Health Monitoring Method, Device, and System for a Trolley

Abstract

A method, apparatus and system for health monitoring of a bogie, comprising the steps of: obtaining stress when the surface of a preset part on the body of a composite material bogie is deformed, wherein the preset part includes an important part of the body and an area where the body and components are connected by fasteners; identifying the degree of damage of the body; and predicting the remaining life of the composite material bogie according to the stress and the degree of damage. Thus, the health monitoring method in the present application obtains the stress on the surface of a preset part on the body of a composite material bogie, identifies the degree of damage of the body of the bogie, and realizes the prediction of the remaining life of the composite material bogie according to the degree of damage of the body and the obtained stress, thereby ensuring the safety of the structure of the composite material bogie and reducing the maintenance cost.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on February 21, 2023, with the application number 202310146524.0 and the invention title "Truck Health Monitoring Method, Device and System", and all its contents are incorporated herein by reference.

[0002] This application relates to the field of railway transportation health monitoring, and particularly to a truck health monitoring method, device and system.

Background Art

[0003] In order for the truck to meet the requirements of being lightweight, low-cost and high-strength, the conventional truck is updated to a composite material truck, for example, a carbon fiber reinforced composite material truck. The main components of the truck can adopt carbon fiber reinforced composite materials, titanium alloys, stainless steel, etc. By integrating various materials in different parts, the manufacturing cost can be reduced and the weight can be effectively reduced. In order to understand the health status of the truck, health monitoring can be performed on the truck. In the current health monitoring, the stress and damage of the truck can be monitored, but the current health monitoring cannot realize predicting the remaining life of the truck.

[0004] Therefore, how to solve the above technical problems should be the focus of those skilled in the art.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The purpose of this application is to provide a truck health monitoring method, device and system so as to predict the remaining life of the truck.

Means for Solving the Problems

[0006] In order to solve the above technical problems, this application provides a truck health monitoring method, A step of obtaining stress when the surface of a preset part on the main body of the composite material carriage is deformed, wherein the preset part includes an important part of the main body and an area where the main body and the parts are connected by fasteners; A step of specifying the degree of damage of the main body; A step of predicting the remaining life of the composite material carriage according to the stress and the degree of damage, including:

[0007] Optionally, The step of predicting the remaining life of the composite material carriage according to the stress and the degree of damage includes: A step of obtaining the time when damage appears; A step of specifying the damage degree difference between the degree of damage and the maximum allowable degree of damage; A step of specifying an undetermined ratio between the remaining life and the time according to the ratio of the damage degree difference to the degree of damage; A step of correcting the undetermined ratio according to the ratio of the stress that the preset part is expected to receive to the stress, and obtaining the final ratio between the remaining life and the time; A step of specifying the remaining life according to the final ratio and the time, including:

[0008] Optionally, A step of specifying the proportion of the stress to a preset stress threshold; A step of determining whether the proportion is greater than a preset proportion threshold; If the proportion is greater than the preset proportion threshold, a step of sending an alarm command to the alarm device so that the alarm device sends alarm information is further included.

[0009] Optionally, A step of determining whether the stress is greater than a preset stress threshold; If the stress is greater than the preset stress threshold, a step of sending an alarm command to the alarm device so that the alarm device sends alarm information is further included.

[0010] Optionally, when the driver transmits a stress wave to the main body, obtaining an electrical signal corresponding to the stress wave transmitted to the surface and inside of the important part, comparing the electrical signal with a reference signal, wherein the reference signal is an electrical signal when there is no damage to the main body, further including determining whether the main body is damaged according to a comparison result between the electrical signal and the reference signal.

[0011] Optionally, the step of identifying the degree of damage to the main body includes identifying an amplitude difference between the electrical signal and the reference signal, and identifying the degree of damage according to the amplitude difference and a correspondence relationship between a preset amplitude and the degree of damage.

[0012] This application further provides a health monitoring device for a trolley, a first acquisition module for acquiring stress when the surface of a preset part on the main body of a composite material trolley is deformed, where the preset part includes an important part of the main body and an area where the main body and components are connected by fasteners, a first identification module for identifying the degree of damage to the main body, and a prediction module for predicting the remaining life of the composite material trolley according to the stress and the degree of damage.

[0013] This application further provides a health monitoring system for a trolley, including a controller and a fiber grating sensor connected to the controller, wherein the controller is used to implement the health monitoring method for a trolley according to any one of the above. The fiber grating sensor is provided on the surface of a preset part in the main body of the composite material bogie and is used to measure the stress when the preset part is deformed. The preset part includes important parts of the main body and regions where the main body and components are connected by fasteners.

[0014] Optionally, a driver for transmitting a stress wave to the important part of the main body, a piezoelectric sensor connected to the controller for sensing the stress wave transmitted to the surface and inside of the important part and converting the sensed stress wave into an electrical signal are further included.

[0015] Optionally, an ultrasonic guided wave controller connected to the driver for controlling the frequency and energy of the stress wave transmitted by the driver is further included.

[0016] The bogie health monitoring method provided by this application includes steps of obtaining stress when the surface of a preset part in the main body of the composite material bogie is deformed, where the preset part includes important parts of the main body and regions where the main body and components are connected by fasteners, identifying the degree of damage of the main body, and predicting the remaining life of the composite material bogie according to the stress and the degree of damage.

[0017] In this way, the health monitoring method in this application obtains the stress on the surface of a preset part in the main body of the composite material bogie and identifies the degree of damage of the main body of the bogie, so as to realize the prediction of the remaining life of the composite material bogie according to the degree of damage of the main body and the obtained stress, thereby ensuring the structural safety of the composite material bogie and reducing the maintenance cost.

[0018] Furthermore, this application further provides a device and a system having the above advantages.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following briefly introduces the drawings necessary for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. Those skilled in the art can obtain other drawings according to these drawings on the premise of not performing labor worthy of inventive step.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0021] To enable those skilled in the art to better understand the solution of this application, the following combines the drawings with specific embodiments to describe this application in detail. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative labor shall fall within the protection scope of this application.

[0022] In the following description, many specific details are set forth in order to facilitate a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein, and may be modified by those skilled in the art without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] As described in the background art section, in current health monitoring, the stress and damage of the bogie can be monitored, but the current health monitoring cannot realize predicting the remaining life of the bogie.

[0024] In view of this, the present application provides a method for monitoring the health of a bogie, which includes steps S101 to S103 with reference to FIG. 1. Step S101: Obtain the stress when the surface of a preset part on the main body of the composite material bogie is deformed. The preset part includes important parts of the main body and areas where the main body and components are connected by fasteners.

[0025] The process of identifying important parts of the main body of the composite material bogie may be as follows. That is, through a stress simulation model, simulate the stress of each part of the main body of the composite material bogie to obtain the stress of each part, and take out the stress of the first certain ratio (for example, the first 20% or the first 30%, etc.) according to the magnitude of the stress, and the parts corresponding to these stresses can be set as important parts, or select the stress exceeding a preset stress threshold, and set the parts corresponding to these stresses as important parts.

[0026] As shown in FIG. 2, the structural schematic diagram of the composite material trolley includes a main body 11 of carbon fiber reinforced composite material and various mounting seats connected to the main body. The mounting seats include components 12 made of various materials, including fiber reinforced composite materials and metal materials such as low alloy structural steel, stainless steel, and titanium alloy. The main body and various mounting seats adopt split molding and connection assembly. The connection methods between the components and the main body include adhesion, connection by fasteners, etc. The connection by fasteners includes connection by bolts, connection by rivets, and connection by rivets + bolts.

[0027] In the present application, the stress in the region where the component 12 and the main body 11 are connected by fasteners is collected. The fasteners include, but are not limited to, bolts and rivets.

[0028] When both rivet connection and bolt connection are adopted between the component 12 of metal material and the main body 11 of fiber reinforced composite material, the component 12 and the main body 11 in the rivet connection region are adhered with a structural adhesive as shown in FIG. 3.

[0029] In addition, in the present application, the frequency of obtaining the stress on the surface of the preset part of the main body is not limited. 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.

[0030] Step S102: Identify the degree of damage of the main body.

[0031] Step S103: Predict the remaining life of the composite material trolley according to the stress and the degree of damage.

[0032] Alternatively, as an implementable form, the step of predicting the remaining life of the composite material trolley according to the stress and the degree of damage includes steps S1031 to S1035. Step S1031: Obtain the time when the damage appears.

[0033] The types of damage include, but are not limited to, cracks and delamination.

[0034] Step S1032: Identify the difference in the degree of damage between the degree of damage and the maximum allowable degree of damage.

[0035] The difference in the degree of damage is equal to the maximum allowable degree of damage minus the degree of damage that has already appeared. For example, when the damage is a crack, the degree of damage that has already appeared is that the length of the crack is equal to m, the maximum allowable degree of damage is that the length of the crack is equal to n, and if n > m, the difference in the degree of damage is n - m.

[0036] Step S1033: Identify the undetermined ratio between the remaining life and the time according to the ratio of the difference in the degree of damage to the degree of damage.

[0037] The undetermined ratio between the remaining life and the time when the damage appears is equal to the ratio of the difference in the degree of damage to the degree of damage.

[0038] Step S1034: Modify the undetermined ratio according to the ratio of the stress that the preset part is expected to receive to the stress, and obtain the final ratio between the remaining life and the time.

[0039] As can be seen from the damage consistency theory, the remaining life of the composite material bogie is related to the magnitude of the stress to be received subsequently. Therefore, it is necessary to determine according to the ratio of the stress that the preset part is expected to receive to the stress that has already been received. Therefore, this application uses the ratio of the stress that the preset part is expected to receive to the stress to modify the undetermined ratio and obtain the final ratio between the remaining life and the time that is more accurately determined.

[0040] Step S1035: Identify the remaining life according to the final ratio and the time.

[0041] The remaining life is equal to the time when the damage has already appeared multiplied by the final ratio.

[0042] The health monitoring method in this application realizes the prediction of the remaining life of the composite material bogie by obtaining the stress on the surface of a preset part on the main body of the composite material bogie and identifying the degree of damage to the main body of the bogie, and further according to the degree of damage to the main body and the obtained stress.

[0043] Based on the above embodiments, in one embodiment of this application, the health monitoring method of the bogie can further give an early warning of the damage to the composite material bogie. There may be two types of early warning methods, which are introduced respectively below.

[0044] As a feasible form, referring to FIG. 4, the early warning method includes steps S201 to S203. Step S201: Identify the ratio between the stress and a preset stress threshold.

[0045] Note that in this application, the preset stress threshold is not limited and can be set by oneself.

[0046] Step S202: Determine whether the ratio is greater than a preset ratio threshold.

[0047] Step S203: If the ratio is greater than the preset ratio threshold, send an alarm command to the alarm device so that the alarm device sends alarm information.

[0048] As can be understood, when the ratio between the stress and the preset stress threshold is less than or equal to the preset ratio threshold, there is no need to send an alarm command, that is, no early warning is given.

[0049] As another feasible form, referring to FIG. 5, the early warning method includes steps S301 to S302. Step S301: Determine whether the stress is greater than a preset stress threshold.

[0050] Note that in this application, the preset stress threshold is not limited and can be set by oneself.

[0051] Step S302: If the stress is greater than the preset stress threshold value, send an alarm command to the alarm device so that the alarm device transmits alarm information.

[0052] As can be understood, when the stress is below the preset stress threshold value, there is no need to send an alarm command, that is, no early warning is performed.

[0053] In the present application, the stress on the surface of a preset part in the main body of the composite material carriage is acquired, and further, early warning is performed on the health status of the composite material carriage according to the magnitude of the stress, thereby realizing health monitoring of the composite material carriage. Moreover, the present application can further acquire the stress in the connection area between the main body and the parts, and realize the monitoring of the fasteners in the connection area between the main body and the parts, that is, realize the monitoring of the connection state of the fasteners, solve the problem that it is difficult to monitor the connection state, and further achieve the monitoring of the rattling failure of the connection structure of the composite material carriage.

[0054] Based on any of the above embodiments, in one embodiment of the present application, the method for monitoring the health of the carriage is When the driver transmits a stress wave to the main body, the step of acquiring an electrical signal corresponding to the stress wave transmitted to the surface and inside of the important part, and The step of comparing the electrical signal with a reference signal, where the reference signal is the electrical signal when there is no damage to the main body, and According to the comparison result between the electrical signal and the reference signal, the step of determining whether the main body is damaged is further included.

[0055] When the driver transmits a stress wave to the main body of the composite material carriage and the stress wave propagates inside the composite material carriage, the electrical signal is obtained by the piezoelectric sensor sensing the stress wave propagating inside the composite material carriage and converting the sensed stress wave.

[0056] The process of obtaining the reference signal includes transmitting a stress wave to the body of the undamaged composite material bogie by a driver, and then using a piezoelectric sensor to sense the stress wave propagating in the undamaged body, and converting the sensed stress wave into an electrical signal, that is, obtaining the reference signal.

[0057] When the obtained electrical signal is the same as the reference signal or the similarity reaches a preset threshold value, it can be considered that the body is not damaged; otherwise, it is considered that the body is damaged.

[0058] In this application, the electrical signal not only includes the electrical signal on the surface of the important part of the body of the composite material bogie, but also further includes the electrical signal inside the important part, overcoming the problem that the internal state of the bogie is difficult to observe, and improving the accuracy of damage monitoring for the composite material bogie.

[0059] Or, in one embodiment of this application, the step of specifying the damage degree of the body is specifying the amplitude difference between the electrical signal and the reference signal; and specifying the damage degree according to the amplitude difference, the preset amplitude, and the corresponding relationship of the damage degree.

[0060] The amplitude difference means the amplitude difference within the difference region between the electrical signal corresponding to the stress wave transmitted to the surface and inside of the important part and the reference signal.

[0061] The method for specifying the corresponding relationship between the preset amplitude and the damage degree may be as follows. That is, stress waves are transmitted to the bodies of composite material bogies with different damage degrees and the body of the undamaged composite material bogie in advance, electrical signals corresponding to the stress waves propagating in the bodies of each composite material bogie are obtained, and the amplitude differences between the electrical signals of the bodies with different damage degrees and the electrical signals of the undamaged body are specified, so as to specify the corresponding relationship between the amplitude and the damage degree according to each amplitude difference and the corresponding damage degree.

[0062] Hereinafter, the health monitoring method in this application will be described in a specific situation.

[0063] Step 1: Obtain in real time the stress when the surface of a preset part on the main body of the composite material trolley is deformed. The preset part includes important parts of the main body and areas where the main body and components are connected by fasteners. Step 2: Identify the proportion between the stress obtained in Step 1 and a preset stress threshold. Step 3: Determine whether the proportion is greater than a preset proportion threshold. Step 4: If the proportion is greater than the preset proportion threshold, send an alarm command to the alarm device so that the alarm device emits alarm information. Step 5: If the proportion is less than or equal to the preset proportion threshold, do not give an early warning. Step 6: Use a driver to transmit a stress wave to the main body, and obtain an electrical signal corresponding to the stress wave transmitted to the surface and inside of important parts of the main body. Step 7: Compare the obtained electrical signal with a reference signal. Step 8: If the similarity between the electrical signal and the reference signal reaches a preset threshold, identify that there is no damage to the main body. Step 9: If the similarity between the electrical signal and the reference signal does not reach the preset threshold, identify that the main body is damaged. Step 10: Identify the amplitude difference between the electrical signal and the reference signal. Step 11: Identify the degree of damage that has occurred to the main body according to the corresponding relationship between the amplitude difference, a preset amplitude, and the degree of damage. Step 12: Identify the damage degree difference between the degree of damage and the maximum allowable degree of damage. Step 13: Obtain the time when damage appears on the main body. Step 14: Identify the undetermined ratio between the remaining life and the time when damage appears according to the ratio of the damage degree difference to the degree of damage. Step 15: Modify the undetermined ratio according to the ratio between the expected stress that the preset part will receive and the stress, and obtain the final ratio between the remaining life and the time. Step 16: Identify the remaining life according to the final ratio and the time when damage appears.

[0064] The following introduces the health monitoring device for a trolley provided by an embodiment of the present invention. The health monitoring device for a trolley described below and the health monitoring method for a trolley described above can be referred to and corresponding to each other. Referring to FIG. 6, FIG. 6 is a structural block diagram of the health monitoring device for a trolley provided by an embodiment of the present application. The device includes a first acquisition module 100 for acquiring the stress when the surface of a preset part on the main body of the composite material trolley is deformed. The preset part includes important parts of the main body and a region where the main body and components are connected by fasteners, and the first acquisition module 100, a first identification module 200 for identifying the degree of damage to the main body, and a prediction module 300 for predicting the remaining life of the composite material trolley according to the stress and the degree of damage.

[0065] The health monitoring device for a trolley in this embodiment is used to implement the aforementioned health monitoring method for a trolley. Therefore, the specific implementation forms in the health monitoring device for a trolley are described in the embodiment part of the health monitoring method for a trolley in the foregoing text. For example, the first acquisition module 100, the first identification module 200, and the prediction module 300 are respectively used to implement steps S101, S102, and S103 in the health monitoring method for the trolley. Therefore, for the specific implementation forms thereof, reference can be made to the descriptions of the corresponding embodiments of each part, and no redundant description will be given here.

[0066] Optionally, the prediction module 300 includes an acquisition unit for acquiring the time when damage appears, a first identification unit for identifying the difference in the degree of damage between the degree of damage and the maximum allowable degree of damage, and a second identification unit for identifying the undetermined ratio between the remaining life and the time according to the ratio of the difference in the degree of damage to the degree of damage. A correction unit that corrects the undetermined ratio according to the ratio between the stress that the preset part is expected to receive and the stress, and obtains the final ratio between the remaining life and the time; And a third specifying unit for specifying the remaining life according to the final ratio and the time.

[0067] Optionally, A second specifying module for specifying the proportionality between the stress and a preset stress threshold; A first determination module for determining whether the proportionality is greater than a preset proportionality threshold; And a first transmission module for transmitting an alarm command to the alarm device so that the alarm device transmits alarm information when the proportionality is greater than the preset proportionality threshold.

[0068] Optionally, A second determination module for determining whether the stress is greater than a preset stress threshold; And a second transmission module for transmitting an alarm command to the alarm device so that the alarm device transmits alarm information when the stress is greater than the preset stress threshold.

[0069] Optionally, A second acquisition module for acquiring an electrical signal corresponding to the stress wave transmitted to the surface and inside of the important part when the driver transmits a stress wave to the main body; A comparison module for comparing the electrical signal with a reference signal, where the reference signal is an electrical signal when there is no damage to the main body; And a third determination module for determining whether the main body is damaged according to the comparison result between the electrical signal and the reference signal.

[0070] Optionally, the first specifying module 200 A third specifying unit for specifying the amplitude difference between the electrical signal and the reference signal; A fourth identifying unit for identifying the degree of damage according to the correspondence relationship between the amplitude difference, the preset amplitude, and the degree of damage.

[0071] Referring to FIG. 7, the present application further provides a bogie health monitoring system, including a controller 2 and a fiber grating sensor 3 connected to the controller 2. The controller 2 is used to implement the bogie health monitoring method described in any of the above embodiments. The fiber grating sensor 3 is provided on the surface of a preset part of the composite material bogie 1, and is used to measure the stress when the preset part is deformed. The preset part includes important parts of the body and regions where the body and components are connected by fasteners.

[0072] Based on the above embodiments, in one embodiment of the present application, the bogie health monitoring system A driver 5 for transmitting a stress wave to an important part of the body. A piezoelectric sensor 4 connected to the controller 2 for sensing the stress wave transmitted to the surface and inside of the important part and converting the sensed stress wave into an electrical signal.

[0073] The piezoelectric sensor 4 is provided on the surface of an important part of the body and embedded inside the important part. For example, when embedded inside, the piezoelectric sensor 4 may be provided between carbon fiber layers or inside carbon fibers of an important part of the body of the carbon fiber reinforced composite material bogie 1.

[0074] In this embodiment, by installing the surface type and embedded type of the piezoelectric sensor 4, the problem that it is difficult to observe the state of the composite material member of the bogie is overcome, and further monitoring of damage is achieved. The embedded type design can install the piezoelectric sensor at a predetermined position inside the structure of the composite material bogie, between fibers or between fiber layers before the body is formed, and achieve the goal of accurately positioning the test sensor without damaging the structure.

[0075] Based on the above embodiments, in one embodiment of the present application, the health monitoring system of the trolley is further includes an ultrasonic guided wave controller 6 connected to the driver for controlling the frequency and energy of transmitting the stress wave of the driver 4.

[0076] Adopt the method of active monitoring. An electrical signal is applied to the driver 4 by the ultrasonic guided wave controller 6 to control the frequency and energy of transmitting the stress wave of the driver 4, and the driver 4 generates a stress wave.

[0077] Based on the above embodiments, in one embodiment of the present application, the health monitoring system of the trolley is further includes a high-speed demodulator 7 connected to the driver for converting the stress wave transmitted from the driver 4 into an electrical signal pattern that can be displayed so that the monitor can observe the transmitted stress wave.

[0078] Each embodiment in this specification is described in a progressive manner. What each embodiment focuses on explaining is the differences from other embodiments. The same or similar parts between each embodiment may be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, it is described relatively simply, and for related elements, reference may be made to the description in the method part.

[0079] The above has introduced in detail the health monitoring method, device and system of the trolley provided by the present application. In this specification, the principle and implementation form of the present application are explained by specific examples. The description of the above embodiments only contributes to the understanding of the method and its core idea of the present application. It should be pointed out that for those skilled in the art, without departing from the principle of the present application, some improvements and modifications can be made to the present application, and all these improvements and modifications fall within the protection scope of the claims of the present application.

Claims

1. A method for health monitoring of a bogie, comprising: obtaining stress when the surface of a preset part on the body of a composite material bogie is deformed, wherein the preset part includes an important part of the body and an area where the body and components are connected by fasteners; identifying the degree of damage to the body; predicting the remaining life of the composite material bogie according to the stress and the degree of damage; A method for health monitoring of a bogie, characterized in that it comprises the above steps.

2. The step of predicting the remaining life of the composite material bogie according to the stress and the degree of damage includes: obtaining the time when damage appears; identifying the difference in the degree of damage between the degree of damage and the maximum allowable degree of damage; identifying an undetermined ratio between the remaining life and the time according to the ratio of the difference in the degree of damage to the degree of damage; correcting the undetermined ratio according to the ratio of the stress expected to be received by the preset part to the stress, and obtaining the final ratio between the remaining life and the time; identifying the remaining life according to the final ratio and the time; A method for health monitoring of a bogie according to Claim 1, characterized in that it comprises the above steps.

3. identifying the proportion of the stress to a preset stress threshold; judging whether the proportion is greater than a preset proportion threshold; when the proportion is greater than the preset proportion threshold, sending an alarm command to the alarm device so that the alarm device sends alarm information; A method for health monitoring of a bogie according to Claim 1, further comprising the above steps.

4. judging whether the stress is greater than a preset stress threshold; when the stress is greater than the preset stress threshold, sending an alarm command to the alarm device so that the alarm device sends alarm information; A method for health monitoring of a bogie according to Claim 1, further comprising the above steps.

5. when the driver transmits a stress wave to the body, obtaining an electrical signal corresponding to the stress wave transmitted to the surface and inside of the important part; comparing the electrical signal with a reference signal, wherein the reference signal is an electrical signal when there is no damage to the body; A step of determining whether the main body is damaged according to a comparison result between the electrical signal and the reference signal, is further included. The method for monitoring the health of a trolley according to any one of claims 1 to 4, characterized in that.

6. The step of specifying the degree of damage of the main body is A step of specifying an amplitude difference between the electrical signal and the reference signal, and A step of specifying the degree of damage according to a correspondence relationship between the amplitude difference, a preset amplitude, and the degree of damage, is included. The method for monitoring the health of a trolley according to claim 5, characterized in that.

7. A health monitoring device for a trolley, comprising A first acquisition module for acquiring stress when the surface of a preset part on the main body of a composite material trolley is deformed, wherein the preset part includes an important part of the main body and a region where the main body and components are connected by fasteners, a first acquisition module A first specification module for specifying the degree of damage of the main body, and A prediction module for predicting the remaining life of the composite material trolley according to the stress and the degree of damage, is included. The health monitoring device for a trolley, characterized in that.

8. A health monitoring system for a trolley, comprising a controller and a fiber grating sensor connected to the controller, The controller is used to implement the method for monitoring the health of a trolley according to any one of claims 1 to 6, The fiber grating sensor is provided on the surface of a preset part on the main body of a composite material trolley and is used to measure stress when the preset part is deformed, and the preset part includes an important part of the main body and a region where the main body and components are connected by fasteners. The health monitoring system for a trolley, characterized in that.

9. A driver for transmitting a stress wave to the important part of the main body, and A piezoelectric sensor connected to the controller for sensing the stress wave transmitted to the surface and inside of the important part and converting the sensed stress wave into an electrical signal, are further included. The health monitoring system for a trolley according to claim 8, characterized in that.

10. An ultrasonic guided wave controller connected to the driver for controlling the frequency and energy of the stress wave transmitted by the driver, is further included. The health monitoring system for a carriage according to claim 9, characterized in that...

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