle ring cable - outer ring cable, with 3-6 cables in each group; The cable tension is applied in stages according to the design force. After each stage of tensioning, the actual direction unit vector u of all cables is collected. 1i Actual cable length, actual normal vector n of the key control points of the reticulated shell. 1k 3D coordinates; The aluminum alloy mesh shell is divided into multiple regions based on functional relevance and structural consistency, for example: Opening and closing docking area: The docking edge of the movable unit and the area within 0.5-1m on both sides; Strong coupling zone of cable-net shell: the area within 1-2m around the shared node of multiple cables, and the area with dense cable connection nodes; Gentle curvature region: A region without cable connections and with a curvature change rate ≤ 0.05 rad / m; Multiple key control points were selected in various regions of the aluminum alloy mesh shell for curvature offset calculation, specifically: For any given critical control point: Calculate the angle between the design normal vector and the actual normal vector to obtain the curvature offset angle. : ,in, To design the normal vector, This is the actual normal vector; Calculate curvature offset : ,in, R0 is the curvature offset angle, and R0 is the design curvature radius. The curvature offset reflects the surface offset per meter of length. For any shell region, calculate the average curvature offset of each key control point and compare it with the preset offset. If the average curvature offset is greater than or equal to the preset offset, then mark the shell region as a risk region. It should be noted that the preset offset is a warning threshold for the average curvature offset of a single region divided by the shell. If the average curvature offset of the key control points in a certain region is greater than or equal to the preset offset, it means that the surface deformation in that region has approached or reached the critical state that requires active intervention. The setting should be made according to actual needs. The proportion of risk areas in all reticulated shell areas is calculated to obtain the proportion of risk areas, and then compared with the preset proportion. If the proportion of risk areas is greater than or equal to the preset proportion, the aluminum alloy reticulated shell has the risk of curvature displacement. It should be noted that the preset percentage is a warning threshold for the number of risk areas relative to the total number of areas. If the percentage of risk areas is greater than or equal to the preset percentage, it indicates that the curvature offset risk has spread from a local area to multiple areas, constituting a global systemic risk. In step two, the calculation process of the pre-corrected coordinates of the reticulated shell includes: Based on the curvature offset, the coordinates of the control points are adjusted in reverse to ensure that the surface of the tensioned reticulated shell matches the design shape. Specifically: For any critical control point, the pre-correction amount is: ,in, The curvature offset obtained from the simulation, R0 is the design curvature. If the curvature offset is downward, that is... If the value is greater than 0, then the pre-correction amount is greater than 0; It should be noted that the purpose of determining whether there is a risk of curvature shift in the reticulated shell and calculating the corrected coordinates is to: replicate the construction conditions, identify the risk of global curvature shift in advance, and actively compensate for global systemic deformation through pre-corrected coordinates, thereby reducing the risk of large deviations from the source. Step 3: Perform a secondary simulation of the tensioning process of the aluminum alloy mesh shell and cable structure of the retractable roof. Based on the pre-corrected coordinates of the mesh shell, pre-correct the coordinates of the aluminum alloy mesh shell, and perform offset analysis on the cable-mesh shell vector after pre-correction to determine whether there is a coupling deviation after pre-correction. In step three, the process of determining whether a coupling deviation exists includes: In the cable-net shell vector coupling model, the coordinates of the control points of the net shell are adjusted according to the pre-corrected coordinate table of the key control points of the net shell, and the surface morphology of the net shell is updated. A second simulation of the tensioning process was performed: The first point to clarify is that calculating the cable vector deviation includes both cable length deviation and cable direction deviation, specifically: For the i-th root: Cable length deviation is , where L 1i For the actual cable length, L 0i For design cable length; Cable direction deviation is ,in, Let i be the design direction unit vector of the i-th root. Let be the actual direction unit vector of the i-th root; If both the cable length deviation and the cable vector deviation are within the standard range, then the standard is met; otherwise, there is a deviation. Secondly, it should be noted that the calculation of the curvature deviation of the reticulated shell is as follows: For any given critical control point: Secondary calculation of curvature offset ,in, This is a quadratic simulation of the actual normal vector; Calculate the average curvature offset of key control points within each shell region. If the average curvature offset is greater than or equal to the preset offset, the shell region is marked as a risk region; otherwise, it is a normal region. If, after a second simulation, there is one or more risk areas, and the connecting cables within the risk areas are offset, then there is a coupling deviation. It should be noted that the purpose of performing a second simulation after pre-correcting the coordinates of the reticulated shell to determine whether there is a cable-reticulated shell coupling deviation is to: verify the global pre-correction effect, locate the local coupling deviation that has not been canceled, and provide a target for subsequent accurate quantification of deviation transmission; Step 4: If present, locate the deviation shell area and the cable, quantify the deviation transmission path of each cable tensioning, and determine the cable priority by constructing a deviation transmission coefficient matrix; In step four, the process of constructing the deviation transmission coefficient matrix includes: In the cable-net shell vector coupling model, each cable is tensioned to the design force, the other cables are locked, and the deviation increments of all cables are recorded, including: Direction deviation vector increment : , represents the difference between the actual unit vector of cable i and the design value after cable j is tensioned, where, Let i be the design direction unit vector of the i-th root. Let be the actual direction unit vector of the i-th root; Directional deviation angle increment : ; Cable length deviation increment : , represents the difference between the actual cable length of cable i and the design value after cable j is tensioned, where L 1i For the actual cable length, L 0i For design cable length; The direction deviation transfer coefficient matrix and the cable length deviation transfer coefficient matrix are constructed as follows: The first point to clarify is the calculation of the direction deviation transmission coefficient and the cable length deviation transmission coefficient: Directional deviation transmission coefficient K ij The angular increment of the directional deviation of cable i when the tension j reaches the design cable force F0. The ratio of the design cable force F0, i.e. ; Cable length deviation transmission coefficient C ijThe increment of cable length deviation produced by cable i when cable j is tensioned to the design cable force F0. The ratio of F0, i.e. ; It is understandable that the physical meaning of the direction deviation transmission coefficient and the cable length deviation transmission coefficient is as follows: the direction deviation transmission coefficient quantifies how many millimeters the curvature of the reticulated shell will shift for every 1 degree change in the direction of the cable force, and the cable length deviation transmission coefficient quantifies how many millimeters the curvature of the reticulated shell will shift for every 1 millimeter change in the cable length. Secondly, it should be explained how to construct the transfer coefficient matrix: The matrix has dimensions N×N (N is the total number of cables), the matrix row (i) is the number of the affected cable, the matrix column (j) is the number of the target tension cable, and the matrix row i and column j correspond to the transfer coefficient of the i-th cable when tensioning the j-th cable. For example, a 3-cable system: |Affected cable tensioning cable|Cable 1|Cable 2|Cable 3|; |Sonic 1|K 11 ;C 11 |K 12 ;C 12 |K 13 ;C 13 |; |Son 2|K 21 ;C 21 |K 22 ;C 22 |K 23 ;C 23 |; |Son 3|K 31 ;C 31 |K 32 ;C 32 |K 33 ;C 33 |; In step three, the process of determining the priority of the search cable includes: For any given string i: Calculate the sum of the directional deviations of cable i under the tension of all cables to obtain the directional deviation influence coefficient. : ; Calculate the sum of the influence of cable length deviation on cable i due to the tension of all cables, and obtain the cable length deviation influence coefficient. : ; The comprehensive influence coefficient is obtained by adding the direction deviation influence coefficient and the cable length deviation influence coefficient. The cables are sorted in descending order of their comprehensive influence coefficient to obtain the cable priority. It is understandable that the physical meaning of cable priority is: to quantify the comprehensive risk contribution of a single cable to the curvature accuracy of the reticulated shell. The higher the index, the more likely the cable is to be both the core hub of deviation transmission (with a wide range of influence and high intensity) and the high-risk source of curvature exceeding the standard (it is extremely sensitive to deviation). It has the strongest constraint on the curvature of the reticulated shell to meet the standard and should be adjusted first to minimize the risk of global deviation accumulation. Step 5: Optimize the tensioning sequence and grouping of the cables according to the cable priority, determine the cable length adjustment amount for each cable, and output the correction parameters in combination with the pre-corrected coordinates of the reticulated shell. In step five, the process of optimizing the tensioning sequence and grouping of the cable tensioning process based on cable priority includes: The grouping principle is as follows: According to the priority order of the cables, each cable and its associated cable belong to the same group (e.g., cable 1 + cable 2 + cable 5, cable 1 is the first-level cable, and cables 2 and 5 are strong transmission cables). Symmetrical cables are in the same group (e.g., cables 1 and 3 are symmetrical and are tensioned synchronously to balance deformation). Each group consists of 3-5 rods to ensure the feasibility of synchronous control; The tensioning sequence is as follows: tensioning between groups is performed in descending order of the average priority of the cables within the group, and synchronous loading is performed within the group; In step five, the calculation process for the pre-adjustment amount of the cable length for each cable is as follows: Cable length pre-compensation: self-elastic elongation compensation + passive deformation compensation + transmission deviation compensation, specifically: Self-elastic elongation compensation: The elastic elongation of the cable after tensioning needs to be pre-shortened. Passive deformation compensation amount: L i,2 L0 represents the passive deformation of cable i in the second simulation, and L0 represents the actual cable length in the second simulation. Transmission deviation compensation amount: the sum of transmission deviations of other cables to cable i; It should be noted that the purpose of optimizing the tensioning sequence, grouping, and cable length pre-adjustment calculation is to transform the quantitative analysis results into actual construction parameters, and to block the transmission of deviations and offset coupling deviations through process optimization and parameter compensation, thereby ensuring that the accuracy meets the standards.

[0021] The technical solution and advantages of this application are as follows: A vector reference system is established for the connection between the aluminum alloy mesh shell and the cable structure of the retractable roof, and a cable-mesh shell vector coupling model is constructed based on the theoretical relationship between the aluminum alloy mesh shell and the cable structure; the tensioning process of the aluminum alloy mesh shell and the cable structure of the retractable roof is simulated in the cable-mesh shell vector coupling model through digital pre-assembly to determine whether there is a risk of curvature displacement of the aluminum alloy mesh shell; if so, the pre-corrected coordinates of the mesh shell are calculated; a secondary simulation is performed on the tensioning process of the aluminum alloy mesh shell and the cable structure of the retractable roof, and the coordinates of the aluminum alloy mesh shell are pre-corrected according to the pre-corrected coordinates of the mesh shell, and the cable-mesh shell vector is offset after pre-correction to determine whether there is a coupling deviation after pre-correction; if so, the deviation mesh shell area and the deviation cable are located, and the deviation transmission path of each deviation cable is quantified, and the cable priority is determined by constructing a deviation transmission coefficient matrix; the tensioning sequence and grouping of the cable tensioning process are optimized according to the cable priority, and the cable length adjustment amount of each cable is determined, and the correction parameters are output in combination with the pre-corrected coordinates of the mesh shell. This invention establishes a unified vector reference system, including a coordinate system, cable vectors, and shell curvature references, constructs a cable-shell vector coupling model, restores the coupling relationship between cable vectors, nodal displacements, and shell normal vectors, identifies curvature offset risk areas and calculates pre-correction coordinates of the shell through two rounds of tensioning simulation, quantifies the deviation transmission path, constructs a deviation transmission coefficient matrix, determines cable adjustment priorities by combining cable vector critical values, and finally optimizes the cable tensioning sequence and grouping, calculates the pre-adjustment amount of cable length, and realizes quantitative modeling and active control of cable-shell precision control. This ensures that shell curvature offset and opening / closing gaps are within range, improves construction accuracy and efficiency, and reduces rework risks.

[0022] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A method for precision control of retractable roof aluminum alloy mesh shells based on digital pre-assembly, characterized in that: Includes the following steps: A vector reference system is established for the connection between the aluminum alloy mesh shell and the cable structure of the retractable roof, and a cable-mesh shell vector coupling model is constructed based on the theoretical relationship between the aluminum alloy mesh shell and the cable structure. The tensioning process of the aluminum alloy mesh shell and cable structure of the opening and closing roof is simulated in the cable-mesh shell vector coupling model by digital pre-assembly to determine whether there is a risk of curvature displacement of the aluminum alloy mesh shell. If so, the pre-corrected coordinates of the mesh shell are calculated. A secondary simulation was performed on the tensioning process of the aluminum alloy mesh shell and cable structure of the retractable roof. The coordinates of the aluminum alloy mesh shell were pre-corrected based on the pre-corrected coordinates of the mesh shell. After the pre-correction, the offset analysis of the cable-mesh shell vector was performed to determine whether there was a coupling deviation after the pre-correction. If they exist, locate the deviation shell area and the deviation cable, quantify the deviation transmission path of each deviation cable tensioning, and determine the cable priority by constructing a deviation transmission coefficient matrix; The tensioning sequence and grouping of the cables are optimized based on cable priority, and the length adjustment of each cable is determined. The correction parameters are output in combination with the pre-corrected coordinates of the reticulated shell.

2. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 1, characterized in that: The construction process of the vector reference system and the cable-net shell vector coupling model is as follows: A three-dimensional rectangular coordinate system is established with the geometric center of the pre-embedded steel plate of the lower fixed support of the mesh shell as the origin: the X-axis is parallel to the movement direction of the opening and closing roof movable unit, the Y-axis is perpendicular to the opening and closing direction, and the Z-axis is perpendicular to the roof. Extract the design parameters for each cable, including the design coordinates of the two end nodes, the design cable length, and the design cable force; Calculate the unit vector of the cable design direction and integrate it into the cable vector reference, including the cable number, the unit vector of the cable design direction, the design cable length and the design cable force, and the node numbers at both ends of the cable. For aluminum alloy reticulated shells, key control points are selected, design normal vectors and design curvature radii are extracted, and integrated into the reticulated shell curvature reference. Establish the force and deformation transmission link between cable endpoints, nodes, and reticulated shell members: the force generated by cable tension is transmitted to the reticulated shell through the nodes, and the deformation of the reticulated shell changes the coordinates of the cable endpoints in the opposite direction through the nodes, thereby adjusting the cable vector.

3. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 2, characterized in that: The method for determining whether there is a risk of curvature displacement in the aluminum alloy mesh shell is as follows: In the digital pre-assembly platform, vector parameters are integrated into the structural model, and the cable forces are applied in stages according to the design. After each stage of tensioning, the actual direction unit vector and actual cable length of all cables, as well as the actual normal vector and three-dimensional coordinates of the key control points of the reticulated shell are collected. For any given critical control point: Calculate the angle between the design normal vector and the actual normal vector to obtain the curvature offset angle; Calculate curvature offset : ,in, R0 is the curvature offset angle, and R0 is the design curvature radius; For any shell region, calculate the average curvature offset of each key control point. If the average curvature offset meets the requirements, mark the shell region as a risk region. The proportion of risk areas in all reticulated shell areas is calculated to obtain the risk area proportion. If the risk area proportion meets the requirements, there is a risk of curvature displacement of the aluminum alloy reticulated shell.

4. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 3, characterized in that: The calculation method for the pre-corrected coordinates of the reticulated shell is as follows: For any critical control point, the pre-correction amount is: ,in, The curvature offset obtained from the simulation, R0 is the design curvature. If the curvature offset is downward, that is... If the value is greater than 0, then the pre-correction amount is greater than 0.

5. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 1, characterized in that: The method for determining whether there is a coupling deviation is as follows: In the cable-net shell vector coupling model, the coordinates of the control points of the net shell are adjusted according to the pre-corrected coordinate table of the key control points of the net shell, the surface shape of the net shell is updated, and the tensioning process is simulated twice. Determine whether each cable is offset based on the cable vector; For any critical control point, the curvature offset is calculated twice, and the average curvature offset of critical control points in each shell region is calculated. If the average curvature offset is greater than or equal to the preset offset, the shell region is marked as a risk region. If, after a second simulation, there is one or more risk areas, and the cables connecting these risk areas are offset, then there is a coupling deviation.

6. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 5, characterized in that: The method for determining whether each cable has an offset is as follows: For the i-th root: Cable length deviation is , where L 1i For the actual cable length, L 0i For design cable length; Cable direction deviation is ,in, Let i be the design direction unit vector of the i-th root. Let be the actual direction unit vector of the i-th root; If both the cable length deviation and the cable vector deviation are within the standard range, then the standard is met; otherwise, there is an offset.

7. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 1, characterized in that: The deviation transmission coefficient matrix is ​​constructed as follows: In the cable-net shell vector coupling model, each cable is tensioned to the design force, the other cables are locked, and the deviation increments of all cables are recorded, including: The directional deviation transmission coefficient is the angular increment of the directional deviation generated by cable i when the tension cable j reaches the design cable force F0. The ratio of the design cable force F0, i.e. ; Cable length deviation transmission coefficient C ij The increment of cable length deviation produced by cable i when cable j is tensioned to the design cable force F0. The ratio of F0, i.e. ; The matrix has an dimension of N×N, where N is the total number of cables. The matrix row i is the number of the affected cable, the matrix column j is the number of the target tension cable, and the matrix row i and column j correspond to the transmission coefficient of the i-th cable when tensioning the j-th cable.

8. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 7, characterized in that: The method for determining the priority of the search is as follows: For any one of the strands: Calculate the sum of the directional deviations of the cable under the tension of all cables to obtain the directional deviation influence coefficient; Calculate the sum of the effects of cable length deviations caused by tensioning of all cables to obtain the cable length deviation influence coefficient; The comprehensive influence coefficient is obtained by adding the direction deviation influence coefficient and the cable length deviation influence coefficient. The cables are sorted in descending order of their comprehensive influence coefficient to obtain the cable priority.

9. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 1, characterized in that: The process of optimizing the tensioning sequence and grouping of the cable tensioning process based on cable priority is as follows: According to the priority order of the cables, each cable and its associated cables are in the same group, and cables in symmetrical positions are in the same group. Each group consists of 3-5 cables. The tensioning sequence is as follows: tensioning between groups is performed in descending order of the average priority of the cables within the group, and synchronous loading is performed within the group.

10. The method for precision control of a retractable roof aluminum alloy mesh shell based on digital pre-assembly according to claim 9, characterized in that: The calculation process for the cable length pre-adjustment amount is as follows: Cable length pre-compensation: self-elastic elongation compensation + passive deformation compensation + transmission deviation compensation, where: The self-elastic elongation compensation is the elastic elongation after cable tensioning, and the passive deformation compensation is... L i,2 L0 represents the passive deformation of cable i in the second simulation, L0 represents the actual cable length in the second simulation, and the transmission deviation compensation is the sum of the transmission deviations of other cables to cable i.

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