51 results about "Defect reconstruction" patented technology

The invention discloses a ferromagnetic pipeline quantitative lossless evaluating method based on nonlinear magnetic saturation pulsed eddy current. An electromagnet coil is conducted with high direct current to form a strong static magnetic field so that a detected object can be magnetically saturated, pulse excitation and pulse signal detection are finished on a TR type pulsed eddy current probe when the detected object is in the magnetic saturation state, and quantitative lossless evaluating on the local thinning defect in a ferromagnetic pipeline is achieved based on a magnetic saturation pulsed eddy current nonlinear efficient direct problem signal simulation method and a defect reconstruction inverse problem algorithm. The method has the advantages of being free of contact, easy to achieve and operate, high in detecting efficiency and the like and can be widely applied to the quantitative lossless evaluating on the local thinning defect of a large number of ferromagnetic material pipeline containers used in a power station, chemical engineering and other structures.

The invention discloses a three-dimensional magnetic flux leakage testing defect contour reconstruction method and a device. The three-dimensional magnetic flux leakage testing defect contour reconstruction method comprises following steps: a forward finite element calculation model is constructed; characteristic constants of a defect magnetic flux leakage field are extracted; initial estimate values of defect contour parameters are obtained based on the characteristic constants, and the initial estimate values are introduced into the forward finite element calculation model as input values for iterative computations so as to obtain leakage magnetic field predicted values, wherein the defect contour parameters are updated via heuristic optimization algorithm so as to obtain defect contour parameter expectancy values and realize defect reconstruction. The three-dimensional magnetic flux leakage testing defect contour reconstruction method is capable of increasing defect reconstruction efficiency; stability is high; calculation is accurate; and speed is high; so that it is beneficial for increasing of reconstruction speed and precision of irregular defects.

The invention relates to a magnetic flux leakage testing defect reconstruction method based on an improved artificial bee colony algorithm. According to the method, a radial basis function neural network is used as a forward model, and an error square sum of a magnetic flux leakage signal predicted by the forward model and an actually measured magnetic flux leakage signal is used as a target function to improve the artificial bee colony algorithm; a current individual optimal solution and a global optimal solution are introduced to accelerate algorithm convergence speed; the improved artificial bee colony algorithm is used as an iterative algorithm to solve a reconstruction problem, and the finally obtained global optimal solution is a reconstructed defect outline. The magnetic flux leakage testing defect reconstruction method based on the improved artificial bee colony algorithm improves speed and precision of magnetic flux leakage testing defect reconstruction.

The invention discloses a high-pressure container detection method based on an infrared image splicing fusion algorithm. The method comprises the following steps: performing data acquisition on the surface of a high-pressure container; performing K-means and GMM algorithm combined processing on all column vectors, and processing video stream signals to obtain a defect reconstruction image; for thereconstructed defect information images including the overlapping regions in pairs, adopting a FAST-SURF algorithm to perform feature extraction, adopting a bidirectional FLANN algorithm to perform rough matching, an MSAC algorithm is adopted to purify matching point pairs, and a geometric transformation model is estimated, so that an image registration process can be realized; processing the splicing result by adopting a fusion method based on brightness adjustment and distance weighting according to the gap and brightness and color difference generated by the splicing result; obtaining a panoramic spliced image for infrared detection of the high-pressure container; the invention provides the high-pressure container detection method based on an infrared image splicing fusion algorithm aiming at the requirements of large volume and in-situ detection of a high-pressure container, and the speed and the precision of image splicing are comprehensively considered.

The invention discloses an in-situ test device for three-dimensional defect reconstruction. The in-situ test device comprises a hollow framework structure and a transmission mechanism, wherein baffles are symmetrically arranged on the left and right sides of the framework structure respectively, a left crossbeam and a right crossbeam are connected in a sliding manner between the baffles through a guide rail, a rotating lead screw connected with the left crossbeam and the right crossbeam is further arranged between the baffles, and a lifting electric motor connected with the rotating lead screw is arranged on one side of the framework structure; and tail shafts with synchronizing wheels are respectively arranged on the left crossbeam and the right crossbeam, a load sensor connected with the tail shafts is arranged on the left crossbeam or the right crossbeam, clamps for loading test pieces are connected to the tail shafts, a stepping motor is arranged at the lower part of the framework structure, and a grating ruler is arranged at the upper part of the framework structure. By virtue of combined use of the in-situ test device and an X-ray detection instrument, the automatic rotation of the test pieces can be realized in situ under the loading condition, so that the X-ray transmission imaging is realized, and phenomena of formation, expanding paths and expanding rate of microcracks of materials can be observed online.

The invention relates to a magnetic flux leakage testing defect reconstruction method based on an improved particle swarm optimization algorithm. According to the method, self-adaption mutagenic factors are introduced into a particle swarm EPUS-PSO algorithm based on an effective population utilization strategy, thus obtaining the IEPUS-PSO algorithm, and then the IEPUS-PSO algorithm is applied to defect reconstruction in magnetic flux leakage testing. With the improved algorithm, the reconstruction accuracy is improved, the computation time is reduced, and the defect outline can be reconstructed by magnetic flux leakage signals for defects of different sizes.

The invention provides an acetabular defect reconstructive prosthesis, which comprises an ilium support and an acetabulum cup, wherein the ilium support comprises a support base and a connecting wing plate which is arranged on the support base; the support base gets into contact with an ilium; and the acetabulum cup is connected to the support base in a rotatable mode. According to the technical scheme of the invention, problems of the prior art on peripheral acetabular defect reconstruction and long-term stability are effectively solved.

The application of the invention discloses a bilateral jaw defect reconstruction pre-operation design method and device based on a database having a three-dimensional configuration. The method and the device are based on the preset database, a healthy head which is mostly accepted by a head to be repaired is selected from the preset database to be used as reference, a bilateral extensively-defected jaw part is reconstructed, and the bilateral extensively-defected jaw lacking uninjured side contrast can also be reconstructed to have appropriate jaw shape and prosthesis shape.

The invention relates to a method for quantitatively reconstructing a complex boundary contour of an interlayer debonding defect based on an infrared detection image signal, which comprises the following steps of: firstly, building an infrared thermal imaging temperature field measuring system, processing and manufacturing a multilayer structure flat plate test piece containing the debonding defect; then measuring a transient temperature signal of an upper surface area of the flat plate test piece by using the built infrared detection system, and calculating a differential temperature variablerate signal image as a reconstruction characteristic signal; and secondly, based on a simulation calculation method of a transient temperature field numerical model and a defect reconstruction inverse algorithm, providing a parameterization method of the debonding defect complex boundary contour of a Fourier series approximation radial method so as to achieve efficient and accurate quantitative nondestructive evaluation of the debonding defect complex boundary contour of the multilayer structure. The method can efficiently and accurately reconstruct the boundary contour of the debonding defect, has the advantages of simple principle, convenient and easy operation, small data volume, high quantitative efficiency and the like, and can be widely applied to quantitative evaluation of the interface debonding defect of multilayer welding mechanisms in nuclear power and chemical industry.

The invention relates to a construction method of an individualized mandible defect reconstruction guide plate system. According to the invention, a postoperative mandible model is designed and reconstructed according to the mandible ideal reconstruction form; a virtual individualized titanium plate model is designed; mandible positioning nail paths are designed at the corresponding positions of the titanium plate model and the mandible remaining bone section models on the two sides; supply area bone section positioning nail paths are designed at the positions, corresponding to all supply areabone sections, of the titanium plate model, a mandible osteotomy guide plate model is designed, a supply area bone osteotomy shaping guide plate model is designed, and an individualized titanium plate, a mandible osteotomy guide plate and a supply area bone osteotomy shaping guide plate of a solid body are manufactured through 3D printing. The accurate positioning between the individualized guideplate system and the lower jawbone of the patient can be better achieved, the construction process of the optimized guide plate system is easier, more convenient and more efficient, and accurate positioning of matching between remaining bone sections of the lower jawbone, all bone cutting sections of a supply area bone and a titanium plate can be achieved.

The invention relates to an axial symmetry workpiece ellipse-like defect reconstruction method. The method includes: adopting an axial symmetry workpiece ultrasonic detection system to collect signals of an actual workpiece; utilizing an amplitude threshold method to recognize defect reflection echo, and extracting time features; calculating a distance from the surface of a defect to the surface of the workpiece; according to a principle that the boundary of the defect is tangential with wavefront arcs, adopting a circle to approximate an elliptic arc section, and fitting an elliptic model tangential with all wavefront arcs. The method avoids errors of conventional methods based on transmission time delay in the aspect of the principle, is more convenient to operate than reverse time inversion methods and is suitable for ellipse-like defects of bubbling and mingling.

The invention discloses a 3D printing-based acetabular bone defect reconstruction method. The method comprises the following steps: S1, preparing and representing a titanium metal implant subjected to electron beam melting 3D printing, and detecting cell compatibility; s2, in-vitro characterization of biological characteristics of the titanium metal implant subjected to electron beam melting 3D printing; s3, in-vivo characterization of biological characteristics of the titanium metal implant subjected to electron beam melting 3D printing; and S4, clinical research of the titanium metal implant subjected to electron beam melting 3D printing. According to the scheme, based on CT three-dimensional reconstruction of the acetabular bone defect form, a digital cushion block filler model is established by means of computer-aided design (CAD), and a personalized metal cushion block implant with good biological characteristics is manufactured by means of an electron beam melting (EMB) 3D printing technology, so that effective reconstruction of the acetabular bone defect is achieved, and the acetabular bone defect is effectively reconstructed. Therefore, a new solution is provided for the bone defect problem in the hip joint revision.

The invention discloses a mandible reconstruction method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the CT data of a sampled person, carrying out the three-dimensional reconstruction, selecting the related feature points of a mandible according to a preset scheme, and storing the coordinates of the related feature points, so as to build a normal mandible database; performing virtual osteotomy to obtain a mandible defect model; performing standardization processing on the mandible defect model according to the mandible related feature points, and performing retrieval matching in the normal mandible database through a preset mandible database retrieval matching algorithm to obtain the most similar mandible; and registering the most similar mandible obtained by retrieval and matching with the defective mandible model. A reference with high repeatability except for doctor experience is provided for digital design of repairing and reconstruction of midline-crossing mandible defects, second-stage lower jawbone defects and double-side-surface asymmetric mandible defects, and the defects and deficiencies of a mirror image technology in clinical application are effectively overcome.

Aspects of the present invention provide implants for augmentation, stabilization, or defect reconstruction of bone tissue, comprising a scaffold portion structured to provide shape to the implant, the scaffold portion comprising one or more of the following: one or more polylactic acid isomer; one or more polyglycolic acid isomer; and/or allogenic bone material, or similar compound.

The invention discloses an infrared technology defect reconstruction and feature extraction method based on additive fuzziness, and the method comprises the steps of building a multi-region defect reconstruction model through an infrared thermal image sequence of a test piece to be detected, and reconstructing the defects in different space regions through variational Bayes inference. In the collected data, the signals representing internal defects are weak, and the noise may be introduced by the parameter hypothesis during a defect reconstruction process, so that we need to highlight the internal defect information, and remove the noise interference, and accordingly the color features and the contour features of the images are extracted through a color extraction filter and an edge contour extraction filter, then by carrying out optimization processing on the defect color image, and finally fusing the optimized color image and contour features through inverse transformation, the defects of different space-time regions can be described clearly.

The invention relates to a three-dimensional irregular defect contour reconstruction method based on an improved trust region projection algorithm. According to the invention, a detection region is firstly selected from to-be-detected ferromagnetic materials, magnetic charge density of the detection region is calculated by using a cuckoo search algorithm, and distribution of the magnetic charge density is further utilized to construct a unit magnetic dipole band superposition model of a three-dimensional irregular shape defect; then, an estimated signal is compared with a real signal by using the unit magnetic dipole band superposition model, and a proper sampling region is selected; and finally, an improved trust region projection Levenberg-Marquart algorithm is provided for ill-posed nature of a three-dimensional irregular defect reconstruction problem, and reconstruction of an irregular defect contour is achieved. Compared with the prior art, the method does not need a large amount of magnetic flux leakage detection data, reduces the problem of too many iterations in a heuristic optimization algorithm, and achieves the higher precision of a reconstruction result.

The invention discloses a no-reference SH wave guide method used for flat plate thinning defect quantitative detection. Defect reconstruction is conducted on a flat plate by means of no-reference SH wave guide, and the specific position and shape of a defect are given. The method includes the steps that mode separation is conducted on a total field, and a reflection coefficient of a required SH wave guide mode is obtained; a green function in the no-defect flat plate is solved, and a approximate solution of a far field is obtained; a boundary integral equation is solved, and the shape of the defect in the flat plate is reconstructed in a no-reference mode. The method relates to a quantitative detection technology, people do not need to refer to the approximate position of the defect in advance, a defect expression is directly induced theoretically, a whole component can be detected at a time, an efficient and precise scheme is provided for ultrasonic wave guide quantitative detection, the method has important application value in engineering, and a whole structure can be detected at a time. Detection can be conducted without removing coating and insulating layers, and complex rotating and walking devices are not needed. Defect sensitivity and precision are high, energy consumption is low, and the method is economical.

The invention discloses a defect detection method and device, defect detection equipment and a computer storage medium, and the method comprises the steps: inputting an image, and carrying out the wavelet transformation of the image for many times; respectively obtaining a target image set corresponding to each wavelet transform in the multiple wavelet transforms, the target image set comprising alow-frequency image and high-frequency images in three directions corresponding to the low-frequency image; and carrying out post-processing on the target image set to obtain a defect reconstructionmap; and performing curved surface fitting-based defect detection on each low-frequency image; performing defect reconstruction by using corresponding high-frequency images, so that defects with different shapes and random positions are effectively detected, defects with different sizes are effectively detected by adopting multi-scale analysis of wavelet transform, and the precision and the accuracy of defect detection are improved.

The invention discloses an eddy current thermal imaging defect reconstruction method based on electrical impedance tomography. The method comprises the following steps of firstly, acquiring a thermal image sequence in a heating stage, performing curve fitting on pixel points in the thermal image sequence to obtain a reference image of which the temperature is changed along with time, then extracting a current matrix and a magnetic potential matrix from the reference image, and acquiring conductivity distribution meeting conditions according to an iterative formula so as to obtain a reconstructed image representing the defect and realize identification of the shape of the defect.

The invention relates to a 3D printing individualized customized bionic micropore acetabulum mortise and tenon patch and a manufacturing method, the mortise and tenon patch is of a 3D printing solid structure, the upper edge and the lower edge of the inner side face are connected with one side edge of the upper surface and one side edge of the lower surface respectively to form a tenon structure embedded into the acetabulum bone defect position. The upper edge and the lower edge of the outer side surface are respectively connected with the other side edges of the upper surface and the lower surface to form an integral mortise and tenon patch structure in a surrounding manner; the lower surface is arc-shaped, and the radian of the lower surface is the same as that of an acetabular cup prosthesis; through the arrangement of the four forms of threaded holes, multi-angle fixation of the mortise and tenon patch can be guaranteed, the stability is guaranteed to the maximum extent, and sideslip or displacement is prevented. And through bone-like trabecular bionic micropores are formed in the mortise and tenon patch. The problems that in the acetabular bone defect reconstruction process in the prior art, the rotation center of a hip joint cannot be recovered easily, an implant and a bone defect form are not matched, bone ingrowth of the implant is poor, and initial and long-term stability is poor are solved.

The invention discloses a rock micro-defect three-dimensional reconstruction method. The method comprises the following steps: performing global scanning on a rock sample by adopting a laser scanner to obtain rock appearance feature point cloud data; sequentially layering and numbering the appearance feature points, correspondingly determining a position point and a check point of each layer, andcompleting the construction of a rock sample appearance three-dimensional structure frame; according to different position points, using a CT scanner to scan and sort the rock samples layer by layer,and acquiring rock micro-defect images; verifying the image layering sequence of each position point according to the verification point of each layer; and assembling the verified rock micro-defect images into a rock sample appearance three-dimensional structure frame according to a layered scanning sequence to obtain a rock micro-defect reconstruction three-dimensional structure diagram. The method solves problems that surface micro-defects are easy to ignore and the edge precision is insufficient when rock micro-defect three-dimensional reconstruction is carried out by pure CT scanning, andthe invention provides a laser and CT scanning combined rock micro-defect three-dimensional accurate reconstruction method and system.