A bogie health monitoring method, device and system

Abstract

This application relates to the field of health monitoring in rail transit, and discloses a method, device, and system for monitoring the health of a bogie. The method includes: acquiring the stress on the surface of a predetermined location on the main body of a composite bogie when deformation occurs; the predetermined location includes key parts of the main body and areas where the main body and components are connected by fasteners; determining the degree of damage to the main body; and predicting the remaining life of the composite bogie based on the stress and the degree of damage. Therefore, the health monitoring method in this application, by acquiring the stress on the surface of a predetermined location on the main body of the composite bogie and determining the degree of damage to the bogie main body, and then predicting the remaining life of the composite bogie based on the degree of damage and the acquired stress, ensures the structural safety of the composite bogie and reduces maintenance costs.

Description

Technical Field

[0001] This application relates to the field of health monitoring in rail transit, and in particular to a method, device and system for monitoring the health of bogies. Background Technology

[0002] To meet the requirements of lightweight, low cost, and high strength, traditional bogies are being replaced with composite material bogies, such as carbon fiber reinforced composite bogies. The main components of the bogie can be made of carbon fiber reinforced composites, titanium alloys, stainless steel, etc., integrating multiple materials in different parts to reduce manufacturing costs and effectively reduce weight. To understand the health status of the bogie, health monitoring can be performed. Current health monitoring methods can monitor stress and damage to the bogie, but they cannot predict the remaining lifespan of the bogie.

[0003] Therefore, how to solve the above-mentioned technical problems should be a key focus for those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide a bogie health monitoring method, apparatus, and system for predicting the remaining life of the bogie.

[0005] To address the aforementioned technical problems, this application provides a bogie health monitoring method, comprising:

[0006] The stress on the surface of a predetermined part of the main body of the composite bogie is obtained when deformation occurs; the predetermined part includes key parts of the main body and areas where the main body and components are connected by fasteners;

[0007] Determine the extent of damage to the subject;

[0008] The remaining life of the composite bogie is predicted based on the stress and the degree of damage.

[0009] Optionally, predicting the remaining life of the composite bogie based on the stress and the degree of damage includes:

[0010] Obtain the time when the damage occurred;

[0011] Determine the difference between the stated degree of damage and the maximum permissible degree of damage;

[0012] The ratio of the difference in the degree of damage to the degree of damage is used to determine the undetermined ratio of the remaining lifespan to the time.

[0013] Based on the ratio of the expected stress to be borne by the preset part to the stress, the undetermined ratio is revised to obtain the final ratio of the remaining lifespan to the time.

[0014] The remaining lifetime is determined based on the final ratio and the time.

[0015] Optional, also includes:

[0016] Determine the ratio of the stress to the preset stress threshold;

[0017] Determine whether the ratio is greater than a preset ratio threshold;

[0018] If the ratio is greater than the preset ratio threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

[0019] Optional, also includes:

[0020] Determine whether the stress is greater than a preset stress threshold;

[0021] If the stress exceeds the preset stress threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

[0022] Optional, also includes:

[0023] When the driver emits stress waves toward the main body, it acquires electrical signals corresponding to the stress waves transmitted to the surface and interior of the key parts.

[0024] The electrical signal is compared with a reference signal; the reference signal is the electrical signal when the main body is undamaged.

[0025] Based on the comparison result between the electrical signal and the reference signal, it is determined whether the main body has been damaged.

[0026] Optionally, determining the degree of damage to the subject includes:

[0027] Determine the amplitude difference between the electrical signal and the reference signal;

[0028] The degree of damage is determined based on the amplitude difference, the preset amplitude, and the correspondence between the degree of damage.

[0029] This application also provides a bogie health monitoring device, comprising:

[0030] The first acquisition module is used to acquire the stress on the surface of a preset part of the main body of the composite bogie when deformation occurs; the preset part includes the key part of the main body and the area where the main body and components are connected by fasteners;

[0031] The first determining module is used to determine the degree of damage to the main body;

[0032] A prediction module is used to predict the remaining life of the composite bogie based on the stress and the degree of damage.

[0033] This application also provides a bogie health monitoring system, including: a controller and a fiber Bragg grating sensor connected to the controller;

[0034] The controller is used to implement any of the bogie health monitoring methods described above;

[0035] The fiber optic grating sensor is installed on a predetermined part of the main body of the composite bogie and is used to measure the stress when the predetermined part undergoes deformation; the predetermined part includes key parts of the main body and areas where the main body and components are connected by fasteners.

[0036] Optional, also includes:

[0037] A driver for transmitting stress waves to the critical parts of the body;

[0038] A piezoelectric sensor connected to the controller is used to sense the stress waves transmitted to the surface and interior of the critical part, and to convert the sensed stress waves into electrical signals.

[0039] Optional, also includes:

[0040] An ultrasonic waveguide controller connected to the driver is used to control the frequency and energy of the stress waves emitted by the driver.

[0041] This application provides a bogie health monitoring method, comprising: acquiring the stress on the surface of a predetermined part of the main body of a composite bogie when deformation occurs; the predetermined part includes key parts of the main body and areas where the main body and components are connected by fasteners; determining the degree of damage to the main body; and predicting the remaining life of the composite bogie based on the stress and the degree of damage.

[0042] As can be seen, the health monitoring method in this application obtains the stress on the surface of a preset part on the main body of the composite bogie and determines the degree of damage to the main body of the bogie. Based on the degree of damage to the main body and the obtained stress, it can predict the remaining life of the composite bogie, so as to ensure the structural safety of the composite bogie and reduce maintenance costs.

[0043] In addition, this application also provides an apparatus and system that have the above advantages. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A flowchart illustrating a bogie health monitoring method provided in this application embodiment;

[0046] Figure 2 This is a structural schematic diagram of a composite material bogie provided in an embodiment of this application.

[0047] Figure 3 This is a partial schematic diagram of the connection area between the main body and components in a composite material bogie provided in an embodiment of this application;

[0048] Figure 4 A flowchart of a bogie health monitoring and early warning method provided in an embodiment of this application;

[0049] Figure 5 This is a flowchart of another bogie health monitoring and early warning method provided in an embodiment of this application;

[0050] Figure 6 This is a structural block diagram of a bogie health monitoring device provided in an embodiment of this application;

[0051] Figure 7 This is a structural block diagram of a bogie health monitoring system provided in an embodiment of this application. Detailed Implementation

[0052] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0054] As described in the background section, current health monitoring can monitor the stress and damage to the bogie, but it cannot predict the remaining life of the bogie.

[0055] In view of this, this application provides a bogie health monitoring method, please refer to... Figure 1 ,include:

[0056] Step S101: Obtain the stress on the surface of a preset part of the main body of the composite bogie when deformation occurs; the preset part includes the key part of the main body and the area where the main body and components are connected by fasteners.

[0057] The process of determining the key parts of the composite bogie body can be as follows: simulate the stress of each part of the composite bogie body using a stress simulation model to obtain the stress of each part; select the first certain percentage (e.g., the first 20%, or the first 30%) of the stress according to the stress magnitude, and then set the parts corresponding to these stresses as key parts; or, screen out the stresses that exceed the preset stress threshold, and then set the parts corresponding to these stresses as key parts.

[0058] A schematic diagram of the composite material bogie structure is shown below. Figure 2 As shown, the assembly includes a carbon fiber reinforced composite body 11 and various mounting bases connected to the body. The mounting bases include components 12 made of various materials, including fiber reinforced composite materials and metals such as low-alloy structural steel, stainless steel, and titanium alloys. The body and various mounting bases are assembled using a modular molding and connection process. The connection methods between the components and the body include bonding and fastener connection, among which fastener connection includes bolt connection, riveting connection, and a combination of riveting and bolt connection.

[0059] This application collects stress in the area where component 12 and body 11 are connected by fasteners. The fasteners include, but are not limited to, bolts and rivets.

[0060] When both riveting and bolting are used to connect the metal component 12 and the fiber-reinforced composite material body 11, the component 12 and the body 11 in the riveting connection area are connected by means of... Figure 3 The structure is bonded with adhesive as shown.

[0061] It should be noted that this application does not limit the frequency of obtaining the stress on the surface of the preset part of the main body. For example, the stress on the surface of the preset part of the main body can be obtained in real time, or the stress on the surface of the preset part of the main body can be obtained according to a certain preset cycle.

[0062] Step S102: Determine the degree of damage to the main body.

[0063] Step S103: Predict the remaining life of the composite bogie based on the stress and the degree of damage.

[0064] Optionally, as one possible implementation, predicting the remaining life of the composite bogie based on the stress and the degree of damage includes:

[0065] Step S1031: Obtain the time when the damage occurred.

[0066] Types of damage include, but are not limited to, cracks and delamination.

[0067] Step S1032: Determine the difference between the damage degree and the maximum allowable damage degree.

[0068] The damage degree difference is equal to the maximum allowable damage degree minus the current damage degree. For example, when the damage is a crack, if the current damage degree is a crack length of m, and the maximum allowable damage degree is a crack length of n, where n > m, then the damage degree difference is nm.

[0069] Step S1033: Determine the undetermined ratio of the remaining lifespan to the time based on the ratio of the difference in the degree of damage to the degree of damage.

[0070] The undetermined ratio of remaining lifespan to time of damage is equal to the ratio of the difference in damage severity to the degree of damage.

[0071] Step S1034: Based on the ratio of the expected stress to be borne by the preset part to the stress, revise the undetermined ratio to obtain the final ratio of the remaining lifespan to the time.

[0072] According to the damage consistency theory, the remaining life of a composite bogie is related to the magnitude of the stress subsequently borne. Therefore, it needs to be determined based on the ratio of the expected stress borne at a predetermined location to the stress already borne. Thus, this application uses the ratio of the expected stress borne at a predetermined location to the stress to revise the determined ratio, obtaining a more accurate final ratio of remaining life to time.

[0073] Step S1035: Determine the remaining lifetime based on the final ratio and the time.

[0074] Remaining lifespan equals the time since the damage occurred multiplied by the final ratio.

[0075] The health monitoring method in this application obtains the stress on the surface of a preset part on the main body of the composite bogie and determines the degree of damage to the main body of the bogie. Based on the degree of damage to the main body and the obtained stress, the remaining life of the composite bogie is predicted.

[0076] Based on the above embodiments, in one embodiment of this application, the bogie health monitoring method can also provide early warning of damage to composite material bogies. There are two ways to provide early warning, which will be described below.

[0077] As one possible implementation method, please refer to Figure 4 Early warning methods include:

[0078] Step S201: Determine the ratio of the stress to the preset stress threshold.

[0079] It should be noted that this application does not limit the preset stress threshold, which can be set by the user.

[0080] Step S202: Determine whether the ratio is greater than a preset ratio threshold.

[0081] Step S203: If the ratio is greater than the preset ratio threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

[0082] It is understandable that when the ratio of stress to the preset stress threshold is less than or equal to the preset ratio threshold, no alarm command needs to be sent, that is, no warning is issued.

[0083] As another possible implementation method, please refer to Figure 5 Early warning methods include:

[0084] Step S301: Determine whether the stress is greater than a preset stress threshold.

[0085] It should be noted that this application does not limit the preset stress threshold, which can be set by the user.

[0086] Step S302: If the stress is greater than the preset stress threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

[0087] Understandably, when the stress is less than or equal to the preset stress threshold, no alarm command needs to be sent, i.e., no warning is issued.

[0088] This application acquires the stress on the surface of a predetermined location on the main body of the composite bogie, and then provides early warnings about the health status of the composite bogie based on the stress magnitude, thereby achieving health monitoring of the composite bogie. Furthermore, this application can also acquire the stress in the connection area between the main body and components, enabling monitoring of the fasteners in this connection area, i.e., monitoring the fastener connection status, solving the problem of difficulty in monitoring the connection status, and thus achieving monitoring of loosening faults in the connection structure of the composite bogie.

[0089] Based on any of the above embodiments, in one embodiment of this application, the bogie health monitoring method further includes:

[0090] When the driver emits stress waves toward the main body, it acquires electrical signals corresponding to the stress waves transmitted to the surface and interior of the key parts.

[0091] The electrical signal is compared with a reference signal; the reference signal is the electrical signal when the main body is undamaged.

[0092] Based on the comparison result between the electrical signal and the reference signal, it is determined whether the main body has been damaged.

[0093] When the drive unit emits stress waves into the composite bogie body, the stress waves propagate within the composite bogie body. The electrical signal is obtained by sensing the stress waves propagating within the composite bogie body through a piezoelectric sensor and converting the sensed stress waves.

[0094] The process of obtaining the reference signal includes: transmitting stress waves to the undamaged composite bogie body through a driver, then using a piezoelectric sensor to sense the stress waves propagating in the undamaged body, and converting the sensed stress waves into an electrical signal, thus obtaining the reference signal.

[0095] When the obtained electrical signal is the same as or has a similarity to the reference signal that reaches a preset threshold, it can be considered that the subject has not been damaged; otherwise, it is considered that the subject has been damaged.

[0096] The electrical signals in this application include not only the electrical signals on the surface of key parts of the composite bogie body, but also the electrical signals inside the key parts, which overcomes the problem that the internal condition of the bogie is not easy to observe and improves the accuracy of damage monitoring of composite bogies.

[0097] Optionally, in one embodiment of this application, determining the degree of damage to the subject includes:

[0098] Determine the amplitude difference between the electrical signal and the reference signal;

[0099] The degree of damage is determined based on the amplitude difference, the preset amplitude, and the correspondence between the degree of damage.

[0100] Amplitude difference refers to the difference in amplitude between the electrical signal corresponding to the stress wave transmitted on the surface and inside of the critical part and the reference signal in the difference region.

[0101] The method for determining the correspondence between the preset amplitude and the degree of damage can be as follows: stress waves are emitted in advance to composite bogie bodies with different degrees of damage and without damage, and electrical signals corresponding to the stress waves propagating in each composite bogie body are obtained. Then, the amplitude difference between the electrical signals of the bodies with different degrees of damage and the electrical signals of the bodies without damage is determined. Thus, the correspondence between the amplitude and the degree of damage is determined based on each amplitude difference and the corresponding degree of damage.

[0102] The health monitoring method in this application will be described below using a specific example.

[0103] Step 1: Real-time acquisition of stress on the surface of a predetermined part of the main body of the composite bogie when deformation occurs; the predetermined part includes key parts of the main body and areas where the main body and components are connected by fasteners;

[0104] Step 2: Determine the ratio of the stress obtained in Step 1 to the preset stress threshold;

[0105] Step 3: Determine whether the ratio is greater than the preset ratio threshold;

[0106] Step 4: If the ratio is greater than the preset ratio threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

[0107] Step 5: If the ratio is less than or equal to the preset ratio threshold, no warning will be issued;

[0108] Step 6: Use the driver to emit stress waves to the main body and obtain the electrical signals corresponding to the stress waves transmitted on the surface and inside the key parts of the main body;

[0109] Step 7: Compare the obtained electrical signal with the reference signal;

[0110] Step 8: If the similarity between the electrical signal and the reference signal reaches a preset threshold, it is determined that the subject has not been damaged.

[0111] Step 9: If the similarity between the electrical signal and the reference signal does not reach the preset threshold, then it is determined that the main body is damaged.

[0112] Step 10: Determine the amplitude difference between the electrical signal and the reference signal;

[0113] Step 11: Determine the degree of damage to the main body based on the amplitude difference, the preset amplitude and the correspondence between the degree of damage;

[0114] Step 12: Determine the difference between the degree of damage and the maximum allowable degree of damage;

[0115] Step 13: Obtain the time when the main body was damaged;

[0116] Step 14: Determine the undetermined ratio of remaining lifespan to the time of damage based on the ratio of the difference in damage severity to the damage severity.

[0117] Step 15: Based on the ratio of the expected stress to the preset location, revise the pending ratio to obtain the final ratio of remaining life to time.

[0118] Step 16: Determine the remaining lifespan based on the final ratio and the time when the damage occurred.

[0119] The bogie health monitoring device provided in the embodiments of the present invention will be described below. The bogie health monitoring device described below can be referred to in correspondence with the bogie health monitoring method described above. Please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a structural block diagram of a bogie health monitoring device provided in an embodiment of this application. The device includes:

[0120] The first acquisition module 100 is used to acquire the stress on the surface of a preset part of the main body of the composite bogie when deformation occurs; the preset part includes the key part of the main body and the area where the main body and components are connected by fasteners;

[0121] The first determining module 200 is used to determine the degree of damage to the main body;

[0122] The prediction module 300 is used to predict the remaining life of the composite bogie based on the stress and the degree of damage.

[0123] The bogie health monitoring device in this embodiment is used to implement the aforementioned bogie health monitoring method. Therefore, the specific implementation of the bogie health monitoring device can be found in the embodiment section of the bogie health monitoring method above. For example, the first acquisition module 100, the first determination module 200, and the prediction module 300 are respectively used to implement steps S101, S102, and S103 in the above bogie health monitoring method. Therefore, the specific implementation can be referred to the description of the corresponding embodiments, which will not be repeated here.

[0124] Optionally, the prediction module 300 includes:

[0125] The acquisition unit is used to acquire the time when the damage occurred.

[0126] The first determining unit is used to determine the difference between the degree of damage and the maximum allowable degree of damage.

[0127] The second determining unit is used to determine the undetermined ratio of the remaining lifespan to the time based on the ratio of the damage degree difference to the damage degree.

[0128] The revision unit is used to revise the undetermined ratio based on the ratio of the expected stress to be borne by the preset part to the stress, so as to obtain the final ratio of the remaining life to the time.

[0129] The third determining unit is used to determine the remaining lifetime based on the final ratio and the time.

[0130] Optional, also includes:

[0131] The second determining module is used to determine the ratio of the stress to a preset stress threshold.

[0132] The first judgment module is used to determine whether the ratio is greater than a preset ratio threshold.

[0133] The first sending module is used to send an alarm command to the alarm device if the ratio is greater than the preset ratio threshold, so that the alarm device can issue an alarm message.

[0134] Optional, also includes:

[0135] The second judgment module is used to determine whether the stress is greater than a preset stress threshold.

[0136] The second sending module is used to send an alarm command to the alarm device if the stress is greater than the preset stress threshold, so that the alarm device can issue an alarm message.

[0137] Optional, also includes:

[0138] The second acquisition module is used to acquire electrical signals corresponding to the stress waves transmitted on the surface and inside the key parts when the driver emits stress waves to the body.

[0139] The comparison module is used to compare the electrical signal with a reference signal; the reference signal is the electrical signal when the main body is undamaged.

[0140] The third judgment module is used to determine whether the main body has been damaged based on the comparison result between the electrical signal and the reference signal.

[0141] Optionally, the first determining module 200 includes:

[0142] The third determining unit is used to determine the amplitude difference between the electrical signal and the reference signal;

[0143] The fourth determining unit is used to determine the degree of damage based on the amplitude difference, the preset amplitude and the correspondence between the degree of damage.

[0144] Please see Figure 7 This application also provides a bogie health monitoring system, including: a controller 2 and a fiber optic grating sensor 3 connected to the controller 2;

[0145] The controller 2 is used to implement the bogie health monitoring method described in any of the above embodiments;

[0146] The fiber optic grating sensor 3 is disposed on a predetermined part of the main body of the composite bogie 1 and is used to measure the stress when the predetermined part undergoes deformation; the predetermined part includes the key part of the main body and the area where the main body and components are connected by fasteners.

[0147] Based on the above embodiments, in one embodiment of this application, the bogie health monitoring system further includes:

[0148] Driver 5 is used to emit stress waves to the key parts of the main body;

[0149] The piezoelectric sensor 4, connected to the controller 2, is used to sense the stress waves transmitted to the surface and interior of the critical part, and to convert the sensed stress waves into electrical signals.

[0150] Among them, the piezoelectric sensor 4 is disposed on the surface of the key part of the main body and embedded in the inside of the key part. For example, when embedded inside, the piezoelectric sensor 4 can be disposed between the carbon fiber layers or inside the carbon fiber of the key part of the main body of the carbon fiber reinforced composite bogie 1.

[0151] In this embodiment, the surface-mount and embedded configuration of the piezoelectric sensor 4 overcomes the problem of difficulty in observing the condition of composite bogie components, thereby achieving damage monitoring. The embedded design allows the piezoelectric sensor to be pre-positioned at a predetermined location inside the composite bogie structure before the main body is formed, between fibers or between fiber layers, achieving the goal of precise positioning of the test sensor without damaging the structure.

[0152] Based on the above embodiments, in one embodiment of this application, the bogie health monitoring system further includes:

[0153] An ultrasonic waveguide controller 6 connected to the driver is used to control the frequency and energy of the stress waves emitted by the driver 4.

[0154] By adopting an active monitoring method, an electrical signal is applied to the driver 4 through the ultrasonic guided wave controller 6 to control the frequency and energy of the stress wave emitted by the driver 4, so that the driver 4 generates a stress wave.

[0155] Based on the above embodiments, in one embodiment of this application, the bogie health monitoring system further includes:

[0156] The high-speed demodulator 7, connected to the driver, is used to convert the stress wave emitted by the driver 4 into a displayable electrical signal graphic so that monitoring personnel can observe the emitted stress wave.

[0157] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0158] The bogie health monitoring method, device, and system provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A bogie health monitoring method, characterized in that, include: The stress on the surface of a predetermined part of the main body of the composite bogie is obtained when deformation occurs; the predetermined part includes key parts of the main body and areas where the main body and components are connected by fasteners; Determine the extent of damage to the subject; The remaining life of the composite bogie is predicted based on the stress and the degree of damage. Predicting the remaining life of the composite bogie based on the stress and the degree of damage includes: Obtain the time when the damage occurred; Determine the difference between the stated degree of damage and the maximum permissible degree of damage; The ratio of the difference in the degree of damage to the degree of damage is used to determine the undetermined ratio of the remaining lifespan to the time. Based on the ratio of the expected stress to be borne by the preset part to the stress, the undetermined ratio is revised to obtain the final ratio of the remaining lifespan to the time. The remaining lifetime is determined based on the final ratio and the time. When the driver emits stress waves toward the main body, it acquires electrical signals corresponding to the stress waves transmitted to the surface and interior of the key parts. The electrical signal is compared with a reference signal; the reference signal is the electrical signal when the main body is undamaged. Based on the comparison result between the electrical signal and the reference signal, it is determined whether the main body has been damaged; Determining the extent of damage to the subject includes: Determine the amplitude difference between the electrical signal and the reference signal; The degree of damage is determined based on the amplitude difference, the preset amplitude, and the correspondence between the degree of damage.

2. The bogie health monitoring method as described in claim 1, characterized in that, Also includes: Determine the ratio of the stress to the preset stress threshold; Determine whether the ratio is greater than a preset ratio threshold; If the ratio is greater than the preset ratio threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

3. The bogie health monitoring method as described in claim 1, characterized in that, Also includes: Determine whether the stress is greater than a preset stress threshold; If the stress exceeds the preset stress threshold, an alarm command is sent to the alarm device so that the alarm device can issue an alarm message.

4. A bogie health monitoring device, characterized in that, include: The first acquisition module is used to acquire the stress on the surface of a preset part of the main body of the composite bogie when deformation occurs; the preset part includes the key part of the main body and the area where the main body and components are connected by fasteners; The first determining module is used to determine the degree of damage to the main body; A prediction module is used to predict the remaining life of the composite bogie based on the stress and the degree of damage. The prediction module includes: The acquisition unit is used to acquire the time when the damage occurred. The first determining unit is used to determine the difference between the degree of damage and the maximum allowable degree of damage. The second determining unit is used to determine the undetermined ratio of the remaining lifespan to the time based on the ratio of the damage degree difference to the damage degree. The revision unit is used to revise the undetermined ratio based on the ratio of the expected stress to be borne by the preset part to the stress, so as to obtain the final ratio of the remaining life to the time. The third determining unit is used to determine the remaining lifetime based on the final ratio and the time. The second acquisition module is used to acquire electrical signals corresponding to the stress waves transmitted on the surface and inside the key parts when the driver emits stress waves to the body. The comparison module is used to compare the electrical signal with a reference signal; the reference signal is the electrical signal when the main body is undamaged. The third judgment module is used to determine whether the main body has been damaged based on the comparison result between the electrical signal and the reference signal. The first determination module includes: The third determining unit is used to determine the amplitude difference between the electrical signal and the reference signal; The fourth determining unit is used to determine the degree of damage based on the amplitude difference, the preset amplitude and the correspondence between the degree of damage.

5. A bogie health monitoring system, characterized in that, include: Controller and fiber Bragg grating sensor connected to the controller; The controller is used to implement the bogie health monitoring method as described in any one of claims 1 to 3; The fiber optic grating sensor is installed on a predetermined part of the main body of the composite bogie and is used to measure the stress when the predetermined part undergoes deformation; the predetermined part includes key parts of the main body and areas where the main body and components are connected by fasteners.

6. The bogie health monitoring system as described in claim 5, characterized in that, Also includes: A driver for transmitting stress waves to the critical parts of the body; A piezoelectric sensor connected to the controller is used to sense the stress waves transmitted to the surface and interior of the critical part, and to convert the sensed stress waves into electrical signals.

7. The bogie health monitoring system as described in claim 6, characterized in that, Also includes: An ultrasonic waveguide controller connected to the driver is used to control the frequency and energy of the stress waves emitted by the driver.

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