CN110450820B - Derailment detection method and system based on pressure of primary vertical shock absorber - Google Patents
Derailment detection method and system based on pressure of primary vertical shock absorber Download PDFInfo
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- CN110450820B CN110450820B CN201910752367.1A CN201910752367A CN110450820B CN 110450820 B CN110450820 B CN 110450820B CN 201910752367 A CN201910752367 A CN 201910752367A CN 110450820 B CN110450820 B CN 110450820B
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- 238000012544 monitoring process Methods 0.000 claims description 7
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
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Abstract
The invention discloses a derailment detection method and a system based on primary vertical shock absorber pressure, wherein the derailment detection method based on the primary vertical shock absorber pressure comprises the following steps: A. a pressure sensor mounted on a series of vertical shock absorbers monitors pressure; B. judging the magnitude of the pressure value monitored by the pressure sensor, and if the pressure value fluctuates in a set interval, jumping to the step C1; if the pressure value has a zero value and exceeds the set threshold value within the time t after the zero value appears, jumping to the step C2; C1. outputting a detection result as non-derailment; C2. outputting a detection result as derailment; in the step C1 and the step C2, the detection result is output and transmitted to the train control system. The invention is safe and effective and is convenient to use.
Description
Technical Field
The invention relates to the technical field of derailment detection, in particular to a derailment detection method and system based on pressure of a primary vertical shock absorber.
Background
With the continuous deepening of the urbanization in China, the urban rail transit industry is also continuously developed and advanced. One hot spot that arises from the past is that of city rail train unmanned driving. Due to the omnibearing protection of the life of passengers, the unmanned train must be equipped with a derailment detection method, and the derailment detection technology is a key point and a difficult point at present.
In China, the derailment detection method is just started, and a plurality of derailment detection manufacturers appear on the market successively, and the schemes are different. Two main categories are available, one is a non-contact scheme: the electric eddy current detection scheme is a contact scheme: based on the scheme that deformation is monitored after a bogie smashes a rail. Both solutions, each having advantages, also have their own limitations.
In order to inject fresh blood into the derailment detection field, diversified choices are provided for owners, a new derailment detection implementation mode is explored, and great significance is achieved in promoting the continuous forward development of the technology in the derailment detection field.
Disclosure of Invention
The invention aims to provide a derailment detection method and system based on the pressure of a primary vertical shock absorber in order to search a brand-new derailment detection mode for a railway vehicle.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a derailment detection method based on pressure of a primary vertical shock absorber is characterized by comprising the following steps:
a, a pressure sensor arranged on a series of vertical shock absorbers monitors pressure;
b, judging the magnitude of the pressure value monitored by the pressure sensor, and if the pressure value fluctuates in a set interval, jumping to the step C1; if the pressure value has a zero value and exceeds the set threshold value within the time t after the zero value appears, jumping to the step C2;
c1, outputting a detection result that the rail is not derailed;
step C2. outputs a detection result as derailment.
Preferably, in the steps C1 and C2, the output detection result is transmitted to a train control system.
Based on the same inventive concept, the invention also provides a derailment detection system based on the pressure of the primary vertical shock absorber, which is characterized by comprising the following steps:
a pressure sensor mounted on a vertical shock absorber: for monitoring the pressure experienced by a series of vertical shock absorbers;
a judging unit: the pressure sensor is used for detecting the pressure value monitored by the pressure sensor;
an output unit: the device is used for outputting a detection result as non-derailment when the pressure value fluctuates in a set interval; and when the pressure value has a zero value and exceeds a set threshold value within t time after the zero value appears, outputting a detection result as derailment.
Preferably, the output unit is electrically connected with the train control system, and the output unit transmits the output detection result to the train control system.
The invention identifies derailment signals through a pressure sensor installed in a vertical shock absorber. When the vehicle normally runs, the pressure of a vertical shock absorber fluctuates in a relatively stable interval; when the derailment takes place, the bogie falls the rail and pounces to ground, and vertical shock absorber of a system has the zero load state of a short time, and the wheel pounces to ground because the initial velocity that vehicle gravity and free fall formed, and vertical shock absorber of a system can receive great unusual impact, and the pressure surge. The derailment signal is identified by monitoring the pressure change rule of a series of vertical shock absorbers, and the derailment alarm signal is triggered. The invention is safe and effective and is convenient to use.
Drawings
FIG. 1 is a diagram of the position of a truck and a tandem vertical shock absorber.
Fig. 2 is a schematic view of the installation position of the pressure sensor in the present invention.
FIG. 3 is a graph illustrating nominal characteristics of a vertical shock absorber.
FIG. 4 is a graphical illustration of damping force during normal operation of a vertical shock absorber.
FIG. 5 is a graphical illustration of a damping force profile for a vertical shock absorber during normal operation to derailment.
Wherein, 1 is a bogie, 2 is a vertical shock absorber, 3 is a pressure sensor, and 4 is a connecting cable.
Detailed Description
In the invention, whether the bogie 1 and the vehicle derail or not is detected by monitoring the pressure of the vertical shock absorber 2.
As shown in fig. 1, a primary vertical shock absorber 2 is installed between a wheel axle box and a bogie 1 frame, and directly receives impact vibration from a wheel. If the vehicle is operating normally, the vibration impact on the wheels is mainly from the relationship with the rails, and the rail conditions are known, so that the pressure of the vertical shock absorber 2 fluctuates in a relatively stable region during normal operation. When the vehicle is derailed, the bogie 1 falls off the steel rail and hits the ground, the vertical shock absorber 2 has a short-time zero-load state, and then the wheels hit the ground due to the vehicle gravity and the initial velocity formed by free falling, and the vertical shock absorber 2 is subjected to large abnormal impact and has surge pressure. The system identifies the derailment signal by monitoring the change rule of the process pressure and triggers the derailment alarm signal.
The mounting position of the pressure sensor 3 is shown in fig. 2.
Table 1 is a table of parameters for the characteristics of a vertical shock absorber.
TABLE 1 vertical shock absorber characteristic parameter table
The characteristic curve is plotted according to the characteristic parameters of a series of vertical shock absorbers 2 as shown in figure 3. It can be seen that the working speed V of the primary vertical shock absorber 2 is the normal operation of the train0The interval is 0.1m/s-0.2m/s, and the damping force F is known according to the characteristic curve0Will fluctuate randomly within the interval of 0.35-1.05kN, as shown in figure 4.
From the principle of a vertical shock absorber 2, it is known that the damping force F is provided by the oil pressure in the internal hydraulic cylinder, which is proportional to the internal oil pressure P:
F＝P*Δs
where Δ s is the effective area of the internal cylinder piston, a constant associated with a series of vertical shock absorbers 2.
Thus, the pressure inside the vertical shock absorber 2 can be referenced to the damping force curve.
When derailment occurs, the wheel set falls off from the rail surface, the wheel set is suspended, the primary vertical shock absorber 2 loses load, and the internal oil pressure tends to decline or tend to be relaxed; when the wheel pair hits the ground, the gravity action and the self kinetic energy cause larger abnormal impact to the primary vertical shock absorber 2 when the wheel pair hits the ground. The working speed of the vertical shock absorber 2 at this time is several times as high as that of the normal operation:
V1＝nV0
n is different according to different motion working conditions; the working condition that the initial speed is zero when the vehicle derails is analyzed, and a certain speed V is generated due to the action of gravity in the falling process1At the moment when the wheels hit the ground, the bogie 1 frame remains V due to inertia1Velocity motion, the velocity of motion of a vertical shock absorber 2 being the velocity of motion of the frame relative to the wheel set, here about V1。
From the law of momentum, it follows that:
h is the distance from the rail surface to the ground, and 60 steel rails are taken to be 176mm high; get V1＝1.88m/s。
The damping force F corresponding to the characteristic curve of a vertical shock absorber1Fig. 5 shows a damper damping force curve during derailment plotted according to the above data at 6.58 kN.
From the above analysis, it can be seen that a series of vertical shock absorbers 2 exhibit distinct characteristics during derailment. The invention monitors the pressure of a series of vertical shock absorbers 2 and identifies derailment signals.
The invention relates to a derailment detection method based on pressure of a primary vertical shock absorber, which comprises the following steps of:
a, a pressure sensor 3 arranged on a primary vertical shock absorber 2 monitors pressure;
b, judging the magnitude of the pressure value monitored by the pressure sensor 3, and if the pressure value fluctuates in a set interval, jumping to the step C1; if the pressure value has a zero value and exceeds the set threshold value within the time t after the zero value appears, jumping to the step C2;
c1, outputting a detection result that the rail is not derailed;
step C2. outputs a detection result as derailment.
In the step C1 and the step C2, the detection result is output and transmitted to the train control system.
The invention relates to a derailment detection system based on pressure of a primary vertical shock absorber, which comprises:
a judging unit: used for judging the magnitude of the pressure value monitored by the pressure sensor 3;
an output unit: the device is used for outputting a detection result as non-derailment when the pressure value fluctuates in a set interval; and when the pressure value has a zero value and exceeds a set threshold value within t time after the zero value appears, outputting a detection result as derailment.
The output unit is electrically connected with the train control system and transmits the output detection result to the train control system. The train control system is not shown in the drawings, but does not affect the understanding and implementation of the present invention by those skilled in the art.
In conclusion, the invention has the following characteristics:
(1) when the train normally runs, the wheel-rail relationship is relatively stable, the load of the primary vertical shock absorber 2 is also relatively stable, the pressure of the primary vertical shock absorber fluctuates relatively stably in a stable interval, and the system keeps normal detection.
(2) When the train is derailed, the bogie 1 drops off the rail, and a vertical shock absorber 2 has a zero load state for a short time. The wheels are then hit against the ground, and the primary vertical shock absorber 2 is subjected to a large abnormal shock and a surge of pressure due to the initial velocity of the free fall of the vehicle. The system identifies the derailment signal by monitoring the change rule of the process pressure and triggers the derailment alarm signal. The alarm signal is sent to the train control system through the connecting cable 4, and the vehicle takes relevant emergency measures, so that the driving safety is ensured.
(3) The invention can be used as an independent derailment detection system to be installed on the unmanned vehicle, and can also be cooperated with other derailment detection methods to form complementation.
(4) By analyzing the pressure data collected by the present invention, the condition of a series of vertical shock absorbers 2 can also be diagnosed.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A derailment detection method based on pressure of a primary vertical shock absorber is characterized by comprising the following steps:
a, a pressure sensor (3) arranged on a vertical shock absorber (2) monitors pressure;
b, judging the magnitude of the pressure value monitored by the pressure sensor (3), and if the pressure value fluctuates in a set interval, jumping to the step C1; if the pressure value has a zero value and exceeds the set threshold value within the time t after the zero value appears, jumping to the step C2;
c1, outputting a detection result that the rail is not derailed;
step C2. outputs a detection result as derailment.
2. The method for detecting derailment based on pressure of a train of vertical shock absorbers according to claim 1, wherein the output of the detection results in steps C1 and C2 is transmitted to a train control system.
3. A derailment detection system based on a primary vertical shock absorber pressure, comprising:
pressure sensor (3) mounted on a series of vertical shock absorbers (2): for monitoring the pressure to which a series of vertical shock absorbers (2) are subjected;
a judging unit: the pressure sensor is used for judging the magnitude of the pressure value monitored by the pressure sensor (3);
an output unit: the device is used for outputting a detection result as non-derailment when the pressure value fluctuates in a set interval; and when the pressure value has a zero value and exceeds a set threshold value within t time after the zero value appears, outputting a detection result as derailment.
4. The system according to claim 3, wherein the output unit is electrically connected to the train control system, and wherein the output unit transmits the output detection to the train control system.
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| CN113733927B (en) * | 2021-09-01 | 2023-04-07 | 中车株洲电力机车有限公司 | Magnetic-levitation train, levitation control system and protection method for dropping and rail smashing of magnetic-levitation train |
| CN115946734A (en) * | 2022-12-30 | 2023-04-11 | 重庆赛迪奇智人工智能科技有限公司 | Derailment detection method and device |
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| US6322121B1 (en) * | 2000-08-25 | 2001-11-27 | Charles L. French | Wheel assembly with a derail guard for rail |
| JP5608408B2 (en) * | 2010-04-23 | 2014-10-15 | 日立Ｇｅニュークリア・エナジー株式会社 | Dolly, fuel changer, dolly reinforcement method |
| CN202413831U (en) * | 2011-12-23 | 2012-09-05 | 济南轨道交通装备有限责任公司 | High-speed rail wagon bogie |
| CN202378897U (en) * | 2011-12-26 | 2012-08-15 | 南车四方车辆有限公司 | Bogie for rail working vehicle and rail working vehicle |
| CN207826253U (en) * | 2017-12-13 | 2018-09-07 | 中南大学 | A kind of rail vehicle derailing Overthrow preventing device and rail vehicle truck |
| CN108860205B (en) * | 2018-08-03 | 2023-11-07 | 中车株洲电力机车有限公司 | Derailment detection method and device for railway vehicle |
| CN109780126A (en) * | 2019-03-21 | 2019-05-21 | 中车青岛四方车辆研究所有限公司 | Air spring and rail vehicle |
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