CN117592156A - Multi-stage simulation method and system for tamping working space - Google Patents
Multi-stage simulation method and system for tamping working space Download PDFInfo
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Abstract
The invention provides a multi-stage simulation method and a system for tamping operation space, which belong to the technical field of railway ballasted track maintenance management, wherein in the tamping stage, a tamping device in the longitudinal direction continuously vibrates and is vertically inserted to a designated depth at a certain speed; in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged; in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase. The invention can effectively consider the mechanical state of the ballast bed at the operation position, and realizes the real simulation of the nonlinear motion behavior of the tamping device in the operation process; the method comprises the steps of obtaining a motion behavior expression in a clamping stage by considering the difference of tamping operations aiming at ballast beds in different mechanical states, obtaining key parameters through analysis of a measured data response surface, and combining tamping operation tamping, withdrawing motion and continuous vibration.
Description
Technical Field
The invention relates to the technical field of railway ballasted track maintenance management, in particular to a tamping operation space multi-stage simulation method and system.
Background
The large road maintenance machine is mainly used for extruding and compacting railway ballasts towards the sleeper bottom through tamping and clamping operation, so that the maintenance effect of improving the sleeper bottom compactness and improving the elasticity of the railway ballast is achieved. At present, different types of tamping cars at home and abroad are operated in an asynchronous clamping mode, the method presets the maximum clamping oil pressure before tamping operation, along with the progress of the clamping operation, the ballast resistance born by the tamping pick is continuously increased, the oil pressure of the clamping oil cylinder is also continuously increased, and the operation at the stage is stopped when the magnitude of the oil pressure reaches the maximum clamping oil pressure. Aiming at the ballast beds in different mechanical states, the interaction of the tamping pick and the ballast in the clamping process is greatly different, so that the clamping stroke of the tamping pick is greatly changed. However, in the current numerical simulation research of students at home and abroad aiming at tamping operation, the tamping clamping operation is simplified into linear rotation, the nonlinear rotation behavior of the tamping clamping operation caused by the ballast resistance is not considered yet, the maximum value of the clamping stroke is set to be a fixed value, and the change of the clamping stroke caused by the mechanical state difference of the ballast bed is not considered yet.
The large-scale road maintenance machinery tamping operation is a necessary means for maintenance and repair of the ballasted track, the geometric shape and position of the track can be effectively improved, but the tamping operation is easy to cause the crushing of ballast particles, the mechanical property of a ballasted track bed is reduced, the service life of the ballasted track is shortened, and how to scientifically and reasonably develop the maintenance and repair operation of the large-scale road maintenance machinery is important, so that the system research on the tamping operation by using a numerical simulation means is very necessary. However, the tamping operation comprises complex mechanical movements such as translation, rotation, vibration and the like, the mechanical action mechanism of the tamping operation on the ballast bed is very complex, and in addition, the motion behaviors of the tamping operation on the ballast beds with different mechanical states can be obviously changed. Therefore, how to truly simulate the complex exercise behavior of the tamping operation is a key technical problem at present.
The existing tamping operation simulation method has the following two defects:
(1) The existing tamping operation simulation method does not consider the mechanical state of the ballast bed at the operation position, the tamping operation clamping stroke is set to be a fixed value, and in the on-site tamping maintenance operation, the mechanical effect of a large machine on the ballast beds with different mechanical states can be obviously changed, and on-site actual measurement data show that the change of the tamping clamping stroke aiming at the ballast beds with different mechanical states is up to 2 times or more. Therefore, the existing tamping operation simulation method is difficult to truly reflect the difference of track bed clamping strokes aiming at different mechanical states.
(2) The prior tamping operation simulation method simulates the tamping clamping action into simple linear rotation, and the field actual measurement data show that the tamping device can generate remarkable nonlinear rotation in the tamping operation clamping stage. Therefore, the existing tamping operation simulation method is difficult to truly restore the clamping track of the tamping operation.
Disclosure of Invention
The invention aims to provide a multi-stage simulation method and system for a tamping working space, which are used for solving at least one technical problem in the background technology.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in one aspect, the present invention provides a method of multi-stage simulation of a tamping working space, comprising:
in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction;
in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged;
in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
Further, the tamping pick of the tamping device is fixed at the lower end of the tamping arm, the tamping pick and the tamping arm are combined to be regarded as a rod piece structure, the rod piece is stressed in the clamping stage of tamping operation, and under the action of clamping hydraulic force and railway ballast resistance force without considering the vibrating condition of the tamping device, the rotation behavior expression taking a shaft pin connected with a fixing support as the center takes place as follows:
wherein J is the rotational inertia of the rod piece, t is the tamping operation time, the rotational angle is theta, the arc length is x, and the resultant force of the ballast particles acting on the tamping pick in the operation process is F 1 The distance between the acting force and the shaft pin connected with the fixed bracket is l 1 The method comprises the steps of carrying out a first treatment on the surface of the The clamping hydraulic force applied to the rod member during operation is F 2 The distance between the acting force and the shaft pin connected with the fixed bracket is l 2 ；
F 1 ＝M+β·K·x；
Wherein M is the initial resistance of the ballast on the tamping pick, K is the supporting rigidity of the ballast bed, and beta is a constant coefficient;
where N is the initial clamping hydraulic pressure,is a constant coefficient, and the constant coefficient is related to parameters such as the cylinder diameter of the clamping cylinder, the flow of the overflow valve and the like.
x＝l 3 ·θ。
Further, then:
order theThen:
then, under the condition of not considering the vibration of the tamping device, the tamping pick clamping stroke in the clamping stage is as follows:
x＝D 1 ·e Pt +D 2 ·e -Pt +D 3
wherein D is 1 、D 2 、D 3 Are constant and P is related to the ballast bed supporting rigidity.
Further, the parameter P is related to the ballast bed supporting rigidity, and the following formula is obtained through transformation:
order theThen:
the parameter P and the ballast bed supporting rigidity K show negative correlation, and the correlation coefficient of a fitting curve is 0.968, so that the following steps are obtained:
further, the calculated unknown parameter D 1 、D 2 、D 3 And the parameter P is brought into the clamping stroke general solution to obtain a final expression of the clamping stroke under the condition of not considering the vibration of the tamping device:
further, under the condition that the vibration of the tamping device is not considered, the expression of the clamping stroke at the early stage of the tamping operation withdrawal stage is as follows:
x＝x 1 -170.35·t；
wherein x is 1 Is the maximum clamping travel.
In a second aspect, the present invention provides a tamping working space multistage simulation system, comprising a control module configured to: in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction; in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged; in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
In a third aspect, the present invention provides a non-transitory computer readable storage medium for storing computer instructions which, when executed by a processor, implement a tamping working space multi-stage simulation method as described above.
In a fourth aspect, the invention provides a computer device comprising a memory and a processor, the processor and the memory being in communication with each other, the memory storing program instructions executable by the processor, the processor invoking the program instructions to perform a tamping job space multi-stage simulation method as described above.
In a fifth aspect, the present invention provides an electronic device, comprising: 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, said processor executing said stored computer program when the electronic device is running, to cause the electronic device to execute instructions for implementing the tamping working space multi-stage simulation method as described above.
The invention has the beneficial effects that: the mechanical state of the ballast bed at the operation position can be effectively considered, and the real simulation of the nonlinear motion behavior of the tamping device in the operation process is realized for the first time; the method comprises the steps of considering the differences of tamping operations of ballast beds in different mechanical states, obtaining a basic expression of motion behaviors in a clamping stage through theoretical assumption and deduction, obtaining key parameters through analysis of measured data response surfaces, and finally combining tamping operation tamping, withdrawing motion and continuous vibration.
The advantages of additional aspects of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a tamping device in a clamping stage according to an embodiment of the present invention.
Fig. 2 is a schematic view of a clamping stroke fit during a clamping phase according to an embodiment of the present invention. FIG. 2 (a) is a first measurement point; FIG. 2 (b) is a second measurement point; FIG. 2 (c) is station three; FIG. 2 (d) is station four; FIG. 2 (e) is station five; FIG. 2 (f) shows a measurement point six.
Fig. 3 is a schematic diagram of a comprehensive goodness-of-fit calculation result according to an embodiment of the present invention.
Fig. 4 is a graph of a complex fitness response surface according to an embodiment of the present invention. Wherein FIG. 4 (a) is D 1 And D 2 Interaction, FIG. 4 (b) is D 1 And D 3 Interaction.
FIG. 5 is a plot of a composite goodness-of-fit contour plot according to an embodiment of the present invention. Wherein FIG. 5 (a) is D 1 And D 2 Interaction, FIG. 5 (b) is D 1 And D 3 Interaction.
FIG. 6 is a graph showing a P-K fitting curve according to an embodiment of the present invention.
Fig. 7 is a schematic view of a clamp stroke fit at the early stage of withdrawal according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by way of the drawings are exemplary only and should not be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and/or groups thereof.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In order that the invention may be readily understood, a further description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings and are not to be construed as limiting embodiments of the invention.
It will be appreciated by those skilled in the art that the drawings are merely schematic representations of examples and that the elements of the drawings are not necessarily required to practice the invention.
Example 1
In this embodiment 1, there is first provided a tamping working space multistage simulation system, including a control module configured to: in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction; in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged; in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
In this embodiment, the method for implementing multistage simulation of the tamping working space by using the system includes: in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction; in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged; in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
In this embodiment, the mechanical relational reasoning of the clamping stage includes the following:
the tamping pick of the tamping device is fixed at the lower end of the tamping arm, the tamping pick and the tamping arm are combined to be a rod piece structure, the stress at the clamping stage of tamping operation is shown in figure 1, in the figure, O represents a shaft pin connected with a fixed support, and is a fixed hinged support of the rod piece structure; a is a pick head, and the resultant force of the ballast particles acting on the tamping pick in the operation process is F 1 The distance from the acting force to the point O is l 1 The method comprises the steps of carrying out a first treatment on the surface of the B represents a shaft pin connected with the clamping oil cylinder, and the clamping hydraulic force applied to the rod piece in the operation process is F 2 The distance from the acting force to the point O is l 2 . Under the condition of not considering the vibration of the tamping device, the rod piece generates rotation behavior taking the O point as the center under the action of clamping hydraulic pressure and railway ballast resistance, the rotation angle is theta, the arc length is x, and the expression is as follows:
wherein J is the moment of inertia of the rod piece, and t is the tamping time.
The tamping operation is carried out at the initial moment of entering the clamping stage, the tamping pick bears the initial resistance of the ballast particles, and during the clamping operation, the ballast resistance borne by the tamping pick increases approximately linearly along with the increase of the clamping stroke, and the increasing rate is in direct proportion to the supporting rigidity of the ballast bed. Therefore, the resistance expression of the ballast particles acting on the tamping pick in the tamping operation clamping stage is as follows:
F 1 ＝M+β·K·x (2)
wherein M is the initial resistance of the ballast on the tamping pick, K is the supporting rigidity of the ballast bed, and beta is a constant coefficient.
At the initial moment of the clamping stage, a certain initial acting force is applied to the tamping arm by the clamping oil cylinder, and in the clamping operation process, the stroke of the oil cylinder linearly grows along with the increase of the clamping stroke, and the corresponding clamping hydraulic pressure expression is as follows:
where N is the initial clamping hydraulic pressure,is a constant coefficient, and the constant coefficient is related to parameters such as the cylinder diameter of the clamping cylinder, the flow of the overflow valve and the like.
In the tamping clamping operation process, the relation between the clamping stroke and the rotating angle is as follows:
x＝l 3 ·θ (4)
bringing expressions (2), (3), (4) into expression (1) yields:
the above transformation can be obtained:
order theThen equation (6) can be simplified as:
it can be seen that equation (7) is a constant coefficient non-homogeneous linear differential equation, which is solved in general:
x＝D 1 ·e Pt +D 2 ·e -Pt +D 3 (8)
wherein D is 1 、D 2 、D 3 Are constant.
Under the condition of not considering the vibration of the tamping device, the formula (8) is a general expression of the tamping pick clamping stroke in the clamping stage, wherein P is related to the supporting rigidity of the ballast bed, and D 1 ～D 3 Is an unknown parameter.
Tamping clamping travel fitting function obtained by self-programming of C languageAnd (3) using actual measurement data of the clamping stroke in the tamping clamping stage, and resetting the initial moment of rotation of the tamping pick in the clamping stage to zero, wherein the fitting result is shown in figure 2. The fitting function can effectively reflect nonlinear evolution characteristics of different clamping strokes in the tamping operation process, can accurately express the difference of maximum values of the clamping strokes of the ballast beds in different mechanical states, has the variation range of fitting goodness of the clamping strokes of different measuring points of 0.956-0.975, has values of more than 0.95, and can be known that the provided tamping clamping stroke expression has higher accuracy. Unknown parameter D 1 The variation range of (C) is 0.46-9.88, D 2 The change range of (C) is-26.08 to-1.58, D 3 The variation range of (C) is-1.94-21.97, and D is accordingly determined 1 、D 2 、D 3 The change intervals are respectively set to be 0.4-10, -27 to-1, -2-22.
In this embodiment, the expression reasoning for the clamping phase is as follows:
in order to further determine the reasonable value of the unknown parameters, a response surface method is adopted to analyze the fitting goodness under the combination condition of different parameters. With unknown parameter D 1 、D 2 、D 3 For test factors, taking the number of the test factors and the order of response surfaces into consideration, designing a test scheme by using a Box-Behnken method, setting 17 groups of parameter value combinations, respectively taking parameters of different combinations into measured data of clamping strokes of all measuring points to perform fitting analysis to obtain fitting goodness of all the measuring points, calculating an average value of the fitting goodness of all the measuring points on the basis of the fitting goodness of all the measuring points, and obtaining comprehensive fitting goodness under the combined condition of different parameters, wherein an expression is shown in (9), and the fitting effect of all the measuring points can be comprehensively reflected by taking the value as a response index. The calculation results of the comprehensive fitting goodness under the different parameter combination conditions are shown in fig. 3.
Wherein Y is i Represents the comprehensive goodness of fit under the i-th group of parameter combination conditions,and (5) representing the goodness of fit of the measuring point j under the i-th group parameter combination condition.
Table 1 combinations of test factors for unknown parameters
The response surface method represents the significance level of the regression model by a p value, and when the p value is less than 0.01, the model is extremely significant. The regression p value of the response surface of the comprehensive fitting goodness is 0.0001, which shows that the regression model reaches a very significant level and has higher prediction precision. The comprehensive goodness-of-fit response curve is shown in FIG. 4, which shows that, in the unknown quantity D 1 And D 2 、D 1 And D 3 Under the interaction of (D), the magnitude of the comprehensive goodness-of-fit response curved surface shows the evolution trend of gradually decaying from the center to the periphery 1 And D 3 The complex goodness-of-fit response surface for interaction is relatively steep, indicating D 1 And D 3 The interaction of (a) is more pronounced. The overall goodness-of-fit contour is shown in FIG. 5, as can be seen at D 1 And D 2 、D 1 And D 3 Under the interaction of (D), the contour lines of the comprehensive fitting goodness are close to ellipses, which shows that the interaction under two conditions is stronger, D 1 And D 3 The contour lines under interaction are relatively dense, indicating that the interaction effect is more remarkable.
Obtaining an unknown parameter D according to the regression analysis result of the response surface of the comprehensive fitting goodness 1 、D 2 、D 3 The optimal values of the parameters are 5.58, -27 and 16.92 respectively, the optimal values are brought into the step (8), fitting analysis is carried out again on the clamping stroke field actual measurement data, and the reliability of the optimal values of the unknown parameters is verified. The parameters P of different measuring points and the goodness of fit are obtained from the table 2, and the change range of the goodness of fit is 0.921 to 0.964, the values are all more than 0.92, which shows that the parameters D are unknown 1 、D 2 、D 3 Under the specific condition of taking the optimal value, the fitting curve of the tamping clamping strokes of different measuring points still has higher accuracy. There is a large difference in the parameters P of different measuring pointsThe variation range is 2.87-4.84.
TABLE 2 fitting results at different measurement points
From the above mechanical relation, the parameter P is related to the ballast bed supporting rigidity, and is transformed to the formula:
order theThen equation (10) can be simplified as:
and adopting a fitting function corresponding to the self-programming formula (11) of the C language to carry out fitting analysis on parameters P of different measuring points and the support rigidity K of the track bed actually measured on site, wherein the result is shown in figure 6. It can be seen that the parameter P and the ballast bed supporting rigidity K show obvious negative correlation, the correlation coefficient of the fitting curve is 0.968, the fitting result is high in accuracy, and the obtained expression is as follows:
unknown parameter D obtained by calculation 1 、D 2 、D 3 And the parameter P is brought into formula (8), the final expression of the clamping stroke is obtained under the condition of not considering the vibration of the tamping device, and the final expression is as follows:
in this embodiment, the expression reasoning for the withdrawal phase is as follows:
after the clamping stage of tamping operation is finished, the tamping pick rotates reversely to the previous stage, namely, the front stage of the withdrawal stage. And extracting clamping travel data in the early stage of the field actual measurement withdrawal stage, setting the initial time of the stage to 0s, and obtaining travel change curves of different measuring points as shown in fig. 7. It can be seen that the clamping strokes of different measuring points comprise two types of linear and trigonometric function curves, wherein the linear reflects the rotation behavior of the tamping pick at the stage. The slopes of the straight lines of different measuring points are the same and are-170.35, which shows that the tamping pick is rotated and withdrawn at the same angular speed at the early stage of the withdrawal stage aiming at track beds in different mechanical states. Therefore, the expression of the holding stroke at the early stage of the withdrawal of the tamping operation is as follows, regardless of the vibration of the tamping device:
x＝x 1 -170.35·t (14)
wherein x is 1 Is the maximum clamping travel.
In the embodiment, the difference of tamping operations aiming at ballast beds in different mechanical states is considered, a basic expression of the motion behavior in the clamping stage is obtained through theoretical assumption and deduction, key parameters are obtained through analysis of the response surface of measured data, and finally the tamping space multi-stage simulation method is obtained by combining the tamping operations of tamping in, out motion and continuous vibration. According to actual measurement data of clamping strokes in tamping operations, trigonometric function fluctuation exists in the clamping strokes in the whole tamping operation period, and the continuous vibration of the tamping device can occur mainly in the operation process, so that hard collision of tamping pick and ballast particles is weakened, abrasion of the tamping pick and crushing and pulverization of the ballast are reduced, meanwhile, the continuous vibration of the tamping device is favorable for extrusion dislocation of the ballast particles to the sleeper bottom, and maintenance and repair effects of the tamping operation are improved.
The expression of the tamping clamping stroke trigonometric function curve during the whole tamping working period is as follows:
x＝x 0 ·cos(2πft)
wherein x is 0 For vibration amplitude, f is vibration frequency.
By combining the vertical movement characteristics of the tamping device in the operation process, the tamping space multi-stage simulation method can be obtained:
stage of tamping (0-t) 0 ) The tamping device continuously vibrates in the longitudinal direction, and is inserted to a designated depth in the vertical direction at a certain speed, and the expression is as follows:
x＝x 0 ·cos(2πft)
y＝-v·t
wherein y is the vertical displacement of the tamping pick, and v is the downward inserting speed of the tamping pick.
Clamping stage (t) 0 ～t 2 ) The hydraulic pressure of the clamping cylinder is continuously increased at the stage to overcome the resistance of the railway ballast in the clamping operation process, the tamping pick does not rotate in the longitudinal direction before overcoming the initial acting force of the railway ballast, and the moment when the tamping pick starts to rotate is expressed as t 1 The position of the tamping pick in the vertical direction is kept unchanged. The phase expression is as follows:
y＝y 0
withdrawal phase (t) 2 ～t 4 ) Rotation in the longitudinal direction opposite to the clamping phase, t 3 After this moment, a straight upward vertical movement takes place. The phase expression is as follows:
example 2
Embodiment 2 provides a non-transitory computer readable storage medium for storing computer instructions which, when executed by a processor, implement a tamping job space multistage simulation method as described above, the method comprising:
in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction;
in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged;
in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
Example 3
Embodiment 3 provides a computer device including a memory and a processor, the processor and the memory being in communication with each other, the memory storing program instructions executable by the processor, the processor invoking the program instructions to perform a tamping job space multi-stage simulation method, the method comprising:
in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction;
in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged;
in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
Example 4
Embodiment 4 provides an electronic apparatus including: a processor, a memory, and a computer program; wherein the processor is coupled to the memory and the computer program is stored in the memory, the processor executing the computer program stored in the memory when the electronic device is operating to cause the electronic device to execute instructions for implementing a tamping working space multi-stage simulation method as described above, the method comprising:
in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction;
in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged;
in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
In summary, according to the multi-stage simulation method and system for the tamping operation space provided by the embodiment of the invention, a mechanical relation of the tamping device in the clamping stage is initially provided through theoretical deduction; key parameters of the mechanical relation of the tamping device in the clamping stage are obtained through the response surface analysis of the clamping stroke field actual measurement data; the real simulation method of the non-linear motion behavior of the tamping operation considering the mechanical state of the ballast bed is firstly provided. The multi-stage simulation algorithm of the tamping operation space provided by the invention can effectively consider the mechanical state of the ballast bed at the operation position, and initially realizes the real simulation of the nonlinear motion behavior of the tamping device in the operation process.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it should be understood that various changes and modifications could be made by one skilled in the art without the need for inventive faculty, which would fall within the scope of the invention.
Claims (10)
1. A method of multi-stage simulation of a tamping working space, comprising:
in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction;
in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged;
in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
2. The multi-stage simulation method of the tamping working space according to claim 1, wherein the tamping pick of the tamping device is fixed at the lower end of the tamping arm, and the tamping pick are combined to be a rod member structure, and the rod member is subjected to the rotation behavior expression taking a shaft pin connected with the fixing support as a center under the action of the clamping hydraulic force and the railway ballast resistance force without considering the vibration condition of the tamping device under the condition that the force is stressed in the clamping stage of the tamping working, wherein the rotation behavior expression is as follows:
wherein J is the rotational inertia of the rod piece, t is the tamping operation time, the rotational angle is theta, the arc length is x, and the resultant force of the ballast particles acting on the tamping pick in the operation process is F 1 The distance between the acting force and the shaft pin connected with the fixed bracket is l 1 The method comprises the steps of carrying out a first treatment on the surface of the The clamping hydraulic force applied to the rod member during operation is F 2 The distance between the acting force and the shaft pin connected with the fixed bracket is l 2 ；
F 1 ＝M+β·K·x；
Wherein M is the initial resistance of the ballast on the tamping pick, K is the supporting rigidity of the ballast bed, and beta is a constant coefficient;
where N is the initial clamping hydraulic pressure,is a constant coefficient, and the constant coefficient is related to parameters such as the cylinder diameter of the clamping cylinder, the flow of the overflow valve and the like.
x＝l 3 ·θ。
3. The method of multi-stage simulation of a tamping working space according to claim 2,
then:
order theThen:
then, under the condition of not considering the vibration of the tamping device, the tamping pick clamping stroke in the clamping stage is as follows:
x＝D 1 ·e Pt +D 2 ·e -Pt +D 3
wherein D is 1 、D 2 、D 3 Are constant and P is related to the ballast bed supporting rigidity.
4. A method of multistage simulation of a tamping working space according to claim 3, wherein the parameter P is related to the ballast bed support stiffness, transformed to yield the following formula:
order theThen:
the parameter P and the ballast bed supporting rigidity K show negative correlation, and the correlation coefficient of a fitting curve is 0.968, so that the following steps are obtained:
5. the method of multi-stage simulation of a tamping working space according to claim 4,
unknown parameter D obtained by calculation 1 、D 2 、D 3 And the parameter P is brought into the clamping stroke general solution to obtain a final expression of the clamping stroke under the condition of not considering the vibration of the tamping device:
6. a multi-stage simulation method of a tamping working space according to claim 5, wherein the expression of the clamping stroke at the early stage of the withdrawal of the tamping working is as follows, regardless of the vibration of the tamping device:
x＝x 1 -170.35·t；
wherein x is 1 Is the maximum clamping travel.
7. A tamping working space multi-stage simulation system, comprising a control module configured to: in the tamping stage, the tamping device continuously vibrates in the longitudinal direction and is inserted to a designated depth at a certain speed in the vertical direction; in the clamping stage, the hydraulic pressure of the clamping cylinder is continuously increased to overcome the resistance of the railway ballast in the clamping operation process, and before the tamping pick overcomes the initial acting force of the railway ballast, the tamping pick does not rotate in the longitudinal direction, and the position of the tamping pick in the vertical direction is kept unchanged; in the withdrawal phase, a rotation takes place longitudinally in the front phase, opposite to the clamping phase.
8. A non-transitory computer readable storage medium storing computer instructions which, when executed by a processor, implement the tamping working space multistage simulation method of any one of claims 1 to 6.
9. A computer device comprising a memory and a processor, the processor and the memory being in communication with each other, the memory storing program instructions executable by the processor, the processor invoking the program instructions to perform the tamping working space multi-stage simulation method of any of claims 1-6.
10. An electronic device, comprising: 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, said processor executing said computer program stored in the memory when the electronic device is running, to cause the electronic device to execute instructions for implementing a tamping working space multi-stage simulation method according to any one of claims 1 to 6.
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