Pantograph intensity calculation modeling method, calculation method, equipment, medium and product

Abstract

The invention discloses a pantograph strength calculation modeling method, a calculation method, equipment, a medium and a product. The modeling method comprises the following steps: constructing a pantograph finite element model; constructing a pantograph lifting device finite element model based on the pantograph finite element model; based on the pantograph finite element model and the pantograph lifting device finite element model, establishing bolt connection between a bottom plate of an air bag and an air bag mounting seat on a pantograph underframe, and establishing column hinge connection between a hinge end of a driving rod and a driving rod support on the pantograph underframe; rigid connection is established between the steel wire rope and the clamping groove of the adjusting plate and between the steel wire rope and the steel wire rope fixing support on the pantograph lower arm rotating shaft, and a pantograph strength calculation model comprising the pantograph lifting device is obtained. According to the method, during pantograph strength calculation, the real stress state of the pantograph and the pantograph lifting device can be reflected, the real stress state of the connecting part of the pantograph and the pantograph lifting device can also be reflected, and the pantograph strength calculation precision is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of simulation computing, and in particular relates to a pantograph strength calculation modeling method, a calculation method, a device, a storage medium and a product. Background Art

[0002] The pantograph is a current collecting device for electrified rail transit, which obtains various power sources including power from the contact network through the pantograph. When the rail vehicle is running, the pantograph needs to be raised to the working height and always maintained at the working height so as to continuously obtain power from the contact network with a constant height. The pantograph needs to be raised from the bow-dropping height to the working height with the help of a pantograph raising device, and also needs to rely on the bow-raising force continuously provided by the pantograph raising device to keep the pantograph at the working height.

[0003] Figure 1 The main structure of the pantograph raising device is shown, which includes a driving rod 1, an airbag 2, a butterfly seat 3, a wire rope mounting seat 4, a wire rope 5, etc. From the appearance, the airbag is mainly composed of a bottom plate, a leather bag and a top plate, and the bottom plate and the top plate each have 4 studs. A bolt connection is established between the airbag bottom plate and the airbag mounting seat on the pantograph chassis; the fixed end of the driving rod 1 is hinged to the pantograph chassis beam, and the movable end of the driving rod 1 is bolted to the wire rope mounting seat 4, and a certain position in the middle of the driving rod 1 is supported on the butterfly seat 3, and the butterfly seat 3 is fixed on the airbag top plate. The wire rope mounting seat 4 is used to fix the wire rope 5, and the middle section of the wire rope 5 is fixed in the slot of the wire rope mounting seat 4, and the two ends of the wire rope 5 are fixed to the pantograph lower arm rotating shaft by bolts, and several length sections on both sides of the middle section are placed in the slots of two adjustment plates.

[0004] When the pantograph is raised, the airbag 2 is filled with high-pressure gas, and the airbag 2 expands and stretches. At this time, the airbag 2 generates thrust on the driving rod 1, and the airbag 2 pushes the driving rod 1 to rotate around the hinged end, so that the movable end of the driving rod 1 pulls the wire rope 5 through the wire rope mounting seat 4. Under the tension of the wire rope 5, the lower arm shaft of the pantograph rotates, so that the pantograph is raised to the working height. Under normal circumstances, the pantograph has only one degree of freedom of movement during the process of raising and lowering the pantograph. When the pantograph is raised to the working height, the pantograph head slide plate will touch the contact network, and the pantograph raising action stops. At this time, under the action of the pantograph raising force continuously provided by the airbag 2, the pantograph is in a balanced state at the working height. During the process of lowering the pantograph, the airbag 2 is deflated, the pantograph raising force disappears, and the pantograph head slide plate is separated from the contact network under the action of gravity. The pantograph moves downward until the pantograph head falls to the pantograph head support of the pantograph chassis. At this time, the pantograph stops moving and is in a balanced state at the pantograph lowering position. The strength calculation of the pantograph only needs to calculate the strength of the pantograph in a balanced state at the working height. Usually, the pantograph finite element calculation model is established according to the normal working height of the pantograph, and then the corresponding boundary conditions are applied according to the specified working conditions to perform the strength calculation.

[0005] The specific function of the pantograph lifting device is to provide the pantograph lifting force, which is further converted into the pantograph lifting torque, so that the lower arm of the pantograph rotates, thereby raising the pantograph and maintaining it at the working height. From the existing pantograph strength calculation, when establishing the pantograph strength calculation model, in order to simplify the model, the pantograph lifting device calculation model is not established. In order to replace the function of the pantograph lifting device, the pantograph lifting torque is directly applied to the rotating shaft of the lower arm of the pantograph, and the vertical limit constraint is applied to the top surface of the pantograph head slide plate, so that the pantograph is in a balanced state at the working height. Figure 2 The pantograph strength calculation model established by ignoring the pantograph lifting device is shown. It can be seen that in the strength calculation model, the pantograph lifting torque is directly applied to the pantograph lower arm rotation shaft to replace the pantograph lifting torque generated by the pantograph lifting device. Figure 3 The stress cloud diagram of the pantograph chassis obtained by the pantograph strength calculation model established by ignoring the pantograph lifting device is shown. This modeling method has the following shortcomings:

[0006] (1) Since the pantograph lifting torque is directly applied to the lower arm shaft of the pantograph, the pantograph lifting device, which is a force transmission link, is removed, resulting in the calculation results being unable to reflect the actual stress conditions of the pantograph lifting device, the airbag mounting beam, and the drive rod mounting structure;

[0007] (2) The bending and shearing effects of the wire rope tension on the pantograph lower arm shaft were not considered;

[0008] (3) Since there is no wire rope calculation model, it is impossible to calculate the tension of the wire rope in the pantograph lifting device, and thus it is impossible to provide a calculation basis for the selection of the wire rope;

[0009] (4) The vertical constraint imposed by the bow head slide can easily cause additional stress on the slide. Summary of the invention

[0010] The purpose of the present invention is to provide a pantograph strength calculation modeling method, calculation method, equipment, medium and product to solve the problem that the traditional pantograph strength calculation method ignores the pantograph lifting device, resulting in the inability to truly reflect the stress condition of the pantograph lifting device itself and the tension condition of the wire rope, and also fails to truly reflect the stress condition of other components closely connected to the pantograph lifting device.

[0011] The present invention solves the above technical problems through the following technical solutions: A pantograph strength calculation modeling method, comprising:

[0012] Construct a finite element model of the pantograph;

[0013] Based on the pantograph finite element model, construct a pantograph lifting device finite element model;

[0014] Based on the pantograph finite element model and the pantograph lifting device finite element model, a bolt connection is established between the bottom plate of the airbag and the airbag mounting seat on the pantograph chassis, a column hinge connection is established between the hinged end of the drive rod and the drive rod support on the pantograph chassis, and a rigid connection is established between the wire rope and the slot of the adjustment plate and between the wire rope and the wire rope fixing support on the pantograph lower arm rotating shaft, so as to obtain a pantograph strength calculation model including the pantograph lifting device.

[0015] The pantograph strength calculation model constructed by the present invention includes a pantograph lifting device. When calculating the pantograph strength, it can not only reflect the actual stress state of the pantograph and the pantograph lifting device itself, but also reflect the actual stress state of the components connected to the pantograph lifting device, thereby improving the calculation accuracy of the pantograph strength and providing a reliable basis for the design of the pantograph and the components of the pantograph lifting device.

[0016] Furthermore, when constructing the finite element model of the bow lifting device, a rigid connection is established between the wire rope and the slot of the wire rope mounting seat, a bolt connection is established between the top plate of the airbag and the butterfly seat, a bolt connection is established between the butterfly seat and the driving rod, and a bolt connection is established between the movable end of the driving rod and the wire rope mounting seat.

[0017] Furthermore, when constructing the finite element model of the bow hoisting device, the first section steel wire rope model, the second section steel wire rope model, the third section steel wire rope model and the fourth section steel wire rope model are used to simulate the steel wire rope;

[0018] The construction process of the first section steel wire rope model and the second section steel wire rope model is as follows:

[0019] Find the common tangent line between one of the vertical arc grooves of the wire rope mounting seat and the vertical slot of the corresponding adjustment plate, establish a beam unit or a rod unit between the two tangent points of the common tangent line, and obtain the first wire rope model;

[0020] Find the common tangent line between another vertical arc groove of the wire rope mounting seat and the vertical slot of the corresponding adjustment plate, establish a beam unit or a rod unit between the two tangent points of the common tangent line, and obtain the model of the second wire rope segment;

[0021] The construction process of the third section steel wire rope model and the fourth section steel wire rope model is as follows:

[0022] A beam unit or a rod unit is established between the slot of one of the adjustment plates and the corresponding fixing hole of the wire rope fixing support on the rotating shaft of the lower arm of the pantograph to obtain a model of the third wire rope segment;

[0023] A beam unit or a rod unit is established between the card slot of another adjustment plate and the corresponding fixing hole of the wire rope fixing support on the rotating shaft of the lower arm of the pantograph to obtain the fourth wire rope model.

[0024] Furthermore, the first end nodes of the first section wire rope model and the second section wire rope model respectively establish a rigid connection with the slot of the wire rope mounting seat; the second end nodes of the first section wire rope model and the second section wire rope model respectively establish a rigid connection with the slot of the corresponding adjustment plate; the first end nodes of the third section wire rope model and the fourth section wire rope model respectively establish a rigid connection with the slot of the corresponding adjustment plate; the second end nodes of the third section wire rope model and the fourth section wire rope model respectively establish a rigid connection with the wire rope fixing support on the rotating shaft of the pantograph lower arm.

[0025] Furthermore, when constructing the finite element model of the bow lifting device, the construction process of the airbag model is as follows:

[0026] Construct the bottom plate shell unit model and top plate shell unit model of the airbag;

[0027] Establishing two coincident nodes A and B between the center of the bottom plate shell unit model and the center of the top plate shell unit model;

[0028] Establish multiple beam units between node A and multiple nodes evenly distributed in the bottom plate shell unit model; establish multiple beam units between node B and multiple nodes evenly distributed in the top plate shell unit model;

[0029] A column articulation unit AB is established between node A and node B, and the rotation axis direction of the column articulation unit AB is consistent with the rotation axis direction of the pantograph lower arm.

[0030] Furthermore, when constructing the finite element model of the bow lifting device, the construction process of the airbag model is as follows:

[0031] Construct the bottom plate shell unit model and top plate shell unit model of the airbag;

[0032] Establish two non-overlapping nodes A and B in the vertical direction between the center of the bottom plate shell unit model and the center of the top plate shell unit model;

[0033] Establish multiple beam units between node A and multiple nodes evenly distributed in the bottom plate shell unit model; establish multiple beam units between node B and multiple nodes evenly distributed in the top plate shell unit model;

[0034] A spring element is established between node A and node B.

[0035] Based on the same concept, the present invention also provides a pantograph strength calculation method, comprising:

[0036] Loading the pantograph strength calculation model including the pantograph raising device obtained by the pantograph strength calculation modeling method as described above;

[0037] Applying loads and boundary conditions to the pantograph strength calculation model according to the actual operating conditions of the pantograph;

[0038] The pantograph strength calculation model is simulated and calculated to obtain a stress distribution cloud diagram.

[0039] Based on the same concept, the present invention also provides an electronic device, including a memory, a processor, and a computer program / instructions stored in the memory, wherein the processor executes the computer program / instructions to implement the pantograph strength calculation modeling method or the pantograph strength calculation method as described above.

[0040] Based on the same concept, the present invention also provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the pantograph strength calculation modeling method or pantograph strength calculation method as described above.

[0041] Based on the same concept, the present invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the pantograph strength calculation modeling method or pantograph strength calculation method as described above.

[0042] Beneficial Effects

[0043] Compared with the prior art, the advantages of the present invention are:

[0044] The pantograph strength calculation model constructed by the present invention includes a pantograph lifting device. When calculating the pantograph strength, it can not only reflect the actual stress state of the pantograph and the pantograph lifting device itself, but also reflect the actual stress state of the components connecting the pantograph and the pantograph lifting device, thereby improving the calculation accuracy of the pantograph strength and reflecting the tension of the wire rope, providing a reliable basis for the design of the pantograph and the components of the pantograph lifting device.

[0045] The present invention adopts a simplified method to construct the models of the wire rope and the airbag, which reduces the modeling complexity, reduces the calculation difficulty, and improves the calculation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 2 is a schematic diagram of the structure of the bow raising device in an embodiment of the present invention;

[0048] Figure 2The pantograph strength calculation model established by ignoring the pantograph lifting device in the embodiment of the present invention;

[0049] Figure 3 In the embodiment of the present invention, Figure 2 The stress cloud diagram of the pantograph chassis obtained by the strength calculation model; the color code indicates the stress magnitude;

[0050] Figure 4 is a front view of a pantograph including a pantograph raising device according to an embodiment of the present invention;

[0051] Figure 5 is a top view of a pantograph including a pantograph raising device in an embodiment of the present invention;

[0052] Figure 6 is a bottom view of a pantograph including a pantograph raising device according to an embodiment of the present invention;

[0053] Figure 7 is a flow chart of a pantograph strength calculation modeling method according to an embodiment of the present invention;

[0054] Figure 8 is a finite element model of a pantograph without a pantograph raising device in an embodiment of the present invention;

[0055] Fig. 9 is a finite element model of the bow lifting device in an embodiment of the present invention;

[0056] Fig.10 It is a bottom view of the connection relationship between the four-section steel wire rope model and the steel wire rope mounting seat, the adjustment plate and the lower arm rotating shaft in the embodiment of the present invention;

[0057] Fig.11 It is a front view of the connection relationship between the four-section steel wire rope model and the steel wire rope mounting seat, the adjustment plate and the lower arm rotating shaft in the embodiment of the present invention;

[0058] Fig.12 It is a front view of the connection relationship between the pantograph raising device and the pantograph chassis in an embodiment of the present invention;

[0059] Fig.13 It is a pantograph strength calculation model including a pantograph raising device in an embodiment of the present invention.

[0060] Explanation of the accompanying drawings: 1-driving rod, 101-hinge end of driving rod, 102-movable end of driving rod, 2-airbag, 3-butterfly seat, 4-wire rope mounting seat, 5-wire rope, 501-first section wire rope model, 502-second section wire rope model, 503-third section wire rope model, 504-fourth section wire rope model, 6-adjustment plate, 7-adjustment plate mounting seat, 8-lower arm rotating shaft, 9-base frame, 10-driving rod support, 11-wire rope fixing support, 12-airbag mounting seat. DETAILED DESCRIPTION

[0061] The following is a clear and complete description of the technical solutions in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0063] Example 1

[0064] like Figures 4 to 6 As shown, the pantograph components are connected end to end from bottom to top, and the bow lifting force is gradually transmitted from the airbag 2 to the bow head slide in the order from bottom to top (airbag 2, drive rod 1, wire rope mounting seat 4, wire rope 5, lower arm shaft 8), so that the bow head slide is raised to the working height and contacts the contact network, and is maintained at the working height. When calculating the strength of the pantograph, it is necessary to establish a complete calculation model of the pantograph as much as possible to check whether all the components of the pantograph meet the strength requirements. Therefore, the bow lifting device as an important force transmission link cannot be ignored. Ignoring the bow lifting device not only fails to truly reflect the stress of the bow lifting device itself and the tension of the wire rope 5, but also fails to truly reflect the stress of other components closely connected to the bow lifting device (such as the drive rod support 10 and welding structure, airbag mounting seat 12, adjustment plate 6 and wire rope fixing support 11, etc.). Therefore, it is necessary to establish a calculation model of the bow lifting device when calculating the strength of the pantograph.

[0065] like Figure 7 As shown, a pantograph strength calculation modeling method provided by an embodiment of the present invention includes:

[0066] Step 1: Construct the pantograph finite element model.

[0067] In a specific implementation of the present invention, the specific construction process of the pantograph finite element model is as follows:

[0068] Step 1.1: Figures 4 to 6 As shown, a pantograph three-dimensional model is constructed according to the mechanical parameters of the pantograph;

[0069] Step 1.2: Use the Ansys platform to mesh the pantograph 3D model and obtain the pantograph finite element model, such as Figure 8 shown.

[0070] Step 2: Based on the pantograph finite element model, construct the pantograph lifting device finite element model.

[0071] like Figure 1 As shown in FIG. 1 , the bow lifting device mainly includes a driving rod 1, an airbag 2, a butterfly seat 3, a wire rope mounting seat 4 and a wire rope 5. When constructing the finite element model of the bow lifting device, the three-dimensional model of the bow lifting device is first constructed according to the mechanical parameters of the bow lifting device, and then the three-dimensional model of the bow lifting device is meshed using the Ansys platform, and the connection relationship between the internal components of the bow lifting device is established to obtain the finite element model of the bow lifting device, as shown in FIG. Fig. 9 shown.

[0072] In this embodiment, establishing the connection relationship between the internal components of the bow lifting device includes establishing a rigid connection between the wire rope 5 and the slot of the wire rope mounting seat 4, establishing a bolt connection between the top plate of the airbag 2 and the butterfly seat 3, establishing a bolt connection between the butterfly seat 3 and the driving rod 1, and establishing a bolt connection between the movable end 102 of the driving rod and the wire rope mounting seat 4.

[0073] A finite element model of the pantograph lifting device is constructed according to its specific structure, including establishing an inflation model of the rubber airbag 2 and using a solid model to simulate the steel wire rope 5. However, the pantograph lifting device established in this way will cause the entire pantograph strength calculation model to have nonlinearity of the rubber material of the airbag 2 and nonlinearity of the contact between the steel wire rope 5 and the slot, which greatly prolongs the solution time of the pantograph strength calculation model and may also lead to non-convergence of the solution due to nonlinear factors. In addition, if an inflation model of the rubber airbag 2 is established, fluid-solid coupling will also appear in the pantograph strength calculation model, which greatly increases the difficulty of solution.

[0074] In order to reduce the model scale of the pantograph lifting device, reduce the difficulty of solving the problem, and improve the calculation speed, the present invention uses a simplified method to simulate the steel wire rope 5 and the airbag 2. Since the pantograph strength calculation only requires the pantograph to remain stationary at the normal working height, and to examine whether the various components of the pantograph meet the strength requirements under the specified working conditions; at the same time, the airbag 2 is selected according to the pantograph design requirements to determine its stroke and thrust, and its strength does not need to be calculated. Therefore, the present invention uses a simplified method to simulate the steel wire rope 5 and the airbag 2, which will not affect the strength calculation results of other components of the pantograph.

[0075] There is only one steel wire 5 in the actual pantograph. The steel wire 5 is sequentially clamped in the clamping slot of the steel wire rope mounting seat 4 and the clamping slots of the two adjustment plates 6. Both ends of the steel wire rope 5 are fastened to the steel wire rope fixing support 11 welded to the lower arm rotating shaft 8 by bolts. During the lifting and lowering process of the pantograph, there is no relative sliding between the steel wire rope 5 and the clamping slot of the steel wire rope mounting seat 4 and the clamping slot of the adjustment plate 6. The clamping slot of the steel wire rope mounting seat 4 is roughly composed of three sections. The middle section is an arc groove in an approximately horizontal plane, and the two side sections are arc grooves in a vertical plane. The function of the middle arc groove is to lock and fix several length sections of the steel wire rope 5 in the middle by bolts. The function of the arc grooves distributed in the vertical planes on both sides is to limit the lateral movement of the steel wire rope 5 along the pantograph, ensure that the lateral spacing between the two sections of the steel wire rope 5 remains constant, and guide the two sections of the steel wire rope 5 to enter the clamping slots in the vertical direction of the two adjustment plates 6 respectively. After the two sections of wire rope 5 are introduced from the slots of the wire rope mounting seat 4 into the vertical slots of the two adjustment plates 6, they extend from the other end of the slots to the wire rope fixing support 11, and the two ends of the wire rope 5 are fastened to the wire rope fixing support 11 by bolts, and the wire rope fixing support 11 is welded to the lower arm shaft 8. The slots of the adjustment plate 6 are used to clamp the wire rope 5, and there is no sliding between the slots and the wire rope 5. When the bow is raised, the adjustment plate 6 rotates with the lower arm shaft 8, and the wire rope 5 is gradually separated from the slots. When the bow is lowered, the adjustment plate 6 also rotates with the lower arm shaft 8, and the wire rope 5 is gradually clamped into the slots.

[0076] In a specific embodiment of the present invention, Fig. 9 As shown, the first section steel wire rope model 501, the second section steel wire rope model 502, the third section steel wire rope model 503 and the fourth section steel wire rope model 504 are used to simulate the entire steel wire rope 5, and each section steel wire rope 5 model is simulated by a beam unit beam188 or a rod unit link180. Fig.10 and Fig.11 As shown, the first section of the steel wire rope model 501 and the second section of the steel wire rope model 502 are both led out from the vertical slot of the steel wire rope mounting seat 4, and then enter the slots of the two adjustment plates 6. The first section of the steel wire rope model 501 and the second section of the steel wire rope model 502 should be located at the common tangent position of the vertical arc groove of the steel wire rope mounting seat 4 and the vertical slots of the two adjustment plates 6. Therefore, the construction process of the first section of the steel wire rope model 501 and the second section of the steel wire rope model 502 is:

[0077] Find out the common tangent line between one of the vertical arc grooves of the wire rope mounting seat 4 and the vertical slot of the corresponding adjustment plate 6, and establish a beam unit or a rod unit between the two tangent points of the common tangent line to obtain the first section wire rope model 501; find out the common tangent line between another vertical arc groove of the wire rope mounting seat 4 and the vertical slot of the corresponding adjustment plate 6, and establish a beam unit or a rod unit between the two tangent points of the common tangent line to obtain the second section wire rope model 502. That is, a rigid connection is established between the first end node of the first section wire rope model 501 and the second section wire rope model 502 and the slot of the wire rope mounting seat 4, and a rigid connection is established between the second end node of the first section wire rope model 501 and the second section wire rope model 502 and the vertical slot of the corresponding adjustment plate 6.

[0078] In a specific embodiment of the present invention, Fig.11 As shown, the construction process of the third section steel wire rope model 503 and the fourth section steel wire rope model 504 is as follows:

[0079] A beam unit or a rod unit is established between the slot of one of the adjustment plates 6 and the corresponding fixing hole of the wire rope fixing support 11 on the pantograph lower arm rotating shaft 8 to obtain a third section wire rope model 503; a beam unit or a rod unit is established between the slot of the other adjustment plate 6 and the corresponding fixing hole of the wire rope fixing support 11 on the pantograph lower arm rotating shaft 8 to obtain a fourth section wire rope model 504.

[0080] The airbag 2 mainly includes a bottom plate, an inflatable bladder, a top plate and other components, wherein the bottom plate and the top plate are simulated using a shell unit model, and the inflatable bladder is simulated using a beam unit beam188 or a spring unit combin14. In a specific embodiment of the present invention, the construction process of the airbag 2 model is as follows:

[0081] Step 2.11: Construct the bottom plate shell element model and the top plate shell element model of the airbag 2;

[0082] Step 2.12: Establish two coincident nodes A and B between the center of the bottom plate shell element model and the center of the top plate shell element model;

[0083] Step 2.13: Establish multiple beam elements beam188 between node A and multiple nodes evenly distributed in the bottom plate shell element model; establish multiple beam elements beam188 between node B and multiple nodes evenly distributed in the top plate shell element model;

[0084] Step 2.14: A column articulated unit AB is established between node A and node B, and the rotation axis direction of the column articulated unit AB is consistent with the direction of the rotation axis 8 of the pantograph lower arm.

[0085] After the airbag 2 is inflated, it is restricted by the driving rod 1 which can only rotate. Therefore, the airbag 2 will bend around the rotation axis AB of the column hinge unit while extending. That is to say, while the airbag 2 is extended, an angle of rotation will be generated between the top plate and the bottom plate of the airbag 2 around the rotation axis AB of the column hinge unit. This airbag 2 simulation method allows the bottom plate and the top plate of the airbag 2 to generate an angle of rotation around the rotation axis AB of the column hinge unit, so this airbag 2 simulation method is reasonable.

[0086] In another specific embodiment of the present invention, the construction process of the airbag 2 model is:

[0087] Step 2.21: Construct the bottom plate shell element model and the top plate shell element model of the airbag 2;

[0088] Step 2.22: Establish two non-coincident nodes A and B between the center of the bottom plate shell unit model and the center of the top plate shell unit model in the vertical direction, that is, node A and node B are separated by a certain distance in the vertical direction;

[0089] Step 2.23: Establish multiple beam elements beam188 between node A and multiple nodes evenly distributed in the bottom plate shell element model; establish multiple beam elements beam188 between node B and multiple nodes evenly distributed in the top plate shell element model;

[0090] Step 2.24: Create a spring element combin14 between node A and node B.

[0091] This airbag 2 simulation method cannot reflect the bending characteristics of the airbag 2.

[0092] The present invention adopts shell units, beam units, column hinge units or spring units to simulate the airbag 2, adopts beam units or rod units to simulate the wire rope 5, adopts shell units to simulate the driving rod 1 and the butterfly seat 3, and adopts solid units to simulate the wire rope mounting seat 4, which simplifies the bow lifting device model, reduces the model scale of the bow lifting device, reduces the solution difficulty, and improves the calculation speed.

[0093] Step 3: Establish a connection between the pantograph finite element model and the pantograph lifting device finite element model to obtain a pantograph strength calculation model including the pantograph lifting device.

[0094] like Fig.12 As shown, a bolt connection is established between the bottom plate of the airbag 2 and the airbag mounting seat 12 on the pantograph chassis 9, a column hinge connection is established between the hinged end 101 of the driving rod and the driving rod support 10 on the pantograph chassis 9, and a rigid connection is established between the wire rope 5 and the slot of the adjustment plate 6, and between the wire rope 5 and the wire rope fixing support 11 on the pantograph lower arm rotating shaft 8, and a pantograph strength calculation model including a pantograph lifting device is obtained, as shown in FIG. Fig.13 shown.

[0095] In this embodiment, a rigid connection is established between the wire rope 5 and the slot of the adjustment plate 6, and between the wire rope 5 and the wire rope fixing support 11 on the pantograph lower arm rotating shaft 8, that is, the second end nodes of the first wire rope model 501 and the second wire rope model 502 are respectively rigidly connected to several nodes of the slot of the corresponding adjustment plate 6; the first end nodes of the third wire rope model 503 and the fourth wire rope model 504 are respectively rigidly connected to several nodes of the slot of the corresponding adjustment plate 6; the second end nodes of the third wire rope model 503 and the fourth wire rope model 504 are respectively rigidly connected to several nodes of the wire rope fixing support 11 on the pantograph lower arm rotating shaft 8, such as Fig.10 shown.

[0096] The present invention uses shell units, beam units, column hinge units or spring units to simulate the airbag 2, uses beam units or rod units to simulate the wire rope 5, uses shell units to simulate the drive rod 1 and the butterfly seat 3, and uses solid units to simulate the wire rope mounting seat 4; a column hinge connection relationship is established between the hinged end 101 of the drive rod and the drive rod support 10 welded to the base frame 9, and a rigid connection is established between the wire rope 5 and the wire rope mounting seat 4, between the wire rope 5 and the adjustment plate 6, and between the wire rope 5 and the lower arm rotating shaft 8. This simplified method of simulating the pantograph lifting device can improve the speed of pantograph strength calculation, and at the same time can accurately reflect the actual stress condition of the pantograph lifting device itself, and reflect the actual stress condition of the components connected to the pantograph lifting device (including the drive rod support 10 and welding structure, airbag mounting seat 12, adjustment plate 6 and wire rope fixing support 11 and other components). By extracting the axial force of the beam unit or rod unit of the simulated wire rope 5, the tension value of the wire rope 5 can be accurately calculated, providing a reliable basis for the design of other components of the pantograph and the drive rod 1 and the selection of the wire rope 5.

[0097] Example 2

[0098] A method for calculating pantograph strength provided by an embodiment of the present invention comprises the following steps:

[0099] Step 1: Loading a pantograph strength calculation model including a pantograph raising device obtained by using the pantograph strength calculation modeling method described in Example 1 of the present application;

[0100] Step 2: Apply loads and boundary conditions to the pantograph strength calculation model according to the actual operating conditions of the pantograph;

[0101] Step 3: Simulate the pantograph strength calculation model to obtain the stress distribution cloud map.

[0102] Example 3

[0103] An embodiment of the present invention also provides an electronic device, which includes: a memory, a processor, and a computer program / instructions stored in the memory, and the processor executes the computer program / instructions to implement the pantograph strength calculation modeling method or the pantograph strength calculation method in the embodiment of the present application.

[0104] Although not shown, the electronic device includes a processor, which can perform various appropriate operations and processes according to the program and / or data stored in the read-only memory (ROM) or the program and / or data loaded from the storage portion into the random access memory (RAM). The processor can be a multi-core processor, or it can include multiple processors. In some embodiments, the processor can include a general main processor and one or more special coprocessors, such as a central processing unit, a graphics processing unit (GPU), a neural network processor (NPU), a digital signal processor (DSP), etc. In RAM, various programs and data required for device operation are also stored. The processor, ROM and RAM are connected to each other via a bus. The input / output (I / O) interface is also connected to the bus.

[0105] The processor and the memory are used together to execute the program / instructions stored in the memory. When the program / instructions are executed by the computer, the methods, steps or functions described in the above embodiments can be implemented.

[0106] Although not shown, an embodiment of the present invention further provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the pantograph strength calculation modeling method or the pantograph strength calculation method in the embodiment of the present application.

[0107] Storage media in embodiments of the present invention include permanent and non-permanent, removable and non-removable items that can be implemented by any method or technology to store information. Examples of storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0108] Readable storage media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0109] Although not shown, an embodiment of the present invention further provides a computer program product, including: a computer program / instruction, which, when executed by a processor, implements the pantograph strength calculation modeling method or the pantograph strength calculation method in the embodiment of the present application.

[0110] What is disclosed above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A pantograph strength calculation modeling method, characterized in that: The modeling method comprises: Construct a finite element model of the pantograph; Based on the pantograph finite element model, construct a pantograph lifting device finite element model; Based on the pantograph finite element model and the pantograph lifting device finite element model, a bolt connection is established between the bottom plate of the airbag and the airbag mounting seat on the pantograph chassis, a column hinge connection is established between the hinged end of the drive rod and the drive rod support on the pantograph chassis, and a rigid connection is established between the wire rope and the slot of the adjustment plate and between the wire rope and the wire rope fixing support on the pantograph lower arm rotating shaft, so as to obtain a pantograph strength calculation model including the pantograph lifting device.

2. The pantograph strength calculation modeling method according to claim 1 is characterized in that: When constructing the finite element model of the bow lifting device, a rigid connection is established between the wire rope and the slot of the wire rope mounting seat, a bolt connection is established between the top plate of the airbag and the butterfly seat, a bolt connection is established between the butterfly seat and the driving rod, and a bolt connection is established between the movable end of the driving rod and the wire rope mounting seat.

3. The pantograph strength calculation modeling method according to claim 1, characterized in that: When constructing the finite element model of the bow hoisting device, the first section steel wire rope model, the second section steel wire rope model, the third section steel wire rope model and the fourth section steel wire rope model are used to simulate the steel wire rope; The construction process of the first section wire rope model and the second section wire rope model is as follows: Find the common tangent line between one of the vertical arc grooves of the wire rope mounting seat and the vertical slot of the corresponding adjustment plate, establish a beam unit or a rod unit between the two tangent points of the common tangent line, and obtain the first wire rope model; Find the common tangent line between another vertical arc groove of the wire rope mounting seat and the vertical slot of the corresponding adjustment plate, establish a beam unit or a rod unit between the two tangent points of the common tangent line, and obtain the model of the second wire rope segment; The construction process of the third section steel wire rope model and the fourth section steel wire rope model is as follows: A beam unit or a rod unit is established between the slot of one of the adjustment plates and the corresponding fixing hole of the wire rope fixing support on the rotating shaft of the lower arm of the pantograph to obtain a model of the third wire rope segment; A beam unit or a rod unit is established between the card slot of another adjustment plate and the corresponding fixing hole of the wire rope fixing support on the rotating shaft of the lower arm of the pantograph to obtain the fourth wire rope model.

4. The pantograph strength calculation modeling method according to claim 3 is characterized in that: The first end nodes of the first section wire rope model and the second section wire rope model are respectively rigidly connected to the corresponding wire rope mounting seat slots; the second end nodes of the first section wire rope model and the second section wire rope model are respectively rigidly connected to the corresponding adjustment plate slots; the first end nodes of the third section wire rope model and the fourth section wire rope model are respectively rigidly connected to the corresponding adjustment plate slots; the second end nodes of the third section wire rope model and the fourth section wire rope model are respectively rigidly connected to the wire rope fixing support on the pantograph lower arm rotating shaft.

5. The pantograph strength calculation modeling method according to any one of claims 1 to 4, characterized in that: When constructing the finite element model of the bow lifting device, the construction process of the airbag model is as follows: Construct the bottom plate shell unit model and top plate shell unit model of the airbag; Establish two coincident nodes A and B between the center of the bottom plate shell unit model and the center of the top plate shell unit model; Establish multiple beam units between node A and multiple nodes evenly distributed in the bottom plate shell unit model; establish multiple beam units between node B and multiple nodes evenly distributed in the top plate shell unit model; A column articulation unit AB is established between node A and node B, and the rotation axis direction of the column articulation unit AB is consistent with the rotation axis direction of the pantograph lower arm.

6. The pantograph strength calculation modeling method according to any one of claims 1 to 4, characterized in that: When constructing the finite element model of the bow lifting device, the construction process of the airbag model is as follows: Construct the bottom plate shell unit model and top plate shell unit model of the airbag; Establish two non-overlapping nodes A and B in the vertical direction between the center of the bottom plate shell unit model and the center of the top plate shell unit model; Establish multiple beam units between node A and multiple nodes evenly distributed in the bottom plate shell unit model; establish multiple beam units between node B and multiple nodes evenly distributed in the top plate shell unit model; A spring element is established between node A and node B.

7. A method for calculating pantograph strength, characterized in that: The calculation method includes: Constructing a pantograph strength calculation model including a pantograph raising device using the pantograph strength calculation modeling method according to any one of claims 1 to 6; Applying loads and boundary conditions to the pantograph strength calculation model according to the actual operating conditions of the pantograph; The pantograph strength calculation model is simulated and calculated to obtain a stress distribution cloud diagram.

8. An electronic device comprising a memory, a processor, and a computer program / instruction stored in the memory, characterized in that: The processor executes the computer program / instructions to implement the pantograph strength calculation modeling method according to any one of claims 1 to 6 or the pantograph strength calculation method according to claim 7.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the pantograph strength calculation modeling method according to any one of claims 1 to 6 or the pantograph strength calculation method according to claim 7 is implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the pantograph strength calculation modeling method according to any one of claims 1 to 6 or the pantograph strength calculation method according to claim 7 is implemented.

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