Parametric modeling method of electrified railway contact network cantilever based on Revit

Abstract

The present invention discloses a parametric modeling method for electrified railway catenary booms based on Revit. The method comprises: 1. classifying booms with similar geometric features and analyzing and refining the geometric features of each type of boom; 2. parameterizing the assembly dimensions used in each type of boom based on the geometric feature classification results and organizing and setting parameters; and 3. incorporating geometric calculations into the model parameter settings based on the geometric features and design requirements to establish a parametric model. The present invention provides a parametric modeling method for electrified railway catenary booms based on Revit, which highly parameterizes the assembly dimensions, allows the model to be changed according to the dimensional parameters, and is easily reused and extensible.

Description

Technical Field

[0001] The present invention relates to the technical field of electrified circuit contact networks, and in particular to a Revit-based parametric modeling method for electrified railway contact network arms. Background Art

[0002] With the development of BIM (Building Information Modeling) technology and its extension into railway construction, three-dimensional information models are increasingly being used in the construction and management of electrified railway projects. The use of three-dimensional information models for the transport and interaction of geometric parameters is particularly well-suited for cantilever installation projects, as the cantilever structure requires complete installation of equipment and materials, has numerous constraint parameters, and features similar geometric shapes but distinct parameters across the cantilever. This approach is of great significance for improving the level of information management in railway projects. This present invention proposes an accurate and efficient modeling method for three-dimensional information models of cantilever structures using Revit software.

[0003] Currently, the common practice in modeling catenary arm cantilevers is to first build models of the various cantilever arm accessories, and then combine these parts according to the given preset assembly dimensions according to the cantilever arm installation diagram to form the cantilever arm model. Although these models express the geometric appearance of the cantilever arm accessories in detail, the combined cantilever arm model can also reflect the differences between different cantilever arm structures. However, the preset assembly dimensions on the cantilever arm installation diagram are mainly for illustration, representing the simulated design results of a type of cantilever arm. However, in actual engineering, even within the same type of design, the assembly dimensions of each cantilever arm set are different. These models do not fully parameterize the assembly dimensions, and it is impossible to reflect these differences in the model.

[0004] Furthermore, the characteristics of catenary engineering require that the contact wires and catenary cables of the cantilever be positioned strictly according to the designed dimensions. However, in actual engineering practice, the installation conditions of each cantilever vary. Therefore, during the design of the cantilever, adjustments to the assembly parameters were taken into account to ensure that the contact wires and catenary cables remain in the same position. This also requires that the cantilever model should have the same characteristics, requiring the model to adapt to changes in assembly dimensions and accurately control the position of the contact wires and catenary cables.

[0005] In summary, the wrist-arm model assembled directly according to the preset assembly dimensions obviously cannot meet the usage requirements.

[0006] Chinese patent application number: 200810048067.7, filed on June 18, 2008, and published on December 24, 2008. The patent title is "Method for Calculating and Installing Cannulas for Electrified Contact Networks on High-Speed ​​Railways." This patent document discloses a method for calculating and installing cannulas for electrified contact networks on high-speed railways, including calculations of the length of the flat cannulas, the length of the inclined cannulas tube, the installation position of the locating ring on the inclined cannulas, cannulas calculation, cannulas pre-assembly, and cannulas installation. The method belongs to the field of railway transportation electromechanical engineering, and in particular, to a construction method for installing flat and inclined cannulas on high-speed railway contact networks. The method solves the problem of complex positioning of flat and inclined cannulas during installation, which consumes significant line time. It provides a highly efficient construction method. It maximizes the use of non-closed-point time, accurately calculates and prefabricates the cannulas, reduces significant on-site adjustment time and railway occupancy time, and significantly improves economic efficiency.

[0007] The above patent document discloses a method for calculating and installing the electrified contact network arm of a high-speed railway. However, this method is not suitable for the parametric modeling method of the electrified railway contact network arm based on Revit. The electrified contact network arm calculation method is not comprehensive enough and cannot enable designers to perform parametric modeling of the railway contact network arm, and cannot meet the design needs of contact network designers. Summary of the Invention

[0008] The main purpose of the present invention is to address the shortcomings of the above-mentioned modeling methods and propose a parametric modeling method for the electrified railway contact network arm based on Revit, which highly parameterizes the assembly dimensions, enables the model to change according to the dimensional parameters, and is easy to reuse and expand.

[0009] To achieve the above-mentioned object, the present invention proposes a parametric modeling method for electrified railway catenary arm based on Revit, comprising the following steps:

[0010] Step 1: Classify arms with similar geometric features, and analyze and refine the geometric features of each type of arm;

[0011] Step 2: Parameterize the assembly dimensions used in each type of cantilever according to the geometric feature classification results, and organize and set the parameters;

[0012] Step 3: According to the geometric features and design requirements, geometric calculations are added to the model parameter settings to establish a parametric model.

[0013] The analysis and refinement of the geometric features in step 1 includes the following steps:

[0014] Step 1) Performing geometric feature analysis based on the cantilever installation diagram, it is concluded that the cantilever has four sets of geometric features, and it is determined that four cantilever basic models need to be established;

[0015] Step 2) Further abstractly analyze the four sets of geometric features of the cantilever arm, take the pointing directions of the flat cantilever arm and the oblique cantilever arm to form a plane, and establish a plane rectangular coordinate system with the intersection of the cantilever arm support and the ground as the origin.

[0016] The step 1) establishes four basic models of the cantilever including a positive positioning model, a reverse positioning model, an anchor support positioning model, and a bending positioning model.

[0017] Arranging and setting parameters in step 2 includes the following steps:

[0018] Step a: Arrange and group the parameters that affect the coordinates of the control points according to the drawings:

[0019] Step b: Analyze and calculate the control point parameters.

[0020] The parameters of the control point coordinates in step a include measurement parameters, accessory size parameters, and assembly size parameters.

[0021] The method for implementing step b comprises the following steps:

[0022] Step 1) Calculate the coordinate parameters of the control points using the same formula in the geometric features;

[0023] Step 2) Calculate the coordinate parameters of the control points unique to each geometric feature.

[0024] The step 1) calculates the coordinate parameters of the control points, including: the coordinate parameters of the contact line suspension point, the coordinate parameters of the center point of the load-bearing cable, the coordinate parameters of the base installation point on the cantilever, the coordinate parameters of the flat rod porcelain starting point, the coordinate parameters of the flat cantilever starting point, the coordinate parameters of the support pipe clamp installation point, the coordinate parameters of the inclined cantilever positioning point, the coordinate parameters of the base installation point under the cantilever, the coordinate parameters of the inclined rod porcelain starting point, the coordinate parameters of the inclined cantilever starting point, and the coordinate parameters of the support pipe clamp installation point;

[0025] The contact line suspension points include point X1 and point Y1; the calculation formulas for point X1 and point Y1 are:

[0026] X1 = side limit + contact line suspension height * sin (- rail surface angle) - pull-out value * cos (- rail surface angle)

[0027] Y1 = contact wire suspension height * cos (- rail surface angle) + pull-out value * sin (- rail surface angle)

[0028] The center points of the load-bearing cables include point X2 and point Y2; the calculation formulas for points X2 and Y2 are:

[0029] Where X2 = X1, Y2 = height of the center of the load-bearing cable;

[0030] The base mounting points on the arm include point X3 and point Y3; the calculation formulas for point X3 and point Y3 are:

[0031] X3 = upper base installation height * sin (- support angle) + cantilever support * cos (support angle)

[0032] Y3 = upper base installation height * cos (- support angle) + cantilever support * sin (support angle)

[0033] The starting points of the flat rod porcelain include point X4 and point Y4; the calculation formulas of the points X4 and Y4 are:

[0034] X4=X3+cantilever base l*cos(pillar bevel angle)

[0035] Y4=Y3+cantilever base l*sin(pillar bevel angle)

[0036] The starting points of the flat wrist arm include point X5 and point Y5; the calculation formulas of point X5 and point Y5 are:

[0037] X5=X4+cos(flat cantilever angle)*(rod porcelain L-rod porcelain h)

[0038] Y5=Y4-sin(flat arm angle)*(rod porcelain L-rod porcelain h)

[0039] The support pipe clamp installation points include a support pipe clamp first installation point and a support pipe clamp second installation point;

[0040] The first installation point of the support pipe clamp includes point X6 and point Y6. The calculation formula of point X6 and point Y6 is:

[0041] X6=X4+cos(flat wrist angle)*(rod porcelain L+distance from support tube clamp to flat rod porcelain)

[0042] Y6=Y4-sin(flat wrist angle)*(rod porcelain L+distance from support tube clamp to flat rod porcelain)

[0043] The second installation point of the support pipe clamp includes point X11 and point Y11; the calculation formula of point X11 and point Y11 is:

[0044] X11=X9+cos(angle of oblique arm)*(rod porcelain L+distance from support tube clamp to oblique rod porcelain)

[0045] Y11=Y9+sin(angle of oblique arm)*(rod porcelain L+distance from support tube clamp to oblique rod porcelain);

[0046] The oblique arm positioning points include X7 and Y7. The calculation formulas for X7 and Y7 are as follows:

[0047] X7 = X2 - sin (flat cantilever angle) * load-bearing cable seat h - cos (flat cantilever angle) * distance from load-bearing cable seat to oblique cantilever connector - sin (flat cantilever angle) * oblique cantilever connector h

[0048] Y7 = Y2 - cos (flat cantilever angle) * load-bearing cable seat h + sin (flat cantilever angle) * distance from load-bearing cable seat to oblique cantilever connector - cos (flat cantilever angle) * oblique cantilever connector h;

[0049] The mounting points of the lower base of the cantilever arm include point X8 and point Y8; the calculation formulas of point X8 and point Y8 are:

[0050] X8 = lower base installation height * sin (- support angle) + cantilever support * cos (support angle)

[0051] Y8 = lower base installation height * cos (- support angle) + cantilever support * sin (support angle);

[0052] The starting points of the inclined rod porcelain include point X9 and point Y9; the calculation formulas of point X9 and point Y9 are:

[0053] X9=X8+cantilever base l*cos(pillar bevel angle)

[0054] Y9 = Y8 + cantilever base l * sin (pillar bevel angle);

[0055] The starting points of the oblique arm include point X10 and point Y10; the calculation formulas of point X10 and point Y10 are:

[0056] X10 = X9 + cos (angle of oblique cantilever) * (rod porcelain L - rod porcelain h)

[0057] Y10=Y9+sin(oblique cantilever angle)*(rod porcelain L-rod porcelain h).

[0058] The control point coordinate parameters specific to step 2) include: control point coordinate parameters specific to positive positioning, control point coordinate parameters specific to reverse positioning, control point coordinate parameters specific to anchor support positioning, and control point coordinate parameters specific to curved positioning.

[0059] The coordinate parameters of the control points specific to the positive positioning and the coordinate parameters of the control points specific to the curved positioning include the coordinate parameters of the first positioning tube endpoint and the coordinate parameters of the second positioning tube endpoint, respectively; the coordinate parameters of the control points specific to the reverse positioning include the coordinate parameters of the flat wrist-arm endpoint; the coordinate parameters of the control points specific to the anchor support positioning include the coordinate parameters of the flat wrist-arm endpoint;

[0060] The first positioning tube endpoint coordinate parameters of the positive positioning unique control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is:

[0061] X12 = (((Y1 + locator assembly height + cos (oblique arm angle) * clamp positioning ring h - Y9) * (X7 - X9)) / (Y7 - Y9)) + X9 + sin (oblique arm angle) * clamp positioning ring h - contact line suspension height * sin (- rail surface angle)

[0062] Y12 = Y1 + positioner assembly height + cos (oblique arm angle) * clamp positioning ring h - cos (oblique arm angle) * clamp positioning ring h;

[0063] The coordinate parameters of the second positioning tube endpoint of the positive positioning unique control point coordinate parameters include X13 point and Y13 point; the calculation formula of the X13 point and Y13 point is:

[0064] X13 = X1 - width of positioner group - contact line suspension height * sin (- rail surface angle)

[0065] Y13 = Y12 + (X1 - X12 - width of positioner group - contact line suspension height * sin (- rail surface angle)) * tan (angle of oblique cantilever arm);

[0066] The coordinate parameters of the flat wrist-arm endpoint of the reverse positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of X12 point and Y12 point is:

[0067] X12=X1+locator group width

[0068] Y12 = Y1 + positioner group height;

[0069] The coordinate parameters of the flat arm end point of the anchor support positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is:

[0070] X12=X1+locator group width

[0071] Y12 = Y1 + positioner group height;

[0072] The first positioning tube endpoint coordinate parameters of the bend positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is:

[0073] X12 = (((Y1 + locator assembly height + cos (oblique arm angle) * clamp positioning ring h - Y9) * (X7 - X9)) / (Y7 - Y9)) + X9 + sin (oblique arm angle) * clamp positioning ring h

[0074] Y12=Y1+positioner assembly height+cos(oblique arm angle)*hoop positioning ring h-cos(oblique arm angle)*hoop positioning ring h

[0075] The coordinate parameters of the second positioning tube endpoint of the curved positioning specific control point coordinate parameters include X13 point and Y13 point; the calculation formula of the X13 point and Y13 point is:

[0076] X13 = X5 + (X1 - X14 + width of positioner assembly) / cos (flat cantilever angle) + flat cantilever height * tan (flat cantilever angle) - (rod porcelain L - rod porcelain h)

[0077] X13=Y12.

[0078] The step 3 of establishing the parameterized model includes the following steps:

[0079] Step 1) Open the Revit family editor and create four metric families according to different positioning forms;

[0080] Step 2) Create the analyzed and refined parameters into the family model according to different positioning forms;

[0081] Step 3) Create the control point parameters into the family model and set the corresponding calculation formula in the sorting setting parameters into the corresponding parameters;

[0082] Step 4) Assemble the wrist-arm accessory model according to the control point calculation results, and constrain the accessories with the control point calculation results;

[0083] Step 5) Process the model according to the arm function in the contact network installation diagram.

[0084] The beneficial effects of the technical solution provided by the present invention are:

[0085] 1) The present invention uses Revit software to perform parametric modeling design of electrified railway contact network cantilever, which not only makes the design more accurate but also enables the design to be completed quickly, greatly saving the time for modifying the design scheme and improving work efficiency;

[0086] 2) The design method of the present invention has more comprehensive functions, more flexible operation, and more convenient use, and can meet the needs of designers of parametric modeling of electrified railway catenary arms;

[0087] 3) The design of the present invention has a wide range of applications and is suitable for widespread promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0089] Figure 1 This is a flow chart of a parametric modeling method for an electrified railway catenary arm based on Revit according to an embodiment of the present invention;

[0090] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0091] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0092] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0093] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0094] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0095] Example 1

[0096] The present invention proposes a parametric modeling method for an electrified railway contact network arm based on Revit.

[0097] Reference Figure 1 In one embodiment of the present invention, a parametric modeling method for an electrified railway overhead contact network arm based on Revit includes a data input module, a data preprocessing module, a database, and a data analysis and processing module. The method includes the following steps:

[0098] Step S100, start;

[0099] Step S200: Classify arms with similar geometric features, and analyze and refine the geometric features of each type of arm;

[0100] Step S300: parameterize the assembly dimensions used in each type of cantilever according to the geometric feature classification results, and organize and set parameters;

[0101] Step S400: Add geometric calculations to model parameter settings based on geometric features and design requirements to establish a parametric model;

[0102] Step S500, end.

[0103] In this embodiment, step S200 is actually to summarize the structural features of the cantilevers according to the installation drawings, classify the cantilevers with similar geometric features in a set of installation drawings, and analyze and refine the geometric features of each type of cantilevers;

[0104] In this embodiment, step S300 is actually to parameterize the assembly dimensions used in each type of arm according to the geometric feature classification results, sort out the dimensions that affect the geometric relationship during the assembly process, and create them as parameters that can be used by the model;

[0105] In this embodiment, step S400 actually adds geometric calculations to the model parameter settings based on the geometric features and design requirements, and uses a model (first-level model) to express the geometric features of a type of arm to achieve the bearing of dimensional parameters and model parameterization control functions.

[0106] In this embodiment, preferably, the primary model is processed in combination with the functions of different arms to generate an arm model (secondary model) with engineering significance, thereby giving the abstract model actual functions;

[0107] In this embodiment, when project-level application is performed, the secondary model is expanded according to the floor plan and the installation drawing to obtain the arm model ultimately used in the project.

[0108] The modeling software used in this invention is Autodesk Revit; the accessory model and bracket model used in the modeling are the models used in the existing modeling method.

[0109] In this embodiment, preferably, the analysis and refinement of the geometric features in step 1 includes the following steps:

[0110] Step 1) Perform geometric feature analysis based on the cantilever installation diagram. Analyze the positive positioning installation diagram, the reverse positioning installation diagram, and the conversion column installation diagram to find that the cantilever has four sets of geometric features, and determine that four cantilever basic models need to be established.

[0111] Step 2) Further abstractly analyze the four sets of geometric features of the cantilever arm, take the pointing directions of the flat cantilever arm and the oblique cantilever arm to form a plane, and establish a plane rectangular coordinate system with the intersection of the cantilever arm support and the ground as the origin.

[0112] In this embodiment, further, preferably, the step 1) establishes four basic arm models including a positive positioning model, a reverse positioning model, an anchor support positioning model, and a bending positioning model.

[0113] In this embodiment, preferably, the step 2 of arranging the setting parameters includes the following steps:

[0114] Step a: Arrange and group the parameters that affect the coordinates of the control points according to the drawings:

[0115] Step b: Analyze and calculate the control point parameters.

[0116] In this embodiment, further, preferably, the parameters of the control point coordinates in step a include measurement parameters, accessory size parameters, and assembly size parameters.

[0117] In this embodiment, further, preferably, the measured parameters include:

[0118] 1. Side limit parameters;

[0119] 2. Rail surface angle parameter: calculated by atan (0.5*superelevation / rail center distance);

[0120] 3. Upper base installation height parameters;

[0121] 4. Lower base installation height parameters;

[0122] 5. Pull out value parameters;

[0123] 6. Pillar bevel parameters;

[0124] In this embodiment, further, preferably, the accessory size parameters include:

[0125] 1. Cantilever support parameters: The cantilever support parameters include the width of the cantilever support;

[0126] 2. First cantilever base parameters: The first cantilever base parameters include the thickness of the cantilever base fixing piece;

[0127] 3. Rod porcelain parameter L: The rod porcelain parameter L includes the length of the rod porcelain insulator;

[0128] 4. Rod porcelain parameter h: The rod porcelain parameter h includes the socket length of the rod porcelain insulator connecting the wrist arm;

[0129] 5. Load-bearing cable seat parameter h: The load-bearing cable seat parameter h includes the load-bearing cable seat height;

[0130] 6. Hoop positioning ring parameter h: the hoop positioning ring parameter h is the height of the hoop positioning ring;

[0131] 7. Positioner group width parameter: The positioner group width parameter includes the fixed width of the positioning device composed of the positioning support, limit positioner, and positioning wire clamp;

[0132] 8. Positioner group height parameter: The positioner group height parameter includes the fixed height of the positioning device composed of the positioning support, limit positioner, and positioning wire clamp;

[0133] In this embodiment, further, preferably, the assembly dimension parameters include:

[0134] 1. Contact wire suspension height parameters;

[0135] 2. Parameters of the center height of the catenary cable;

[0136] 3. Structural height parameters;

[0137] 4. Parameter h of the oblique cantilever connection;

[0138] 5. Distance parameter from the load-bearing cable seat to the oblique cantilever connector;

[0139] 6. Distance parameters from support tube clamp to inclined rod porcelain;

[0140] 7. Distance parameters from support tube clamp to flat rod porcelain;

[0141] 8. Flat arm angle parameter: The flat arm angle parameter is set to 0° according to design requirements;

[0142] In this embodiment, the oblique arm angle is obtained by atan[(Y7–Y9) / (X7–X9)];

[0143] In this embodiment, preferably, the method for implementing step b includes the following steps:

[0144] Step 1) Calculate the coordinate parameters of the control points using the same formula in the geometric features;

[0145] Step 2) Calculate the coordinate parameters of the control points unique to each geometric feature.

[0146] In this embodiment, further, preferably, the step 1) calculates the control point coordinate parameters including: the contact line suspension point coordinate parameters, the load-bearing cable center point coordinate parameters, the arm upper base installation point coordinate parameters, the flat rod porcelain starting point coordinate parameters, the flat arm starting point coordinate parameters, the support pipe clamp installation point coordinate parameters, the inclined arm positioning point coordinate parameters, the arm lower base installation point coordinate parameters, the inclined rod porcelain starting point coordinate parameters, the inclined arm starting point coordinate parameters, and the support pipe clamp installation point coordinate parameters;

[0147] The contact line suspension points include point X1 and point Y1; the calculation formulas for point X1 and point Y1 are:

[0148] X1 = side limit + contact line suspension height * sin (- rail surface angle) - pull-out value * cos (- rail surface angle)

[0149] Y1 = contact wire suspension height * cos (- rail surface angle) + pull-out value * sin (- rail surface angle)

[0150] The center points of the load-bearing cables include point X2 and point Y2; the calculation formulas for points X2 and Y2 are:

[0151] Where X2 = X1, Y2 = height of the center of the load-bearing cable;

[0152] The base mounting points on the arm include point X3 and point Y3; the calculation formulas for point X3 and point Y3 are:

[0153] X3 = upper base installation height * sin (- support angle) + cantilever support * cos (support angle)

[0154] Y3 = upper base installation height * cos (- support angle) + cantilever support * sin (support angle)

[0155] The starting points of the flat rod porcelain include point X4 and point Y4; the calculation formulas of the points X4 and Y4 are:

[0156] X4=X3+cantilever base l*cos(pillar bevel angle)

[0157] Y4=Y3+cantilever base l*sin(pillar bevel angle)

[0158] The starting points of the flat wrist arm include point X5 and point Y5; the calculation formulas of point X5 and point Y5 are:

[0159] X5=X4+cos(flat cantilever angle)*(rod porcelain L-rod porcelain h)

[0160] Y5=Y4-sin(flat arm angle)*(rod porcelain L-rod porcelain h)

[0161] The support pipe clamp installation points include a support pipe clamp first installation point and a support pipe clamp second installation point;

[0162] The first installation point of the support pipe clamp includes point X6 and point Y6. The calculation formula of point X6 and point Y6 is:

[0163] X6=X4+cos(flat wrist angle)*(rod porcelain L+distance from support tube clamp to flat rod porcelain)

[0164] Y6=Y4-sin(flat wrist angle)*(rod porcelain L+distance from support tube clamp to flat rod porcelain)

[0165] The second installation point of the support pipe clamp includes point X11 and point Y11; the calculation formula of point X11 and point Y11 is:

[0166] X11=X9+cos(angle of oblique arm)*(rod porcelain L+distance from support tube clamp to oblique rod porcelain)

[0167] Y11=Y9+sin(angle of oblique arm)*(rod porcelain L+distance from support tube clamp to oblique rod porcelain);

[0168] The oblique arm positioning points include X7 and Y7. The calculation formulas for X7 and Y7 are as follows:

[0169] X7 = X2 - sin (flat cantilever angle) * load-bearing cable seat h - cos (flat cantilever angle) * distance from load-bearing cable seat to oblique cantilever connector - sin (flat cantilever angle) * oblique cantilever connector h

[0170] Y7 = Y2 - cos (flat cantilever angle) * load-bearing cable seat h + sin (flat cantilever angle) * distance from load-bearing cable seat to oblique cantilever connector - cos (flat cantilever angle) * oblique cantilever connector h;

[0171] The mounting points of the lower base of the cantilever arm include point X8 and point Y8; the calculation formulas of point X8 and point Y8 are:

[0172] X8 = lower base installation height * sin (- support angle) + cantilever support * cos (support angle)

[0173] Y8 = lower base installation height * cos (- support angle) + cantilever support * sin (support angle);

[0174] The starting points of the inclined rod porcelain include point X9 and point Y9; the calculation formulas of point X9 and point Y9 are:

[0175] X9=X8+cantilever base l*cos(pillar bevel angle)

[0176] Y9 = Y8 + cantilever base l * sin (pillar bevel angle);

[0177] The starting points of the oblique arm include point X10 and point Y10; the calculation formulas of point X10 and point Y10 are:

[0178] X10 = X9 + cos (angle of oblique cantilever) * (rod porcelain L - rod porcelain h)

[0179] Y10=Y9+sin(oblique cantilever angle)*(rod porcelain L-rod porcelain h).

[0180] In this embodiment, further, preferably, the control point coordinate parameters unique to step 2) include: control point coordinate parameters unique to positive positioning, control point coordinate parameters unique to reverse positioning, control point coordinate parameters unique to anchor positioning, and control point coordinate parameters unique to curved positioning.

[0181] The coordinate parameters of the control points specific to the positive positioning and the coordinate parameters of the control points specific to the curved positioning include the coordinate parameters of the first positioning tube endpoint and the coordinate parameters of the second positioning tube endpoint, respectively; the coordinate parameters of the control points specific to the reverse positioning include the coordinate parameters of the flat wrist-arm endpoint; the coordinate parameters of the control points specific to the anchor support positioning include the coordinate parameters of the flat wrist-arm endpoint;

[0182] The first positioning tube endpoint coordinate parameters of the positive positioning unique control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is:

[0183] X12 = (((Y1 + locator assembly height + cos (oblique arm angle) * clamp positioning ring h - Y9) * (X7 - X9)) / (Y7 - Y9)) + X9 + sin (oblique arm angle) * clamp positioning ring h - contact line suspension height * sin (- rail surface angle)

[0184] Y12 = Y1 + positioner assembly height + cos (oblique arm angle) * clamp positioning ring h - cos (oblique arm angle) * clamp positioning ring h;

[0185] The coordinate parameters of the second positioning tube endpoint of the positive positioning unique control point coordinate parameters include X13 point and Y13 point; the calculation formula of the X13 point and Y13 point is:

[0186] X13 = X1 - width of positioner group - contact line suspension height * sin (- rail surface angle)

[0187] Y13 = Y12 + (X1 - X12 - width of positioner group - contact line suspension height * sin (- rail surface angle)) * tan (angle of oblique cantilever arm);

[0188] The coordinate parameters of the flat wrist-arm endpoint of the reverse positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of X12 point and Y12 point is:

[0189] X12=X1+locator group width

[0190] Y12 = Y1 + positioner group height;

[0191] The coordinate parameters of the flat arm end point of the anchor support positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is:

[0192] X12=X1+locator group width

[0193] Y12 = Y1 + positioner group height;

[0194] The first positioning tube endpoint coordinate parameters of the bend positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is:

[0195] X12 = (((Y1 + locator assembly height + cos (oblique arm angle) * clamp positioning ring h - Y9) * (X7 - X9)) / (Y7 - Y9)) + X9 + sin (oblique arm angle) * clamp positioning ring h

[0196] Y12=Y1+positioner assembly height+cos(oblique arm angle)*hoop positioning ring h-cos(oblique arm angle)*hoop positioning ring h

[0197] The coordinate parameters of the second positioning tube endpoint of the curved positioning specific control point coordinate parameters include X13 point and Y13 point; the calculation formula of the X13 point and Y13 point is:

[0198] X13 = X5 + (X1 - X14 + width of positioner assembly) / cos (flat cantilever angle) + flat cantilever height * tan (flat cantilever angle) - (rod porcelain L - rod porcelain h)

[0199] X13=Y12.

[0200] In this embodiment, preferably, the step 3 of establishing the parameterized model includes the following steps:

[0201] Step 1) Open the Revit family editor and create four metric families according to different positioning forms;

[0202] Step 2) Create the analyzed and refined parameters into the family model according to different positioning forms;

[0203] Step 3) Create the control point parameters into the family model and set the corresponding calculation formula in the sorting setting parameters into the corresponding parameters;

[0204] Step 4) Assemble the wrist-arm accessory model according to the control point calculation results, and constrain the accessories with the control point calculation results;

[0205] Step 5) Process the model according to the arm function in the contact network installation diagram.

[0206] In step 1 above, open the Revit family editor and create four metric families according to different positioning forms. The length unit is millimeter (mm) and the angle unit is degree (°);

[0207] The above step 2) is actually to create the parameters in the above step 1) into the family model according to different positioning forms;

[0208] The above step 3) is actually to create the control point parameters into the family model and set the corresponding calculation formula in the above step 2) into the corresponding parameters;

[0209] Step 4) above essentially involves assembling the arm and cantilever accessory models according to the control point calculation results, and constraining the accessories based on these calculations. The resulting models are considered Level 1 models, and are named "Positive Positioning Template," "Reverse Positioning Template," "Anchor Positioning Template," and "Curved Positioning Template," respectively. These models are characterized by expressing cantilever shapes with similar geometric features. The accessory models are constrained by the calculation results and serve as templates for further model expansion.

[0210] Step 5) is actually to further process the first-level model according to the arm function in the contact network installation diagram, expand the model dimension and perform secondary assembly according to the function. The method is as follows;

[0211] Step a): Add a double-slot load-bearing cable seat accessory model to the positive positioning template and the reverse positioning template, and interchange it with the single-slot load-bearing cable seat accessory model so that the model can meet the two functions of the intermediate column and the central anchor column. The processed models are named "intermediate column positive positioning wrist arm" and "intermediate column reverse positioning wrist arm".

[0212] Step b) Assemble the four templates into the double-branch cantilever bracket model according to the anchor segment joint cantilever installation diagram, and associate the parameters in the template model with the same name in the bracket model. Each cantilever needs to form a model interchange of the four templates. The model after such processing has the function of expressing the anchor segment joint cantilever. This model is named "anchor segment joint conversion column cantilever"; this model and the model established in the above step a) together constitute a secondary model.

[0213] The above-mentioned combination of the functions of different wrist arms processes the first-level model to produce a wrist arm model (secondary model) with engineering significance, and realizes the assignment of actual functions to the abstract model. In fact, the type name and installation drawing number of the wrist arm used in the current project are obtained based on the wrist arm installation drawing and wrist arm plan layout drawing in the contact network engineering project. The wrist arm function information is obtained through the type name, and mapped to the second-level model according to the many-to-one relationship to find the second-level model corresponding to each wrist arm. Based on the second-level model, the installation drawing model is the parameter source, and the parameters of the second-level model are expanded in the manner that each installation drawing corresponds to an installation drawing model. Thanks to the method of constraining the wrist arm accessories by calculated parameters, the parameters unique to each installation drawing are input into the corresponding second-level model to obtain a model that conforms to the installation drawing;

[0214] At this point, these models are ready for use in the project. By naming these models according to the names of the installation drawings, you will get the arm models that can be used in the project.

[0215] Due to various conditions at the engineering site, the contact network arm suspension system of the present invention cannot ensure that the construction results (limits, support slopes, etc.) of the previous process are completely consistent with the ideal conditions in the design.

[0216] Installation drawings, intended to illustrate the structural features of the suspension system, cannot capture the dimensional differences between each catenary suspension system during construction. Furthermore, as paper drawings, they lack the ability to carry data or be modified parametrically. Once construction details and measured parameters are incorporated, the design data becomes disconnected from the data used in construction, making it unable to meet the engineering model's operational requirements.

[0217] If the parametric model produced by the method of the present invention is used, the adjusted wrist-arm model can be generated simultaneously by simply modifying the parameters, which greatly reduces the time required for information transmission and updating, ensures data consistency and accuracy, and improves efficiency.

[0218] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A parametric modeling method for electrified railway catenary arm based on Revit, characterized by: The steps include: Step 1: Classify arms with similar geometric features, and analyze and refine the geometric features of each type of arm; Step 2: Parameterize the assembly dimensions used in each type of cantilever according to the geometric feature classification results, and organize and set the parameters; Step 3: According to the geometric features and design requirements, geometric calculations are added to the model parameter settings to establish a parametric model; The analysis and refinement of the geometric features in step 1 includes the following steps: Step 1) Performing geometric feature analysis based on the cantilever installation diagram, it is concluded that the cantilever has four sets of geometric features, and it is determined that four cantilever basic models need to be established; Step 2) further abstractly analyze the four sets of geometric features of the cantilever arm, take the pointing directions of the flat cantilever arm and the oblique cantilever arm to form a plane, and establish a plane rectangular coordinate system with the intersection of the cantilever arm support and the ground as the origin; Step 1) establishes four basic cantilever arm models including a positive positioning model, a reverse positioning model, an anchor support positioning model, and a bent positioning model.

2. The parametric modeling method for electrified railway overhead contact network cantilever based on Revit according to claim 1, characterized in that: Arranging and setting parameters in step 2 includes the following steps: Step a: Arrange and group the parameters that affect the coordinates of the control points according to the drawings: Step b: Analyze and calculate the control point parameters.

3. The parametric modeling method for electrified railway overhead contact network cantilever based on Revit according to claim 2, characterized in that: The parameters of the control point coordinates in step a include measurement parameters, accessory size parameters, and assembly size parameters.

4. The parametric modeling method for electrified railway overhead contact network cantilever based on Revit according to claim 3, characterized in that: The method for implementing step b comprises the following steps: Step 1) Calculate the coordinate parameters of the control points using the same formula in the geometric features; Step 2) Calculate the coordinate parameters of the control points unique to each geometric feature.

5. The parametric modeling method for electrified railway overhead contact network cantilever based on Revit according to claim 4, characterized in that: The step 1) calculates the coordinate parameters of the control points, including: the coordinate parameters of the contact line suspension point, the coordinate parameters of the center point of the load-bearing cable, the coordinate parameters of the base installation point on the cantilever, the coordinate parameters of the flat rod porcelain starting point, the coordinate parameters of the flat cantilever starting point, the coordinate parameters of the support pipe clamp installation point, the coordinate parameters of the inclined cantilever positioning point, the coordinate parameters of the base installation point under the cantilever, the coordinate parameters of the inclined rod porcelain starting point, the coordinate parameters of the inclined cantilever starting point, and the coordinate parameters of the support pipe clamp installation point; The contact line suspension points include point X1 and point Y1; the calculation formulas for point X1 and point Y1 are: X1 = side limit + contact line suspension height * sin (- rail surface angle) - pull-out value * cos (- rail surface angle) Y1 = contact wire suspension height * cos (- rail surface angle) + pull-out value * sin (- rail surface angle) The center points of the catenary cables include point X2 and point Y2; the calculation formulas for the points X2 and Y2 are as follows: wherein X2 = X1, Y2 = the center height of the catenary cable; The base mounting points on the arm include point X3 and point Y3; the calculation formulas for point X3 and point Y3 are: X3 = upper base installation height * sin (- support angle) + cantilever support * cos (support angle) Y3 = upper base installation height * cos (- support angle) + cantilever support * sin (support angle) The starting points of the flat rod porcelain include point X4 and point Y4; the calculation formulas of the points X4 and Y4 are: X4=X3+cantilever base l*cos(pillar bevel angle) Y4=Y3+cantilever base l*sin(pillar bevel angle) The starting points of the flat wrist arm include point X5 and point Y5; the calculation formulas of point X5 and point Y5 are: X5=X4+cos(flat cantilever angle)*(rod porcelain L-rod porcelain h) Y5=Y4-sin(flat arm angle)*(rod porcelain L-rod porcelain h) The support pipe clamp installation points include a support pipe clamp first installation point and a support pipe clamp second installation point; The first installation point of the support pipe clamp includes point X6 and point Y6. The calculation formula of point X6 and point Y6 is: X6=X4+cos(flat wrist angle)*(rod porcelain L+distance from support tube clamp to flat rod porcelain) Y6=Y4-sin(flat wrist angle)*(rod porcelain L+distance from support tube clamp to flat rod porcelain) The second installation point of the support pipe clamp includes point X11 and point Y11; the calculation formula of point X11 and point Y11 is: X11=X9+cos(angle of oblique arm)*(rod porcelain L+distance from support tube clamp to oblique rod porcelain) Y11=Y9+sin(angle of oblique arm)*(rod porcelain L+distance from support tube clamp to oblique rod porcelain); The oblique arm positioning points include X7 and Y7. The calculation formulas for X7 and Y7 are as follows: X7 = X2 - sin (flat cantilever angle) * load-bearing cable seat h - cos (flat cantilever angle) * distance from load-bearing cable seat to oblique cantilever connector - sin (flat cantilever angle) * oblique cantilever connector h Y7 = Y2 - cos (flat cantilever angle) * load-bearing cable seat h + sin (flat cantilever angle) * distance from load-bearing cable seat to oblique cantilever connector - cos (flat cantilever angle) * oblique cantilever connector h; The mounting points of the lower base of the cantilever arm include point X8 and point Y8; the calculation formulas of point X8 and point Y8 are: X8 = lower base installation height * sin (- support angle) + cantilever support * cos (support angle) Y8 = lower base installation height * cos (- support angle) + cantilever support * sin (support angle); The starting points of the inclined rod porcelain include point X9 and point Y9; the calculation formulas of point X9 and point Y9 are: X9=X8+cantilever base l*cos(pillar bevel angle) Y9 = Y8 + cantilever base l * sin (pillar bevel angle); The starting points of the oblique arm include X10 and Y10. The calculation formula of X10 and Y10 is: X10 = X9 + cos (oblique arm angle) * (rod porcelain L - rod porcelain h) Y10=Y9+sin(oblique cantilever angle)*(rod porcelain L-rod porcelain h).

6. The parametric modeling method for electrified railway overhead contact network cantilever based on Revit according to claim 5, characterized in that: The control point coordinate parameters specific to step 2) include: control point coordinate parameters specific to positive positioning, control point coordinate parameters specific to reverse positioning, control point coordinate parameters specific to anchor support positioning, and control point coordinate parameters specific to curved positioning.

7. The Revit-based parametric modeling method for electrified railway overhead contact network cantilevers according to claim 6, characterized in that: The coordinate parameters of the control points specific to the positive positioning and the coordinate parameters of the control points specific to the curved positioning include the coordinate parameters of the first positioning tube endpoint and the coordinate parameters of the second positioning tube endpoint respectively; The coordinate parameters of the control points specific to reverse positioning include the coordinate parameters of the end points of the flat wrist and arm; the coordinate parameters of the control points specific to anchor positioning include the coordinate parameters of the end points of the flat wrist and arm; The first positioning tube endpoint coordinate parameters of the positive positioning unique control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is: X12 = (((Y1 + locator assembly height + cos (oblique arm angle) * clamp positioning ring h - Y9) * (X7 - X9)) / (Y7 - Y9)) + X9 + sin (oblique arm angle) * clamp positioning ring h - contact line suspension height * sin (- rail surface angle) Y12 = Y1 + positioner assembly height + cos (oblique arm angle) * clamp positioning ring h - cos (oblique arm angle) * clamp positioning ring h; The coordinate parameters of the second positioning tube endpoint of the positive positioning unique control point coordinate parameters include X13 point and Y13 point; the calculation formula of the X13 point and Y13 point is: X13 = X1 - width of positioner group - contact line suspension height * sin (- rail surface angle) Y13 = Y12 + (X1 - X12 - width of positioner group - contact line suspension height * sin (- rail surface angle)) * tan (angle of oblique cantilever arm); The coordinate parameters of the flat wrist-arm endpoint of the reverse positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of X12 point and Y12 point is: X12=X1+locator group width Y12 = Y1 + positioner group height; The coordinate parameters of the flat arm end point of the anchor support positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is: X12=X1+locator group width Y12 = Y1 + positioner group height; The first positioning tube endpoint coordinate parameters of the bend positioning specific control point coordinate parameters include X12 point and Y12 point; the calculation formula of the X12 point and Y12 point is: X12 = (((Y1 + locator assembly height + cos (oblique arm angle) * clamp positioning ring h - Y9) * (X7 - X9)) / (Y7 - Y9)) + X9 + sin (oblique arm angle) * clamp positioning ring h Y12=Y1+positioner assembly height+cos(oblique arm angle)*hoop positioning ring h-cos(oblique arm angle)*hoop positioning ring h The coordinate parameters of the second positioning tube endpoint of the curved positioning specific control point coordinate parameters include X13 point and Y13 point; the calculation formula of the X13 point and Y13 point is: X13 = X5 + (X1 - X14 + width of positioner assembly) / cos (flat cantilever angle) + flat cantilever height * tan (flat cantilever angle) - (rod porcelain L - rod porcelain h) X13=Y12.

8. The parametric modeling method for electrified railway overhead contact network cantilever based on Revit according to claim 2, characterized in that: The step 3 of establishing the parameterized model includes the following steps: Step 1) Open the Revit family editor and create four metric families according to different positioning forms; Step 2) Create the analyzed and refined parameters into the family model according to different positioning forms; Step 3) Create the control point parameters into the family model and set the corresponding calculation formula in the sorting setting parameters into the corresponding parameters; Step 4) Assemble the wrist-arm accessory model according to the control point calculation results, and constrain the accessories with the control point calculation results; Step 5) Name the model and process the parameters according to the arm function in the contact network installation diagram.

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