18 results about "Radial coordinate" patented technology

The application relates to a generation method of a three-dimensional body grid based on radial growth of a conical surface grid, and belongs to the field of electromagnetic engineering.The generation method comprises the following steps: reading geometric parameters and discretization data of the conical surface grid, screening triangular surface units needing to be processed according to target material numbers, and generating a unit list to be processed; a local coordinate system C is established with a conical axis as a reference, vertex coordinates are converted to the local coordinate system C, and transformed coordinates are obtained; radial coordinate mapping is performed on the triangular surface units in the unit list to be processed, each mapping point is inversely transformed to a world coordinate system, and grown vertex coordinates are obtained; a three-prism body grid is generated by connecting original triangular surface units and the grown vertex coordinates, the three-prism body grid is decomposed into tetrahedron units, and a final body grid is output.The application realizes geometric self-adaptive deformation, ensures unit quality, controls the conical surface curvature error within 0.1%, and supports efficient generation of ten-million-level grids.

A turbocharger turbine wheel can include a hub including an axis of rotation, a back disk, and a nose, wherein the axis of rotation defines an axial coordinate (z) in a cylindrical coordinate system including a radial coordinate (r) and a azimuthal coordinate ( ) along an intended direction of rotation about the axis of rotation; and blades extending outwardly from the hub, wherein each of the blades includes a hub profile, a shroud edge, a leading edge, a trailing edge, a pressure side, and a suction side, wherein the hub profile includes a global maximum radius and a global minimum radius, and wherein, between the global maximum radius and the global minimum radius, in an axial direction from the back disk to the nose, the hub profile includes a local minimum radius at a first axial coordinate location and a local maximum radius at a second axial coordinate location.

The application discloses a fan blade grid dynamic matching method for two-way fluid-structure coupling analysis. The blade discrete deformation data output from a structure solver is used to extract the spanwise coordinate and displacement component, the neutral axis deflection sample is obtained by adopting the robust statistics of the box, the main deflection function is constructed by adaptively fitting Chebyshev polynomial, and the monotone regression constraint is applied. Then, the second-order deformation strength function is identified based on the curvature and the radial coordinate of the cross section, the axial projection shortening term is constructed by combining the large deflection geometric relationship, and the parametric analytical displacement field is formed. The above function is written into a parameter file in a small number of polynomial coefficients, the displacement is evaluated in real time according to the initial coordinates of the nodes in the dynamic grid of the fluid solver, and the coordinate-driven mapping without grid consistency is realized. The application effectively solves the displacement mapping difficulty caused by the inconsistent interface grid, reduces the calculation cost, avoids the dynamic grid distortion, and is suitable for the two-way fluid-structure coupling analysis of the fan blade.

The present application relates to the technical field of optical detection, and particularly relates to a kind of holographic detection optical element processing error global inversion method, comprising: constructing the function relationship of etching depth error about local grating period reciprocal and radial coordinate, as initial etching depth error physical parameterization model;The function relationship of duty cycle error about local grating period reciprocal and radial coordinate is constructed, as initial duty cycle error physical parameterization model;Obtain multiple groups of measured parameters;Multiple groups of measured parameters are substituted into initial etching depth error physical parameterization model and initial duty cycle error physical parameterization model, and etching depth error physical parameterization model and duty cycle error physical parameterization model are obtained;Full aperture design data is brought into etching depth error physical parameterization model and duty cycle error physical parameterization model to obtain etching depth error global distribution and duty cycle error global distribution.The present application is at least beneficial to realize low-cost, high-precision error reconstruction.

The invention relates to the technical field of myopic lenses, and discloses a first-order differential offset-free concentric ring alternating type outer ring defocusing method and a myopic lens. The method comprises the following steps: establishing a radial coordinate system by taking the center of a lens as an original point, and dividing the surface of the lens into a central visual area and an outer ring defocus area; the M concentric rings of the outer ring defocus area are divided into odd rings and even rings to form a ring belt structure with alternating wide and thin rings; and at the boundary position rm, establishing constraint conditions of the mth ring and the (m + 1) th ring in the ring belt structure, and solving a curved surface function of the (m + 1) th ring to form a first-order differential offset-free annular out-of-focus curved surface. The problem of optical aberration caused by first-order differential offset at the junction of the ring belt in the prior art is solved, the first-order differential offset-free design is adopted, and the optical performance and wearing comfort of the lens are improved.

The invention discloses a shield tunnel monitoring method, and the method comprises the steps: obtaining the three-dimensional point cloud data of a measurement point in a shield tunnel, carrying out the coordinate transformation of the three-dimensional point cloud data, obtaining the target point cloud data, and enabling the target point cloud data to comprise the target point cloud data of the measurement point, the target point cloud data of the measurement point comprises the longitudinal coordinate, the azimuth angle coordinate and the radial coordinate of the measurement point, the structure of the shield tunnel is monitored based on the target point cloud data of the measurement point, and the monitoring result of the shield tunnel is obtained, so that the structure of the shield tunnel can be represented by the point cloud data of the longitudinal coordinate, the azimuth angle coordinate and the radial coordinate; the structure of the shield tunnel can be analyzed and monitored in the longitudinal direction, the radial direction and the rotation angle, and complex and indirect three-dimensional rectangular coordinate change analysis is simplified into direct comparison of longitudinal coordinates, radial coordinates and angle coordinates; and the intuition, accuracy and efficiency of longitudinal, circumferential, inter-ring slab staggering and torsional deformation identification are improved.

The invention discloses a magnetic resonance system fault diagnosis method based on multi-parameter radial coordinate visualization, and belongs to the technical field of magnetic resonance. The method comprises the following steps: firstly, performing contribution rate sorting on monitoring parameters under different fault types according to priori knowledge, and rearranging variables; arranging the sorted multiple parameters on the circumference at equal intervals to form a radial coordinate initial projection layout, and iteratively optimizing the weight and the anchor point angle of each dimension by adopting an intelligent optimization algorithm to maximize the Euclidean distance between the fault data and the normal data in a two-dimensional projection space; and carrying out radial coordinate projection on the current test data based on the optimized projection parameters, and judging whether the system has a fault and the specific fault type by calculating Euclidean distances between the current test data and various fault data and normal data projection points. The method can effectively fuse multi-dimensional parameter association information, improves early fault sensitivity and fault traceability accuracy, and has the advantages of high diagnosis efficiency, strong adaptability and small required sample size.

The invention discloses a superconducting motor air gap winding inductance calculation method. The method comprises the steps that a plane polar coordinate system is established; determining a first radial coordinate and a first angular coordinate of the actual position of the first coil on the plane polar coordinate system; determining a first equivalent radial coordinate and a first equivalent angular coordinate of a first equivalent coil of the stator core corresponding to the first coil on the plane polar coordinate system; calculating the first self-excitation inductance of the first coil; calculating a second self-excitation inductance of the first equivalent coil based on the polar distance of the winding, the radius of the inner ring, the first radial coordinate, the first angular coordinate, and a second preset radial coordinate and a second preset angular coordinate of a second preset point on the planar polar coordinate system, and determining a separate excitation inductance of the stator core corresponding to the first coil based on the second self-excitation inductance; and determining the total self-inductance of the first coil based on the first self-excitation inductance and the separate-excitation inductance. Through the method, the calculation difficulty and the test cost of the winding self-inductance are reduced, and the calculation efficiency and the test efficiency are improved.

The invention relates to the field of design of circulating circles of hydraulic torque converters, in particular to an egg-shaped circulating circle design method and structure based on arc connecting lines. Comprising the following steps: calculating an overflowing area according to an outer diameter, an inner diameter and an overflowing coefficient of a circulating circle; calculating radial coordinates of an upper dead center and a lower dead center of the middle streamline according to the outer diameter, the inner diameter and the open area; the upper end arc radius, the lower end arc radius and the connection arc radius of the middle streamline are obtained, and whether the upper end arc radius, the lower end arc radius and the connection arc radius meet constraint conditions or not is verified; according to the design method, the streamline fluency of the circulating circle of the hydraulic torque converter can be improved, and then the transmission efficiency of the torque converter is improved.

The invention relates to the technical field of optical detection, in particular to a computer-generated hologram detection optical element processing error global inversion method, which comprises the following steps of: constructing a function relationship of an etching depth error with respect to a local grating period reciprocal and a radial coordinate as an initial etching depth error physical parameterization model; constructing a function relationship of a duty ratio error with respect to a local grating period reciprocal and a radial coordinate, and taking the function relationship as an initial duty ratio error physical parameterization model; obtaining a plurality of groups of actual measurement parameters; substituting multiple groups of actually measured parameters into the initial etching depth error physical parameterized model and the initial duty ratio error physical parameterized model to obtain an etching depth error physical parameterized model and a duty ratio error physical parameterized model; and substituting the full-aperture design data into the etching depth error physical parameterization model and the duty ratio error physical parameterization model to obtain etching depth error global distribution and duty ratio error global distribution. According to the invention, low-cost and high-precision error reconstruction can be realized at least.

The present application relates to the field of petrochemical industry and environmental protection technology, and particularly relates to a multi-core pipe parallel type main and auxiliary cavity cyclone oil-gas-water separation system and a separation method. The method comprises obtaining the time of flight of reflected sound waves and the Doppler power spectral density diagram of the cyclone separation main cavity; determining the axial coordinate sequence and the radial coordinate sequence based on the time of flight; determining whether the cyclone intensity of the cyclone separation main cavity is qualified based on the height difference of the cyclone liquid column; in response to the unqualified cyclone intensity, determining the adjustment direction of the gas phase outlet back pressure based on the cyclone gas core ratio; based on the qualified cyclone intensity, determining whether the cyclone load of the cyclone separation auxiliary cavity is up to standard based on the frequency spectrum width value, and in response to the unqualified cyclone load, prolonging the liquid phase separation time of the cyclone separation main cavity; based on the qualified cyclone load, determining whether there is a downward trend of the oil-gas-water separation efficiency, and enabling sound early warning when the oil-gas-water separation efficiency has a downward trend. The present application solves the problem of lag in sensing the state fluctuation of the oil-gas-water mixed liquid flow field.

The application provides a motor cover plate processing detection system and method based on visual recognition. The system collects the scattered light image and the reflected light image of the motor cover plate mounting hole area. The gray scale distribution characteristics of multiple concentric ring areas with the mounting hole center as the center are extracted in the scattered light image, and the ring gray scale distribution curve of the motor cover plate mounting hole area is determined by all the gray scale distribution characteristics. The radial coordinate constraint is performed on the ring gray scale distribution curve based on the geometric center coordinates of the motor cover plate mounting hole in the reflected light image, and the confidence ring gray scale distribution curve is generated. According to the confidence ring gray scale distribution curve and the qualified product gray scale distribution curve, the local variance abnormal section of the motor cover plate mounting hole existing hidden cracks is identified. The risk level of the motor cover plate mounting hole area existing hidden cracks is determined based on the local variance abnormal section. The technical scheme provided by the application can accurately detect the hidden cracks of the motor cover plate mounting hole area in the motor cover plate processing process.

A dressing tool for dressing a grinding worm for generating a pre-toothed workpiece is configured to rotate about a dressing rotation axis A and has a dressing flank surface that forms an annulus in a projection plane perpendicular to the dressing rotation axis of the dressing tool, the annulus defining a radial direction by a radial coordinate r and a circumferential direction by an angular coordinate φ. The dressing flank surface is provided with an intentionally generated dress flank modification, and the dress flank modification projected onto the annulus can be described as a two-dimensional Fourier series depending on the radial coordinate r and the angular coordinate φ, the Fourier series having at least one non-zero Fourier coefficient for a circumferential frequency component that is non-zero with respect to the angular coordinate.

The application relates to the technical field of myopic lenses, and discloses a concentric ring alternating type outer ring defocusing method with first-order differential without discontinuity and a myopic lens. The method comprises the following steps: taking a lens center as an origin to establish a radial coordinate system, and dividing a lens surface into a central vision area and an outer ring defocusing area; M concentric ring circles of the outer ring defocusing area are divided into odd ring circles and even ring circles to form a ring belt structure with alternating wide and narrow rings; at a boundary position r m , constraint conditions of an mth ring circle and an m+1th ring circle in the ring belt structure are established, and a surface function of the m+1th ring circle is solved to form a ring defocusing surface with first-order differential without discontinuity. The application solves the optical aberration problem caused by first-order differential discontinuity at the junction of the ring belt in the prior art, adopts the design of first-order differential without discontinuity, and improves the optical performance and wearing comfort of the lens.

The application discloses a kind of neural radiation field volume super-resolution reconstruction methods for brain microhemorrhage detection.First, the low-resolution SWI body data of patient is acquired, sample is constructed by multi-scale coordinate sampling, including: local sparse coordinate sampling is carried out on slice to obtain the first-level coordinate set of hollow patch, then three-dimensional radial coordinate sampling is carried out to each coordinate to obtain the second-level coordinate set;Subsequently, a neural radiation field model is constructed, the sample is input into the model and combined with the spherical body rendering technique to generate the final rendering value;Then, according to the preset super-resolution multiple a interval selection slice constitutes training set and to be reconstructed set, after training the model, the to be reconstructed set is predicted, and finally the high-resolution SWI body data with the number of Z-axis slices increased is obtained.The application does not need paired training data, and the local structure reconstruction fidelity is significantly improved by the innovative sampling strategy, and the unique magnetic susceptibility characteristics of SWI can be accurately reconstructed, which effectively overcomes the shortcomings of the prior art.

The invention discloses a neural radiation field volume super-resolution reconstruction method for brain micro-hemorrhage detection. The method comprises the following steps: firstly, acquiring low-resolution SWI volume data of a patient, and constructing a sample through multi-scale coordinate sampling: performing local sparse coordinate sampling on a slice to obtain a first-level coordinate set of a hole patch, and then performing three-dimensional radial coordinate sampling on each coordinate to obtain a second-level coordinate set; then constructing a neural radiation field model, inputting a sample into the model, and generating a final rendering value in combination with a spherical body rendering technology; according to a preset super-division multiple a, slices are selected at intervals to form a training set and a to-be-reconstructed set, the to-be-reconstructed set is predicted after the model is trained, and finally the high-resolution SWI volume data with the increased Z-axis slice number is obtained. According to the method, paired data training is not needed, the local structure reconstruction fidelity is remarkably improved through an innovative sampling strategy, the specific magnetic sensitive characteristic of the SWI can be accurately reconstructed, and the defects in the prior art are effectively overcome.

The application discloses a kind of normalization-based ReduNet white-box algorithm under spherical coordinate system, belong to ReduNet white-box network field, this method includes obtaining the input data of sample size m under n-dimensional space, and input data is converted from Cartesian coordinate system to spherical coordinate system, obtain the input data under spherical coordinate system;Radial coordinate is 1, define the input data under spherical coordinate system on unit sphere, obtain the normalization data under spherical coordinate system;The normalization data under spherical coordinate system is input as initial feature ReduNet white-box network.The application solves the problem that the feature updated by each layer needs to be normalized by projecting onto the unit sphere when the existing normalization method is applied in ReduNet white-box network.

The invention provides a motor cover plate processing detection system and method based on visual identification. The method comprises the following steps: acquiring a scattered light image and a reflected light image of a motor cover plate mounting hole area; extracting gray level distribution characteristics of a plurality of concentric annular areas taking the center of the mounting hole as a circle center in the scattered light image, and determining an annular gray level distribution curve of the mounting hole area of the motor cover plate according to all the gray level distribution characteristics; performing radial coordinate constraint on the annular gray level distribution curve based on geometric center coordinates of the motor cover plate mounting hole in the reflected light image to generate a confidence annular gray level distribution curve; according to the confidence annular gray level distribution curve and the qualified product gray level distribution curve, identifying a local variance abnormal section with hidden cracks in the motor cover plate mounting hole; and determining the risk level of hidden cracks in the motor cover plate mounting hole area based on the local variance abnormal section. According to the technical scheme provided by the invention, the hidden cracks in the mounting hole area of the motor cover plate can be accurately detected in the machining process of the motor cover plate.