CN110887653A - Contact net state detection method and contact net positioner system - Google Patents
Contact net state detection method and contact net positioner system Download PDFInfo
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Abstract
The application provides a contact network state detection method and a contact network locator system, which comprises the steps of collecting vibration signals of each contact network locator at the current moment in a plurality of sampling sections in the current area respectively based on preset sampling frequency, and obtaining the vibration signals of the contact network locators in each sampling section. And performing data processing on the vibration signals in each sampling section, and determining a corresponding frequency point when the power spectrum of each sampling section is maximum based on a preset theoretical vibration fundamental frequency to obtain the vibration fundamental frequency of each contact net positioner. Dividing the vibration fundamental frequency of each contact net positioner in the current area into a plurality of groups of vibration fundamental frequencies according to a first preset rule, and determining the median of each group of vibration fundamental frequencies. Whether ice condensation states occur in all contact net locators in the current area is determined based on the median of the current group of vibration fundamental frequencies and the median of the previous group of vibration fundamental frequencies, and whether ice condensation states occur in the current area is determined based on the number of the contact net locators with the ice condensation states.
Description
Technical Field
The application relates to the technical field of railway contact networks, in particular to a contact network state detection method and a contact network locator system.
Background
The contact network is an important way for providing power for the electric locomotive by a traction power supply system, plays an important role in the electrified railway, and has a vital significance for ensuring the safety of the working state of the contact network in railway transportation. At present, the contact net and the power supply equipment of the domestic electrified railway are mostly detected by equipment which is installed on an operation vehicle or is operated manually. Various parameter changes of the contact net are common reasons causing contact net faults, and bow net accidents can be caused in serious cases.
The existing online monitoring device for the contact network is generally used as a temporary online monitoring device, has no fixed power supply, has limited data transmission distance, has no connection between a corresponding data network and a station dispatching center, and has low practicability; and the on-vehicle check out test set of contact net generally installs on special vehicles such as contact net detection car, though can realize the detection of whole line contact net, its detection interval time is long, needs special "skylight" activity duration. And manual detection does not need to have a power failure operation alone, but detection efficiency is lower, also can receive the driving influence, consequently lacks the real-time assurance to operating condition under the various operating modes of contact net.
Aiming at the working state of the overhead line system, the existing detection method has the defects of low detection efficiency and poor reliability.
Disclosure of Invention
Therefore, the method for detecting the state of the overhead line system and the overhead line system positioner system are needed to be provided aiming at the working state of the overhead line system, and the problems of low detection efficiency and poor reliability of the existing detection method exist.
A contact network state detection method is applied to a contact network locator system, and comprises the following steps:
respectively acquiring vibration signals of each overhead line system locator at the current moment in a plurality of sampling sections in the current area based on preset sampling frequency to obtain vibration signals x of the overhead line system locators in each sampling sectionm,k(t), m is a natural number, k is an integer;
the vibration signal x in each sampling section is measuredm,k(t) processing the data to obtain a power spectrum P of each sampling sectionm,k(f) And determining the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,k；
Dividing the vibration fundamental frequency of each overhead contact system locator in the current area into a plurality of groups of vibration fundamental frequencies according to a first preset rule, and determining the median f of each group of vibration fundamental frequenciesm,n；
And determining whether the ice condensation state occurs in each overhead line system locator in the current area based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group, and determining whether the ice condensation state occurs in the current area based on the number of the overhead line system locators in the ice condensation state.
In one embodiment, vibration signals of each overhead line system locator at the current moment are acquired in a plurality of sampling sections in the current area respectively based on preset sampling frequency, and vibration signals x of the overhead line system locator in each sampling section are obtainedm,kThe step of (t) comprises:
determining a preset theoretical fundamental vibration frequency f of each catenary positioner in a plurality of sampling sections in the current aream,0；
Acquiring vibration signals of the contact net positioner in each sampling section at the current moment based on preset sampling frequency to obtain vibration signals x of the contact net positioner in each sampling sectionm,k(t)。
In one embodiment, the vibration signal of the overhead line system locator in each sampling section at the current moment is acquired based on a preset sampling frequency, and the vibration signal of the overhead line system locator in each sampling section is xm,kThe step of (t) comprises:
acquiring vibration signals of each overhead line system locator in each sampling section at the current moment through a wireless acceleration sensor or a strain sensor based on preset sampling frequency to obtain that the vibration signal of the overhead line system locator in each sampling section is xm,k(t)。
In one embodiment, vibration signals of each overhead line system locator at the current moment are acquired in a plurality of sampling sections in the current area respectively based on preset sampling frequency to obtain each sampling sectionVibration signal x of contact net positionerm,k(t) prior to the step of, the method further comprising:
dividing a plurality of contact net positioners in the current area into a plurality of sampling sections according to a second preset rule, wherein each sampling section comprises a plurality of contact net positioners, and each sampling section comprises the same number of contact net positioners.
In one embodiment, the vibration signal x in each of the sampling segments is divided into two or more sectionsm,k(t) processing the data to obtain a power spectrum P of each sampling sectionm,k(f) And determining the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,kComprises the following steps:
the vibration signal x in each sampling section is measuredm,k(t) processing the data according to Fourier transform to obtain a power spectrum P of each sampling segmentm,k(f)；
Determining the power spectrum P of each sampling section based on a preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,k。
In one embodiment, the determination of the power spectrum P of each of the sampling segments based on the preset theoretical fundamental vibration frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,kComprises the following steps:
determining the power spectrum P of each sampling section in a set range based on a preset theoretical vibration fundamental frequencym,k(f) The maximum corresponding frequency point is obtained, and the vibration fundamental frequency of each contact net positioner is fm,kThe setting ranges are as follows:
[(1-ε)fm,k-1,(1+ε)fm,k-1]
wherein epsilon is a frequency search parameter, and the numerical range of epsilon is 0.2-0.4; f. ofm,k-1Representing the vibration base of the mth contact net positioner in the kth-1 sampling sectionFrequency.
In one embodiment, the step of determining whether the ice condensation state occurs in each overhead line system locator in the current area based on the median of the current set of fundamental vibration frequencies and the median of the previous set of fundamental vibration frequencies, and the step of determining whether the ice condensation state occurs in the current area based on the number of overhead line system locators in which the ice condensation state occurs comprises:
comparing difference values based on the median of the current group of the vibration fundamental frequencies and the median of the previous group of the vibration fundamental frequencies to obtain a difference value comparison result;
if the difference comparison result is greater than a preset threshold value, determining that ice is condensed on the current overhead line system locator, and if the difference comparison result is less than or equal to the preset threshold value, determining that ice is not condensed on the current overhead line system locator;
and determining whether the ice condensation state occurs in the current area or not based on the number of the catenary locators with the ice condensation state.
In one embodiment, the step of comparing the difference based on the median of the fundamental vibration frequencies of the current group and the median of the fundamental vibration frequencies of the previous group to obtain the difference comparison result comprises:
and comparing difference values based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group to obtain a difference value comparison result, wherein the formula is as follows:
wherein h is the difference comparison result, δ is a freezing prediction parameter, δ has a numerical range of 0.1-0.2, and n is an integer greater than 2.
In one embodiment, the step of determining whether the ice condensation state occurs in the current area based on the number of catenary locators with the ice condensation state comprises:
comparing the number of the catenary locators with the ice condensation state with a set number threshold;
if the number of the catenary locators with the ice condensation state is larger than the set number threshold, determining that the ice condensation occurs in the current area;
and if the number of the catenary locators with the ice condensation state is smaller than or equal to the set number threshold, determining that no ice condensation occurs in the current area.
A catenary locator system, comprising:
data processing equipment for executing the steps of the contact network state detection method according to any one of the above embodiments.
Compared with the prior art, the contact network state detection method and the contact network locator system acquire the vibration signal of each contact network locator at the current moment in a plurality of sampling sections in the current area respectively based on the preset sampling frequency to obtain the vibration signal of each contact network locator in each sampling section; then, carrying out data processing on the vibration signals in each sampling section, and determining a frequency point corresponding to the maximum power spectrum of each sampling section based on a preset theoretical vibration fundamental frequency to obtain the vibration fundamental frequency of each overhead line system locator; dividing the vibration fundamental frequency of each overhead contact system locator in the current area into a plurality of groups of vibration fundamental frequencies according to a first preset rule, and determining the median of each group of vibration fundamental frequencies; and determining whether the ice condensation state occurs in each overhead line system locator in the current area based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group, and determining whether the ice condensation state occurs in the current area based on the number of the overhead line system locators in the ice condensation state. By the adoption of the method, whether the contact net positioner system is in the ice condensation state or not can be accurately detected, manual detection can be avoided, and detection efficiency and detection reliability are improved.
Drawings
Fig. 1 is a flowchart of a method for detecting a state of a contact network according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a contact line locator system provided in an embodiment of the present application.
10 contact net locator system
110 data processing device
120 sensor
130 data collector
140 data transmission network
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a method for detecting a state of a catenary, which is applied to a catenary positioner system, and the method for detecting the state of the catenary can be used for detecting the state of the catenary in real time. The method comprises the following steps:
s102: respectively acquiring vibration signals of each overhead line system locator at the current moment in a plurality of sampling sections in the current area based on preset sampling frequency to obtain the vibration of the overhead line system locator in each sampling sectionMoving signal xm,k(t), m is a natural number, and k is an integer.
In one embodiment, the processor or the controller may acquire the vibration signal of each overhead line system locator at the current time in a plurality of sampling sections in the current area based on a preset sampling frequency, respectively, to obtain the vibration signal x of the overhead line system locator in each sampling sectionm,k(t) of (d). Specifically, the processor or the controller can acquire the vibration signal of each overhead line system locator at the current moment through the acceleration sensor or the strain sensor based on the preset sampling frequency, and obtain the vibration signal x of each overhead line system locator in each sampling sectionm,k(t)。
In one embodiment, the preset sampling frequency may be set according to actual requirements, for example, the preset sampling frequency may be 20Hz to 50 Hz. In one embodiment, the xm,k(t) represents the vibration signal of the mth overhead line system locator in the kth sampling section at the time t. In one embodiment, each of the sampling sections may comprise a plurality of the catenary locators. I.e. each of said sampling segments may comprise a plurality of sampling points. In one embodiment, the current area may include a plurality of the sampling sections, and the number of catenary locators in each of the sampling sections is the same.
S104: the vibration signal x in each sampling section is measuredm,k(t) processing the data to obtain a power spectrum P of each sampling sectionm,k(f) And determining the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,k。
In one embodiment, the vibration signal x in each of the sampling segments may be processed by the processor or controllerm,k(t) processing the data to obtain a power spectrum P of each sampling sectionm,k(f) And determining the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,k. Specifically, the processor or the controller obtains a vibration signal x of the overhead line system positioner in each sampling sectionm,kAfter (t), the data processing can be carried out on each vibration signal according to Fourier transform, and the power spectrum P of each sampling section is obtainedm,k(f)。
In one embodiment, the power spectrum P of each of the sampling segments is determined based on a preset theoretical fundamental vibration frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,kThe method comprises the following steps: corresponding the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Finding the power spectrum P within a set rangem,k(f) The frequency point when the maximum is reached can obtain the vibration fundamental frequency f of the current contact net positionerm,k。
In one embodiment, the setting range refers to:
[(1-ε)fm,k-1,(1+ε)fm,k-1]
wherein, epsilon is a frequency search parameter, and the specific numerical range of epsilon can be set according to actual requirements, for example: can be set to 0.2-0.4; f. ofm,k-1And representing the vibration fundamental frequency of the mth overhead line system locator in the kth-1 sampling section.
S106: dividing the vibration fundamental frequency of each overhead contact system locator in the current area into a plurality of groups of vibration fundamental frequencies according to a first preset rule, and determining the median of each group of vibration fundamental frequencies
In one embodiment, the first preset rule is: the vibration fundamental frequencies of 100 consecutive overhead line locator in the current area can be divided into a group of vibration fundamental frequencies. The vibration fundamental frequencies of 200 continuous overhead line system locators in the current area can also be divided into a group of vibration fundamental frequencies. The vibration fundamental frequencies of 100-200 continuous overhead line system locators in the current area can be further divided into a group of vibration fundamental frequencies. That is to say, can divide into a set of vibration fundamental frequency according to actual demand a plurality of continuous vibration fundamental frequency of contact net locator to divide into multiunit vibration fundamental frequency with the current region, and every group the vibration fundamental frequency quantity in the vibration fundamental frequency is the same.
In one embodiment, the processor or the controller may divide the vibration fundamental frequency of each catenary locator in the current area into a plurality of groups of vibration fundamental frequencies according to a first preset rule, and determine a median of each group of vibration fundamental frequencies
In one embodiment, the processor or the controller divides the current region into a plurality of groups of vibration fundamental frequencies according to the first preset rule, and then calculates the median of each group of vibration fundamental frequencies, so as to determine the median of the nth group of vibration fundamental frequencies as
Wherein n is an integer of 2 or more.
S108: and determining whether the ice condensation state occurs in each overhead line system locator in the current area based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group, and determining whether the ice condensation state occurs in the current area based on the number of the overhead line system locators in the ice condensation state.
In one embodiment, whether the ice condensation state occurs in each catenary locator in the current area may be determined by the processor or the controller based on a median of a current set of the fundamental vibration frequencies and a median of a previous set of the fundamental vibration frequencies, and whether the ice condensation state occurs in the current area may be determined based on the number of catenary locators in which the ice condensation state occurs. Specifically, the processor or the controller may compare median numbers of the vibration fundamental frequencies of adjacent groups to determine whether the ice condensation state occurs in the current overhead line system locator, and determine whether the ice condensation state occurs in each of the other overhead line system locators in the current area according to the determination method, so that the number of the overhead line system locators in the current area in which the ice condensation state occurs may be determined.
Then the processor or the controller can compare the number of the catenary locators with the ice condensation state with a set number threshold, and if the number of the catenary locators with the ice condensation state is larger than the set number threshold, it is determined that the ice condensation state occurs in the current area; otherwise, determining that the ice condensation state does not appear in the current area.
For example, comparing differences between the median of the vibration fundamental frequencies of adjacent groups, and if the difference between the median of the vibration fundamental frequency of the previous group and the median of the vibration fundamental frequency of the current group is greater than a preset threshold, determining that the ice condensation state of the contact net positioner occurs; otherwise, the condition that the ice condensation state does not occur in the current overhead line system locator can be determined. In other words, by adopting the method, whether the ice condensation state occurs in the overhead line system locator system can be accurately detected, and the detection efficiency and the detection reliability can be improved.
In the embodiment, by adopting the method, whether the contact net positioner system is in the ice condensation state can be accurately detected, the potential uncertainty of manual detection can be avoided, and the detection efficiency and the detection reliability are improved.
In one embodiment, vibration signals of each overhead line system locator at the current moment are acquired in a plurality of sampling sections in the current area respectively based on preset sampling frequency, and vibration signals x of the overhead line system locator in each sampling section are obtainedm,kThe step of (t) comprises: determining a preset theoretical fundamental vibration frequency f of each overhead line system locator in a plurality of sampling sections in the current aream,0(ii) a Acquiring vibration signals of the contact network positioner in each sampling section at the current moment based on preset sampling frequency to obtain that the vibration signals of the contact network positioner in each sampling section are xm,k(t)。
In one embodiment, the processor or the controller may calculate the preset theoretical fundamental vibration frequency f of each catenary positioner according to preset parametersm,0. In one embodiment, the preset parameter may be a stretch degree of the catenary positioner, a length and a mass of the catenary, and the like. In one embodiment, the preset parameters may be stored in the processor or the controller in advance, or may be input into the processor or the controller by a worker on site during detection. Determining a preset theoretical vibration fundamental frequency of each overhead line system locator in a plurality of sampling sections in the current area through the processor or the controller, and recording the preset theoretical vibration fundamental frequency of the mth overhead line system locator as fm,0。
In one embodiment, the processor or the controller may acquire, through the acceleration sensor or the strain sensor, a vibration signal of the overhead line system locator in each sampling segment at the current time based on a preset sampling frequency, and obtain that the vibration signal of the overhead line system locator in each sampling segment is xm,k(t) of (d). Wherein, the xm,k(t) represents the vibration signal of the mth overhead line system locator in the kth sampling section at the time t.
In one embodiment, vibration signals of each overhead line system locator at the current moment are acquired in a plurality of sampling sections in the current area respectively based on preset sampling frequency, and vibration signals x of the overhead line system locator in each sampling section are obtainedm,k(t) prior to the step of, the method further comprising: dividing a plurality of contact net positioners in the current area into a plurality of sampling sections according to a second preset rule, wherein each sampling section comprises a plurality of contact net positioners, and each sampling section comprises the same number of contact net positioners.
In one embodiment, the second preset rule may be: and dividing every 2048 or 4096 continuous catenary locators in the current area into one sampling section. In one embodiment, each sampling segment may also include other numbers (e.g., 1024, etc.) of the overhead line system locators, and the specific number may be selected according to actual requirements. In one embodiment, when the current area is divided into a plurality of sampling sections, it is required to ensure that the number of the overhead line system locators included in each sampling section is the same, so that subsequent processing is facilitated, and the reliability of detection is improved.
In one embodiment, step S108 includes: comparing difference values based on the median of the current group of the vibration fundamental frequencies and the median of the previous group of the vibration fundamental frequencies to obtain a difference value comparison result; if the difference comparison result is greater than a preset threshold value, determining that ice is condensed on the current overhead line system locator, and if the difference comparison result is less than or equal to the preset threshold value, determining that ice is not condensed on the current overhead line system locator; and determining whether the ice condensation state occurs in the current area or not based on the number of the catenary locators with the ice condensation state.
In one embodiment, the difference comparison is performed based on the median of the current set of fundamental vibration frequencies and the median of the previous set of fundamental vibration frequencies, and the difference comparison result is obtained by: and comparing difference values based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group according to a set formula to obtain a difference value comparison result, wherein the set formula is as follows:
wherein, h is the difference comparison result, δ is the freezing prediction parameter, and the specific numerical range of δ can be set according to actual requirements, for example: can be set to 0.1-0.2; n is an integer greater than 2.
In one embodiment, the specific value of the preset threshold may be set according to actual requirements, for example, the preset threshold may be 0.7 times
I.e. if the median of the fundamental vibration frequencies of the previous group is
The median of the fundamental vibration frequency of the current group needs to be greater than 0.7 times
Otherwise, determining that the ice condensation state of the contact net positioner occurs at present.
In one embodiment, the step of determining whether the ice condensation state occurs in the current area based on the number of catenary locators which have the ice condensation state comprises: comparing the number of the catenary locators with the ice condensation state with a set number threshold; if the number of the catenary locators with the ice condensation state is larger than the set number threshold, determining that the ice condensation occurs in the current area; and if the number of the catenary locators with the ice condensation state is smaller than or equal to the set number threshold, determining that no ice condensation occurs in the current area.
In one embodiment, the specific value of the set number threshold may be set according to actual requirements, for example, the specific value of the set number threshold may be two thirds of the total number of catenary locators in the current area. Specifically, if the total number of the catenary locator numbers in the current area is 120, the specific value of the set number threshold may be set to 80. That is to say, the number of the overhead line system locators with the ice condensation state in the current area exceeds 80, that is, the ice condensation state in the current area can be determined, and at the moment, the overhead line system locator system can remind workers in an alarm mode.
Referring to fig. 2, an embodiment of the present application provides a catenary positioner system 10, including: a data processing device 110. The data processing device is configured to perform the steps of the contact network status detection method according to any one of the embodiments. In one embodiment, the data processing device 110 may be a data processor or the like. In one embodiment, the catenary positioner system 10 further includes a sensor 120 and a data collector 130. The sensor 120 performs data interaction with the data processing device 110 through the data collector 130.
The sensor 120 is mounted on a positioner of a contact line along a railway. The data collector 130 is installed along the railway. One or more of the sensors 120 are in wireless communication with one of the data collectors 130 based on the mounting density of the sensors 120. The data collector 130 transmits data to the data processing device 110 via a data transmission network 140. The sensor 120 includes a temperature sensor and an acceleration sensor. The temperature sensor is arranged at the joint of the contact net positioner and the positioning wire clamp. The acceleration sensor is arranged at the joint of the contact net positioner and the positioning wire clamp.
In one embodiment, the temperature sensor is mounted at the joint of the overhead line system positioner and the positioning wire clamp through a fixing bracket. The contact net positioner is connected with a contact line through the positioning wire clamp, and the temperature change in the positioner can reflect the temperature condition of the positioner more than the ambient temperature. Therefore, the temperature sensor is arranged at the joint of the contact net positioner and the positioning wire clamp, and the data detected by the temperature sensor is more effective than that of the data arranged on the periphery of a railway. And meanwhile, the temperature sensor is fixed on the fixed support through a bolt, and if the temperature sensor fails, the temperature sensor is convenient to replace.
Similarly, the acceleration sensor can also be arranged at the joint of the contact net positioner and the positioning wire clamp through the fixing support. The positioning wire clamp is a main connecting structure of the contact net positioner and the contact wire, the acceleration sensor is arranged at the connecting position of the contact net positioner and the positioning wire clamp, the influence of the contact net vibration on the acceleration sensor caused by various factors can be effectively acquired, and the effectiveness of the detection data of the acceleration sensor is improved.
In this embodiment, the contact network locator system 10 may utilize the temperature sensor to detect the temperature of the contact network locator, utilize the acceleration sensor to detect the vibration change of the contact network locator, transmit the detection data to the data acquisition unit 130, and then send the detection data to the data processing device 110 through the network, thereby improving the reliability of the detection.
In summary, according to the contact network state detection method, whether the ice condensation state occurs in the contact network positioner system can be accurately detected, potential uncertainty of manual detection can be avoided, and detection efficiency and detection reliability are improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The method for detecting the state of the overhead line system is characterized by being applied to an overhead line system locator system and comprising the following steps:
respectively acquiring vibration signals of each overhead line system locator at the current moment in a plurality of sampling sections in the current area based on preset sampling frequency to obtain vibration signals x of the overhead line system locators in each sampling sectionm,k(t), m is a natural number, k is an integer;
the vibration signal x in each sampling section is measuredm,k(t) processing the data to obtain a power spectrum P of each sampling sectionm,k(f) And determining the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,k；
Dividing the vibration fundamental frequency of each overhead contact system locator in the current area into a plurality of groups of vibration fundamental frequencies according to a first preset rule, and determining the median of each group of vibration fundamental frequencies
n is an integer greater than or equal to 2;
and determining whether the ice condensation state occurs in each overhead line system locator in the current area based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group, and determining whether the ice condensation state occurs in the current area based on the number of the overhead line system locators in the ice condensation state.
2. The method for detecting the state of the overhead line system of claim 1, wherein the vibration signal x of each overhead line system locator in each sampling section is obtained by acquiring the vibration signal of each overhead line system locator at the current moment in a plurality of sampling sections in the current area based on a preset sampling frequency respectivelym,kThe step of (t) comprises:
determining a preset theoretical fundamental vibration frequency f of each catenary positioner in a plurality of sampling sections in the current aream,0；
Acquiring vibration signals of the contact net positioner in each sampling section at the current moment based on preset sampling frequency to obtain vibration signals x of the contact net positioner in each sampling sectionm,k(t)。
3. The method for detecting the state of the overhead line system of claim 2, wherein the vibration signal of the overhead line system locator in each sampling section at the current moment is acquired based on a preset sampling frequency to obtain the vibration signal x of the overhead line system locator in each sampling sectionm,kThe step of (t) comprises:
acquiring vibration signals of each overhead line system locator in each sampling section at the current moment through a wireless acceleration sensor or a strain sensor based on preset sampling frequency to obtain vibration signals x of the overhead line system locators in each sampling sectionm,k(t)。
4. The contact net state detection method of claim 1The method is characterized in that vibration signals of each overhead line system locator at the current moment are acquired in a plurality of sampling sections in the current area respectively based on preset sampling frequency, and vibration signals x of the overhead line system locators in each sampling section are obtainedm,k(t) prior to the step of, the method further comprising:
dividing a plurality of contact net positioners in the current area into a plurality of sampling sections according to a second preset rule, wherein each sampling section comprises a plurality of contact net positioners, and each sampling section comprises the same number of contact net positioners.
5. The catenary condition detecting method according to claim 1, wherein the vibration signal x in each sampling segment is subjected tom,k(t) processing the data to obtain a power spectrum P of each sampling sectionm,k(f) And determining the power spectrum P of each sampling section based on the preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,kComprises the following steps:
the vibration signal x in each sampling section is measuredm,k(t) processing the data according to Fourier transform to obtain a power spectrum P of each sampling segmentm,k(f)；
Determining the power spectrum P of each sampling section based on a preset theoretical vibration fundamental frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,k。
6. The catenary condition detecting method according to claim 5, wherein the power spectrum P of each sampling section is determined based on a preset theoretical fundamental vibration frequencym,k(f) Obtaining the vibration fundamental frequency f of each contact net positioner at the maximum corresponding frequency pointm,kComprises the following steps:
determining the power spectrum P of each sampling section in a set range based on a preset theoretical vibration fundamental frequencym,k(f) The maximum time corresponding frequency point is obtainedThe vibration fundamental frequency of each contact net positioner is fm,kThe setting ranges are as follows:
[(1-ε)fm,k-1,(1+ε)fm,k-1]
wherein epsilon is a frequency search parameter, and the numerical range of epsilon is 0.2-0.4; f. ofm,k-1And representing the vibration fundamental frequency of the mth overhead line system locator in the kth-1 sampling section.
7. The method for detecting the state of the overhead line system of claim 1, wherein the step of determining whether the ice condensation state occurs in each overhead line system locator in the current area based on the median of the current set of fundamental vibration frequencies and the median of the previous set of fundamental vibration frequencies, and the step of determining whether the ice condensation state occurs in the current area based on the number of overhead line system locators in which the ice condensation state occurs comprises the steps of:
comparing difference values based on the median of the current group of the vibration fundamental frequencies and the median of the previous group of the vibration fundamental frequencies to obtain a difference value comparison result;
if the difference comparison result is greater than a preset threshold value, determining that ice is condensed on the current overhead line system locator, and if the difference comparison result is less than or equal to the preset threshold value, determining that ice is not condensed on the current overhead line system locator;
and determining whether the ice condensation state occurs in the current area or not based on the number of the catenary locators with the ice condensation state.
8. The method for detecting the state of the overhead line system of claim 7, wherein the step of comparing the difference value based on the median of the fundamental vibration frequency of the current group and the median of the fundamental vibration frequency of the previous group to obtain the difference value comparison result comprises:
and comparing difference values based on the median of the vibration fundamental frequency of the current group and the median of the vibration fundamental frequency of the previous group to obtain a difference value comparison result, wherein the formula is as follows:
wherein h is the difference comparison result, δ is a freezing prediction parameter, δ has a numerical range of 0.1-0.2, and n is an integer greater than 2.
9. The overhead line system state detection method of claim 8, wherein the step of determining whether the ice condensation state occurs in the current area based on the number of overhead line system locators in which the ice condensation state occurs comprises:
comparing the number of the catenary locators with the ice condensation state with a set number threshold;
if the number of the catenary locators with the ice condensation state is larger than the set number threshold, determining that the ice condensation occurs in the current area;
and if the number of the catenary locators with the ice condensation state is smaller than or equal to the set number threshold, determining that no ice condensation occurs in the current area.
10. A contact net positioner system, comprising:
data processing equipment for carrying out the method steps of the catenary condition detection of any of claims 1-9.
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