38 results about "Equidistant" patented technology

The invention discloses a three-dimensional curved surface pattern layering processing method based on parameterized segmentation, and aims to solve the problem of high-precision pattern processing on the surface of a curved surface by using a laser scanning galvanometer. The method comprises the following steps: firstly, importing a three-dimensional model, and carrying out parameterization processing to obtain a two-dimensional parameter domain; positioning a to-be-processed plane pattern in the two-dimensional parameter domain to form a complete two-dimensional geometric grid covering a pattern area, generating a three-dimensional pattern grid attached to a curved surface, and calculating a center normal vector of the three-dimensional pattern grid; then, generating an equidistant plane group on the surface of the curved surface, and calculating an intersection line of the plane and the three-dimensional pattern grid as a laser scanning track; and the five-axis linkage platform-galvanometer system is started for machining. Through the parameterization domain, distortion of curved surface pattern machining is effectively solved, machining uniformity is improved, and the method is particularly suitable for laser machining of large-scale or high-complexity curved surface patterns.

The invention discloses a composite shell structure topology and fiber angle optimization and equal-interval path generation method. The invention relates to the field of topological optimization and continuous fiber reinforced composite material additive manufacturing, and aims to solve the problem that continuous, equidistant and manufacturable fiber paths are difficult to obtain for a composite shell structure in the prior art. According to the method, based on isogeometric analysis and a Riisner-mindlin shell theory, with flexibility minimization as a target, topology and fiber angle collaborative optimization is carried out on a curved surface shell structure, and a macroscopic topology form and unit fiber orientation are obtained. And extracting an optimized structure boundary and mapping the optimized structure boundary to a parameter space, constructing a grey-scale map through a density field to identify a parameter space boundary, performing fairing by adopting an NURBS curve, and then mapping the optimized structure boundary back to a physical space to form a smooth space boundary. And extracting a structural skeleton in the parameter space and mapping the structural skeleton to a physical space. And based on the smooth boundary and the skeleton, generating a space fiber path meeting the equidistant requirement.

The application discloses a device and method capable of realizing all-around real-time monitoring of tunnel structure deformation. The device comprises multiple non-contact displacement sensors, a rotating support assembly, a three-dimensional space locator assembly, an inclination sensor and a control unit. The multiple non-contact displacement sensors are equidistantly arranged along tunnel walls on the same cross section of the tunnel and are fixed through the rotating support assembly; the rotating support assembly can realize scanning measurement along the cross section and the longitudinal direction of the tunnel. The three-dimensional space locator assembly is used for monitoring the position change of the base point of the sensor, the inclination sensor is used for accurately controlling the scanning angle of the first rotating assembly, and the control unit is responsible for coordinated control and data processing. The application integrates automatic scanning, multiple sensor data mutual verification, environmental compensation and remote monitoring functions, can realize real-time, continuous and accurate monitoring of various deformation parameters such as tunnel ellipticity, segment misalignment and cross section convergence, significantly improves the monitoring efficiency and precision, and guarantees the tunnel operation safety.

The invention relates to the field of metering and calibrating devices, and discloses a contact network geometric parameter measuring instrument calibrating device which comprises a supporting column and a base, the outer side of the supporting column is fixedly connected with two first connecting plates and two second connecting plates, and the second connecting plates are located above the first connecting plates; a cutting inclined plate is fixedly connected to the close sides of the first connecting plate and the second connecting plate, a guide frame is fixedly connected to the outer side of the cutting inclined plate, a plurality of adjusting mechanisms are arranged outside the cutting inclined plate and the guide frame, a lifting mechanism is arranged at the top of the base, and the lifting mechanism is used for simulating the height difference of a steel rail. In the rough adjustment mode of height adjustment of the simulation contact line, the position of the movable frame is fixed through a plug pin and a limiting pin by utilizing a cutting inclined plate and an equidistant combination hole, the height of the simulation contact line can be rapidly adjusted by taking a fixed distance as a unit, and the movable frame freely slides to realize precise adjustment in the fine adjustment mode, so that the high-precision test requirement is met.

The invention relates to the technical field of tool path planning, and discloses a combined curved surface constant residual height fixed-axis machining tool path generation method and a storage medium, and the method comprises the steps: firstly, discretizing a combined curved surface into a triangular mesh, and calculating the height of a collision-free tool location point above a machining part through adaptive quadtree sampling; forming a net-shaped structure of a discrete three-dimensional configuration space; projecting the processing area to the space for cutting, and determining an effective processing area; taking the boundary of the area as an initial seed polygon, outwards expanding line segments of the boundary into a cylindrical surface in a limited range, intersecting the cylindrical surface with the configuration space to generate a next circle of equidistant cutter location points, connecting the equidistant cutter location points to form a new cutter path, and iterating the process until the processing area is filled. According to the method, tool path selfing is fundamentally eradicated, the method is completely independent of the normal direction of the curved surface, the method is not sensitive to the model quality, the interference-free and equal-residue-height high-quality tool path can be generated in a full-automatic and high-robustness mode, and the reliability, efficiency and quality of complex curved surface numerical control programming are greatly improved.

The invention aims to provide a flow separation prediction method based on a mechanical energy gradient, and belongs to the field of flow separation prediction. Comprising the following steps: inputting a physical field and geometric conditions; selecting a monitoring interval; generating curve equidistant points in the interval based on the monitoring interval; generating corresponding tangent lines and angles based on the equidistant points; according to the obtained tangent line and the corresponding angle, speed conversion of the corresponding monitoring point is completed in combination with an existing physical field, and the speed conversion comprises the tangential speed and the normal speed. According to the method, curve equidistant points can be divided in the monitoring interval, the angle of the corresponding position is obtained to correct the relative speed, and a plurality of corresponding speed molded lines are generated according to the curve equidistant points, so that the relative speed molded lines are compared under the condition that uniform curve intervals are ensured, and the effectiveness and rationality of speed molded line comparison are ensured.

The invention discloses a complex test scene perception and partition construction method based on a multi-modal large model, and belongs to the technical field of digital test verification of high-end equipment. According to the method, a scene description prompt is designed, a multi-modal large model is utilized to generate a 2D test scene image with an equidistant view angle, and images with consistent semantics are screened through similarity calculation. Secondly, extracting spatial positions, semantic information and three-dimensional geometric parameters of objects in the scene by adopting a detection segmentation model and a depth estimation technology, and generating a feature map fusing space and semantics; and finally, geometric and texture description of an object is generated based on a multi-modal large model, a 3D grid is constructed by using a 3D generation model, model parameters are adjusted through dense matching and iterative optimization, and category accuracy and spatial coherence are ensured. According to the method, the full-process automation from 2D scene generation to 3D refined reconstruction is realized, and the precision and efficiency of complex test scene construction are remarkably improved.

The present invention discloses a method, device, equipment and medium for underground pipe network data acquisition and detection. The method comprises: taking the center line of the target underground vertical pipeline as a reference, downwardly obtaining the edge point coordinates of the spatial plane where each equidistant point is located; preprocessing the edge point coordinates corresponding to each equidistant point, fitting the preprocessing results by the least squares method, and generating a corresponding first characteristic image; judging whether there is a gap on the first characteristic image corresponding to each equidistant point, and if there is a gap, judging whether there is an underground horizontal pipeline connected to the target underground vertical pipeline at the corresponding equidistant point; obtaining the edge point coordinates at both ends of each gap, fitting the edge point coordinates at both ends of each gap by the least squares method, and generating a corresponding second characteristic image; fitting each first characteristic image and each second characteristic image to generate an underground pipe network characteristic image and visually displaying it; the present invention saves time and labor, is more intelligent, and can adapt to different application scenarios.

The invention relates to the technical field of ship manufacturing, in particular to a ship curved surface self-adaptive spraying control method and system.The method comprises the steps that a target ship curved surface is scanned, three-dimensional point cloud data of the surface of the target ship curved surface is obtained, curved surface reconstruction and curvature calculation are conducted, and the ship curved surface is dynamically divided into spraying sub-areas according to curvature change characteristics; for each spraying sub-region, matching an optimal initial spraying parameter set from a pre-stored spraying process parameter database, generating a spraying path which ensures that the tail end of a spraying gun keeps a constant optimal distance from the curved surface by adopting equidistant bias based on the geometrical characteristics of each sub-region, and planning a global movement sequence of a robot; and controlling the mobile robot platform and the spray gun to execute spraying operation, monitoring spraying state parameters in real time through a sensor in the execution process, comparing the spraying state parameters with expected values, and dynamically adjusting spraying parameters through closed-loop control so as to realize uniform coating coverage, dynamically adjust execution parameters and ensure the spraying quality.

The invention aims to provide a speed profile generation method based on relative coordinates, and belongs to the field of fluid analysis. Comprising the following steps: inputting a physical field and geometric conditions; selecting a monitoring interval; generating curve equidistant points in the interval based on the monitoring interval; generating corresponding tangent lines and angles based on the equidistant points; according to the obtained tangent line and the corresponding angle, speed conversion of the corresponding monitoring point is completed in combination with an existing physical field, and the speed conversion comprises the tangential speed and the normal speed. According to the method, curve equidistant points can be divided in the monitoring interval, the angle of the corresponding position is obtained to correct the relative speed, and a plurality of corresponding speed molded lines are generated according to the curve equidistant points, so that the relative speed molded lines are compared under the condition that uniform curve intervals are ensured, and the effectiveness and rationality of speed molded line comparison are ensured.

The present invention relates to the technical field of bearing ring measurement, and specifically to an inner diameter measuring instrument and a measuring method for a bearing ring, including: an L-shaped base, on the upper end surface of the horizontal section of the base, a moving frame is slidably arranged left and right, a rectangular plate is fixedly arranged on the left end surface of the moving frame, and a measuring mechanism is arranged between the rectangular plate and the moving frame. First, the present invention emits laser through the laser emitter in the laser ranging device and receives it by the laser receiver, and finally obtains the distance between the two points. The required inner diameter value of the measurement point is obtained by adding this distance to twice the distance from the fixed block to the corresponding ball. The point contact between the ball and the inner wall of the ring reduces the error of the measurement result. Secondly, during the rightward movement of the transverse movement block by the equidistant group, multiple measurements of the inner diameter of the ring are completed from left to right. And by rotating the rotating plate and the ring, the outer ring rod is matched with the locking holes at different positions, so as to realize multi-point inner diameter measurement at different positions of the inner wall of the ring.

The present invention relates to a method for defining a path of a laying head (1) for laying a tyre assembly on a core (4), comprising a step (a) of geometrically characterizing a profile in which a first set of geometrically significant points (PP1,...PPn) is provided which represent the shape of the profile (10), a step (b) of functionally characterizing the profile in which a second set of functionally significant points (PF1,...PFm) is provided which are associated with laying rules which specify laying conditions of the tyre assembly and which are stored in a path table, a step (c) of gridding in which a series of equidistant virtual points called "potential guide points" (PG1,...PGp) is defined on the profile (10) from the first functionally significant point (PF1) to the last functionally significant point (PFm), followed by a step (d) of simplification in which the size of the path table is reduced by applying one or more selection criteria to the path table so as to select a portion of the potential significant points (PGk) and of the significant points (PPi, PFj).

This invention relates to the field of optical measurement and calibration technology, and in particular to a method, medium, and apparatus for calibrating a plane reference mirror in a vertical interferometer. The method involves placing a calibration plate as a temporary mirror under test in the measurement optical path of a vertical Fizeau interferometer. At at least one measurement point, the calibration plate is continuously rotated around its own rotation center. The rotation centers at each measurement point are offset from the central optical axis of the plane reference mirror and equidistant. Multiple frames of surface shape measurement data are collected at each measurement point, and the absolute surface shape error of the plane reference mirror is obtained by arithmetic averaging of all measurement point data. This method, through the specific offset measurement point settings, systematically changes the spatial orientation of the calibration plate at different points, offsetting central symmetry errors and suppressing asymmetric errors and random noise. It achieves high-precision and robust absolute calibration without the need for complex algorithms. Compared with traditional methods, it combines accuracy, efficiency, and practicality, is suitable for various application scenarios, and provides a framework for subsequent efficiency optimization.

This invention relates to the fields of vibration control and nonlinear mechanics, and provides a programmable method for generating two-dimensional nonlinear forces. The method includes: responding to a two-dimensional nonlinear force generation request; acquiring the structure and structural parameters of a mechanical realization device; determining the trajectory of the center point of a rolling component during motion based on mechanical equilibrium relationships, and acquiring the geometric expression of the rolling component's trajectory surface; and, based on the geometric dimensions of the rolling component, performing equidistant mapping along the normal direction on the rolling component's trajectory surface, causing the rolling component to adhere to and roll along a three-dimensional guide surface, thereby generating a nonlinear force corresponding to a target nonlinear force function. This method not only generates nonlinear forces of arbitrary continuous form based on a preset target force function and supports personalized customization of nonlinear stiffness characteristics, but also generates nonlinear forces that meet target requirements in two mutually orthogonal motion directions.

The invention discloses a generation method and device of a pipe gallery model, equipment and a storage medium, and the method comprises the steps: obtaining the curvature of each path point in a path of the pipe gallery model, and dividing the path into a straight line segment and a bent segment based on the curvature distribution of each path point; under the condition that the path is a straight line segment, position and direction transformation is conducted on a preset pipe gallery model based on a spatial transformation matrix, a first geometric model corresponding to the straight line segment is obtained, and the spatial transformation matrix comprises a rotation matrix and an offset matrix; under the condition that the path is the bent section, performing equidistant scanning section generation processing on a preset pipe gallery model based on the curvature to obtain a plurality of section units; performing space mapping processing on the plurality of section units to obtain a second geometric model corresponding to the bent section; and splicing the first geometric model and the second geometric model to obtain a target pipe gallery model. Therefore, manual operation can be reduced, and the modeling efficiency and precision are remarkably improved.

The application discloses a spherical sight line guidance method considering longitude mutation of the day boundary, and comprises the following steps: establishing a nonlinear mathematical model of ship movement; based on the nonlinear mathematical model of ship movement, establishing a ship guidance strategy under a spherical coordinate system, introducing a longitude normalization operator, and utilizing spherical trigonometry to solve a spherical geometric relation between the ship and a virtual target point, so as to obtain an expected great circle course of the ship; based on the nonlinear mathematical model of ship movement, a controller is designed by using a third-order closed-loop gain shaping algorithm, so as to control the ship to track the expected great circle course; and the navigation track of the ship on a real sphere is presented by equidistant azimuth projection, and an undistorted great circle navigation track of the ship across the ocean is output. Through simulation verification, the application can make the ship cross the day boundary stably and control the ship to navigate along the great circle course, and is helpful to green, safe and autonomous navigation of the ship.

1. The name of the design product: gear cover (five equidistant curve surface). 2. The use of the design product: for hydraulic rock drill gear box transmission. 3. The design points of the design product: in shape, especially the green profile surface is five equidistant curve surface. 4. The picture or photo that can best show the design points: design 1 perspective view 1. 5. Design 1 right view is symmetrical with design 1 left view, omit design 1 right view; Design 1 bottom view is symmetrical with design 1 top view, omit design 1 bottom view. 6. Design 1 is designated as the basic design.

The invention discloses a self-adaptive calibration method and system for an electric control handle structure, a storage medium and equipment. The method comprises the following steps: acquiring calibration parameters and an actual mechanical angle of a to-be-calibrated handle; based on the obtained calibration parameters and the actual mechanical angle, adopting an equidistant interval algorithm to generate angle coordinates of a plurality of calibration points covering the effective physical stroke of the to-be-calibrated handle; and according to the angle coordinates of the calibration points, driving the to-be-calibrated handle to sequentially stop at each calibration point and acquiring an output value of the sensor in the to-be-calibrated handle at each calibration point, and establishing a mapping relation between the output value of the sensor in the to-be-calibrated handle and a standard output value of the stroke of the handle to complete calibration. The method can adapt to the individual mechanical structure difference of the handle, and consistent and accurate control performance is obtained through calibration.

The invention relates to the field of automatic control, discloses an equidistant curve path generation and smoothing method, and is used for solving the problems of complex selfing detection and loop cutting calculation, poor real-time performance, unstable agricultural machinery operation caused by sudden change of sharp points and curvature of a generated path, and the like in the prior art. And the path precision, the calculation efficiency and the hardware cost are difficult to consider at the same time. Comprising the steps of performing normal offset according to a normal vector of a base curve and a set offset distance, preliminarily generating an equidistant curve point set, quickly performing local selfing detection by using a two-dimensional grid spatial index technology, generating a non-selfing path, and performing non-selfing detection on the basis of the actual minimum turning radius constraint of the agricultural machine. And a bidirectional iterative smoothing algorithm is adopted to eliminate sharp corners and curvature abrupt changes in the path, and fitting and interpolation densification are carried out on the path. According to the method, a smooth, continuous, selfing-free and two-order derivable high-quality operation path can be efficiently generated in real time, and the stability and the operation precision of agricultural machinery path tracking are remarkably improved.

The invention discloses a path generation and post-processing simulation system and method for automatic laying of a robot type composite material, and aims to efficiently plan a laying path according to component design requirements, realize post-processing and simulation of the path by using a RoboDK platform, and realize component forming of the composite material. According to the system, an STL file is imported through a model definition module, and the geometric dimension and the structure of a to-be-laid curved surface are defined; the initial path generation module determines a reference line, a path starting point and a laying layer angle of a laying path, determines a laying direction through a distance calculation and projection method, and calculates an intersection point with a triangular patch boundary; generating a series of path points through multiple iterations, and performing path fitting by using a cubic B spline; densifying the initial path by using a parallel equidistant method to ensure that the curved surface to be laid is covered in the laying process; the generated path is output in a CSV file form, simulation verification is carried out through RoboDK, and it is ensured that the posture of the laying head is consistent with a workpiece coordinate system.

The invention provides a complex curved surface additive cladding trajectory planning method and device based on a vector field, and the method comprises the steps: defining a parameterized model of coordinates and geometric attributes of all points of a curved surface structure of a remanufacturing region, selecting a working region with z-axis projection meeting a single mapping relation based on the parameterized model, defining a boundary, discretizing the working region into points, and obtaining the complex curved surface additive cladding trajectory. Constructing a tensor field representing the optimal machining direction of each point through an intersecting line direction vector by combining geometric attributes of each point of the parameterized model, solving a saddle point according to a preset condition, determining a type, screening a separation line to divide a working area into sub-blocks through circumferential interpolation, solving a sub-block tensor field streamline, and obtaining a sub-block tensor field; and a starting trajectory is selected to generate a trajectory covering the sub-blocks in an equidistant offset mode along a preset normal, and a remanufacturing area additive cladding trajectory is obtained through integration. Geometric data basis is unified through a parameterized model, processing characteristics are accurately adapted through a tensor field, sub-block processing suitability is optimized through saddle point segmentation, and a finally generated track can reduce adverse effects of gravity on a cladding process.

An automatic wire placement thickening curved surface modeling method based on a fast marching method comprises the steps that composite material design information serves as input, a mold curved surface is voxelized, and a distance field is efficiently calculated through the fast marching method; then voxel edges are traversed, an equidistant point set is obtained through linear interpolation, and an original equidistant curved surface is established by applying a triangulation algorithm; finally, the grid segmentation algorithm is used for cutting to obtain thickened and non-thickened area curved surfaces, the two curved surfaces are sewn, and the final thickened curved surface is obtained.Compared with a traditional curved surface offset method, the method has the advantages that the problem of layering surface modeling under the condition that the thickness of a large-curvature component is increased is effectively solved, controllable high calculation precision is achieved, and the calculation process is more stable.

The invention discloses a three-axis numerical control milling machine tool path generation method and equipment based on elevation fitting and a medium, and relates to the technical field of numerical control milling machine tool path generation. The three-axis numerical control milling machine tool path generation method based on elevation fitting comprises the steps that according to a to-be-machined workpiece model and machining precision, an XY plane equidistant grid of the to-be-machined workpiece model is reconstructed; a model elevation two-dimensional matrix of the to-be-machined workpiece model is established in the Z-axis direction; a machining cutter model is constructed, and a cutting surface elevation two-dimensional matrix of the machining cutter model is established in the Z-axis direction according to the intervals of the XY plane equidistant grids; according to the boundary square frame of the to-be-machined workpiece model, a machining reference path is established; according to the model elevation two-dimensional matrix and the cutting surface elevation two-dimensional matrix, respectively calculating the fitting height of each calculation point in the processing reference path; and integrating the fitting heights of all the calculation points in the machining reference path to form a machining tool path. By adopting the method, the tool path can be quickly generated for different workpieces to be machined.

The invention discloses an open caisson construction state recognition method and system based on multi-source data, and belongs to the technical field of open caisson construction. Establishing a three-dimensional model of the construction area, dividing multiple groups of fan-shaped symmetric construction tasks by taking the center point of the top surface as a symmetric point, performing synchronous construction, and collecting elevation value and inclination data; a two-dimensional coordinate system is constructed through equal-interval sampling, and two state curves corresponding to the elevation and the gradient are generated; a task-stage alternate circulation construction mode is adopted, tasks are scheduled based on a linear mapping relation, curve slope errors are evaluated in real time, and a non-uniform state is corrected; and after all tasks reach the standard, performing weighting processing with higher recent weight in combination with historical Euclidean distance data, calculating an accumulated error reference value and a current error influence degree, and outputting an error level. According to the invention, accurate identification, dynamic correction and scientific evaluation of the construction state can be realized, the problems of incomplete traditional construction state monitoring, error evaluation lag and the like can be solved, and the construction safety and the quality stability are improved.

This invention provides a parametric modeling method and system for a full model of a side-type inlet / outlet, relating to the field of hydraulic engineering technology. The method includes: generating a coordinate transformation matrix based on the engineering parameters and number of inlets / outlets; integrating and processing the two-dimensional control points of the inlet / outlet structure's outline with unit normals to obtain a homogeneous unit normal matrix, and determining equidistant offset lines tangent to the pier head arc of the inlet / outlet structure; generating two-dimensional control points for the pier head arc based on the equidistant offset lines; stacking all two-dimensional control points of the inlet / outlet structure into a control point matrix to generate a three-dimensional model of the inlet / outlet structure; combining the engineering parameters of other structures to generate three-dimensional models of other structures, and then combining the coordinate transformation matrix to generate a full model of the side-type inlet / outlet. This invention improves the speed of parametric modeling of a full model of a side-type inlet / outlet reservoir area and enhances the stability of the modeling process.

The application discloses a power transmission line ground inclination calculation method and device based on information entropy weight, and comprises the following steps: S1, constructing a three-dimensional scene; S2, sampling equidistantly left and right along the direction of the vertical line of the overhead line of each base tower, and obtaining the original slope value of each sampling point; S3, constructing an original slope value matrix R based on the original slope value of all sampling points on the left side or the right side; S4, performing normalization processing on the original slope value matrix R, and obtaining a normalized matrix R ′ ; S5, constructing a probability matrix P; S6, calculating the entropy value of each base tower in the probability matrix P; S7, calculating the slope value weight of each sampling point according to the entropy value; S8, modifying the original slope value by using the slope value weight, and obtaining the ground inclination on the left side or the right side of the tower; S9, selecting the other side of the vertical line of the tower to the overhead line, and repeating the process described in steps S3-S8, so as to calculate the ground inclination of the tower on the other side of each base tower. The application can improve the accuracy of ground inclination calculation.

The application relates to an air mixer, which relates to the technical field of air mixing devices. The air mixer comprises a shell, an air inlet end, an air outlet end and an airflow mixing channel. The airflow mixing channel comprises two airflow guide surfaces and two end surfaces. The airflow guide surfaces are formed by stretching corresponding contour lines in the front-rear direction. The contour lines are constructed as follows: three circles with aligned centers and equidistant distribution are constructed in a three-dimensional space, the diameters of the two circles on the sides are equal and larger than the diameter of the middle circle; a line segment passing through the two side circles and tangent to the middle circle is constructed, an axis passing through all the circle centers is constructed, the line segment is rotated around the axis for one turn, and the intersection line of the obtained curved surface and the plane passing through the axis is taken as the contour line of the two airflow guide surfaces. The airflow mixing channel surrounded by the two airflow guide surfaces and the two end surfaces constructed in a specific manner can mix multiple airflows, and the uniformity and consistency of the mixed air are better.

The present invention discloses a method, device and unmanned aerial vehicle platform for positioning maritime targets based on SAR images. The method includes: performing target detection on the SAR image to estimate the target distance and the target Doppler position, and correcting the target squint angle based on the target Doppler position; determining an estimated value of the target distance position in the imaging coordinate system according to the corrected squint angle of the target and the range-Doppler equation; according to the target distance, taking the rapid estimated value of the distance position as the center, and solving the possible solution set of the target position that satisfies the target equidistant equation; solving the equal squint angle of the point set on the equidistant line in the possible solution set of the target position, and based on the corrected squint angle, solving the optimal coordinate point whose squint angle in the point set satisfies the convergence error; converting the optimal coordinate point into the target positioning coordinate in the launch coordinate system according to the rotation angle between the imaging coordinate system and the launch coordinate system. The present invention does not involve complex matrix inversion operations and iterative operations, and has a small amount of computation.

The invention provides a hole axis measuring device and a hole axis measuring method. The device comprises a sleeve, a measuring reference structure and a plurality of telescopic structures, the positioning sleeve is used for being inserted into a to-be-detected hole; the telescopic structures are arranged in the positioning sleeve in the radial direction of the positioning sleeve, can synchronously extend out of the side wall of the positioning sleeve at equal intervals in the radial direction of the positioning sleeve and abut against the side wall of the to-be-detected hole, so that the axis of the positioning sleeve coincides with the axis of the to-be-detected hole; the measurement reference structure is arranged at the top of the positioning sleeve, and the axis of the measurement reference structure coincides with the axis of the positioning sleeve; wherein the measurement reference structure is used for being scanned by a scanning device to obtain point cloud information, and the space parameters of the axis of the to-be-measured hole are determined according to the point cloud information. The method has high accessibility, the technical effect of efficiently measuring the axis of the to-be-measured hole is achieved, and the cost of hole axis measurement is greatly reduced.

The present invention relates to a tool path planning method for machining an open integral blade hub based on parameter mapping, comprising the following steps: S1: obtaining NURBS surfaces of the hub and fillet; S2: solving the curve after geodesic offset of the annular boundary; S3: splitting the geodesic offset curve to obtain curves C1 and C2; S4: discretely selecting points on curve C2 and offsetting curve C1 to obtain curve C1′; S5: drawing isoparametric lines from the discrete points as starting points to curve C1′, determining the number of tool paths based on the longest isoparametric line corresponding to the Euclidean space, selecting points at equal intervals on the isoparametric lines based on the number of tool paths, and sequentially connecting them along the hub axis to obtain multiple tool path paths; S6: extending both ends of each tool path in the flow channel to obtain a tool path extension path on the outer side of the blade; and S7: converting the above paths into tool position points. The present invention uses the annular boundary as the boundary for hub machining to relatively simplify complex geometric features, performs sampling based on chord height constraints, and ensures a smooth transition of the path.