Ultrasonic transmission detection signal reconstruction method for multi-curve variable-thickness composite material blade

Abstract

The invention relates to the technical field of composite material detection, in particular to a multi-curve thickened composite material blade ultrasonic transmission detection signal reconstruction method. Comprising the following steps: driving a transmitting transducer and a receiving transducer to perform coaxial ultrasonic transmission scanning on the multi-curve thickened composite material blade according to a set detection point cloud scanning track and detection point cloud density; an ultrasonic signal reconstruction unit is used for recording an ultrasonic transmission signal of each detection position point and a position signal corresponding to the ultrasonic transmission signal, and a plurality of detection point cloud signals are generated; solving a corresponding acoustic stretching coefficient according to the ultrasonic transmission signal of each detection position point to obtain a reconstructed ultrasonic transmission signal point cloud and a reconstructed acoustic stretching coefficient point cloud; and the acoustic stretching coefficient point cloud is utilized to reconstruct the ultrasonic transmission method detection signal of the multi-curve variable-thickness composite material blade which is subsequently scanned and detected. According to the method, the rationality and accuracy of ultrasonic signal reconstruction of the multi-curve variable-thickness composite material blade can be improved, and the reliability of a detection result is improved.

Description

Technical Field

[0001] The present application relates to the technical field of composite material detection, and particularly to a method for reconstructing ultrasonic transmission detection signals of multi-curved and variable-thickness composite material blades. Background Art

[0002] In the existing ultrasonic signal reconstruction method in ultrasonic transmission detection, it is based on the acoustic attenuation behavior of the incident sound wave in the thickness direction of the detected part to obtain the transmission signal of the ultrasonic wave propagation path at the detection point position The main deficiencies are as follows: 1) When the thickness of the detected part changes, it will also change, and when there are defects in the sound wave propagation direction, it will also change, thus interfering with the discrimination of defects and easily causing missed detections and misjudgments; 2) For abnormally complex multi-curved and variable-thickness composite material blades, the acoustic attenuation at each detection position point will be different, which will also cause changes, and further interfere with the changes of caused by differentiating defects, thus easily causing missed detections and misjudgments. As an improvement, acoustic attenuation compensation is performed according to the change of the thickness of the detected part to weaken the influence brought by the change of the thickness of the detected part to and suppress the influence of variable thickness change on the detection and discrimination accuracy of defects. However, its main deficiencies are as follows: 1) For abnormally complex multi-curved and variable-thickness composite material blades, in the actual detection process, it is difficult to accurately obtain the thickness, its change, and the corresponding internal acoustic attenuation coefficient at each detection position point in advance through manual setting methods; 2) This kind of compensation is difficult to overcome the influence of multi-curves and surface states at different position points in the detected part on the ultrasonic signal. As a partial improvement, the thickness of the detected part at the current detection position point is measured in real time, but its significant deficiency is that it is difficult to realize thickness measurement by the ultrasonic penetration method, and when there are defects, it will also affect the measured thickness result, causing thickness mismeasurement, and thus the correct thickness value cannot be obtained. At the same time, this method is still difficult to overcome the influence of multi-curves, surface states, and internal states at different position points in the detected part on the attenuation of the ultrasonic penetration signal, and thus it is difficult to overcome the phenomenon of missed detection and misjudgment of defects. Summary of the Invention

[0003] The present application provides a method for reconstructing ultrasonic transmission detection signals of multi-curved and variable-thickness composite material blades to solve the problems in the above background art.

[0004] In a first aspect, the present application provides a method for reconstructing ultrasonic transmission detection signals of multi-curved and variable-thickness composite material blades, including: Driving the transmitting transducer and the receiving transducer to perform coaxial ultrasonic transmission scanning on the multi-curved and variable-thickness composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density; The ultrasonic signal reconstruction unit records the ultrasonic transmission signals and their corresponding position signals at each detection position point, generating multiple detection point cloud signals; Based on the ultrasonic transmission signals at each detection position point, the corresponding acoustic stretching coefficients are solved to obtain the reconstructed ultrasonic transmission signal point cloud and the acoustic stretching coefficient point cloud; The ultrasonic transmission method detection signals of the multi-curved thick composite material blade subsequently scanned and detected are reconstructed using the acoustic stretching coefficient point cloud.

[0005] Furthermore, before the driving transmitting transducer and the receiving transducer perform coaxial ultrasonic transmission method scanning on the multi-curved thick composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density, it further includes: According to the characteristics and detection requirements of the multi-curved thick composite material blade to be detected, the detection point cloud scanning trajectory is generated by the scanning control unit, and the detection point cloud density is set .

[0006] Furthermore, before the ultrasonic signal reconstruction unit records the ultrasonic transmission signals and their corresponding position signals at each detection position point to generate multiple detection point cloud signals, it further includes: Using the position of the ultrasonic transmission signal displayed by the ultrasonic signal display unit, the ultrasonic transmission signal recording range is set by the ultrasonic signal reconstruction unit.

[0007] Furthermore, the ultrasonic signal reconstruction unit records the ultrasonic transmission signals and their corresponding position signals at each detection position point to generate multiple detection point cloud signals, including: The ultrasonic signal reconstruction unit records the ultrasonic transmission signals at each detection position point in real time according to the set detection point cloud density and the set recording range of the ultrasonic transmission signal as well as their corresponding position signals in real time, and generates detection point cloud signals in real time; ; Until the transmitting transducer and the receiving transducer complete the scanning synchronously, the ultrasonic signal reconstruction unit generates a total of detection point cloud signals , , denoted by , …, constituted.

[0008] Furthermore, the corresponding acoustic stretching coefficients are solved based on the ultrasonic transmission signals at each detection position point to obtain the reconstructed ultrasonic transmission signal point cloud and the acoustic stretching coefficient point cloud, including: When When , is the minimum ultrasonic signal gain step, is an integer, is the peak value of is the reference peak value from the reference block; When save the acoustic stretching coefficient , and solve for in the reconstructed ultrasonic transmission signal point cloud according to , , is the ultrasonic signal redundancy; Use to form the reconstructed ultrasonic transmission signal point cloud and the acoustic stretching coefficient point cloud , , .

[0009] Furthermore, the reconstruction of the ultrasonic transmission method detection signal of the multi-curved thick composite material blade subsequently scanned and detected by using the acoustic stretching coefficient point cloud includes: Based on the acoustic stretching coefficient point cloud , realize the acoustic stretching of the ultrasonic transmission method detection signal point cloud of the multi-curved thick composite material blade subsequently scanned and detected, and obtain the reconstructed ultrasonic transmission method detection signal of the multi-curved thick composite material blade subsequently detected.

[0010] Furthermore, after the reconstruction of the ultrasonic transmission method detection signal of the multi-curved thick composite material blade subsequently scanned and detected by using the acoustic stretching coefficient point cloud, it further includes: Based on the reconstructed ultrasonic transmission method detection signal of the multi-curved thick composite material blade and its changes, realize the ultrasonic transmission method detection of the multi-curved thick composite material blade through signal indication and imaging display.

[0011] In a second aspect, the present application provides a device for reconstructing an ultrasonic transmission detection signal of a multi-curved thick composite material blade, including a transmitting transducer, a receiving transducer, an ultrasonic signal reconstruction unit, an ultrasonic signal display unit, and a scanning control unit; The device for reconstructing an ultrasonic transmission detection signal of the multi-curved thick composite material blade is used to implement the method for reconstructing an ultrasonic transmission detection signal of the multi-curved thick composite material blade as described above.

[0012] Furthermore, it further includes an ultrasonic transmitting unit, an ultrasonic receiving unit, a transmitting scanning unit, and a receiving scanning unit; The ultrasonic transmitting unit is used to provide a transmitting signal to the transmitting transducer, and the ultrasonic receiving unit is used to receive the ultrasonic transmission signal from the receiving transducer and preprocess the ultrasonic transmission signal; The transmitting scanning unit is used to drive the transmitting transducer to scan, and the receiving scanning unit is used to drive the receiving transducer to scan.

[0013] Further, the ultrasonic signal reconstruction unit is used to reconstruct the ultrasonic transmission signal preprocessed by the ultrasonic receiving unit.

[0014] The above technical solution of the present application has the following advantages: The method for reconstructing ultrasonic transmission detection signals of multi-curved thickened composite material blades provided in the first aspect of the present application is based on the transmission propagation attenuation behavior of ultrasonic waves in multi-curved thickened composite material blades. By establishing a detection point cloud, the ultrasonic transmission signals at each detection position point can be automatically reconstructed, significantly improving the rationality and accuracy of the reconstruction of ultrasonic transmission signals of multi-curved thickened composite material blades. Based on the reconstructed ultrasonic transmission signals, the interference of the curved surface, thickness, surface state, internal microstructure, acoustic attenuation change, etc. of the inspected part on the defect signal can be suppressed, thus significantly improving the accuracy of detecting defects in abnormally complex multi-curved thickened composite material blades by the ultrasonic transmission method, reducing the risk of missed detection and misjudgment of defects, and improving the reliability of the detection results.

[0015] It can be understood that the beneficial effects of the second aspect above can refer to the relevant descriptions in the first aspect above, and will not be repeated here. Description of the Drawings

[0016] In order to more clearly illustrate the specific implementation manners of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific implementation manners or the prior art. Obviously, the drawings in the following description are some implementation manners of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flowchart of the method for reconstructing ultrasonic transmission detection signals of multi-curved thickened composite material blades provided by the present application; Figure 2 It is a principle and device diagram of the method for reconstructing ultrasonic transmission detection signals of multi-curved thickened composite material blades provided by the present application; Figure 3 It is a point cloud acquisition diagram of the method for reconstructing ultrasonic transmission detection signals of multi-curved thickened composite material blades provided by the present application.

[0018] Reference numerals: 1, transmitting transducer; 2, receiving transducer; 3, ultrasonic transmitting unit; 4, ultrasonic receiving unit; 5, ultrasonic signal reconstruction unit; 6, ultrasonic signal display unit; 7, transmitting scanning unit; 8, receiving scanning unit; 9, scanning control unit; 10, workpiece to be inspected. Detailed implementation manners

[0019] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system architectures, technologies, etc. are presented in order to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0020] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0021] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0022] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that specific features, structures, or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Plurality" means "two or more".

[0023] The object of the present application is to address the ultrasonic transmission method detection requirements and existing deficiencies for abnormally complex multi-curved variable-thickness composite material blades, and propose a method for reconstructing ultrasonic transmission detection signals for multi-curved variable-thickness composite material blades, so as to improve the applicability, detection accuracy and reliability of the ultrasonic transmission method for multi-curved variable-thickness composite material blades, and reduce the risk of missed detection and misjudgment.

[0024] The following will further describe in detail the specific implementation manners of the present application in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0025] As Figure 1 shown, the embodiment of the present application provides a method for reconstructing ultrasonic transmission detection signals of a multi-curved thickened composite material blade, which specifically includes the following steps: driving the transmitting transducer and the receiving transducer to perform coaxial ultrasonic transmission scanning on the multi-curved thickened composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density; using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signals and their corresponding position signals at each detection position point, and generating a plurality of detection point cloud signals; solving the corresponding acoustic stretching coefficient according to the ultrasonic transmission signal at each detection position point to obtain the reconstructed ultrasonic transmission signal point cloud and acoustic stretching coefficient point cloud; using the acoustic stretching coefficient point cloud to reconstruct the ultrasonic transmission method detection signals of the multi-curved thickened composite material blade to be subsequently scanned and detected.

[0026] In some embodiments, before the driving the transmitting transducer and the receiving transducer to perform coaxial ultrasonic transmission scanning on the multi-curved thickened composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density, it further includes: generating a detection point cloud scanning trajectory through the scanning control unit according to the characteristics of the multi-curved thickened composite material blade to be detected and the detection requirements, and setting the detection point cloud density .

[0027] In some embodiments, before the using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signals and their corresponding position signals at each detection position point and generating a plurality of detection point cloud signals, it further includes: setting the recording range of the ultrasonic transmission signals through the ultrasonic signal reconstruction unit by using the position of the ultrasonic transmission signals displayed by the ultrasonic signal display unit .

[0028] In some embodiments, the using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signals and their corresponding position signals at each detection position point and generating a plurality of detection point cloud signals includes: using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signals at each detection position point in real time according to the set detection point cloud density and the set recording range of the ultrasonic transmission signals , and their corresponding position signals , and generating detection point cloud signals in real time ; until the transmitting transducer and the receiving transducer complete the scanning synchronously, the ultrasonic signal reconstruction unit generates a total of detection point cloud signals , , , denotes by , …, constitute.

[0029] In some embodiments, the method of solving the corresponding acoustic stretch coefficient according to the ultrasonic transmission signal of each detection position point to obtain the reconstructed ultrasonic transmission signal point cloud and acoustic stretch coefficient point cloud includes: hour, , is the minimum ultrasonic signal gain step, is an integer number, for The peak value, is the reference peak value from the comparison test block; when When the acoustic stretch coefficient is saved ,according to Solve the reconstructed ultrasonic transmission signal point cloud , , is the redundancy of ultrasonic signal; Constructing the reconstructed ultrasonic transmission signal point cloud Harmonic stretch coefficient point cloud , , .

[0030] In some embodiments, the method of reconstructing the ultrasonic transmission method detection signal of the multi-curved thickened composite material blade subsequently scanned and detected by using the acoustic stretch coefficient point cloud includes: , realize the acoustic stretching of the ultrasonic transmission method detection signal point cloud of the multi-bend thickened composite material blade that is subsequently scanned and detected, and obtain the reconstructed ultrasonic transmission method detection signal of the multi-bend thickened composite material blade that is subsequently detected .

[0031] In some embodiments, after reconstructing the ultrasonic transmission method detection signal of the multi-bend thickened composite material blade subsequently scanned and detected using the acoustic stretch coefficient point cloud, the method further includes: and its changes, and realize ultrasonic transmission detection of multi-curved and thickened composite blades through signal indication and imaging display.

[0032] The principle and hardware structure of the method and device for ultrasonic penetration detection signal reconstruction of multi-curved and thickened composite blades are as follows Figure 2 As shown, it mainly consists of a transmitting transducer 1, a receiving transducer 2, an ultrasonic transmitting unit 3, an ultrasonic receiving unit 4, an ultrasonic signal reconstruction unit 5, an ultrasonic signal display unit 6, a transmitting scanning unit 7, a receiving scanning unit 8, a scanning control unit 9, etc. The test piece 10 represents an extremely complex multi-curved variable thickness composite blade, in which: The transmitting transducer 1 is used to transmit ultrasonic signals to the workpiece 10 to be inspected. The receiving transducer 2 is used to receive the ultrasonic transmission signals from the workpiece 10 to be inspected. , The ultrasonic transmission signals formed by different thickness regions in the workpiece 10 to be inspected represent the th detection position point where the transmitting transducer 1 and the receiving transducer 2 are located, and its corresponding position coordinates on the workpiece 10 to be inspected are , and the superscript represents ultrasonic transmission. See Figure 2 and Figure 3 . The ultrasonic transmitting unit 3 is used to provide a transmitting signal to the transmitting transducer 1, and the ultrasonic receiving unit 4 is used to receive the ultrasonic transmission signals from the receiving transducer 2 , and perform preprocessing.

[0033] The ultrasonic signal reconstruction unit 5 is used to reconstruct the ultrasonic transmission signals preprocessed by the ultrasonic receiving unit 4 . Using the CPU and data processing capabilities of the ultrasonic signal reconstruction unit 5 itself, map and correlate the ultrasonic transmission signals and position signals obtained during the ultrasonic transmission method scanning of the workpiece 10 by the transmitting transducer 1 and the receiving transducer 2 and generate a detection point cloud signal , where respectively represent the position coordinates of the th detection point on the workpiece 10 to be inspected, and is the ultrasonic transmission signal corresponding to the th detection point.

[0034] The ultrasonic signal display unit 6 is used to perform signal display and / or imaging display on the ultrasonic transmission signals reconstructed by the ultrasonic signal reconstruction unit 5 , and at the same time provide a signal indication for setting the signal recording range of the ultrasonic signal reconstruction unit 5. By synchronously controlling the transmitting scanning unit 7 driven by the transmitting transducer 1 and the receiving scanning unit 8 driven by the receiving transducer 2 by the scanning control unit 9 according to the given detection point cloud scanning trajectory and detection point cloud density to perform an automatic ultrasonic transmission method scan on the workpiece 10 to be inspected. During the scan, the transmitting transducer 1 and the receiving transducer 2 are always coaxially aligned, and automatically obtain the detection point cloud signals at each detection position point , see Figure 3 .

[0035] The method for automatically obtaining the detection point cloud by the ultrasonic transmission method is as follows: According to the characteristics and detection requirements of the abnormally complex multi-curved surface variable-thickness composite material blade to be detected, generate a detection point cloud scanning trajectory through the scanning control unit 9. SeeFigure 3 The density of the detected point cloud is set by the scanning control unit 9 The recording range of the ultrasonic transmission signal is set by the ultrasonic signal reconstruction unit 5 using the position of the ultrasonic transmission signal displayed by the ultrasonic signal display unit 6 With the detection point cloud scanning trajectory generated by the scanning control unit 9, under the synchronous control of the scanning control unit 9, the transmitting scanning unit 7 and the receiving scanning unit 8 drive the transmitting transducer 1 and the receiving transducer 2 respectively to perform ultrasonic transmission scanning on the inspected part 10. At the same time, the ultrasonic signal reconstruction unit 5 records the ultrasonic transmission signal of each detection position point in real time according to the set density of the detection point cloud and the set recording range of the ultrasonic transmission signal and its corresponding position signal and generates a detection point cloud signal in real time until the transmitting transducer 1 and the receiving transducer 2 synchronously complete the scanning of the abnormally complex multi-curved variable-thickness composite material blade. The ultrasonic signal reconstruction unit 5 automatically generates a total of detection point cloud signals where , Here means composed of ,…, and the following " " has the same meaning

[0036] After the scanning is completed, the ultrasonic signal reconstruction unit 5 calculates the acoustic stretch coefficient according to the following steps based on the maximum peak value of : Step 1: Signal stretching: When , , , is the minimum ultrasonic signal gain step size, is an integer and its initial value is 1, is the reference peak value from the reference block and can be determined by the ultrasonic penetration test Step 2: Judgment of signal stretching effect: When , continue with Step 1 and increase the value of k by 1 on the original value; until when , save , where is the ultrasonic signal redundancy and can be determined by experiments

[0037] Calculate in the reconstructed ultrasonic transmission signal point cloud of , and use Constitute the reconstructed ultrasonic transmission signal point cloud and the acoustic stretching coefficient point cloud : Use the above formula to reconstruct the ultrasonic transmission method detection signal of the abnormally complex multi-curved and thickened composite material blade to be subsequently scanned and detected: Based on , achieve the acoustic stretching of the ultrasonic transmission method detection signal point cloud of the abnormally complex multi-curved and thickened composite material blade to be subsequently scanned and detected, and obtain the reconstructed ultrasonic transmission method detection signal of the abnormally complex multi-curved and thickened composite material blade to be subsequently detected , obtain the ultrasonic transmission method detection signal that better reflects the geometric and acoustic characteristics of the detected abnormally complex multi-curved and thickened composite material blade, and be used for more accurate ultrasonic transmission method detection of the abnormally complex multi-curved and thickened composite material blade; Based on and its changes, through signal indication and imaging display, realize the ultrasonic transmission detection of the abnormally complex multi-curved and thickened composite material blade

[0038] The embodiment of the present application also provides a device for reconstructing the ultrasonic transmission detection signal of a multi-curved and thickened composite material blade, including a transmitting transducer, a receiving transducer, an ultrasonic signal reconstruction unit, an ultrasonic signal display unit, and a scanning control unit; the device for reconstructing the ultrasonic transmission detection signal of the multi-curved and thickened composite material blade is used to implement the method for reconstructing the ultrasonic transmission detection signal of the multi-curved and thickened composite material blade as described above

[0039] In some embodiments, it further includes an ultrasonic transmitting unit, an ultrasonic receiving unit, a transmitting scanning unit, and a receiving scanning unit; the ultrasonic transmitting unit is used to provide a transmitting signal to the transmitting transducer, the ultrasonic receiving unit is used to receive the ultrasonic transmission signal from the receiving transducer and preprocess the ultrasonic transmission signal; the transmitting scanning unit is used to drive the transmitting transducer to scan, and the receiving scanning unit is used to drive the receiving transducer to scan

[0040] In some embodiments, the ultrasonic signal reconstruction unit is used to reconstruct the ultrasonic transmission signal preprocessed by the ultrasonic receiving unit

[0041] This application is based on the transmission propagation behavior and sound attenuation principle of ultrasonic waves in composite material blades with extremely complex multi-curved surfaces and variable thicknesses. According to the curvature, thickness, surface and internal states, acoustic characteristics, and detection requirements of each different detection position in the composite material blades with extremely complex multi-curved surfaces and variable thicknesses, a method and device for reconstructing ultrasonic transmission detection signals of multi-curved and variable-thickness composite material blades are proposed, which can meet the accurate reconstruction of ultrasonic transmission detection signals of composite material blades with extremely complex multi-curved surfaces and variable thicknesses, taking into account the curvature, thickness, surface state, internal microstructure, acoustic characteristics, and detection requirements of each detection position point of the composite material blades with extremely complex multi-curved surfaces and variable thicknesses. Furthermore, it improves the rationality and accuracy of reconstructing ultrasonic transmission detection signals of composite material blades with extremely complex multi-curved surfaces and variable thicknesses, which is more conducive to distinguishing defect signals from the changes in ultrasonic transmission detection signals caused by the curvature, thickness, and internal microstructure of the blades themselves, improving the detection effect and defect detection ability of ultrasonic waves for composite material blades with extremely complex multi-curved surfaces and variable thicknesses; it can take into account different composite material blades and their requirements for defect ultrasonic detection, realize the intelligent reconstruction of ultrasonic transmission detection signals, and significantly improve the reconstruction efficiency, detection efficiency, and accuracy of detection results of ultrasonic transmission detection signals.

[0042] It should be noted that for the information interaction, execution process, etc. between the above-mentioned modules / units, since they are based on the same concept as the method embodiment of this application, their specific functions and the technical effects brought about can be specifically referred to in the method embodiment part, and will not be elaborated here.

[0043] Those skilled in the art can clearly understand that for the convenience and conciseness of description, only the above-mentioned division of each functional unit and module is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above-mentioned system can refer to the corresponding processes in the foregoing method embodiment and will not be elaborated here.

[0044] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. An ultrasonic transmission detection signal reconstruction method for multi-curved and variable-thickness composite material blades, characterized in that Including: Driving the transmitting transducer and the receiving transducer to perform coaxial ultrasonic transmission method scanning on the multi-curved thick composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density; Using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signal and its corresponding position signal at each detection position point, and generating a plurality of detection point cloud signals; Solving the corresponding acoustic stretching coefficient according to the ultrasonic transmission signal at each detection position point, and obtaining the reconstructed ultrasonic transmission signal point cloud and acoustic stretching coefficient point cloud; Using the acoustic stretching coefficient point cloud to reconstruct the ultrasonic transmission method detection signal of the multi-curved thick composite material blade subsequently scanned and detected.

2. The ultrasonic transmission detection signal reconstruction method for the multi-curved and variable-thickness composite material blade according to claim 1, wherein Before the driving the transmitting transducer and the receiving transducer to perform coaxial ultrasonic transmission method scanning on the multi-curved thick composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density, it further includes: According to the characteristics and detection requirements of the detected multi-curved thick composite material blade, a detection point cloud scanning trajectory is generated by the scanning control unit, and the detection point cloud density is set .

3. The ultrasonic transmission detection signal reconstruction method for the multi-curved and variable-thickness composite material blade according to claim 1, wherein Before the using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signal and its corresponding position signal at each detection position point, and generating a plurality of detection point cloud signals, it further includes: Set the recording range of the ultrasonic transmission signal through the ultrasonic signal reconstruction unit using the position of the ultrasonic transmission signal displayed by the ultrasonic signal display unit .

4. The ultrasonic transmission detection signal reconstruction method for the multi-curved thickening composite material blade according to claim 1, wherein The using the ultrasonic signal reconstruction unit to record the ultrasonic transmission signal and its corresponding position signal at each detection position point, and generating a plurality of detection point cloud signals includes: The ultrasonic signal reconstruction unit records the ultrasonic transmission signals at each detection position point in real time according to the set detection point cloud density and the set ultrasonic transmission signal recording range, and records the ultrasonic transmission signals at each detection position point in real time and their corresponding position signals , and generates a detection point cloud signal in real time ; Until the scanning is completed with the transmitting transducer and the receiving transducer synchronized, the ultrasonic signal reconstruction unit generates a total of detected point cloud signals , , which are represented by ,…, and so on.

5. The ultrasonic transmission detection signal reconstruction method for multi-curved and variable-thickness composite material blades as described in claim 1, characterized in that, The solving the corresponding acoustic stretching coefficient according to the ultrasonic transmission signal at each detection position point, and obtaining the reconstructed ultrasonic transmission signal point cloud and acoustic stretching coefficient point cloud includes: When , , is the minimum ultrasonic signal gain step size, is an integer number, is the peak value of, is the reference peak value from the reference block; When the acoustic stretching coefficient is saved According to Solve for the in the reconstructed ultrasonic transmission signal point cloud , is the ultrasonic signal redundancy; Utilize to form the point cloud of the reconstructed ultrasonic transmission signal and the point cloud of the acoustic stretching coefficient , , .

6. The ultrasonic transmission detection signal reconstruction method for the multi-curved thickening composite material blade according to claim 1, characterized in that, The using the acoustic stretching coefficient point cloud to reconstruct the ultrasonic transmission method detection signal of the multi-curved thick composite material blade subsequently scanned and detected includes: Based on the acoustic stretching coefficient point cloud , realize the acoustic stretching of the ultrasonic transmission method detection signal point cloud of the multi-curved thick composite material blade to be subsequently scanned and detected, and obtain the ultrasonic transmission method detection signal after reconstruction of the multi-curved thick composite material blade to be detected .

7. The ultrasonic transmission detection signal reconstruction method for the multi-curved and variable-thickness composite material blade according to claim 1, wherein After the using the acoustic stretching coefficient point cloud to reconstruct the ultrasonic transmission method detection signal of the multi-curved thick composite material blade subsequently scanned and detected, it further includes: Ultrasonic transmission method detection signals after reconstruction of multi-curved thickened composite blades And their changes, through signal indication and imaging display, realize the ultrasonic transmission method detection of multi-curved thickened composite blades.

8. An ultrasonic transmission detection signal reconstruction device for a multi-curved and thickened composite material blade, characterized in that Including a transmitting transducer, a receiving transducer, an ultrasonic signal reconstruction unit, an ultrasonic signal display unit, and a scanning control unit; The multi-curved thick composite material blade ultrasonic transmission detection signal reconstruction device is used to implement the multi-curved thick composite material blade ultrasonic transmission detection signal reconstruction method according to any one of claims 1 to 7.

9. The ultrasonic transmission detection signal reconstruction device for multi-curved and variable-thickness composite material blades according to claim 8, characterized in that, It further includes an ultrasonic transmitting unit, an ultrasonic receiving unit, a transmitting scanning unit, and a receiving scanning unit; The ultrasonic transmitting unit is used to provide a transmitting signal to the transmitting transducer, and the ultrasonic receiving unit is used to receive the ultrasonic transmission signal from the receiving transducer and preprocess the ultrasonic transmission signal; The transmitting scanning unit is used to drive the transmitting transducer to scan, and the receiving scanning unit is used to drive the receiving transducer to scan.

10. The ultrasonic transmission detection signal reconstruction device for multi-curved thickened composite material blades according to claim 9, wherein, The ultrasonic signal reconstruction unit is used to reconstruct the ultrasonic transmission signal preprocessed by the ultrasonic receiving unit.

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