Parametric modeling design method for carriage of power van

Abstract

The invention discloses a power van compartment parameterization modeling design method, which comprises the following steps of: establishing integral model parameters and a relation function among large pieces by combing a common power van structure, a common design method and experience of a power van compartment, a common part and geometric parameters thereof, a common material geometric parameter and the like, finding out frequently changed variables, and designing a power van compartment parameterization model. Establishing a set of general part simplified model configuration library as driving parameters from top to bottom, establishing a design internal function relationship, establishing a set of general part simplified model configuration library as driving variables from bottom to top, and establishing the design internal function relationship, so as to realize parametric modeling; the invention provides a parameterization compartment modeling method, all general parts are respectively established into selectable configurations, parameter variables which are provided with boundary dimension parameters and are used as driving skeleton arrangement are configured, and the compartment model is quickly established by changing main overall variable parameters and general part configurations, so that the modeling period is greatly shortened.

Description

Technical Field

[0001] The invention relates to the field of special-purpose vehicles, and in particular to a parametric modeling design method for a power supply vehicle compartment. Background Art

[0002] At present, the product drawings of power supply vehicles are custom designs. During the peak season, the number of custom orders is large, resulting in a large number of design drawings and a large workload, which cannot meet the short-term rapid drawing requirements. During the peak season, the design resources cannot meet the needs of orders, resulting in failure to deliver on time. Designers are prone to design errors under high-intensity working conditions, which increases the cost of rectification and also affects the delivery time of the whole vehicle. In addition, the knowledge base of the power supply vehicle design software on the market is not perfect, it is difficult for new employees to get started, and some designs have no unified specifications.

[0003] SolidWorks is an excellent feature modeling software under the Windows platform. It has powerful design functions and is relatively easy to operate, so it has been widely used. Among them, most of the research is conducted on single parts, usually using the series part design table in SolidWorks and combining it with databases such as ACCESS to achieve parametric design, while parametric modeling of complex assemblies is rarely involved, and the research involved basically does not introduce the specific process and methods of assembly parametric modeling. Summary of the invention

[0004] The purpose of the present invention is to provide a parametric modeling design method for a power supply vehicle compartment, and to perform three-dimensional modeling of the power supply vehicle compartment based on SolidWorks software to solve the problem of long design time of existing customized power supply vehicles, shorten the three-dimensional modeling time, and reduce the design error rate.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A parametric modeling design method for a power supply vehicle compartment, wherein the power supply vehicle compartment is mainly composed of six parts: a chassis, a left side enclosure, a front enclosure, a rear enclosure, a right side enclosure and a roof, wherein the six parts are all provided with a frame, the left side enclosure is provided with a left side enclosure shutter, a first side door and a second side door, and a lower cabin is provided below; the front enclosure can be provided with a front enclosure shutter; the rear enclosure can be provided with a rear enclosure shutter or a movable cover plate, and is also provided with a rear double door; the right side enclosure is the same as the left side enclosure, and the roof is provided with a ceiling shutter, a muffler and a liquid filling port;

[0007] Its characteristics are: it includes two parts: skeleton parameterization and general parts configuration parameterization. The specific method of modeling design includes the following steps:

[0008] Step 1: Determine the overall layout of the vehicle, and determine the variable parameters required for the car body parametric determination based on the overall layout; the car body variable parameters are divided into three parts: car body overall parameters, six major pieces related parameters and lower cabin parameters, each part includes different variable parameter sub-items;

[0009] Step 2: Analyze the variable parameters of the car body parametric design system and divide the parameter variables into two parts: skeleton parameterization and general parts configuration parameterization;

[0010] Step 3: Use top-down and bottom-up hybrid parametric drive to establish parametric models of each frame of the carriage; the parametric model of the frame includes two major parts: six large-piece frames and a lower cabin frame, wherein the six large-piece frames include a chassis frame, a left side frame, a front side frame, a rear side frame, a right side frame and a roof frame, and the lower cabin frame includes a left lower cabin frame and a right lower cabin frame;

[0011] Step 4: Parameterization of general parts configuration, making parts of the same structure but different sizes into configurations, and providing them to the overall model for optional installation. The configuration includes the features of the general parts and the dimensions and specifications of the parts, where the feature is a simplified .part model;

[0012] Step 5: Input the skeleton parameter variables and the general configuration parameter variables into the parameterized model of step 3 and step 4;

[0013] Step 6: The final required 3D model of the power vehicle compartment is calculated from within the parametric model.

[0014] Furthermore, the skeleton parameterization in step two is mainly to establish the skeleton model of the whole vehicle and the global variable parameters of the whole vehicle, including the installation opening parameters of the optional universal parts. The universal parts configuration mainly includes various universal parts configurations, including the characteristics of universal parts and the external dimensions and specifications of the parts, as well as the parameters for driving the skeleton openings.

[0015] Furthermore, the skeleton parameterized model described in step three is mainly determined by the overall parameters of the car body and the general parts configuration, wherein the overall parameters of the car body determine the external dimensions of each skeleton, that is, the external dimensions of each large piece and the general estimation model are driven from top to bottom through global variables, and the general parts configuration determines the size and position dimensions of the skeleton openings, that is, the generation of the skeleton installation skeleton is driven from bottom to top through the general parts configuration parameters.

[0016] Furthermore, the steps for establishing each frame of the carriage described in step 3 are as follows:

[0017] S1: Establish a unified reference plane. The front view reference plane uses the main view plane of the component. The top view reference plane is preferably centered or bottom. The right view reference plane is centered on the component. The overall parameter relationship of the car body is established based on the global variables L, W, H1 and H2.

[0018] S2: Determine chassis skeleton parameters and establish chassis size internal function relationship table; the chassis skeleton is divided into single-bridge chassis and double-bridge chassis, both of which are composed of multiple chassis cross beams and multiple chassis longitudinal beams. The chassis cross beams are based on the center line of the rear axle, and the chassis cross beams from the center line of the rear axle to the front end of the chassis are designed to be evenly distributed with A1 as the spacing; the chassis cross beams from the center line of the rear axle to the rear end of the chassis are designed to be evenly distributed with B1 as the spacing; no chassis cross beams are arranged at the center line of the rear axle, and the spacing between the two chassis cross beams before and after the center line of the rear axle is 800mm; the design process is driven by global variables L and W to achieve top-down parameterized drive;

[0019] S3: Determine the parameters of the front enclosure frame and establish an internal relationship table of the front enclosure frame size; the front enclosure frame is divided into two types: with front enclosure shutters and without shutters, and is composed of a front enclosure vertical frame and a front enclosure horizontal frame evenly distributed, the spacing of the front enclosure horizontal frames is A2, and the spacing of the front enclosure vertical frames is B2; the design process is driven by global variables W, H1 and H2 to achieve top-down parameterization drive;

[0020] S4: Determine the parameters of the back frame;

[0021] S5: Determine the side frame parameters and establish the internal relationship table of the side frame size; the side frame is mainly composed of a side vertical frame and a side transverse frame, the spacing of the side vertical frames is 500mm, and the side transverse frames are evenly divided according to the side frame height, with a spacing of A3; the design process is driven by global variables L and H1 to achieve top-down parameterization drive;

[0022] S6: Determine the ceiling frame parameters and establish the internal relationship table of the ceiling frame size; the ceiling frame is mainly composed of a top longitudinal frame and a top transverse frame, the top longitudinal frame has a spacing of 500mm, and the top transverse frame is evenly divided according to the ceiling height, with a spacing of A6; the design process is driven by global variables L and W to achieve top-down parametric drive;

[0023] S7: Determine the lower cabin skeleton parameters and establish an internal relationship table of the lower cabin skeleton dimensions; the lower cabin is divided into two types: single bridge and double bridge, which are determined by global variables L and H2 to achieve top-down parametric drive.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention establishes the overall model parameters and the relationship function between the major pieces by sorting out the commonly used power supply vehicle structures, the commonly used design methods and experiences of the power supply vehicle compartments, the common parts and their geometric parameters, the common material geometric parameters, etc., finds out the frequently changed variables as the top-down driving parameters, and establishes the design internal function relationship. At the same time, a set of simplified model configuration libraries of common parts is established as the bottom-up driving variables, and the design internal function relationship is established, so as to realize parametric modeling;

[0026] 2. The present invention simplifies common components into .part models and then makes them into configurations, which can reduce the complexity of the common parts modeling equations, reduce the hardware requirements when the model is running, and avoid arbitrary editing of common parts; this can greatly reduce the repetitive workload of designers, thereby improving work efficiency, reducing fulfillment time, and also reducing the error rate of designers.

[0027] 3. The present invention proposes a parametric car modeling method, which establishes each common part (blinds, side doors, open doors, etc.) into an optional configuration, and configures it with external dimension parameters as parameter variables for driving the skeleton layout, which can solve the problem of large differences in car structure. By changing the main overall variable parameters and common parts configuration, the car model is quickly established, greatly shortening the modeling cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural schematic diagram of the carriage of the present invention;

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the carriage in the rear view direction;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the carriage when looking upward;

[0031] Figure 4 It is the parametric modeling design flow chart of the present invention;

[0032] Figure 5 It is a schematic diagram of parameterized variable aggregation of the present invention;

[0033] Figure 6 It is a schematic diagram of the driving relationship of the parameterized variables of the present invention;

[0034] Figure 7 It is a schematic diagram of the skeleton of the single-bridge chassis of the present invention;

[0035] Figure 8 It is a schematic diagram of the skeleton of the double-bridge chassis of the present invention;

[0036] Fig. 9 is a schematic diagram of a front enclosure frame with front enclosure shutters of the present invention;

[0037] Fig.10 Schematic diagram of a front enclosure frame without front enclosure shutters of the present invention;

[0038] Fig.11 It is a schematic diagram of the rear enclosure framework of the present invention;

[0039] Fig.12 It is a schematic diagram of the left side surrounding frame of the present invention;

[0040] Fig.13 is a schematic diagram of the ceiling framework of the present invention;

[0041] Fig.14 It is a schematic diagram of the skeleton of the single bridge lower cabin of the present invention;

[0042] Fig.15 It is a schematic diagram of the skeleton of the double-bridge lower cabin of the present invention;

[0043] Fig.16 It is a parametric modeling design flow chart of the left side of the present invention;

[0044] Fig.17 It is a parametric modeling design flow chart of blinds.

[0045] Description of the drawings: 1- chassis, 2- left side panel, 3- front panel, 4- rear panel, 5- right side panel, 6- ceiling, 7- lower cabin, 11- chassis cross beam, 12- multiple chassis longitudinal beams, 13- center line of rear axle, 21- left side panel shutter, 22- first side door, 23- second side door, 24- side vertical frame, 25- side transverse frame, 26- surrounding frames, 31- front panel shutter, 32- front panel vertical frame, 33- front panel transverse frame, 41- movable cover, 42- rear double doors, 61- ceiling shutter, 62- filling port, 63- silencer, 64- top longitudinal frame, 65- top transverse frame. DETAILED DESCRIPTION

[0046] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but the embodiments of the present invention are not limited thereto.

[0047] Figure 1-17 It is a preferred embodiment of the present invention. The present invention is a design method for a power supply vehicle compartment. Figure 1-3 As shown, the power supply vehicle compartment is mainly composed of six parts: chassis 1, left side enclosure 2, front enclosure 3, rear enclosure 4, right side enclosure 5 and ceiling 6. All six parts are provided with a frame. The left side enclosure 2 is provided with a left side enclosure shutter 21, a first side door 22 and a second side door 23, and a lower cabin 7 is provided below; the front enclosure shutter 31 can be provided on the front enclosure 3; the rear enclosure shutter (not shown in the figure) can be provided on the rear enclosure 4. If the rear enclosure shutter is not provided, a movable cover 41 can be provided, and a rear double door 42 is also provided; the right side enclosure 5 is the same as the left side enclosure 2, and the ceiling 6 is provided with a ceiling shutter 61, a muffler and a liquid filling port (not shown in the figure). The six parts of the compartment are all composed of a frame plus a mask. The frame is a frame type, and corresponding shutters and doors are reserved for installation.

[0048] A parametric modeling design method for a power supply vehicle compartment is a top-down and bottom-up hybrid parametric modeling method based on SolidWorks software, including two parts: skeleton parameterization and general parts configuration parameterization. The specific method of modeling design includes the following steps:

[0049] Step 1: Determine the overall layout of the vehicle, such as Figure 1-3 As shown, the variable parameters required for the carriage parameterization are determined according to the general layout diagram; the variable parameters of the carriage are divided into three parts: the overall parameters of the carriage, the six major pieces of related parameters and the lower cabin parameters, each part includes different variable parameter sub-items;

[0050] like Figure 4 As shown, the overall parameters of the carriage are the overall dimensions of the carriage (length L, width W, height H), rear overhang, wheelbase, etc.; the six major related parameters include variable parameter items of chassis 1, left side panel 2, front panel 3, rear panel 4, right side panel 5 and ceiling 6, among which the variable parameter items of left side panel 2 include the specification and position parameters of left side panel blinds 21, the specification and position parameters of the first side door 22, the specification and position parameters of the second side door 23, etc.; the front panel 3 needs to determine whether there are front panel blinds 31, the specification and position parameters of the front panel blinds 31, two variable parameter items; the rear panel 4 needs to determine whether there are rear panel blinds, the specification and position parameters of the rear panel blinds, and the movable cover 41 The variable parameter items include the specification parameters of the rear double door 42 and the specification parameters of the rear double door 42; the variable parameter items of the right side panel 5 are the same as the variable parameter items of the left side panel 2. The left side panel 2 and the right side panel 5 may also be provided with air doors and observation windows (not shown in the figure), and the specifications and position parameters of the air doors and observation windows; the variable parameter items of the ceiling 6 include the specifications and position parameters of the ceiling shutters 61, the specifications and position parameters of the muffler and the position parameters of the filling port; the parameters of the lower cabin 7 include the lower cabin height parameters, the specifications and positioning dimensions of the tire guard plate, the number of cabin doors and the specifications and positioning dimensions of each cabin door, the specifications and positioning dimensions of the flip ladder and other variable parameter items.

[0051] Step 2: Analyze the variable parameters of the car body parametric design system and divide the parameter variables into two parts: skeleton parameterization and general parts configuration parameterization, such as Figure 5 As shown in the figure, the skeleton parameterization mainly establishes the skeleton model of the whole vehicle, the global variable parameters of the whole vehicle, including the installation opening parameters of the optional universal parts, and the universal parts configuration mainly includes the characteristics of the universal parts and the external dimensions and specifications of the parts, as well as the parameters of the driving skeleton opening (size, position and other information);

[0052] Step 3: Use top-down and bottom-up mixed parametric drive to establish parametric models of each frame of the car body; the frame parametric model is mainly determined by the overall parameters of the car body and the general parts configuration, among which the overall parameters of the car body determine the external dimensions of each frame, that is, the external dimensions of each large piece and the general estimation model are driven from top to bottom through global variables, and the general parts configuration determines the size and position of the frame openings, that is, the generation of the skeleton installation skeleton is driven from bottom to top through the general parts configuration parameters.

[0053] like Figure 6 As shown, the skeleton parameterized model includes six large skeletons and two parts of the lower cabin skeleton. The six large skeletons include the chassis 1 skeleton, the left side wall 2 skeleton, the front wall 3 skeleton, the rear wall 4 skeleton, the right side wall 5 skeleton and the ceiling 6 skeleton. The lower cabin skeleton 7 includes the left lower cabin skeleton and the right lower cabin skeleton. The steps to establish each cabin skeleton are as follows:

[0054] S1: Establish a unified reference plane. The front view reference plane is the main view plane of the component. The top view reference plane is preferably centered or bottom. The right view reference plane is the center position of the component.

[0055] According to the specifications, dimensions and structural forms of the conventional power vehicle body, columns, etc., the relationship between the dimensions of the frame of each large piece and the overall parameters of the carriage can be obtained as shown in Table 1:

[0056] Table 1 Relationship between frame dimensions and overall parameters of carriage

[0057] length Width / Height Base <![CDATA[L dj =L-55]]> <![CDATA[W dj =W-10]]> Front <![CDATA[H qw =H1+H2+10]]> <![CDATA[W qw =W]]> Back <![CDATA[L hw =H1+X+375]]> <![CDATA[W hw =W]]> Left side <![CDATA[L zcw =L-270]]> <![CDATA[H zcw =H1]]> Right side <![CDATA[L ycw =L-270]]> <![CDATA[H ycw =H1]]> ceiling <![CDATA[L dp =L-50]]> <![CDATA[W dp =W]]> Lower Deck <![CDATA[L xc =L-270]]> <![CDATA[H xc =H2-20]]>

[0058] Where: L is the length of the car; W is the width of the car (excluding wheel arches); H1 is the height of the side wall; H2 is the height of the lower door; L dj is the chassis length, W dj is the width of the chassis; H qw is the front height, W qw L is the width of the front; hw is the back length, W hw L is the width of the back; zcw is the left side length, H zcw L is the left side height; ycw is the right side length, H zcw is the right side height; L dp is the ceiling length, W dp is the width of the ceiling; L xc is the length of the lower cabin, H xc is the lower cabin altitude.

[0059] S2: Determination of the skeleton parameters of the chassis 1

[0060] The frame of the chassis 1 is divided into Figure 7 The single-axle chassis shown and Figure 8 The double-axle chassis shown in the figure are composed of multiple chassis cross beams 11 and multiple chassis longitudinal beams 12. The internal function relationship of the size is shown in Table 2. The chassis cross beams 11 are based on the rear axle centerline 13. The chassis cross beams 11 from the rear axle centerline 13 to the front end of the chassis are evenly distributed with A1 as the spacing. The number of arrays is D A1 ; The chassis crossbeam 11 from the rear axle centerline 13 to the rear end of the chassis is evenly distributed with a spacing of B1, and the number of arrays is D B1To ensure that the tire bounce does not interfere with the chassis crossbeam 11, no crossbeam is arranged at the center line 13 of the rear axle, and the spacing between the two chassis crossbeams 11 before and after the center line 13 of the rear axle is controlled to be 800 mm. To ensure that the riding screw can be inserted into the crossbeam, the spacing between other chassis crossbeams 11 is generally about 500 mm. According to the specifications and structural forms of conventional chassis profiles, the internal function relationship table of chassis dimensions can be obtained in Table 2. The chassis skeleton design process is driven by the global variables L and W in the general assembly in SolidWorks according to the rules in Table 2 to achieve top-down parametric drive.

[0061] Table 2 Internal function relationship table of chassis size

[0062]

[0063] Where: L is the length of the car; W is the width of the car (excluding wheel arches); L dj is the chassis length, W dj is the chassis width; A1 is the beam spacing at the front end of the rear axle center; B1 is the beam spacing at the rear end of the rear axle center; C1 is the distance from the rear axle center to the rear end; F1 is the rear axle wheelbase, and the value is 0 when the rear axle is single; E1 is the chassis beam width; D A1 is the number of arrays of the front chassis beams 11, D B1 is the number of arrays of the rear end chassis cross beams 11 .

[0064] S3: Determination of the skeleton parameters of the front 3

[0065] The frame of the front 3 is mainly divided into: Fig. 9 The front shutter 31 and the Fig.10 The two types of blinds shown are composed of front wall vertical frames 32 and front wall transverse frames 33, the spacing between the front wall transverse frames 33 is A2, the spacing between the front wall vertical frames 32 is B2, and D A2 is the array number of the front wall cross frame 33. The internal relationship of the frame size of the front wall 3 is shown in Table 3, where the outer dimensions and internal frame are driven by the global variables W, H1 and H2 in the general assembly in SolidWorks according to a certain rule to achieve top-down parametric driving.

[0066] Table 3 Internal relationship table of front frame dimensions

[0067]

[0068] Where: W is the width of the car (excluding wheel arches); H1 is the height of the side wall; H2 is the height of the lower door; H qw is the front height, W qw H is the width of the front; qbis the height of the front blinds; A2 is the horizontal frame spacing; B2 is the vertical frame spacing; C2 is the distance between the uppermost horizontal frame and the lowermost horizontal frame; D A2 is the number of arrays of the front cross frame 33 .

[0069] Whether the front shutter 31 of the front panel 3 has a hole is determined by whether the front shutter 31 is configured or not in combination with the SolidWorks function drive, and the size of the hole is driven by the sketch size (the width and length change with the configuration) in the front shutter 31 configuration assembly, thereby realizing that the skeleton of the front panel 3 is driven by the front shutter 31 configuration, that is, a bottom-up parametric driven modeling method.

[0070] S4: Determination of the skeleton parameters of the rear enclosure 4

[0071] like Fig.11 As shown in the figure, the rear enclosure 4 skeleton is mainly determined by the vehicle width, rear double door height, rear enclosure ground clearance, etc., among which the license plate width is generally fixed at 717mm, and the rear enclosure external dimensions are parameterized and driven from top to bottom by global variables. The double door height and license plate height inside the skeleton are designed based on the presence or absence of corresponding component configurations and sketch dimensions, thus realizing bottom-up parameterized driven modeling.

[0072] S5: Determination of side frame parameters

[0073] like Fig.12 As shown, the internal relationship of the frame of the left side 2 and the right side 5 is similar. Taking the left side 2 as an example, the side frame is mainly composed of the side vertical frame 24 and the side horizontal frame 25. The openings are determined corresponding to the side shutter, the left door, the empty door and the emergency stop position. In order to keep the skin width of the side vertical frame 24 consistent with the plate, the spacing B3 of the side vertical frame 24 is fixed to 500mm, and the number of arrays is D B3 , the side horizontal frame 25 is evenly divided according to the side height, with a spacing of A3; after the opening, it is necessary to add a surrounding frame 26, and the surrounding frame 26 has two forms: one is the side horizontal frame cutting the side vertical frame, such as the side door opening frame; the other is the side vertical frame cutting the side horizontal frame, such as the shutter opening frame. The frame parameter relationship of the left side wall 2 is shown in Table 4. The parameter relationship of the position and size of the left door, empty door, observation window, etc. is similar to that of the left side wall shutter 31.

[0074] Table 4 Internal relationship table of left side frame size

[0075] project Functional relationship <![CDATA[H zcw ]]> <![CDATA[H1]]> <![CDATA[L zcw ]]> L-270 A3 <![CDATA[(H zcw -60) / 4]]> <![CDATA[D B3 ]]> <![CDATA[Int((L zcw -40) / 500)]]> <![CDATA[L zbq ]]> <![CDATA[500*(Int((L zb -IN zb ) / 500)+1)+20]]> <![CDATA[L zbh ]]> <![CDATA[500*(Int((L zb +W zb ) / 500)+1)-20]]>

[0076] Where: H zcw H1 is the height of the left side panel, L is the height of the side panel; zcw is the length of the left side panel, L is the length of the car body; A3 is the spacing of the side cross frames, D B3 is the number of side vertical skeleton arrays; L zbqL is the distance from the front end of the left side shutter to the front end of the left side frame. zbh L is the distance from the rear end of the left side shutter to the front end of the left side frame. zb W is the distance from the longitudinal centerline of the left side shutter to the front end of the left side frame. zb Height of the left side perimeter shutter.

[0077] S6: Determine the frame parameters of the ceiling 6

[0078] like Fig.13 As shown, the frame of the roof 6 is mainly determined by parameters such as the vehicle length and width. The position and size of the roof shutter 61, the liquid filling port 62 and the muffler 63 are driven by the presence or absence of corresponding components to achieve bottom-up parameter-driven modeling. The roof frame is mainly composed of a top longitudinal frame 64 and a top transverse frame 65. The openings are determined corresponding to the positions of the ceiling shutters, the liquid filling port and the muffler. In order to keep the skin width of the top longitudinal frame 64 consistent with the plate, the spacing B6 of the top longitudinal frame 64 is fixed to 500mm, and the number of arrays is D. B6 The top cross frame 65 is evenly divided according to the ceiling height, and the spacing is A6. The frame parameter relationship of the ceiling 6 is shown in Table 5. The parameter relationship of the ceiling shutter 61 and the muffler 63 is similar to that of the liquid filling port 62.

[0079] Table 5 Internal relationship table of ceiling frame dimensions

[0080] project Functional relationship <![CDATA[W dp ]]> W <![CDATA[L dp ]]> L-50 A6 <![CDATA[W dp / 4]]> <![CDATA[D B6 ]]> <![CDATA[Int((L dp -40) / 500)]]> <![CDATA[L jykq ]]> <![CDATA[500*(Int((L jyk -200) / 500)+1)+20]]> <![CDATA[L jykh ]]> <![CDATA[500*(Int((L jyk +200) / 500)+1)-20]]>

[0081] Where: W is the width of the car (excluding wheel arches), W dp is the width of the roof; L is the length of the carriage, L dp is the length of the ceiling; A6 is the spacing of the top cross frame 65, L jykq L is the distance from the front end of the filling port to the front end of the ceiling frame; jyk L is the distance between the horizontal center line of the filling port and the horizontal center line of the ceiling; jykh The distance from the rear end of the filling port to the front end of the ceiling frame.

[0082] S7: Determination of the skeleton parameters of the lower cabin 7

[0083] The lower cabin 7 is divided into a left lower cabin and a right lower cabin. The structures of the left lower cabin and the right lower cabin are similar, and the left lower cabin is taken as an example. Fig.15 , Fig.16As shown, the lower cabin 7 is divided into two types: single bridge and double bridge. The width W72 of the tire guard corresponds to two fixed sizes for single bridge and double bridge. The total height, wheelbase and rear overhang of the lower cabin 7 are determined by the global variables L and H2. The specific layout is determined by the door configuration. The corresponding model skeleton width is driven from bottom to top by the door configuration. The number of doors at the rear of the conventional power supply vehicle is 1, and the number of doors at the front end of the tire guard (the flip ladder is also a kind of door) may be 1, 2, or 3. The specific number is optional through configuration. The figure below shows the case of the most doors in the conventional power supply vehicle. When the number of doors is 0, the corresponding door width is 0. The other internal dimension relationship formulas are shown in Table 6.

[0084] Table 6 Internal relationship table of left lower cabin frame dimensions

[0085]

[0086]

[0087] Where: H xc is the lower cabin height, L xc is the height length of the lower cabin, H2: the height of the lower cabin door, L is the length of the car; L71 is the distance from the center line of the tire guard to the adjacent boundary of the adjacent cabin door; W72 is the width of the tire guard, L72 is the distance from the center line of the rear wheel of the tire guard to the rear side of the lower cabin adjacent to the rear; L73 is the distance from the center line of the rear wheel of the tire guard to the rear end of the lower cabin; W71, W73, W74, W75 are the widths of the lower cabin door respectively, marked in order from back to front, L71, L72, L74, L75, L76 are the distances from the center line of the rear wheel of the tire guard to the boundary of the lower cabin door respectively; W76, W77 are the widths of the front end cover plate and the rear end cover plate respectively.

[0088] like Fig.17 As shown in the figure, the frame layout design steps are explained by taking the side frame as an example:

[0089] 1) First, according to the vehicle appearance parameters, the length and width parameters of the side panel frame size can be determined;

[0090] 2) Based on the processing technology and raw material specifications, the side vertical frame ensures the panel width of 1000mm + 4mm gap layout, and two horizontal linings are evenly distributed, thus determining the preliminary internal frame layout parameters;

[0091] 3) Determine the size and position of the openings of the side common parts (doors, windows, etc.) according to the general layout. For example, if the blinds 1 is configured as configuration 1, determine the blinds opening position and size according to the sketch size and position parameters in configuration 1, and then add the installation frame of blinds configuration 1; if the blinds 1 is configured as none, no operation is required, and enter the judgment and operation of the next optional configuration;

[0092] 4) Obtain the final side frame model parameters.

[0093] When actually drawing the model, you can first comprehensively consider the layout of conventional power supply vehicles, determine the most complex layout of the side panel frame (that is, the maximum number of shutters, the maximum number of side doors, the maximum number of empty doors, etc.), first draw all the most complex layouts into the side panel, and then make a configuration judgment. If the configuration exists, perform the corresponding opening and supplementary frame operations. If the configuration does not exist, compress the corresponding operations that have been drawn.

[0094] Step 4: Parameterization of general parts configuration. Parameterization of general parts configuration mainly configures parts of the same structure but different sizes and provides them to the overall model for optional installation. The configuration includes the features of the general parts and the dimensions and specifications of the parts. The feature is a simplified .part model with non-editable information such as weight, density, and geometric parameters. This can not only build a parametric model and reduce the hardware requirements when the model is running, but also avoid arbitrary editing.

[0095] like Fig.17 As shown in the figure, the overall principle of general part configuration parameterization is introduced by taking the blinds as an example. The configuration of other general parts is similar to this principle. The blinds assembly is assembled from single blinds parts. Each blind is a .part file exported from the corresponding blinds. This file contains the corresponding features and properties (density, quality, name, specifications, etc.). Then, it is assembled according to specific requirements, and different configurations are created. Each configuration only retains the corresponding blinds .part model, and the other models are compressed. At the same time, a sketch is created for the assembly. The sketch draws a rectangle, and the length and width of the rectangle are the same as the outer dimensions of the corresponding configuration blinds .part model; when the configuration is none, the blinds .part model is compressed, and the same assembly rules need to be followed during assembly:

[0096] Rule 1: All shutter .part models have a unified reference surface;

[0097] Rule 2: All selected assembly faces are assembled from the front view, top view, and right view. It is not allowed to select face assembly related to the shutter features.

[0098] Rule 3: Create the corresponding configuration. "None" means no blinds, and compress all .parts. Other configurations only keep the corresponding blinds, and compress all other blinds .parts.

[0099] Rule 4: Create a sketch in the assembly, draw a rectangular frame in the sketch, set the rectangular dimensions to vary with configuration, and the dimension values ​​correspond to the blinds' dimensions L and H;

[0100] Rule 5: Modify the properties of the corresponding configuration. The properties must be set to be specific to the configuration to ensure that the properties correspond to the corresponding blinds when using different configurations. In this way, when the engineering drawing is produced, the details columns of different configurations can correspond one to one.

[0101] After the assembly shutter is created, the configuration into the carriage assembly can only be assembled with the front view, top view and right view in the assembly, and the equation link is established. The equation link can only establish a relationship with the sketch L and H in the shutter.sidasm, which can ensure that the shutter will not have errors at any time. After assembly, the corresponding configuration can be selected as needed. The general parts configuration library established by the above method has the following characteristics: it cannot be edited, the model is simplified, the hardware requirements are low, and new configurations can be quickly added.

[0102] Step 5: Input the skeleton parameters and general configuration parameter variables into the parametric model to be developed;

[0103] Step 6: The final required 3D model of the power vehicle compartment is calculated from within the parametric model.

[0104] The establishment of the relationship function of the present invention is mainly through sorting out the common power supply vehicle structure, the common design methods and experience of the power supply vehicle compartment, the common parts and their geometric parameters, the common material geometric parameters, etc., to establish the overall model parameters and the relationship function between the major pieces, find out the frequently changed variables as the top-down driving parameters, and establish the internal function relationship of the design. At the same time, a set of simplified model configuration libraries of common parts are established as the bottom-up driving variables, and the internal function relationship of the design is established.

[0105] The main function of this method is to allow designers to repeat modeling according to certain rules and steps, and then quickly and automatically modeling according to certain rules and steps. This can greatly reduce the repetitive workload of designers, thereby improving work efficiency, reducing fulfillment time, and also reducing the error rate of designers. The use of this model reduces the requirements for designers' professional knowledge and experience, and new employees can quickly get into work.

[0106] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A parametric modeling design method for a power supply vehicle compartment, wherein the power supply vehicle compartment is mainly composed of six parts: a chassis, a left side enclosure, a front enclosure, a rear enclosure, a right side enclosure and a ceiling, wherein the six parts are all provided with a frame, the left side enclosure is provided with a left side enclosure shutter, a first side door and a second side door, and a lower cabin is provided below; the front enclosure can be provided with a front enclosure shutter; the rear enclosure can be provided with a rear enclosure shutter or a movable cover plate, and is also provided with a rear double door; the right side enclosure is the same as the left side enclosure, and the ceiling is provided with a ceiling shutter, a muffler and a liquid filling port; Its characteristics are: The modeling design includes two parts: skeleton parameterization and general parts configuration parameterization. The specific method includes the following steps: Step 1: Determine the overall layout of the vehicle, and determine the variable parameters required for the car body parametric determination based on the overall layout; the car body variable parameters are divided into three parts: car body overall parameters, six major pieces related parameters and lower cabin parameters, each part includes different variable parameter sub-items; Step 2: Analyze the variable parameters of the car body parametric design system and divide the parameter variables into two parts: skeleton parameterization and general parts configuration parameterization; Step 3: Use top-down and bottom-up hybrid parametric drive to establish parametric models of each frame of the carriage; the parametric model of the frame includes two major parts: six large-piece frames and a lower cabin frame, wherein the six large-piece frames include a chassis frame, a left side frame, a front side frame, a rear side frame, a right side frame and a roof frame, and the lower cabin frame includes a left lower cabin frame and a right lower cabin frame; Step 4: Parameterization of general parts configuration, making parts of the same structure but different sizes into configurations, and providing them to the overall model for optional installation. The configuration includes the features of the general parts and the dimensions and specifications of the parts, where the feature is a simplified .part model; Step 5: Input the skeleton parameter variables and the general configuration parameter variables into the parameterized model of step 3 and step 4; Step 6: The final required 3D model of the power vehicle compartment is calculated from within the parametric model.

2. A parametric modeling design method for a power supply vehicle compartment according to claim 1, characterized in that: The skeleton parameterization described in step 2 is mainly to establish the skeleton model of the whole vehicle and the global variable parameters of the whole vehicle, including the installation opening parameters of the optional universal parts. The universal parts configuration mainly includes various universal parts configurations, including the characteristics of universal parts and the external dimensions and specifications of the parts, as well as the parameters for driving the skeleton openings.

3. A parametric modeling design method for a power supply vehicle compartment according to claim 1, characterized in that: The skeleton parameterized model described in step three is mainly determined by the overall parameters of the car body and the general parts configuration, wherein the overall parameters of the car body determine the external dimensions of each skeleton, that is, the external dimensions of each large piece and the general estimation model are driven from top to bottom through global variables, and the general parts configuration determines the size and position dimensions of the skeleton openings, that is, the generation of the skeleton installation skeleton is driven from bottom to top through the general parts configuration parameters.

4. A parametric modeling design method for a power supply vehicle compartment according to claim 3, characterized in that: The steps for establishing each frame of the carriage described in step 3 are as follows: S1: Establish a unified reference plane. The front view reference plane uses the main view plane of the component. The top view reference plane is preferably centered or bottom. The right view reference plane is centered on the component. The overall parameter relationship of the car body is established based on the global variables L, W, H1 and H2. S2: Determine chassis skeleton parameters and establish chassis size internal function relationship table; the chassis skeleton is divided into single-bridge chassis and double-bridge chassis, both of which are composed of multiple chassis cross beams and multiple chassis longitudinal beams. The chassis cross beams are based on the center line of the rear axle, and the chassis cross beams from the center line of the rear axle to the front end of the chassis are designed to be evenly distributed with A1 as the spacing; the chassis cross beams from the center line of the rear axle to the rear end of the chassis are designed to be evenly distributed with B1 as the spacing; no chassis cross beams are arranged at the center line of the rear axle, and the spacing between the two chassis cross beams before and after the center line of the rear axle is 800mm; the design process is driven by global variables L and W to achieve top-down parameterized drive; S3: Determine the parameters of the front enclosure frame and establish an internal relationship table of the front enclosure frame size; the front enclosure frame is divided into two types: with front enclosure shutters and without shutters, and is composed of a front enclosure vertical frame and a front enclosure horizontal frame evenly distributed, the spacing of the front enclosure horizontal frames is A2, and the spacing of the front enclosure vertical frames is B2; the design process is driven by global variables W, H1 and H2 to achieve top-down parameterization drive; S4: Determine the parameters of the back frame; S5: Determine the side frame parameters and establish the internal relationship table of the side frame size; the side frame is mainly composed of a side vertical frame and a side transverse frame, the spacing of the side vertical frames is 500mm, and the side transverse frames are evenly divided according to the side frame height, with a spacing of A3; the design process is driven by global variables L and H1 to achieve top-down parameterization drive; S6: Determine the ceiling frame parameters and establish the internal relationship table of the ceiling frame size; the ceiling frame is mainly composed of a top longitudinal frame and a top transverse frame, the top longitudinal frame has a spacing of 500mm, and the top transverse frame is evenly divided according to the ceiling height, with a spacing of A6; the design process is driven by global variables L and W to achieve top-down parametric drive; S7: Determine the lower cabin skeleton parameters and establish an internal relationship table of the lower cabin skeleton dimensions; the lower cabin is divided into two types: single bridge and double bridge, which are determined by global variables L and H2 to achieve top-down parametric drive.

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