A method for reconstructing ultrasonic reflection detection signals of multi-curved and thickened composite blades

Abstract

The present application relates to the technical field of composite material detection, and in particular to a method for reconstructing ultrasonic reflection detection signals of multi-curved and thickened composite material blades, comprising: driving a transducer to perform ultrasonic reflection scanning on the multi-curved and thickened composite material blades according to a set detection point cloud scanning trajectory and detection point cloud density; using an ultrasonic signal reconstruction unit to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals; solving the corresponding acoustic stretching coefficient based on the ultrasonic reflection signal of each detection position point to obtain a reconstructed ultrasonic reflection signal point cloud and an acoustic stretching coefficient point cloud; using the acoustic stretching coefficient point cloud to reconstruct the ultrasonic reflection detection signal of the multi-curved and thickened composite material blades that are subsequently scanned and detected. The present application can improve the rationality and accuracy of ultrasonic signal reconstruction of multi-curved and thickened composite material blades, reduce the risk of missed defect detection and misjudgment of defects, and improve the reliability of the detection results.

Description

Technical Field

[0001] The present application relates to the technical field of composite material detection, and in particular to a method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite material blade. Background Art

[0002] The ultrasonic signal reconstruction method in the existing ultrasonic reflection detection method is based on the principle of integrating and summing the echo signals formed by the incident sound wave in the thickness direction of the detected object to obtain the detection point position. Ultrasonic wave propagation path echo signal The main shortcomings are: 1) When the thickness of the inspected part When changes, will also change, and when there is a defect in the direction of sound wave propagation, The sound attenuation of each detection position will also be different, which will also cause the sound attenuation of the blade to be different. The changes in As an improvement, the sound attenuation compensation is performed according to the thickness change of the inspected part, weakening the sound attenuation caused by the thickness change of the inspected part. The impact of the change in thickness inhibits the accuracy of defect detection and discrimination. However, its main shortcomings are: 1) For extremely complex multi-curved variable thickness composite blades, it is difficult to manually set the thickness of each detection point and its changes and the corresponding depth-direction sound attenuation coefficient in advance during the actual detection process; 2) This compensation is difficult to overcome the impact of the multi-curvature and surface conditions at different locations in the test piece on the ultrasonic signal. As a partial improvement, the thickness of the current test position of the test piece is measured in real time, but its significant shortcoming is that when defects occur, it will affect the actual thickness measurement results and cause thickness mismeasurement, and thus the correct thickness value cannot be obtained. At the same time, this method still cannot overcome the impact of the multi-curvature and surface conditions at different locations in the test piece on the ultrasonic signal, and thus it is difficult to overcome the phenomenon of missed defect detection. Summary of the Invention

[0003] The present application provides a method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade to solve the problems in the above-mentioned background technology.

[0004] In a first aspect, the present application provides a method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade, comprising:

[0005] The transducer is driven to perform ultrasonic reflection scanning on the multi-curved and thickened composite blade according to the set detection point cloud scanning trajectory and detection point cloud density;

[0006] The ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals;

[0007] Solve the corresponding acoustic stretch coefficient according to the ultrasonic reflection signal of each detection position point to obtain the reconstructed ultrasonic reflection signal point cloud and acoustic stretch coefficient point cloud;

[0008] The acoustic stretch coefficient point cloud is used to reconstruct the ultrasonic reflection detection signal of the multi-curved and thickened composite blade that is subsequently scanned and inspected.

[0009] Furthermore, before the driving transducer performs ultrasonic reflection scanning on the multi-curved and thickened composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density, the method further includes:

[0010] According to the characteristics and inspection requirements of the multi-curved and thickened composite blade being inspected, the scanning unit generates the inspection point cloud scanning trajectory and sets the inspection point cloud density. .

[0011] Furthermore, before the ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate a plurality of detection point cloud signals, the method further includes:

[0012] The ultrasonic signal position displayed by the ultrasonic signal display unit is used to set the ultrasonic reflection signal through the ultrasonic signal reconstruction unit. Record thickness range and .

[0013] Furthermore, the ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals, including:

[0014] Use the ultrasonic signal reconstruction unit to detect the point cloud density according to the settings and the ultrasonic reflection signal set Record thickness range and , real-time recording of ultrasonic reflection signals at each detection location and its corresponding position signal , and generate detection point cloud signals in real time ;

[0015] Until the transducer completes scanning of the multi-curved and thickened composite blade, the ultrasonic signal reconstruction unit generates Detection point cloud signals , , Indicated by ,…, constitute.

[0016] Furthermore, the method of solving the corresponding acoustic stretch coefficient according to the ultrasonic reflection signal of each detection position point to obtain the reconstructed ultrasonic reflection signal point cloud and acoustic stretch coefficient point cloud includes:

[0017] when hour, , is the minimum ultrasonic signal gain step, is an integer number, for The peak value, , The height of the screen signal displayed in the ultrasonic signal display unit;

[0018] when When the acoustic stretch coefficient is saved ,according to Solve the reconstructed ultrasonic reflection signal point cloud , , is the redundancy of ultrasonic signal;

[0019] use Constructing the reconstructed ultrasonic reflection signal point cloud Harmonic stretch coefficient point cloud , , .

[0020] Furthermore, the method of reconstructing the ultrasonic reflection detection signal of the multi-curved and thickened composite material blade subsequently scanned and detected by using the acoustic stretch coefficient point cloud includes:

[0021] Based on acoustic stretch coefficient point cloud , realize the acoustic stretching of the ultrasonic reflection detection signal point cloud of the multi-bend thickened composite material blade that is subsequently scanned and detected, and obtain the reconstructed ultrasonic reflection signal point cloud of the multi-bend thickened composite material blade that is subsequently detected .

[0022] Furthermore, after reconstructing the ultrasonic reflection detection signal of the multi-curved and thickened composite material blade subsequently scanned and detected using the acoustic stretch coefficient point cloud, the method further includes:

[0023] Ultrasonic reflection signal point cloud reconstructed based on multi-curved and thickened composite blade and its changes, and realize ultrasonic detection of multi-curved and thickened composite blades through signal indication and imaging display.

[0024] In a second aspect, the present application provides a device for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade, comprising a transducer, an ultrasonic signal reconstruction unit, an ultrasonic signal display unit, and a scanning unit;

[0025] The device for reconstructing ultrasonic reflection detection signals of a multi-bend and thickened composite material blade is used to implement the method for reconstructing ultrasonic reflection detection signals of a multi-bend and thickened composite material blade as described above.

[0026] Furthermore, it also includes an ultrasonic transmitting / receiving unit, which is used to provide a transmitting signal to the transducer and is also used to pre-process the ultrasonic reflection signal received by the transducer.

[0027] Furthermore, the ultrasonic signal reconstruction unit is used to reconstruct the ultrasonic reflection signal preprocessed by the ultrasonic transmitting / receiving unit.

[0028] The above technical solution of this application has the following advantages:

[0029] The first aspect of the present application provides a method for reconstructing ultrasonic reflection detection signals of multi-curved and variable-thickness composite blades. Based on the propagation behavior of ultrasonic waves in multi-curved and variable-thickness composite blades, the ultrasonic reflection signal of each detection position point can be automatically reconstructed by establishing a detection point cloud, which significantly improves the rationality and accuracy of ultrasonic signal reconstruction of multi-curved and variable-thickness composite blades. Based on the reconstructed ultrasonic signal, the interference of the curve, thickness, surface state, internal microstructure, sound attenuation changes, etc. of the inspected part on the defect signal can be suppressed, thereby significantly improving the accuracy of defect detection of abnormally complex multi-curved and variable-thickness composite blades, reducing the risk of missed defect detection and misjudgment, and improving the reliability of the detection results.

[0030] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 This is a flow chart of the ultrasonic reflection detection signal reconstruction method for multi-curved and thickened composite blades provided in this application;

[0033] Figure 2 Principle and device diagram of the ultrasonic reflection detection signal reconstruction method for multi-curved and thickened composite blades provided in this application;

[0034] Figure 3 This is a point cloud acquisition diagram of the ultrasonic reflection detection signal reconstruction method for multi-curved and thickened composite blades provided in this application.

[0035] Reference numerals: 1. transducer; 2. ultrasonic transmitting / receiving unit; 3. ultrasonic signal reconstruction unit; 4. ultrasonic signal display unit; 5. scanning unit; 6. test piece. DETAILED DESCRIPTION

[0036] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may 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 obscuring the description of the present application with unnecessary detail.

[0037] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0038] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0039] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of the present application include a particular feature, structure, or characteristic described in conjunction with that embodiment. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized. "Multiple" means "two or more."

[0040] The purpose of this application is to address the needs and shortcomings of ultrasonic reflection detection of extremely complex, multi-curved and thickened composite blades, and propose a method for reconstructing ultrasonic reflection detection signals of multi-curved and thickened composite blades, so as to improve the applicability, accuracy and reliability of ultrasonic reflection detection of multi-curved and thickened composite blades, and reduce the risk of missed detection and misjudgment.

[0041] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] like Figure 1 As shown, an embodiment of the present application provides a method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite material blade, which specifically includes the following steps: driving the transducer to perform ultrasonic reflection scanning on the multi-curved and thickened composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density; using an ultrasonic signal reconstruction unit to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals; solving the corresponding acoustic stretching coefficient according to the ultrasonic reflection signal of each detection position point to obtain a reconstructed ultrasonic reflection signal point cloud and an acoustic stretching coefficient point cloud; using the acoustic stretching coefficient point cloud to reconstruct the ultrasonic reflection detection signal of the multi-curved and thickened composite material blade that is subsequently scanned and detected.

[0043] In some embodiments, before the driving transducer performs ultrasonic reflection scanning on the multi-curved and thickened composite blade according to the set detection point cloud scanning trajectory and detection point cloud density, the method further includes: generating a detection point cloud scanning trajectory through a scanning unit and setting the detection point cloud density according to the characteristics of the detected multi-curved and thickened composite blade and the detection requirements. .

[0044] In some embodiments, the ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal, and before generating multiple detection point cloud signals, it also includes: using the ultrasonic signal display unit to display the ultrasonic signal position, and setting the ultrasonic reflection signal through the ultrasonic signal reconstruction unit. Record thickness range and .

[0045] In some embodiments, the ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals, including: using the ultrasonic signal reconstruction unit to record the detection point cloud density according to the set and the ultrasonic reflection signal set Record thickness range and , real-time recording of ultrasonic reflection signals at each detection location and its corresponding position signal , and generate detection point cloud signals in real time Until the transducer completes scanning of the multi-curved and thickened composite blade, the ultrasonic signal reconstruction unit generates Detection point cloud signals , , Indicated by ,…, constitute.

[0046] In some embodiments, the method of solving the corresponding acoustic stretch coefficient according to the ultrasonic reflection signal of each detection position point to obtain the reconstructed ultrasonic reflection 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, , It is the screen signal display height in the ultrasonic signal display unit; When the acoustic stretch coefficient is saved ,according to Solve the reconstructed ultrasonic reflection signal point cloud , , is the redundancy of ultrasonic signal; Constructing the reconstructed ultrasonic reflection signal point cloud Harmonic stretch coefficient point cloud , , .

[0047] In some embodiments, the method of reconstructing the ultrasonic reflection detection signal of the multi-curved thickened composite blade subsequently scanned and detected by using the acoustic stretch coefficient point cloud comprises: , realize the acoustic stretching of the ultrasonic reflection detection signal point cloud of the multi-bend thickened composite material blade that is subsequently scanned and detected, and obtain the reconstructed ultrasonic reflection signal point cloud of the multi-bend thickened composite material blade that is subsequently detected .

[0048] In some embodiments, after reconstructing the ultrasonic reflection detection signal of the multi-bend thickened composite blade subsequently scanned and detected using the acoustic stretch coefficient point cloud, the method further includes: reconstructing the ultrasonic reflection signal point cloud of the multi-bend thickened composite blade based on the reconstructed ultrasonic reflection signal point cloud. and its changes, and realize ultrasonic detection of multi-curved and thickened composite blades through signal indication and imaging display.

[0049] The principle and hardware structure of the ultrasonic reflection detection signal reconstruction method and device for multi-curved and thickened composite blades are as follows Figure 2 As shown, it mainly consists of a transducer 1, an ultrasonic transmitting / receiving unit 2, an ultrasonic signal reconstruction unit 3, an ultrasonic signal display unit 4, a scanning unit 5, etc. The test piece 6 represents an extremely complex multi-curved variable thickness composite blade, in which:

[0050] The transducer 1 is used to transmit ultrasonic signals to the test piece 6 , and is used to receive ultrasonic reflection signals from the test piece 6 , The ultrasonic reflection signals from different depths in the test piece 6 Composition, here, , is the total number of ultrasonic reflection signals from different depths in the test piece 6, is the location of transducer 1 The corresponding position coordinates of the detection position points are .

[0051] The ultrasonic transmitting / receiving unit 2 is used to provide the transmitting signal to the transducer 1 and to receive the ultrasonic reflected signal received by the transducer. The ultrasonic signal reconstruction unit 3 is used to reconstruct the ultrasonic reflected signal after the ultrasonic transmitting / receiving unit 2 preprocesses it. Reconstruct the ultrasonic reflection signal obtained by the transducer 1 during the three-dimensional (ie 3D) scanning of the test piece 6 using the CPU and data processing capabilities of the ultrasonic signal reconstruction unit 3. Map and associate with the position signal and generate the detection point cloud signal ,here, Respectively expressed as Each detection point corresponds to the position coordinate of the transducer 1 where the test piece 6 is located. For the corresponding At the same time, the ultrasonic signal reconstruction unit 3 is used to set the signal preprocessing threshold .

[0052] The ultrasonic signal display unit 4 is used to display the ultrasonic reflection signal reconstructed by the ultrasonic signal reconstruction unit 3. Perform signal display and / or imaging display, and set the signal preprocessing threshold for the ultrasound signal reconstruction unit 3 Provide signal indication, , The height of the screen signal displayed in the ultrasonic signal display unit 4. The scanning unit 5 is used to drive the transducer 1 to follow the given scanning trajectory and detect the point cloud density. Automatically scan the test piece 6 to automatically obtain the detection point cloud signal of each detection position point , see Figure 3 .

[0053] The automatic acquisition method of ultrasonic reflection detection point cloud is as follows: According to the characteristics of the inspected extremely complex multi-surface variable thickness composite blade and the inspection requirements, the scanning unit 5 generates the inspection point cloud scanning trajectory, see Figure 3 , and set the density of the detection point cloud through the scanning unit 5 Using the ultrasonic signal display unit 4 to display the ultrasonic signal position, the ultrasonic signal reconstruction unit 3 sets the ultrasonic reflection signal Record thickness range and The scanning unit 5 generates a detection point cloud scanning trajectory, and drives the transducer 1 to automatically scan the extremely complex multi-surface variable thickness composite material blade using the ultrasonic reflection method. At the same time, the ultrasonic signal reconstruction unit 3 reconstructs the detection point cloud density according to the set value. and the ultrasonic reflection signal set Record thickness range and , real-time recording of ultrasonic reflection signals at each detection location and its corresponding position signal , and generate detection point cloud signals in real time Until the transducer 1 completes scanning of the extremely complex multi-surface variable thickness composite blade, the ultrasonic signal reconstruction unit 3 automatically generates Detection point cloud signals , ,here, Indicated by ,…, The following " ” have the same meaning.

[0054] After the scan is completed, the ultrasonic signal reconstruction unit 3 follows the following steps: in Solving for the acoustic stretch coefficient :

[0055] Step 1: Signal Stretching: When hour, , is the minimum ultrasonic signal gain step, It is an integer and its initial value is 1. for Peak value;

[0056] Step 2: Determine the signal stretching effect: When the k The value of is increased by 1 based on the original value; until When saving ,here is the ultrasonic signal redundancy, which can be determined by experiments.

[0057] according to Solve the reconstructed ultrasonic reflection signal point cloud , ,use Constructing the reconstructed ultrasonic reflection signal point cloud Harmonic stretch coefficient point cloud :

[0058]

[0059]

[0060] The above formula is used to reconstruct the ultrasonic reflection detection signal of the abnormally complex multi-surface variable thickness composite blade that is subsequently scanned and detected: , to achieve the acoustic stretching of the ultrasonic reflection method detection signal point cloud of the abnormally complex multi-curved surface variable thickness composite material blade that was subsequently scanned and detected, and obtain the reconstructed ultrasonic reflection method detection signal of the abnormally complex multi-curved surface variable thickness composite material blade that was subsequently detected , obtain ultrasonic reflection method detection signals that better reflect the geometric characteristics and acoustic characteristics of the abnormally complex multi-curved surface variable thickness composite material blade being detected, so as to more accurately perform ultrasonic detection of abnormally complex multi-curved surface variable thickness composite material blades; based on and its changes, and realize ultrasonic detection of extremely complex multi-surface variable thickness composite blades through signal indication and imaging display.

[0061] An embodiment of the present application also provides an ultrasonic reflection detection signal reconstruction device for a multi-curved and thickened composite material blade. The ultrasonic reflection detection signal reconstruction device for a multi-curved and thickened composite material blade includes a transducer, an ultrasonic signal reconstruction unit, an ultrasonic signal display unit, and a scanning unit. The ultrasonic reflection detection signal reconstruction device for a multi-curved and thickened composite material blade is used to implement the ultrasonic reflection detection signal reconstruction method for a multi-curved and thickened composite material blade as described above.

[0062] In some embodiments, an ultrasonic transmitting / receiving unit is further included, and the ultrasonic transmitting / receiving unit is used to provide a transmitting signal to the transducer and to pre-process the ultrasonic reflection signal received by the transducer.

[0063] In some embodiments, the ultrasonic signal reconstruction unit is used to reconstruct the ultrasonic reflection signal preprocessed by the ultrasonic transmitting / receiving unit.

[0064] Based on the principle of ultrasonic reflection and the propagation behavior of sound waves in extremely complex multi-curved and variable thickness composite blades, the present application proposes a signal reconstruction method and device for ultrasonic reflection detection of multi-curved and variable thickness composite blades according to the curvature, thickness, surface and internal state, acoustic characteristics and detection requirements of each different detection position in the extremely complex multi-curved and variable thickness composite blades. The method and device can accurately reconstruct the ultrasonic reflection detection signal of the extremely complex multi-curved and variable thickness composite blades, taking into account the curvature, thickness, surface state, internal microstructure, acoustic characteristics and detection requirements of each detection position point of the extremely complex multi-curved and variable thickness composite blades, thereby improving the rationality and accuracy of the ultrasonic reflection detection signal reconstruction of the extremely complex multi-curved and variable thickness composite blades, and is more conducive to distinguishing defect signals from ultrasonic reflection detection signal changes caused by changes in the blade's own curvature, thickness and internal microstructure, thereby improving the ultrasonic detection effect and defect detection capability of the extremely complex multi-curved and variable thickness composite blades; it can take into account different composite blades and their requirements for ultrasonic defect detection, realize intelligent reconstruction of ultrasonic reflection detection signals, and significantly improve the efficiency of ultrasonic reflection detection signal reconstruction and detection efficiency as well as the accuracy of detection results.

[0065] It should be noted that the information interaction, execution process, etc. between the above-mentioned modules / units are based on the same concept as the method embodiment of this application. Their specific functions and technical effects can be found in the method embodiment section and will not be repeated here.

[0066] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one 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 software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0067] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for reconstructing ultrasonic reflection detection signals of multi-curved and thickened composite blades, characterized in that: include: The transducer is driven to perform ultrasonic reflection scanning on the multi-curved and thickened composite blade according to the set detection point cloud scanning trajectory and detection point cloud density; The ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals; Solve the corresponding acoustic stretch coefficient according to the ultrasonic reflection signal of each detection position point to obtain the reconstructed ultrasonic reflection signal point cloud and acoustic stretch coefficient point cloud; The acoustic stretch coefficient point cloud is used to reconstruct the ultrasonic reflection detection signal of the multi-curved and thickened composite blade that is subsequently scanned and inspected. The method of solving the corresponding acoustic stretch coefficient according to the ultrasonic reflection signal of each detection position point to obtain the reconstructed ultrasonic reflection signal point cloud and acoustic stretch coefficient point cloud includes: when hour, , is the minimum ultrasonic signal gain step, It is an integer and its initial value is 1. Ultrasonic reflection signal The peak value, The transducer is located Detection location points, , The height of the screen signal displayed in the ultrasonic signal display unit; when , continue to the previous step, k The value of is increased by 1 based on the original value until When the acoustic stretch coefficient is saved ,according to Solve the reconstructed ultrasonic reflection signal point cloud , , is the redundancy of ultrasonic signal; use Constructing the reconstructed ultrasonic reflection signal point cloud Harmonic stretch coefficient point cloud , , , m Indicates the number of detection location points, x , y , z They respectively represent the position coordinates of the test piece where the transducer is located corresponding to the test position point; Indicated by ,…, constitute; Indicated by ,…, constitute.

2. The method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade according to claim 1, characterized in that: Before the driving transducer performs ultrasonic reflection scanning on the multi-curved and thickened composite material blade according to the set detection point cloud scanning trajectory and detection point cloud density, the method further includes: According to the characteristics and inspection requirements of the multi-curved and thickened composite blade being inspected, the scanning unit generates the inspection point cloud scanning trajectory and sets the inspection point cloud density. .

3. The method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade according to claim 1, characterized in that: Before the ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate a plurality of detection point cloud signals, the method further includes: The ultrasonic signal position displayed by the ultrasonic signal display unit is used to set the ultrasonic reflection signal through the ultrasonic signal reconstruction unit. Record thickness range and .

4. The method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade according to claim 1, characterized in that: The ultrasonic signal reconstruction unit is used to record the ultrasonic reflection signal of each detection position point and its corresponding position signal to generate multiple detection point cloud signals, including: Use the ultrasonic signal reconstruction unit to detect the point cloud density according to the settings and the ultrasonic reflection signal set Record thickness range and , real-time recording of ultrasonic reflection signals at each detection location and its corresponding position signal , and generate detection point cloud signals in real time ; Until the transducer completes scanning of the multi-curved and thickened composite blade, the ultrasonic signal reconstruction unit generates Detection point cloud signals , , Indicated by ,…, constitute.

5. The method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade according to claim 1, characterized in that: The method of reconstructing the ultrasonic reflection detection signal of the multi-curved and thickened composite material blade subsequently scanned and detected by using the acoustic stretch coefficient point cloud includes: Based on acoustic stretch coefficient point cloud , realize the acoustic stretching of the ultrasonic reflection detection signal point cloud of the multi-bend thickened composite material blade that is subsequently scanned and detected, and obtain the reconstructed ultrasonic reflection signal point cloud of the multi-bend thickened composite material blade that is subsequently detected .

6. The method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite blade according to claim 1, characterized in that: After reconstructing the ultrasonic reflection method detection signal of the multi-curved and thickened composite material blade that is subsequently scanned and detected using the acoustic stretch coefficient point cloud, the method further includes: Ultrasonic reflection signal point cloud reconstructed based on multi-curved and thickened composite blade and its changes, and realize ultrasonic detection of multi-curved and thickened composite blades through signal indication and imaging display.

7. A device for reconstructing ultrasonic reflection detection signals of multi-curved and thickened composite blades, characterized in that: It includes a transducer, an ultrasonic signal reconstruction unit, an ultrasonic signal display unit, and a scanning unit; The device for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite material blade is used to implement the method for reconstructing ultrasonic reflection detection signals of a multi-curved and thickened composite material blade according to any one of claims 1 to 6.

8. The ultrasonic reflection detection signal reconstruction device for a multi-curved and thickened composite blade according to claim 7, characterized in that: It also includes an ultrasonic transmitting / receiving unit, which is used to provide a transmitting signal to the transducer and to pre-process the ultrasonic reflection signal received by the transducer.

9. The ultrasonic reflection detection signal reconstruction device for a multi-curved and thickened composite blade according to claim 8, characterized in that: The ultrasonic signal reconstruction unit is used to reconstruct the ultrasonic reflection signal preprocessed by the ultrasonic transmitting / receiving unit.

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