65 results about "Cylindrical coordinate system" patented technology

The invention discloses a low-frequency sound propagation loss forecasting method suitable for a polar region sea area, and the method comprises the steps: building a two-dimensional ice layer model of a forecast sea area according to remote sensing data based on the setting that sea ice of the polar region sea area is a uniform elastic medium; calculating hydrological conditions of the ocean sound channel of the polar sea area; establishing a forecast sea area two-dimensional seabed model according to the seabed topography sediment database; an under-ice sound field model is constructed based on a three-dimensional cylindrical coordinate system, sound pressure from unit intensity sound sources with different sizes and depths to a receiving point in a forecast sea area is calculated through a frequency domain finite element method in combination with a PML technology, and sound propagation loss of a needed position is obtained through calculation. According to the method, the application limitation of traditional ray and normal wave theories under complex boundary conditions is broken through through a finite element method, a synergistic effect mechanism of actual ice layer parameter space change, submarine topography fluctuation and sound velocity profile gradient characteristics is systematically analyzed, and sound field modeling is more accurately carried out on different ice layers and submarine topographies in the Chukong sea region all year round; the influence of sound wave propagation is simulated.

The embodiment of the invention discloses an electromagnetic wave logging detection depth determination method and device, a medium and a program product. The method comprises the steps that a conductivity disturbance stratum model under the homogeneous medium background condition is established, a multi-component transmitting and receiving antenna combination mode is simulated, a lower step signal source serves as an excitation source of transient electromagnetic wave logging, and a homogeneous medium transient electromagnetic wave logging response model is determined; according to the electromagnetic wave logging response perturbation model and the uniform medium transient electromagnetic wave logging response model, a sensitivity function of induced electromotive force is determined; determining a radial integral sensitivity function under a cylindrical coordinate system according to the sensitivity function of the induced electromotive force; and determining the detection depth of transient electromagnetic wave logging in the target time range according to the radial integral sensitivity function. According to the scheme, specific analysis can be carried out in combination with instrument parameters and signal definition, the detection performance evaluation problem of time domain signals measured in a well is solved, and the detection depth of transient electromagnetic wave logging equipment is accurately determined.

The invention relates to the technical field of artificial intelligence, and discloses an eggshell crack detection method and system based on a convolutional neural network. The method comprises the following steps: synchronously obtaining multi-modal data of an egg through multispectral transmission imaging and three-dimensional structured light measurement; performing rigid registration and expansion on the data under a cylindrical coordinate system to generate a multi-channel fusion feature map with space alignment; inputting into a convolutional neural network of an encoder-decoder structure to carry out pixel-level crack segmentation, and outputting a crack probability graph; and after thresholding and connected domain analysis, judging whether the egg contains cracks or not according to a geometrical characteristic judgment criterion. The system comprises a multi-modal image acquisition module, a data preprocessing and fusion module, a crack feature extraction and classification module and a decision execution module. According to the method, through cooperation of multi-modal information fusion and the deep learning model, the accuracy and robustness of crack detection are remarkably improved, and the method is suitable for a high-speed automatic sorting scene.

The invention discloses a cement production equipment fault early warning method and system, and relates to the technical field of cement production equipment health monitoring, and the method comprises the steps: building a cylindrical coordinate system on the surface of a rotary kiln cylinder, and dividing the cylindrical coordinate system into a plurality of independent visual monitoring surface elements; collecting infrared and visible light image sequences in multiple working conditions and multiple continuous rotation periods for each visual monitoring surface element in a healthy state, and constructing a healthy visual fingerprint reference library representing stable state characteristics of the visual monitoring surface element; according to the method, the rotary kiln cylinder visual monitoring surface elements are divided, the healthy visual fingerprint reference library is constructed, real-time accurate comparison is achieved in combination with the twin neural network, cylinder state monitoring can be comprehensively covered, and limitation of local monitoring is avoided; and through time sequence deviation degree calculation and spatial correlation analysis, the deterioration trend and spatial correlation characteristics of the fault precursor can be captured in an early stage, and the early warning timeliness is greatly improved.

The invention discloses a surface damage positioning method suitable for an ultrahigh-strength concrete wind power mixing tower. The surface damage positioning method comprises the steps that benchmark identification pieces containing radio frequency chips and visual recognition patterns are annularly arranged at the preset height of a tower at intervals; the inspection equipment carries a millimeter wave radar, a binocular vision camera and a radio frequency identification module to spirally cruise along the tower drum, and synchronously obtains initial coordinates, real-time image streams and radar reflection signals; correcting the image flow and extracting features, establishing pixel and physical space mapping in combination with the size of the reference identifier, and generating an initial three-dimensional grid model; radar signals are analyzed, mutation feature points are extracted, and a suspected damage area is preliminarily positioned in combination with a three-dimensional grid; controlling equipment to perform fixed-point shooting, extracting damage contour features and calculating actual geometric parameters; the parameters and the physical coordinates are imported into a cylindrical coordinate system conversion model, the damage height, the circumferential angle and the distance between the damage height and the nearest reference identification piece are output, and accurate positioning is achieved; and reliable data support is provided for operation and maintenance of the wind power mixed tower.

The invention discloses a fire source positioning method and system based on combination of thermal imaging and laser ranging, and relates to the field of fire prevention and control. Acquiring a thermal image, an original image and point cloud data of a target area, identifying a fire source candidate area, constructing a cylindrical coordinate system taking one end of a central axis of the fire source candidate area as an original point, and generating a three-dimensional model containing fire source space attitude and obstacle information; adjusting the shooting angle of the thermal imager in combination with the three-dimensional model, and planning a surrounding path containing an effective detection point location; the mobile carrier is controlled to move along the path, and a three-dimensional space constraint matrix is generated; performing Lie algebraic fusion on the thermal imaging signal features and a three-dimensional space constraint matrix in a symplectic geometric space, dynamically adjusting a laser ranging covariance weight through a confrontation recognition model, and mapping the laser ranging covariance weight into a space coordinate of a fire source in a cylindrical coordinate system; and calculating the Riemannian manifold distance between the positioning coordinate and the pre-path data, and when the Riemannian manifold distance exceeds a threshold value, re-sampling the data, updating the model weight and re-positioning. According to the invention, the fire source positioning precision is greatly improved.

The invention discloses a turbine blade flutter evaluation method adopting a single-channel harmonic balance model. The method comprises the following steps: 1, carrying out structural grid division on a turbine blade to obtain a vibration mode, a vibration frequency and a vibration pitch diameter of a vibration blade; 2, performing fluid grid division on the turbine blade to obtain grid coordinates under a cylindrical coordinate system; 3, aligning the coordinates of the structural grid and the fluid grid to obtain a vibration mode of the fluid grid; 4, adopting a Doppler frequency shift effect to obtain blade vibration frequencies, vibration pitch diameters and inter-blade phase angles of other blade rows except the blade row where the vibration blades are located; 5, realizing mutual transmission of upstream information and downstream information of the rotor-stator interface; 6, single-channel unsteady harmonic balance analysis is achieved; and step 7, evaluating the stability of the turbine blade flutter system. According to the method, the flutter of the multiple rows of turbine blades is evaluated, and the method has the characteristics of low calculation cost and high evaluation accuracy.

The invention discloses an intelligent ship 360-degree horizontal panoramic image stitching method, which comprises the following steps: acquiring all sequence frame images corresponding to each camera video according to a camera array, and traversing each pixel point in a corresponding initial stitching panoramic image by constructing a panoramic image hash mapping function according to a set panoramic image width to obtain a panoramic image sequence; performing projection processing on each pixel point in the cylindrical coordinate system to obtain a three-dimensional projection coordinate point, projecting the camera internal reference to an image pixel coordinate system to obtain an image pixel point, and determining a pixel contribution weight of the camera in an image area in the corresponding panorama based on the image pixel point; according to the pixel contribution weight and the three-dimensional projection coordinate point, a hash key value pair is inserted in combination with a panorama hash mapping function so as to fill panorama pixels, and a horizontal panorama of the corresponding sequence frame is acquired; according to the invention, the problems of insufficient resolution, dynamic adaptability, real-time performance, maritime environment applicability, intelligent navigation information perception capability and the like of the existing panoramic splicing scheme are solved.

The application belongs to the technical field of magnetic parameter measurement, and discloses a device and a calculation method for testing magnetic force in each direction between permanent magnets. The device uses an electric sliding table and a vertical sliding table to construct a three-dimensional motion platform, and collects the magnetic force of a tile-shaped permanent magnet under different spatial displacements in real time through a sensor. The device can not only meet the force testing needs of the inner / outer rotor permanent magnet under the axial, radial and tangential misalignment states, but also can adapt to different sizes of the inner / outer rotor permanent magnet by adjusting the clamp. Meanwhile, the magnetic force calculation method proposed by the application takes the equivalent magnetic charge model under the cylindrical coordinate system as the theoretical basis, and accurately solves the three-dimensional magnetic force of the inner / outer rotor permanent magnet under any spatial relative position through quadruple integration. With the help of the testing device and the calculation model proposed by the application, the precise measurement and theoretical verification of the magnetic force in each direction of the permanent magnet can be realized, the calculation is simple, and the degree of coincidence is high. The testing and calculation method has engineering universality and convenience.

This invention discloses a system and method for locating corona discharge in generator stator windings. The system includes a track, two symmetrical supports, and a controller. The supports are I-shaped with adjustable support rod height. A movable crossarm slider is mounted on the crossarm rod, with both ends fixed to the crossarm slider. A track slider is fitted onto the track, enabling circumferential rotation and axial stepping movement. A laser mapping and modeling device and a corona discharge detection device are fixed opposite to each other on the track slider. The method includes: system layout; track center calibration; laser mapping and modeling to establish a cylindrical coordinate system; background noise detection; abnormal discharge detection under rated voltage; and data comparison to screen for true discharge points. This invention achieves blind-spot-free detection throughout the entire stator winding. By establishing a dedicated coordinate system through laser mapping and modeling, combined with ultraviolet and acoustic fingerprint detection methods and background noise comparison, it achieves precise coordinate positioning of corona discharge points, adapting to different generator models and automating operation.

The invention discloses a method and system for determining the convection heat effect of a karst-type geothermal system, and the method comprises the steps: measuring thermophysical parameters of a rock sample from a target region, converting the thermophysical parameters into a cylindrical coordinate system, forming a rock thermophysical column, constructing a geothermal geologic model, and based on the thermophysical parameters, combining the flow characteristics and heat transfer characteristics of underground water in the target region, calculating the convection heat effect of the karst-type geothermal system. Constructing a geothermal geology mathematical model; only configuring the thermal boundary condition to the mathematical model to obtain the thermal flux at the boundary of the model; meanwhile, the thermal boundary condition and the constant pressure boundary condition are configured in a geothermal geology mathematical model, the heat flux is combined, the heat gathering effect of free convection at the boundary of the model is obtained as the free convection heat effect, and the thermal boundary condition, the constant pressure boundary condition and the water head boundary condition are further configured in the mathematical model at the same time; and in combination with the heat-gathering effect of free convection, obtaining the heat-gathering effect of forced convection at the boundary of the model as the heat-gathering effect of forced convection. The quantitative research on the heat gathering mechanism of the karst type geothermal system is realized.

This invention provides a dual-hole collaborative electromagnetic wave and laser fusion detection system for karst geological structures, belonging to the fields of precision geotechnical engineering detection and intelligent sensing technology. Based on a probe assembly, this invention heterogeneously fuses the geometric representation of laser point clouds with electromagnetic wave medium inversion data using a unified cylindrical coordinate system. The system quantifies hidden disaster-causing factors by calculating the deep karst development index and cavity volume morphology index; it uses a spatial Euclidean distance difference algorithm to calculate the minimum safe partition wall thickness, accurately locating high-risk sectors of rock wall penetration. Furthermore, the system adjusts the scanning step distance in real time based on the wave velocity gradient and generates an adaptive grouting control strategy. This invention effectively eliminates single detection blind spots, achieves three-dimensional visualization and risk quantification assessment of hidden karst, and improves the safety and scientific decision-making of pile foundation construction in complex geological environments.

The application relates to the technical field of permeability calculation, and discloses a permeability calculation method for a circular cross-section ferrite magnetic core in a toroidal inductor; when the magnetic field intensity is calculated, high-frequency analysis is carried out based on Maxwell equations, the characteristic that the magnetic field in the circular cross-section ferrite magnetic core in the toroidal inductor is uniform is used, and a virtual variable Bessel equation is derived based on a cylindrical coordinate system, and the magnetic field intensity calculation model is obtained by solving the equation, so that the limitation that the traditional measurement method needs to depend on a measuring device is broken. When the electric field intensity is calculated, the electric field intensity calculation model is obtained based on the relationship between the electric field intensity and the magnetic field intensity in the Maxwell equations. Based on the calculated magnetic field intensity and electric field intensity, the complex power of the toroidal inductor is calculated, and then the permeability prediction model is obtained in combination with an equivalent circuit model. The application is based on theoretical model calculation, is not limited by specific frequency bands and measuring instruments, is also applicable in a high-frequency range, and the predicted permeability is more accurate.

The invention relates to a pure finite element method, in particular to a pure finite element method for calculating a circumferential horizontal shear guided wave frequency dispersion curve. The method aims at solving the problems that an existing method needs complex programming and long calculation time, and consequently the solving process is complex and low in efficiency. The method comprises the following steps of: 1, adding a periodic boundary condition; establishing a finite element model of a pipeline periodic unit under the cylindrical coordinate system in finite element software; 2, parameterized scanning is carried out to solve the characteristic frequency; the invention belongs to the technical field of guided wave dispersion curve calculation.

The application discloses a spacecraft single-pulse absolute reachable set solving method based on differential algebra technology and belongs to the technical field of on-orbit motion of space spacecrafts; firstly, a geocentric inertial coordinate system, a geocentric geodetic rotating coordinate system and a cylindrical coordinate system are established, and a dynamics model of on-orbit motion of the spacecraft in the cylindrical coordinate system is established; then, the earth shape perturbation, the solar pressure perturbation and the third body gravity perturbation of the sun and the moon are converted into the cylindrical coordinate system for representation, and a dynamics model considering multiple perturbation forces is obtained; finally, the absolute reachable set is solved in the dynamics model considering multiple perturbation forces based on Jet Transport technology; the dynamics model considering multiple perturbation forces is established in the cylindrical coordinate system, the absolute reachable set is solved by using Jet Transport technology based on the dynamics equation, and the absolute reachable set is simulated by using C++ and MATLAB; compared with the traditional Monte Carlo method, the solving method based on Jet Transport technology is high in accuracy and calculation efficiency.

The invention discloses a modal shape and frequency identification method for a motor stator system with an inner gear ring, and the method comprises the steps: building a shell unit and beam unit mixed analysis model of the motor stator system provided with the inner gear ring, and obtaining a total stiffness matrix and a total mass matrix under a local rectangular coordinate system through a matrix displacement method, obtaining a structural stiffness matrix and a structural mass matrix under the overall cylindrical coordinate system by using coordinate transformation; and establishing a discrete free vibration model, inputting the structural stiffness matrix and the structural mass matrix into the model, and outputting modal shapes of different orders and corresponding inherent frequencies of the motor stator system, thereby completing identification. The method comprehensively considers the influence of the stator teeth and the tooth part of the inner gear ring, helps to rapidly identify the modal shape and inherent frequency of the stator system, provides guidance for subsequent vibration acquisition and optimization, and has the advantages of simple modeling, rapid identification and high precision.

The invention relates to the technical field of hydrofracture micro-seismic event monitoring, in particular to a distributed optical fiber micro-seismic event positioning method and device, and the corresponding method comprises the steps: determining a vertical foot corresponding to a micro-seismic event according to the form of an event of the micro-seismic event in a seismic section corresponding to the micro-seismic event in a fractured well; determining the monitoring well and the perpendicular foot radius of the perpendicular foot in a cylindrical coordinate system; wherein the original point of the cylindrical coordinate system is the vertex of the event; and according to the radius of the perpendicular foot and the length of the fractured well, performing energy scanning on each grid under the cylindrical coordinate system in a plane which passes through the perpendicular foot and is perpendicular to the fractured well so as to position the microseism event. According to the method, the plane where the seismic source occurs is determined, and then seismic source scanning is performed only in the plane, so that the method has the advantages of high calculation precision and high calculation efficiency. And rapid real-time positioning of the distributed optical fiber fracturing microseism event can be ensured.

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 present application relates to the technical field of visual detection, and discloses a visual detection method and system for injection molding and bottle blowing based on quality online monitoring, which comprises the following steps: constructing a cylindrical coordinate system of a bottle body and a virtual anchor point array, obtaining a virtual anchor point reference position data set, constructing a matching template, obtaining a displacement vector set and a grid defect map; selecting a target area in the grid defect map, establishing an optical transfer function matrix and combining abnormal pixel distribution data to obtain a phase difference set and three-dimensional feature data of defects; establishing a multi-dimensional research and judgment model based on the three-dimensional feature data of defects, obtaining a key parameter set, and formulating a data detection method containing a rejection system and a self-protection system. The present application realizes adaptive identification of defects, accurate rejection of unqualified products and self-protection of equipment, and improves the real-time detection and production line efficiency. The present application solves the problems of fixed area not adapting to dynamic deformation of the bottle body, misjudgment caused by light interference and large rejection deviation in traditional detection.

A borehole stability index can be determined by using received user inputs and received subterranean formation characteristics. The portion of the subterranean formation characteristics that represent the rock stresses can be transformed to a coordinate system, such as a cylindrical system. Subterranean formation parameters can be calculated from the transformed characteristics. A lithology-specific algorithm can be applied to the subterranean formation parameters to generate a borehole stability index. The borehole stability analysis can then be performed using the subterranean formation parameters. The borehole stability analysis can be performed at incremental radial distance layers into the subterrane formation from a borehole wall. The borehole stability analysis can be performed at various measured depth layers within a measured depth interval of the borehole where the borehole stability index is the algorithmic combination of the individual calculated borehole stability indexes at each measured depth layer.

The invention is suitable for the technical field of heat conduction analysis, and relates to an underground granary heat insulation performance simulation method based on axisymmetric geometric analysis, which utilizes a non-uniform rational B-spline (NURBS) primary function to accurately represent a geometric shape and approximate a physical field, realizes the unification of modeling and analysis data, and improves the heat insulation performance of an underground granary. The axisymmetric characteristics and boundary conditions of the granary are fully utilized, geometric analysis system equations and solving formats such as the axisymmetric heat conduction problem are deduced in a cylindrical coordinate system from an axisymmetric steady-state heat conduction problem control equation on the basis of the variational principle, and a general three-dimensional problem is reduced into a two-dimensional problem; efficient utilization of the degree of freedom of calculation is achieved, then temperature field and heat flux density distribution characteristics of a granary body-soil body system are analyzed, the influence rule of different conditions on underground granary heat conduction is revealed through parameterization research, and a high-order continuous interpolation basis function is introduced to obtain a high-order continuous interpolation basis function; the calculation precision and calculation efficiency of underground granary temperature field analysis are effectively improved.

The invention discloses a reticulated shell structure-based prepreg yarn fiber placement trajectory tracking control method and device, and the method comprises the steps: fusing all groups of local point cloud data under multiple perspectives into a global point cloud under a unified reference coordinate system through a point cloud registration algorithm; the global point cloud is converted into a cylindrical coordinate system, and layered scanning is carried out in the axis direction of the target latticed shell structure; performing fusion noise reduction and geometric feature calculation on the point cloud data obtained by hierarchical scanning, and identifying and extracting a groove boundary curve on the target reticulated shell structure based on curvature features; converting the coordinate system of the global point cloud and the coordinate system of the groove boundary curve into an execution mechanism coordinate system, and generating a track planning result of a fiber placement path based on preset process constraints; the trajectory planning result is used for being combined with a controller of the execution mechanism to form a composite control strategy, so that tracking and dynamic error compensation are carried out on the fiber placement trajectory of the execution mechanism. And the problem of difficulty in tracking the fiber placement trajectory of the prepreg yarn is solved.

This invention discloses a method for measuring the coaxiality of a large thin-walled box. The box to be measured is placed vertically on a horizontal support ring. An auxiliary reference cylinder is constructed using a laser plumb line. A geodetic horizontal cylindrical coordinate system is established. A self-leveling laser line projector is used to select cross-sectional circles at different heights of the box, and the coordinates of each measured point on the surface of the box in the geodetic horizontal cylindrical coordinate system are calculated. The coordinates of each measured point at the same height are used to fit the circumference of the cross-section, obtaining the center, diameter, and roundness of the cross-section circle at each height in the cylindrical coordinate system. A straight line is fitted using the center of the cross-section at each height, and the straightness of the fitted line is the coaxiality of the box. Compared with existing technologies, this invention overcomes the limitation of laser distance on the size of the box, meeting the coaxiality measurement requirements of large-size thin-walled welded boxes. Furthermore, it ensures the safety of personnel climbing to heights during the laser tracker measurement of the target ball placement process.

The invention discloses a direct-current cable grounding grid fault assessment method during alternating-current cable grounding fault, which comprises the following steps: enabling the alternating-current cable grounding fault to be equivalent to a point current source, and obtaining the total fault current of the point current source and related engineering parameters; calculating the current of the fault current flowing into the DC cable grounding grid; constructing a two-layer soil potential field general solution by using a cylindrical coordinate system, and constraining an upper-layer potential expression and a lower-layer potential expression respectively according to an air-soil interface and a lower-layer soil infinite boundary condition; applying potential continuity and normal current density continuity conditions at the junction of the upper layer soil and the lower layer soil, solving an undetermined coefficient and constructing a surface potential caused by an alternating current ground fault; and solving the earth surface potential by using an integral identical equation, and superposing the earth surface potential with the reference potential of the direct-current grounding grid to obtain the total coupling potential of the direct-current cable grounding grid so as to evaluate whether the direct-current grounding grid has a fault or has an over-limit risk. According to the invention, the safety of the DC cable grounding grid under the condition of AC / DC same tunnel laying can be rapidly and accurately evaluated.

The application discloses a human-computer interaction situation awareness method and system based on a big data center, relates to the technical field of human-computer interaction, and comprises the following steps: constructing a cylindrical coordinate system and sector units based on the outer surface of a stress cone of a dry pluggable terminal and the outer surface of the stress cone of the dry pluggable terminal, and counting the number of discharge events of the sector units; screening a plurality of sector units segmented in the axial direction of the cylindrical coordinate system based on the number of discharge events, obtaining skeleton sector units, and determining an angular central angle; constructing a spiral development plane based on the angular central angle, and generating a spiral channel contour curve on the spiral development plane; obtaining a coverage ratio according to the spiral channel contour curve; receiving an input confirmation instruction based on the coverage ratio, and generating a structural situation confirmation mark; and outputting a structural degradation situation result based on the structural situation confirmation mark; and the application improves the consistency of terminal structure state management.

This invention provides a method, system, device, and storage medium for filtering ground point clouds from a lidar system. The method includes the following steps: mapping each point in the lidar coordinate system to a three-dimensional coordinate system and encoding it to obtain a point cloud set; performing structured encoding on each point based on the three-dimensional coordinates; filtering the point cloud based on at least the line beam index, pitch angle index, and distance index to the lidar center of the current point's two neighboring points; filtering to distinguish between environment points and ground points by sequentially querying the information of the current point's upper and lower neighboring points based on the horizontal angle index; calibrating to the vehicle coordinate system, encoding the filtered point cloud using the cylindrical coordinate system, and filtering the point cloud again based on neighboring point information; and removing point clouds generated by the vehicle body based on prior information to obtain the environment point cloud. This invention can improve the efficiency of the algorithm by retaining environment points and filtering out ground points and noise points in the point cloud through structured encoding of the point cloud and conditional querying of neighboring points.

The application provides a deep-sea T-phase calculation method and system based on a seafloor seismic source mechanism, and the method comprises the following steps: determining calculation physical quantities in an elastic multilayer ocean crust medium and a fluid deep-sea sound channel for a deep-sea seafloor seismic T-phase propagation process, and establishing an acoustic wave-seismic wave combined elliptical differential equation in a two-dimensional cylindrical coordinate system; the elliptical differential equation is converted into an acoustic wave-seismic wave combined parabolic differential equation, a horizontal recursive equation in a root form of the acoustic wave-seismic wave combined parabolic differential equation is given, an initial field horizontal recursive equation in the root form suitable for a seafloor seismic event is established, the horizontal recursive equation in the root form is converted into an N p step loop recursive equation, numerical discrete processing is performed on operator action in the loop recursive equation, a representation form of calculation quantities of virtual points in a discrete process is given, and a seismic wave field in an ocean crust medium and an acoustic wave field in a deep-sea sound channel are obtained according to the loop recursive equation.

The invention relates to an electric machine (100) as traction motor of a motor vehicle (200). It comprises a housing (10), a stator (11) and a rotor (12), which extend along a common longitudinal axis (L). Said longitudinal axis (L) forms a cylindrical coordinate system and is oriented parallel to the x-y plane of a vehicle coordinate system (FKS). The stator (11) is delimited in the longitudinal axial direction by two end faces (131, 132), between which a cylindrical inner lateral surface (14) for receiving the rotor (12) extends. The stator (11) contains a plurality of hairpins (15), a subset of which forms an outermost row (161). Said hairpins (15) are interconnected in order to generate a rotating magnetic field and protrude from the stator (11) on at least one end face (131, 132). Outside the stator (11), the hairpins (15) are bent tangentially at least in portions and have at least one uppermost point (20) in relation to the vehicle coordinate system (FKS). The housing (10) has a cooling medium guide (17) with cooling medium outlet openings (18) which are arranged in such a way that, in the intended installation position, the emerging cooling medium (23) acts on the uppermost points (20) of at least 30%, 40% or 50% of the hairpins (15) of the first subset.

The present application relates to the technical field of industrial vision detection, in particular to a kind of aluminum bar surface defect vision detection and grading classification method, comprising: projection multi-frequency sinusoidal structured light obtains original image sequence, executes subpixel level vibration motion compensation, is calculated under the cylindrical coordinate system after multi-frequency difference frequency phase unfolding, generates defect area three-dimensional height map;Adopt two-stream Transform network fusion two-dimensional gray scale and three-dimensional height map, to joint feature executes graph neural network inference, outputs vision classification result and confidence;When confidence is lower than threshold value, self-adapting trigger vortex and ultrasonic detection, with multimodal abnormal characteristics are registered in space-time and are aggregated by DS evidence theory, output defect type label;Based on three-dimensional height map, calculate equivalent volume and defect perimeter minimum curvature radius, combined with stress concentration factor, output defect severity level.The present application overcomes aluminum bar high-speed rotation and strong light interference, improves defect detection effect.

The invention discloses a stress and rigidity analysis method under a multi-waveform diaphragm disc angular load, which comprises the steps of defining geometric and working condition parameters, constructing a segmented deflection model, establishing a non-axisymmetric stress analysis model and deducing an angular rigidity analysis formula. Deducing a deflection expression of the maximum deformation section by segmenting the corrugated molded line and setting continuous conditions of displacement, slope and curvature; establishing a bending-torsion coupling model through a cylindrical coordinate system, and obtaining radial, circumferential and tangential stress analytic expressions in combination with Hooke's law; and the total bending moment is solved by performing circumferential integration on the infinitesimal bending moment and the shearing force, and the angular stiffness is calculated, so that integrated analytic solution of the deflection, the stress and the stiffness is realized. According to the method, high-precision prediction of the angular mechanical behavior of the complex corrugated diaphragm disc is achieved, the calculation efficiency is high, the result is stable and consistent, a large amount of finite element iteration can be effectively replaced, and a reliable tool is provided for structural optimization and engineering design of the diaphragm disc coupler.