Bolt preload fitting information acquisition and optimization methods, terminals and media

Abstract

This invention provides a method and optimization method for acquiring bolt preload fitting information, a terminal, and a computer storage medium for acquiring bolt preload fitting information. The method for acquiring preload fitting information includes: based on the bolt's stress loading strategy, performing a preload acquisition process at each loading stage to obtain a preload value corresponding to each target stress value; and acquiring bolt preload fitting information based on each target stress value and its corresponding preload value. The method for optimizing preload fitting information includes: based on the bolt's stress load and the initial number of loading stages, repeatedly executing the preload fitting information acquisition and optimization process; during repeated execution, updating the number of loading stages based on the execution results to update the stress loading strategy, thereby acquiring optimized preload fitting information. This allows the preload fitting information to better match the actual information, improving the accuracy of the preload fitting information.

Description

Technical Field

[0001] This invention relates to the field of preload measurement, and more particularly to a method and optimization method for obtaining and optimizing bolt preload fitting information, a terminal, and a computer storage medium. Background Technology

[0002] Bolt preload is the preload generated along the bolt's axis under external stress (such as tightening torque, tensile force, etc.). Since the characteristics of bolt preload affect the connection quality and consequently the stability of equipment or buildings, it is necessary to determine the magnitude of each preload generated by the bolt under load stress before use. Currently, the commonly used method for measuring preload is often through a torque wrench. However, torque wrenches have a relatively large error, typically within a 30% error range. Therefore, it is impossible to accurately obtain the fitting relationship between bolt preload and stress, nor can it directly obtain the preload information corresponding to any stress value borne by the bolt within its maximum load range.

[0003] Therefore, how to accurately and efficiently obtain the fitting information between bolt external stress and preload has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a method and optimization method for obtaining and optimizing bolt preload fitting information, a terminal and a computer storage medium, which can solve the problems in the prior art that cannot accurately obtain the fitting relationship between bolt preload and bearing stress, resulting in the inability to directly obtain the preload information corresponding to any stress value of the bolt within the maximum load range.

[0005] To achieve the above and other related objectives, the first aspect of the present invention provides a method for obtaining bolt preload fitting information, comprising: acquiring a stress loading strategy and an initial ultrasonic waveform of the bolt; the stress loading strategy includes target stress values ​​corresponding to each loading stage; performing a preload acquisition process at each loading stage to obtain a preload value corresponding to each target stress value; and acquiring bolt preload fitting information based on each target stress value and the corresponding preload value; wherein the preload acquisition process includes: applying stress to the bolt; comparing the stress sampling value acquired at each sampling time with the current target stress value during the stress loading process; acquiring the current waveform of the bolt when the stress sampling value reaches the target stress value; acquiring the phase difference between the current waveform and the initial waveform to acquire the current preload value of the bolt based on the phase difference; and updating the current target stress value based on the stress loading strategy to re-execute the preload acquisition process based on the new current target stress value.

[0006] In one embodiment of the present invention, acquiring the current waveform of the bolt includes: pausing the stress loading process, maintaining the loaded stress at the current target stress value, and acquiring the current ultrasonic signal of the bolt to obtain the current waveform of the bolt.

[0007] In one embodiment of the present invention, the acquisition of the current waveform of the bolt further includes: repeatedly acquiring ultrasonic signals, performing average processing on each acquired ultrasonic signal, and using the processed ultrasonic signal as the current waveform.

[0008] In one embodiment of the present invention, obtaining the phase difference between the current waveform and the initial waveform includes: determining the same identifier waveform in the current waveform and the initial waveform, obtaining the current phase of the identifier waveform in the current waveform, obtaining the initial phase of the identifier waveform in the initial waveform, and extracting the phase difference between the current phase and the initial phase of the identifier waveform as the phase difference between the current waveform and the initial waveform.

[0009] In one embodiment of the present invention, after obtaining the initial ultrasonic waveform, the bolt preload fitting information acquisition method further includes: determining a characteristic waveform segment in the initial waveform, calibrating the characteristic waveform segment to obtain waveform calibration information; and, based on the waveform calibration information, extracting the characteristic waveform segment in the current waveform, and obtaining the phase difference between the current waveform and the initial waveform based on the phase difference of the characteristic waveform segment in the current waveform and in the initial waveform.

[0010] In a second aspect, the present invention also provides a method for optimizing bolt preload fitting information, comprising: acquiring the stress load of the bolt and the initial number of loading stages; repeatedly executing a preload fitting information acquisition and optimization process based on the stress load to acquire bolt preload fitting information; wherein the preload fitting information acquisition and optimization process comprises: determining a current stress loading strategy based on the current number of loading stages and the stress load; acquiring current preload fitting information using any of the bolt preload fitting information acquisition methods described above based on the current stress loading strategy; acquiring a preload fitting difference based on the current preload fitting information and the previous preload fitting information; detecting whether the preload fitting difference is greater than a fitting difference threshold; if so, increasing the number of loading stages; if not, exiting; updating the current number of loading stages based on the increased number of loading stages, and continuing to execute the preload fitting information acquisition and optimization process based on the new current number of loading stages.

[0011] In one embodiment of the present invention, obtaining the preload fitting difference based on the current preload fitting information and the previous preload fitting information includes: extracting the preload difference value corresponding to each stress value of the current preload fitting information and the previous preload fitting information, and obtaining the current preload fitting difference based on each preload difference value.

[0012] In one embodiment of the present invention, the stress load is divided into equal parts according to the current number of loading stages; the stress values ​​corresponding to the endpoints of each division are taken as the target stress values ​​corresponding to each loading stage from front to back, in descending order.

[0013] In a third aspect, the present invention also provides a terminal, comprising: a processor and a memory; the memory for storing a computer program, and the processor for executing the computer program stored in the memory to execute the bolt preload fitting information acquisition method or the bolt preload fitting information optimization method as described above.

[0014] In a fourth aspect, the present invention also provides a computer storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, it implements either the bolt preload fitting information acquisition method or the bolt preload fitting information optimization method as described above.

[0015] As described above, the bolt preload fitting information acquisition and optimization method, terminal, and computer storage medium provided by the present invention are based on a stress loading strategy including each target stress value. When the loaded stress reaches each target stress value, the corresponding preload value is obtained by using ultrasonic phase difference. Based on each target stress value and the corresponding preload value, bolt preload fitting information is obtained. This makes the sampling point distribution of the preload fitting information more uniform, and the sampling point distribution can be adjusted according to the distribution of target stress values ​​in the loading strategy. This makes the preload fitting information more consistent with the real information, thereby improving the accuracy of bolt preload fitting information. Attached Figure Description

[0016] Figure 1 The diagram shows a structural schematic of a preload measurement system applicable to the bolt preload fitting information acquisition method described in this invention in one embodiment.

[0017] Figure 2 The diagram shown is a flowchart of one embodiment of the bolt preload fitting information acquisition method of the present invention;

[0018] Figure 3 This is a flowchart illustrating step S500 in the bolt preload fitting information acquisition method of the present invention in one embodiment.

[0019] Figure 4 The diagram shown is a flowchart of another embodiment of the bolt preload fitting information acquisition method of the present invention;

[0020] Figure 5 The diagram shown is a flowchart of an embodiment of the bolt preload fitting information optimization method of the present invention;

[0021] Figure 6 This is a flowchart illustrating step S20 in one embodiment of the bolt preload fitting information optimization method of the present invention.

[0022] Figure 7 The diagram shown is a structural schematic of the terminal described in one embodiment of the present invention.

[0023] Component designation explanation

[0024] 100 Preload Measurement System

[0025] 101 Main Control Unit

[0026] 102 Stress Loading Element

[0027] 103 Stress Measurement Unit

[0028] 104 Ultrasonic Acquisition Unit

[0029] 40 terminals.

[0030] 41 Memory

[0031] 42 processors Detailed Implementation

[0032] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention, and are therefore not intended to be considered as drawings.

[0034] To facilitate understanding of the technical solutions and effects in this application, the following brief description is provided:

[0035] Preload fitting information is the correspondence between the preload generated by the bolt under external load and the external load.

[0036] Example 1

[0037] To address the technical problems existing in the prior art, the present invention provides a method for obtaining preload fitting information based on a preload measurement system, thereby obtaining preload fitting information of bolts.

[0038] Specifically, the preload measuring system is as follows: Figure 1 As shown, the system includes a main control unit 101, a stress loading unit 102, a stress measurement unit 103, and an ultrasonic acquisition unit 104. The stress loading unit 102 applies axial stress to the bolt. The stress measurement unit 103 includes a stress sensor, such as a stress plate, to measure the axial stress on the bolt. The ultrasonic acquisition unit 104 includes an ultrasonic detection component, such as a piezoelectric ultrasonic wafer, which transmits and receives ultrasonic signals to acquire phase information of the ultrasonic signals, thereby obtaining the bolt's preload based on the phase change of the ultrasonic signals. The main control unit 101 is sequentially connected to the stress loading unit 102, the stress measurement unit 103, and the ultrasonic acquisition unit 104, and coordinates the operation of each unit to execute the preload fitting information acquisition method.

[0039] Please see Figure 2 The diagram shows a flowchart of the bolt preload fitting information acquisition method in one embodiment; as shown below. Figure 2 As shown, the method includes:

[0040] S100, obtain the stress loading strategy for the bolt;

[0041] The stress loading strategy is a scheme for varying the axial stress applied to the bolt, including each loading stage and the target stress value corresponding to each loading stage, which is the stress value to be loaded onto the bolt in each loading stage.

[0042] In this embodiment, the target stress value is a set of values ​​that increase sequentially, and the maximum value is not greater than the stress value of the bolt stress load; wherein, the bolt stress load is the maximum stress value borne by the bolt.

[0043] Optionally, the stress loading strategy is a stress step curve with the same step size, that is, the stress step size between the target stress values ​​corresponding to adjacent loading stages is equal, so that each target stress value is evenly distributed within the bolt stress load range.

[0044] S300, acquire the initial ultrasonic waveform of the bolt;

[0045] Specifically, before acquiring the preload fitting information of the bolt, the ultrasonic acquisition unit is controlled to acquire the ultrasonic signal of the bolt to obtain the initial waveform of the bolt.

[0046] S500, based on the stress loading strategy, a preload acquisition process is performed in each loading stage to obtain the preload value corresponding to each target stress value;

[0047] In this embodiment, for a single loading stage, the preload acquisition process, when specifically executed, is as follows: Figure 3 As shown, it includes the following sub-steps:

[0048] S501, Determine the current target stress value;

[0049] Specifically, based on the stress loading strategy, the target stress value corresponding to the current loading stage is determined as the current target stress value.

[0050] For example, when the preload acquisition process is performed on the bolt for the first time, the current target stress value is the target stress value corresponding to the first loading stage in the stress loading strategy.

[0051] S502, apply stress to the bolt, and simultaneously acquire the stress sampling value of the bolt at each sampling time, and compare the stress sampling value with the current target stress value; when the stress sampling value reaches the target stress value, acquire the current waveform of the bolt;

[0052] Specifically, after stress loading is initiated, the stress applied to the bolt is continuously increased, causing the bolt to bear an increasing amount of stress. During this stress increase, the stress measurement unit is controlled to collect the actual stress value borne by the bolt at each sampling moment, which is used as the stress sampling value of the bolt at the corresponding moment. The stress sampling value is compared with the current target stress value. When the stress sampling value is less than the current target stress value, the stress loading process continues. When the stress sampling value reaches the current target stress value, the stress loading process is paused, maintaining the stress applied to the bolt at the current target stress value. The ultrasonic acquisition unit is then controlled to collect the current ultrasonic signal of the bolt to obtain its current waveform.

[0053] Optionally, the method for acquiring the current waveform further includes: when the stress applied to the bolt reaches the current target stress value, controlling the ultrasonic acquisition unit to repeatedly acquire the ultrasonic signal of the bolt n times, performing average processing on each acquired ultrasonic signal, and using the processed ultrasonic signal as the current waveform to improve the accuracy of the acquired current waveform; wherein, optionally, n is any integer from 3 to 6.

[0054] S503, obtain the phase difference between the current waveform and the initial waveform;

[0055] Specifically, a common identifier waveform is determined in the current waveform and the initial waveform, and the current phase of the identifier waveform in the current waveform and the initial phase of the identifier waveform in the initial waveform are obtained; the phase difference between the current phase and the initial phase of the identifier waveform is extracted as the phase difference between the current waveform and the initial waveform of the bolt.

[0056] S504, Based on the phase difference, obtain the current preload value of the bolt;

[0057] Based on the phase difference between the current waveform and the initial waveform and the propagation speed of the ultrasonic wave, the preload value of the bolt is calculated and used as the preload value corresponding to the current target stress value.

[0058] In one specific embodiment, the calculation of the bolt preload value based on the phase difference and the propagation speed of the ultrasonic wave is as follows:

[0059]

[0060] ΔL=Δt·V

[0061] Δt=f(ω)

[0062] Where F is the bolt preload; E is the elastic modulus of the bolt material; S is the bolt cross-sectional area; ΔL is the bolt deformation; and L is the bolt length. Δt is the acoustic time difference extracted from the phase difference; ω is the phase difference; and V is the propagation speed of the ultrasonic wave in the bolt being tested. Therefore, the bolt preload value is proportional to the acoustic time difference as a linear function.

[0063] S505, based on the stress loading strategy, update the current target stress value, and re-execute the preload acquisition process based on the new current target stress value.

[0064] Specifically, in the stress loading strategy, the loading stage that follows the current loading stage is taken as the new current loading stage, and the target stress value corresponding to the following stage is taken as the new current target stress value. Based on the new current target stress value, the above steps S501 to S505 are re-executed to obtain a new preload value.

[0065] Repeat steps S501 to S505 until exiting, to obtain the preload value corresponding to each target stress value.

[0066] S700, based on each of the target stress values ​​and the corresponding preload values, obtain the preload fitting information of the bolt.

[0067] Specifically, each target stress value and its corresponding preload value are treated as a single data set; based on each data set, a linear fitting method is used to construct a fitting curve between bolt preload and stress, which serves as the bolt preload fitting information.

[0068] The bolt preload fitting information acquisition method provided in this embodiment is based on a stress loading strategy. When the loaded stress reaches each target stress value, the corresponding preload value is obtained using ultrasonic phase difference. Based on each target stress value and the corresponding preload value, bolt preload fitting information is obtained. This makes the sampling point distribution of the preload fitting information more uniform, and the sampling point distribution can be adjusted according to the distribution of target stress values ​​in the loading strategy. This makes the preload fitting information more consistent with the real information, thereby improving the accuracy of bolt preload fitting information.

[0069] Example 2

[0070] Please see Figure 4 The diagram shows a flowchart of the bolt preload fitting information acquisition method in another embodiment; as shown below. Figure 4 As shown, the method for obtaining bolt preload fitting information is similar to... Figure 2 The methods shown are basically the same, except that after performing step S300, the method further includes:

[0071] S400, determine the characteristic waveform segment in the initial waveform and calibrate the characteristic waveform segment to obtain waveform calibration information;

[0072] Specifically, after obtaining the initial ultrasonic waveform of the bolt, a characteristic waveform segment with identification features is selected from the initial waveform, and the waveform information of the characteristic waveform segment is read as the waveform calibration information of the bolt's ultrasonic waves.

[0073] In one specific embodiment, a gate calibration line segment is defined, and the waveform segment intersecting with the calibration line segment in the initial waveform is selected as a feature waveform segment to read the waveform information of the feature waveform segment, including but not limited to one or more of the following: horizontal distance, vertical distance, waveform height, or other waveform parameters.

[0074] Based on step S500, the bolt preload fitting information acquisition method in this embodiment further includes, when executing S303:

[0075] Based on the waveform calibration information, the feature waveform segment is extracted from the current waveform and used as the identifier waveform. The phase difference between the current waveform and the initial waveform is obtained based on the phase difference of the feature waveform segment in the current waveform and in the initial waveform.

[0076] The bolt preload fitting information acquisition method provided in this embodiment calibrates the characteristic waveform segments in the initial waveform of the bolt to obtain calibration information, and extracts the characteristic waveform segments in the current waveform of the bolt based on the calibration information. Based on the same characteristic waveform segments in the current waveform and the initial waveform, the waveform phase difference between the initial waveform and the current waveform of the bolt can be extracted, thereby improving the accuracy of waveform phase difference extraction, and thus improving the accuracy of preload value and preload fitting information acquisition.

[0077] Example 3

[0078] To address the technical problems existing in the prior art, the present invention provides a method for optimizing bolt preload fitting information. While acquiring bolt preload fitting information, the method optimizes the acquired preload fitting information, thereby improving the accuracy and fitting efficiency of the acquired preload fitting information.

[0079] Please see Figure 5 The diagram shows a flowchart of the bolt preload fitting information optimization method in one embodiment; as shown below. Figure 5 As shown, the method includes;

[0080] S10, obtain the stress load on the bolt and the number of initial loading stages;

[0081] Specifically, based on the bolt type, the stress load of the bolt is determined, that is, the maximum stress value that the bolt can bear; the number of initial loading stages is preset, and the number of stages of stress to be applied to the bolt is an integer not less than 5.

[0082] S20, Based on the stress load, the process of collecting and optimizing the preload fitting information is repeated to obtain the preload fitting information of the bolt;

[0083] In this embodiment, this step is performed as follows: Figure 6 As shown, it includes the following sub-steps:

[0084] S21, Based on the current number of loading stages and the stress load, determine the current stress loading strategy;

[0085] Specifically, the current number of loading stages is obtained; based on the current number of loading stages, the stress load is divided into equal parts, and the stress values ​​corresponding to the endpoints of each division are taken from largest to smallest as the target stress values ​​corresponding to each loading stage from front to back, thereby determining the current stress loading strategy.

[0086] It should be noted that when performing the first acquisition and optimization process of the preload fitting information, the current loading stage number is the initial loading stage number.

[0087] S22, Based on the current stress loading strategy, the preload fitting information acquisition method is used to obtain the current preload fitting information;

[0088] Specifically, based on the current stress loading strategy, the current preload fitting information is obtained using the preload fitting information acquisition method described above.

[0089] S23, based on the current preload fitting information and the previous preload fitting information, obtain the preload fitting difference; detect whether the preload fitting difference is greater than the fitting difference threshold. If so, increase the number of loading stages; otherwise, exit.

[0090] Specifically, the preload information corresponding to the same stress value is obtained from the current preload fitting information and the previous preload fitting information, and the difference between the two is extracted to obtain the preload difference between the current preload fitting information and the previous preload fitting information at each stress value. Based on each preload difference, the current preload fitting difference is obtained.

[0091] In one specific embodiment, the preload difference values ​​are accumulated and averaged to obtain the mean value of each preload difference value, which is used as the current preload fitting difference.

[0092] If the current preload force fitting difference is greater than a preset fitting difference threshold, then the number of loading stages is increased by a preset value to obtain a new number of loading stages.

[0093] Optionally, the preset value is any integer from 1 to 3.

[0094] It should be noted that during the first collection and optimization process of the preload fitting information, the previous preload fitting information is a default information.

[0095] S24, based on the increased number of loading stages, update the current number of loading stages, and repeat S21 to S24 based on the new current number of loading stages.

[0096] Repeat the above process until exiting, and use the final preload fitting information as the optimized preload fitting information.

[0097] The bolt preload fitting information optimization method provided in this embodiment detects the fitting difference between the current preload fitting information and the previous preload fitting information. When the fitting difference is large, the number of loading stages is increased and the stress loading strategy is updated to perform more accurate preload acquisition. This improves the accuracy of preload fitting information acquisition and the fitting efficiency of preload fitting information, avoiding problems such as low fitting efficiency caused by too many stress loading stages.

[0098] Example 4

[0099] To address the technical problems existing in the prior art, the present invention also provides a terminal; please refer to [link / reference]. Figure 7 The diagram shown is a structural schematic of the terminal in one embodiment.

[0100] like Figure 7 As shown, the terminal 40 includes a memory 41 and a processor 42.

[0101] The memory 41 is used to store computer programs: the processor 42 runs the computer programs to execute the bolt preload fitting information acquisition method or the bolt preload fitting information optimization method as described above.

[0102] Optionally, the number of memories 41 can be one or more, and the number of processors 42 can be one or more. Figure 7 Each example is taken as an instance.

[0103] Optionally, the processor 42 may, according to the steps in the bolt preload fitting information acquisition method described above, load one or more instructions corresponding to the process of the application into the memory 41, and the processor 42 may run the application stored in the first memory 41, thereby implementing each step in the bolt preload fitting information acquisition method described above; or the processor 42 may, according to the steps in the bolt preload fitting information optimization method described above, load one or more instructions corresponding to the process of the application into the memory 41, and the processor 42 may run the application stored in the first memory 41, thereby implementing each step in the bolt preload fitting information optimization method described above.

[0104] Optionally, the memory 41 includes, but is not limited to, high-speed random access memory and non-volatile memory. For example, one or more disk storage devices, flash memory devices, or other non-volatile solid-state storage devices; the processor 42 may include, but is not limited to, a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0105] Optionally, the processor 42 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0106] Example 5

[0107] To address the technical problems existing in the prior art, the present invention also provides a computer-readable storage medium storing a computer program thereon, which, when called by a processor, implements the bolt preload fitting information acquisition method or the bolt preload fitting information optimization method as described above.

[0108] A computer-readable storage medium can be a tangible device capable of holding and storing instructions used by an instruction execution device. Computer-readable storage media can be, for example, (but not limited to) electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, and mechanical encoding devices.

[0109] The computer-readable program described herein can be downloaded from a computer-readable storage medium to various computing / processing devices, or downloaded via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network, to an external computer or external storage device. A network adapter card or network interface in each computing / processing device receives computer-readable program instructions from the network and forwards these instructions to the computer-readable storage medium in the respective computing / processing device.

[0110] The computer program instructions used to perform the operations of this application may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, integrated circuit configuration data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and procedural programming languages ​​such as the "C" language or similar programming languages.

[0111] Computer-readable program instructions may execute entirely on a user's computer, partially on a user's computer, as a standalone software package, partially on a user's computer and partially on a remote computer, or entirely on a remote computer or server. In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is customized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of this application.

[0112] In summary, the bolt preload fitting information acquisition method and optimization method, terminal, and computer storage medium provided by this invention, based on a stress loading strategy including each target stress value, utilize ultrasonic phase difference to acquire the corresponding preload value when the loaded stress reaches each target stress value. Based on each target stress value and the corresponding preload value, bolt preload fitting information is acquired, making the sampling point distribution of the preload fitting information more uniform, thus making the preload fitting information more closely match the real information and improving the accuracy of bolt preload fitting information acquisition. Furthermore, by acquiring preload fitting information based on the bolt preload fitting information acquisition method, and detecting the fitting difference between the current preload fitting information and the previous preload fitting information, when the fitting difference is large, the number of loading stages is increased and the stress loading strategy is updated to perform more accurate preload acquisition. This improves the accuracy of preload fitting information acquisition and the fitting efficiency of preload fitting information, avoiding problems such as low fitting efficiency due to too many stress loading stages.

[0113] Therefore, the bolt preload fitting information acquisition method and optimization method, terminal and computer storage medium provided by the present invention not only improve the accuracy of bolt preload fitting information acquisition, but also improve the fitting efficiency of preload fitting information, realizing the accuracy and efficiency of preload fitting information acquisition; the present invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0114] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for obtaining bolt preload fitting information, characterized in that, include: Obtain the stress loading strategy and initial ultrasonic waveform of the bolt; The stress loading strategy includes target stress values ​​corresponding to each loading stage; the initial ultrasonic waveform is acquired before acquiring the bolt preload fitting information; in the initial waveform, a characteristic waveform segment with identification features is selected, and the waveform information of the characteristic waveform segment is read as the waveform calibration information of the bolt ultrasonic wave; A preload acquisition process is performed at each loading stage to obtain the preload value corresponding to each target stress value; Based on the target stress values ​​and the corresponding preload values, the preload fitting information of the bolt is obtained; The preload acquisition process includes: Stress is applied to the bolt; during the stress loading process, the stress sampling values ​​collected at each sampling time are compared with the current target stress value; when the stress sampling value reaches the target stress value, the current waveform of the bolt is collected; Obtain the phase difference between the current waveform and the initial waveform, and based on the phase difference, obtain the current preload value of the bolt; obtaining the phase difference between the current waveform and the initial waveform includes: Based on the waveform calibration information, the feature waveform segment is extracted from the current waveform and used as the identifier waveform; the current phase of the identifier waveform in the current waveform and the initial phase of the identifier waveform in the initial waveform are obtained, and the phase difference between the current phase and the initial phase of the identifier waveform is extracted as the phase difference between the current waveform and the initial waveform. Based on the stress loading strategy, the current target stress value is updated, and the preload acquisition process is re-executed based on the new current target stress value.

2. The method for obtaining bolt preload fitting information according to claim 1, characterized in that, The current waveform of the acquisition bolt includes: The stress loading process is paused to maintain the stress at the current target stress value, and the current ultrasonic signal of the bolt is acquired to obtain the current waveform of the bolt.

3. The method for obtaining bolt preload fitting information according to claim 2, characterized in that, The current waveform of the acquisition bolt also includes: The ultrasonic signals are repeatedly acquired, and the acquired ultrasonic signals are averaged. The processed ultrasonic signals are then used as the current waveform.

4. A method for optimizing bolt preload fitting information, characterized in that, include: Obtain the stress load on the bolt and the number of initial loading stages; Based on the stress load, the preload fitting information acquisition and optimization process is repeatedly executed to obtain the bolt preload fitting information; wherein, the preload fitting information acquisition and optimization process includes: Based on the current number of loading stages and the stress load, determine the current stress loading strategy; Based on the current stress loading strategy, the current preload fitting information is obtained by the bolt preload fitting information acquisition method as described in any one of claims 1 to 3. Based on the current preload fitting information and the previous preload fitting information, the preload fitting difference is obtained; it is detected whether the preload fitting difference is greater than the fitting difference threshold. If so, the number of loading stages is increased; otherwise, the process is exited. Based on the increased number of loading stages, the current number of loading stages is updated so that the acquisition and optimization process of the preload fitting information can continue based on the new current number of loading stages.

5. The bolt preload fitting information optimization method according to claim 4, characterized in that, The step of obtaining the preload fitting difference based on the current preload fitting information and the previous preload fitting information includes: Extract the current preload fitting information and the previous preload fitting information to the preload difference corresponding to each stress value, and obtain the current preload fitting difference based on each preload difference.

6. The bolt preload fitting information optimization method according to claim 5, characterized in that, Based on the current number of loading stages, the stress load is divided into equal parts; the stress values ​​corresponding to the endpoints of each division are taken from largest to smallest as the target stress values ​​corresponding to each loading stage from front to back.

7. A terminal, characterized in that, include: Processor and memory; The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to perform the bolt preload fitting information acquisition method as described in any one of claims 1 to 3 or the bolt preload fitting information optimization method as described in claims 4 to 6.

8. A computer storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the bolt preload fitting information acquisition method as described in any one of claims 1 to 3 or the bolt preload fitting information optimization method as described in claims 4 to 6.

Images