Truss lifting stress detection method and detection device

Abstract

The application provides a truss lifting stress detection method and device. The method obtains the ultrasonic wave propagation time of each stress concentration position on the truss through an ultrasonic stress detection device arranged at each stress concentration position, calculates the stress of the obtained ultrasonic wave propagation time of the stress concentration position at a specified ultrasonic frequency by using a critical refraction longitudinal wave method, and obtains the stress value of the stress concentration position at the specified ultrasonic frequency, so as to realize the purpose of ultrasonic wave-based stress detection. Compared with the stress detection using a stress sensor in the prior art, the above method is not easily affected by environmental factors, and can effectively improve the accuracy of stress detection in the truss lifting stress process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring of truss structures, and in particular to a truss lifting stress detection method and a detection device. BACKGROUND

[0002] In modern engineering construction and maintenance processes, the safety and stability of trusses, as an important load-bearing structure, are of great importance. In order to ensure the safety, it is necessary to accurately monitor the stress in the truss lifting.

[0003] At present, the traditional truss lifting stress monitoring technology mainly relies on traditional stress sensors to detect the stress in the truss lifting process. However, in the truss lifting operation, the traditional stress sensors may be affected by environmental factors, resulting in inaccurate data, which is difficult to meet the high real-time requirements of modern engineering. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a truss lifting stress detection method and a detection device to improve the accuracy of stress detection in the truss lifting stress process, thereby ensuring the safety of the truss lifting operation.

[0005] The embodiment of the present application provides a truss lifting stress detection method, which comprises: obtaining the ultrasonic wave propagation time of the ultrasonic stress detection device at each specified ultrasonic frequency at each stress concentration position on the truss; using the critical refraction longitudinal wave method to calculate the stress at the specified ultrasonic frequency at the stress concentration position, and obtaining the stress value at the specified ultrasonic frequency at the stress concentration position; for each stress concentration position, based on the stress values at the stress concentration position at each specified ultrasonic frequency, obtaining the average stress value and the stress value standard deviation corresponding to the stress concentration position, and based on the average stress value and the stress value standard deviation, eliminating the abnormal values from the stress values at the stress concentration position at each specified ultrasonic frequency, and taking the average value of the remaining stress values after eliminating the abnormal values as the target stress value of the stress concentration position; sending the target stress values corresponding to each stress concentration position to a display terminal for display on the display terminal.

[0006] In one embodiment, the stress value of the stress concentration position at the specified ultrasonic frequency is obtained by calculating the stress based on the ultrasonic propagation time of the stress concentration position at the specified ultrasonic frequency and the acoustic elastic coefficient at the specified ultrasonic frequency, including: obtaining the ultrasonic propagation time of the truss at the specified ultrasonic frequency under zero pressure state; obtaining the acoustic elastic coefficient of the truss at the specified ultrasonic frequency; determining the stress value of the stress concentration position at the specified ultrasonic frequency based on the difference between the ultrasonic propagation time of the stress concentration position at the specified ultrasonic frequency and the ultrasonic propagation time of the truss at the specified ultrasonic frequency under zero pressure state, and the acoustic elastic coefficient at the specified ultrasonic frequency.

[0007] In one embodiment, the ultrasonic propagation time of the truss at the specified ultrasonic frequency under zero pressure state is determined by the following steps: obtaining a truss replica member of the same production specification as the truss member constituting the truss; sending an ultrasonic wave at the specified ultrasonic frequency to the specified test position of the truss replica member by the same model of ultrasonic stress detection equipment as any deployed ultrasonic stress detection equipment when the truss replica member is under zero pressure state to obtain the ultrasonic propagation time of the current time; determining the ultrasonic propagation time of the truss under zero pressure state based on the average value of the specified number of ultrasonic propagation times.

[0008] In one embodiment, the acoustic elastic coefficient at the specified ultrasonic frequency is determined by the following steps: applying different axial stresses to the truss replica member, and sending an ultrasonic wave at the specified ultrasonic frequency to the specified test position of the truss replica member by the same model of ultrasonic stress detection equipment as any deployed ultrasonic stress detection equipment when the truss replica member is under each applied axial stress to obtain the ultrasonic propagation time at the specified ultrasonic frequency under the axial stress; obtaining the acoustic elastic coefficient of the truss replica member at the specified ultrasonic frequency based on the obtained ultrasonic propagation times at the specified ultrasonic frequency under various axial stresses; determining the acoustic elastic coefficient of the truss replica member as the acoustic elastic coefficient of the truss at the specified ultrasonic frequency.

[0009] In one embodiment, each stress concentration position on the truss is determined by the following steps: establishing a truss model of the truss; determining multiple stress concentration positions of the truss during the lifting process based on simulation analysis of the lifting process of the truss model.

[0010] In one embodiment, outliers are removed from the stress values of the stress concentration position at various specified ultrasonic frequencies based on the average stress value and the stress value standard deviation, including: for the stress value of the stress concentration position at each specified ultrasonic frequency, if the difference between the stress value and the average stress value is greater than a set threshold value, the stress value is determined to be an outlier; the threshold value is determined based on the stress value standard deviation.

[0011] In one embodiment, the sending of the target stress value corresponding to each stress concentration position to the display terminal for display on the display terminal comprises: for each stress concentration position, sending the target stress value corresponding to the stress concentration position to a designated wireless transmission module for designated data compression and encoding processing by the designated wireless transmission module to obtain a processed target stress value; and transmitting the processed target stress value from the designated wireless transmission module to the display terminal through the designated wireless transmission module.

[0012] The embodiment of the present application also provides a truss lifting stress detection device, which comprises: a first obtaining module configured to obtain, for each stress concentration position on a truss, an ultrasonic wave propagation sound time of an ultrasonic wave emitted by an ultrasonic stress detection device deployed at the stress concentration position and at each designated ultrasonic frequency; a second obtaining module configured to calculate stress at the stress concentration position at the designated ultrasonic frequency by using a critical refraction longitudinal wave method, and obtain a stress value of the stress concentration position at the designated ultrasonic frequency; a third obtaining module configured to, for each stress concentration position, obtain an average stress value and a stress value standard deviation of the stress concentration position based on the stress values of the stress concentration position at each designated ultrasonic frequency, eliminate outliers from the stress values of the stress concentration position at each designated ultrasonic frequency based on the average stress value and the stress value standard deviation, and take an average of the remaining stress values after the elimination of outliers as a target stress value of the stress concentration position; and a sending module configured to send the target stress value corresponding to each stress concentration position to a display terminal for display on the display terminal.

[0013] In one embodiment, the calculation of the stress value of the stress concentration position at the designated ultrasonic frequency by using the critical refraction longitudinal wave method comprises: obtaining an ultrasonic wave propagation sound time of the truss at zero pressure at the designated ultrasonic frequency; obtaining an acoustic elastic coefficient of the truss at the designated ultrasonic frequency; and determining the stress value of the stress concentration position at the designated ultrasonic frequency based on the difference between the ultrasonic wave propagation sound time of the stress concentration position at the designated ultrasonic frequency and the ultrasonic wave propagation sound time of the truss at zero pressure at the designated ultrasonic frequency and the acoustic elastic coefficient. In this way, the stress value of the stress concentration position at the designated ultrasonic frequency can be accurately obtained.

[0014] In one embodiment, the ultrasonic wave propagation time under the zero stress state at any specified ultrasonic frequency is determined by the following steps: obtaining a truss replica member of the same production specification as the truss members constituting the truss; when the truss replica member is in the zero stress state, sending an ultrasonic wave at the specified ultrasonic frequency to the specified test position of the truss replica member by the same model of ultrasonic stress detection equipment as any deployed ultrasonic stress detection equipment to obtain the current time of ultrasonic wave propagation; and determining the ultrasonic wave propagation time under the zero stress state based on the average of the specified number of times of ultrasonic wave propagation time. In this way, the ultrasonic wave propagation time under the zero stress state at any specified ultrasonic frequency can be more accurately obtained.

[0015] In one embodiment, the acoustic-elastic coefficient at any specified ultrasonic frequency is determined by the following steps: applying different axial stresses to the truss replica member, and when the truss replica member is under each applied axial stress, sending an ultrasonic wave at the specified ultrasonic frequency to the specified test position of the truss replica member by the same model of ultrasonic stress detection equipment as any deployed ultrasonic stress detection equipment to obtain the ultrasonic wave propagation time at the specified ultrasonic frequency under the axial stress; obtaining the acoustic-elastic coefficient of the truss replica member at the specified ultrasonic frequency based on the obtained ultrasonic wave propagation times at the specified ultrasonic frequency under various axial stresses; and determining the acoustic-elastic coefficient of the truss replica member as the acoustic-elastic coefficient of the truss at the specified ultrasonic frequency. In this way, the acoustic-elastic coefficient at any specified ultrasonic frequency can be more accurately obtained.

[0016] In one embodiment, each stress concentration position on the truss is determined by the following steps: establishing a truss model of the truss; and determining a plurality of stress concentration positions of the truss during the lifting process based on simulation analysis of the lifting process of the truss model. The simulation analysis determines various stress concentration positions corresponding to the actual situation, providing a solid foundation for subsequent calculations.

[0017] In one embodiment, based on the average stress value and the stress value standard deviation, outliers are removed from the stress values at the stress concentration position at each specified ultrasonic frequency, including: for the stress value at the stress concentration position at each specified ultrasonic frequency, if the difference between the stress value and the average stress value is greater than a set threshold, the stress value is determined to be an outlier; and the set threshold is determined based on the stress value standard deviation. In this way, outliers are removed to use more accurate data for subsequent operations, ensuring the accuracy of subsequent calculations.

[0018] In one embodiment, the target stress value corresponding to each stress concentration position is sent to the display terminal for display on the display terminal, including: for each stress concentration position, sending the target stress value corresponding to the stress concentration position to a designated wireless transmission module for designated data compression and encoding processing to obtain a processed target stress value; and transmitting the processed target stress value from the designated wireless transmission module to the display terminal through the designated wireless transmission module. In this way, the user can view the real-time processing result on the display terminal, so that the operator can grasp the stress condition of the truss at any time, and timely discover and handle the abnormality, thereby ensuring the safety of the lifting operation.

[0019] The embodiment of the present application also provides an electronic device, comprising a processor and a computer readable storage medium for storing computer program instructions, which, when executed by the computer readable storage medium, causes the processor to perform the steps of the above method.

[0020] The embodiment of the present application also provides a machine readable storage medium, which stores computer program instructions, which, when executed, can implement the steps of the above method.

[0021] In the embodiment, the ultrasonic stress detection device deployed on each stress concentration position of the truss is used to obtain the ultrasonic wave propagation time of the stress concentration position at each specified ultrasonic frequency, and the critical refraction longitudinal wave method is used to calculate the stress of the stress concentration position at the specified ultrasonic frequency to obtain the stress value of the stress concentration position at the specified ultrasonic frequency, thereby achieving the purpose of ultrasonic stress detection. Compared with the stress sensor used in the prior art, the above method is less affected by environmental factors and can effectively improve the accuracy of stress detection during the truss lifting stress process.

[0022] Further, in the embodiment of the present application, for each stress concentration position, the average stress value and the stress value standard deviation of the stress concentration position are obtained based on the stress values of the stress concentration position at each specified ultrasonic frequency, and the average stress value and the stress value standard deviation are used to eliminate outliers from the stress values of the stress concentration position at each specified ultrasonic frequency, and the average value of the remaining stress values after eliminating the outliers is taken as the target stress value of the stress concentration position, so that the adverse effects of the outliers are eliminated, and the target stress values of each stress concentration position obtained are more accurate, that is, the accuracy of stress detection during the truss lifting stress process is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 An implementation scenario diagram of the truss lifting stress detection method provided by the embodiment of the present application is shown.

[0024] Figure 2 is a flowchart of a truss lifting stress detection method provided by an embodiment of the present application.

[0025] Figure 3 is a flowchart of obtaining a stress value by a critical refraction longitudinal wave method provided by an embodiment of the present application.

[0026] Figure 4 is a flowchart of removing an abnormal value provided by an embodiment of the present application.

[0027] Figure 5 is a structural diagram of a truss lifting stress detection device provided by an embodiment of the present application.

[0028] Figure 6 is a structural diagram of an electronic device provided by an embodiment of the present application.

[0029] The labels of the components in the drawings are as follows: 1, truss; 2, ultrasonic stress detection device; 3, truss stress concentration position. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present application are described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly defined.

[0031] Referring to Figure 1 , Figure 1 is an implementation scenario diagram of a truss lifting stress detection method provided by an embodiment of the present application. As shown in Figure 1 , the implementation scenario involves a truss 1, a truss lifting stress detection device 2, and one of a plurality of stress concentration positions 3. The truss lifting stress detection device 2 executes the method provided by the following embodiments to obtain the target stress value of each stress concentration position. For details, see the following embodiments, which will not be described here.

[0032] Referring to Figure 2 , Figure 2 is a flowchart of a truss lifting stress detection method provided by an embodiment of the present application. As shown in Figure 2 , the detection method includes the following steps.

[0033] S201, for each stress concentration position on the truss, obtain the ultrasonic wave propagation time of the ultrasonic wave emitted by the ultrasonic stress detection device at each specified ultrasonic frequency at the stress concentration position.

[0034] In the embodiment, each stress concentration position on the truss is obtained based on the truss model construction and simulation analysis of the hoisting process of the truss model construction. The specific implementation of each stress concentration position will be described in the form of specific embodiments hereinafter, which will not be repeated here.

[0035] In the embodiment, the ultrasonic stress detection device includes an ultrasonic generator, a transmitting probe, a receiving probe, etc. The ultrasonic generator generates ultrasonic waves at a specified ultrasonic frequency. The transmitting probe transmits the ultrasonic waves, and the receiving probe receives the ultrasonic waves. The difference between the arrival time of the transmitting wave pulse emitted by the transmitting probe and the arrival time of the receiving wave pulse received by the receiving probe is determined as the ultrasonic propagation time. The ultrasonic propagation time is the propagation time of the ultrasonic waves at the stress concentration position.

[0036] In the embodiment, the specified ultrasonic frequency includes but is not limited to , and frequency . The specified ultrasonic frequency can be set according to the specific application scenario, and the embodiment of the present application does not specifically limit it.

[0037] For ease of description, any stress concentration position is denoted as , any specified ultrasonic frequency is denoted as , and the ultrasonic propagation time of any stress concentration position at any specified ultrasonic frequency is denoted as .

[0038] S202, using the critical refraction longitudinal wave method, the ultrasonic propagation time of the stress concentration position at the specified ultrasonic frequency is obtained. The stress value of the stress concentration position at the specified ultrasonic frequency is obtained.

[0039] In the embodiment, the specific implementation of the above step S202 has many, which will be described in the form of specific embodiments hereinafter, which will not be repeated here.

[0040] S203, for each stress concentration position, based on the stress value of the stress concentration position at each specified ultrasonic frequency, the average stress value and the stress value standard deviation corresponding to the stress concentration position are obtained, and based on the average stress value and the stress value standard deviation, the abnormal value is removed from the stress value of the stress concentration position at each specified ultrasonic frequency, and the average value of the remaining stress values after removing the abnormal value is taken as the target stress value of the stress concentration position.

[0041] In the embodiment, the specific implementation of the above step S203 has many, which will be described in the form of specific embodiments hereinafter, which will not be repeated here.

[0042] ​S204, send the target stress value corresponding to each stress concentration location to the display terminal for display.

[0043] In this embodiment, there are many ways to implement the above step S204, which will be described in detail in the following text with specific embodiments, and will not be repeated here.

[0044] This concludes the process. Figure 2 The process is shown below.

[0045] pass Figure 2 The process achieves the following effect: by using ultrasonic stress detection equipment deployed at each stress concentration location on the truss to obtain the ultrasonic propagation time at each specified ultrasonic frequency at that stress concentration location, the critical refraction longitudinal wave method is used to calculate the stress at that specified ultrasonic frequency and obtain the stress value at that stress concentration location. This achieves the purpose of ultrasonic stress detection. Compared with the existing technology that uses stress sensors to detect stress, the above method is less affected by environmental factors and can effectively improve the accuracy of stress detection during truss lifting stress.

[0046] Furthermore, in this embodiment, for each stress concentration location, based on the stress value at each specified ultrasonic frequency, the average stress value and standard deviation of the stress value corresponding to the stress concentration location are obtained. Based on the average stress value and standard deviation of the stress value, outliers are removed from the stress values ​​at each specified ultrasonic frequency. The average value of the remaining stress values ​​after removing outliers is taken as the target stress value for the stress concentration location. By eliminating the adverse effects of outliers, the target stress values ​​obtained for each stress concentration location are more accurate. In other words, the accuracy of stress detection during truss lifting stress is further improved.

[0047] In one embodiment, each stress concentration location on the truss is determined by the following steps: establishing a truss model; and determining multiple stress concentration locations of the truss during the lifting process based on a simulation analysis of the truss model.

[0048] Specifically, for example, a three-dimensional model of the truss lifting process is established using simulation methods such as finite element analysis. The loads applied during lifting and the stress on the truss structure are simulated, and the stress distribution of each node and component is analyzed in detail. Through simulation analysis, the stress concentration points of the truss during the lifting process are determined. These stress concentration points are the locations of stress concentration (denoted as...). Stress concentration points are locations where stress is greatest or changes most significantly. Based on simulation results, ultrasonic stress detection equipment is installed at these stress concentration points.

[0049] In the embodiment, the monitoring layout of the stress concentration position is optimized through the simulation analysis, thereby providing a basis for obtaining accurate target stress values.

[0050] Referring to Figure 3 , Figure 3 is a flowchart of obtaining a stress value by using the critical refraction longitudinal wave method according to an embodiment of the present application. As shown in Figure 3 , the stress value of the stress concentration position at the specified ultrasonic frequency is obtained by using the critical refraction longitudinal wave method to calculate the stress of the ultrasonic propagation time of the stress concentration position at the specified ultrasonic frequency, and includes the following steps.

[0051] S301, obtaining the ultrasonic propagation time of the truss at the specified ultrasonic frequency under zero pressure.

[0052] S302, obtaining the acoustic elastic coefficient of the truss at the specified ultrasonic frequency.

[0053] The ultrasonic propagation time of the truss at any specified ultrasonic frequency under zero pressure and the acoustic elastic coefficient at the specified ultrasonic frequency are determined after determining the plurality of stress concentration positions of the truss during hoisting in the following manner, and can be stored in a specified storage location in the ultrasonic stress detection device. When the ultrasonic stress detection device obtains the stress value of the stress concentration position at the specified ultrasonic frequency, the stored acoustic elastic coefficient and the ultrasonic propagation time under zero pressure are directly called for operation.

[0054] In one embodiment, the ultrasonic propagation time under zero pressure at any specified ultrasonic frequency is determined by the following steps: obtaining a truss replica member of the same production specification as the truss member constituting the truss. After obtaining the truss replica member, when the truss replica member is in a zero pressure state, an ultrasonic stress detection device of the same model as any deployed ultrasonic stress detection device is used to send an ultrasonic wave at the specified ultrasonic frequency to a specified test position of the truss replica member, calculate the difference between the arrival time of the transmission wave pulse and the arrival time of the reception wave pulse of the transmission probe to obtain the ultrasonic propagation time of the current time. Then, based on the average value of the specified number of ultrasonic propagation times, the ultrasonic propagation time under zero pressure is determined. The following is described in more detail by way of example.

[0055] For example, when the truss replica member is in a zero pressure state, the pulse arrival time of the transmission wave and the reception wave is captured under the condition that the ultrasonic wave generator frequency is , and the ultrasonic propagation time under zero stress is calculated. This is repeated 10 times, and the ultrasonic propagation time under zero stress obtained 10 times is Perform the averaging operation to determine the final operation structure. The propagation time of ultrasound in a zero-pressure state (denoted as ) ).

[0056] In one embodiment, the acoustoelastic coefficient at any specified ultrasonic frequency is determined by the following steps: Different axial stresses are applied to the truss replica member. The specific axial stress can be set according to the specific application scenario, and this embodiment is not specifically limited. Under each applied axial stress, an ultrasonic wave at the specified ultrasonic frequency is transmitted to a specified test location of the truss replica member using an ultrasonic stress detection device of the same model as any deployed ultrasonic stress detection device, to obtain the ultrasonic wave propagation time under the specified axial stress at that specified ultrasonic frequency. This process is repeated to obtain the ultrasonic wave propagation time under each axial stress at the specified ultrasonic frequency. Based on the obtained ultrasonic wave propagation time under each axial stress at the specified ultrasonic frequency, the acoustoelastic coefficient of the truss replica member at that specified ultrasonic frequency is obtained. The acoustoelastic coefficient of the truss replica member is then determined as the acoustoelastic coefficient of the truss at that specified ultrasonic frequency.

[0057] For example, continuing from the previous example, axial stress is applied to the truss replica member. ,exist Transmitting and receiving ultrasonic waves to obtain Lower axial stress The propagation time of the ultrasound in this structure, i.e. Lower axial stress Ultrasonic sound propagation time When the ultrasonic wave propagates... With axial stress This is denoted as a set of data ( Under different pressures, Repeat the above steps 15 times to obtain 15 sets of data. .against The slope is calculated using the least squares method, and the obtained slope is the slope of the truss replica member. elasticity coefficient Also for trusses in elastic modulus .

[0058] It should be noted that, respectively in and By repeating the above steps under the given conditions, the truss can be obtained in... Ultrasonic propagation time under zero pressure and in The acoustic elastic coefficient at the bottom trusses in ultrasonic propagation time of the stress concentration position under the specified ultrasonic frequency , and the ultrasonic propagation time of the zero pressure state under the specified ultrasonic frequency . .

[0059] S303, determining the stress value of the stress concentration position under the specified ultrasonic frequency based on the difference between the ultrasonic propagation time of the stress concentration position under the specified ultrasonic frequency and the ultrasonic propagation time of the zero pressure state under the specified ultrasonic frequency, and the acoustic elastic coefficient.

[0060] For example, ultrasonic propagation time of the stress concentration position under the specified ultrasonic frequency . .

[0061] The stress value of the stress concentration position under the specified ultrasonic frequency is calculated by the following formula:

[0062]

[0063] wherein, the stress value of the stress concentration position under the specified ultrasonic frequency;

[0064] the ultrasonic propagation time of the zero pressure state under the specified ultrasonic frequency;

[0065] the ultrasonic propagation time of the stress concentration position under the specified ultrasonic frequency. Repeating the above steps S301-S303, the stress values of each stress concentration position under the specified ultrasonic frequency ,

[0066] the stress value of each stress concentration position , the stress value of each stress concentration position , the stress value of each stress concentration position , , and the stress value of each stress concentration position .

[0067] In this embodiment, the stress value of each stress concentration position under different specified ultrasonic frequencies can be obtained by the above method. The stress value obtained by the multi-frequency ultrasonic wave can ensure the reliability of the obtained stress value.

[0068] Referring to Figure 4 , Figure 4 is the flowchart provided by the present embodiment for removing outliers. As shown in Figure 4 , removing outliers specifically includes the following steps.

[0069] ​​​S401, for each stress concentration location, based on the stress value at that stress concentration location under each specified ultrasonic frequency, obtain the average stress value and the standard deviation of the stress value corresponding to that stress concentration location.

[0070] For example, at any stress concentration location average stress value and stress value standard deviation Determined by the following formula:

[0071]

[0072] in, for Lower stress concentration location The stress value;

[0073] for Lower stress concentration location The stress value;

[0074] for Lower stress concentration location The stress value.

[0075] S402, for each specified ultrasonic frequency at the stress concentration location, if the difference between the stress value and the average stress value is greater than a set threshold, then the stress value is determined to be an abnormal value; the set threshold is determined based on the standard deviation of the stress value.

[0076] For example, a threshold T is set if an ultrasound frequency is specified. Lower stress concentration location stress value With this stress concentration location average stress value If the difference exceeds the threshold T, then it is considered that... This is an outlier. It can be expressed using the following formula: In a further embodiment, after outliers are removed, the average of the remaining stress values ​​is taken as the target stress value at the stress concentration location.

[0077] For example, the process of obtaining the target stress value at any stress concentration location can be expressed by the following formula:

[0078]

[0079] in, Location of stress concentration The target stress value;

[0080] Location of stress concentration an abnormal value; obtaining a stress value of each stress concentration position from a specified ultrasonic frequency obtaining a stress value of each stress concentration position from a specified ultrasonic frequency obtaining a stress value of each stress concentration position from a specified ultrasonic frequency

[0081] In the embodiment, by the above manner, the abnormal value is removed from the stress value of each stress concentration position from the specified ultrasonic frequency obtaining a stress value of each stress concentration position from a specified ultrasonic frequency

[0082] In one embodiment, for each stress concentration position, the target stress value corresponding to the stress concentration position is sent to a specified wireless transmission module (such as a Zigbee wireless transmission module) to perform specified data compression and encoding processing in the specified wireless transmission module to obtain a processed target stress value. The processed target stress value is transmitted to the display terminal through the configured specified wireless transmission module by the specified wireless transmission module. In this way, the efficiency and integrity of data transmission can be improved. In addition, by using encryption transmission technology, the safety of data in the transmission process is ensured to prevent data from being intercepted or tampered with.

[0083] Correspondingly, the display terminal is equipped with a corresponding Zigbee receiving module and can receive the processed target stress values from multiple stress concentration positions. Decoding and checking the received data can also ensure the integrity and accuracy of the received data.

[0084] In one embodiment, on the display terminal, a graphical user interface (Graphical User Interface, GUI) is used to display the target stress values and historical target stress value trends of each stress concentration position. The terminal system stores and analyzes the received data to generate a stress change statistical report, which facilitates the monitoring and decision-making of the operator.

[0085] In the above embodiment, the wireless transmission module is used to realize the real-time feedback of the target stress values of each stress concentration position, so that the operator can master the stress situation of the truss at any time, discover and handle the abnormality in time, and ensure the safety of the lifting operation.

[0086] The above describes the method provided by the embodiments of the present application, and the following describes the device provided by the embodiments of the present application:

[0087] Referring to Figure 5 , Figure 5 FIG. 1 is a structural diagram of a truss lifting stress detection device provided by the embodiments of the present application. As shown in Figure 5 the device 500 includes a first obtaining module 501, a second obtaining module 502, a third obtaining module 503, and a sending module 504.

[0088] The first obtaining module 501 is configured to, for each stress concentration position on the truss, obtain an ultrasonic wave propagation time of an ultrasonic wave emitted by an ultrasonic stress detection device deployed at the stress concentration position at each specified ultrasonic frequency.

[0089] The second obtaining module 502 is configured to, by using the critical refraction longitudinal wave method, perform stress calculation on the obtained ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency, to obtain a stress value of the stress concentration position at the specified ultrasonic frequency.

[0090] The third obtaining module 503 is configured to, for each stress concentration position, obtain an average stress value and a stress value standard deviation of the stress concentration position based on the stress values of the stress concentration position at each specified ultrasonic frequency, and based on the average stress value and the stress value standard deviation, eliminate outliers from the stress values of the stress concentration position at each specified ultrasonic frequency, and take an average of the remaining stress values after the outliers are eliminated as a target stress value of the stress concentration position.

[0091] The sending module 504 is configured to send the target stress value corresponding to each stress concentration position to a display terminal for display on the display terminal.

[0092] In an embodiment, the stress value of the stress concentration position at the specified ultrasonic frequency is obtained by using the critical refraction longitudinal wave method to perform stress calculation on the obtained ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency, and the obtaining includes:

[0093] Obtaining an ultrasonic wave propagation time of the truss at the specified ultrasonic frequency under a zero pressure state;

[0094] Obtaining an acoustic elastic coefficient of the truss at the specified ultrasonic frequency;

[0095] Determining the stress value of the stress concentration position at the specified ultrasonic frequency based on the difference between the ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency and the ultrasonic wave propagation time of the truss at the specified ultrasonic frequency under the zero pressure state, and the acoustic elastic coefficient. In this way, the stress value of the stress concentration position at the specified ultrasonic frequency can be accurately obtained.

[0096] In one embodiment, the ultrasonic wave propagation time under the zero stress state at any specified ultrasonic frequency is determined by the following steps: obtaining a truss replica member of the same production specification as the truss members constituting the truss; when the truss replica member is in the zero stress state, sending an ultrasonic wave at the specified ultrasonic frequency to the specified test position of the truss replica member by the same model of ultrasonic stress detection device as any deployed ultrasonic stress detection device to obtain the current time of ultrasonic wave propagation; determining the ultrasonic wave propagation time under the zero stress state based on the average of the specified times of ultrasonic wave propagation. In this way, the ultrasonic wave propagation time under the zero stress state at any specified ultrasonic frequency can be more accurately obtained.

[0097] In one embodiment, the acoustic elastic coefficient at any specified ultrasonic frequency is determined by the following steps: applying different axial stresses to the truss replica member, and when the truss replica member is under each applied axial stress, sending an ultrasonic wave at the specified ultrasonic frequency to the specified test position of the truss replica member by the same model of ultrasonic stress detection device as any deployed ultrasonic stress detection device to obtain the ultrasonic wave propagation time at the specified ultrasonic frequency under the axial stress; based on the obtained ultrasonic wave propagation times at the specified ultrasonic frequency under various axial stresses, obtaining the acoustic elastic coefficient of the truss replica member at the specified ultrasonic frequency; determining the acoustic elastic coefficient of the truss replica member as the acoustic elastic coefficient of the truss at the specified ultrasonic frequency. In this way, the acoustic elastic coefficient at any specified ultrasonic frequency can be more accurately obtained.

[0098] In one embodiment, each stress concentration position on the truss is determined by the following steps: establishing a truss model of the truss; based on simulation analysis of the hoisting process of the truss model, determining multiple stress concentration positions of the truss during the hoisting process. In this way, the stress concentration positions determined by simulation analysis correspond to the actual situation, providing a solid foundation for subsequent calculations.

[0099] In one embodiment, based on the average stress value and the stress value standard deviation, outliers are removed from the stress values of the stress concentration position at each specified ultrasonic frequency, including: for the stress value of the stress concentration position at each specified ultrasonic frequency, if the difference between the stress value and the average stress value is greater than a set threshold, the stress value is determined to be an outlier; the threshold is determined based on the stress value standard deviation. In this way, outliers are removed to use more accurate data for subsequent operations, ensuring the accuracy of subsequent calculations.

[0100] In one embodiment, the target stress value corresponding to each stress concentration position is sent to the display terminal for display on the display terminal, including: for each stress concentration position, sending the target stress value corresponding to the stress concentration position to a designated wireless transmission module for designated data compression and encoding processing to obtain a processed target stress value; and transmitting the processed target stress value from the designated wireless transmission module to the display terminal through the designated wireless transmission module. In this way, the user can watch the real-time processing result on the display terminal, so that the operator can grasp the stress condition of the truss at any time, and timely discover and handle the abnormality, thereby ensuring the safety of the lifting operation.

[0101] The device provided by the present application has simple design, is easy to install at the stress concentration position of the lifting truss, has high integration, and is convenient for on-site use and maintenance. Through real-time monitoring and data return function, potential stress overload condition can be warned in advance, so that the truss is prevented from being broken or other dangerous conditions due to excessive stress during lifting, and the safety of the lifting operation is improved. In addition, the device and method are not only suitable for stress monitoring during truss lifting, but also can be popularized and applied to other structures that need to monitor stress changes in real time, such as bridges and building components.

[0102] At this point, the structure of the device is completed. Figure 5 The structure of the device is described.

[0103] Referring to Figure 6 , Figure 6 The electronic device structure diagram provided by the embodiment of the present application is shown. As shown in the figure, the hardware structure can include a processor and a machine readable storage medium, the machine readable storage medium stores machine executable instructions that can be executed by the processor; the processor is used to execute the machine executable instructions to realize the method disclosed in the above examples of the present application. Figure 6

[0104] Based on the same application concept as the above method, the embodiment of the present application also provides a machine readable storage medium, the machine readable storage medium stores a plurality of computer instructions, and the computer instructions are executed by the processor to realize the method disclosed in the above examples of the present application.

[0105] For example, the machine readable storage medium can be: RAM (Radom Access Memory, random access memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), solid state disk, any type of storage disk (such as optical disk, dvd, etc.), or similar storage medium, or combination thereof.

[0106] ​The above merely provides an example of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the scope of claims of the present application.

Claims

1. A truss hoisting stress detection method characterized by, The method comprises: obtaining, for each stress concentration position on the truss, an ultrasonic wave propagation time of an ultrasonic stress detection device deployed at the stress concentration position at each specified ultrasonic frequency; calculating the stress of the obtained ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency by using a critical refraction longitudinal wave method to obtain the stress value of the stress concentration position at the specified ultrasonic frequency; for each stress concentration position, obtaining the average stress value and the stress value standard deviation of the stress concentration position based on the stress values of the stress concentration position at each specified ultrasonic frequency, eliminating outliers from the stress values of the stress concentration position at each specified ultrasonic frequency based on the average stress value and the stress value standard deviation, and taking the average of the remaining stress values after eliminating outliers as the target stress value of the stress concentration position; sending the target stress value of each stress concentration position to a display terminal for display on the display terminal; calculating the stress of the obtained ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency to obtain the stress value of the stress concentration position at the specified ultrasonic frequency, comprising: obtaining the ultrasonic wave propagation time of the truss in a zero-pressure state at the specified ultrasonic frequency; obtaining the acoustic elastic coefficient of the truss at the specified ultrasonic frequency; determining the stress value of the stress concentration position at the specified ultrasonic frequency based on the difference between the ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency and the ultrasonic wave propagation time of the truss in a zero-pressure state at the specified ultrasonic frequency, and the acoustic elastic coefficient; The ultrasonic wave propagation time of the truss in a zero-pressure state at any specified ultrasonic frequency is determined by the following steps: obtaining a truss replica member of the same production specification as the truss member that constitutes the truss; when the truss replica member is in a zero-pressure state, sending ultrasonic waves at the specified ultrasonic frequency to the specified test position of the truss replica member by an ultrasonic stress detection device of the same model as any deployed ultrasonic stress detection device to obtain the ultrasonic wave propagation time of the current time; determining the ultrasonic wave propagation time of the zero-pressure state based on the average of the specified number of ultrasonic wave propagation times; The acoustic elastic coefficient at any specified ultrasonic frequency is determined by the following steps: applying different axial stresses to the truss replica member, and when the truss replica member is under each applied axial stress, sending ultrasonic waves at the specified ultrasonic frequency to the specified test position of the truss replica member by an ultrasonic stress detection device of the same model as any deployed ultrasonic stress detection device to obtain the ultrasonic wave propagation time at the specified ultrasonic frequency under the axial stress; obtaining the acoustic elastic coefficient of the truss replica member at the specified ultrasonic frequency based on the obtained ultrasonic wave propagation times at the specified ultrasonic frequency under each axial stress; determining the acoustic elastic coefficient of the truss replica member as the acoustic elastic coefficient of the truss at the specified ultrasonic frequency.

2. The method of claim 1, wherein, Each stress concentration position on the truss is determined by the following steps: a truss model of the truss is established; a plurality of stress concentration positions of the truss in the lifting process are determined based on simulation analysis of the lifting process on the truss model.

3. The method of claim 1, wherein, The removing of outliers from the stress values of the stress concentration positions at each specified ultrasonic frequency based on the average stress value and the stress value standard deviation comprises: For the stress value of the stress concentration position at each specified ultrasonic frequency, if the difference between the stress value and the average stress value is greater than a set threshold value, the stress value is determined as an outlier; the set threshold value is determined based on the stress value standard deviation.

4. The method of claim 1, wherein, The sending of the target stress value corresponding to each stress concentration position to a display terminal for display on the display terminal comprises: For each stress concentration position, the target stress value corresponding to the stress concentration position is sent to a specified wireless transmission module for specified data compression and encoding processing by the specified wireless transmission module to obtain a processed target stress value; The processed target stress value is transmitted to the display terminal by the specified wireless transmission module through the configured specified wireless transmission module.

5. A truss hoisting stress detection device characterized by comprising: The device comprises: A first obtaining module is configured to, for each stress concentration position on the truss, obtain the ultrasonic wave propagation time of the ultrasonic wave emitted by the ultrasonic stress detection device at each specified ultrasonic frequency at the stress concentration position; A second obtaining module is configured to, by using the critical refraction longitudinal wave method, perform stress calculation on the obtained ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency to obtain the stress value of the stress concentration position at the specified ultrasonic frequency; A third obtaining module is configured to, for each stress concentration position, based on the stress value of the stress concentration position at each specified ultrasonic frequency, obtain the average stress value and the stress value standard deviation corresponding to the stress concentration position, and based on the average stress value and the stress value standard deviation, remove outliers from the stress values of the stress concentration position at each specified ultrasonic frequency, and take the average of the remaining stress values after removing outliers as the target stress value of the stress concentration position; A sending module is configured to send the target stress value corresponding to each stress concentration position to a display terminal for display on the display terminal; The stress calculation on the obtained ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency to obtain the stress value of the stress concentration position at the specified ultrasonic frequency comprises: obtaining the ultrasonic wave propagation time of the truss in the zero pressure state at the specified ultrasonic frequency; obtaining the acoustic elastic coefficient of the truss at the specified ultrasonic frequency; determining the stress value of the stress concentration position at the specified ultrasonic frequency based on the difference between the ultrasonic wave propagation time of the stress concentration position at the specified ultrasonic frequency and the ultrasonic wave propagation time of the truss in the zero pressure state at the specified ultrasonic frequency, and the acoustic elastic coefficient; The ultrasonic wave propagation time of the truss in the zero pressure state at any specified ultrasonic frequency is determined by the following steps: obtaining a truss replica member of the same production specification as the truss members constituting the truss; sending, by an ultrasonic stress detection device of the same model as any deployed ultrasonic stress detection device, ultrasonic waves at the specified ultrasonic frequency to the specified test locations of the truss replica member while the truss replica member is in a zero stress state to obtain the current instance of ultrasonic wave propagation time; determining the ultrasonic wave propagation time for the zero stress state based on the average of the specified number of instances of ultrasonic wave propagation time; the acoustic-elastic coefficient at any specified ultrasonic frequency is determined by: applying different axial stresses to the truss replica member, and sending, by an ultrasonic stress detection device of the same model as any deployed ultrasonic stress detection device, ultrasonic waves at the specified ultrasonic frequency to the specified test locations of the truss replica member while the truss replica member is in each applied axial stress to obtain the ultrasonic wave propagation time at the specified ultrasonic frequency under the axial stress; obtaining the acoustic-elastic coefficient of the truss replica member at the specified ultrasonic frequency based on the obtained ultrasonic wave propagation times at the specified ultrasonic frequency under each axial stress; determining the acoustic-elastic coefficient of the truss replica member as the acoustic-elastic coefficient of the truss at the specified ultrasonic frequency.

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