CN115099010B - Simulation modeling method for small-structure-height contact net system - Google Patents
Simulation modeling method for small-structure-height contact net system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005094 computer simulation Methods 0.000 title claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 55
- 230000006835 compression Effects 0.000 claims abstract description 52
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 238000012669 compression test Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000002788 crimping Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- G06F30/00—Computer-aided design [CAD]
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
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Abstract
The invention discloses a small-structure-height overhead line system simulation modeling method, which is used for establishing a overhead line system simulation model for small-structure-height overhead line dynamic characteristic simulation based on a short-string compression test result under the condition that the overhead line structure height is reduced. The invention considers the influence of short hanger compression on the current-carrying quality of the bow-net, makes up the defect that the dynamic characteristics of the small-structure-height overhead contact net cannot be reflected because the hanger is only pulled and not pressed in the traditional bow-net model, and is a prerequisite for researching the current-carrying quality of the small-structure-height overhead contact net.
Description
Technical Field
The invention belongs to the technical field of overhead lines and accessories used by the overhead lines, and particularly relates to a simulation modeling method of a small-structure-height overhead line system.
Background
At present, the total mileage of the high-speed railways in China is the first in the stable world, and the high-speed railways become hot options for people to travel. The contact net system mainly comprises a contact line, a carrier rope, a hanger wire, a cantilever support and other additional equipment, wherein the height difference between the contact line and the carrier rope at the cantilever support is called as the structural height. The structure height of the overhead contact system can directly determine the size of the tunnel section, if the overhead contact system with small structure height is adopted, the tunnel section can be reduced, so that the influence of construction on the environment is reduced, and the construction cost is reduced. However, the shortest length requirement of the existing standard on the dropper limits the further compression of the height of the overhead line system, and the modeling method for neglecting the compression behavior of the dropper in the existing simulation model cannot reflect the difference between the dynamic characteristics of the overhead line system with the small structure height and the conventional overhead line system. When the length of the dropper is low, the compression rigidity of the dropper is not negligible, and the double-bow net system is influenced by flow.
Disclosure of Invention
The purpose of the invention is that: the short dropper compression characteristic is researched through experiments, a dropper pulling and pressing nonlinear model is built and incorporated into an arch-net dynamics simulation model, and the method can be used for dynamics simulation of a small-structure height arch net system. Therefore, the invention provides a simulation modeling method for a small-structure-height contact net system.
The invention relates to a small-structure-height overhead line system simulation modeling method, which is used for building a overhead line system simulation model for simulating dynamic characteristics of a small-structure-height overhead line based on test data summary to build a overhead line tension-compression nonlinear model reflecting the compression characteristics of a short overhead line under the condition that the overhead line structure height is reduced, and specifically comprises the following steps:
step 1: and removing the wire nose, the current-carrying ring and the heart-shaped ring part in the dropper, and only reserving the dropper stranded wires and the crimping sleeves at the two ends to manufacture a short dropper test piece of the small-structure-height contact net.
Step 2: the electric servo actuator is selected as a working unit and a displacement collector for a hanger compression test, the spoke type force sensor is used as a load collector, the spherical hinge simulates a connection mode of the hanger and a wire clamp, and a frame is built by 4080 aluminum alloy profiles to form the hanger compression test device.
Step 3: and carrying out a hanger compression test by adopting a constant-speed compression working condition, obtaining the compression rigidity of the hanger and the maximum compression force of the hanger with different lengths, and fitting.
Step 4: the hanger is in a linear state under the condition of stretching, and the key parameter of the hanger is the stretching rigidity. Under the compression condition, when the compression force of the hanger wire does not exceed the maximum compression force, the hanger wire is in a linear compression state, and the compression force is constant after the maximum compression force is reached and the compression is continued. Thus, a tension-compression nonlinear model of the dropper is established:
wherein F is d Representing the force on the hanger, positive when stretched, negative when compressed; k (K) t Is the tensile rigidity of the dropper (the value is 1 multiplied by 10 5 N/m。)，K c The compression rigidity of the hanger is obtained according to a hanger compression test; Δd is the amount of tension of the dropper, when it is greater than zero, representing the dropper in a stretched state, and when it is less than zero, representing the dropper in a compressed state; f (F) m The maximum compressive force of the hanger is related to the initial length of the hanger.
Step 5: establishing a small-structure-height double-bow-net coupling model, simulating a contact line, a carrier cable and a positioner by using an Euler-Bernoulli beam unit, simulating a dropper by using a dropper pulling-pressing nonlinear model established in the step 4, simulating all wire clamps by using a mass unit, simulating a pantograph by using a reduced mass model, and realizing bow-net contact calculation by using a penalty function method.
The beneficial technical effects of the invention are as follows:
according to the invention, the short dropper compression characteristic is researched through a test, a dropper pulling-pressing nonlinear model is built and incorporated into an arch-net dynamics simulation model, and the method can be used for dynamics simulation of a small-structure height arch net system; the invention considers the influence of short hanger compression on the current-carrying quality of the bow-net, makes up the defect that the dynamic characteristics of the small-structure-height overhead contact net cannot be reflected because the hanger is only pulled and not pressed in the traditional bow-net model, and is a prerequisite for researching the current-carrying quality of the small-structure-height overhead contact net.
Drawings
FIG. 1 is a schematic diagram of the length of a short dropper test piece.
FIG. 2 is a schematic diagram of a hanger compression test apparatus.
FIG. 3 is a diagram of a dropper compression test procedure.
FIG. 4 shows the maximum compressive force test results and a fitted curve for a dropper.
FIG. 5 is a schematic diagram of a dropper pull-press nonlinear characteristic.
Fig. 6 is simulation results of a small structure height bow net model at different structure heights.
Fig. 7 shows simulation results of a conventional bow net model at different structural heights.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As a small-structure-height overhead contact system adopting a flexible hanger is not used for a high-speed railway at present, the conventional structure-height overhead contact system parameters with the structure height of 1.6m and the design speed of 350km/h are adopted in the embodiment, and the modeling method provided by the invention is adopted to gradually reduce the structure height for bow net dynamics simulation.
In the existing overhead line system simulation model, only the stretching and relaxation characteristics of the dropper are considered, the compression characteristics of the dropper are not yet researched, when the dropper is short enough, the dropper stranded wires inevitably generate compression resistance and bending resistance, and when a pantograph passes through, the compression force of the dropper can cause elastic mutation of a contact line to influence the current receiving quality of the pantograph net system. Therefore, the compression characteristics of the dropper in the case of short length need to be tested by test means, and short dropper test pieces of different lengths are first manufactured, as shown in fig. 1. To perform the test, a dropper compression test apparatus, as shown in fig. 2, is designed specifically to perform the dropper compression test and accurately record test data. In the hanger compression test, after the test working condition is that the hanger is clamped on a tester, an electric servo actuator drives a linear actuator to uniformly reduce the hanger, and the test process is shown in figure 3. By compression testThe hanger compression characteristics can be obtained as follows: when the hanger is pressed, the compression force and the compression deformation amount show a linear relation, and the ratio is the compression rigidity of the hanger; when the compression force of the dropper is increased to a certain fixed value, the dropper is unstable, and the dropper is continuously compressed after the dropper is unstable, so that the compression force is kept unchanged. To define the compression characteristics of a dropper, two key parameters need to be determined: maximum compressive force and compressive stiffness, wherein the boom compressive stiffness was tested to be 6.3X10 4 The maximum compression force and a fitting curve of the N/m short dropper test pieces with different lengths, which are measured in a compression test, are shown in fig. 4, and the expression of the fitting curve is as follows:
F m ＝-791.95L -1.102
wherein F is m The maximum compressive force for the hanger is given in N. L is the length of the chord in mm.
And (3) summarizing the test result to obtain that the hanger is in a linear state under the tensile condition, wherein the key parameter is tensile rigidity. Under the compression condition, when the compression force of the hanger wire does not exceed the maximum compression force, the hanger wire is in a linear compression state, and the compression force is constant after the maximum compression force is reached and the compression is continued. The tension and compression nonlinear characteristics of the dropper are shown in fig. 5.
The bow net model established by the modeling method and the bow net model established by the traditional method respectively adopt conventional structure height contact net parameters with the structure height of 1.6m and the design speed of 350km/h, the structure height is gradually reduced to perform bow net dynamics simulation, and the shortest hanger length is reduced from 1100mm to 100mm in the period. The simulation results of the double-arch current-carrying quality of the small-structure-height bow net model established by the modeling method provided by the invention under different structure heights are shown in fig. 6, and the simulation results of the model established by the traditional aspect are shown in fig. 7. It can be seen that the bow net model established by the traditional method cannot describe the influence of the reduction of the structure height and the shortening of the hanging chord length on the dynamic current receiving quality of the contact net, and the calculation result of the simulation modeling method provided by the invention can reflect the negative influence of the reduction of the structure height on the dynamic current receiving performance of the bow-net system.
Claims (2)
1. The simulation modeling method of the small-structure-height overhead line system is characterized in that under the condition that the overhead line structure height is reduced, a dropper pulling-pressing nonlinear model reflecting the compression characteristic of a short dropper is built based on test data summary, so that a overhead line system simulation model for simulating dynamic characteristics of the small-structure-height overhead line is built, and the method specifically comprises the following steps:
step 1: removing a wire nose, a current-carrying ring and a heart-shaped ring part in the dropper, and only reserving dropper stranded wires and crimping sleeves at two ends to manufacture a short dropper test piece of the small-structure-height contact net;
step 2: selecting an electric servo actuator as a working unit and a displacement collector for a hanger compression test, using a spoke type force sensor as a load collector, simulating the connection mode of a hanger and a wire clamp by a spherical hinge, and constructing a frame by using 4080 aluminum alloy profiles to form a hanger compression test device;
step 3: carrying out a hanger compression test under a constant-speed compression working condition, obtaining the compression rigidity of the hanger and the maximum compression force of the hanger with different lengths, and fitting;
step 4: the hanger is in a linear state under the condition of stretching, and the key parameter of the hanger is stretching rigidity; under the compression condition, when the compression force of the dropper does not exceed the maximum compression force, the dropper is in a linear compression state, and when the compression force is continued after the maximum compression force is reached, the compression force is constant, so that a tension-compression nonlinear model of the dropper is established:
wherein F is d Representing the force on the hanger, positive when stretched, negative when compressed; k (K) t For the tensile stiffness of the dropper, K c The compression rigidity of the hanger is obtained according to a hanger compression test; Δd is the amount of tension of the dropper, when it is greater than zero, representing the dropper in a stretched state, and when it is less than zero, representing the dropper in a compressed state; f (F) m The maximum compressive force of the hanger is related to the initial length of the hanger;
step 5: establishing a small-structure-height double-bow-net coupling model, simulating a contact line, a carrier cable and a positioner by using an Euler-Bernoulli beam unit, simulating a dropper by using a dropper pulling-pressing nonlinear model established in the step 4, simulating all wire clamps by using a mass unit, simulating a pantograph by using a reduced mass model, and realizing bow-net contact calculation by using a penalty function method.
2. The simulation modeling method for the small-structure-height contact net system according to claim 1, wherein the tensile rigidity K of the hanger is equal to the tensile rigidity K of the hanger t Take the value of 1 multiplied by 10 5 N/m。
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| CN105631128A (en) * | 2015-12-29 | 2016-06-01 | 西南交通大学 | High-speed railway pantograph-net-train-rail vertical coupling large system dynamic modeling and simulation method |
| CN112504704A (en) * | 2020-09-03 | 2021-03-16 | 北京交通大学 | High-speed railway bow net current-collecting technology scaling experiment platform |
| CN112776677A (en) * | 2021-02-02 | 2021-05-11 | 西南交通大学 | Electrified railway contact net suspension structure suitable for big current-carrying capacity |
| CN114169223A (en) * | 2021-11-15 | 2022-03-11 | 西南交通大学 | Optimal design method for distribution coordinates of high-speed contact net dropper |
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| CN105631128A (en) * | 2015-12-29 | 2016-06-01 | 西南交通大学 | High-speed railway pantograph-net-train-rail vertical coupling large system dynamic modeling and simulation method |
| CN112504704A (en) * | 2020-09-03 | 2021-03-16 | 北京交通大学 | High-speed railway bow net current-collecting technology scaling experiment platform |
| CN112776677A (en) * | 2021-02-02 | 2021-05-11 | 西南交通大学 | Electrified railway contact net suspension structure suitable for big current-carrying capacity |
| CN114169223A (en) * | 2021-11-15 | 2022-03-11 | 西南交通大学 | Optimal design method for distribution coordinates of high-speed contact net dropper |
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