Contact net plane arrangement design method based on ideal grinding crack of pantograph sliding block

Abstract

The invention relates to the field of rail transit pantograph-catenary relations, and discloses a pantograph slide block ideal grinding crack-based catenary plane arrangement design method, which comprises the following steps of 1, designing an ideal grinding crack curve of a pantograph slide block; step 2, carrying out preliminary overhead line system plane layout design to obtain a pull-out value of the overhead line system, and calculating the length of the overhead line system; 3, respectively calculating the wear contribution value of each pull-out value interval on the slide block to the pantograph slide block; step 4, calculating and drawing a predicted wear crack curve according to the wear contribution value; 5, the predicted grinding crack curve and the ideal grinding crack curve are subjected to benchmarking, a design deviation value is obtained, when the design deviation value is larger than an expected deviation value, the contact net arrangement is adjusted, and the steps 2-5 are repeated; and when the design deviation value is smaller than the expected deviation value, overhead line system arrangement is completed. And the actual wear is closer to the expectation.

Description

Technical Field

[0001] The invention relates to the field of rail transit pantograph-catenary relationship, and in particular to a contact network plane layout design method based on an ideal wear mark of a pantograph slider. Background Art

[0002] The pantograph slider is a key component of rail transit trains. Its main function is to ensure stable power supply to electric trains through good contact with the contact network. It is a consumable part. When the minimum residual height of the slider is worn to the limit value, the slider needs to be replaced.

[0003] However, during actual operation, the slider usually suffers from uneven wear, which causes the minimum residual height to reach the design value earlier, so the slider has to be replaced, which increases the cost and replacement frequency of the slider and reduces operational efficiency.

[0004] The pull-out value refers to the distance that the contact line deviates from the center of the pantograph at the positioning point. In the prior art, the expected wear curve of the slider is optimized by adjusting the pull-out value and the contact network length, but the actual wear is often far from expectations. Therefore, a contact network plane layout design method based on the wear marks of the pantograph slider is needed to make the actual wear closer to expectations, so as to adjust the contact network layout in time to achieve cost reduction and efficiency improvement. Summary of the invention

[0005] The present invention aims to provide a contact network plane layout design method based on the ideal wear mark of the pantograph slider, so that the actual wear is closer to the expected one.

[0006] To achieve the above object, the present invention adopts the following technical solution: a method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider, comprising the following steps:

[0007] Step 1: Design an ideal wear curve of the pantograph slider;

[0008] Step 2: Conduct preliminary contact network layout design to obtain contact network pull-out value;

[0009] Step 3, calculating the length of each section of the overhead contact network in sequence according to the pull-out value interval and mileage order, and calculating the wear contribution value of the corresponding length of the overhead contact network to the pantograph slider;

[0010] Step 4: Calculate and draw the expected wear scar curve according to the wear contribution value;

[0011] Step 5. Compare the expected wear mark curve with the ideal wear mark curve to obtain the design deviation value. When the design deviation value is greater than the expected deviation value, adjust the contact network layout and repeat steps 2 to 5. When the design deviation value is less than the expected deviation value, complete the contact network layout.

[0012] The beneficial effects of this program are:

[0013] In the prior art, the rigid contact network is designed independently, only considering its own layout uniformity, and the model is simple. It is impossible to manage the wear marks of the pantograph slider in an expected manner, resulting in the slider wear being far from the expected, causing great waste of resources and mismatching problems between the pantograph and the network in the later stage. In this scheme, a computer is used for reverse design. First, the ideal wear mark curve of the pantograph slider is designed, and the design is carried out with the ideal wear mark curve as the final goal. Under the ideal wear mark curve, the slider wears evenly and has a high utilization rate. That is, after the slider is worn, the residual height of the main wear area of ​​the slider is close to the limit value of the minimum residual height (if it exceeds the limit value, a safety accident may occur).

[0014] Then, the contact network is preliminarily designed. According to the range of the pull-out value, the slider is divided into multiple pull-out value intervals. For example, if the pull-out value range is [100mm, -100mm], this scheme can divide the pull-out value interval into [100mm, 90mm], [90mm, 8

[0015] 0mm]…[-80mm,-90mm], [-90mm,-100mm] twenty intervals, and calculate the wear contribution value of each interval at the corresponding position on the slider (using a computer can divide it into more intervals, thereby increasing the accuracy of the calculation).

[0016] Since the more the wear contribution value accumulates, the deeper the wear scar is, the estimated wear scar curve can be obtained according to the wear contribution value of each interval. Based on the deviation between the estimated wear scar curve and the ideal wear scar curve, it can be determined whether the contact network layout needs to be adjusted. Since the pull-out value interval has been divided, adjustments can be made in each area, which increases the efficiency of the adjustment.

[0017] Furthermore, the middle section of the ideal wear scar curve is straight, the end section of the ideal wear scar curve is higher than the middle section, and a transition curve is provided between the end section and the middle section.

[0018] With such a setting, under the ideal wear mark curve, the slider wears evenly and has a high utilization rate, that is, after the slider is worn, the residual height of the main wear area of ​​the slider is close to the limit value of the minimum residual height, so the middle section is straight; and because the contact network can be regarded as making reciprocating motion laterally on the slider when the train is running, there should be a transition curve between the end section and the middle section to achieve smooth movement; if the change rate between the end section and the middle section is too large, then when the positioning point passes through this area, the slider and the contact network will jump, which will increase the wear of this area, so a transition curve needs to be set in this area.

[0019] Furthermore, in step 2, the specific steps for conducting preliminary contact network plane layout design are: first complete the plane layout design of the flexible contact network, and then complete the plane layout design of the rigid contact network: divide the anchor sections of the contact network, select corresponding layout models for different anchor sections, confirm the mileage and pull-out values ​​of each control point, and input the plane layout data of the contact network into the database.

[0020] Further, in step 2, the arrangement model includes a V-shaped equal slope model, a straight line equal slope model, a V-shaped unequal slope model and a straight line unequal slope model.

[0021] Furthermore, the straight line equal slope model is used for the contact network layout at both ends of the station; the V-shaped unequal slope model and the straight line unequal slope model are used for the contact network layout within the range of turnouts and civil air defense doors, and the V-shaped equal slope model is used for the contact network layout at both ends of the station, turnouts and locations other than civil air defense doors.

[0022] Furthermore, the change rate of the pull-out value of the contact network is 2-5 mm / m.

[0023] Furthermore, in step 3, the steps for calculating the contact network length are:

[0024] Step 3.1, input the line plane data into the database, establish a coordinate system, map the line center into a straight line, define the starting point of the route as the origin, the x-coordinate represents the mileage, the y-coordinate represents the contact network pull-out value, and use a function to express each contact network anchor section;

[0025] Step 3.2, calculate the contact network length corresponding to each pull-out value interval of the rigid contact network and the flexible contact network.

[0026] Furthermore, in step 2, the traction simulation calculation of the train is completed to obtain the traction current value of the train;

[0027] In step 3, the calculation formula of the wear contribution value αi is:

[0028] αi=∑ 1≤m≤n Pm;

[0029] Pm=Mm+Em;

[0030] Em=γ×Lm;

[0031] Mm = β × Lm;

[0032] Pm-wear contribution value within the i-th pull-out value interval;

[0033] β-Mechanical wear coefficient of the contact network per unit length on the pantograph slider, distinguishing between rigid contact network and flexible contact network. The mechanical wear coefficient of the rigid contact network is β1; the mechanical wear coefficient of the flexible contact network is β2;

[0034] γ-electrical wear coefficient of the contact network per unit length on the pantograph slider;

[0035] Lm-the length of the continuous overhead line in the mth section;

[0036] Mm-the mechanical wear contribution of the mth section of continuous overhead contact network to the pantograph slider;

[0037] Em-contribution value of electrical wear of the pantograph slider caused by the continuous catenary of the mth section;

[0038] Pm-the total wear contribution of the mth section of continuous overhead contact network to the pantograph slider;

[0039] n – total number of continuous contact network sections.

[0040] Furthermore, in step 4, all αi data are extracted to generate a preliminary wear scar curve and normalize it so that the preliminary wear scar curve satisfies the following formula:

[0041] ymax = GH;

[0042] ymax-maximum value of wear after normalization;

[0043] H- minimum allowable residual height of pantograph slider;

[0044] G- Initial height of pantograph slider.

[0045] Furthermore, in step 4, the preliminary wear mark curve is fitted in combination with the amplitude and frequency curve of the vehicle to obtain the expected wear mark curve.

[0046] This solution also has the following effects:

[0047] 1. In the prior art, the world coordinate system is usually used, the route centerline is represented by a function, and the pull-out value is represented by directly calculating the distance from the contact network to the centerline;

[0048] However, since this scheme needs to divide the calculation into multiple pull-out value intervals, it is necessary to obtain the pull-out values ​​of multiple positions of the contact network. The traditional method of obtaining data is computationally intensive and inefficient. Therefore, this scheme divides the contact network into flexible contact network and rigid contact network for calculation. Since the straight section of the flexible contact network and the linear shape of the rigid contact network are relatively simple, the center line of the route (including the curved part) is simplified to the X-axis, so that the x-coordinate is equal to the mileage of the route, so that the y-coordinate is the pull-out value, and the coordinates and the characteristic values ​​of the contact network are corresponded one by one to facilitate the subsequent extraction of relevant data. For the curved section of the flexible contact network, although each suspension point needs to change direction and the linear shape is complex, the mileage of the flexible contact network is usually small, so the existing world coordinate system can be directly used for calculation.

[0049] 2. In step 2.1, different layout models are used according to different sections. Models with more slope changes are suitable for locations with more uncertain factors. For rigid contact networks, a V-shaped equal slope model is used. If the deviation of the first calculation result is large, the number of slope changes is appropriately increased in the subsequent calculations, so as to gradually adjust the contact network layout and make the expected wear scar curve closer and closer to the ideal wear scar curve.

[0050] 3. The change speed of the contact network pull-out value is controlled within the range of 2-5mm / m to ensure the safety and stability of track operation. The change speed of the contact network pull-out value indicates: the change in the pull-out value for every additional meter of mileage.

[0051] 4. This scheme introduces the concept of wear contribution value, that is, the mechanical wear coefficient and electrical wear coefficient obtained through experiments and practice to calculate the total wear contribution value. The mechanical wear coefficient is the mechanical wear of the contact network on the pantograph slider per unit length (1m), and the electrical wear coefficient is the electrical wear of the contact network on the pantograph slider per unit length (1m). The wear contribution value represents the relative wear evaluation factor of different pull-out value ranges on the slider, not the specific wear depth.

[0052] 5. According to the wear contribution value of each pull-out value interval, generate a preliminary wear scar curve and scale it proportionally so that the maximum wear depth of the preliminary wear scar curve is equal to the effective wear height h of the ideal wear scar curve. The scaled preliminary wear scar curve can be used to estimate the specific wear depth on the slider;

[0053] After fitting the preliminary wear scar curve, the predicted wear scar curve and the ideal wear scar curve are compared. The larger the deviation value, the more uneven the wear of the predicted wear scar curve and the higher the cost of the slider. Therefore, the contact network needs to be adjusted and recalculated. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is the overall flow chart of the embodiment;

[0055] Figure 2 is the ideal wear scar curve of the embodiment;

[0056] Figure 3 It is the V-shaped equal slope model of the embodiment;

[0057] Figure 4 A straight line equal slope model for an embodiment;

[0058] Figure 5 The V-shaped unequal slope model of the embodiment;

[0059] Figure 6 , which is a straight line unequal slope model of an embodiment. DETAILED DESCRIPTION

[0060] The following is further described in detail through specific implementation methods:

[0061] The reference numerals in the drawings of the specification include: ideal wear scar curve L1, contact network 1, pantograph center line 2, slider 3.

[0062] Example

[0063] A method for designing the contact network layout based on the ideal wear mark of the pantograph slider. The overall flow chart is as follows: Figure 1 As shown, the following steps are included:

[0064] Step 1, design an ideal wear scar curve L1 of the pantograph slider 3, which represents the ideal shape of the upper surface of the slider 3 after wear; Figure 2 As shown, the middle section of the ideal wear scar curve L1 is straight, the end section of the ideal wear scar curve L1 is higher than the middle section, and a transition curve is provided between the end section and the middle section; the calculation formula of the effective wear height h of the ideal wear scar curve L1 is:

[0065] h = GH;

[0066] G- the original height of the pantograph slider 3;

[0067] H-the minimum allowable excess height of the pantograph slider 3, which is the minimum thickness to ensure safe operation of the train;

[0068] Step 2.1, input the line, vehicle, and driving related parameters into the database, complete the traction simulation calculation of the train according to the relevant parameters, obtain the designed traction current value of the train, and import the simulation results into the database;

[0069] Divide the anchor section of the contact network 1, and design the contact network 1 into flexible contact network and rigid contact network respectively. Flexible contact network and rigid contact network are two existing contact network types suitable for different environments. First, carry out the plane layout design of the flexible contact network according to the design specifications: when designing, the maximum pull-out value should be used as much as possible for the straight segment, and the pull-out value design of the curved segment must ensure that the contact line and the curve are intersecting under the condition of meeting the wind deviation;

[0070] Then the rigid contact network plane layout design is carried out. Since the line shape of the rigid contact network is simpler and less variable than that of the flexible contact network, the corresponding simplified layout model is selected for the rigid contact network of different anchor sections. The layout model includes the following: Figure 3 The V-shaped equal slope model shown in Figure 4 The straight line equal slope model shown in Figure 5 The V-shaped unequal slope model shown and Figure 6 The straight lines with unequal slopes model shown; Figure 3-Figure 6In the figure, the dotted line in the middle indicates the position of the pantograph centerline 2 (which is also the centerline of the route), and the bold solid line indicates the overhead contact network 1. The difference between the four layout models lies in the number of key points and the direction of the line segment inclination. k represents the slope of the line segment, and the specific value of the slope is determined according to the pull-out value, the route and the length of the anchor segment. The straight line equal slope model is used for the layout of the overhead contact network 1 at both ends of the station entrance and exit; the V-shaped unequal slope model and the straight line unequal slope model are used for the layout of the overhead contact network 1 of the turnout and the civil air defense door; the layout model of the remaining positions of the rigid overhead contact network selects the V-shaped equal slope model; in principle, the higher the adjustment frequency of the plane layout, the more times the slope changes on the model; the change rate of the pull-out value of the overhead contact network 1 is 2-5mm / m, thereby ensuring the safety and stability of the track operation;

[0071] Finally, confirm the mileage and pull-out value of each anchor point, and enter the relevant data of the contact network 1 into the database. The relevant data include the mileage of each straight-slow point, slow-round point, round-slow point, slow-straight point, curve radius and various design elements of the line in the world coordinate system; also include the mileage and pull-out value information of each suspension point of the flexible contact network; also include the starting and ending mileage of each anchor section of the rigid contact network, and the pull-out value information at each slope change point; also include the data of vehicle amplitude and frequency, and enter the station section information;

[0072] Step 2.2, establish a coordinate system, define the starting point of the route as the origin, the x-coordinate represents the mileage (that is, the center line of the route is regarded as a straight line in an ideal two-dimensional plane, and the straight line is defined as the x-axis of this coordinate system), the y-coordinate represents the pull-out value of the contact network 1 (that is, the straight line passing through the mileage of K0+000.000 and perpendicular to the X-axis is the Y-axis), and a function is used to express the contact network 1 of each anchor section;

[0073] Step 2.3: Figure 3 As shown, the dotted lines on the upper and lower sides indicate the position of the maximum pull-out value. According to the pull-out value range corresponding to the position on the slider 3, it can be divided into multiple pull-out value intervals (using a computer can divide more intervals, thereby increasing the accuracy of the calculation). The area between the two dotted lines indicates all the pull-out value intervals, and the area within the broken line box indicates one of the pull-out value intervals; the length of the contact network 1 corresponding to each pull-out value interval of the straight section of the rigid contact network and the flexible contact network is calculated respectively;

[0074] Step 3: Calculate the wear contribution value of each pull-out value interval in each anchor section and on the slider 3 in turn according to the mileage. When all anchor sections within the mileage range are calculated, the calculation is completed. The calculation formula for the total wear contribution value αi of the i-th pull-out value interval is:

[0075] αi=∑ 1≤m≤n Pm;

[0076] Pm=Mm+Em;

[0077] Em=γ×Lm;

[0078] Mm = β × Lm;

[0079] Pm-wear contribution value within the i-th pull-out value interval;

[0080] β-Mechanical wear coefficient of the contact network per unit length on the pantograph slider, distinguishing between rigid contact network and flexible contact network. The mechanical wear coefficient of the rigid contact network is β1; the mechanical wear coefficient of the flexible contact network is β2;

[0081] γ-electrical wear coefficient of the contact network per unit length on the pantograph slider;

[0082] Lm-the length of the continuous overhead line in the mth section;

[0083] Mm-the mechanical wear contribution of the mth section of continuous overhead contact network to the pantograph slider;

[0084] Em-contribution value of electrical wear of the pantograph slider caused by the continuous catenary of the mth section;

[0085] Pm-the total wear contribution of the mth section of continuous overhead contact network to the pantograph slider;

[0086] n-total number of continuous contact network sections;

[0087] In each pull-out value interval, there are several continuous straight line segments. The sum of the parameters of these straight line segments is the total parameter value of the pull-out value interval;

[0088] Step 4: Calculate and draw the expected wear scar curve L3 according to the wear contribution value; specifically, extract all αi data, generate the preliminary wear scar curve L2 and perform normalization processing so that the preliminary wear scar curve L2 satisfies the following formula:

[0089] ymax = GH;

[0090] ymax-maximum value of wear after normalization;

[0091] H- minimum allowable residual height of pantograph slider;

[0092] G- Initial height of pantograph slider.

[0093] Combined with the amplitude and frequency curves of the vehicle, the preliminary wear scar curve L2 is fitted to obtain the estimated wear scar curve L3;

[0094] Step 5. Benchmark the expected wear mark curve L3 and the ideal wear mark curve L1 to obtain the design deviation value. When the design deviation value is greater than the expected deviation value, adjust the layout of the contact network 1 and repeat steps 2-5; when the design deviation value is less than the expected deviation value, complete the layout of the contact network 1. The design deviation value and the expected deviation value can be represented by parameters representing the discrete coefficient. In this embodiment, the variance is used. If the design deviation value does not meet the expected value, calculate which intervals have deviations exceeding expectations, and then find a more efficient adjustment method to adjust the original plane layout. After the adjustment is completed, update the database, and then re-perform the simulation calculation of the entire line; if the design deviation value meets expectations, the pull-out value layout design of the entire line is completed. At this time, the pull-out value layout design is in a state where the flexible contact network completes the plane layout and the rigid contact network completes the anchor section design.

[0095] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider, characterized in that: The following steps are involved: Step 1: Design an ideal wear curve of the pantograph slider; Step 2: Conduct preliminary contact network layout design to obtain contact network pull-out value; Step 3, calculate the length of each section of the contact network in sequence according to the pull-out value interval and mileage order, and calculate the wear contribution value of the corresponding length of the contact network to the pantograph slider; Step 4: Calculate and draw the expected wear scar curve according to the wear contribution value; Step 5. Compare the expected wear mark curve with the ideal wear mark curve to obtain the design deviation value. When the design deviation value is greater than the expected deviation value, adjust the contact network layout and repeat steps 2 to 5. When the design deviation value is less than the expected deviation value, complete the contact network layout.

2. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 1 is characterized by: The middle section of the ideal wear scar curve is straight, the end section of the ideal wear scar curve is higher than the middle section, and a transition curve is provided between the end section and the middle section.

3. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 2 is characterized in that: In step 2, the specific steps of performing preliminary contact network plane layout design are: first completing the plane layout design of the flexible contact network, and then completing the plane layout design of the rigid contact network; The plan layout design method of the rigid contact network is: divide the contact network into anchor sections, select corresponding layout models for different anchor sections, confirm the mileage and pull-out value of each control point, and input the plan layout data of the contact network into the database.

4. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 3 is characterized by: In step 2, the arrangement models include a V-shaped equal slope model, a straight line equal slope model, a V-shaped unequal slope model, and a straight line unequal slope model.

5. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 4 is characterized by: The straight line equal slope model is used for the contact network layout at both ends of the station; the V-shaped unequal slope model and the straight line unequal slope model are used for the contact network layout within the range of turnouts and civil air defense doors; the V-shaped equal slope model is used for the contact network layout at both ends of the station, turnouts and locations other than civil air defense doors.

6. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 5, characterized in that: The change rate of the contact network pull-out value is 2-5mm / m.

7. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 6, characterized in that: In step 2 and step 3, the steps for calculating the contact network length are: Step 3.1, input the line plane data into the database, establish a coordinate system, map the line center into a straight line, define the starting point of the route as the origin, the x-coordinate represents the mileage, the y-coordinate represents the contact network pull-out value, and use a function to express each contact network anchor section; Step 3.2, calculate the contact network length corresponding to each pull-out value interval of the rigid contact network and the flexible contact network.

8. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 7 is characterized in that: In step 2, the traction simulation calculation of the train is completed to obtain the traction current value of the train; In step 3, the calculation formula for the total wear contribution value αi of the i-th pull-out value interval is: αi=∑ 1≤m≤n Pm; Pm=Mm+Em; Em=γ×Lm; Mm = β × Lm; Pm-wear contribution value within the i-th pull-out value interval; β-Mechanical wear coefficient of the contact network per unit length on the pantograph slider, distinguishing between rigid contact network and flexible contact network. The mechanical wear coefficient of the rigid contact network is β1; the mechanical wear coefficient of the flexible contact network is β2; γ-electrical wear coefficient of the contact network per unit length on the pantograph slider; Lm-length of the continuous overhead line in the mth section; Mm-the mechanical wear contribution of the mth section of continuous overhead contact network to the pantograph slider; Em-contribution value of electrical wear of the pantograph slider caused by the continuous catenary of the mth section; Pm-the total wear contribution of the mth section of continuous overhead contact network to the pantograph slider; n – total number of continuous contact network sections.

9. The method for designing the contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 8, characterized in that: In step 4, all αi data are extracted to generate a preliminary wear scar curve and normalize it so that the preliminary wear scar curve satisfies the following formula: ymax = GH; ymax-maximum value of wear after normalization; H- minimum allowable residual height of pantograph slider; G- Initial height of pantograph slider.

10. The method for designing overhead contact network plane layout based on the ideal wear mark of the pantograph slider according to claim 9, characterized in that: In step 4, the preliminary wear scar curve is fitted in combination with the amplitude and frequency curve of the vehicle to obtain the expected wear scar curve.

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