Method and device for testing stability of ultrasonic 3D scanning detection signal

Abstract

The invention relates to the technical field of composite material detection, in particular to an ultrasonic 3D scanning detection signal stability testing method and device, and the ultrasonic 3D scanning detection signal stability testing method comprises the steps: fixedly supporting a detected composite material blade between a receiving transducer and a transmitting transducer for ultrasonic 3D scanning; moving the receiving transducer and the transmitting transducer to a set detection position point according to a set ultrasonic 3D scanning track; acquiring a plurality of ultrasonic signals of each detection position point according to a set time difference, and determining statistical values of the plurality of ultrasonic signals, the statistical values including a mean value, a maximum value and a minimum value; and determining the stability coefficient of each detection position point according to the statistical value, and grading the stability of the ultrasonic signal according to the mean value of the stability coefficients of all the detection position points. According to the method, the problem that dynamic quantitative evaluation of ultrasonic 3D scanning imaging detection signals of the composite material workpiece in a real scene is difficult can be solved, and the ultrasonic 3D scanning detection accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of composite material detection, and particularly relates to a method and device for testing the stability of ultrasonic 3D scanning detection signals. Background Art

[0002] Composite material blades have been widely used in the manufacture of aero-engines and belong to key components. Usually, these composite material key components have very complex geometric shapes and internal ply structures. Due to quality and safety reasons, ultrasonic automatic scanning detection needs to be performed on them.

[0003] During the ultrasonic automatic scanning detection process, water coupling and complex ultrasonic automatic scanning equipment are required to obtain the detection signals during the automatic scanning of the composite material blade. Generally, the signals from ultrasonic automatic scanning detection are in the mv magnitude and are particularly susceptible to the effects of water coupling, environmental electrical interference, and the alignment accuracy between the probe and the composite material blade being detected during the scanning process. The larger and more complex the composite material blade being detected, the harsher the electrical environment of the ultrasonic equipment, and the worse the water coupling effect, the more serious the impact on the detection signal, and even the correct ultrasonic automatic scanning detection result cannot be obtained. During the ultrasonic 3D scanning of composite material blades, these effects are more prominent.

[0004] Currently, in some ultrasonic 3D scanning equipment and detection practices, one method is to use homogeneous materials, such as plexiglass plates, to evaluate the stability of ultrasonic signals. There is no comprehensive evaluation method and quantitative grading model for the stability of detection signals in the ultrasonic 3D scanning scenario of actual composite material blades to be detected, which has also been affecting the ultrasonic 3D automatic scanning detection effect and the accuracy of detection results of composite material blades. Summary of the Invention

[0005] The present application provides a method and device for testing the stability of ultrasonic 3D scanning detection signals to solve the problems in the above background art.

[0006] In a first aspect, the present application provides a method for testing the stability of ultrasonic 3D scanning detection signals, including: Fixing the composite material blade to be detected between a receiving transducer and a transmitting transducer for ultrasonic 3D scanning; Moving the receiving transducer and the transmitting transducer to a set detection position point according to a set ultrasonic 3D scanning trajectory; Obtaining multiple ultrasonic signals at each detection position point according to a set time difference and determining the statistical values of the multiple ultrasonic signals, where the statistical values include the mean value, the maximum value, and the minimum value; Determining the stability coefficient at each detection position point according to the statistical values and grading the stability of the ultrasonic signals according to the mean value of the stability coefficients of all detection position points.

[0007] Further, before moving the receiving transducer and the transmitting transducer to the set detection position points according to the set ultrasonic 3D scanning trajectory, the following steps are also included: Generating an ultrasonic 3D scanning trajectory using a scanning unit and , being the step between two adjacent ultrasonic 3D scanning trajectories and . Determining the number of detection position points , .

[0008] Further, before obtaining multiple ultrasonic signals at each detection position point according to the set time difference, the following steps are also included: Determining the ultrasonic signals of the receiving transducer and the ultrasonic signals of the transmitting transducer according to the set ultrasonic display reference value , .

[0009] Further, the time difference , represents the distance between two adjacent detection position points, is the ultrasonic 3D scanning speed of the transmitting transducer and the receiving transducer, is the acquisition coefficient.

[0010] Further, determining the statistical value of multiple ultrasonic signals includes: Calculating the mean value , minimum value , and maximum value of the ultrasonic signals corresponding to each detection position point.

[0011] Further, determining the stability coefficient of each detection position point according to the statistical value includes: Calculating the number of the ultrasonic signals that satisfy the formula among the ultrasonic signals ; Calculating the stability coefficient of the ultrasonic signals and or at each detection position point according to the formula .

[0012] Further, grading the stability of the ultrasonic signal according to the mean value of the stability coefficients of all detected position points includes: If the mean value of the stability coefficients is greater than or equal to the first set value, it is rated as grade A, indicating that the ultrasonic signal is very stable; If the mean value of the stability coefficients is greater than or equal to the second set value and less than the first set value, it is rated as grade B, indicating that the ultrasonic signal is stable; If the mean value of the stability coefficients is greater than or equal to the third set value and less than the second set value, it is rated as grade C, indicating that the ultrasonic signal is relatively stable; If the mean value of the stability coefficients is greater than or equal to the fourth set value and less than the third set value, it is rated as grade D, indicating that the ultrasonic signal is basically stable; If the mean value of the stability coefficients is less than the fourth set value, it is rated as grade E, indicating that the ultrasonic signal is unstable.

[0013] In a second aspect, the present application provides an ultrasonic 3D scanning detection signal stability test device for implementing the ultrasonic 3D scanning detection signal stability test method as described above; the ultrasonic 3D scanning detection signal stability test device includes a receiving transducer, a transmitting transducer, and a scanning unit; The receiving transducer is used to receive the transmitted signal from the composite material blade to be detected , and the transmitting transducer is used to transmit an ultrasonic signal to the composite material blade to be detected , and is also used to receive the ultrasonic reflection signal from the composite material blade to be detected ; The scanning unit is used to generate an ultrasonic 3D scanning trajectory of the composite material blade to be detected , and drive the receiving transducer and the transmitting transducer to perform ultrasonic 3D scanning on the composite material blade to be detected according to the generated scanning trajectory.

[0014] Further, it further includes an ultrasonic unit, an imaging unit, and a water coupling unit; The ultrasonic unit is used to provide a received signal to the receiving transducer and preprocessing and digital transformation, and provide a transmitted signal to the transmitting transducer and preprocessing and digital transformation; The imaging unit is used to construct the mapping relationship between the detected position points and the ultrasonic reflection signal and the ultrasonic transmission signal , and generate an ultrasonic reflection detection signal point cloud and an ultrasonic transmission detection signal point cloud , and based on and perform the recording and imaging display of the ultrasonic detection results; The water coupling unit is used to provide water spraying coupling for the receiving transducer and the transmitting transducer.

[0015] Furthermore, the scanning unit is also used to provide the imaging unit with the position signals of the receiving transducer and the transmitting transducer.

[0016] The above technical solution of the present application has the following advantages: The ultrasonic 3D scanning detection signal stability test method provided in the first aspect of the present application performs ultrasonic 3D scanning by fixing the composite material blade to be detected between the receiving transducer and the transmitting transducer, moves the receiving transducer and the transmitting transducer to the set detection position points according to the set ultrasonic 3D scanning trajectory, obtains multiple ultrasonic signals at each detection position point according to the set time difference, and determines the statistical values of the multiple ultrasonic signals. The statistical values include the mean value, the maximum value, and the minimum value. Determine the stability coefficient of each detection position point according to the statistical value, and classify the ultrasonic signal stability according to the mean value of the stability coefficients of all detection position points, which can solve the problem of difficult dynamic quantitative evaluation of ultrasonic 3D scanning imaging detection signals for composite material parts in real scenarios and improve the accuracy of ultrasonic 3D scanning detection.

[0017] It can be understood that the beneficial effects of the above second aspect can be referred to the relevant descriptions in the above first aspect and will not be elaborated here. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the ultrasonic 3D scanning detection signal stability test device provided by the present application.

[0020] Reference numerals: 1, receiving transducer; 2, transmitting transducer; 3, ultrasonic unit; 4, imaging unit; 5, scanning unit; 6, water coupling unit; 7, composite material blade to be detected. Specific Embodiments

[0021] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as 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.

[0022] It should be understood that when used in the specification and appended claims of the present application, 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.

[0023] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0024] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that a specific feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, statements such as "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".

[0025] The purpose of the present application is to address the requirements for the stability of detection signals in the ultrasonic 3D scanning detection of composite material blades and the existing deficiencies, and to propose a method and device for testing the stability of ultrasonic 3D scanning detection signals, providing a method for quantitatively testing and evaluating the stability of detection signals and a grading model for improving the ultrasonic 3D scanning detection effect of composite material blades, for improving the accuracy of ultrasonic 3D scanning detection of composite material blades and the reliability of detection results, reducing the risk of missed detection and misjudgment, and improving the comprehensive optimization efficiency of the ultrasonic 3D scanning detection system.

[0026] The following further describes in detail the specific implementation manners of the present application in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present application but not to limit the scope of the present application.

[0027] An embodiment of the present application provides a method for testing the stability of ultrasonic 3D scanning detection signals, which specifically includes the following steps: Fix the composite material blade to be detected between a receiving transducer and a transmitting transducer for ultrasonic 3D scanning; Move the receiving transducer and the transmitting transducer to a set detection position point according to the set ultrasonic 3D scanning trajectory; Obtain multiple ultrasonic signals at each detection position point according to the set time difference, and determine the statistical values of the multiple ultrasonic signals, where the statistical values include the mean value, the maximum value, and the minimum value; Determine the stability coefficient of each detection position point according to the statistical value, and classify the stability of the ultrasonic signals according to the mean value of the stability coefficients of all detection position points.

[0028] During the ultrasonic 3D scanning of composite material parts, currently, some use homogeneous material plates, such as plexiglass plates, to evaluate the stability of ultrasonic signals. The main deficiencies are as follows: 1) The geometric and positional characteristics of the homogeneous material plate are completely different from those of the actual composite material part to be detected, and the results obtained are difficult to represent the characteristics and stability of the ultrasonic 3D scanning detection signals of the actual composite material part; 2) The relative position between the homogeneous material plate and the ultrasonic 3D scanning probe part is fixed, and it is difficult to reflect the actual scenario during the ultrasonic 3D scanning of the actual composite material part and the influence caused by the geometric and positional deviation between the probe and the composite material part to be detected; 3) The water distance between the homogeneous material plate and the probe is fixed, and it is difficult to reflect the influence of the water coupling change and deviation during the ultrasonic 3D scanning of the actual composite material part on the detection signals; 4) There is a lack of a detection signal stability evaluation method and a quantitative grading model based on the actual detection environment and detection parts of the ultrasonic 3D scanning equipment, which is not conducive to improving the detection effect of ultrasonic 3D scanning of composite material parts.

[0029] In view of these deficiencies, the present application combines the complex composite material blade and the actual environment of the ultrasonic 3D scanning detection equipment. For the ultrasonic 3D scanning detection signals of composite material blades with complex geometric shapes, which are more susceptible to comprehensive interference effects such as electromagnetic, water coupling, and geometric and positional deviation, and lack an effective method for quantitatively evaluating the stability of detection signals and a quantitative grading model, based on the evaluation principle considering the integration of multiple factors, a method for testing the stability of ultrasonic 3D scanning detection signals is proposed, which solves the problem of the difficult dynamic quantitative evaluation of ultrasonic 3D scanning imaging detection signals of composite material parts in the actual scenario. Thus, a quantitative detection and evaluation method and a grading model are provided for improving the ultrasonic 3D scanning detection effect of composite material blades, significantly improving the accuracy of ultrasonic 3D scanning detection and the actual detection effect.

[0030] In some embodiments, before moving the receiving transducer and the transmitting transducer to the set detection position point according to the set ultrasonic 3D scanning trajectory, it further includes: Generating an ultrasonic 3D scanning trajectory using a scanning unit and , are two adjacent ultrasonic 3D scanning trajectories and Stepping; determining the number of detection position points , .

[0031] In some embodiments, before obtaining multiple ultrasonic signals of each detection position point according to the set time difference, it further includes: according to the set ultrasonic display reference value Determining the ultrasonic signals of the receiving transducer and the ultrasonic signals of the transmitting transducer , .

[0032] In some embodiments, the time difference , represents the distance between two adjacent detection position points, is the ultrasonic 3D scanning speed of the transmitting transducer and the receiving transducer, is the acquisition coefficient.

[0033] In some embodiments, determining the statistical value of the multiple ultrasonic signals includes: calculating the mean value corresponding to each detection position point and / or of the ultrasonic signals , the minimum value , the maximum value .

[0034] In some embodiments, determining the stability coefficient of each detection position point according to the statistical value includes: calculating the number of ultrasonic signals and / or that satisfy the formula , , ; calculating the stability coefficient of the ultrasonic signals of each detection position point and / or according to the formula .

[0035] In some embodiments, grading the stability of the ultrasonic signals according to the mean value of the stability coefficients of all detection position points includes: if the mean value of the stability coefficients is greater than or equal to the first set value, it is rated as grade A, indicating that the ultrasonic signals are very stable; if the mean value of the stability coefficients is greater than or equal to the second set value and less than the first set value, it is rated as grade B, indicating that the ultrasonic signals are stable; if the mean value of the stability coefficients Greater than or equal to the third set value and less than the second set value, it is rated as grade C, indicating that the ultrasonic signal is relatively stable; if the mean value of the stability coefficient Greater than or equal to the fourth set value and less than the third set value, it is rated as grade D, indicating that the ultrasonic signal is basically stable; if the mean value of the stability coefficient Less than the fourth set value, it is rated as grade E, indicating that the ultrasonic signal is unstable.

[0036] The embodiment of the present application also provides an ultrasonic 3D scanning detection signal stability test device for implementing the ultrasonic 3D scanning detection signal stability test method as described above; the ultrasonic 3D scanning detection signal stability test device includes a receiving transducer, a transmitting transducer and a scanning unit; the receiving transducer is used to receive the transmission signal from the composite material blade to be detected , and the transmitting transducer is used to transmit ultrasonic signals to the composite material blade to be detected , and is also used to receive the ultrasonic reflection signals from the composite material blade to be detected ; the scanning unit is used to generate an ultrasonic 3D scanning trajectory of the composite material blade to be detected , and drive the receiving transducer and the transmitting transducer to perform ultrasonic 3D scanning on the composite material blade to be detected according to the generated scanning trajectory.

[0037] In some embodiments, it further includes an ultrasonic unit, an imaging unit and a water coupling unit; the ultrasonic unit is used to provide receiving signals for the receiving transducer and preprocessing and digital transformation, and provide transmission signals for the transmitting transducer and preprocessing and digital transformation; the imaging unit is used to construct the mapping relationship between the detection position points and the ultrasonic reflection signals and the ultrasonic transmission signals , and generate an ultrasonic reflection detection signal point cloud and an ultrasonic transmission detection signal point cloud , and record and image-display the ultrasonic detection results based on and ; the water coupling unit is used to provide water spraying coupling for the receiving transducer and the transmitting transducer.

[0038] In some embodiments, the scanning unit is further used to provide position signals of the receiving transducer and the transmitting transducer for the imaging unit.

[0039] The hardware composition for implementing the ultrasonic 3D scanning detection signal stability test method is as Figure 1As shown in the figure, it mainly consists of a receiving transducer 1, a transmitting transducer 2, an ultrasonic unit 3, an imaging unit 4, a scanning unit 5, a water coupling unit 6, etc. The composite material blade 7 to be detected is fixedly supported on a special detection fixture. The water coupling unit 6 provides water jet coupling to the receiving transducer 1 and the transmitting transducer 2 through a water path 1A and a water path 2A respectively. The receiving transducer 1 is used to receive the transmitted signal from the composite material blade 7 to be detected , the superscript represents ultrasonic transmission. The transmitting transducer 2 is used to transmit ultrasonic signals to the composite material blade 7 to be detected , and is also used to receive the ultrasonic reflection signals from the composite material blade 7 to be detected , represents the th detection position point where the transmitting transducer 2 is located , the superscript represents ultrasonic reflection. The ultrasonic unit 3 is used to provide received signals and preprocessing and digital transformation to the receiving transducer 1, and to provide transmitted signals and preprocessing and digital transformation to the transmitting transducer 2

[0040] The scanning unit 5 consists of a double six-axis scanning mechanism. Under the action of its control unit, it is used to drive the receiving transducer 1 and the transmitting transducer 2 to perform ultrasonic 3D scanning on the composite material blade 7 to be detected according to a given scanning trajectory. The scanning unit 5 is also used to generate the ultrasonic 3D scanning trajectory of the composite material blade 7 to be detected , to realize the ultrasonic 3D scanning of the receiving transducer 1 and the transmitting transducer 2, and to provide the position signals of the receiving transducer 1 and the transmitting transducer 2 to the imaging unit 4. The imaging unit 4 is used to construct the mapping relationship between the detection position points and the ultrasonic reflection signals and the ultrasonic transmission signals , and to generate the ultrasonic reflection detection signal point cloud and the ultrasonic transmission detection signal point cloud , and to record, image and display the ultrasonic detection results based on and . Using the Figure 1 hardware, water immersion coupling can also be used, and the ultrasonic reflection mode, transmission mode and multi-mode ultrasonic 3D scanning detection method can be selected according to the actual detection requirements

[0041] The method and steps for testing and evaluating the stability of ultrasonic 3D scanning detection signals are as follows 1) Method for selecting detection point position signals Based on the ultrasonic 3D scanning trajectory generated by the scanning unit 5 and , For two adjacent ultrasonic 3D scanning trajectories and step, move the receiving transducer 1 and the transmitting transducer 2 to the th detection position point , where , the number of detection position points, are respectively the coordinates of the detection position point , are respectively the attitude coordinates of the detection position point . It is determined according to the geometric characteristics of the composite material blade 7 to be detected, and determined according to formula (1) : (1) Here, the magnification coefficient , is determined by detection tests according to the geometric characteristics and ply characteristics of the composite material blade 7 to be detected.

[0042] 2) Set ultrasonic parameters Through the ultrasonic unit 3, set the ultrasonic parameters according to formula (2) so that the ultrasonic signal from the receiving transducer 1 and the ultrasonic signal of the transmitting transducer 2 meet the requirements of formula (2): (2) Here, is the ultrasonic display reference value, which is determined according to the detection requirements.

[0043] 3) Obtain ultrasonic evaluation signals Using the device with the function of ultrasonic 3D scanning detection of composite material parts shown in Figure 1 , according to the determined ultrasonic 3D scanning trajectory and , successively move the receiving transducer 1 and the transmitting transducer 2 to the corresponding detection position points , and obtain the corresponding for each detection position point according to the number of ultrasonic signals and / or , where in the case of reflection method ultrasonic 3D scanning detection, obtain , in the case of transmission method ultrasonic 3D scanning detection, obtain , and in the case of multimode ultrasonic 3D scanning detection, obtain both and .

[0044] (3) Here, represents the distance between two adjacent detection position points, is the ultrasonic 3D scanning speed of the transmitting transducer 2 and / or the receiving transducer 1, is the acquisition coefficient.

[0045] 4) Calculate for each detection position point the corresponding ultrasonic signals and / or the mean value , minimum value , maximum value .

[0046] Calculate according to Equation (4) for each detection position point the corresponding ultrasonic signals and / or to obtain the number of ultrasonic signals and / or that satisfy Equation (4) .

[0047] (4) The current signal fluctuation bandwidth or take , is the threshold signal fluctuation bandwidth, which is determined according to the detection requirements.

[0048] Calculate the stability coefficient of the ultrasonic signals for each detection position point and / or according to Equation (5) .

[0049] (5) A total of stability coefficients are obtained: , calculate the mean value for , minimum value , maximum value .

[0050] 5) Ultrasonic signal stability discrimination and grading method , rated as grade A, indicating that the ultrasonic signal is very stable; , rated as grade B, indicating that the ultrasonic signal is stable; , rated as grade C, indicating that the ultrasonic signal is relatively stable; , it is rated as D level, indicating that the ultrasonic signal is basically stable; , it is rated as E level, indicating that the ultrasonic signal is unstable.

[0051] When the stability evaluation of the ultrasonic signal is D level and E level, it is necessary to comprehensively optimize the ultrasonic 3D scanning detection environment, including electromagnetic interference, water coupling, geometric deviation, ultrasonic electronic unit, equipment wiring rationality, etc.

[0052] In view of the fact that the ultrasonic 3D scanning detection signal of composite parts is affected by comprehensive interferences such as electromagnetic, water coupling, and geometric deviation, and there is a lack of effective quantitative evaluation methods and grading models for testing and evaluating the stability of the detection signal. Based on the evaluation principle considering the integration of multiple factors, this application proposes a method for testing the stability of ultrasonic 3D scanning detection signals, which solves the problem that it is difficult to dynamically quantitatively evaluate the stability of ultrasonic 3D scanning imaging detection signals in real scenarios. Thus, it provides a testing and quantitative evaluation method and grading model for the stability of ultrasonic signals, provides an evaluation method for improving the ultrasonic 3D scanning detection effect of composite parts, and is very helpful for improving the accuracy and defect detection ability of ultrasonic 3D scanning detection results, and guiding the comprehensive design of ultrasonic 3D detection equipment for composite parts and the comprehensive optimization of electromagnetic, water coupling, geometric deviation, etc.

[0053] 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 can be specifically referred to the method embodiment part, and will not be elaborated here.

[0054] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual 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 in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in 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 process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiment and will not be elaborated here.

[0055] The embodiments described above 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 recorded 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 embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An ultrasonic 3D scanning detection signal stability testing method, characterized in that, Comprising: Fix the composite material blade to be detected between the receiving transducer and the transmitting transducer for ultrasonic 3D scanning; Move the receiving transducer and the transmitting transducer to the set detection position points according to the set ultrasonic 3D scanning trajectory; Obtain multiple ultrasonic signals at each detection position point according to the set time difference, and determine the statistical values of the multiple ultrasonic signals, where the statistical values include the mean value, the maximum value, and the minimum value; Determine the stability coefficient of each detection position point according to the statistical values, and classify the stability of the ultrasonic signals according to the mean value of the stability coefficients of all detection position points.

2. The ultrasonic 3D scanning detection signal stability testing method according to claim 1, characterized in that, Before moving the receiving transducer and the transmitting transducer to the set detection position points according to the set ultrasonic 3D scanning trajectory, it further includes: Generating an ultrasonic 3D scanning trajectory using a scanning unit and , is the step between two adjacent ultrasonic 3D scanning trajectories and . Determine the number of detection position points , .

3. The ultrasonic 3D scanning detection signal stability testing method according to claim 2, characterized in that, Before obtaining multiple ultrasonic signals at each detection position point according to the set time difference, it further includes: According to the set ultrasonic display reference value Determine the ultrasonic signal of the receiving transducer and the ultrasonic signal of the transmitting transducer , .

4. The ultrasonic 3D scanning detection signal stability testing method according to claim 3, characterized in that, The time difference , represents the distance between two adjacent detection position points, is the ultrasonic 3D scanning speed of the transmitting transducer and the receiving transducer, is the acquisition coefficient.

5. The ultrasonic 3D scanning detection signal stability testing method according to claim 4, characterized in that, The determination of the statistical values of the multiple ultrasonic signals includes: Find each detection position point corresponding ultrasonic signals and / or mean value minimum value maximum value .

6. The ultrasonic 3D scanning detection signal stability testing method according to claim 5, characterized in that, The determination of the stability coefficient of each detection position point according to the statistical values includes: Find out ultrasonic signals and / or that satisfy the formula number , ; According to the formula calculate the ultrasonic signal at each detection position point and / or the stability coefficient .

7. The ultrasonic 3D scanning detection signal stability testing method according to claim 6, characterized in that, The classification of the stability of the ultrasonic signals according to the mean value of the stability coefficients of all detection position points includes: If the mean value of the stability coefficient is greater than or equal to the first set value, it is rated as Class A, indicating that the ultrasonic signal is very stable; If the mean value of the stability coefficient is greater than or equal to the second set value and less than the first set value, it is rated as Class B, indicating that the ultrasonic signal is stable; If the mean value of the stability coefficient is greater than or equal to the third set value and less than the second set value, it is rated as Class C, indicating that the ultrasonic signal is relatively stable; If the mean value of the stability coefficient is greater than or equal to the fourth set value and less than the third set value, it is rated as grade D, indicating that the ultrasonic signal is basically stable; If the mean stability coefficient is less than the fourth set value, it is rated as level E, indicating that the ultrasonic signal is unstable.

8. An ultrasonic 3D scanning detection signal stability testing device, characterized in that, Used to implement the ultrasonic 3D scanning detection signal stability test method according to any one of claims 1 to 7; the ultrasonic 3D scanning detection signal stability test device includes a receiving transducer, a transmitting transducer, and a scanning unit; The receiving transducer is used to receive the transmitted signal from the composite material blade to be detected , and the transmitting transducer is used to transmit an ultrasonic signal to the composite material blade to be detected , and is also used to receive the ultrasonic reflection signal from the composite material blade to be detected ; The scanning unit is used to generate an ultrasonic 3D scanning trajectory of the composite material blade to be detected , and drive the receiving transducer and the transmitting transducer to perform ultrasonic 3D scanning on the composite material blade to be detected according to the generated scanning trajectory.

9. The ultrasonic 3D scanning detection signal stability testing device according to claim 8, characterized in that, It further includes an ultrasonic unit, an imaging unit, and a water coupling unit; The ultrasonic unit is used to provide a reception signal to the receiving transducer and perform preprocessing and digital conversion, and to provide a transmission signal to the transmitting transducer and perform preprocessing and digital conversion; The imaging unit is used to construct the detection position points and the ultrasonic reflection signals and the ultrasonic transmission signals to establish the mapping relationship therebetween, and generate the ultrasonic reflection detection signal point cloud and the ultrasonic transmission detection signal point cloud , and record and image-display the ultrasonic detection results based on and ; The water coupling unit is used to provide water spraying coupling for the receiving transducer and the transmitting transducer.

10. The ultrasonic 3D scanning detection signal stability test device according to claim 9, wherein The scanning unit is further used to provide the position signals of the receiving transducer and the transmitting transducer for the imaging unit.

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