CN110329116B - Automatic neutral section passing detection device and detection method for electric locomotive - Google Patents
Automatic neutral section passing detection device and detection method for electric locomotive Download PDFInfo
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- CN110329116B CN110329116B CN201910706076.9A CN201910706076A CN110329116B CN 110329116 B CN110329116 B CN 110329116B CN 201910706076 A CN201910706076 A CN 201910706076A CN 110329116 B CN110329116 B CN 110329116B
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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 73
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/04—Arrangements for cutting in and out of individual track sections
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Abstract
The invention discloses an automatic passing neutral section detection device of an electric locomotive and a detection method thereof, relating to the technical field of acoustic detection, wherein the device comprises an incoming line sensor (1), a signal collector (2), a speed measurement sensor (3), a motion magnetic steel (4), a sound collection unit (5), an off-line sensor (6), a train number identification system (7) and a computer processing system; the train number recognition system is characterized in that the signal collector (2), the speed measuring sensor (3), the moving magnetic steel (4) and the sound collection unit (5) are respectively installed on the side face of the track, the incoming line sensor (1) and the off-line sensor (6) are respectively arranged at the incoming line end and the off-line end of the track, and the train number recognition system (7) is arranged on the rear side of the incoming line end of the track. The invention utilizes the acoustic detection technology to realize the characteristics of high-efficiency detection of automatic passing neutral section, stronger anti-interference performance, higher detectable rate and the like, and can prevent potential safety hazards caused by failure of vehicle-mounted automatic passing neutral section.
Description
Technical Field
The invention relates to the technical field of acoustic detection, in particular to a method for realizing a detection method of an automatic neutral section passing detection device of an electric locomotive by using an acoustic detection technology.
Background
With the development of railway business in China, electric locomotives are widely applied to the field of railway transportation, because a power supply contact network of an electrified railway adopts split-phase section power supply, the electric locomotive must be powered off and idled in the split-phase section, and vehicle-mounted automatic split-phase passing is mainly used and manual operation is used as assistance in split-phase processing.
Due to the influence of the operating environment of the electric locomotive, the automatic neutral-section passing device needs to be detected regularly. The traditional detection mode adopts a mode of manually detecting or detecting the track current. The manual detection efficiency is low, the human influence factor is high, and scientific analysis cannot be carried out. The rail current detection mode has the defects of weak anti-interference performance, low detectable rate and the like. Therefore, the method for designing the vehicle-mounted automatic passing neutral section detection device of the electric locomotive, which has stronger anti-interference performance and higher detectable rate, is a technical problem to be solved in the technical field of automatic passing neutral section of the electric locomotive.
Disclosure of Invention
The invention aims to provide a vehicle-mounted automatic passing neutral section detection device and a detection method thereof for an electric locomotive by utilizing an acoustic detection technology, so that the characteristics of high-efficiency detection of automatic passing neutral section, higher anti-interference performance, higher detectable rate and the like are realized, and potential safety hazards caused by failure of the vehicle-mounted automatic passing neutral section are prevented.
In order to achieve the purpose, the invention adopts the technical scheme that:
an automatic neutral section passing detection device of an electric locomotive comprises an incoming line sensor, a signal collector, a speed measuring sensor, a motion magnetic steel, a sound collecting unit, an off-line sensor, a train number identification system and a computer processing system; the signal collector, the speed measuring sensor, the moving magnetic steel and the sound collecting unit are respectively arranged on the side face of the track, the incoming line sensor and the off-line sensor are respectively arranged at the incoming line end and the off-line end of the track, and the car number identification system is arranged on the rear side of the incoming line end of the track.
Furthermore, the number of the speed measuring sensors is not less than three, the number of the moving magnetic steels is not less than three, and the number of the sound collecting units is not less than two; the signal collectors are symmetrically installed along the track to collect data; the speed measuring sensor and the motion magnetic steel are installed in pairs; the speed measuring sensor and the motion magnetic steel are installed in a triangular arrangement mode.
Judging whether the locomotive reaches the position of the moving magnetic steel by calculating the current speed of the locomotive, wherein the moving magnetic steel is matched with the magnetic steel on the locomotive to control the opening and closing of a main section of the locomotive, and the signal collector collects and stores sound data information; the computer processing system can read the sound data from the signal collector, analyze and display the sound data.
The sound collecting unit in the automatic passing neutral section detecting device of the electric locomotive is not limited to collecting sound signals or vibration signals by a microphone or other vibration sensors.
The detection method of the automatic passing neutral section detection device of the electric locomotive comprises the following steps: firstly, when an electric locomotive enters a detection area, an incoming line sensor sends an incoming line signal to a signal collector after acquiring the incoming line signal, the signal collector starts working and sends a working start signal to a computer processing system, and a sound collection unit collects a sound signal when a current fan runs as a background signal; then, the electric locomotive passes through the first moving magnetic steel, the main section of the electric locomotive is disconnected, and the sound acquisition unit acquires the current sound signal; secondly, when the electric locomotive passes through the next moving magnetic steel, the main section of the electric locomotive is closed, and the sound acquisition unit acquires a sound signal of the running of the fan; thirdly, after the electric locomotive passes through the off-line sensor, the off-line sensor sends an off-line signal to the signal collector, the signal collector collects the digital signal of the sound recorded by the sound collecting unit and sends a working ending signal to the computer processing system; and finally, after receiving the working ending signal, the computer processing system acquires the data of the signal collector, analyzes and displays the data.
In the automatic passing neutral section detection device, the fan runs when the main section of the electric locomotive is closed, and the fan stops when the main section of the electric locomotive is disconnected. The method comprises the steps of collecting sound data when a fan is started and stopped, and converting time domain signals of collected sound into frequency domain signals through Fourier transformation. And analyzing the frequency domain signal data through a computer processing system, judging the working state of the fan and further judging whether the main section of the electric locomotive is in a closed state or an open state.
The background noise data in the fan stop state and the operation data in the fan starting state in the automatic passing neutral section detection device judge that the amplitude of the frequency domain waveform of the fan in the operation state is higher than that of the background noise data in the fan stop state on a plurality of fixed frequency points through the analysis of the frequency domain signal.
The sound data of all the collection fans in the automatic passing neutral section detection device in the starting and stopping state are processed by computer software in the early stage. The interference signals are filtered, so that the sound signals are easier to identify.
The computer processing system in the automatic passing neutral section detection device analyzes the sound data of the fan in the starting and stopping state, and draws an optimal frequency domain waveform diagram of the starting and stopping of the fan of the train number according to the train number identification system.
The beneficial effects of the invention are as follows:
1. the invention discloses a detection method for detecting an automatic passing neutral section device of a vehicle-mounted electric locomotive by adopting an acoustic detection technology, which is a method for detecting whether the automatic passing neutral section is abnormal or not based on the principle that different objects have different vibration frequencies when moving.
2. The method utilizes an acoustic detection technology, and when the technology is implemented, the condition of the vehicle-mounted automatic passing phase splitting device can be judged by detecting the starting and stopping states of the fan; and the current sound data can be effectively analyzed through advanced technologies such as big data analysis and cloud computing, and whether the locomotive has other potential safety hazards or not can be detected.
Drawings
FIG. 1 is a schematic installation diagram of an automatic excessive phase detection device for an electric locomotive according to an embodiment.
Fig. 2 is an operational schematic diagram of a detection method of the automatic excessive phase detection device of the electric locomotive according to the embodiment.
FIG. 3 is a diagram of a sound collection original waveform of an automatic excessive phase detection device of an electric locomotive according to the embodiment.
Fig. 4 is a frequency spectrum analysis diagram of the sound collection after data analysis in the automatic neutral section passing detection device of the electric locomotive according to the embodiment.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, an installation schematic diagram of an automatic passing neutral section detection device of an electric locomotive according to the embodiment includes an incoming line sensor 1, two signal collectors 2, three speed measurement sensors 3, three moving magnetic steels 4, two sound collection units 5, an offline sensor 6, a train number identification system 7, and a computer processing system; the signal collector 2, the speed measuring sensor 3, the moving magnetic steel 4 and the sound collecting unit 5 are respectively arranged on the side face of the track, the incoming line sensor 1 and the off-line sensor 6 are respectively arranged at the incoming line end and the off-line end of the track, and the car number recognition system 7 is arranged on the rear side of the incoming line end of the track.
The signal collectors 2 are symmetrically arranged along the track to collect data; the speed measuring sensor 3 and the motion magnetic steel 4 are installed in pairs; the speed measuring sensor 3 and the motion magnetic steel 4 are installed in a triangular arrangement mode.
Whether the locomotive reaches the position of the moving magnetic steel 4 is judged by calculating the current speed of the locomotive, the moving magnetic steel 4 is matched with the magnetic steel on the locomotive to control the opening and closing of the main section of the locomotive, and the signal collector 2 collects and stores sound data information; the computer processing system can read the sound data from the signal collector 2, analyze and display the data information.
The sound collecting unit 5 in the automatic neutral-section passing detection device can collect sound signals or vibration signals by using a microphone or other vibration sensors.
As shown in fig. 2, in the working schematic diagram of the detection method of the automatic passing neutral section detection device of the electric locomotive according to the embodiment, in the automatic passing neutral section detection process, the signal collector 2 collects sound signals collected by a plurality of different sound collection units 5, the sound collection units detect sound signals of a fan of the electric locomotive during a period of "before main section disconnection-main section closing", and the signal collector 2 transmits data to a computer processing system in a wireless or wired manner. Through processing and analyzing the sound signals, the running process of the electric locomotive passing through the neutral section automatically can be detected, and the driving safety is guaranteed.
On the basis of fig. 1, a method for detecting an automatic passing neutral section detection device of an electric locomotive by using an acoustic detection technology includes the following specific steps:
step one, when an electric locomotive enters a detection area, an incoming line sensor 1 sends an incoming line signal to a signal collector 2 after acquiring the incoming line signal, the signal collector 2 starts to work and sends a working start signal to a computer processing system, and a sound collection unit collects a sound signal when a current fan runs as a background signal;
step two, the electric locomotive passes through the first moving magnetic steel, the main section of the electric locomotive is disconnected, and the sound acquisition unit 5 acquires the current sound signal;
step three, when the electric locomotive passes through the next moving magnetic steel, the main section of the electric locomotive is closed, and the sound acquisition unit 5 acquires a sound signal of the running of the fan;
step four, after the electric locomotive passes through the off-line sensor 6, the off-line sensor 6 acquires an off-line signal, the off-line signal is sent to the signal collector 2, the signal collector 2 collects a digital signal of the sound recorded by the sound collection unit, and a working ending signal is sent to the computer processing system;
and step five, after receiving the working ending signal, the computer processing system acquires the data of the signal collector 2, and analyzes and displays the data.
In the automatic passing neutral section detection device, the sound acquisition unit 5 acquires sound data of the running of the fan of the electric locomotive in the states of 'before the main section is disconnected', -in the main section is disconnected ', -after the main section is closed'. Fig. 3 is a time domain waveform diagram of collected sound, and at this time, due to the influence of the external environment of the train, the operation state of the fan is difficult to distinguish through the time domain waveform diagram.
When the electric locomotive passes through the off-line sensor 6, the signal collector 2 sends a working ending signal to the computer processing system, and the computer processing system acquires and analyzes data of the signal collector 2 to obtain a frequency domain waveform diagram of fig. 4. The running frequency of the fan has larger amplitude near the positions of 520HZ, 1100HZ, 1650HZ and 3200HZ according to software algorithm. When the fan stops, the frequency amplitude of the section is weakened. And matching the vehicle number identification with the data analysis of the time through computer processing software, and storing. At this time, the user can compare and analyze the on-site test result remotely through the user interface program. Giving the user a visual experience.
To sum up, the computer processing system converts the time domain signal of the sound data into the frequency domain signal through a software algorithm, and then analyzes the frequency domain signal to filter the interference caused by the external environment factors. The running state of the automatic neutral section passing device of the electric locomotive is judged by determining the specific frequency domain waveform of the fan, so that the detection aim is fulfilled.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention by those skilled in the art can be still within the protection scope of the present invention without departing from the technical scope of the present invention.
Claims (9)
1. The utility model provides an automatic neutral section detection device that crosses of electric locomotive which characterized in that: the system comprises an incoming line sensor (1), a signal collector (2), a speed measuring sensor (3), moving magnetic steel (4), a sound collecting unit (5), an off-line sensor (6), a car number identification system (7) and a computer processing system; the signal collector (2), the speed measuring sensor (3), the moving magnetic steel (4) and the sound collecting unit (5) are respectively arranged on the side face of the track, the incoming line sensor (1) and the off-line sensor (6) are respectively arranged at the incoming line end and the off-line end of the track, and the train number recognition system (7) is arranged on the rear side of the incoming line end of the track;
the detection method of the automatic neutral section passing detection device of the electric locomotive comprises the following steps:
step one, when an electric locomotive enters a detection area, an incoming line sensor (1) sends an incoming line signal to a signal collector (2) after acquiring the incoming line signal, the signal collector (2) starts to work and sends a working start signal to a computer processing system, and a sound collection unit (5) collects a sound signal when a current fan runs as a background signal;
step two, the electric locomotive passes through the first moving magnetic steel, the main section of the electric locomotive is disconnected, and the sound acquisition unit (5) acquires a sound signal of the current fan stopping;
step three, when the electric locomotive passes through the next moving magnetic steel, the main section of the electric locomotive is closed, and the sound acquisition unit (5) acquires the sound signal of the running fan;
step four, the electric locomotive passes through the off-line sensor (6), the off-line sensor (6) sends off-line signals to the signal collector (2) after acquiring the off-line signals, the signal collector (2) collects digital signals of sounds recorded by the sound collection unit, and sends a working ending signal to the computer processing system;
and step five, after receiving the working ending signal, the computer processing system acquires the data of the signal collector (2), analyzes and displays the data.
2. The automatic excessive phase detection device for the electric locomotive according to claim 1, characterized in that: the speed measuring sensor (3) is not less than three, the movement magnetic steel (4) is not less than three, and the sound collecting unit (5) is not less than two.
3. The automatic excessive phase detection device for the electric locomotive according to claim 1, characterized in that: the signal collectors (2) are symmetrically arranged along the track to collect data; the speed measuring sensor (3) and the motion magnetic steel (4) are installed in pairs; the speed measuring sensor (3) and the motion magnetic steel (4) are installed in a triangular arrangement mode.
4. The automatic excessive phase detection device for the electric locomotive according to claim 1, wherein: whether the locomotive reaches the position of the moving magnetic steel (4) is judged by calculating the current speed of the locomotive, the moving magnetic steel (4) is matched with the magnetic steel on the locomotive to control the opening and closing of the main section of the locomotive, and the signal collector (2) collects and stores sound data information; the computer processing system can read the sound data from the signal collector (2), analyze and display the sound data.
5. The automatic excessive phase detection device for the electric locomotive according to claim 1, wherein: the sound collection unit (5) is not limited to collecting sound signals or vibration signals with a microphone or other vibration sensor.
6. The automatic excessive phase detection device for the electric locomotive according to claim 1, characterized in that: the method comprises the steps that a fan runs when a main section of the electric locomotive is closed, the fan stops when the main section of the electric locomotive is disconnected, sound data when the fan starts and stops are collected, time domain signals of the collected sound are converted into frequency domain signals through Fourier transformation, the frequency domain signal data are analyzed through a computer processing system, the working state of the fan is judged, and then whether the main section of the electric locomotive is closed or disconnected is judged.
7. The automatic excessive phase detection device for electric locomotive according to claim 6, characterized in that: and analyzing the frequency domain signals to judge that the amplitude of the frequency domain waveform of the fan in the running state is higher than that of the background noise data on a plurality of fixed frequency points in the fan stopping state.
8. The automatic neutral-section passing detection device for the electric locomotive according to claim 1, 6 or 7, wherein: all sound data of the collected fans in the starting and stopping states are subjected to early-stage data processing through computer software, interference signals are filtered, and the sound signals are easier to identify.
9. The automatic excessive phase detection device for the electric locomotive according to claim 8, wherein: and the computer processing system analyzes the sound data of the draught fan in the starting and stopping state and draws an optimal frequency domain oscillogram of the starting and stopping state of the draught fan of the train number according to the train number identification system (7).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008005931A2 (en) * | 2006-06-30 | 2008-01-10 | Nac Service, Inc. | Acoustic based positioning system and method |
| CN102650573A (en) * | 2012-05-14 | 2012-08-29 | 南京拓控信息科技有限公司 | Detecting device for auto-passing phase-splitting function of electric locomotive |
| CN104627029A (en) * | 2015-03-06 | 2015-05-20 | 南京拓控信息科技有限公司 | Vehicle-mounted automatic passing neutral section detector of railway electric locomotive |
| CN207697542U (en) * | 2017-11-14 | 2018-08-07 | 上海铁路局南京东机务段 | A kind of two-way automatic neutral-section passing device of electric locomotive |
| WO2019107688A1 (en) * | 2017-11-30 | 2019-06-06 | ㈜넷케이티아이 | Distributed acoustic fiber optic sensor-based railway operating state monitoring system, and method therefor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6830224B2 (en) * | 2001-02-26 | 2004-12-14 | Railroad Transportation Communication Technologies (Rtct) Llc | Rail communications system |
| GB0915322D0 (en) * | 2009-09-03 | 2009-10-07 | Westinghouse Brake & Signal | Railway systems using fibre optic hydrophony systems |
| CN103192850A (en) * | 2013-04-22 | 2013-07-10 | 陈子康 | Integrated running train safety monitoring system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008005931A2 (en) * | 2006-06-30 | 2008-01-10 | Nac Service, Inc. | Acoustic based positioning system and method |
| CN102650573A (en) * | 2012-05-14 | 2012-08-29 | 南京拓控信息科技有限公司 | Detecting device for auto-passing phase-splitting function of electric locomotive |
| CN104627029A (en) * | 2015-03-06 | 2015-05-20 | 南京拓控信息科技有限公司 | Vehicle-mounted automatic passing neutral section detector of railway electric locomotive |
| CN207697542U (en) * | 2017-11-14 | 2018-08-07 | 上海铁路局南京东机务段 | A kind of two-way automatic neutral-section passing device of electric locomotive |
| WO2019107688A1 (en) * | 2017-11-30 | 2019-06-06 | ㈜넷케이티아이 | Distributed acoustic fiber optic sensor-based railway operating state monitoring system, and method therefor |
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