70 results about "Surface fitting" patented technology

The invention relates to the technical field of optical precision machining, in particular to a curvature self-adaptive curved surface fitting method and system in optical element polishing, and the method comprises the steps: obtaining a material height difference removal matrix based on interference measurement data before and after polishing of an optical element; traversing the height difference matrix by using a sliding window mode, calculating a Hessian matrix eigenvalue in a local area, forming a curvature sensitivity index (CSI), dividing an optical surface area into a plane area, a gradual change area and a high curvature area, and setting curved surface fitting parameters in the areas respectively; performing curved surface fitting on the region by adopting a weighted least square method to obtain a continuous surface model, and performing adaptive numerical integration calculation on the continuous surface to obtain a material removal volume; according to the method, the process control requirement of high-precision optical manufacturing can be met, the calculation precision is high, the calculation precision and the calculation efficiency can be maximized, the global efficiency is high, the capability of capturing local features can be achieved, the method can be integrated into an existing quality control system, and process decision making is facilitated.

The invention discloses a face gear on-machine measurement comprehensive error compensation method based on sequential decoupling. Specifically, a sequential decoupling compensation strategy is provided for solving the problem that the measurement precision is limited due to mutual coupling of a measuring head pre-stroke error and a workpiece installation coordinate system error in the prior art. The method comprises the following steps: firstly, establishing a measuring head pre-stroke error model through standard ball calibration, and performing anisotropic compensation on a tooth surface measuring point by utilizing Delou inner triangulation and a weighted interpolation method; secondly, based on the compensated data, the outer cylindrical surface and the tooth top plane of the face gear are accurately fitted through an iterative optimization algorithm, an accurate measurement coordinate system is established, and the initial phase of the C axis is optimized; and finally, reconstructing an actual tooth surface by adopting a two-stage NURBS curved surface fitting method, and calculating a normal deviation. According to the method, an error propagation chain is effectively cut off through a strict execution sequence, the overall precision and reliability of on-machine measurement are remarkably improved, and a key technical support is provided for face gear closed-loop manufacturing.

The embodiment of the invention provides a quadric surface fitting method, a model training method, a model reasoning method and equipment, and relates to the technical field of computer vision, and the quadric surface fitting method comprises the steps: determining a local PCA coordinate system corresponding to a local curved surface where a target point is located through a PCA method; and then, converting a Mongolian equation corresponding to a local curved surface where the target point is located into a local PCA coordinate system to obtain an implicit curved surface equation. Then, solving the implicit curved surface equation according to the position information of the target point cloud block in the local PCA coordinate system, and obtaining the value of an item to be solved; and finally, according to the value of the item to be solved, obtaining a differential characteristic parameter of the local curved surface. According to the technical scheme, the quadric surface fitting precision can be improved, and more accurate differential characteristic parameters can be obtained.

The present application relates to a method for extracting an acetabular facies lunata model, in particular to a method for extracting an acetabular facies lunata model based on mixed surface fitting, which solves the technical problem of low precision and robustness of the existing method for extracting an acetabular facies lunata model. The present application realizes rough extraction of the acetabular facies lunata model through spherical surface fitting, and then realizes accurate extraction of the acetabular facies lunata model in combination with ellipsoidal surface fitting, which combines the stability of spherical surface fitting and the anatomical fidelity of ellipsoidal surface fitting. In particular, in the case of complex pathologies such as hip dysplasia, the present application can still maintain high extraction accuracy, and improve the accuracy and reliability of clinical diagnosis and surgical planning. Meanwhile, in the iteration process of ellipsoidal surface fitting, an adaptive fault tolerance threshold is introduced, which effectively solves the problems of sensitivity to noise and strong parameter dependence of traditional methods, and has better robustness in processing complex acetabular morphology.

1. The name of the design product: cold chain insulation box (curved surface fitting). 2. The use of the design product: for the cold chain transportation of goods. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The application discloses a cambered surface fitting type laser cutting process and device for a wave-shaped metal hyperbolic plate, and the process comprises the following steps: S1, hyperbolic plate parameter acquisition; S2, arc segment segmentation processing; S3, determination of the center coordinates of each segment; S4, initial position adjustment of a laser cutting head; S5, concave arc segment cutting execution; S6, convex arc segment cutting execution; S7, width cycle cutting and path switching. Irregular and difficult-to-control overall wave surfaces of the hyperbolic plate are converted into a plurality of regular and easy-to-position arc units, namely upper arc segments and lower arc segments, and corresponding cutting modes are adopted for the upper arc segments and the lower arc segments, the concave arc segments are rotated around the laser cutting head as the center, the convex arc segments are rotated around the center of the arc segment as the center, the precise adaptation of the cutting posture is realized, the rotation center is flexibly adjusted according to different arc shapes, the laser emission direction or the cutting head feeding track is always fitted to the curved surface, and machining defects such as thermal deformation and burrs are effectively reduced.

We provide a laser ablation system equipped with a robot and processing circuitry. [Solution] The robot has an end effector having a laser component and a camera. The circuit receives an input image of a workpiece from the camera in response to a memory command, segments the image to generate image segments that depict the workpiece, applies a surface fitting algorithm to generate a polynomial surface that fits the inner surface of the segments, calculates a set of surface normal vectors crossing the surface to generate a set of waypoints offset from the polynomial surface, programs a motion path connecting the multiple waypoints, and performs operations including laser ablation of the workpiece surface based on the motion path.

The invention belongs to the technical field of polishing devices, and particularly relates to a projectile body packaging barrel inner wall polishing device which comprises a polishing head assembly, an airflow pressure sensing assembly, a differential motion spiral compensation mechanism, a power unit and a position presetting module. The airflow pressure sensing assembly is used for detecting an original airflow pressure signal corresponding to the polishing gap; the position presetting module is used for recognizing the type of a barrel section where the grinding head is located. The device is further provided with a curved surface airflow correction module and a real-time gap calibration sensing unit. According to the invention, the curved surface airflow correction module is arranged, corresponding coefficients are called according to a barrel section to correct airflow signals, and gap interference caused by curved surface fitting is accurately filtered out; the real-time gap calibration sensing unit is combined to detect the actual gap in real time, a calibration instruction is generated, and the core problems of detection distortion and error accumulation in existing curved surface polishing are solved.

The invention discloses a photoelastic experimental device with a self-adaptive attached loading contact surface, which comprises a cabinet, and also comprises: a test unit, which comprises a bearing frame installed at the upper end of the cabinet, and a sample container installed in the bearing frame and used for bearing a sample; the loading unit comprises a vertical loading assembly which is arranged at the upper part of the bearing frame and is used for carrying out a vertical extrusion test on the sample in the sample container, and a horizontal loading assembly which is arranged on one side of the bearing frame and is used for carrying out horizontal extrusion on the sample in the sample container; and the vertical loading assembly comprises a pressing compensation mechanism used for pressing the sample in the concave area. The pressing compensation mechanism is rotated, and the pressing compensation mechanism fills the concave area, so that the vertical loading assembly can perform extrusion test with the concave area of the photoelastic particles, the photoelastic particles are ensured to be uniformly pressed, and the experiment accuracy is improved.

The present application provides a kind of image vignetting correction method, image processing device and application, this method is under the condition of predetermined photographing environment, using camera to shoot template image under the condition of welding and carry out gray value sampling, surface fitting, with the maximum value of fitting surface equation divided by the surface fitting value of template image, and the result is normalized to obtain normalized dark corner compensation model, based on the normalized dark corner compensation model, the image to be corrected that camera shoots under the condition of predetermined photographing environment is corrected.The present application can quickly find the dark corner compensation model based on template image using simple surface fitting method, correct the image to be corrected, improve image quality, without obtaining complex geometric parameters of optical system in advance, has wide adaptability.The image processing device of the present application can be applied to droplet digital PCR system to improve the accuracy of PCR detection results, and can also be applied to single cell sorting system to facilitate the identification and positioning of nozzle, improve the efficiency of single cell sorting.

The utility model relates to the technical field of supporting structures, and discloses a display screen curved surface fitting supporting structure which comprises a fixing cylinder, a clamping mechanism is installed on the lower middle portion of the outer wall of the fixing cylinder and used for clamping a display screen at the needed position, an adjusting mechanism is installed in the fixing cylinder, and the adjusting mechanism is used for adjusting the display screen. The adjusting mechanism is used for adjusting the position of the display as required; the clamping mechanism comprises a fixing ring, the fixing ring is installed on the lower middle portion of the outer wall of the fixing cylinder, high-carbon springs are fixedly connected to the left side and the right side of the bottom of the outer wall of the fixing ring, and the lower middle portions of the high-carbon springs are slidably connected with moving rings. According to the display screen fixing clamp, after the second adjusting plate is loosened, the high-carbon spring releases the elastic force, so that the movable ring drives the clamping plate to extrude downwards, the display screen is stabilized, the defect that a traditional bolt fixing clamp can move only after being completely loosened is overcome, and the problems that screws are loosened and the fixing strength is reduced due to repeated installation are solved.

The invention provides a bevel gear modeling and deviation measuring method and device based on concentric circle laser, and the method comprises the steps: constructing a concentric circle laser three-dimensional model according to laser contour data of a bevel gear tooth surface, and obtaining a three-dimensional point cloud data set of laser contour points; determining a tooth surface point data set of a corresponding laser layer by performing hierarchical analysis on the radial distance from each point in the three-dimensional point cloud data set to the central axis of the bevel gear; performing curved surface fitting on the point data of each laser layer according to the tooth surface point data set to obtain space curved surface models of the laser layers, and combining the space curved surface models of all the laser layers to generate a bevel gear three-dimensional model; the tooth surface geometric deviation of the bevel gear is measured by extracting tooth surface related characteristic data from the bevel gear three-dimensional model; and determining the precision grade of the bevel gear according to a preset gear precision evaluation criterion. According to the scheme, the problems of incomplete bevel gear precision measurement and low working efficiency can be solved, and the working efficiency of bevel gear precision measurement is improved.

The invention discloses a welding path priority method and welding equipment for an automobile electronic ignition coil, and the welding method comprises the steps: obtaining point cloud data through preset track global scanning, generating a digital three-dimensional model consistent with a welding driving motion coordinate system through Gaussian filtering denoising, iterative nearest point registration, B-spline surface fitting and other strategies, and obtaining a welding driving motion coordinate system; the problem of coordinate deviation of traditional path planning is solved. A contour recognition strategy is combined with region growth, feature extraction and template comparison, and a least square method is used for fitting a center line to serve as a reference track; a node setting strategy is adopted, forced and uniform nodes are scientifically arranged, and accurate positioning of a welding head is guaranteed. A double correction mechanism of molten pool monitoring and node feedback is innovatively adopted, a thermal imager collects images and extracts molten pool parameters after preprocessing, a real-time correction instruction is generated in combination with three-level judgment, a lower node adjustment instruction is generated through image processing after node welding, closed-loop control is achieved, welding defects are reduced, and the percent of pass is increased. Corollary equipment adopts an integrated disc design and is matched with a rotary bearing mechanism to realize batch positioning and conveying, a multi-degree-of-freedom mechanical arm performs automatic welding according to a planned path, parameters are adjusted according to welding seam characteristics, and both precision and production efficiency are considered.

The invention relates to the technical field of automation equipment, in particular to a self-adaptive suction method based on crystal processing equipment, which comprises the following steps: S1, acquiring basic parameters of a tray, planning a measurement path of a laser ranging device according to the basic parameters, and setting the distance between measurement points of the laser ranging device according to the measurement path, the laser ranging device moves along the measurement path and collects measurement data of a plurality of measurement points of the material tray according to the distance between the measurement points; s2, sequentially performing data preprocessing, coordinate system establishment and height curved surface fitting on the measurement data of the plurality of measurement points to generate a curved surface equation; s3, material position coordinates and material height parameters on the material tray are obtained, and then the optimal suction height corresponding to each material position is calculated based on the curved surface equation, the material position coordinates and the material height parameters; and S4, the suction nozzle device executes material suction operation according to the optimal suction height. The crystal suction stability of the suction nozzle device is improved.

The invention provides a method and device for repairing a nickel-based alloy turbine blade through surface nickel plating-laser additive synergistically, and belongs to the technical field of part repairing, the device comprises an electroplating or chemical plating module and a laser printing module; the electroplating or chemical plating module comprises a turbine blade clamping assembly and a nickel plating assembly; the turbine blade clamping assembly comprises a two-degree-of-freedom mechanical arm, a first turbine blade clamping piece is installed on the two-degree-of-freedom mechanical arm, a turbine blade containing groove and a baffle containing groove are formed in the first turbine blade clamping piece, a baffle is inserted into the baffle containing groove, and a screwing nut is installed on the baffle. The laser printing module comprises a shell, a six-degree-of-freedom stewart platform is installed on a base at the bottom in the shell, and a second turbine blade clamping piece is installed on the six-degree-of-freedom stewart platform; and a free-form surface fitting module is mounted at the top of the shell. According to the method, repairing defects such as cracks and holes are eliminated, the interface bonding strength is remarkably improved, and the method has the important significance of reducing the cost and saving scarce resources for repairing the turbine blade.

This invention relates to the field of sheet metal processing technology, specifically a sheet metal leveling device and its control method based on surface fitting. It includes a frame assembly, an upper pressure head array, a lower pressure head array, a hydraulic system, and a control system. The upper and lower pressure head arrays are respectively mounted on opposite upper and lower templates and consist of multiple vertically arranged pressure head units. Each pressure head unit includes a drive element, a displacement sensor, a force sensor, and a pressure head body. The control system controls the pressure head units to collect multi-point height data on the sheet metal surface, generate a heat map, and perform surface fitting to obtain the deviation surface and correction stroke matrix, thereby controlling the corresponding pressure head unit to perform leveling and correction. This enables integrated control of multi-point detection and leveling of the sheet metal.

The invention relates to the technical field of flexible circuit boards, and discloses a control method and system for a three-dimensional curved surface attaching jig of a flexible circuit board, and the method comprises the steps: carrying out the surface scanning of a substrate, obtaining the curvature radius data, arranging a plurality of electromagnetic clamping points, dividing the electromagnetic clamping points into a plurality of sectors, meanwhile, calculating a target pressure value of a driving actuator; the release time interval between the adjacent electromagnetic clamping points is calculated, and a boundary time sequence control program is generated; all electromagnetic clamping points are kept in a locked state and the flexible circuit board is positioned in the pre-lamination stage, a flat area, a transition area and a high-curvature area are processed in sequence in the partition lamination stage, the electromagnetic clamping points in corresponding sectors are released according to a boundary time sequence control program, and corresponding target pressure values are applied. And in the pressure maintaining and curing stage, all the electromagnetic clamping points are switched to the locking state again, and partition heating is started. According to the method, the pressure distribution uniformity is ensured, and the quality defect caused by the too large stress gradient is effectively restrained.

The present application relates to the technical field of image processing, in particular to a kind of auxiliary material curved surface fitting deviation monitoring method based on image processing technology, steps include: S1 establishes the compensation relationship function of vibration frequency and image blurring degree;S2 collects product image before pasting and eliminates vibration blur, extracts outer contour shape and curved surface shape data, calculates theoretical projection area reference value;S3 collects vacuum adsorption auxiliary material image and extracts outer contour;S4 compares product and auxiliary material contour data, corrects displacement difference and angle deviation after vacuum fitting;S5 collects image after fitting, extracts composite contour, actual projection area and auxiliary material edge mechanical fringe density gradient, three meet the determination condition when determining qualified.The present application is through the technical framework of "vibration compensation-curved surface three-dimensional reconstruction-multidimensional collaborative determination", the positioning accuracy of curved surface auxiliary material fitting is improved, detection efficiency is improved, and the risk of mechanical failure, such as rework caused by bubble and wrinkle, is reduced.

The utility model discloses an automatic pressure-maintaining and heating intelligent all-in-one machine for imitating the cambered surface of a crystal ornament, which belongs to the field of pressure-maintaining and heating of the cambered surface of the crystal ornament, and comprises a pressure-maintaining and heating case, a through groove is arranged in the pressure-maintaining and heating case, and the through groove can penetrate through the pressure-maintaining and heating case. According to the automatic pressure maintaining and heating intelligent all-in-one machine for imitating the cambered surface of the crystal ornament, through the arranged pressure maintaining and heating components, a worker firstly places the cambered surface of the imitated crystal ornament in a pressure maintaining and heating area formed by the four groups of pressure maintaining and heating components, and then controls the control panel to enable the four groups of electric cylinders to work; the four sets of heating pieces can be pushed to clamp and position the cambered surface of the imitated crystal ornament, and the four sets of heating pieces can heat the cambered surface of the imitated crystal ornament by starting the heating pieces, so that a glue solution in the cambered surface of the imitated crystal ornament is melted and pressure is applied to the glue solution, and the cambered surface of the imitated crystal ornament is heated. And the fitting degree of the imitated crystal ornament and the cambered surface fitting piece can be further improved.

The invention discloses a Dynamo-based cooling tower steel bar one-key sample turning device and method, and belongs to the technical field of cooling tower construction. The device comprises an Excel data input module, a Dynamo core calculation module and a result output module. A standardized Excel structure and design parameters are imported, a Dynamo core calculation module utilizes a parameter linkage mechanism and a segmentation fitting algorithm to accurately generate a steel bar three-dimensional path attached to the hyperbolic cylinder wall, and automatic collision detection and path optimization functions are combined to output numerical control machining codes and an engineering quantity list. According to the method, the problems of low curved surface fitting precision, slow design change response and high rework rate of traditional manual sample turning are solved, digitization and automation of the whole reinforcing steel bar sample turning process are realized, and the construction precision and efficiency are remarkably improved.

The invention discloses a clamping mechanism, a flexible clamping module and a curved-surface case shell profiling clamping method.According to the technical scheme, the clamping mechanism comprises multiple sections of curly clamping upper arms and multiple sections of curly clamping lower arms, and the multiple sections of curly clamping upper arms and the multiple sections of curly clamping lower arms are each composed of a plurality of rotatable sections in a rotating mode; according to the method, an actual curved surface fitting area is determined through an effective section recognition method, coordinate data of effective nodes in the area are extracted, curve fitting is carried out by using a least square method to calculate the curvature, and the curvature of the curved surface fitting area is calculated. According to the curved surface fitting method and device, accurate recognition and high-precision self-adaptive clamping fitting of the shape of the curved surface can be achieved, and the technical problems that in the prior art, curved surface clamping precision is low, and adaptability is poor are effectively solved.

The application provides a process window prediction method based on curved surface fitting, relates to the field of lithography technology, and comprises a prediction system, wherein the prediction system comprises a control module, a measurement data processing module, a model simulation module, a process window analysis module and a visualization module. The technical scheme predicts the process window through curved surface fitting, simultaneously considers the influence of Focus / Dose parameters on CD, has smaller fitting result error, is more accurate in process window prediction, comprehensively analyzes the interactive influence of illumination dose and focusing position through a three-dimensional curved surface fitting method, overcomes the overfitting problem of single parameter fitting of a traditional Bossung graph and EL graph, generates a larger and more stable common process window, reduces the prediction error from 8% to 4.8%, increases the process window area by 12%, and significantly improves the prediction accuracy of the pattern quality of all positions of the wafer.

The application discloses a van identification and pose calculation method, which comprises the following steps: 1, an initial point cloud is acquired by using a loading robot TOF camera, and is converted to a world coordinate system through coordinate transformation; 2, local point clouds meeting a normal vector threshold are screened out through pretreatment and surface normal vector calculation; 3, bottom surface fitting is performed on the local point clouds; 4, local point clouds in a rear door bottom edge area are screened out; 5, linear fitting is completed by selecting feature points at a set interval; 6, boundary points of left and right frames of the rear door are determined, two lower corner points of the rear door are obtained by projecting the boundary points on the fitted straight line, and a midpoint of the rear door bottom edge is calculated; 7, an axis of the van is calculated, a lower midpoint of the upper frame of the rear door is determined, and finally complete van pose information including a van deflection angle, a coordinate of the midpoint of the rear door bottom edge, a van width and a van height is calculated. The application can accurately and quickly realize van pose calculation under a complex environment, so that the automatic loading task of the loading robot is realized.

This invention belongs to the field of medical technology and discloses a rapid bone repair implant manufacturing method based on medical imaging and 3D printing. The method first involves CT scanning of the damaged bone area to obtain image files, then using Mimics software to reconstruct a 3D model. The model is imported into 3-Matics software for preprocessing, and a composite repair algorithm combining mirror symmetry and surface fitting is used to digitally repair the bone defect. The repair model is then converted to STL format and sliced, 3D printed using biocompatible materials, sterilized, and implanted into the patient. The innovations of this invention lie in the collaborative processing of Mimics and 3-Matics software, the composite repair algorithm combining mirror symmetry and surface fitting, and the end-to-end digital solution. This allows for personalized and precise customization of implants, reduces the risk of rejection, significantly improves repair accuracy and manufacturing efficiency, shortens the treatment cycle, reduces medical costs, and shows promising clinical application prospects.

The application relates to a passable area evaluation method based on three-dimensional point cloud B-spline surface processing, B-spline surface fitting is performed on three-dimensional point cloud data, the surrounding environment of a mobile robot is expressed in a parameterized form, the environment is reconstructed in a surface smoothing mode, the gradient of any point on a map is calculated through the parameterized surface after fitting, and the passability is evaluated based on the information and the passing ability of different robots; the parameterized surface form is adopted to continuously represent the passing difficulty, and finally, a point cloud map with a passable cost label is obtained. The B-spline surface fitting is used to solve the passable area evaluation problem of the mobile robot in the outdoor natural environment, the parameterized surface environment expression can utilize the scene continuity feature and save certain storage space, in addition, the reasonable simplification of the area passing cost standard under the condition assumption of the natural environment guarantees the calculation efficiency in the passable cost evaluation stage.

This invention discloses a method for 3D reconstruction of asphalt pavement texture, belonging to the fields of road detection and computer vision technology. The method first calibrates an industrial camera to obtain intrinsic parameter matrices and distortion coefficients, and then continuously acquires pavement images at short intervals of 1 to 2 centimeters on a moving vehicle. Next, the images undergo preprocessing including cropping, Gaussian kernel convolution for noise reduction, and 8 to 12 low-pass filtering convolution enhancements. Feature points are matched using the SIFT algorithm combined with a limited neighborhood range strategy of 80 to 120 pixels. Subsequently, based on the matched points, the fundamental and essential matrices are solved using the RANSAC algorithm and the 8-point method. The camera pose is optimized using bundle adjustment to obtain an initial point cloud, followed by kdtree clustering and statistical filtering for dual noise reduction. Finally, bending deformation is corrected through quadratic polynomial surface fitting, tilt is corrected using projection transformation, and the model scale is adjusted according to the scaling factor to obtain a standardized 3D model. This method effectively solves the problem of weak asphalt texture matching and achieves efficient and high-precision pavement texture reconstruction.

The application discloses a borehole wall roughness measurement system and method. The method comprises the following steps: creating a general elliptic cylindrical surface fitting equation, and creating a fitting reference surface according to the general elliptic cylindrical surface fitting equation; configuring the fitting reference surface in a borehole wall coordinate system; expanding the borehole wall coordinate system along the fitting reference surface to obtain an expanded plane of the fitting reference surface; obtaining a plurality of axial sampling lines parallel to a borehole axis of the expanded plane; obtaining borehole axial profile lines corresponding to the axial sampling lines; and obtaining axial roughness evaluation parameters of the borehole axial profile lines.

The invention relates to the technical field of hardware polishing, in particular to a multi-face matched precise hardware polishing device which comprises a mechanical arm, a connecting part is installed at the moving end of the mechanical arm, and the connecting part comprises a butt joint column and a shell rotationally arranged on the outer arc face of the butt joint column in a sleeving mode; the output end of the connecting part is in butt joint with an inclined part, and the inclined part comprises a universal joint and a transmission shaft fixedly connected with the bottom of the universal joint; the outer cambered surface of the transmission shaft is rotationally sleeved with a rotary disc, the bottom face of the rotary disc is provided with a plurality of rotationally-connected butt joint frames, the butt joint frames are rotationally connected with the elastic telescopic end of the elastic telescopic rod, and the grinding head can actively incline through an inclined part formed by a universal joint, so that the mechanical arm can grind the area which cannot be touched by a traditional rigid structure; and the application range of the mechanical arm polishing process is greatly expanded, and the problem of'machining dead angles' existing in the industry for a long time is solved.