CN112733407A - Simulation calculation method for turnout switch rail repulsion state line shape - Google Patents
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- 238000004364 calculation method Methods 0.000 title claims abstract description 17
- 238000004088 simulation Methods 0.000 title claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 31
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- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
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- 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
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Abstract
The invention provides a linear simulation calculation method for the turnout switch rail repulsion state, which comprises the following steps: s1, establishing a finite element analysis model of the switch blade based on the actual design parameters of the switch blade; s2, obtaining a transverse displacement distribution curve delta y (x) of the point rail in the repulsion-separation state according to a finite element analysis model; s3, obtaining the transverse displacement distribution curve y of the point rail in the close contact state according to the finite element analysis modelm(x) (ii) a S4, obtaining the transverse position coordinate y in the state that the switch rail is repelled away through superposition calculationc(xi) (ii) a S5, based on the position coordinates (x) of each discrete node in the state of the point rail being repelled awayi,yc(xi) Obtaining the linear y of the point rail in the repulsion-separation state through spline curve fittingc(x) (ii) a And S6, calculating subsequent dimensions and designing parts based on the calculated linear shape of the switch rail in the repulsion-separation state. The method obtains the line shape of the switch rail in the repulsion-separation state based on simulation calculationThe obtained line shape is more consistent with the reality, and more accurate basis can be provided for the design of subsequent related parts.
Description
Technical Field
The invention relates to the field of railway track design, in particular to a linear simulation calculation method for a turnout switch rail in a repulsion-separation state.
Background
In the design process of railway switches, the plane line shape of the switches needs to be determined firstly.
In the design of a turnout, the line shape of the turnout point rail in a close contact state is designed accurately, but the line shape of the point rail in a repulsion-separation state is processed in a simpler way.
The currently widely adopted method is as follows: after the design determines the line shape of the point rail in the close contact state, the movable section of the point rail in the close contact state rotates by taking the fixed end of the heel end of the point rail as the center of a circle, the displacement of the point rail at the first traction point position is consistent with the design stroke after the point rail rotates, and the rotated line shape is taken as the line shape of the point rail in the repulsion-separation state. The line shape of the switch rail obtained by the method in the repulsion-separation state is often greatly deviated from the actual situation.
However, the line shape of the point rail in the repelled state is important. For the turnout adopting the internal locking mode, the length of the pull rod and the connecting rod needs to be calculated and determined according to the line shape of the switch rail in the repulsion-separation state, and for the speed-up and high-speed turnout, the position of parts such as the anti-jump clamp iron needs to be determined according to the line shape of the switch rail in the repulsion-separation state. Therefore, it is necessary to determine the line shape of the point rail in the repelled state as accurately as possible in the design process. The simplified processing method adopted at present has the major disadvantages that considerable deviation occurs in the design of related parts, and the subsequent manufacturing, laying and using of the turnout are adversely affected.
Disclosure of Invention
The invention provides a method for simulating and calculating the linear shape of a switch point in a separating state, which aims to solve the problem that the linear shape of the switch point in the separating state obtained by a traditional method in the prior art often has larger deviation with the actual situation.
The invention provides a linear simulation calculation method for the turnout switch rail repulsion state, which comprises the following steps:
s1, establishing a finite element analysis model of the switch blade based on the actual design parameters of the switch blade;
s2, obtaining a transverse displacement distribution curve delta y (x) of the point rail in the repulsion-separation state according to a finite element analysis model;
s3, obtaining the transverse displacement distribution curve y of the point rail in the close contact state according to the finite element analysis modelm(x)；
S4, obtaining the transverse position coordinate y in the state that the switch rail is repelled away through superposition calculationc(xi) The formula is as follows:
yc(xi)＝ym(xi)+Δy(xi) i＝1,2,3,...,n+1；
s5, based on the position coordinates (x) of each discrete node in the state of the point rail being repelled awayi,yc(xi) Obtaining the linear y of the point rail in the repulsion-separation state through spline curve fittingc(x)；
And S6, calculating subsequent dimensions and designing parts based on the calculated linear shape of the switch rail in the repulsion-separation state.
In order to more accurately calculate and determine the linear shape of the switch rail in the state of repulsion and separation and to more accurately determine the length and other parameters of the pull rod and the connecting rod, the method is adopted for simulation calculation. Firstly, a finite element analysis model of the switch blade is established based on the actual design parameters of the switch blade.
As an optimal mode, the actual design parameters in the step S1 specifically include the set material density, the elastic modulus and the Poisson' S ratio.
The invention relates to a linear simulation calculation method of a turnout switch rail repulsion state, which is an optimal mode, and the step S1 specifically comprises the following steps:
s11, simulating the switch rail by adopting an entity unit, and importing actual design parameters;
s12, respectively leading in the characteristic cross section of the switch rail from the switch rail tip to the full cross section of the switch rail;
s13, linear interpolation transition is adopted among all characteristic sections;
and S14, setting the switch rail heel end as fixed constraint, and simulating the fastener system of the switch rail heel end and the friction force borne by the switch rail by adopting the spring unit to establish a finite element analysis model of the switch rail.
The invention relates to a linear simulation calculation method of a turnout switch rail repulsion state, which is an optimal mode, and the step S2 specifically comprises the following steps:
s21, leading in a traction point position based on the actual situation of the switch rail;
s22, setting transverse displacement loads which are the same as the designed stroke at the positions of the traction points respectively;
s23, obtaining a transverse displacement distribution curve delta y (x) of the point rail in the repulsion-separation state according to a finite element analysis model;
s24, equally dividing the switch rail into n segments along the longitudinal direction, discretizing the transverse displacement distribution curve delta y (x) of the repulsion state, wherein the position coordinate of each node is xiThe amount of lateral displacement corresponding to each node is Δ y (x)i)。
The invention relates to a linear simulation calculation method of a turnout switch rail repulsion state, which is an optimal mode, and the step S3 specifically comprises the following steps:
s31, leading in a traction point position based on the actual situation of the switch rail;
s32, setting transverse displacement loads which are the same as the designed stroke at the positions of the traction points respectively;
s33, obtaining the transverse displacement distribution curve y of the switch rail in the close contact state according to the finite element analysis modelm(x)；
S34, equally dividing the switch rail into n sections along the longitudinal direction, and distributing the transverse displacement curve y in the close contact statem(x) Discretizing, wherein the longitudinal position coordinate of each node of the switch rail in a close contact state is xiCorresponding lateral position coordinate ym(xi)。
As an optimal mode, the characteristic cross section comprises a cross section with the width of 0mm, a cross section with the width of 5mm, a cross section with the width of 20mm, a cross section with the width of 50mm and a full cross section.
The invention has the following beneficial effects:
(1) the method calculates the elastic deformation of the switch rail in the repulsion-separation state based on mechanics, and the elastic deformation of the switch rail is not considered in the existing method.
(2) The method adopts a discretization processing mode to obtain the discrete point position of the switch rail in the repulsion-separation state, so as to obtain the line type of the switch rail in the repulsion-separation state, 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 switch 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 repulsion-separation state based on simulation calculation, and the obtained line shape is more consistent with the reality and can provide more accurate basis for the design of subsequent related parts.
Drawings
Fig. 1 is a flow chart of a simulation calculation method for the turnout switch rail repulsion-separation state line shape.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in figure 1, a simulation calculation method for the turnout switch rail repulsion state line shape is used for calculating the turnout switch rail repulsion state line shape of No. 12 No. 60kg/m steel rail, the turnout of No. 12 No. 60kg/m steel rail is a turnout with large use amount in the railway turnout in China, and the total arrangement diagram of the turnout is shown in figure 1. During long-term operation and use, a series of problems occur in the turnout of the type. Therefore, the existing No. 12 turnout of the 60kg/m steel rail is designed to be optimized.
The method comprises the following steps:
s1, simulating the switch rail by adopting a solid unit, and introducing actual design parameters, wherein the material density is 7850kg/m3The elastic modulus is measured to be 2.1 multiplied by 1011Pa, the Poisson ratio is measured to be 0.3, and the length of the switch rail is 14300 mm;
s2, respectively leading in characteristic cross sections of the switch rail from the tip of the switch rail to the full cross section of the switch rail, wherein the characteristic cross sections comprise a cross section with the width of 0mm at the top of the switch rail, a cross section with the width of 5mm, a cross section with the width of 20mm, a cross section with the width of 50mm and the full cross section;
s3, setting the point rail heel end as a fixed constraint, simulating the friction force borne by the point rail heel end fastener system and the point rail by adopting a spring unit, 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;
and S4, setting the transverse displacement load which is the same as the designed stroke at each traction point position. For example, for No. 12 turnouts of a 60kg/m steel rail, 2 traction points are provided, the design stroke of a first traction point is 160mm, and the design stroke of a second traction point is 75 mm;
s5, when the switch rail is in a repulsion-separation state, applying a forced displacement of 160mm at the position of a first traction point and applying a forced displacement of 75mm at the position of a second traction point, and establishing a finite element analysis model of the switch rail;
s6, obtaining a transverse displacement distribution curve delta y (x) of the point rail in the repulsion-separation state according to a finite element analysis model;
s7, dividing the switch rail into 64 segments equally along the longitudinal direction, making 65 nodes totally, discretizing the transverse displacement distribution curve delta y (x) of the repulsion-separation state, and making the position coordinate of each node be xiThe amount of lateral displacement corresponding to each node is Δ y (x)i)；
The amount of lateral displacement at each point is as follows:
s8, leading in a traction point position based on the actual situation of the switch rail;
s9, setting transverse displacement loads which are the same as the designed stroke at the positions of the traction points respectively;
s10, obtaining the transverse displacement distribution curve y of the switch rail in the close contact state according to the finite element analysis modelm(x)；
S11, equally dividing the switch rail into 64 sections along the longitudinal direction, wherein the total number of the nodes is 65, and the transverse displacement distribution curve y is in a close contact statem(x) Discretizing, wherein the longitudinal position coordinate of each node of the switch rail in a close contact state is xiCorresponding lateral position coordinate ym(xi)；
S12, obtaining the transverse position coordinate y in the state that the switch rail is repelled away through superposition calculationc(xi) The formula is as follows:
yc(xi)＝ym(xi)+Δy(xi) i＝1,2,3,...,n+1；
s13, based on the position coordinates (x) of each discrete node in the state of the point rail being repelled awayi,yc(xi) Obtained by spline curve fitting)Linear y of point rail in repulsion-separation statec(x)；
The position coordinates of each discrete point of the switch rail in the state of repulsion and separation are as follows:
and S14, calculating subsequent dimensions and designing parts based on the calculated linear shape of the switch rail in the repulsion-separation state.
The maximum deviation of the line shape of the repulsion-separation switch rail obtained by the method of the invention and the traditional method reaches about 25mm, and the large deviation can influence the accuracy and the rationality of subsequent design.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A linear simulation calculation method of a turnout switch rail repulsion-separation state is characterized in that: the method comprises the following steps:
s1, establishing a finite element analysis model of the switch blade based on the actual design parameters of the switch blade;
s2, obtaining a transverse displacement distribution curve delta y (x) of the point rail in the repulsion-separation state according to the finite element analysis model;
s3, obtaining the transverse displacement distribution curve y of the switch rail in the close contact state according to the finite element analysis modelm(x)；
S4, obtaining the transverse position coordinate y in the state that the switch rail is repelled away through superposition calculationc(xi) The formula is as follows:
yc(xi)＝ym(xi)+Δy(xi) i＝1,2,3,...,n+1；
s5, based on the position coordinates (x) of each discrete node in the state of the point rail being repelled awayi,yc(xi) Obtaining the linear y of the point rail in the repulsion-separation state through spline curve fittingc(x)；
And S6, calculating subsequent dimensions and designing parts based on the calculated linear shape of the switch rail in the repulsion-separation state.
2. The method for simulating and calculating the repulsive linear state of the turnout switch rail according to claim 1, wherein the method comprises the following steps: the actual design parameters in step S1 specifically include setting material density, elastic modulus, and poisson' S ratio.
3. The method for simulating and calculating the repulsive linear state of the turnout switch rail according to claim 1, wherein the method comprises the following steps: the step S1 specifically includes:
s11, simulating the switch rail by adopting an entity unit, and importing the actual design parameters;
s12, respectively leading in the characteristic cross section of the switch rail from the switch rail tip to the full cross section of the switch rail;
s13, linear interpolation transition is adopted among all the characteristic sections;
and S14, setting the switch rail heel end as fixed constraint, and simulating the fastener system of the switch rail heel end and the friction force borne by the switch rail by adopting the spring unit to establish a finite element analysis model of the switch rail.
4. The method for simulating and calculating the repulsive linear state of the turnout switch rail according to claim 1, wherein the method comprises the following steps: the step S2 specifically includes:
s21, leading in a traction point position based on the actual situation of the switch rail;
s22, setting transverse displacement loads which are the same as the designed stroke at the positions of the traction points respectively;
s23, obtaining a transverse displacement distribution curve delta y (x) of the point rail in the repulsion-separation state according to the finite element analysis model;
s24, equally dividing the switch rail into n sections along the longitudinal direction, discretizing the transverse displacement distribution curve delta y (x) of the repulsion-separation state, and setting the position coordinates of each node as xiThe amount of lateral displacement corresponding to each node is Δ y (x)i)。
5. The method for simulating and calculating the repulsive linear state of the turnout switch rail according to claim 1, wherein the method comprises the following steps: the step S3 specifically includes:
s31, leading in a traction point position based on the actual situation of the switch rail;
s32, setting transverse displacement loads which are the same as the designed stroke at the positions of the traction points respectively;
s33, obtaining the transverse displacement distribution curve y of the switch rail in the close contact state according to the finite element analysis modelm(x)；
S34, equally dividing the switch rail into n sections along the longitudinal direction, and enabling the switch rail to be in a close contact state and a transverse displacement distribution curve ym(x) Discretizing, wherein the longitudinal position coordinate of each node of the switch rail in a close contact state is xiCorresponding lateral position coordinate ym(xi)。
6. The method for simulating and calculating the repulsive linear state of the turnout switch rail according to claim 3, wherein the method comprises the following steps: the characteristic sections comprise a section with the width of 0mm, a section with the width of 5mm, a section with the width of 20mm, a section with the width of 50mm and a full section.
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| CN115081098A (en) * | 2022-08-22 | 2022-09-20 | 中南大学 | Modeling method for single turnout of each number of parameterized railway |
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