Strain hardening monitoring method and system for vehicle-mounted gas cylinders

Abstract

The present application discloses a strain hardening monitoring method and system for a vehicle-mounted gas cylinder, and relates to the field of image processing technology. The present application obtains an image of the vehicle-mounted gas cylinder during the strain hardening process to obtain multiple first images, and based on the multiple first images, determines the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information, and obtains a second image of a circumference measurement device, and based on the second image determines the circumferential circumference of the vehicle-mounted gas cylinder body to obtain multiple circumference information, and based on the multiple circumference information, determines the circumference change of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information, and based on the first information and the second information, determines whether the vehicle-mounted gas cylinder has an abnormality during the strain hardening process. The technical solution provided by the present application can improve the accuracy and timeliness of the monitoring results during the strain hardening process.

Description

Technical Field

[0001] The present application relates to the field of image processing technology, and in particular to a strain enhancement monitoring method and system for vehicle-mounted gas cylinders. Background Art

[0002] The strengthening medium of vehicle-mounted gas cylinders (also known as large-volume gas cylinders for automobiles) during the strain hardening process is dry air or nitrogen; due to the high activity of the gas, the strain hardening process reacts more strongly, which poses a great challenge to the control accuracy, processing speed and emergency control system of the monitoring control system. In related technologies, the monitoring of the strain hardening process of vehicle-mounted gas cylinders mostly relies on monitoring the pressure changes in the gas cylinders, supplemented by manual observation of the deformation of the bottle body, and the detection accuracy and timeliness are low. Summary of the invention

[0003] To solve the related technical problems, the embodiments of the present application provide a strain hardening monitoring method and system for vehicle-mounted gas cylinders, which can improve the accuracy and timeliness of monitoring results during the strain hardening process.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The present application embodiment provides a strain hardening monitoring method for a vehicle-mounted gas cylinder, the method comprising:

[0006] During the strain hardening process of the vehicle-mounted gas cylinder, acquiring an image of the vehicle-mounted gas cylinder to obtain a plurality of first images;

[0007] Based on the multiple first images, determining the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information;

[0008] During the strain hardening process of the vehicle-mounted gas cylinder, a second image of the circumference measuring device is acquired, and the circumferential circumference of the body of the vehicle-mounted gas cylinder is determined based on the second image to obtain a plurality of circumference information;

[0009] Based on the multiple perimeter information, determining the perimeter change of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information;

[0010] Based on the first information and the second information, it is determined whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process, and an alarm is issued if the determination result indicates that an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process.

[0011] In the above scheme, determining the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process based on the multiple first images to obtain the first information includes:

[0012] Perform feature matching on each first image and a reference image to obtain a matching result; the reference image is an image of the vehicle-mounted gas cylinder before strain hardening;

[0013] Based on the matching result, first information is obtained.

[0014] In the above scheme, the method further includes:

[0015] Marking a plurality of load points on the body of the vehicle-mounted gas cylinder;

[0016] The step of performing feature matching on each first image and the reference image to obtain a matching result includes:

[0017] For each first image, the vehicle-mounted gas cylinder in the first image is sequentially divided into a first end region, a cylinder region and a second end region in a radial direction; wherein the multiple load points are located in the cylinder region;

[0018] The load points in the first image are feature matched with the load points in the reference image to determine the displacement of the load points and generate a matching result.

[0019] In the above solution, obtaining the first information based on the matching result includes:

[0020] Based on the matching result of each first image and the stress information at the corresponding moment, a first correlation relationship between stress and circumferential strain is determined to obtain first information.

[0021] In the above scheme, the determination of the change in the circumference of the vehicle-mounted gas cylinder during the strain hardening process based on the multiple circumference information to obtain the second information includes:

[0022] Based on each circumference information and the stress information at the corresponding moment, a second correlation relationship between the stress and the circumferential stress is determined to obtain second information.

[0023] In the above solution, judging whether an abnormality occurs to the vehicle-mounted gas cylinder during the strain hardening process based on the first information and the second information includes:

[0024] Verifying the second information using the first information to obtain a verification result;

[0025] Based on the verification result and the stress information at each moment, establishing a first curve representing the relationship between the circumferential stress and the circumferential strain;

[0026] Based on the curve parameters of the first curve at the current moment, it is determined whether the first curve has abnormal fluctuations, and when the first curve has abnormal fluctuations, it is determined that an abnormality has occurred in the strain hardening process of the vehicle-mounted gas cylinder.

[0027] In the above solution, the determining whether the first curve has abnormal fluctuations based on the curve parameters of the first curve at the current moment includes:

[0028] Using a filtering algorithm to smooth the first curve at the current moment, to obtain a corresponding second curve;

[0029] Performing a difference analysis on the first curve and the corresponding second curve to determine a difference value at a current moment;

[0030] It is determined whether the difference value at the current moment is greater than a preset difference threshold, and if the difference value at the current moment is greater than the preset difference threshold, it is determined that the first curve has abnormal fluctuations.

[0031] In the above scheme, the method further includes:

[0032] selecting at least one third image from the plurality of first images;

[0033] Performing feature extraction on the third image to obtain two-dimensional feature information;

[0034] Based on the two-dimensional feature information, it is determined whether there are defects on the surface of the vehicle-mounted gas cylinder, and an alarm is issued if there are defects.

[0035] The present application also provides a strain hardening monitoring system for a vehicle-mounted gas cylinder, the system comprising:

[0036] a measuring unit, configured to obtain an image of the vehicle-mounted gas cylinder during the strain hardening process of the vehicle-mounted gas cylinder to obtain a plurality of first images; and, during the strain hardening process of the vehicle-mounted gas cylinder, obtain a second image of a circumference measuring device, and determine the circumferential circumference of the vehicle-mounted gas cylinder body based on the second image to obtain a plurality of circumference information;

[0037] A processing unit, configured to determine, based on the plurality of first images, a distribution of circumferential strain of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information; and, based on the plurality of circumference information, determine a change in circumference of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information;

[0038] The control unit is used to determine whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process based on the first information and the second information, and to issue an alarm if the judgment result indicates that an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process.

[0039] In the above scheme, the circumference measuring device comprises:

[0040] A flexible ruler is used to measure the annular circumference of the vehicle-borne gas cylinder; the flexible ruler is sleeved on the outer periphery of the body of the vehicle-borne gas cylinder.

[0041] The strain hardening monitoring method and system for vehicle-mounted gas cylinders provided in the embodiments of the present application can acquire the circumference change information of the vehicle-mounted gas cylinder in real time by collecting images, so as to monitor the deformation of the vehicle-mounted gas cylinder body in real time. Compared with the manual monitoring of the outer circumference, the deformation data can be acquired in real time and accurately, thereby improving the accuracy and timeliness of the monitoring results; further, since the circumferential strain distribution and the circumference change are introduced at the same time, the deformation of the bottle body can be monitored more comprehensively and accurately, thereby improving the accuracy of the monitoring results and ensuring the safe implementation of the strain hardening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flow chart of a strain hardening monitoring method for a vehicle-mounted gas cylinder according to an embodiment of the present application;

[0043] Figure 2a This is a schematic diagram of the structure of a flexible scale in a strain enhancement monitoring method for a vehicle-mounted gas cylinder according to an embodiment of the present application;

[0044] Figure 2b for Figure 2a A schematic diagram of the side structure of

[0045] Figure 3 This is a schematic diagram of the structure of a strain hardening monitoring system for a vehicle-mounted gas cylinder according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] The embodiment of the present application provides a strain hardening monitoring method for a vehicle-mounted gas cylinder, which is applied to a strain hardening monitoring system for a vehicle-mounted gas cylinder, and can be specifically applied to electronic devices equipped with the strain hardening monitoring system for a vehicle-mounted gas cylinder, such as industrial computers, servers, etc.; Figure 1 As shown, the method includes:

[0048] Step 101: During the strain hardening process of the vehicle-mounted gas cylinder, an image of the vehicle-mounted gas cylinder is acquired to obtain a plurality of first images.

[0049] In actual application, obtaining the image of the vehicle-mounted gas cylinder can be understood as obtaining the image of the body of the vehicle-mounted gas cylinder, which can be achieved by setting an industrial camera near the vehicle-mounted gas cylinder.

[0050] In actual application, the first image can be continuously acquired along the strain hardening time axis, that is, during the strain process, a first image is acquired at a certain interval to obtain multiple first images; wherein, the time intervals for acquiring the first images can be the same or different, and can be specifically set according to actual application requirements. For example, the first image can be acquired periodically, and this is not limited in the embodiments of the present application.

[0051] Step 102: Based on the multiple first images, determine the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information.

[0052] In actual application, since the strain hardening process will cause deformation of the bottle body, after acquiring the first images at different times at intervals, the deformation of the bottle body can be reflected by comparing the first image with the original image, thereby intuitively and accurately reflecting the state of the vehicle-mounted gas cylinder during the strain hardening process.

[0053] Based on this, in one embodiment, determining the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process based on the multiple first images to obtain the first information may include:

[0054] Perform feature matching on each first image and a reference image to obtain a matching result; the reference image is an image of the vehicle-mounted gas cylinder before strain hardening;

[0055] Based on the matching result, first information is obtained.

[0056] In actual application, the reference image can be understood as the image of the vehicle-mounted gas cylinder in its original form without strain hardening; the reference image can also be called the original image, and the embodiment of the present application does not limit this, as long as the effect can be achieved.

[0057] In actual application, the matching result may include an offset value of the position of the same key point in the first image and the reference image.

[0058] In one embodiment, the method may further include:

[0059] A plurality of load points are marked on the body of the vehicle-mounted gas cylinder.

[0060] In actual application, the load point can be understood as a point marking the area that will produce deformation during the strain hardening process, which is used to reflect the offset direction and offset value of this position during the deformation of the bottle body; the load point can be set by artificial marking or by selecting the position of a marker on the bottle body; the load point can also be called a key point or a marking point, which is not limited in the embodiments of the present application.

[0061] In actual application, due to the different structural parameters of different areas of the bottle body, the deformation curves are also different; for example, for a cylindrical structure with curved surfaces at both ends, the deformation during strain hardening is mainly concentrated in the middle of the cylindrical structure, while the deformation in the end area is relatively small; therefore, in order to improve the accuracy of deformation monitoring data, the image of the vehicle-mounted gas cylinder can be segmented according to the characteristics of the bottle body, and the area that can accurately reflect the deformation characteristics can be selected from the segmented area for data analysis to achieve precise monitoring.

[0062] Based on this, in one embodiment, performing feature matching on each first image and the reference image to obtain a matching result may include:

[0063] For each first image, the vehicle-mounted gas cylinder in the first image is sequentially divided into a first end region, a cylinder region and a second end region in a radial direction; wherein the multiple load points are located in the cylinder region;

[0064] The load points in the first image are feature matched with the load points in the reference image to determine the displacement of the load points and generate a matching result.

[0065] In actual application, when performing image segmentation on the first image, the area with similar deformation characteristics can be determined according to the structural parameters of the bottle body, such as wall thickness, inner diameter, etc. For example, for the ends of the bottle body, the parts with different outer diameters of the bottle body are taken as one area, namely the first end area and the second end area, and the cylindrical area in the middle of the bottle body, that is, the area corresponding to a section of the bottle body with the same outer diameter is taken as the analysis area, that is, the cylindrical area.

[0066] In actual application, when setting the load points, it is necessary to take into account the parameter area used for subsequent data analysis, so as to set the load points in the reference area, so as to determine the deformation characteristics of the area through comparative analysis of the characteristics of the load points; for example, when the cylinder area is used as the reference area for data, all the load points can be set in the cylinder area; in actual application, load points can also be set in the first end area and the second end area to monitor the deformation of the end area, for example, 16 load points are set in the cylinder area according to a 4x4 matrix, and 4 load points are set in the first end area and the second end area according to a 2x2 matrix respectively.

[0067] In actual application, the matching results may include the offset values ​​of the positions of the same key point in the first image and the reference image; for multiple load points located in different parts, the stress distribution can be judged according to the matching results of each load point, for example, whether the distribution is uniform; specifically, the offset values ​​of all load points can be averaged, and then it is calculated whether the difference between each load point and the average is greater than a preset threshold, and if it is greater than the threshold, it is judged that the current load point has strain abnormality, and then subsequent processing processes such as alarm or emergency shutdown, maintenance, etc. are executed.

[0068] In practical applications, for the first images acquired at different times, the relationship between the offset value and the stress at the corresponding time can be established according to the matching results, thereby reflecting the distribution of the circumferential strain.

[0069] Based on this, in one embodiment, obtaining the first information based on the matching result includes:

[0070] Based on the matching result of each first image and the stress information at the corresponding moment, a first correlation relationship between stress and circumferential strain is determined to obtain first information.

[0071] In actual application, since the axial stress can be ignored during the strain hardening process, the stress information in the embodiment of the present application may include information on circumferential stress, that is, information on hoop stress; when obtaining stress information, the circumferential stress can be calculated by the internal pressure of the vehicle-mounted gas cylinder at the corresponding moment; specifically, the data of the pressure sensor used to monitor the internal pressure data of the vehicle-mounted gas cylinder is obtained in real time, and the pressure sensor is installed on the pipeline of the gas cylinder body to ensure that the read pressure value is the internal pressure of the gas cylinder body; the current circumferential stress is calculated using the pressure sensor data at the current moment and the hoop stress formula.

[0072] Exemplarily, the hoop stress formula is expressed as:

[0073]

[0074] pk=11.5P(2)

[0075] Among them, σ represents hoop stress, that is, circumferential stress, pk represents strengthening pressure, D represents the inner diameter of the vehicle gas cylinder, s represents the wall thickness of the vehicle gas cylinder, p represents the internal pressure of the vehicle gas cylinder, and 1.5 is the safety factor.

[0076] In practical applications, after obtaining the matching result of each first image, the offset values ​​of key points at different times can be obtained. According to the circumferential offset value in the offset value at each time, the corresponding relationship between the circumferential stress and the circumferential strain is established to obtain the first information.

[0077] Step 103: During the strain hardening process of the vehicle-mounted gas cylinder, a second image of the circumference measurement device is obtained, and the circumferential circumference of the body of the vehicle-mounted gas cylinder is determined based on the second image to obtain a plurality of circumference information.

[0078] In actual application, the circumference measurement device can display the circumferential circumference measurement value, and by extracting features from the second image, the measurement value can be obtained, thereby obtaining the circumference information.

[0079] In practical application, the circumference measuring device may include a flexible ruler, which is arranged around the outer circumference of the vehicle-mounted gas cylinder. Figure 2a and Figure 2b The schematic diagram of the structure of the circumference flexible ruler is shown in FIG. Figure 2a and Figure 2b As shown, the vehicle-mounted gas cylinder is arranged on the base, the first end of the flexible ruler 2 is located on the first side of the vehicle-mounted gas cylinder and is fixedly connected to the base, and the second end of the flexible ruler 2 is located on the second side of the vehicle-mounted gas cylinder and is in a naturally contracted state, that is, it can be relaxed or tightened with the circumferential deformation of the body of the vehicle-mounted gas cylinder; an arrow 3 is provided on the outer surface of the first side of the vehicle-mounted gas cylinder to indicate the scale on the flexible ruler 2, and the position of the arrow 3 is the target area of ​​the second image, that is, the second image includes the arrow 3 and the image of the area where the scale of the flexible ruler 2 pointed to by the arrow 3 is located; in acquiring the second image, the target object in the second image (that is, the arrow 3 and the flexible ruler 2) is feature extracted to obtain the two-dimensional feature information of the target object, and the measurement value is obtained based on the two-dimensional feature information of the target object, thereby obtaining the circumference information.

[0080] Step 104: Based on the multiple pieces of perimeter information, determine the change in perimeter of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information.

[0081] In practical applications, the change in circumference can be reflected through the correlation between circumference and stress.

[0082] Based on this, in one embodiment, determining the circumference change of the vehicle-mounted gas cylinder during the strain hardening process based on the multiple circumference information to obtain the second information includes:

[0083] Based on each circumference information and the stress information at the corresponding moment, a second correlation relationship between the stress and the circumferential stress is determined to obtain second information.

[0084] In practical applications, the second information, that is, the actual measured circumference information, can also reflect the correlation between stress changes and bottle deformation.

[0085] Step 105: Based on the first information and the second information, determine whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process, and issue an alarm if the determination result indicates that an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process.

[0086] In actual application, both the first information and the second information can reflect the correlation between stress change and strain, but the first information reflects the trend of stress change, while the second information is the actual measured circumference of the bottle, which can intuitively reflect the stress value. Therefore, by introducing the first information and the second information at the same time in the judgment process, the changes in stress and strain can be analyzed from multiple dimensions, thereby more comprehensively constructing the correlation between stress and strain, thereby improving the accuracy of the monitoring results.

[0087] In actual application, the first information can be used as monitoring data, the second information can be used as reference data, and the second information can be used to verify the first information, thereby improving the accuracy of the circumference monitoring result.

[0088] Based on this, in one embodiment, judging whether an abnormality occurs to the vehicle-mounted gas cylinder during the strain hardening process based on the first information and the second information may include:

[0089] Verifying the second information using the first information to obtain a verification result;

[0090] Based on the verification result and the stress information at each moment, establishing a first curve representing the relationship between the circumferential stress and the circumferential strain;

[0091] Based on the curve parameters of the first curve at the current moment, it is determined whether the first curve has abnormal fluctuations, and when the first curve has abnormal fluctuations, it is determined that an abnormality has occurred in the strain hardening process of the vehicle-mounted gas cylinder.

[0092] In actual application, the second information is verified using the first information. When the verification result is obtained, the circumference change value of the bottle body can be calculated according to the first information at each moment to obtain the first value, and the circumference change value of the review can be calculated according to the second information to obtain the second value; the difference between the first value and the second value is calculated, and when the difference is less than a preset threshold, the verification passes. At this time, the average of the first value and the second value can be used as the target value to establish the first curve; when the difference between the first value and the second value is greater than or equal to the preset threshold, the verification fails. At this time, it can be determined that the monitoring system has a fault and needs to be repaired and re-tested in time.

[0093] Here, by adopting a method of mutual verification between the first information and the second information, self-verification of multiple data sources is achieved, thereby ensuring the reliability of the acquired data, thereby ensuring the reliability of the generated first curve, and improving the accuracy of the monitoring results.

[0094] In practical applications, when establishing the first curve representing the relationship between the circumferential stress and the circumferential strain based on the verification results and stress information, it can be understood that the target value calculated after the verification is passed is associated with the circumferential stress at the corresponding moment, and the correlation between the circumferential stress and the circumferential strain at each moment is obtained to establish the first curve.

[0095] In actual application, during the process of strain hardening, the stress should gradually increase with the increase of strain, but if abnormal stress fluctuations occur, such as a sudden drop or a sharp rise, it may indicate that changes have occurred inside the material that are not conducive to deformation, such as crack propagation, phase change or tissue damage; therefore, by detecting the fluctuation of the first curve, it is possible to quickly and intuitively determine whether an abnormality has occurred in the bottle body during the strain hardening process.

[0096] In one embodiment, the determining whether the first curve has abnormal fluctuations based on the curve parameters of the first curve at the current moment may include:

[0097] Using a filtering algorithm to smooth the first curve at the current moment, to obtain a corresponding second curve;

[0098] Performing a difference analysis on the first curve and the corresponding second curve to determine a difference value at a current moment;

[0099] It is determined whether the difference value at the current moment is greater than a preset difference threshold, and if the difference value at the current moment is greater than the preset difference threshold, it is determined that the first curve has abnormal fluctuations.

[0100] In practical applications, the difference analysis of the first curve and the second curve can be performed by calculating the difference in stress values ​​in the first curve and the second curve at the same time; since the curve changes with the time axis, by calculating the difference in stress values ​​in the first curve and the second curve at the current moment, it can be reflected whether the stress change at the current moment fluctuates greatly.

[0101] In actual application, in order to further ensure the comprehensiveness and accuracy of the monitoring system, while realizing the abnormal judgment of the bottle body, the acquired images can also be used to detect the surface defects of the bottle body.

[0102] Based on this, in one embodiment, the method may further include:

[0103] selecting at least one third image from the plurality of first images;

[0104] Performing feature extraction on the third image to obtain two-dimensional feature information;

[0105] Based on the two-dimensional feature information, it is determined whether there are defects on the surface of the vehicle-mounted gas cylinder, and an alarm is issued if there are defects.

[0106] In actual application, the frequency of surface defect detection can be lower than the frequency of first image acquisition; at least one third image is selected from the multiple first images, and the first image of the A·nth frame is extracted along the strain hardening treatment time axis as the third image, A is the extraction interval coefficient, which can be set according to actual monitoring needs, and n is an integer greater than or equal to 1; for example, the frequency of extracting the third image is one third of the frequency of first image acquisition, that is, the 3nth frame of the first image is extracted along the time axis as the third image for surface defect detection, and n is an integer greater than or equal to 1.

[0107] In actual application, at least one third image is selected from multiple first images, and it can also be used to determine whether the current stress reaches a preset stress critical value, and to perform surface defect detection on the first image acquired after reaching the critical value, that is, the first image acquired after the bottle body stress reaches the stress critical value is the third image.

[0108] Here, the stress critical value can be understood as that when the stress exceeds this value, there is a high probability that cracks or other abnormal conditions will occur on the bottle body; the stress critical value can be set based on parameters such as the material and thickness of the vehicle-mounted bottle body and according to historical experimental data, and the embodiments of the present application are not limited to this.

[0109] In practical applications, while establishing the stress-strain curve, the corresponding relationship between the strengthening pressure and time can be established based on the real-time monitored pressure data, and the change rate of the strain-strengthening circumference at different pressure stages can be established based on the obtained circumferential circumference value.

[0110] In actual application, in order to ensure the safety of the gas cylinder during the strain hardening process, when the judgment result indicates that the on-board gas cylinder has an abnormality or a surface defect during the strain hardening process, relevant emergency cut-off control can be performed. Specifically, the strain-hardened gas cylinder can be urgently cut off by controlling the air pressure equipment; of course, when data acquisition is abnormal, for example, the image (first image or second image) cannot be collected, the pressure of the on-board gas cylinder cannot be read, or the pressure data is higher than the preset value, relevant emergency cut-off control can be performed.

[0111] The strain hardening monitoring method for vehicle-mounted gas cylinders provided in the embodiment of the present application acquires the circumference change information of the vehicle-mounted gas cylinder in real time by collecting images, so that the deformation of the vehicle-mounted gas cylinder body can be monitored in real time. Compared with the manual monitoring of the outer circumference, the deformation data can be acquired in real time and accurately, thereby improving the accuracy and timeliness of the monitoring results; further, since the circumferential strain distribution and the circumference change are introduced at the same time, the deformation of the bottle body can be monitored more comprehensively and accurately, thereby improving the accuracy of the monitoring results and ensuring the safe implementation of the strain hardening process.

[0112] In order to implement the strain hardening monitoring method for vehicle-mounted gas cylinders of the present application, the present application embodiment also provides a strain hardening monitoring system for vehicle-mounted gas cylinders, such as Figure 3 As shown, the system may include:

[0113] The measuring unit 301 is used to obtain an image of the vehicle-mounted gas cylinder during the strain hardening process of the vehicle-mounted gas cylinder to obtain a plurality of first images; and, during the strain hardening process of the vehicle-mounted gas cylinder, obtain a second image of the circumference measuring device, and determine the circumferential circumference of the vehicle-mounted gas cylinder body based on the second image to obtain a plurality of circumference information;

[0114] The processing unit 302 is configured to determine, based on the multiple first images, the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information; and, based on the multiple circumference information, determine the circumference change of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information;

[0115] The control unit 303 is used to determine whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process based on the first information and the second information, and to issue an alarm if the judgment result indicates that an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process.

[0116] In one embodiment, the circumference measuring device comprises:

[0117] A flexible ruler is used to measure the annular circumference of the vehicle-borne gas cylinder; the flexible ruler is sleeved on the outer periphery of the body of the vehicle-borne gas cylinder.

[0118] In one embodiment, determining the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process based on the multiple first images to obtain the first information includes:

[0119] Perform feature matching on each first image and a reference image to obtain a matching result; the reference image is an image of the vehicle-mounted gas cylinder before strain hardening;

[0120] Based on the matching result, first information is obtained.

[0121] In one embodiment, the processing unit 302 may also be used to:

[0122] Marking a plurality of load points on the body of the vehicle-mounted gas cylinder;

[0123] The step of performing feature matching on each first image and the reference image to obtain a matching result includes:

[0124] For each first image, the vehicle-mounted gas cylinder in the first image is sequentially divided into a first end region, a cylinder region and a second end region in a radial direction; wherein the multiple load points are located in the cylinder region;

[0125] The load points in the first image are feature matched with the load points in the reference image to determine the displacement of the load points and generate a matching result.

[0126] In one embodiment, obtaining the first information based on the matching result includes:

[0127] Based on the matching result of each first image and the stress information at the corresponding moment, a first correlation relationship between stress and circumferential strain is determined to obtain first information.

[0128] In one embodiment, determining the circumference change of the vehicle-mounted gas cylinder during the strain hardening process based on the multiple circumference information to obtain the second information includes:

[0129] Based on each circumference information and the stress information at the corresponding moment, a second correlation relationship between the stress and the circumferential stress is determined to obtain second information.

[0130] In one embodiment, judging whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process based on the first information and the second information includes:

[0131] Verifying the second information using the first information to obtain a verification result;

[0132] Based on the verification result and the stress information at each moment, establishing a first curve representing the relationship between the circumferential stress and the circumferential strain;

[0133] Based on the curve parameters of the first curve at the current moment, it is determined whether the first curve has abnormal fluctuations, and when the first curve has abnormal fluctuations, it is determined that an abnormality has occurred in the strain hardening process of the vehicle-mounted gas cylinder.

[0134] In one embodiment, determining whether the first curve has abnormal fluctuations based on the curve parameters of the first curve at the current moment includes:

[0135] Using a filtering algorithm to smooth the first curve at the current moment, to obtain a corresponding second curve;

[0136] Performing a difference analysis on the first curve and the corresponding second curve to determine a difference value at a current moment;

[0137] It is determined whether the difference value at the current moment is greater than a preset difference threshold, and if the difference value at the current moment is greater than the preset difference threshold, it is determined that the first curve has abnormal fluctuations.

[0138] In one embodiment, the processing unit 302 may also be used to:

[0139] Selecting at least one third image from the plurality of first images; performing feature extraction on the third image to obtain two-dimensional feature information;

[0140] The control unit 303 may also be used to determine whether there are defects on the surface of the vehicle-mounted gas cylinder based on the two-dimensional feature information, and to generate an alarm if there are defects.

[0141] It should be noted that: the strain hardening monitoring method for vehicle-mounted gas cylinders provided in the above embodiment only uses the division of the above program modules as an example when processing images. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the above-described processing. In addition, the strain hardening monitoring method for vehicle-mounted gas cylinders provided in the above embodiment belongs to the same concept, and its specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0142] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0143] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0144] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A strain hardening monitoring method for vehicle-mounted gas cylinders, characterized in that: The method comprises: During the strain hardening process of the vehicle-mounted gas cylinder, acquiring an image of the vehicle-mounted gas cylinder to obtain a plurality of first images; Based on the multiple first images, determining the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information; During the strain hardening process of the vehicle-mounted gas cylinder, a second image of the circumference measuring device is acquired, and the circumferential circumference of the body of the vehicle-mounted gas cylinder is determined based on the second image to obtain a plurality of circumference information; Based on the multiple perimeter information, determining the perimeter change of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information; Based on the first information and the second information, it is determined whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process, and an alarm is issued if the determination result indicates that an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process; wherein, The determining, based on the first information and the second information, whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process includes: Using the first information to verify the second information, obtaining a verification result; establishing a first curve representing the relationship between circumferential stress and circumferential strain based on the verification result and stress information at each moment; determining whether the first curve has abnormal fluctuations based on curve parameters of the first curve at the current moment, and when the first curve has abnormal fluctuations, determining that an abnormality has occurred in the vehicle-mounted gas cylinder during the strain hardening process; The method of determining whether abnormal fluctuation occurs to the first curve based on the curve parameters of the first curve at the current moment includes: smoothing the first curve at the current moment by using a filtering algorithm to obtain a corresponding second curve; performing a difference analysis on the first curve and the corresponding second curve to determine a difference value at the current moment; judging whether the difference value at the current moment is greater than a preset difference threshold, and determining that abnormal fluctuation occurs to the first curve when the difference value at the current moment is greater than the preset difference threshold.

2. The method according to claim 1, characterized in that The determining, based on the plurality of first images, the circumferential strain distribution of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information includes: Perform feature matching on each first image and a reference image to obtain a matching result; the reference image is an image of the vehicle-mounted gas cylinder before strain hardening; Based on the matching result, first information is obtained.

3. The method according to claim 2, characterized in that The method further comprises: Marking a plurality of load points on the body of the vehicle-mounted gas cylinder; The step of performing feature matching on each first image and the reference image to obtain a matching result includes: For each first image, the vehicle-mounted gas cylinder in the first image is sequentially divided into a first end region, a cylinder region and a second end region in a radial direction; wherein the multiple load points are located in the cylinder region; Perform feature matching on the load points in the first image and the load points in the reference image, determine the displacement of the load points, and generate a matching result.

4. The method according to claim 3, characterized in that The obtaining first information based on the matching result includes: Based on the matching result of each first image and the stress information at the corresponding moment, a first correlation relationship between stress and circumferential strain is determined to obtain first information.

5. The method according to claim 1, characterized in that The determining, based on the plurality of perimeter information, the perimeter change of the vehicle-mounted gas cylinder during the strain hardening process to obtain the second information includes: Based on each circumference information and the stress information at the corresponding moment, a second correlation relationship between stress and circumferential strain is determined to obtain second information.

6. The method according to claim 1, characterized in that The method further comprises: selecting at least one third image from the plurality of first images; Performing feature extraction on the third image to obtain two-dimensional feature information; Based on the two-dimensional feature information, it is determined whether there are defects on the surface of the vehicle-mounted gas cylinder, and an alarm is issued if there are defects.

7. A strain hardening monitoring system for vehicle-mounted gas cylinders, characterized in that: The system comprises: a measuring unit, configured to obtain an image of the vehicle-mounted gas cylinder during the strain hardening process of the vehicle-mounted gas cylinder to obtain a plurality of first images; and, during the strain hardening process of the vehicle-mounted gas cylinder, obtain a second image of a circumference measuring device, and determine the circumferential circumference of the vehicle-mounted gas cylinder body based on the second image to obtain a plurality of circumference information; A processing unit, configured to determine, based on the plurality of first images, a distribution of circumferential strain of the vehicle-mounted gas cylinder during the strain hardening process to obtain first information; and, based on the plurality of circumference information, determine a change in circumference of the vehicle-mounted gas cylinder during the strain hardening process to obtain second information; A control unit is used to determine whether an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process based on the first information and the second information, and to issue an alarm if the determination result indicates that an abnormality occurs in the vehicle-mounted gas cylinder during the strain hardening process; wherein, The control unit is specifically used for: Using the first information to verify the second information, obtaining a verification result; establishing a first curve representing the relationship between circumferential stress and circumferential strain based on the verification result and stress information at each moment; determining whether the first curve has abnormal fluctuations based on curve parameters of the first curve at the current moment, and when the first curve has abnormal fluctuations, determining that an abnormality has occurred in the vehicle-mounted gas cylinder during the strain hardening process; The method of determining whether abnormal fluctuation occurs to the first curve based on the curve parameters of the first curve at the current moment includes: smoothing the first curve at the current moment by using a filtering algorithm to obtain a corresponding second curve; performing a difference analysis on the first curve and the corresponding second curve to determine a difference value at the current moment; judging whether the difference value at the current moment is greater than a preset difference threshold, and determining that abnormal fluctuation occurs to the first curve when the difference value at the current moment is greater than the preset difference threshold.

8. The system according to claim 7, characterized in that The circumference measuring device comprises: A flexible ruler is used to measure the annular circumference of the vehicle-borne gas cylinder; the flexible ruler is sleeved on the outer periphery of the body of the vehicle-borne gas cylinder.

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