CN112733407B - Simulation calculation method for switch tongue repulsive state line shape - Google Patents
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- 238000004364 calculation method Methods 0.000 title claims abstract description 23
- 238000004088 simulation Methods 0.000 title claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention provides a simulation calculation method for the shape of a switch tongue in a state of being separated, which comprises the following steps: s1, establishing a finite element analysis model of a switch tongue rail based on actual design parameters of the tongue rail; s2, obtaining a transverse displacement distribution curve delta y (x) of the repulsive state of the switch rail according to the finite element analysis model; s3, obtaining a lateral displacement distribution curve y of the close state of the switch rail according to the finite element analysis model m (x) The method comprises the steps of carrying out a first treatment on the surface of the S4, obtaining a transverse position coordinate y under the state of point rail separation through superposition calculation c (x i ) The method comprises the steps of carrying out a first treatment on the surface of the S5, based on the position coordinates (x) of each discrete node in the point rail repulsive state i ,y c (x i ) Obtaining the linear y of the switch rail in the repulsive state through spline curve fitting c (x) The method comprises the steps of carrying out a first treatment on the surface of the S6, based on the calculated line shape of the point rail in the state of being separated, the subsequent size calculation and the design of parts are carried out. The method is based on simulation calculation to obtain the line shape of the switch rail in the state of being separated, the obtained line shape is more consistent with the actual line shape, and more accurate basis can be provided for the subsequent related part design.
Description
Technical Field
The invention relates to the field of railway track design, in particular to a simulation calculation method for the repulsive state line shape of a switch tongue.
Background
In the design of railway switches, it is first necessary to determine the planar alignment of the switch.
In the design of a switch, the alignment of the switch point in the closed position is usually precisely designed, but the alignment of the point in the open position is often handled in a relatively simple manner.
The methods commonly adopted at present are as follows: after the design determines the line shape of the point rail in the close state, rotating the movable section of the point rail in the close state by taking the fixed end of the heel end of the point rail as the center of a circle until the displacement of the point rail at the first traction point position is consistent with the design movement, wherein the line shape after rotation is taken as the line shape of the point rail in the repulsive state. The line shape of the switch rail obtained by the method in the repulsive state often has larger deviation from the actual situation.
However, the alignment of the point rail in the repelled state is important. For a switch adopting an inner locking mode, the length of a pull rod needs to be calculated and determined according to the line shape of a switch rail in a repulsive state, and for a speed raising and high-speed switch, the position of parts such as a jump-preventing clamp iron needs to be determined according to the line shape of the switch rail in the repulsive state. It is therefore necessary to determine the shape of the point rail in the repelled state as accurately as possible during the design process. The simplified processing method adopted at present has larger defects, which can cause considerable deviation of the design of related parts and cause adverse effects on the subsequent manufacture, laying and use of the turnout.
Disclosure of Invention
The invention provides a simulation calculation method for the shape of a switch tongue in a state of being repelled from, and solves the problem that the shape of the switch tongue in the state of being repelled from often has larger deviation from the actual situation in the prior art.
The invention provides a simulation calculation method for the shape of a switch tongue in a state of being separated, which comprises the following steps:
s1, establishing a finite element analysis model of a switch tongue rail based on actual design parameters of the tongue rail;
s2, obtaining a transverse displacement distribution curve delta y (x) of the repulsive state of the switch rail according to the finite element analysis model;
s3, obtaining a lateral displacement distribution curve y of the close state of the switch rail according to the finite element analysis model m (x)；
S4, obtaining a transverse position coordinate y under the state of point rail separation through superposition calculation c (x i ) The formula is as follows:
y c (x i )＝y m (x i )+Δy(x i ) i＝1,2,3,...,n+1；
s5, based on the position coordinates (x) of each discrete node in the point rail repulsive state i ,y c (x i ) Obtaining the linear y of the switch rail in the repulsive state through spline curve fitting c (x)；
S6, based on the calculated line shape of the point rail in the state of being separated, the subsequent size calculation and the design of parts are carried out.
In order to more accurately calculate and determine the line shape of the switch rail in the state of being separated, so as to more accurately determine parameters such as the length of the pull rod and the connecting rod, the simulation calculation is carried out by adopting the method of the invention. First, a finite element analysis model of the switch point is created based on the actual design parameters of the point.
The invention relates to a simulation calculation method for the shape of a switch tongue in a state of being separated, and in a preferred mode, actual design parameters in step S1 specifically comprise set material density, elastic modulus and Poisson ratio.
The invention relates to a simulation calculation method for the shape of a switch tongue in a state of being separated, which is used as a preferable mode, and the step S1 specifically comprises the following steps:
s11, simulating the switch rail by adopting a physical unit, and importing actual design parameters;
s12, respectively introducing characteristic sections of the switch rail from the tip end of the switch rail to the full section of the switch rail;
s13, adopting linear interpolation transition among the characteristic sections;
s14, setting the heel end of the switch rail as fixed constraint, adopting a spring unit to simulate friction force born by the heel end fastener system of the switch rail and the switch rail, and establishing a finite element analysis model of the switch rail.
The invention relates to a simulation calculation method for the shape of a switch tongue in a state of being separated, which is used as a preferable mode, and the step S2 specifically comprises the following steps:
s21, importing the traction point position based on the actual condition of the switch rail;
s22, respectively setting transverse displacement loads which are the same as the designed strokes at the positions of all traction points;
s23, obtaining a transverse displacement distribution curve delta y (x) of the repulsive state of the switch rail according to the finite element analysis model;
s24, longitudinally dividing the switch rail into n sections, discretizing a repulsive-state transverse displacement distribution curve delta y (x), wherein the position coordinates of each node are x i The lateral displacement amount corresponding to each node is Δy (x i )。
The invention relates to a simulation calculation method for the shape of a switch tongue in a state of being separated, which is used as a preferable mode, and the step S3 specifically comprises the following steps:
s31, importing the traction point position based on the actual condition of the switch rail;
s32, respectively setting transverse displacement loads which are the same as the designed strokes at the positions of the traction points;
s33, obtaining a lateral displacement distribution curve y of the close state of the switch rail according to the finite element analysis model m (x)；
S34, dividing the switch rail into n sections along the longitudinal direction uniformly, and closely attaching the transverse displacement distribution curve y m (x) Discretizing, wherein the longitudinal position coordinate of each node of the switch rail in the close contact state is x i Corresponding transverse position coordinate y m (x i )。
The invention relates to a simulation calculation method for the shape of a switch tongue in a state of being separated, and the characteristic section comprises a tongue top width 0mm section, a 5mm section, a 20mm section, a 50mm section and a full section as an optimal mode.
The invention has the following beneficial effects:
(1) The method is based on mechanics to calculate the elastic deformation of the switch rail in the state of being separated, and the existing method does not consider the elastic deformation of the switch rail.
(2) The method adopts a discretization processing mode to obtain the discrete point position under the state of point rail repulsion, further obtains the line type under the state of point rail repulsion, the obtained line type is smooth, no bending point exists, and the line type obtained by the existing method has the bending point at the heel end of the point rail.
(3) The method fully considers the structure and material characteristics of the switch rail, obtains the line shape of the switch rail in the state of being separated based on simulation calculation, and the obtained line shape is more consistent with the actual line shape, thereby providing more accurate basis for the subsequent related part design.
Drawings
FIG. 1 is a flow chart of a method for simulating and calculating the shape of the switch blade in the state of being repelled.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1
As shown in figure 1, a simulation calculation method of the switch tongue exclusion state line shape calculates the switch tongue exclusion state line shape of a 60kg/m steel rail No. 12, and the 60kg/m steel rail No. 12 is a switch with larger usage amount in the railway switch in China, and the total arrangement diagram of the switch is shown in figure 1. During long-term operation, this type of switch presents a series of problems. Therefore, the existing 60kg/m rail 12 turnout is designed optimally.
The method comprises the following steps:
s1, simulating a switch rail by adopting a solid unit, and introducing actual design parameters, wherein the density of the material is 7850kg/m 3 The elastic modulus is 2.1X1011 Pa, the Poisson ratio is 0.3, and the length of the switch rail is 14300mm;
s2, respectively introducing characteristic sections of the point rail from the point rail tip to the full section of the point rail, wherein the characteristic sections comprise a point rail tip width 0mm section, a point rail tip width 5mm section, a point rail tip width 20mm section, a point rail tip width 50mm section and a point rail full section;
s3, setting the heel end of the point rail as fixed constraint, adopting a spring unit to simulate friction force born by a buckle system of the heel end of the point rail and the point rail, applying uniform load to the friction force, wherein the weight of the point rail is 70kg/m, the friction coefficient is 0.25, and the applied friction force is 175N/m;
s4, respectively setting transverse displacement loads which are the same as the designed strokes at the positions of the traction points. For a number 12 turnout of a 60kg/m steel rail, 2 traction points are provided, wherein the first traction point is 160mm in design movement distance, and the second traction point is 75mm in design movement distance;
s5, in the state of the switch rail being separated, applying 160mm of forced displacement at the position of the first traction point, and applying 75mm of forced displacement at the position of the second traction point, so as to establish a finite element analysis model of the switch rail;
s6, obtaining a transverse displacement distribution curve delta y (x) of the repulsive state of the switch rail according to the finite element analysis model;
s7, dividing the switch rail into 64 sections along the longitudinal direction, namely 65 nodes in total, and distributing the lateral displacement of the repulsive stateDiscretizing curve delta y (x), wherein the position coordinate of each node is x i The lateral displacement amount corresponding to each node is Δy (x i )；
The lateral displacement of each point is shown in the following table:
s8, importing the traction point position based on the actual condition of the switch rail;
s9, respectively setting transverse displacement loads which are the same as the designed strokes at the positions of the traction points;
s10, obtaining a lateral displacement distribution curve y of the close state of the switch rail according to the finite element analysis model m (x)；
S11, dividing the switch rail into 64 sections along the longitudinal direction, namely 65 nodes in total, and closely attaching the transverse displacement distribution curve y m (x) Discretizing, wherein the longitudinal position coordinate of each node of the switch rail in the close contact state is x i Corresponding transverse position coordinate y m (x i )；
S12, obtaining a transverse position coordinate y under the point rail repulsive state through superposition calculation c (x i ) The formula is as follows:
y c (x i )＝y m (x i )+Δy(x i ) i＝1,2,3,...,n+1；
s13, based on the position coordinates (x) of each discrete node in the point rail repulsive state i ,y c (x i ) Obtaining the linear y of the switch rail in the repulsive state through spline curve fitting c (x)；
The discrete point location coordinates of the point repelled state are as follows:
s14, based on the calculated line shape of the point rail in the state of being separated, the subsequent size calculation and the design of parts are carried out.
The maximum deviation of the line shape of the repulsive switch rail obtained by the method and the traditional method reaches about 25mm, and the great deviation is enough to influence the accuracy and rationality of the subsequent design.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. A simulation calculation method for the switch tongue repulsive state line shape is characterized in that: the method comprises the following steps:
s1, establishing a finite element analysis model of a switch tongue rail based on actual design parameters of the tongue rail;
s2, obtaining a transverse displacement distribution curve delta y (x) of the repulsive state of the switch rail according to the finite element analysis model;
s3, obtaining a transverse displacement distribution curve y of the close state of the switch rail according to the finite element analysis model m (x)；
S4, obtaining a transverse position coordinate y under the state of point rail separation through superposition calculation c (x i ) The formula is as follows:
y c (x i )＝y m (x i )+Δy(x i ) i＝1,2,3,...,n+1；
s5, based on the position coordinates (x) of each discrete node in the point rail repulsive state i ,y c (x i ) Obtaining the linear y of the switch rail in the repulsive state through spline curve fitting c (x)；
And S6, calculating the subsequent size and designing parts based on the calculated linear shape of the switch rail in the state of being separated.
2. A method of simulating the alignment of the switch point in the form of a switch point reject phase as claimed in claim 1, wherein: the actual design parameters in the step S1 specifically include setting material density, elastic modulus and poisson' S ratio.
3. A method of simulating the alignment of the switch point in the form of a switch point reject phase as claimed in claim 1, wherein: the step S1 specifically includes:
s11, simulating the switch rail by adopting a physical unit, and importing the actual design parameters;
s12, respectively introducing characteristic sections of the switch rail from the tip end of the switch rail to the full section of the switch rail;
s13, adopting linear interpolation transition between the characteristic sections;
s14, setting the heel end of the switch rail as fixed constraint, adopting a spring unit to simulate friction force born by the heel end fastener system of the switch rail and the switch rail, and establishing a finite element analysis model of the switch rail.
4. A method of simulating the alignment of the switch point in the form of a switch point reject phase as claimed in claim 1, wherein: the step S2 specifically includes:
s21, importing traction point positions based on actual conditions of the switch rails;
s22, respectively setting transverse displacement loads which are the same as the designed strokes at the positions of the traction points;
s23, obtaining a transverse displacement distribution curve delta y (x) of the repulsive state of the switch rail according to the finite element analysis model;
s24, dividing the switch rail into n sections along the longitudinal direction, discretizing the repulsive state transverse displacement distribution curve delta y (x), wherein the position coordinates of each node are x i The lateral displacement corresponding to each node is deltay (x i )。
5. A method of simulating the alignment of the switch point in the form of a switch point reject phase as claimed in claim 1, wherein: the step S3 specifically includes:
s31, importing traction point positions based on actual conditions of the switch rails;
s32, respectively setting transverse displacement loads which are the same as the designed strokes at the positions of the traction points;
s33, obtaining a lateral displacement distribution curve y of the close state of the switch rail according to the finite element analysis model m (x)；
S34, dividing the switch rail into n sections along the longitudinal direction, and enabling the closed state to transversely displace the distribution curve y m (x) Discretizing, wherein the longitudinal position coordinate of each node of the switch rail in the close contact state is x i Corresponding transverse position coordinate y m (x i )。
6. A method of simulating the alignment of the switch point in the form of a switch point reject phase as claimed in claim 3, wherein: the characteristic sections comprise a point rail top width 0mm section, a 5mm section, a 20mm section, a 50mm section and a full section.
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| CN114379613A (en) * | 2022-01-13 | 2022-04-22 | 北京全路通信信号研究设计院集团有限公司 | Method, device, equipment and medium for determining switch rail displacement |
| CN114572278B (en) * | 2022-03-25 | 2024-03-19 | 佳讯飞鸿（北京）智能科技研究院有限公司 | Method and device for monitoring railway turnout working state and readable storage medium |
| CN115081098B (en) * | 2022-08-22 | 2022-11-15 | 中南大学 | Modeling method for single turnout of each number of parameterized railway |
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