CN110795877B - Fluid-solid coupling-based pantograph actuating motor torque compensation amount calculation method - Google Patents
Fluid-solid coupling-based pantograph actuating motor torque compensation amount calculation method Download PDFInfo
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Abstract
The invention discloses a method for calculating the torque compensation of a pantograph actuating motor based on fluid-solid coupling, which adopts finite element analysis software and a fluid-solid coupling solving method to carry out numerical simulation on the air resistance of a pantograph when a train is transferred from an open-line working condition to a tunnel working condition, and the stress state of the air resistance (including the tunnel air additional resistance) is applied to the solid structure stress analysis, so as to calculate the torque compensation amount required by the motor of the pantograph actuating device to counteract the stress, and the torque compensation amount is used as the parameter input of the active control of the pantograph to ensure that the motor of the corresponding actuating device gives certain torque compensation, so as to counteract the influence of the additional resistance of tunnel air on the current receiving state of the pantograph-catenary and provide data support for the active control system of the pantograph, the bow net has small contact action dispersion and low abrasion, so that the train keeps stable dynamic current collection. The method is particularly suitable for calculating the motor torque compensation quantity of the pantograph actuating device under the condition that the high-speed train is converted between the open-line working condition and the tunnel working condition.
Description
Technical Field
The invention relates to the technical field of pantograph current collection quality, in particular to a method for calculating the torque compensation amount of a pantograph actuating motor based on fluid-solid coupling.
Background
With the adoption of the high-speed rail technology and market occupation in China gradually in the world leading position, the relationship between the pantograph and the contact network becomes the problem to be optimized urgently. The high-speed rail motor train units in China are all driven by electric power, and pantograph current collection becomes a key link for ensuring train energy power input. Therefore, the method ensures and improves the current collection quality and becomes one of the key optimization directions in the high-speed railway train technology in China. Therefore, new requirements are put on the pantograph control technology.
In the pantograph current collection quality evaluation, the pantograph-catenary contact force is an important evaluation index. The factor that produces the bow net contact force is more, and wherein three factor is decided by the material and the structure of pantograph and contact net itself, is respectively: the pantograph lifting system comprises a vertical upward static contact force caused by a sliding plate, an up-down alternating dynamic contact force caused by the elastic difference of the material of a contact network and related to the return mass of a pantograph, and a damping force caused by the connection of all parts of the pantograph. Under the condition of continuing to use the existing design scheme, the pantograph-catenary contact force caused by the three factors is kept fixed, only the air resistance and the surface pressure caused by the influence of air flow on the pantograph are changed due to different working conditions in the running process of the train, and the uncertain air flow can cause overlarge or undersize pantograph-catenary contact force and cause larger mechanical abrasion and increase of offline rate.
The stress condition is crucial to realizing active control of the pantograph, and particularly, in the running process of a train, if the train meets the line conditions such as a tunnel and the like, the total sum of the air resistance borne by the pantograph and the air additional resistance of the tunnel is obviously changed, so that the pantograph-catenary contact pressure fluctuation is large. Therefore, how to accurately calculate the motor torque that needs to be compensated for counteracting the influence of the tunnel working condition on the pantograph-catenary contact force by the motor at the end of the pantograph actuating device of the high-speed railway and provide data support for an active control system of the pantograph is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method for calculating a torque compensation amount of a pantograph actuating motor based on fluid-solid coupling, so as to offset an influence of a sudden increase of tunnel air additional resistance on a pantograph-catenary current collection quality.
Therefore, the invention provides a method for calculating the torque compensation of a pantograph actuating motor based on fluid-solid coupling, which comprises the following steps:
s1: establishing a fluid-solid coupling solver by using finite element analysis software ANSYS;
s2: establishing a physical space model, a tunnel model through which a train passes, a train model and a pantograph structure model which are required by calculation;
s3: performing a fluid analysis on the airborne fluid within the physical space model;
s4: carrying out structural analysis on the pantograph structural model;
s5: and calculating the torque compensation quantity of the motor of the pantograph actuating device according to the numerical simulation results of the fluid analysis and the structural analysis.
In a possible implementation manner, in the method for calculating the torque compensation amount of the pantograph actuating motor provided by the present invention, in step S1, a fluid-solid coupling solver is established by using a finite element analysis software ANSYS, which specifically includes the following steps:
s11: in finite element analysis software ANSYS, a Workbench dialog box is opened, and a Fluid Flow module is connected with a Static Structural module to complete the software environment setting of the Fluid-solid coupling solver.
In a possible implementation manner, in the method for calculating a torque compensation amount of a pantograph actuating motor according to the present invention, in step S3, the method for performing fluid analysis on the air fluid in the physical space model specifically includes the following steps:
s31: gridding an integral model consisting of the physical space model, the tunnel model, the train model and the pantograph structure model in a Fluid Flow module, setting integral model grid boundary conditions, setting a train model grid as a moving grid, setting a tunnel model wall surface and a physical space model wall surface as a fixed grid, and loading a UDF (Universal description framework) or Profile file to the speed and the direction of the moving grid;
s32: arranging a Fluid analysis solver in the Fluid Flow module, selecting a turbulence model and a Flow field material, setting the time step length and the iteration times of the dynamic grid, and starting iteration;
s33: and after iteration is completed, storing a fluid analysis solving result, and checking and analyzing the fluid analysis solving result by using result post-processing software to obtain a surface wind pressure distribution map of the pantograph structure.
In a possible implementation manner, in the method for calculating a torque compensation amount of a pantograph actuating motor according to the present invention, the step S4 is to perform a structural analysis on the pantograph structural model, and the method specifically includes the following steps:
s41: loading the pantograph structure model into a Static Structural module;
s42: generating a grid on the surface of the pantograph structure model, and adding a stress constraint condition to the pantograph structure model; wherein the stress constraint condition is a boundary condition required by the structural analysis;
s43: selecting a corresponding constraint mode according to the real structure of the pantograph and the pantograph-vehicle body connection mode, and simulating the stress mode of the pantograph structure;
s44: selecting 'input load' in a Static Structural module, and applying the obtained pantograph structure surface wind pressure distribution map to the surface of the pantograph structure in the Static Structural module;
s45: the purpose of solving is to Solve the equivalent stress and deformation of the pantograph structure, a 'Solve' button is selected to carry out solving calculation, and the stress value and the equivalent stress distribution map of the pantograph structure are obtained.
In a possible implementation manner, in the method for calculating a torque compensation amount of a pantograph actuating motor according to the present invention, step S5 is performed to calculate a torque compensation amount of a pantograph actuating device motor according to a numerical simulation result of the fluid analysis and the structural analysis, and specifically includes the following steps:
s51: selecting a pantograph actuating device according to the stress value and the equivalent stress distribution diagram of the pantograph structure obtained through calculation, and outputting the stress value of the pantograph actuating device;
s52: and calculating the torque compensation quantity required by the motor of the pantograph actuating device for counteracting the influence of the air resistance change on the current collection quality according to the stress value of the pantograph actuating device and the connection mode and the connection structure of the pantograph actuating device and the motor.
The method for calculating the torque compensation amount of the pantograph actuating motor provided by the invention adopts finite element analysis software and adopts a Fluid-solid coupling (namely, Fluid Flow and Static Structural combination) solving method to carry out numerical simulation on the air resistance of the pantograph when a high-speed train is converted from an open-line working condition to a tunnel working condition, and the stress state of the air resistance (including the tunnel air additional resistance) is applied to the solid structure stress analysis, so as to calculate the torque compensation amount required by the motor of the pantograph actuating device to counteract the stress, and the torque compensation amount is used as the parameter input of the active control of the pantograph to ensure that the motor of the corresponding actuating device gives certain torque compensation, so as to counteract the influence of the additional resistance of tunnel air on the current receiving state of the pantograph-catenary and provide data support for the active control system of the pantograph, the bow net has small contact action dispersion and low abrasion, so that the train keeps stable dynamic current collection. The method is provided aiming at the problems that the pantograph is influenced by additional tunnel air additional resistance when the whole structure system is switched from the open-line working condition to the tunnel working condition, and extra torque compensation needs to be provided by the pantograph control system, and is particularly suitable for calculating the motor torque compensation quantity of the pantograph actuating device under the condition that the open-line working condition and the tunnel working condition of the high-speed train are switched.
Drawings
Fig. 1 is a flowchart of a method for calculating a torque compensation amount of a pantograph actuating motor based on fluid-solid coupling according to the present invention;
fig. 2 is a second flowchart of a method for calculating a torque compensation amount of a pantograph actuating motor based on fluid-solid coupling according to the present invention;
FIG. 3 is a side view of a train model and a pantograph structural model constructed, for example, from a high-speed rail train CRH 380A;
FIG. 4 is a front view of a train model and a pantograph configuration model constructed as an example of a high-speed rail train CRH 380A;
fig. 5 is a schematic diagram of a tunnel model and a physical space model constructed by taking a high-speed train CRH380A as an example;
fig. 6 is a third flowchart of a method for calculating a torque compensation amount of a pantograph actuating motor based on fluid-solid coupling according to the present invention;
FIG. 7 is a gridding effect diagram of a train model and a pantograph structure model;
FIG. 8 is a diagram of the gridding effect of the train model, the tunnel model and the physical space model;
FIG. 9 is a schematic diagram of a dynamic mesh switching plane;
fig. 10 is a fourth flowchart of a method for calculating a torque compensation amount of a pantograph actuating motor based on fluid-solid coupling according to the present invention;
fig. 11 is a fifth flowchart of a method for calculating a torque compensation amount of a pantograph actuating motor based on fluid-solid coupling according to the present invention;
fig. 12 is a schematic flow chart corresponding to fig. 11.
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 illustrative and are not intended to limit the present invention.
The invention provides a method for calculating the torque compensation of a pantograph actuating motor based on fluid-solid coupling, which comprises the following steps as shown in figure 1:
s1: establishing a fluid-solid coupling solver by using finite element analysis software ANSYS;
s2: establishing a physical space model, a tunnel model through which a train passes, a train model and a pantograph structure model which are required by calculation;
s3: performing fluid analysis on the air fluid in the physical space model;
s4: carrying out structural analysis on the pantograph structure model;
s5: and calculating the torque compensation quantity of the motor of the pantograph actuating device according to the numerical simulation results of the fluid analysis and the structural analysis.
The method for calculating the torque compensation quantity of the actuating motor of the pantograph provided by the invention adopts finite element analysis software ANSYS and uses a Fluid-solid coupling (namely, Fluid Flow and Static Structural combination) solving method to carry out numerical simulation on the air resistance of the pantograph when a high-speed train is converted from an open-line working condition to a tunnel working condition, and the stress state of the air resistance (including the tunnel air additional resistance) is applied to the solid structure stress analysis, so as to calculate the torque compensation amount required by the motor of the pantograph actuating device to counteract the stress, and the torque compensation amount is used as the parameter input of the active control of the pantograph to ensure that the motor of the corresponding actuating device gives certain torque compensation, so as to counteract the influence of the additional resistance of tunnel air on the current receiving state of the pantograph-catenary and provide data support for the active control system of the pantograph, the bow net has small contact action dispersion and low abrasion, so that the train keeps stable dynamic current collection. The method is provided aiming at the problems that the pantograph is influenced by additional tunnel air additional resistance when the whole structure system is switched from the open-line working condition to the tunnel working condition, and extra torque compensation needs to be provided by the pantograph control system, and is particularly suitable for calculating the motor torque compensation quantity of the pantograph actuating device under the condition that the open-line working condition and the tunnel working condition of the high-speed train are switched.
In a specific implementation, when the finite element analysis software ANSYS is used to establish the fluid-solid coupling solver in the step S1 of the method for calculating the torque compensation amount of the pantograph actuating motor according to the present invention, as shown in fig. 2, the method may specifically include the following steps:
s11: in finite element analysis software ANSYS, a Workbench dialog box is opened, and a Fluid Flow module is connected with a Static Structural module to complete the software environment setting of the Fluid-solid coupling solver.
In a specific implementation, when the physical space model, the tunnel model through which the train runs, the train model, and the pantograph structure model required for calculation are established in step S2 of the method for calculating the torque compensation amount of the pantograph actuating motor according to the present invention, the method specifically includes the following steps: the physical space model size needs to be greater than train size and tunnel size far away, can set up the length of physical space model into 10 times of train automobile body length, sets up the width of physical space model into 20 times of train automobile body width, sets up the height of physical space model into 20 times of train model height, like this, can prevent to cause the piston effect because of the physical space size limitation and influence to carry out accurate analysis to the tunnel air additional resistance that the train got into the tunnel process and produce. The size of the tunnel through which the train passes is built according to the actual size of the project, the actual blocking ratio of the project is met, and the blocking ratio can be 0.13. The train model is constructed by taking the current common high-speed train CRH380A in China as an example, the whole train has 8 carriages (6M2T), the length of the head train and the tail train is 26.5 meters, the length of the middle train is 25 meters, the width of the train is 3.38 meters, and the height of the train is 3.9 meters. The pantograph structure model takes DSA380 as an example, and is constructed according to the distribution and the structure of real parts of a real object. The constructed train model 1 and the pantograph structure model 2 are shown in fig. 3 (side view) and fig. 4 (front view), and the constructed tunnel model 3 and the physical space model 4 are shown in fig. 5. All the geometric models are accurately drawn according to the sizes of related objects, and then geometric Boolean operation is carried out.
In a specific implementation, when the fluid analysis is performed on the air fluid in the physical space model by performing step S3 in the method for calculating the torque compensation amount of the pantograph actuating motor according to the present invention, as shown in fig. 6, the method may specifically include the following steps:
s31: gridding an integral model consisting of a physical space model, a tunnel model, a train model and a pantograph structure model in a Fluid Flow module, setting integral model grid boundary conditions, setting the train model grid as a moving grid, setting the wall surface of the tunnel model and the wall surface of the physical space model as a fixed grid, and loading a UDF (universal description framework) or Profile file on the speed and direction of the moving grid; the gridding effect of the train model 1 and the pantograph structure model 2 is shown in fig. 7, and the gridding effect of the train model 1, the tunnel model 3 and the physical space model 4 is shown in fig. 8;
specifically, the integral model is gridded in the Fluid Flow module, and the gridding can be performed by using a tetrahedral grid and encrypting at the key position of the grid. Because relative motion exists between the train model and the tunnel model in the operation process of the integral model, the boundary condition of the integral model grid can be set, the train grid is set as a moving grid, and UDF or Profile files are loaded on the speed and the direction of the moving grid. As shown in fig. 9, a schematic diagram of a dynamic mesh exchange surface principle is that a train model 1 enters from an entrance 5 of a tunnel model, first enters a first area 6, and exchanges information with a second area 8 through an exchange surface 7, and in the process, a wall surface 9 of the tunnel model keeps relatively stable. Because the inlet and the outlet of the fluid are not involved in the operation process of the integral model, the pressure inlet and the pressure outlet can be set, and the pressure is zero. Another part of the grids, such as the tunnel wall and the computation space wall, can be set as fixed grids because there is no grid motion;
s32: arranging a Fluid analysis solver in the Fluid Flow module, selecting a turbulence model and a Flow field material, setting the time step length and the iteration times of the dynamic grid, and starting iteration;
specifically, after the grid is set, a Fluid analysis solver may be set in the Fluid Flow module, a suitable turbulence model, such as k-epsilon, is selected, and a Flow field material is selected. Because the invention relates to the moving grid, the corresponding time step and the iteration times can be set to simulate the process of the whole train entering and exiting the tunnel, for example, the whole movement can last for 5 seconds, the time step can be set to be 0.001, and the total number of iterations is 5000;
s33: and after iteration is completed, storing the fluid analysis solving result, and checking and analyzing the fluid analysis solving result by using result post-processing software to obtain the surface wind pressure distribution map of the pantograph structure. In particular, the result POST-processing software may be CFD-POST.
In a specific implementation, when performing the step S4 in the method for calculating the torque compensation amount of the pantograph actuating motor according to the present invention to perform the structural analysis on the pantograph structure model, as shown in fig. 10, the method may specifically include the following steps:
s41: loading a pantograph structure model into a Static Structural module;
specifically, only a pantograph structure model is reserved, and a physical space model, a tunnel model and a train model are removed;
s42: generating a grid on the surface of the pantograph structure model, and adding a stress constraint condition on the pantograph structure model; wherein, the stress constraint condition is a boundary condition required by structural analysis;
s43: selecting a corresponding constraint mode according to the real structure of the pantograph and the pantograph-vehicle body connection mode, and simulating the stress mode of the pantograph structure;
s44: selecting 'input load' in a Static Structural module, and applying the obtained pantograph structure surface wind pressure distribution map to the surface of the pantograph structure in the Static Structural module;
s45: the purpose of solving is to Solve the equivalent stress and deformation of the pantograph structure, a 'Solve' button is selected to carry out solving calculation, and the stress value and the equivalent stress distribution map of the pantograph structure are obtained. Specifically, after the solution calculation is completed, the stress value and the equivalent stress distribution diagram of the pantograph structure can be checked in a Static Structural software interface.
In a specific implementation, when the step S5 of the method for calculating the torque compensation amount of the pantograph actuating motor according to the present invention is executed, and the method for calculating the torque compensation amount of the pantograph actuating device motor is calculated according to the numerical simulation result of the fluid analysis and the structural analysis, as shown in fig. 11 (flowchart) and fig. 12 (flowchart), the method may specifically include the following steps:
s51: selecting a pantograph actuating device according to the stress value and the equivalent stress distribution diagram of the pantograph structure obtained by calculation, and outputting the stress value of the pantograph actuating device;
s52: calculating the torque compensation quantity required by the motor of the pantograph actuating device for counteracting the influence of the air resistance change on the current collection quality according to the stress value of the pantograph actuating device and the connection mode and the connection structure of the pantograph actuating device and the motor; therefore, additional tunnel air additional resistance brought to the pantograph by sudden tunnel working conditions can be offset, so that contact force between pantograph nets is kept, and the current collection quality of the pantograph is improved.
The method for calculating the torque compensation quantity of the actuating motor of the pantograph provided by the invention adopts finite element analysis software ANSYS and uses a Fluid-solid coupling (namely, Fluid Flow and Static Structural combination) solving method to carry out numerical simulation on the air resistance of the pantograph when a high-speed train is converted from an open-line working condition to a tunnel working condition, and the stress state of the air resistance (including the tunnel air additional resistance) is applied to the solid structure stress analysis, so as to calculate the torque compensation amount required by the motor of the pantograph actuating device to counteract the stress, and the torque compensation amount is used as the parameter input of the active control of the pantograph to ensure that the motor of the corresponding actuating device gives certain torque compensation, so as to counteract the influence of the additional resistance of tunnel air on the current receiving state of the pantograph-catenary and provide data support for the active control system of the pantograph, the bow net has small contact action dispersion and low abrasion, so that the train keeps stable dynamic current collection. The method is provided aiming at the problems that the pantograph is influenced by additional tunnel air additional resistance when the whole structure system is switched from the open-line working condition to the tunnel working condition, and extra torque compensation needs to be provided by the pantograph control system, and is particularly suitable for calculating the motor torque compensation quantity of the pantograph actuating device under the condition that the open-line working condition and the tunnel working condition of the high-speed train are switched.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A method for calculating the torque compensation of a pantograph actuating motor based on fluid-solid coupling is characterized by comprising the following steps:
s1: establishing a fluid-solid coupling solver by using finite element analysis software ANSYS;
s2: establishing a physical space model, a tunnel model through which a train passes, a train model and a pantograph structure model which are required by calculation;
s3: performing a fluid analysis on the airborne fluid within the physical space model;
s4: carrying out structural analysis on the pantograph structural model;
s5: calculating the torque compensation quantity of the motor of the pantograph actuating device according to the numerical simulation results of the fluid analysis and the structural analysis;
step S4 specifically includes the following steps:
s41: loading the pantograph structure model into a Static Structural module;
s42: generating a grid on the surface of the pantograph structure model, and adding a stress constraint condition to the pantograph structure model; wherein the stress constraint condition is a boundary condition required by the structural analysis;
s43: selecting a corresponding constraint mode according to the real structure of the pantograph and the pantograph-vehicle body connection mode, and simulating the stress mode of the pantograph structure;
s44: selecting 'input load' in a Static Structural module, and applying the obtained pantograph structure surface wind pressure distribution map to the surface of the pantograph structure in the Static Structural module;
s45: the purpose of solving is to Solve the equivalent stress and the deformation of the pantograph structure, a 'Solve' button is selected for solving and calculating to obtain a stress value and an equivalent stress distribution diagram of the pantograph structure;
step S5, specifically including the following steps:
s51: selecting a pantograph actuating device according to the stress value and the equivalent stress distribution diagram of the pantograph structure obtained through calculation, and outputting the stress value of the pantograph actuating device;
s52: and calculating the torque compensation quantity required by the motor of the pantograph actuating device for counteracting the influence of the air resistance change on the current collection quality according to the stress value of the pantograph actuating device and the connection mode and the connection structure of the pantograph actuating device and the motor.
2. The method for calculating the torque compensation amount of the pantograph actuating motor according to claim 1, wherein in step S1, a fluid-solid coupling solver is established by using a finite element analysis software ANSYS, which comprises the following steps:
s11: in finite element analysis software ANSYS, a Workbench dialog box is opened, and a Fluid Flow module is connected with a Static Structural module to complete the software environment setting of the Fluid-solid coupling solver.
3. The method for calculating torque compensation of a pantograph actuator according to claim 2, wherein in step S3, the fluid analysis of the air fluid in the physical space model includes the following steps:
s31: gridding an integral model consisting of the physical space model, the tunnel model, the train model and the pantograph structure model in a Fluid Flow module, setting integral model grid boundary conditions, setting a train model grid as a moving grid, setting a tunnel model wall surface and a physical space model wall surface as a fixed grid, and loading a UDF (Universal description framework) or Profile file to the speed and the direction of the moving grid;
s32: arranging a Fluid analysis solver in the Fluid Flow module, selecting a turbulence model and a Flow field material, setting the time step length and the iteration times of the dynamic grid, and starting iteration;
s33: and after iteration is completed, storing a fluid analysis solving result, and checking and analyzing the fluid analysis solving result by using result post-processing software to obtain a surface wind pressure distribution map of the pantograph structure.
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