17 results about "Perpendicular distance" patented technology

The invention discloses an automatic discretization method for a hydroelectric nonlinear characteristic curve. The method comprises the following steps: collecting n sample points of a hydroelectric original nonlinear characteristic curve, and setting the number of required discrete points to be m; virtually connecting the head and tail points of the original nonlinear characteristic curve to form a straight line, calculating the vertical distances between all sample points on the original nonlinear characteristic curve and the straight line, and calculating the maximum distance value D0 corresponding to the maximum distance point P0; if the maximum distance value D0 is larger than the distance threshold value, the maximum distance point P0 is reserved; respectively screening out the maximum distance points in the residual sample points, and comparing the maximum distance points with a distance threshold value; if the maximum distance value D0 is smaller than or equal to the distance threshold value, all middle points are removed, and only the starting point and the ending point are reserved; and repeating the steps, and removing the point with the minimum error every time until only m discrete points remain. According to the method, the discrete points with the given number can be rapidly and automatically extracted, and the extracted discrete points can accurately represent the original nonlinear characteristic curve.

The present application relates to the technical field of oil and gas, and discloses an optimization method for a barrier-encircling trajectory of a infill well, which comprises the following steps: step 1, establishing a geometric model of a fracture risk zone; step 2, establishing a formula for the perpendicular distance from a point on a direction line to the axis of a main fracture and a formula for a collision-preventing radius; step 3, calculating the nearest point from the fracture risk zone on a starting direction line and a target direction line; step 4, optimizing the trajectory design type; step 5, setting the constraint conditions for the designed trajectory of the well to be drilled; step 6, calculating the seepage ellipsoid volume and intersection volume of the main fracture; step 7, considering the interference effect of the main fracture, calculating the daily production capacity of the block to be drilled; and step 8, calculating the development cost and income of the block to be drilled; taking the net present value as a target function, solving the optimal barrier-encircling trajectory length, and completing the optimization of the barrier-encircling trajectory of the infill well. The present application can make the optimized trajectory safely bypass the fracture risk zone and have the optimal economic benefit.

The present application provides a dimension detection method and device for detecting the width between a first side surface and a second side surface of a workpiece that are opposite and parallel to each other. The dimension detection method includes: providing a carrier platform, on which a first standard component having a first standard surface and a second standard component having a second standard surface are provided, the second standard surface being parallel to the first standard surface, and the distance between the two being the standard width of the standard workpiece; placing the workpiece between the first standard component and the second standard component, with the first standard component located on one side of the first side surface and the second standard component located on one side of the second side surface; measuring a first perpendicular distance between the first standard surface and the first side surface; measuring a second perpendicular distance between the second standard surface and the second side surface; and determining the width between the first side surface and the second side surface based on the standard width, the first perpendicular distance, and the second perpendicular distance. The above-mentioned dimension detection method eliminates the influence of inaccurate positioning and temperature changes on the workpiece size, thereby improving the detection accuracy of the workpiece.

On this drilling device, it can be adjusted to the corresponding horizontal and vertical position dimensions for drilling and then fixed. The drilling position dimensions are determined by the relative horizontal and vertical position dimensions represented by the perpendicular distances from the center point of the starting point hole template bushing to the right-angle elbow surface of the telescopic scale and the reference backing surface respectively; the position dimensions of the entire adjusted and fixed drilling device are obtained by leaning and pressing on the corresponding adjacent edges of the processing board surface to get the drilling position, and then the position dimensions on the processing board are clamped and locked with a large pliers before drilling; the process of drawing marking lines is omitted. During the drilling process, the movement and deviation of the drilling position dimensions are prevented. Due to the combined characteristics of the clamped and fixed drilling device position dimensions and the guiding length of the bushing, the drill bit is first inserted into the guiding length of the bushing and then drilling is carried out. By using the drilling device, the process of drawing marking lines is omitted and the requirement for the operation technical difficulty is reduced.

This invention discloses a method for measuring perpendicularity during the machining of high-precision tapered holes. A standard mandrel with the same taper as the high-precision tapered hole is inserted into the hole. Two planes with a perpendicular distance H and parallel to the perpendicularity measurement reference are selected on the cylindrical surface of the standard mandrel. The coordinate information of the contour lines on the standard mandrel corresponding to the two planes is obtained through a machine tool probe, and then the center coordinate point is calculated. The perpendicularity is then measured. This invention can detect the perpendicularity of the hole to be machined in real time. The measurement principle is simple, the operation is convenient, and it is easy to implement and promote.

A method for measuring a feature near the edge of an object comprising receiving image data characterizing the object, identifying an edge of the object, identifying a point on the perimeter of the feature at a position opposite the edge of the object, determining a reference plane, determining a three-dimensional reference line on the reference plane associated with the edge of the object, determining a three-dimensional measurement point on the reference plane based on the point on the perimeter of the feature, and determining the perpendicular distance from the measurement point to the reference line.

The invention belongs to the technical field of point cloud recognition, and particularly relates to a pressure vessel end socket welding method for selecting a welding point based on a moving average slope, which comprises the following steps: S1, creating a cylindrical 3D ROI (Region of Interest) area; extracting original point clouds in the ROI as ROI point clouds; s2, creating a section coplanar with the central axis of the cylinder, splitting the point cloud of the ROI, and taking points with the vertical distance to the section smaller than a preset distance as section points to obtain a section point set; s3, segmenting the section point set at a central point, and dividing the section point set into two sections of point clouds; s4, for each section of point cloud obtained in the S3, identifying whether an abnormal point exists or not according to a preset identification method; and S5, rotating the section around the central axis according to a preset rotation angle, and returning to S2 to execute subsequent operation until a preset stop condition is met. According to the method, the inner wall interference and the real edge can be distinguished, welding point selection is optimized in combination with the local geometric trend, and high-precision and high-robustness seal head connecting pipe welding positioning is achieved.

The invention belongs to the technical field of measurement, and particularly relates to a steel pipe straightness detection method, system and equipment. The objective of the invention is to solve the problem of low detection efficiency and detection accuracy of steel pipe straightness. The method comprises the following steps: setting a plurality of detection positions in the length direction of a steel pipe, synchronously collecting contour data of the steel pipe, and converting the contour data into contour point clouds under a unified coordinate system; combining all contour point clouds at the same detection position to form a complete section point cloud; solving the circle center coordinate of each section; based on a preset axial distance, axial coordinate values are distributed for the circle center of each section, and a three-dimensional center point sequence of the steel pipe is constructed; and calculating the vertical distance from the center of the middle section to a reference axis by taking a connecting line of the centers of the head and tail sections as the reference axis to determine the straightness of the steel pipe. According to the invention, the detection time of a single steel pipe is shortened, the detection efficiency is improved, the dependence on the manual operation speed is eliminated, and the objectivity and accuracy of the straightness detection result are improved.

The invention discloses a blade geometric quantity measuring method, which belongs to a blade detection method and comprises the following steps of: planning a to-be-measured point of a blade, extracting geometric quantity dimensions of a chord line and a chord line angle and extracting the maximum thickness of a blade section. According to the method for measuring the geometric quantity of the blade, the to-be-measured point of the blade can be planned, the geometric quantity dimensions of the chord line and the chord line angle and the maximum thickness of the section of the blade can be extracted, the planning of the to-be-measured point of the blade is based on a curve segmentation and vertical distance method, and fitting precision and measurement efficiency requirements are comprehensively considered; the algorithm related to extraction of the chord line, the chord line angle and the maximum thickness of the blade section is relatively simple, the extraction precision is relatively high, writing is easy, the operation speed is high, and the precision and efficiency of geometric quantity measurement of the blade are improved.

The invention provides a method for determining a finger joint instantaneous center curve and simplifying application based on a medical image, and the method comprises the following steps: A, carrying out the medical image collection and image processing of a large number of subjects, and obtaining a finger joint instantaneous center track through a mathematical model; b, performing fitting processing on the geometrical characteristics of the finger form, including a finger contour line, a center line and joint wrinkles, and obtaining a linear equation of the finger form; c, in the same coordinate system, making a straight line relation between the instantaneous center coordinate and the geometric form straight line equation; comprising a vertical distance from an instantaneous center point to a single finger form straight line, a vertical distance from the instantaneous center point to a plurality of finger form straight lines, auxiliary lines between the finger form straight lines, geometric connection between the finger form straight lines and the instantaneous center point, and connection between angles between the finger form straight lines and coordinates of equal instantaneous center points; and D, converting the geometric relation between the instantaneous center point and the finger form straight line into numerical relation, inputting the numerical relation into a deep learning model, and establishing mathematical mapping.

The application discloses a hot-rolled strip steel local high point detection method, device, equipment and medium, and belongs to the metallurgical technical field.The method comprises the following steps: acquiring the positions and thicknesses of each detection point on a strip steel cross section; determining the perpendicular distances from a target detection point to each target straight line according to the positions and thicknesses of each first detection point, each second detection point and the target detection point, the target straight line being the line connecting the first detection point and the second detection point, the target detection point being any detection point among all the detection points, the first detection point being a detection point between the target detection point and a third detection point, the second detection point being a detection point between the target detection point and a fourth detection point, and the third detection point and the fourth detection point being located on the two sides of the target detection point; and determining the thickness state of the target detection point according to all the perpendicular distances, wherein the thickness state comprises a local high point state and a flat state.The method can automatically detect which detection points among all the detection points are local high points.

The present invention relates to a system and a method for generating a real-time topographic map with respect to an excavated face of a construction site with a real-time location of a bucket, and calculating a real-time perpendicular distance between the bucket and the excavated face based on the topographic map. Moreover, by comparing a topographic grid point assigning a real-time location of the bucket on the grid point generated to be fitted to predetermined resolution and a real-time location of a bucket, a real-time perpendicular distance of the bucket is calculated and provided to conveniently prevent pitching when drilling a deep place in which a clear view is hardly secured with respect to a drilling surface by an excavator driver.

A filament for an oral care implement has a longitudinal axis and a multi-edged cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis, the multi-edged cross-sectional area having at least 18 projections and at least 18 grooves, the projections and grooves being arranged in an alternating manner. Each projection has a peak, and each groove has a bottom formed by neighboring and converging projections. Each peak has a height, the height being defined as a perpendicular distance measured from the peak of the projection to a tangent between to neighboring bottoms. Each groove has a depth, the depth being defined as a perpendicular distance measured from the bottom of the groove to a tangent between two neighboring peaks. A ratio of the peak height to the depth of the groove is from about 1 to about 2, preferably about 1.5

The present invention relates to a point cloud calibration and splicing method based on a five-axis measurement platform. The method comprises the following steps: calibrating the rotation axis of a rotating platform and calculating the axis coordinates of the rotating platform axis in the measuring machine coordinate system; calibrating the rotation axis of a surface laser sensor and calculating the perpendicular distance between the axis and the XOY plane of the sensor coordinate system; and, based on the axis coordinates and perpendicular distance, uniformly converting the collected raw point clouds of all workpiece sub-regions from the sensor coordinate system to the measuring machine coordinate system to complete the splicing. This point cloud calibration and splicing method based on a five-axis measurement platform aims to solve the problem of achieving calibration between the measuring platform coordinate system and the sensor coordinate system, and rapidly splicing point clouds.

The invention is characterized in that the transformation element (30) has the shape of a plate with a tetragonal base with a central hole defined by an inner cylindrical surface (33), with linear guide surfaces (34a) lateral to the vertices of the teragonal base, on which there are cylindrical rolling elements (31) whose diameter is greater than the length of the guide track (34a), the guide tracks (34a) end at the profile parts (37). The ratio of the distance w of the linear guiding surfaces (34a) to the double of diameter of the rolling elements (31) is less than 1. The transformation member (30) of the invention is also characterized by the fact that the shortest distance (b) of the opposing profile parts (37) is less than or equal to the perpendicular distance of the paths (34a). The rolling bodies (31) of the invention have a central circular hole (32) for cylindrical pins (36), the diameter of the hole (32) and the diameter of the pin (36) being (approximately) the same. On at least one of the flanges (20), (20 ́) and the adjacent wheel (40), there are longitudinal recesses (26) between the guide tracks (34a) in which the pins (36) are guided and which are positioned in such a way that the position creep of the bodies (31) oscillating linearly on the guide paths (34a) is limited at the ends of the depressions (26). The transformation term (30) according to the invention is also characterized by the fact that the sides of the tetragon (38) are straight or arcuate.

The application relates to the technical field of geotechnical mechanics testing, in particular to a non-contact measurement method for a circular tunnel surrounding rock structure surface and related equipment, establishes a measurement control point and a measurement station position, establishes a local measurement coordinate system, determines feature points of a structure surface trace and coordinates of the feature points, converts the local coordinates into global coordinates by correcting a hole axis azimuth angle, constructs a corrected local coordinate system, obtains new coordinates of the feature points, projects the new coordinates to a tunnel cross section, calculates a perpendicular distance from the feature points to a circumferential line, optimizes the feature points according to the perpendicular distance to meet constraint conditions, determines a structure surface trace distribution map and occurrence of the feature points, and realizes accurate measurement and analysis of the tunnel surrounding rock structure surface. The application can obtain actual circular tunnel surrounding rock structure surface trace and occurrence information by reducing field measurement workload.

The invention discloses a vortex generator, a shape design method thereof and a blade, and the vortex generator comprises a base which is provided with a top surface and a bottom surface which are oppositely arranged in a first direction; the fins are arranged on the top face and protrude out of the top face in the first direction, in the first direction, the outer contour of the cross section of any position of each fin comprises a trailing edge line and streamline curves arranged in pairs, and the streamline curves arranged in pairs are symmetrically distributed relative to the first axis in the second direction. Each streamline curve comprises a first curve section and a second curve section which are sequentially arranged in the third direction, the first curve section is an arc section, and in the third direction, the vertical distance from the second curve section to the first axis tends to be increased firstly and then decreased. By the adoption of the vortex generator, the purposes of effectively reducing the resistance coefficient and increasing the vortex strength can be achieved while the structural strength of the vortex generator is guaranteed, and therefore boundary layer separation is effectively delayed.