190 results about "Tangential point" patented technology

A function approximation processing method comprises inputting and binarizing image data, extracting contour from the binarized image data, estimating tangent points in horizontal and vertical directions from the contour, and approximating contour between adjacent tangent points among the estimated tangent points with a predetermined function, thereby an input object such as a character or a figure can be processed at high speed, and outline data with high image quality can be generated with a reduced number of points.

The invention provides a non-spherical surface element shaping and processing method by using a numerical control tangent revolution method and a device thereof, and relates to an optical element processing technique. The processing method and the device can always conduct the tangent point processing for the meridional profile curve of any designed and given axisymmetrical non-spherical surface (including higher order and quadric spherical surface) and spherical surface element, so as to obtain a theoretical continuous smooth high precision surface without corrugation. The tangent point processing of the non-spherical surface is realized through the rotation of a workpiece and an abrasive wheel, and the numerical control linkage of an oscillating shaft, a workpiece shat and an abrasive axle. The tangent point processing of the spherical surface is realized through the rotation of the workpiece and the abrasive wheel, the oscillation of the oscillating shaft and the fixation of the abrasive axle at a certain distance. The processing technique has the advantages of good commonality, high precision and processing efficiency, easily ensured surface roughness and surface texture, low processing cost and the like.

The invention discloses an indoor unit of an air conditioner. The indoor unit comprises an air outlet air flue of a through-flow impeller, and an air outlet air flue wall of the through-flow impeller, wherein an air opening is formed in the air outlet air flue wall of the through-flow impeller; the upper side end and the lower side end of the air opening are perpendicular to a shaft axis of the through-flow impeller of the indoor unit; an air outlet of the indoor unit is positioned in a projection plane at the left lower side; and a clockwise included angle between a connecting line from the upper side end to the lower side end and a tangent line positive direction section of the air outlet air flue wall which takes the upper side end as a point of tangency is greater than or equal to 10 degrees but smaller than or equal to 200 degrees. The indoor unit has the advantages that air quantity of outlet air is great and outlet air is mixed air, which is cool but not cold, formed by exchange air and indoor air.

A method for the leak testing of a motor vehicle fuel tank and associated evaporative emissions control system is provided. Nitrogen, compressed air or other gases are used to pressurize the system. The time required for pressurization is used to determine the tank headspace volume. The system pressure is then monitored for 120 seconds. The pressure drop in this period is then compared with a pass-fail value cutpoint from a look-up table stored in a computer attached to the testing apparatus. A pass-fail determination is then made. The pass-fail value cutpoint is pre-determined for a specified vapor volume and estimated liquid fuel temperature, as well as time of year, so that systems with leaks larger than a specified diameter consistently fail the test, while systems with leaks smaller than this value consistently pass the test. The test pass-fail criterion is thus compensated for the conditions (tank fill level and fuel temperature, and seasonal variations in fuel volatility) experienced the actual test.

The invention discloses a hybrid air conditioner indoor unit, which comprises an indoor unit casing, a cross-flow impeller air outlet duct, and a cross-flow impeller air outlet duct wall, and is characterized in that: the cross-flow impeller air outlet duct wall is set There is an air inlet, the air inlet is perpendicular to the axis line of the cross-flow impeller of the indoor unit, and the projection line on the projection plane where the air outlet of the indoor unit is located on the lower left side, the point where it intersects with the wall of the air outlet duct is the upper tangent point of the outlet air The clockwise included angle of the positive direction section of the tangent line of the channel wall is greater than or equal to 12° to less than or equal to 198°, and an induction fan is installed on the outside of the air outlet wall of the cross-flow impeller, and the air outlet of the induction fan is connected to the induction air duct. The air outlet communicates with the air induction opening provided on the wall of the air outlet duct of the cross-flow impeller. The invention has the advantages of large air volume and speed, long shooting range, and the heat exchange air and indoor air form cool but not cold mixed air.

The invention discloses a judging method of a suspension curve model for power line sag calculation, belonging to the technical field of installation and maintenance of power equipment. The judgment method comprises the following steps of: obtaining a power line image; extracting power line image characteristics; selecting a characteristic point set of single power line for sag calculation from power line image characteristic point sets; determining two end points of the single power line in the characteristic point set of the single power line and calculating a gradient k of a straight line for connecting the two end points; calculating tangency point coordinates of the straight line which takes the k as the gradient and the single power line; calculating parameters of the suspension curve model according to the tangency point coordinates; respectively determining a catenary curve, an inclined parabola curve and a horizontal parabola curve; respectively calculating Hausdorff distances between the single power line and the catenary curve, and between the inclined parabola curve and the horizontal parabola curve; and taking a model corresponding to the curve with the minimum Hausdorff distance as the suspension curve model for meeting the requirement of the power line. The judging method disclosed by the invention improves the precision of the power line sag calculation.

The invention discloses a staged wheel type robot moving path planning method. The process that a wheel type robot is converted from a known initial full state to a known target full state is dividedinto three stages, and planning control is carried out. In the speed suppressing state, when the current speed direction of the wheel type robot is inconsistent with the current target position direction, the speed is suppressed, and the direction is adjusted, so that the wheel type robot moves in the target direction as soon as possible. In the straight line section stage, the straight line pathis tangent to a small arc path so that the wheel type robot can get close to a target tangent point as straight as possible, and meanwhile the reaching speed and the reaching posture are controlled. In the small arc section state, the radius of an arc path is limited by using the maximum centrifugal acceleration, so that the wheel type robot gets close to a target along the arc path cuts into thetarget at a desired angle. According to the method, the full-state change of the wheel type robot can be achieved, the requirement of the surrounding environment for space size is avoided, and the universality and stability are high.

The invention provides an unmanned aerial vehicle route planning algorithm based on polygonal obstacle detection. The unmanned aerial vehicle route planning algorithm mainly comprises two steps of connected graph establishment and route generation. The algorithm is based on the operation taking a point as a tangent point relative to an original polygon of an obstacle, recursion obstacle detection is performed from an original point to the tangent point, so that an initial detouring route is obtained, and convex hull operation is performed on part of the polygon to optimize a route result. An accurate global optimal route is produced. In the current unmanned aerial vehicle map testing containing carious polygonal obstacle regions, an accurate global optimal route can be produced, and a problem of route depression is solved. The algorithm is not limited to unmanned aerial vehicle route planning. Tangent point operation corresponding to specific shapes can further be arbitrarily selected according to scenes.

There is provided a screw joint for oil well tubing, excellent in seal performance and having a high maintainability.

A screw joint for oil well tubing comprising a male screw tube equipped with a seal forming portion having a convex curved surface shape on a tip end portion of the tube and a female screw tube equipped with a tapered seal portion, wherein when the convex curved surface shape comes into contact with the tapered seal portion, a contact surface pressure Pc60 equivalent to 60% of a maximum contact surface pressure Pcmax applied to a contact surface is larger than an inner pressure Pi applied to the screw joint and is smaller than a proportional limit or of a screw joint material, wherein a taper angle θs of the tapered seal portion and an angle θt of a tapered screw satisfy a formula θs≧θt, and curvature radius R of the convex curved surface shape is not smaller than 90 mm and not larger than 170 mm, wherein the angle θs is from 1.4 degree to 9.5 degree at an apex angle, wherein a length of the convex curved surface shape in an axial direction is at least not smaller than 1.5 mm backward and forward from a tangent point, and wherein a surface roughness H of the convex curved surface and the tapered seal portion is not larger than 12s.

The invention relates to a hook-thread guiding device. The high guiding device which utilizes the priority of flying distance is unable to applicable to the prior proposal of preventing the thread which is used in a low guiding device from winding together without any change. The guiding device is characterized in that a holding ring is inclined towards to the front side relative to the lateral supporting foot and the lateral supporting foot beginning from the horizontal projection width range of the holding ring has an extension length which is larger than 0 and smaller than 1.0 when viewed from the side; and when viewed from the front side, the point of contact between the outer contour line of the lateral supporting foot and the outer peripheral contour line of the holding ring is positioned at or above the position which is 80% of the maximum horizontal width range of the lower peripheral contour line of the holding ring, the point of intersection between a horizontal line passing through the lowest point of the inner peripheral contour line of the holding ring and the outer peripheral contour line of the lateral supporting foot is positioned at or at the outer side of the position which is 80% of the maximum horizontal width range of the outer peripheral contour line of the holding ring, and the outer peripheral contour line of the lateral supporting foot is positioned between the point of intersection and the point of contact or the point of intersection and the horizontal center line of the holding ring, wherein, the shorter part is positioned on or at the outer side of a vertical line passing through the point of intersection.

The invention relates to a speed control method of cam tangential point tracking grinding. The method is used for locally correcting the speed change movement of a head frame in the cam tangential point tracking grinding; a triangle function approximation method is used for replacing a curve representing the excessive change of the rotating speed of the head frame; a polynomial parameter is rationally rotated according to the maximum of the cam lift change; and a polynomial is used for interpolating and defining the rotating speed curve of the head frame. The method solves the problem of excessive rotating acceleration of the head frame in the constant line speed grinding; the rotating speed of the head frame in the excessive acceleration section is only modified; and the integer is substantially kept in the head frame speed change revolving control model based on the constant grinding point line speed; the polynomial parameter calculated by interpolating and defining the rotating speed of the head frame through the polynomial, synthetically considering the parameter obtaining accuracy and the calculating convenience and selecting the proper parameter range PL and the coefficient matrix is more rational, thus the defect of vibration corrugations on the surface of the head frame is made up; the rotating speed of the head frame is increased; and the processing efficiency is improved.

The invention relates to the technical field of earthmoving machines and discloses a pulling-rope positioning and control method, device and system applied to excavating-force test of an excavator. The method comprises the following steps of: obtaining position information of a movable arm, a bucket rod and a shoveling bucket according to a detected result of a sensor; and determining the excavating track according to the position information; determining that a tooth root of the shoveling bucket is used as a tangential point according to the excavating track and a pulling rope arranged along the tangential direction of the excavating track is fixed on the anchoring position on an anchor frame. Compared with the prior art, the technical scheme of the invention has the advantages that the errors caused by artificial visual inspection or manual measurement are greatly reduced, the anchoring position of the pulling rope on the anchor frame is more accurate and the testing accuracy of the excavating force test is greatly increased.

The invention belongs to the field of measurement technology, which relates to a video camera calibration method of small size visual measurement based on a composite plane target. The composite plane target designed by the invention comprises a black square block and a white circular speckle, the center of the white circular speckle is coincident with the center of the black square block, and the semidiameter of the white circular speckle is less than that of the black square block; the composite plane target generates no less than 12 high precision gauge points having projective invariant by utilizing the characteristic that a point and a tangent point of a circle have the projective invariant; and a nonlinear optimization method is adopted to gauge the video camera by utilizing generated world coordinate and image coordinate of the 12 gauge points. The target has simple structure and low cost, and can be suitable for gauge to the video camera of various size visual measurements.

The invention relates to a micro annular resonant cavity based vortex-controllable light transmitter. The micro annular resonant cavity based vortex-controllable light transmitter comprises a Y type light waveguide, an arc-shaped light waveguide coupler and an annular resonant cavity, wherein an Si-based junction type optical switch for controlling reflection and transmission of incident light is arranged on a branching node of the Y type light waveguide; the Y type light waveguide is connected to the arc-shaped light waveguide coupler through a first S type bent waveguide attenuator and a second S type bent waveguide attenuator; the first S type bent waveguide attenuator and the second S type bent waveguide attenuator are used for reducing the crosstalk of the Si based junction type optical switch; the arc-shaped light waveguide coupler is internally tangential to the annular resonant cavity, and a silicon-based total reflector for coupling an incident light beam from the arc-shaped light waveguide coupler into the annular resonant cavity is arranged at a tangential point. The micro annular resonant cavity based vortex-controllable light transmitter can be realized through a mature semiconductor Si process, can be used as an encoding and decoding device of a vortex light communication system, and is high in economic value.

One kind of new vortex compressor, its vortex root line based on three base circle (Three Basic Cricle, is called TBC) the theory to extend the revision line. This line inside revises involute the section E1J1, inside by flank host involute section J2E2, the connection tangential path E2E1, to revise involute section J1k1, revision great-circle segmental arc K1N1, the revision small circle segmental arc NK2, flank to revise involute section K2J2 to be composed. Revision circular arc center of a circle O1 and O2 in do not bind me first base circle tangent on. This invention has solved the PMP line turbulence root section (namely high pressure region spot) the intensity and the compression ratio mutually limits, the vortex compressor compression ratio cannot largely enhance tangential point, thus while enhances the vortex compressor compression ratio, the vortex root intensity also has the enhancement.This invention involves the vortex compressor is suitable for the air conditioning, the refrigeration, aspect and so on vacuum pump and gas loading.

The invention relates to a sheet type medium thickness identifying device which comprises a thickness shaft, a floating shaft and a sensor, wherein two ends of the thickness shaft are installed on two side boards of a frame through bearings; two ends of the floating shaft are installed on the two side boards of the frame through bearings, and the outer surface of the floating shaft contacts the outer surface of the thickness shaft in a tangential mode; and the sensor is installed on the front face of the frame and used for detecting the amplitude of the tangential point of the floating shaft and the thickness shaft. The sheet type medium thickness identifying device is characterized in that one end of the thickness shaft is fixedly connected with a first synchronous belt wheel, and the first synchronous belt wheel is connected with a first synchronous belt gear wheel through a first synchronous belt; one end of the floating shaft is fixedly connected with a second synchronous belt wheel, and the second synchronous belt wheel is connected with a second synchronous belt gear wheel through a second synchronous belt; and the first synchronous belt gear wheel is meshed with the second synchronous belt gear wheel, and the first synchronous belt gear wheel is assembled on a shaft of a driving motor. The sheet type medium thickness identifying device avoids the slipping phenomenon between the thickness shaft and the floating shaft.

The invention discloses a centreless type inner circle grinding force online measuring device. The technical scheme includes that the centreless type inner circle grinding force online measuring device comprises a magnetic disc, an end surface support, a front support and a rear support, the front support consists of a support connector successively arranged axially, a sensor base, a one-way force transducer, a positioning part, a ball and a limiting cap are sequentially connected at the front end of the support connector along the axial direction of the support connector, the structure of the rear support is identical to that of the front support, the ball is tangent to a workpiece required to be ground and processed, the direction of a line between a tangent point and the center of the ball is consistent to a force measuring direction of the one-way force transducer, mechanics characteristics during processing are converted into electric signals by the one-way force transducer, the electric signals are outputted after being filtered, and amplified electric signals are converted into digital signals to be inputted into a computer via an amplification processor and an A/D (analog/digital) converter). The centreless type inner circle grinding force online measuring device has the advantages of ingenious, simple and reasonable structure, high sensibility, fine linearity, high repeatability and measurement precision and the like, and can be mounted in a centreless type internal circular grinding machine conveniently.

The invention discloses a mesh surface curve design method based on distance constraint. The designed curve passes through a given interpolation point and is smooth (in the sense of discreteness) andstrictly located on the mesh surface. The method transforms the complex manifold constraints into distance constraints and describes them as optimization problems together with smooth constraints andinterpolation constraints. The local surface is approximated by the tangent plane, and the distance constraint is relaxed to the distance from the point to the tangent plane. Because the points on thecurve used to calculate the distance are interdependent with their corresponding tangent points, a global-local iterative strategy is adopted and Gauss- Newton idea method is used to control its convergence behavior: in the whole stage, it is relaxed into a convex optimization problem by distance approximation to solve the iterative step size; In the local phase, a robust and efficient projectionmethod is used to map the optimized curves to the surface to update the tangent points. Finally, all the relaxed polygons are mapped to the mesh surface by using the cutting plane method. Compared with the existing methods, this method has many advantages in efficiency, robustness and application range.