Multi-stage simulation method and system for tamping operation space

Abstract

This invention provides a multi-stage simulation method and system for tamping operations, belonging to the technical field of railway ballast track maintenance and management. In the tamping stage, the tamping device vibrates continuously in the longitudinal direction, vertically inserting itself to a designated depth at a certain speed. In the clamping stage, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the pick has not yet rotated longitudinally, and its vertical position remains unchanged. In the withdrawal stage, a longitudinal rotation occurs in the opposite direction to that in the clamping stage in the early stage. This invention effectively considers the ballast bed mechanical state at the operation location, achieving a realistic simulation of the nonlinear motion behavior of the tamping device during the operation. Considering the differences in tamping operations for ballast beds with different mechanical states, an expression for the motion behavior in the clamping stage is derived. Key parameters are obtained through response surface analysis of measured data, combined with the tamping, withdrawal, and continuous vibration movements during the tamping operation.

Description

Technical Field

[0001] This invention relates to the field of railway ballast track maintenance and management technology, specifically to a multi-stage simulation method and system for tamping operation space. Background Technology

[0002] Large-scale track maintenance machinery primarily uses tamping and clamping operations to compress ballast towards the sleeper base, thereby improving sleeper base density and track bed elasticity. Currently, most tamping machines of different types both domestically and internationally employ an "asynchronous clamping" method. This method presets a maximum clamping hydraulic pressure before tamping. As the clamping operation progresses, the ballast resistance experienced by the tamping pick increases, and the hydraulic pressure in the clamping cylinder also increases. The operation stops when the maximum clamping hydraulic pressure is reached. For track beds with different mechanical states, the interaction between the tamping pick and ballast during the clamping process varies significantly, resulting in substantial changes in the tamping pick's clamping stroke. However, current numerical simulation studies of tamping operations by scholars both domestically and internationally simplify the tamping and clamping operation to a linear rotation, failing to consider the nonlinear rotational behavior caused by ballast resistance. Furthermore, the maximum clamping stroke is set to a constant value, neglecting the variation in clamping stroke due to differences in track bed mechanical states.

[0003] Tamping with large-scale track maintenance machinery is a necessary means of maintaining and repairing ballasted tracks. It can effectively improve the geometry of the track. However, tamping operations can easily cause ballast particle breakage, reduce the mechanical properties of the ballasted track bed, and shorten the service life of the ballasted track. Therefore, it is crucial to conduct large-scale maintenance operations scientifically and rationally. Thus, it is essential to systematically study tamping operations using numerical simulation. However, tamping operations involve complex mechanical movements such as translation, rotation, and vibration. The mechanical mechanism of tamping operations on the ballasted track bed is highly complex. Furthermore, the motion behavior of tamping operations changes significantly for ballasted track beds with different mechanical states. Therefore, how to realistically simulate the complex motion behavior of tamping operations is a key technical problem currently facing us.

[0004] Existing tamping operation simulation methods have the following two drawbacks:

[0005] (1) Existing tamping operation simulation methods do not consider the mechanical state of the track bed at the operation location and set the clamping stroke of the tamping operation to a fixed value. However, in the actual tamping and maintenance operation, the mechanical action of the tamping machine on track beds with different mechanical states will vary significantly. Field measurement data shows that the variation of the clamping stroke for track beds with different mechanical states can be as high as 2 times or more. Therefore, existing tamping operation simulation methods are difficult to truly reflect the differences in clamping stroke for track beds with different mechanical states.

[0006] (2) Existing tamping operation simulation methods simulate the tamping clamping behavior as a simple linear rotation, while field measurement data shows that the tamping device undergoes significant nonlinear rotation during the clamping stage of the tamping operation. Therefore, existing tamping operation simulation methods cannot accurately reproduce the clamping trajectory of the tamping operation. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-stage simulation method and system for tamping operations, so as to solve at least one of the technical problems existing in the background art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] On the one hand, the present invention provides a multi-stage simulation method for tamping operation space, including:

[0010] During the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically at a certain speed to the designated depth.

[0011] During the clamping phase, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not yet rotated longitudinally, and the vertical position of the tamping pick remains unchanged.

[0012] During the withdrawal phase, a longitudinal rotation occurs in the early stage that is opposite to that during the clamping phase.

[0013] Furthermore, the tamping pick of the tamping device is fixed to the lower end of the tamping arm. Considering the two together as a rod structure, the force under the clamping stage of the tamping operation, without considering the vibration of the tamping device, is expressed as follows: The rod rotates around the pivot pin connecting the fixed support under the action of clamping hydraulic pressure and ballast resistance.

[0014]

[0015] In the formula, J is the moment of inertia of the rod, t is the tamping operation time, the rotation angle is θ, the arc length is x, the resultant force of the ballast particles acting on the tamping pick during the operation is F1, the distance from this force to the pin connecting the fixed support is l1; the clamping hydraulic pressure applied to the rod during the operation is F2, the distance from this force to the pin connecting the fixed support is l2;

[0016] F1 = M + β·K·x;

[0017] In the formula, M is the initial resistance of the ballast acting on the tamping pick, K is the track bed support stiffness, and β is a constant coefficient.

[0018]

[0019] In the formula, N is the initial clamping fluid pressure. This is a constant coefficient, and its value is related to parameters such as the diameter of the clamping cylinder and the flow rate of the relief valve.

[0020] x = l3·θ.

[0021] Furthermore, then:

[0022]

[0023]

[0024] make but:

[0025]

[0026] Therefore, without considering the vibration of the tamping device, the clamping stroke of the tamping pick during the clamping stage is:

[0027] x=D1·e Pt +D2·e -Pt +D3

[0028] In the formula, D1, D2, and D3 are all constants, and P is related to the track bed support stiffness.

[0029] Furthermore, parameter P is related to the track bed support stiffness, and after transformation, the following formula is obtained:

[0030]

[0031] make but:

[0032]

[0033] The parameter P shows a negative correlation with the track bed support stiffness K, with a correlation coefficient of 0.968 for the fitted curve.

[0034] Furthermore, substituting the calculated unknown parameters D1, D2, D3 and parameter P into the general solution of the clamping stroke, we obtain the final expression for the clamping stroke under the condition of neglecting the vibration of the tamping device:

[0035]

[0036] Furthermore, without considering the vibration of the tamping device, the expression for the clamping stroke in the early stage of the tamping operation withdrawal phase is:

[0037] x = x1 - 170.35 t;

[0038] In the formula, x1 is the maximum clamping stroke.

[0039] Secondly, the present invention provides a multi-stage simulation system for tamping operation space, including a control module, which is configured to: in the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically to a specified depth at a certain speed; in the clamping stage, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation; before the tamping pick overcomes the initial force of the ballast, the tamping pick has not rotated in the longitudinal direction, and the vertical position of the tamping pick remains unchanged; in the withdrawal stage, a rotation occurs in the longitudinal direction in the early stage that is opposite to that in the clamping stage.

[0040] Thirdly, the present invention provides a non-transitory computer-readable storage medium for storing computer instructions, which, when executed by a processor, implement the multi-stage simulation method for tamping work space as described above.

[0041] Fourthly, the present invention provides a computer device including a memory and a processor, wherein the processor and the memory communicate with each other, the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the multi-stage simulation method for tamping work space as described above.

[0042] Fifthly, the present invention provides an electronic device, comprising: a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to cause the electronic device to execute instructions for implementing the multi-stage simulation method for tamping work space as described above.

[0043] The beneficial effects of this invention are: it can effectively consider the mechanical state of the track bed at the working position, and it is the first to realize the real simulation of the nonlinear motion behavior of the tamping device during the operation; considering the differences in tamping operations for track beds with different mechanical states, it derives the basic expression of the motion behavior in the clamping stage through theoretical assumptions and derivations, obtains the key parameters through response surface analysis of measured data, and finally combines the tamping operation's tamping, withdrawal motion and continuous vibration.

[0044] The advantages of additional aspects of the invention will be set forth more clearly in the following description or will be learned by practice of the invention. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the force applied to the clamping and tamping device in the clamping stage according to an embodiment of the present invention.

[0047] Figure 2 This is a schematic diagram of the clamping stroke fitting during the clamping stage according to an embodiment of the present invention. Figure 2 (a) is measurement point one; Figure 2 (b) is measurement point two; Figure 2 (c) is measurement point three; Figure 2 (d) is measurement point four; Figure 2 (e) is measurement point five; Figure 2 (f) is measurement point six.

[0048] Figure 3 This is a schematic diagram of the comprehensive goodness-of-fit calculation results according to an embodiment of the present invention.

[0049] Figure 4 This is the comprehensive goodness-of-fit response surface plot described in an embodiment of the present invention. Figure 4 (a) represents the interaction between D1 and D2. Figure 4 (b) is the interaction between D1 and D3.

[0050] Figure 5 This is a contour plot showing the comprehensive goodness of fit as described in an embodiment of the present invention. Figure 5 (a) represents the interaction between D1 and D2. Figure 5 (b) is the interaction between D1 and D3.

[0051] Figure 6 This is a schematic diagram of the PK fitting curve according to an embodiment of the present invention.

[0052] Figure 7 This is a schematic diagram of the clamping stroke fitting during the early stage of the withdrawal phase as described in an embodiment of the present invention. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0055] It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as here.

[0056] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or groups thereof.

[0057] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0058] To facilitate understanding of the present invention, the present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0059] Those skilled in the art should understand that the accompanying drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily essential for implementing the present invention.

[0060] Example 1

[0061] In this embodiment 1, a multi-stage simulation system for tamping operation space is first provided, including a control module. The control module is configured as follows: In the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically to a specified depth at a certain speed; In the clamping stage, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not rotated in the longitudinal direction, and the vertical position of the tamping pick remains unchanged; In the withdrawal stage, a rotation occurs in the longitudinal direction in the opposite direction to that in the clamping stage in the early stage.

[0062] In this embodiment, the above-described system is used to realize a multi-stage simulation method for tamping operation space, including: in the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically to a specified depth at a certain speed; in the clamping stage, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not rotated in the longitudinal direction, and the vertical position of the tamping pick remains unchanged; in the withdrawal stage, in the early stage, the longitudinal direction rotates in the opposite direction to that of the clamping stage.

[0063] In this embodiment, the mechanical relationship reasoning during the clamping stage includes the following:

[0064] The tamping pick of the tamping device is fixed to the lower end of the tamping arm. Considering both together as a rod structure, the forces experienced during the clamping phase of the tamping operation are as follows: Figure 1 As shown in the figure, O represents the pin connecting the fixed support, which is the fixed hinge support of the rod structure; A is the pick, and the resultant force of the ballast particles acting on the pick during operation is F1, and the distance from this force to point O is l1; B represents the pin connecting the clamping cylinder, and the clamping hydraulic pressure applied to the rod during operation is F2, and the distance from this force to point O is l2. Without considering the vibration of the tamping device, the rod rotates around point O under the action of the clamping hydraulic pressure and the resistance of the ballast, with a rotation angle of θ and an arc length of x, expressed as follows:

[0065]

[0066] In the formula, J is the moment of inertia of the rod, and t is the tamping time.

[0067] At the initial moment of entering the clamping stage of the tamping operation, the tamping pick experiences initial resistance from the ballast particles. During the clamping process, the ballast resistance experienced by the tamping pick increases approximately linearly with the increase of the clamping stroke, and its growth rate is directly proportional to the ballast bed support stiffness. Therefore, the expression for the resistance of the ballast particles acting on the tamping pick during the clamping stage of the tamping operation is:

[0068] F1=M+β·K·x (2)

[0069] In the formula, M is the initial resistance of the ballast acting on the tamping pick, K is the track bed support stiffness, and β is a constant coefficient.

[0070] At the initial moment of the clamping phase, the clamping cylinder applies a certain initial force to the tamping arm. During the clamping operation, the cylinder stroke increases linearly with the increase of the clamping stroke. The corresponding expression for the clamping hydraulic pressure is as follows:

[0071]

[0072] In the formula, N is the initial clamping fluid pressure. This is a constant coefficient, and its value is related to parameters such as the diameter of the clamping cylinder and the flow rate of the relief valve.

[0073] During the tamping clamping operation, the relationship between the clamping stroke and the rotation angle is as follows:

[0074] x=l3·θ (4)

[0075] Substituting expressions (2), (3), and (4) into expression (1), we get:

[0076]

[0077] The above equation can be transformed to obtain:

[0078] make Equation (6) can be simplified to:

[0079]

[0080] It is easy to see that equation (7) is a non-homogeneous linear differential equation with constant coefficients, and its general solution is:

[0081] x=D1·e Pt +D2·e -Pt +D3 (8)

[0082] In the formula, D1, D2, and D3 are all constants.

[0083] Without considering the vibration of the tamping device, Equation (8) is the general expression for the clamping stroke of the tamping pick during the clamping stage, where P is related to the track bed support stiffness and D1 to D3 are unknown parameters.

[0084] The fitting function for the tamping clamping stroke was derived by writing a code in C language. Using field-measured data of the clamping stroke during the tamping clamping stage, and setting the initial moment of the tamping pick's rotation to zero, the fitting results are as follows: Figure 2 As shown, the fitting function can effectively reflect the nonlinear evolution characteristics of the clamping stroke during the tamping operation, and can accurately express the differences in the maximum value of the clamping stroke for different mechanical states of the track bed. The goodness of fit of the clamping stroke at different measuring points ranges from 0.956 to 0.975, and all values ​​are greater than 0.95, indicating that the proposed tamping clamping stroke expression has high accuracy. The unknown parameters D1 range from 0.46 to 9.88, D2 ranges from -26.08 to -1.58, and D3 ranges from -1.94 to 21.97. Based on this, the variation intervals of D1, D2, and D3 are set to 0.4 to 10, -27 to -1, and -2 to 22, respectively.

[0085] In this embodiment, the expression reasoning for the clamping phase is as follows:

[0086] To further determine the reasonable values ​​of the unknown parameters, the response surface methodology was used to analyze the goodness of fit under different parameter combinations. Using the unknown parameters D1, D2, and D3 as experimental factors, and considering the number of experimental factors and the order of the response surface, the Box-Behnken method was used to design the experimental scheme, setting 17 parameter value combinations as shown in Table 1. The parameters of different combinations were then substituted into the measured data of the clamping stroke at each measuring point for fitting analysis to obtain the goodness of fit at each measuring point. Based on this, the average goodness of fit at each measuring point was calculated, thus yielding the comprehensive goodness of fit under different parameter combinations. The expression is shown in (9). This value serves as the response index, comprehensively reflecting the fitting effect at each measuring point. The calculation results of the comprehensive goodness of fit under different parameter combinations are shown in Table 1. Figure 3 .

[0087]

[0088] In the formula, Y i This represents the overall goodness of fit under the i-th set of parameter combinations. It represents the goodness of fit of measurement point j under the i-th parameter combination condition.

[0089] Table 1. Combinations of experimental factors for unknown parameters

[0090]

[0091] Response surface methodology uses the p-value to represent the significance level of the regression model. A p-value less than 0.01 indicates that the model is highly significant. The overall goodness-of-fit response surface regression p-value is 0.0001, indicating that the regression model has reached a highly significant level and possesses high predictive accuracy. The overall goodness-of-fit response surface is shown below. Figure 4 As can be seen, under the interaction of unknown parameters D1 and D2, and D1 and D3, the magnitudes of the overall goodness-of-fit response surface all exhibit a gradual decreasing trend from the center outwards. The overall goodness-of-fit response surface under the interaction of D1 and D3 is relatively steeper, indicating that the interaction between D1 and D3 is more significant. The overall goodness-of-fit contour lines are shown below. Figure 5 As can be seen, under the interaction of D1 and D2, and D1 and D3, the contour lines of the overall goodness of fit are close to ellipses, indicating that the interaction under both conditions is strong. The contour lines are relatively dense under the interaction of D1 and D3, indicating that their interaction effect is more significant.

[0092] Based on the response surface regression analysis results of the comprehensive goodness of fit, the optimal values ​​of the unknown parameters D1, D2, and D3 were obtained as 5.58, -27, and 16.92, respectively. Substituting these values ​​into equation (8), the field measured data of the clamping stroke were fitted again to verify the reliability of the optimal values ​​of the unknown parameters. The parameters P at different measuring points and the goodness of fit are shown in Table 2. It can be seen that the goodness of fit varies from 0.921 to 0.964, and all values ​​are greater than 0.92, indicating that under the specific condition that the unknown parameters D1, D2, and D3 take the optimal values, the fitting curves of the tamping clamping stroke at different measuring points still have high accuracy. There are large differences in the parameter P at different measuring points, ranging from 2.87 to 4.84.

[0093] Table 2 Fitting results at different measurement points

[0094]

[0095] From the above mechanical relationships, it can be seen that parameter P is related to the track bed support stiffness, which can be transformed to obtain the following formula:

[0096]

[0097] make Equation (10) can be simplified to:

[0098]

[0099] Using the corresponding fitting function of the self-written formula (11) in C language, the fitting analysis was performed on the parameters P at different measuring points and the measured track bed support stiffness K. The results are shown in […]. Figure 6 It can be seen that parameter P and track bed support stiffness K exhibit a significant negative correlation, with a correlation coefficient of 0.968 for the fitted curve. This indicates that the fitting result has high accuracy, and the derived expression is as follows:

[0100]

[0101] Substituting the calculated unknown parameters D1, D2, D3 and parameter P into equation (8), the final expression for the clamping stroke under the condition of not considering the vibration of the tamping device is obtained as follows:

[0102]

[0103] In this embodiment, the expression reasoning for the withdrawal phase is as follows:

[0104] After the clamping phase of the tamping operation is completed, the tamping pick undergoes a rotational behavior in the opposite direction to the previous phase, i.e., the early stage of the withdrawal phase. Field-measured clamping stroke data for the early stage of the withdrawal phase are extracted, and the initial time of this phase is set to 0s. The stroke change curves at different measuring points are obtained as follows: Figure 7As shown, the clamping stroke at different measuring points includes both straight lines and trigonometric function curves. The straight line reflects the rotational behavior of the tamping pick during this stage. The slope of the straight lines at different measuring points is the same, -170.35, indicating that for different track bed mechanical states, the tamping pick rotates and withdraws at the same angular velocity in the early stage of the withdrawal phase. Therefore, without considering the vibration of the tamping device, the expression for the clamping stroke in the early stage of the withdrawal phase of the tamping operation is:

[0105] x=x1-170.35·t (14)

[0106] In the formula, x1 is the maximum clamping stroke.

[0107] In this embodiment, considering the differences in tamping operations for ballast beds under different mechanical states, a basic expression for the motion behavior during the clamping stage is derived through theoretical assumptions and derivations. Key parameters are obtained through response surface analysis of measured data. Finally, a multi-stage simulation method for the tamping space is derived by combining the tamping operation's infeed and withdrawal movements and continuous vibration. Measured data of the clamping stroke during tamping operations show that the clamping stroke exhibits trigonometric function fluctuations throughout the entire tamping cycle. This is mainly because the tamping device experiences continuous vibration during operation to weaken the "hard" collision between the tamping pick and ballast particles, reducing pick wear and ballast breakage and pulverization. Simultaneously, the continuous vibration of the tamping device facilitates the squeezing and shifting of ballast particles towards the bottom of the ballast bed, improving the maintenance and repair effect of the tamping operation.

[0108] The expression for the trigonometric function curve of the tamping clamp stroke during the entire tamping operation cycle is as follows:

[0109] x = x0·cos(2πft)

[0110] In the formula, x0 is the vibration amplitude and f is the vibration frequency.

[0111] By combining the vertical movement characteristics of the tamping device during operation, a multi-stage simulation method for the tamping space can be derived:

[0112] During the tamping stage (0~t0), the tamping device vibrates continuously in the longitudinal direction and is inserted vertically to the specified depth at a certain speed, as shown in the following expression:

[0113] x = x0·cos(2πft)

[0114] y = -v·t

[0115] In the formula, y is the vertical displacement of the pick, and v is the speed at which the pick is inserted.

[0116] During the clamping stage (t0~t2), the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not yet rotated longitudinally. Let t1 be the moment when the tamping pick begins to rotate, while the vertical position of the tamping pick remains unchanged. The expression for this stage is as follows:

[0117]

[0118] y = y0

[0119] The withdrawal phase (t2~t4) involves a longitudinal rotation in the opposite direction to that of the clamping phase in the early stage, followed by vertical upward linear motion after time t3. The expression for this phase is as follows:

[0120]

[0121]

[0122] Example 2

[0123] This embodiment 2 provides a non-transitory computer-readable storage medium for storing computer instructions. When these computer instructions are executed by a processor, they implement the multi-stage simulation method for tamping workspace as described above. The method includes:

[0124] During the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically at a certain speed to the designated depth.

[0125] During the clamping phase, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not yet rotated longitudinally, and the vertical position of the tamping pick remains unchanged.

[0126] During the withdrawal phase, a longitudinal rotation occurs in the early stage that is opposite to that during the clamping phase.

[0127] Example 3

[0128] This embodiment 3 provides a computer device, including a memory and a processor, wherein the processor and the memory communicate with each other, the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute a multi-stage simulation method for tamping work space, the method including:

[0129] During the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically at a certain speed to the designated depth.

[0130] During the clamping phase, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not yet rotated longitudinally, and the vertical position of the tamping pick remains unchanged.

[0131] During the withdrawal phase, a longitudinal rotation occurs in the early stage that is opposite to that during the clamping phase.

[0132] Example 4

[0133] This embodiment 4 provides an electronic device, including: a processor, a memory, and a computer program; wherein, the processor is connected to the memory, and the computer program is stored in the memory. When the electronic device is running, the processor executes the computer program stored in the memory to cause the electronic device to execute instructions to implement the multi-stage simulation method for tamping work space as described above, the method including:

[0134] During the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically at a certain speed to the designated depth.

[0135] During the clamping phase, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not yet rotated longitudinally, and the vertical position of the tamping pick remains unchanged.

[0136] During the withdrawal phase, a longitudinal rotation occurs in the early stage that is opposite to that during the clamping phase.

[0137] In summary, the multi-stage simulation method and system for tamping operation space provided by this invention, through theoretical derivation, firstly proposes the mechanical relationship of the tamping device during the clamping stage; through response surface analysis of field measured data of the clamping stroke, the key parameters of the mechanical relationship of the tamping device during the clamping stage are obtained; and firstly, a realistic simulation method for the nonlinear motion behavior of tamping operation considering the mechanical state of the track bed is proposed. The multi-stage simulation algorithm for tamping operation space proposed in this invention can effectively consider the mechanical state of the track bed at the operation location, and firstly realizes the realistic simulation of the nonlinear motion behavior of the tamping device during operation.

[0138] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0139] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0140] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0141] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment, whereby a series of operational steps are performed to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0142] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that, based on the technical solutions disclosed in the present invention, various modifications or variations that can be made by those skilled in the art without creative effort should be included within the scope of protection of the present invention.

Claims

1. A multi-stage simulation method for tamping operation space, characterized in that, include: During the tamping stage, the tamping device vibrates continuously in the longitudinal direction and is inserted vertically at a certain speed to the designated depth. During the clamping phase, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation. Before the tamping pick overcomes the initial force of the ballast, the tamping pick has not yet rotated longitudinally, and the vertical position of the tamping pick remains unchanged. During the withdrawal phase, a longitudinal rotation occurs in the early stage that is opposite to that during the clamping phase. in, The tamping pick of the tamping device is fixed to the lower end of the tamping arm. Considering the two together as a rod structure, the force during the clamping stage of the tamping operation, without considering the vibration of the tamping device, the rotational behavior of the rod around the pivot pin connected to the fixed support under the action of clamping hydraulic pressure and ballast resistance is expressed as follows: ； In the formula, Let be the moment of inertia of the rod. For the tamping operation time, the rotation angle is... The arc length is During the operation, the resultant force of the ballast particles acting on the tamping pick is The distance from the force to the pivot pin connecting the fixed bracket is The clamping hydraulic pressure applied to the rod during the operation is: The distance from the force to the pivot pin connecting the fixed bracket is ; ； In the formula, The initial resistance of the ballast acting on the tamping pick. For the track bed support stiffness, These are constant coefficients; ； In the formula, The initial clamping fluid pressure, This is a constant coefficient, and its value is related to the cylinder diameter of the clamping cylinder and the flow parameters of the relief valve. 。 2. The multi-stage simulation method for tamping operation space according to claim 1, characterized in that, but: make , ,but: Therefore, without considering the vibration of the tamping device, the clamping stroke of the tamping pick during the clamping stage is: In the formula, , , All are constants. It is related to the support stiffness of the track bed.

3. The multi-stage simulation method for tamping operation space according to claim 2, characterized in that, parameter Related to the track bed support stiffness, the following formula is obtained after transformation: make , ,but: ； parameter With track bed support stiffness They exhibit a negative correlation, with a correlation coefficient of 0.968 for the fitted curve. .

4. The multi-stage simulation method for tamping operation space according to claim 3, characterized in that, The calculated unknown parameters , , and parameters Substituting into the general solution of the clamping stroke, we obtain the final expression for the clamping stroke without considering the vibration of the tamping device: 。 5. The multi-stage simulation method for tamping operation space according to claim 4, characterized in that, Without considering the vibration of the tamping device, the expression for the clamping stroke in the early stage of the tamping operation withdrawal phase is: ； In the formula, This is the maximum clamping stroke.

6. A multi-stage simulation system for tamping operation space, characterized in that, The system includes a control module configured to: during the tamping phase, the tamping device vibrates continuously in the longitudinal direction, vertically inserting itself to a designated depth at a certain speed; during the clamping phase, the hydraulic pressure of the clamping cylinder continuously increases to overcome the ballast resistance during the clamping operation; before the tamping pick overcomes the initial force of the ballast, the tamping pick has not rotated longitudinally, and its vertical position remains unchanged; during the withdrawal phase, a longitudinal rotation occurs in the early stage, opposite to that of the clamping phase; wherein... The tamping pick of the tamping device is fixed to the lower end of the tamping arm. Considering the two together as a rod structure, the force during the clamping stage of the tamping operation, without considering the vibration of the tamping device, the rotational behavior of the rod around the pivot pin connected to the fixed support under the action of clamping hydraulic pressure and ballast resistance is expressed as follows: ； In the formula, Let be the moment of inertia of the rod. For the tamping operation time, the rotation angle is... The arc length is During the operation, the resultant force of the ballast particles acting on the tamping pick is The distance from the force to the pivot pin connecting the fixed bracket is The clamping hydraulic pressure applied to the rod during the operation is: The distance from the force to the pivot pin connecting the fixed bracket is ; ； In the formula, The initial resistance of the ballast acting on the tamping pick. For the track bed support stiffness, These are constant coefficients; ； In the formula, The initial clamping fluid pressure, This is a constant coefficient, and its value is related to the cylinder diameter of the clamping cylinder and the flow parameters of the relief valve. 。 7. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium is used to store computer instructions, which, when executed by a processor, implement the multi-stage simulation method for tamping work space as described in any one of claims 1-5.

8. A computer device, characterized in that, It includes a memory and a processor, the processor and the memory communicating with each other, the memory storing program instructions that can be executed by the processor, and the processor calling the program instructions to execute the multi-stage simulation method for tamping work space as described in any one of claims 1-5.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to cause the electronic device to execute instructions that implement the multi-stage simulation method for tamping work space as described in any one of claims 1-5.

Images