140 results about "Ultrasonic ndt" patented technology

The invention provides a storage battery health state assessment method fusing ultrasonic data and hybrid machine learning, and belongs to the technical field of storage battery health state assessment. The method focuses on performance comparison of an ANN model and a GWO-ANN model in storage battery SOH regression prediction, and finds that the GWO-ANN model accurately adjusts and optimizes ANN parameters by means of a grey wolf optimization algorithm, so that the storage battery health state assessment accuracy is improved. Compared with the prior art, the method has the advantages that higher prediction precision and generalization ability are shown, the R2 value is close to perfect, the error is extremely low, and the ANN model is remarkably surpassed, the HHT-GWO-ANN model is innovatively introduced, the model integrates the advantages of HHT and GWO, the calculation process is accelerated, the robustness and prediction precision of the model are enhanced, efficient and stable model construction is achieved, and the method is suitable for large-scale popularization and application. And the test performance of the method is consistent with that of the training stage, so that the practical potential of the method in storage battery SOH nondestructive testing is verified. The ultrasonic nondestructive testing method proposed by the invention shows unique advantages in SOH recognition of the storage battery, and overcomes the limitation of a traditional method.

The invention relates to the technical field of ultrasonic non-destructive testing, and discloses an intelligent ultrasonic non-destructive testing device which comprises a body mechanism, the body mechanism comprises an operation table, a displayer, an ultrasonic testing instrument and a mounting frame are fixedly mounted on the upper surface of the operation table, and an electric sliding rail is fixedly mounted on the inner top wall of the mounting frame; a mechanical arm is fixedly installed on the bottom face of the electric sliding rail, a probe is fixedly installed on the bottom face of the mechanical arm, and a processing mechanism is arranged above the operation table. The processing mechanism comprises a smearing unit, and the smearing unit is located below the mechanical arm and used for evenly smearing the coupling agent on the to-be-detected object according to the detection speed. According to the intelligent ultrasonic nondestructive testing device, the output efficiency of a coupling agent is automatically adjusted according to the detection rate, so that the output coupling agent is uniformly smeared on the surface of an object to be detected, the phenomenon of poor coupling between a probe and the object to be detected is avoided, and the supply efficiency of the coupling agent is improved.

The invention aims to provide an ultrasonic transducer capable of continuously and stably working in a high-temperature and high-pressure extreme environment, and belongs to the technical field of ultrasonic nondestructive testing, the ultrasonic transducer comprises a packaging matching layer, a piezoelectric layer, an electrode layer and a backing layer, the packaging matching layer can have the effects of high temperature resistance, high pressure resistance and heat dissipation so as to match acoustic impedance, and the piezoelectric layer is arranged on the backing layer. Therefore, the acoustic performance of the transducer is improved. The piezoelectric layer can keep excellent piezoelectric performance in a high-temperature environment. The electrode layer and the back lining layer can achieve a good heat dissipation effect, and the service life is prolonged. The method has a wide application prospect in the field of ultrasonic nondestructive testing in an extreme environment.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

According to the ultrasonic non-destructive testing device for the aviation composite material part, a tester can laterally lock the side edge of a sample through the positioning mechanism so as to meet the requirement for detecting a special-shaped or thicker sample, and meanwhile, the bottom of the sample can be locked in a negative pressure adsorption mode by reversely driving the positioning mechanism so as to meet the requirement for detecting the special-shaped or thicker sample. According to the sample table for the ultrasonic scanning microscope, the requirement that the sample is flat or is prone to being damaged due to extrusion is met, and after locking is completed, the detection face of the sample is in an unshielded state, so that the ultrasonic scanning microscope can comprehensively detect the sample, and the problems that an existing sample table for the ultrasonic scanning microscope shields the sample, and ultrasonic nondestructive testing errors of the sample are increased are effectively solved.

The invention relates to a manufacturing method of a high-heat-dissipation circuit board. The manufacturing method comprises the following steps of manufacturing a first multi-layer board and a second multi-layer board; anti-etching photosensitive dry films are attached to the single faces of the first multilayer board and the second multilayer board; etching the exposed copper foil layers of the first multilayer board and the second multilayer board; semi-grooves are machined in the exposed film layers of the first multilayer board and the second multilayer board; the capillary copper pipe is subjected to blocking and browning treatment, and semi-cured resin coating is carried out; the first multi-layer plate and the second multi-layer plate are stacked, and the capillary copper pipe is horizontally arranged in the containing groove; riveting the first multi-layer plate and the second multi-layer plate which are pre-embedded with the capillary copper pipes by using a rivet through electromagnetic hot melting; laminating the riveted first and second multi-layer boards, the outer layer prepreg and the outer copper foil layer by using a vacuum laminating machine to form a semi-finished board; performing ultrasonic nondestructive testing on the semi-finished plate; and post-processing the semi-finished board to obtain the circuit board. According to the manufacturing method, the circuit board with the horizontally-embedded capillary copper pipe is obtained through the processes of film drying, single-face etching, groove milling and the like, and the heat dissipating capacity is increased.

The invention relates to a nondestructive testing ultrasonic imaging method based on a spatial frequency spectrum coherence coefficient and a coherence energy coefficient, and belongs to the technical field of ultrasonic nondestructive testing. The technical problem that high resolution and high contrast cannot be both considered in a traditional delay superposition algorithm is solved. According to the technical scheme, the method comprises the steps of preprocessing ultrasonic echo signals; extracting a spatial spectrum coherence coefficient through discrete Fourier transform; fusing symbol coherence and energy distribution characteristics to generate a coherent energy coefficient; weighting a delay superposition result by using double coefficients; and outputting an optimized scanning line signal through adaptive FIR band-pass filtering. The method has the technical effects that the traditional balancing bottleneck of imaging resolution and contrast is broken through, interference artifacts in a metal homogeneous medium are remarkably inhibited, the micro-defect identification capability is enhanced, and the method is adaptive to diversified industrial detection scenes.

The invention discloses an uncalibrated stress measurement method and device based on ultrasonic longitudinal wave and incremental deformation mechanics, and relates to the technical field of ultrasonic nondestructive testing, and the method comprises the steps: obtaining an ultrasonic longitudinal wave time domain signal at a detection point of a to-be-detected test piece and the thickness of the to-be-detected test piece; determining the propagation time of the longitudinal wave in the test piece to be detected based on the ultrasonic longitudinal wave time domain signal; based on the thickness of the to-be-detected test piece and the propagation time, determining the propagation speed of the ultrasonic longitudinal wave in the to-be-detected test piece; and determining a stress value at the detection point of the test piece to be detected according to the propagation velocity. According to the invention, the problem of measuring the high-order elastic constant of the material can be avoided, and the dependence of a stress measurement result on a calibration result is avoided.

The invention discloses a composite material ultrasonic nondestructive testing array device and a testing method.The composite material ultrasonic nondestructive testing array device comprises a scanning matrix structure, a mechanical arm and a control unit, and the scanning matrix structure comprises a flaw detection frame, a plurality of transverse driving mechanisms, a plurality of longitudinal driving mechanisms, a laser scanner and a plurality of ultrasonic probes; the laser scanner and the plurality of ultrasonic probes are mounted on the flaw detection frame, and the laser scanner is used for acquiring a three-dimensional model of the to-be-detected composite material component. The mechanical arm is used for flexibly positioning the carried scanning matrix structure, so that the scanning matrix structure can quickly reach different detection areas of the large composite material component; a laser scanner and a plurality of ultrasonic probes are integrated in the scanning matrix structure, firstly, the laser scanner obtains the local three-dimensional shape of a component, the control unit plans a scanning path in real time according to the model and divides detection sub-areas, and then the multiple ultrasonic probes are driven to independently move in the frame at the same time; and performing synchronous parallel scanning on the respective distribution areas.

This invention discloses a wiring structure for an electromagnetic ultrasonic transducer and its application, belonging to the field of ultrasonic nondestructive testing technology. The wiring structure includes independent transmitting-side and receiving-side switch groups, allowing independent switching of the coil's topology connection during transmission and reception. Combined with a novel coil group structure design, it achieves both high-efficiency excitation and high-sensitivity reception. This invention integrates the above wiring structure into the transducer and constructs a semi-closed peripheral magnetic circuit to enhance the signal and meet the excitation energy and reception sensitivity requirements of different test pieces. This invention solves the problems of existing transducers, such as topology binding, poor adaptability, and weak detection signals. It can flexibly adapt to different testing scenarios, improve the detection signal strength and signal-to-noise ratio, and has a wide range of applications.

The utility model discloses a metal ultrasonic non-destructive testing device, which relates to the technical field of ultrasonic non-destructive testing and comprises a testing table, a side support is fixedly mounted on one side of the top of the testing table, an electric telescopic rod is fixedly mounted on the top of the side support, and sleeves are fixedly mounted at the output end of the electric telescopic rod and the top of the testing table. The metal ultrasonic detection device has the beneficial effects that the other metal ultrasonic detection probe is pushed to be in precise contact with the upper surface of a plate after the electric telescopic rod is started, and finally the sliding block can be driven to transversely reciprocate through threads by starting the servo motor to drive the reciprocating screw rod to rotate; the width of one probe on the transverse surface of the plate can be detected during movement, the rail motor can drive the detection plate to longitudinally move by the distance of the width of the metal ultrasonic detection probe to enable the undetected surface of the plate to move to the detection end of the metal ultrasonic detection probe, so that the plate can be comprehensively and automatically detected, the detection is convenient and rapid, and the detection efficiency is improved. And the detection efficiency is higher.

The invention belongs to the field of nondestructive testing, and relates to an all-optical non-contact ultrasonic nondestructive testing device, which utilizes a laser ultrasonic technology to excite a material to generate an ultrasonic signal, and is combined with a displacement table and a high-sensitivity optical microphone to realize detection and imaging of defects of a composite material plate. The whole system has the comprehensive advantages of no contact, no damage, high sensitivity, rapid signal response, strong environmental adaptability and the like, and can be widely applied to high-quality nondestructive detection requirements of various materials such as metal and nonmetal in the production, manufacturing, use and maintenance processes.

The invention discloses an ultrasonic nondestructive testing system and method for defects of a flip-chip. The ultrasonic nondestructive testing system comprises an upper computer, a pulse transceiver, an acquisition card, an ultrasonic sensor, a displacement platform, a three-dimensional motion platform and a motion controller, the upper computer serves as a control platform and is responsible for control instruction issuing and data processing. The pulse transceiver, the acquisition card and the high-frequency ultrasonic sensor form a signal acquisition and transmission platform which is responsible for transmitting, receiving, transmitting and analog-to-digital conversion of ultrasonic signals; the displacement platform is used for fixing the flip-chip bonding chip; the three-dimensional motion platform and the motion controller form a three-dimensional motion control system, and the three-dimensional motion control system is responsible for carrying an ultrasonic sensor to execute scanning at different spatial positions. The chip is integrally detected, welding spots do not need to be detected one by one, and the defect detection efficiency can be greatly improved.

The application discloses a finite element simulation calculation method of Rayleigh wave acoustic-elastic effect in a prestressed semi-infinite medium, which can realize prestressed Rayleigh wave simulation in an arbitrary waveguide section, has the advantages of fast simulation speed, and the simulation object can be arbitrarily extended. By writing a VUMAT subprogram with nonlinear characteristics, the introduction of a Murnaghan hyperelastic constitutive model is realized. Through a quasi-static superposition dynamic analysis method, the prestress and acoustic wave disturbance are loaded. Through Rayleigh wave signal post-processing, pure Rayleigh wave feature extraction is realized. The method fills the gap of simulation methods in the field of ultrasonic nondestructive testing, especially in the tomographic detection of residual stress, and has great potential.

The utility model provides an ultrasonic non-destructive detector based on wireless communication, which comprises a detector body, the detector body comprises an ultrasonic device, the bottom of the ultrasonic device is movably provided with a supporting seat, the bottom of the supporting seat is movably provided with a movable seat, the movable seat is provided with a sliding chute, and the sliding chute is provided with a wireless communication module. A sliding groove is formed in the base, a sliding block is movably installed in the sliding groove, the sliding block is installed in the sliding groove through a supporting mechanism, a clamping base is fixedly installed on the sliding block, and a fixing bolt is rotatably installed on the supporting base. According to the ultrasonic non-destructive detector based on wireless communication, when the ultrasonic non-destructive detector is used, clamping and fixing of a small pipeline are completed through the clamping seats, the clamping seats move after clamping the pipeline, three-point monitoring is completed through cooperation of the probes, clamping and limiting of a large pipeline are achieved through the probes between the clamping seats, and the ultrasonic non-destructive detector is simple in structure and convenient to use. And the influence caused by easy sliding of the detection point during use is avoided.

The invention belongs to the technical field of ultrasonic nondestructive testing, and relates to a rubber vulcanization degree online monitoring method based on an ultrasonic array, which comprises the following steps: generating a stable acoustic coupling interface on the surface of rubber to be detected; a multi-path composite sound field composed of a short-range high-density path and a long-range crossed path is constructed in the rubber to be measured; forming a multi-channel synchronous sound wave response data set; calculating the similarity of signal waveforms originating from the adjacent probe pairs which are densely arranged in parallel in the multi-channel synchronous sound wave response data set to obtain an acoustic homogeneity index; calculating a sound wave propagation velocity to obtain an average propagation sound velocity; generating a vulcanization state feature vector representing the microcosmic homogeneity and macroscopic rigid coupling state in the current vulcanization process; and determining the absolute vulcanization degree in the current rubber material. According to the method, the problem that a process procedure based on fixed time cannot adapt to performance fluctuation between batches of raw materials, tiny difference of equipment states and temperature gradient in a mold is solved.

The invention relates to the technical field of ultrasonic nondestructive testing and three-dimensional imaging, and provides an image enhancement method based on TransUNet beams. According to the method, training data is generated through acoustic simulation, a low-quality two-dimensional image obtained through single-angle plane wave excitation serves as network input, and a high-quality image obtained after multi-angle data coherent composite processing serves as a label. The constructed TransUNet deep neural network combines the multi-scale feature extraction capability of a convolutional network and the long-range dependence modeling advantage of a Transform module, and is used for learning the accurate mapping relation from sparse data to a high-resolution image. In practical application, the method can perform frame-by-frame enhancement on each cross-section image obtained by single-angle rapid scanning, and finally synthesize a high-precision three-dimensional image, so that efficient and accurate image enhancement of sparse data is realized.

The present disclosure provides a system and method for real-time visualization of a material during ultrasonic non-destructive testing. The system includes a graphical user interface (GUI) capable of showing a three-dimensional (3-D) image of a composite laminate constructed of a series of two-dimensional (2-D) cross sections. The GUI is capable of displaying the 3-D image as each additional 2-D cross section is scanned by an ultrasonic testing apparatus in real time or near real time, including probable defect regions that contain a flaw such as a hole, crack, wrinkle, or foreign object within the composite. Furthermore, in one embodiment, the system includes an artificial intelligence capable of highlighting defect areas within the 3-D image in real time or near real time and providing data regarding each defect area, such as the depth, size, and / or type of each defect.

The invention discloses a concrete ultrasonic propagation characteristic modeling method and system, and relates to the technical field of ultrasonic non-destructive testing, and the method comprises the steps: obtaining the rheological behavior data of unsolidified cement slurry, building a concrete slurry fractional order viscoelastic constitutive model by adopting a Caputo type fractional order derivative, and obtaining a complex modulus; constructing a frequency domain wave equation by using the complex modulus, and calculating ultrasonic attenuation coefficients under different frequencies; dividing the concrete medium into thin layers along the propagation direction, and setting the thickness and characteristic impedance of each layer; a Waterman-Truell model is used to calculate a corrected complex wave number, and a structure factor is combined to correct scattering space correlation; calculating the total attenuation value of the attenuation coefficient of each thin layer, and establishing a propagation path total attenuation model. According to the method, the frequency response consistency is enhanced, the modeling precision of the heterogeneity and the multi-scale scattering characteristic of the concrete is improved, and the method has higher simulation accuracy and physical interpretation.

The invention discloses a multi-connecting-rod-force active controllable ultrasonic flaw detection device and a flaw detection robot, and relates to the technical field of ultrasonic nondestructive detection. The device comprises a linear guide rail, wherein active ultrasonic flaw detection modules are mounted at the two ends of the linear guide rail in a mirror symmetry manner; the active ultrasonic flaw detection module comprises a driving assembly fixedly installed on the linear guide rail, a pressing assembly is fixedly installed at the output end of the driving assembly, and the driving assembly is used for driving the pressing assembly to move up and down in the vertical direction to achieve obstacle crossing. The ultrasonic probe in the detection direction is fixed by the two independent flexible multi-connecting-rod linear structures, and when a detection surface or a welding seam obstacle with a certain inclination angle is encountered in the flaw detection process, the two flexible multi-connecting-rod linear structures are lifted by different heights, so that the self-adaption to the surface of the storage tank in the detection direction and the crossing of the welding seam obstacle can be realized; the driving force of the driving motor is controlled according to feedback data of the pressure sensor, and closed-loop control over the downward pressure is completed.

The application discloses a nonlinear Lamb wave excitation deviation evaluation method and system under dispersion constraint, belongs to the technical field of ultrasonic nondestructive testing and structural health monitoring, and is based on a Rayleigh-Lamb frequency equation and a second-order perturbation theory to construct a second harmonic displacement field model, divides a phase velocity matching mode pair into an intersection type, a longitudinal wave type and a cutoff type; the contraction law of a propagation distance and a mode order on an excitation window is quantitatively analyzed, an excitation tolerance coefficient and a relative gain coefficient are introduced, a two-dimensional quantitative evaluation system of mode pairs is established, three typical mode pairs are divided and are adapted to different detection working conditions, and an aluminum alloy sheet experiment is completed to verify the application. The application adopts the above-mentioned nonlinear Lamb wave excitation deviation evaluation method under dispersion constraint, establishes a standardized mode evaluation system, and significantly improves detection sensitivity and engineering reliability.

The invention relates to an ultrasonic non-destructive testing method for measuring the thickness of each layer of an asphalt pavement surface layer, belongs to the technical field of asphalt pavement thickness measurement, and solves the problem that when the thickness of the conventional asphalt pavement surface layer is measured, the reflected wave signal receiving position cannot be accurately positioned, and the echo arrival time cannot be accurately obtained. And the measurement precision is not accurate enough. The invention relates to an ultrasonic nondestructive testing method for measuring the thickness of each layer of an asphalt pavement, which comprises the following steps of: acquiring interface echoes of each layer of the asphalt pavement by using a transmitting and receiving ultrasonic angle probe, accurately positioning an echo acquisition position, and calculating the thickness of each layer of the asphalt pavement according to the sound velocity and a corresponding geometrical relationship by virtue of a more accurate calculation method for acquiring the arrival time of the echoes; and calculating the asphalt thickness of each layer. The thickness of each layer of the surface layer of the asphalt pavement can be measured losslessly, quickly and accurately.

The present invention discloses a double-layer medium ultrasonic imaging method and related device based on the common tangent point of the wavefront trajectory of the tool center coordinate, belonging to the field of ultrasonic non-destructive testing technology. A workpiece coordinate system is established with a certain point on the workpiece as the coordinate origin, and a linear phased array probe is clamped by a multi-axis scanning system. Based on the tool center coordinates returned at each scanning position, the position and deflection angle of each array element at this scanning position relative to the coordinate origin are inverted; multiple groups of single-shot multiple-receiver ultrasonic echo signals in the full matrix data collected at this scanning position are used to establish several common tangent points between the wavefront trajectory and the curved workpiece, and then the workpiece surface contour line is constructed through interpolation processing; the workpiece surface contour line measured by the wavefront trajectory common tangent point method, the array element position under the tool center coordinates, and the single-shot multiple-receiver mode signal are used to construct an ultrasonic image of the curved workpiece through a double-layer medium delay superposition algorithm, thereby realizing ultrasonic imaging of complex curved surface workpieces under water immersion automated phased array testing conditions.

The invention provides an automatic nondestructive testing device for cylindrical components, and relates to the field of detection, the automatic nondestructive testing device comprises conveying mechanisms (50), a machine vision detection system (10), an eddy current flaw detection system (20), an ultrasonic detection system (30) and a sorting system (40) which are arranged on an operation table top, the sorting system (40) is arranged in the center of the operation table top, and two sides of the sorting system (40) are respectively provided with one conveying mechanism (50); the transmission mechanism (50) on the left side of the sorting system (40) is respectively provided with a visual inspection system (10) and an eddy current flaw detection system (20); and the ultrasonic detection system (30) and the visual inspection system (10) are positioned on the same side of the sorting system (40). According to the device, turbine nondestructive inspection, ultrasonic nondestructive inspection and machine vision inspection are integrated, detection, analysis and judgment on defects of the inner surface and the outer surface of the cylindrical component are achieved, detection blind areas are avoided, and the accuracy and the detection efficiency of defect recognition are improved.

The present invention discloses an adsorption and moving device and a detection method for ultrasonic detection of a wind turbine tower array, comprising: a detection component, including an installation box, an ultrasonic non-destructive detector body is arranged on the installation box, the ultrasonic non-destructive detector body is connected with a probe through a wire, and the probe is used to contact the tower body for detection; a fixing device for fixing the probe; a connecting device for driving the probe to move away from and close to the installation box; a guiding device arranged on the tower body, and the installation box is slidably connected with the guiding device; an angle adjusting device for adjusting the angle of the probe; a pushing device for pushing the angle adjusting device to move in the horizontal direction; a traction device connected with the pushing device. This device and method have the characteristics of high detection efficiency, time saving and labor saving.

The invention discloses a multilayer medium ultrasonic super-resolution imaging method based on virtual source excitation, and belongs to the technical field of ultrasonic nondestructive testing. The method comprises the following steps: 1, selecting an ultrasonic linear array probe; 2, virtual source excitation parameters are determined; 3, delay excitation time of the ith array element in the virtual source excitation group is calculated; 4, placing a phased array probe on the surface of the composite structure test piece, and receiving an echo signal by utilizing ultrasonic phased array excitation receiving equipment; step 5, performing one-dimensional Fourier transform on the collected echo signals along a time axis, and then performing singular value decomposition; step 6, calculating a Green function between the target imaging point and the position of the receiving array element; and step 7, calculating the pixel value of the target imaging point based on the step 6, and realizing the multi-layer medium ultrasonic super-resolution imaging based on virtual source excitation. The ultrasonic super-resolution imaging method aims at overcoming the defects of an existing ultrasonic super-resolution imaging method for the internal defects of the multi-layer medium.

The application provides a transmitting air-coupled dual-frequency piezoelectric ultrasonic transducer, wherein a low-frequency piezoelectric vibrator is arranged in front, and a high-frequency piezoelectric vibrator is arranged in back, and the ultrasonic transducer specifically comprises a high-frequency matching layer, a low-frequency flexible circuit layer, an insulating layer and a high-frequency piezoelectric vibrator arranged in sequence, the low-frequency piezoelectric vibrator is of a multi-element structure, a cavity is etched on the lower surface of the high-frequency matching layer, the low-frequency piezoelectric vibrator is embedded in the cavity on the lower surface of the high-frequency matching layer and is attached to the low-frequency flexible circuit layer, the insulating layer is used for isolating the electrical signals between the high-frequency piezoelectric vibrator and the low-frequency piezoelectric vibrator, and the low-frequency flexible circuit layer is used for exciting the low-frequency piezoelectric vibrator. The application solves the problem that the longitudinal resolution and the sound energy transmission efficiency cannot be considered simultaneously in the field of air-coupled ultrasonic technology. The application belongs to the field of ultrasonic nondestructive testing technology.

The invention discloses an ultrasonic nondestructive testing device and method in the technical field of nondestructive testing of composite materials. The device comprises a flexible detection mechanism, a displacement driving mechanism and a posture adjusting mechanism. The performance detection mechanism comprises a rigid cylinder and a flexible skirt edge, the rigid cylinder is provided with a detection inner cavity, and an opening is formed in one end of the rigid cylinder in the detection direction. The flexible skirt edge is arranged at the opening, the detection inner cavity is provided with an ultrasonic detection probe, and the detection inner cavity is connected with a coupling liquid supply source. And the displacement driving mechanism is used for driving the flexible detection mechanism to translate. The posture adjusting mechanism is used for driving the flexible detection mechanism to deflect. The ultrasonic nondestructive testing device disclosed by the invention is excellent in fitting property, stable in coupling and high in adaptability, and nondestructive ultrasonic testing of large composite material products can be efficiently realized.

The application provides a two-stage ultrasonic nondestructive testing signal high-precision identification method, adopts a two-stage mode to separate ultrasonic normal signal classification and abnormal signal detection, solves the problem that abnormal signal modes are various and cannot be exhausted while ensuring the accuracy of normal signal classification, thereby improving the overall identification precision of ultrasonic nondestructive testing signals; adopts an envelope line feature extraction and fusion method for ultrasonic normal signals, eliminates the positive and negative oscillation phenomenon of ultrasonic signals while retaining the echo position and intensity features of ultrasonic signals, reduces the sensitivity of the algorithm to single values, and further reduces the influence caused by the time shift of normal signal echo features and noise interference. Finally, the local similarity features of abnormal signals are extracted and enhanced, thereby solving the problem that abnormal signal modes are various and cannot be exhausted.

The invention discloses an uncalibrated stress measurement method based on ultrasonic surface wave and incremental deformation mechanics and a related device, and relates to the technical field of ultrasonic nondestructive testing. The method comprises the following steps: exciting an ultrasonic surface wave signal through an excitation sensor arranged on the surface of a test piece to be detected; acquiring an ultrasonic surface wave time domain signal in a stress state by a receiving sensor; the wave velocity is calculated by combining the distance between the sensors and the propagation time, and then the stress value on the detection path is determined according to an ultrasonic surface wave velocity-stress formula. The wave velocity-stress formula is derived from a control equation established based on an incremental deformation mechanics theory and surface wave propagation characteristics, the dependence on a high-order elastic constant in the prior art is avoided from the source, zero-stress test piece calibration is not needed, and the constraint of a calibration result is thoroughly got rid of. According to the method, the advantages of no damage, no radiation and simple and convenient equipment of ultrasonic detection are continued, the applicability and the generalization performance are remarkably improved, and the absolute stress measurement on the surface and the near surface of the test piece can be accurately realized.