CN110929432B - Double-pantograph interval determination method for improving current collection quality of double pantograph of high-speed railway - Google Patents
Double-pantograph interval determination method for improving current collection quality of double pantograph of high-speed railway Download PDFInfo
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Abstract
The invention discloses a double-pantograph spacing determination method for improving the double-pantograph current collection quality of a high-speed railway. Therefore, in the design process of the contact network, parameters of the contact network are designed, so that the distance between the pantograph of the existing motor train unit is close to the favorable distance between the double bows at the design speed per hour, and the current collection quality of the double bows of the high-speed rail is improved. The method makes up the defects of the traditional design method, and can improve the accuracy and safety of subsequent engineering design.
Description
Technical Field
The invention relates to the technical field of electrified railway contact networks and dynamic current collection characteristics thereof, in particular to a double-pantograph spacing determination method for improving the current collection quality of double pantographs of a high-speed railway.
Background
In order to increase the load carrying capacity of high speed trains, two motor trains are usually coupled to some existing high speed railway lines, in which case the high speed trains are operated with double pantograph concurrent current collection, double pantograph operation brings completely new challenges to the high speed railway technology, one of which is that vibration waves generated On contact lines during operation of front pantograph act On rear pantograph, which leads to reduction of rear pantograph current collection quality, the article On 1077 th volume of 54 th volume of 2016 of Vehicle System Dynamics, Zohong Liu, Per-Anders J ö nsson, Sebastin Stichel and Anderss R ø nnquist article of Japan, which is not considered to have a significant impact On the high speed railway current collection On the characteristics of double pantograph current collection, which leads to a significant influence On the high speed railway current characteristics of railway current collection.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a double-pantograph gap determining method for improving the current collection quality of double pantographs of a high-speed railway based on a fluctuation propagation law. The technical scheme is as follows:
a double-pantograph spacing determination method for improving the current collection quality of double pantographs of a high-speed railway comprises the following steps:
step 1: adopting a contact net model based on finite element theory to carry out constant force and fixed speedvPerforming numerical simulation calculation on the swept contact line to obtain the dynamic response of the contact line at the midspan position of the contact line system, outputting the vertical displacement time course and the vertical speed time course of the contact line, and performing filtering at 0-5 Hz;
step 2: the dynamic response of the midspan contact line is segmented by taking the vertical speed change of the contact line as a standard, and the dynamic response is divided into three segments: before excitation, after excitation neutralization and excitation; before the excitation, the contact line starts from rest to receive the excitation, and the vertical speed is increased from 0 to the peak value; the excitation is a section in which the contact line is acted by the excitation force, and the vertical speed is reduced from a peak value to a valley value; the excited section is a section in which the contact line vibrates and the vertical speed is in periodic change;
and step 3: obtaining the length of the action section of the excitation sweep according to the segmentationL cAnd the natural frequency of vertical vibration of the contact line after excitationf c；
And 4, step 4: the running speed of the train is calculated by the following formulavAnd (3) the beneficial and adverse distances of the double pantograph on the influence of the double pantograph current collection quality:
wherein,L pthe distance between the two pantographs is set as,L c in order to excite the sweep action zone length,f cthe contact line vertical vibration natural frequency after excitation; k is a natural number starting from 1;
and 5: and (4) screening the results obtained in the step (4) according to the provisions of railway standards to determine the beneficial distance between the double arches.
The invention has the beneficial effects that: under the condition that the double pantographs of the high-speed railway operate, on the basis of a contact line fluctuation propagation rule and a resonance and vibration elimination mechanism, a calculation formula of the favorable interval and the unfavorable interval of the double pantographs is provided, so that in the design process of a contact network, parameters of the contact network are designed, the distance between the pantographs of the existing motor train unit is close to the favorable interval of the double pantographs at the design hourly speed, the current collection quality of the double pantographs of the high-speed railway is improved, and the dynamic performance of the double pantographs of the high-speed railway is improved; the defects of the traditional design method are overcome, and the accuracy and the safety of subsequent engineering design can be improved.
Drawings
Fig. 1 is a schematic diagram of a high-speed railway double pantograph-catenary system.
FIG. 2 is a graph of standard deviation results of posterior arch contact pressure at different speeds and double arch spacing.
Fig. 3 is a plot of vertical velocity of a contact line across the center of the contact network under constant force sweep.
FIG. 4 is a comparison graph of standard deviation of contact pressure of the rear bow of the Jingjin intercity railway at different double-bow distances at the running speed of 350km/h and the calculated favorable distance.
Fig. 5 is a schematic diagram showing the fluctuation of the contact point of the anterior arch and the fluctuation of the contact point of the posterior arch at different positions in the conventional method 1. Wherein the vertical axis is the vertical displacement of the contact point, and the horizontal axis is the pantograph operating mileage.
FIG. 6 is a comparison graph of standard deviation of contact pressure of rear arches at different double-arch intervals of the Jingjin intercity railway at the running speed of 350km/h and the favorable interval calculated by the prior art.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments. The invention discloses a double-pantograph spacing determining method for improving the double-pantograph current collection quality of a high-speed railway based on a fluctuation propagation rule. The method comprises the following steps:
A. adopting a contact net model based on finite element theory to carry out constant force and fixed speedvNumerical simulation calculation of swept contact linesAnd obtaining the dynamic response of the contact line at the midspan position of the contact line, outputting the vertical displacement time course and the vertical speed time course of the contact line, and filtering by 0-5 Hz.
B. The dynamic response of the midspan contact line is segmented by taking the vertical speed change of the contact line as a standard, and the dynamic response is divided into three segments: before excitation, during excitation and after excitation. Wherein the contact line receives an excitation from rest before excitation, as indicated by a vertical velocity increase from 0 to a peak. The contact line at that location in the excitation is subjected to the excitation force, which manifests as a rapid decrease in vertical velocity from a peak to a valley. After excitation, the contact line vibrates, and the vertical velocity shows periodic variation from peak value to valley value.
C. Segmenting according to the step B and obtaining the length of the action section of the excitation sweepL cAnd the natural frequency of vertical vibration of the contact line after excitationf c。
D. According to the principles of resonance and vibration elimination, when the distance between the two arches enables the vertical speed peak value (the starting position in excitation) of the contact line caused by the rear arch to correspond to the peak value (the peak position after excitation) caused by the front arch, the resonance of the contact line can be judged, and the stable current collection of the two arches is not facilitated; otherwise, vibration is eliminated, and stable current collection of the double bows is facilitated. The running speed of the train is calculated by the following formulavAnd (3) the beneficial and adverse distances of the double pantograph on the influence of the double pantograph current collection quality:
whereinL pThe distance between the two pantographs is set as,L c in order to excite the sweep action zone length,f cthe contact line vertical vibration natural frequency after excitation; k is a natural number starting from 1.
E. And D, according to the standard TB/T3271-2011 interaction rule of the pantograph and the overhead contact system of the rail transit current collection system, the distance between two pantographs working in a train is 200m to 215m or the maximum distance is 400 m, and the distance is compared with the result obtained in the step D to determine the beneficial distance between the double pantographs.
In the embodiment of the invention, the beneficial distance of the double bows for improving the current collection performance of the rear bow is calculated by adopting the method provided by the invention by taking the design of the Jingjin intercity railway contact network with the train running speed of 350Km/h and the French LeNX pantograph as an example.
A high-speed railway double pantograph-catenary system is shown in figure 1, numerical simulation is carried out by adopting a contact network model based on a finite element theory to obtain double pantograph contact pressures at different speeds and different double pantograph intervals, and standard deviation of the later pantograph contact pressures
As an evaluation index of the double-arch-net system current collection quality, the rule of the influence of the double-arch distance on the double-arch current collection quality at different speeds is obtained, as shown in fig. 2. It can be seen that the standard deviation of the contact pressure of the rear bow at different speeds
There is a periodic relationship between the size and the distance between the two arches. A vertical velocity time course curve across the mid-contact line is then obtained, per step A, B. By taking the vertical velocity change of the contact line as a standard, the dynamic response of the midspan contact line can be clearly divided into three sections: before excitation, after excitation neutralization excitation, and obtaining the length of the excitation sweep action sectionL cAnd the natural frequency of vertical vibration of the contact line after excitationf c，As shown in fig. 3.
And D, calculating the favorable double-bow distance of the Jingjin intercity railway at the running speed of 350km/h of the train according to the formula provided in the step D, and comparing the favorable double-bow distance with the simulation result, wherein the favorable double-bow distance is shown in the figure 4. Wherein the broken line is the standard deviation of the contact pressure of the rear arch under different double-arch intervals
And the vertical dotted line is the calculation result of the method. Meanwhile, the comparison is made with conventional method 1 (from the literature, "Pantograph and cathode systems with double primers for high-speed trains at 350km/h organ") and method 2 (from the "On the implementation of an automatic company for speed in creating experiments On existing lines"). Method 1 is considered asFluctuation of contact point of rear bowL gWith positive spacing when the contact point of the front bow fluctuates in opposite phase to that of the rear bowL bIn phase with the anterior arch contact point fluctuation is an unfavorable spacing, as shown in fig. 5. Therefore, the formula is proposed:
method 2 considers that the rear arch is at the trough position of the contact line vibration caused by the front arch, namely the favorable spacing is obtained, and the proposed favorable spacing formula is as follows:
the results of the formula calculations proposed in methods 1 and 2 are compared with the simulation results, as shown in fig. 6. With reference to FIGS. 4 and 6, it can be seen that the present method innovatively proposes a method for segmenting the dynamic response zone of a contact line as indicated by the vertical velocity of the contact line and for sweeping the excitation sweep for the active zone length, as compared to the previous methodL cThe current collection characteristic of the double-arch network system is accurately reflected by introducing a double-arch distance calculation formula.
Claims (1)
1. A double-pantograph spacing determination method for improving the current collection quality of double pantographs of a high-speed railway is characterized by comprising the following steps of:
step 1: adopting a contact net model based on finite element theory to carry out constant force and fixed speedvPerforming numerical simulation calculation on the swept contact line to obtain the dynamic response of the contact line at the midspan position of the contact line system, outputting the vertical displacement time course and the vertical speed time course of the contact line, and performing filtering at 0-5 Hz;
step 2: the dynamic response of the midspan contact line is segmented by taking the vertical speed change of the contact line as a standard, and the dynamic response is divided into three segments: before excitation, after excitation neutralization and excitation; before the excitation, the contact line starts from rest to receive the excitation, and the vertical speed is increased from 0 to the peak value; the excitation is a section in which the contact line is acted by the excitation force, and the vertical speed is reduced from a peak value to a valley value; the excited section is a section in which the contact line vibrates and the vertical speed is in periodic change;
and step 3: obtaining the length of the action section of the excitation sweep according to the segmentationL cAnd the natural frequency of vertical vibration of the contact line after excitationf c；
And 4, step 4: the running speed of the train is calculated by the following formulavAnd (3) the beneficial and adverse distances of the double pantograph on the influence of the double pantograph current collection quality:
wherein,L pthe distance between the two pantographs is set as,L c in order to excite the sweep action zone length,f cthe contact line vertical vibration natural frequency after excitation; k is a natural number starting from 1;
and 5: and (4) screening the results obtained in the step (4) according to the provisions of railway standards to determine the beneficial distance between the double arches.
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