A method for detecting a train derailment using acoustic waves

Abstract

The application discloses a kind of sound wave detection methods of train derailment, comprising: 1) the time when sound wave signal is received by sound wave collection instrument in sound wave collection device is obtained;2) the distance between sound wave collection device and train carriage is calculated according to the time difference of received sound wave signal;3) the deviation degree of carriage is calculated according to the distance between sound wave collection device and train carriage;4) the deviation degree of whole train is obtained by summing up the deviation degree of carriage, and evaluation is made.The application can accurately calculate the distance between carriage and sound wave collection device, so as to obtain the overall deviation degree of train to judge whether train derails, to ensure the safety of transportation.

Description

Technical Field

[0001] This invention belongs to the field of railway transportation, and in particular, it relates to an acoustic detection method for train derailment. Background Technology

[0002] With the rapid development of my country's economy and society and the continuous improvement of people's living standards, trains have become an indispensable mode of transportation, whether for transporting industrial materials or for personal travel. While trains reduce speed to minimize safety hazards when turning, they are more prone to derailment on sections of track where they travel at a constant speed. This can have a significant impact on freight transport safety and the lives and property of the people. To ensure safe operation, it is necessary to detect derailments while the train is in motion. However, current track inspection technologies mostly rely on manual inspection at stations. Derailments are not easily detected when the train is stationary, and manual inspection is time-consuming and labor-intensive. Installing high-definition cameras is too expensive and inconvenient to use.

[0003] Therefore, it is necessary to design a train derailment acoustic detection method to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing detection methods, this invention provides an acoustic detection method for train derailment, which aims to accurately calculate the distance between the carriage and the acoustic acquisition device, thereby determining the overall deviation of the train and judging whether the train has derailed, thus ensuring the safety of railway transportation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The present invention provides an acoustic detection method for train derailment, characterized by the following steps:

[0007] Step 1: Install a sound wave acquisition device on one side of the train track. The sound wave acquisition device contains M sound wave acquisition instruments, and the distance between any two adjacent sound wave acquisition instruments is x.

[0008] Step 2: Obtain the time t at which the sound wave signal is generated by the M sound wave acquisition devices in the i-th carriage of an n-car train moving at a constant speed on the train track. i1 ,t i2 ,…,t im ,…t iM ; where t im This indicates the moment when the m-th acoustic wave acquisition instrument receives the acoustic wave signal generated by the i-th train carriage;

[0009] Step 3: Use equation (1) to obtain the distance X between the sound wave acquisition device and the i-th train car. i Relationship:

[0010]

[0011] In equation (1): v is the speed of sound propagation; t i(m-1)m t represents the time difference between the arrival of the sound wave generated by the i-th train carriage at the (m-1)-th sound wave acquisition device and the m-th sound wave acquisition device; im(m+1) The time difference between the arrival of the sound wave generated by the i-th train car at the m-th and (m+1)-th sound wave acquisition devices;

[0012] Step 4: Use equation (2) to obtain the i-th train car at t im deviation at time a(t) im ):

[0013]

[0014] In equation (2): R i This represents the theoretical distance between the acoustic wave acquisition device and the i-th train car;

[0015] Step 5: Use equation (3) to obtain the train's position at t. m Overall deviation at time a(t) m ):

[0016] a(t m )=a(t 1m )+a(t 2m )+…+a(t im )+…a(t nm (3)

[0017] Step 6, if a(t) m If a(t) is 0, it means the train has not derailed. m If the value is not 0, it indicates that the train has derailed and the train applies emergency braking.

[0018] The present invention provides an electronic device, comprising a memory and a processor, wherein the memory is used to store a program that supports the processor in executing the acoustic wave detection method, and the processor is configured to execute the program stored in the memory.

[0019] The present invention discloses a computer-readable storage medium on which a computer program is stored, wherein the computer program is executed by a processor to perform the steps of the acoustic wave detection method.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This invention enables trains to promptly detect and locate derailed carriages while traveling at a constant speed, provides timely warnings when a carriage derails, and issues an alarm when the entire train derails, thus preventing damage to freight transport and even the safety of people's lives and property caused by train derailment.

[0022] 2. This invention can save the cost of high-tech testing instruments and labor costs. The device is simple to install, low in cost, and the calculation results are accurate. It solves the problems of time-consuming and labor-intensive manual testing, which is prone to errors, and the high cost of high-definition cameras. Attached Figure Description

[0023] Figure 1 This is a flowchart of the present invention;

[0024] Figure 2 This is a schematic diagram of the sound wave acquisition method of the present invention;

[0025] Figure 3 This is a schematic diagram of the acoustic wave acquisition device of the present invention;

[0026] Figure 4 This is a schematic diagram of the ranging principle of a three-element sonar array.

[0027] The diagram is labeled as follows: 1. Sound wave acquisition device; 11. First sound wave acquisition instrument; 12. Second sound wave acquisition instrument; 13. Third sound wave acquisition instrument; 2. Train. Detailed Implementation

[0028] In this embodiment, the flow of a train derailment acoustic detection method is as follows: Figure 1 As shown, the procedure is as follows:

[0029] Step 1, as follows Figure 2 As shown, a sound wave acquisition device 1 is installed on one side of the train track. The sound wave acquisition device 1 contains M sound wave acquisition instruments. In this embodiment, as shown... Figure 3 As shown, assume there are 3 sound wave acquisition devices; and the distance between any two adjacent sound wave acquisition devices is x.

[0030] Step 2: When the train approaches the sound wave acquisition device 1, the sound wave acquisition device begins to receive the sound wave signals generated by the train carriages and acquires the time t at which the sound wave signals generated by the i-th carriage of the n carriages traveling at a constant speed on the train track are obtained from the three sound wave acquisition devices. i1 ,t i2 ,…,t im ,…t iM ; where t im This represents the moment when the m-th sound wave acquisition device receives the sound wave signal generated by the i-th train carriage; in this embodiment, t im Take t i1 ,t i2 ,t i3 Assume the train has 5 carriages.

[0031] Step 3: The sound wave acquisition device 1 acquires the time when the signal reflected to the sound wave detector is received. Using the three-element sonar array ranging method, the location of the target is deduced by using the time it takes for the sound wave from the same target to reach the sound wave detector at three different locations. The principle is as follows: Figure 4 As shown, the three different locations are the positions of the first sound wave acquisition device 11, the second sound wave acquisition device 12, and the third sound wave acquisition device 13, respectively. The distance from the carriage to the first sound wave acquisition device 11 is X1, the distance to the second sound wave acquisition device 12 is X2, and the distance to the third sound wave acquisition device 13 is X3. The speed of sound propagation is v, t 12 t is the time difference between the arrival of the sound wave at the first sound wave acquisition device 11 and the second sound wave acquisition device 12. 23 Let X2 be the time difference between the arrival of the sound wave at the second sound wave acquisition device 12 and the third sound wave acquisition device 13, and let θ be the angle between the carriage and the second sound wave acquisition device 12. The distance X2 from the carriage to the second sound wave acquisition device 12 is the target distance X to be calculated. Then the following relationship holds:

[0032]

[0033] X2=X (2)

[0034]

[0035]

[0036]

[0037] Where: t1 is the time when the sound wave reaches the first sound wave acquisition device 11, t2 is the time when the sound wave reaches the second sound wave acquisition device 12, and t3 is the time when the sound wave reaches the third sound wave acquisition device 13. Combining equations (4) and (5) with equations (1) and (3), we get:

[0038]

[0039]

[0040] Rearranging and simplifying the above equation, we get:

[0041]

[0042]

[0043] Simplifying equations (8) and (9) together, we obtain equation (10). Using equation (10), we can derive the distance X between the acoustic wave acquisition device 1 and the i-th train car. i Relationship:

[0044]

[0045] In equation (10): v is the speed of sound propagation; t 12 t is the time difference between the arrival of the sound wave at the first sound wave acquisition device 11 and the second sound wave acquisition device 12. 23 The time difference between the arrival of the sound wave at the second sound wave acquisition instrument 12 and the third sound wave acquisition instrument 13;

[0046] Step 4: Calculate the distance X between the actual sound wave acquisition device and the train carriage based on Step 3. i Using equation (11), we can obtain the i-th train car at t i2 deviation at time a(t) i2 ):

[0047]

[0048] In equation (11): R i This represents the theoretical distance between the acoustic wave acquisition device and the i-th train car;

[0049] Step 5: Calculate the carriage deviation using equation (11), and then use equation (12) to obtain the overall deviation a(t) of the train at time t2. m ):

[0050] a(t2)=a(t 12 )+a(t 22 )+a(t 32 )+a(t 42 )+a(t 52 (12)

[0051] Step 6: If a(t2) is 0, it means the train has not derailed; if a(t2) is not 0, it means the train has derailed and the train applies emergency braking.

[0052] In this embodiment, an electronic device includes a memory and a processor. The memory stores a program that supports the processor in executing the above-described method, and the processor is configured to execute the program stored in the memory.

[0053] In this embodiment, a computer-readable storage medium stores a computer program, which is executed by a processor to perform the steps of the above method.

[0054] In summary, this invention can accurately calculate the distance between the sound wave acquisition device 1 and the train carriage, thereby determining the overall deviation of the train and whether the train has derailed during uniform speed travel. If derailment occurs, the derailed carriage can be located in time, and a warning can be issued in time when the carriage derails. When the entire train derails, an alarm can be set in time to ensure transportation safety.

Claims

1. A method for acoustic detection of train derailment, characterized in that, The procedure is as follows: Step 1: Install a sound wave acquisition device on one side of the train track. The sound wave acquisition device contains M sound wave acquisition instruments, and the distance between any two adjacent sound wave acquisition instruments is x. Step 2: Obtain the time t at which the sound wave signal is generated by the M sound wave acquisition devices in the i-th carriage of an n-carriage train moving at a constant speed on the train track. i1 ,t i2 ,…,t im ,…t iM ; where t im This indicates the moment when the m-th acoustic wave acquisition instrument receives the acoustic wave signal generated by the i-th train carriage; m∈[1,M]; Step 3: Use equation (1) to obtain the distance X between the sound wave acquisition device and the i-th train carriage. i Relationship: (1) In equation (1): v is the speed of sound propagation; t i(m-1)m t represents the time difference between the arrival of the sound wave generated by the i-th train carriage at the (m-1)-th sound wave acquisition device and the m-th sound wave acquisition device; im(m+1) The time difference between the arrival of the sound wave generated by the i-th train carriage at the m-th and (m+1)-th sound wave acquisition devices. Step 4: Use equation (2) to obtain the i-th train car at t im deviation at time a(t) im ): (2) In equation (2): R i This represents the theoretical distance between the sound wave acquisition device and the i-th train carriage; Step 5: Use equation (3) to obtain the train's position at t. m Overall deviation at time a(t) m ): (3) Step 6, if a(t) m If a(t) is 0, it means the train has not derailed. m If the value is not 0, it indicates that the train has derailed and the train applies emergency braking.

2. An electronic device, comprising a memory and a processor, characterized in that, The memory is used to store a program that supports the processor in executing the acoustic wave detection method of claim 1, and the processor is configured to execute the program stored in the memory.

3. A computer-readable storage medium storing a computer program, characterized in that, The computer program is executed by the processor to perform the steps of the acoustic wave detection method of claim 1.

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