466 results about "Great circle" patented technology

A ball-and-socket joint with integrated angle sensor for a motor vehicle, especially for the chassis of the motor vehicle is created. The ball-and-socket joint has a ball-and-socket joint housing (6) provided with a joint opening (7), a ball pivot (1) having a joint ball (2) and a pin (3), which is mounted, with its joint ball (2), rotatably and pivotably in a hollow-ball-shaped bearing surface in the ball-and-socket joint housing (6), and projects, with its pin (3), through the joint opening (7) out of the ball-and-socket joint housing (6). A two-pole field transducer (5) is provided at the end of the joint ball (2) facing away from the pin (3). The poles of the field transducer (5) are arranged on the ball surface. In this case, at least two field sensors (13) are arranged at a distance from one another with respect to the meridian plane defined by the large circle on the hollow-ball-shaped bearing surface running at right angles to the bearing longitudinal axis in the area or on the ball-and-socket joint housing (6) facing away from the joint opening, and interact with the field produced by the field transducer (5).

A pair of spherical gears connects the intersecting shafts of a CV-joint. One gear has internal teeth, and the other has external teeth. The gear design is based on pitch circles that are great circles on theoretical pitch spheres that are concentric and have identical radii. The gear teeth are preferably straight-sided. Individual smaller construction spheres are arranged in a circle so that the points of tangency between successive smaller spheres are all positioned on the circumference of the identical pitch circles of the gears and are all also positioned on the respective pitch circles of each successive smaller construction sphere. The straight-sided tooth faces of the teeth of the internal gear are preferably cone shaped. The preferred embodiment uses six teeth on each gear, and the gears, while rotating at high speeds under load, can intersect throughout a continuous maximum range of 60° or more.

The present invention provides a method for arranging dimples on a golf ball surface in which the dimples are arranged in a pattern derived from at least one irregular domain generated from a regular or non-regular polyhedron. The method includes choosing control points of a polyhedron, generating an irregular domain based on those control points, packing the irregular domain with dimples, and tessellating the irregular domain to cover the surface of the golf ball. The control points include the center of a polyhedral face, a vertex of the polyhedron, a midpoint or other point on an edge of the polyhedron and others. The method ensures that the symmetry of the underlying polyhedron is preserved while minimizing or eliminating great circles due to parting lines.

The invention discloses an access method in a same frequency network with N frequency points, which comprises the following steps: in each district, prearranging a large circle covered carrier wave which continuously covers a whole network and a small circle covered carrier wave which only covers a central area of the district, wherein the large circle covered carrier waves of adjacent districts are different, and each large circle covered carrier wave comprises a main carrier wave of the district; in the terminal access process, when a base station in the district where the terminal is positioned confirms that the terminal is positioned in the central area of the district, accessing the terminal into the small circle covered carrier wave of the district; and when the base station confirmsthat the terminal is positioned in a marginal area of the district, accessing the terminal into the large circle covered carrier wave of the district. By applying the access method, same frequency interference at district boundaries can be avoided.

The present invention provides a method for arranging dimples on a golf ball surface in which the dimples are arranged in a pattern derived from at least one irregular domain generated from a regular or non-regular polyhedron. The method includes choosing control points of a polyhedron, generating an irregular domain based on those control points, packing the irregular domain with dimples, and tessellating the irregular domain to cover the surface of the golf ball. The control points include the center of a polyhedral face, a vertex of the polyhedron, a midpoint or other point on an edge of the polyhedron and others. The method ensures that the symmetry of the underlying polyhedron is preserved while minimizing or eliminating great circles due to parting lines.

The invention discloses a fast processing method of a laser vision image of steel rail wear, comprising the following steps of: projecting more than two optical planes which are mutually parallel and vertical to the axial direction of the steel rail, selecting one optical plane and projecting the optical plane to images of the rail waist of the steel rail and an optical strip of the rail head, calculating a coordinate of the center of the optical strip at the rail waist in a coordinate system of the optical plane, and calculating circle center coordinates of large circles and small circles of the rail waist in the coordinate system of the optical plane; calculating a transformation matrix between the coordinate system of the selected optical plane and a profile coordinate system of the section of the standard steel rail; respectively determining intersection points of line segment and the optical strip of the rail head between the constraint points of vertical wear and the constraint points of horizontal wear in the image plane of a video sensor; carrying out inverse transformation on the image coordinate of the vertical wear point and horizontal wear point to the profile coordinate system of the section of the standard steel rail, and determining the coordinate of the vertical wear point and horizontal wear point of the steel rail in the profile coordinate system of the section of the standard steel rail, and the vertical distance and horizontal distance between the vertical wear point and the horizontal wear point of the steel rail and the profile of the standard steel rail, namely the wear value of the measured steel rail. The detection efficiency of the wear value of the steel rail is improved greatly.

The invention provides a system for testing the aerial performance of a wireless USB modem and comprises a darkroom, a rotating floor that is arranged in the darkroom, a testing antenna and a computer, wherein, the wireless USB modem is connected with the started computer through a USB wire, and the computer is fixed in the top end of a rotating shaft that is vertical to a plane of the rotating floor; the USB modem is arranged in a proper position of the darkroom for implementing the great circle test of the USB modem. The invention further provides a method for testing the aerial performance of the wireless USB modem. Therefore, the invention can better utilize an OTA testing darkroom of existing cellphones, the hardware system of the rotating floor and the software system, and a three-dimensional directivity diagram and TRP and TIS data which are acquired from the testing can reflect the radiation and receiving characteristics of the antenna.

A tubular skylight having an improved dome improving the efficiency of the skylight. The dome includes an integral prism in a portion of its outer surface to reflect light downwardly through the skylight. The dome is hemispherical, and the prism includes a plurality of grooves extending along great circles that pass through the apex of the dome. The prism covers only an angular segment of the hemispherical dome; and the grooves stop short of the apex of the dome.

The invention discloses a method and a system for correcting the circle center deviation of round mark points during camera projection transformation. The method for correcting comprises the following steps of: step A, arranging the round mark points which have colors different with a background and have concentric ring shapes; step B, shooting the round mark points by utilizing a camera, carrying out sub-pixel positioning on the edges of the shot image of the round mark points, and fitting a large ellipse and a small ellipse according to the positioned sub-pixel edges; and step C, according to the radiuses r1 and r2 of a large circle and a small circle which are concentric and are obtained in the step A and the center coordinates C1 (muB1, vB1) and C2 (muB2, vB2) of the large ellipse and the small ellipse which are obtained in the step B, correcting the image coordinates of the practical projective points of the circle centers of the round mark points on an image plane after the camera projection transformation. A concentric ring method is adopted, and the linear combination of the large ellipse and the small ellipse is ingeniously utilized to correct the real positions of the circle centers of the manual round mark points on the image plane.

A structural system comprising the symmetrical interpenetration of an icosahedron and dodecahedron, further articulated to form a rhombic triacontahedron with each rhombus subdivided by two diagonals at its midpoint. The vertices of the original icosahedron and dodecahedron, and the midpoints of the rhombi, are projected such that a single circumscribed sphere would touch or nearly touch all three sets of resulting vertices. This geometry may used to create a hemispheric geodesic dome. Alternatively, this dome may be subdivided along the hemisphere's great circle segments into two half domes or four quarter domes. Rectangular structural elements may be inserted between the half or quarter domes to increase dome area without increasing dome height and to provide other advantages. The basic triangular components of the disclosed structure may be cut with minimal waste from conventional rectangular construction material such as Structural Insulated Panels. These basic triangular components may be connected with a living hinge.

A method and system for converting privacy zone corner points in a still image to PTZ coordinates using the equations for distance along the great circles of a sphere, where the sphere is defined along the pan-tilt axes of a PTZ camera with radius equal to the focal length of the image. The method includes receiving planar coordinate data defining a plurality of privacy zone corner points, the planar coordinate data taken from a still image, converting each privacy zone corner point to corresponding spherical coordinates, converting each of the corresponding spherical coordinates to corresponding PTZ coordinates, and storing the corresponding PTZ coordinates in a storage device. The stored PTZ coordinates may then be transmitted to a computer monitor. The motor of the PTZ camera moves the camera according to the PTZ coordinates until the privacy zone corner points appear at the substantial center of the monitor screen.

The invention discloses a tooth cutting method for a bevel gear with spherical involute toothed archimedes spiral teeth and a machine tool thereof. The method overcomes the disadvantages that the current tooth cutting method forms principle errors, has complex revision calculation, trial cutting and adjustment of a machine tool, and the like. The tooth cutting method adopts a machine tool with double stations and a single cutter head, which can continuously tooth dividing. When teeth are cut, the I station at one side of the cutter head completes the rough cutting of tooth sockets and the finishing cutting of the concave tooth surfaces of teeth; then the II station at the other side of the cutter head completes the finishing cutting of the convex tooth surfaces of the teeth, each cutter tooth straight edge on a cutting tooth cutter head envelopes and cuts out the side surfaces of the teeth, the circular arc edge of tooth top cuts out the tooth root, and the rough cutting concave edge cuts off the margins of the tooth sockets; and when the teeth are cut, a cutter head shaft and the tooth blank shaft are in a spatial cross position, the rotating end surface of the cutter head is perpendicular to the tangent plane of the gear blank base cone, the cutter head, the gear blank and the big circular plane of an imaginary spherical surface rotate in an uniform speed, the cutter head is in the rotary feed when cutting the teeth, and the continuous hobbling base cone toothed portion is the spiral bevel gear of Archimedes. The invention provides a machine tool, a cutter head and a cutter tooth for realizing the tooth cutting method.

The invention provides a method for acquiring the position of image projection point of a centre of a circular mark point used in orientation of video camera. The characters include that: the method for setting the circular mark point is: concentric circles are set, and the concentric circles consists of a big circle and a small circle; an inscribed circle which is inscribed in the small circle is arranged in the inner part of the small circle in the concentric circles, and the diameter of the inscribed circle is equal to the radius of the small circle in the concentric circles; the method for acquiring the position of image projection point of the centre of circular mark point is: image is acquired, filtering, division of threshold value, edge checking, profile extraction and ellipse fitting of least square method are carried out on the image for acquiring the line connecting of the centre of the ellipse in the image that the big circular and the small circular in the concentric circles are corresponding to, the line connecting and the edge of the ellipse in the image that the inscribed circle of the small circle in the concentric circles corresponds to intersects at two points, and the point of intersection near to the centre point of the ellipse in the image which the big circle of the concentric circles is corresponding to is the position of the projection point of the centre of the big circle and the small circle in the concentric circles.

The invention discloses a free forging method of a forge piece of rotary arms, which comprises the steps of: firstly, making a forming die and an upsetting punch; secondly, first forging: heating a steel ingot, tapping and pressing a clamp handle, and removing the clamp handle to obtain desirable blank material of the forge piece; thirdly, second forging: putting a rotary upsetting table on a movable work table, putting the forming die on the rotary upsetting table, putting the desirable blank material of the forge piece into the forming die, putting the upsetting punch at the upper end face of one large circle of the blank material of the forge piece, and forging; and horizontally moving the movable work table to achieve the aim of performing; fourthly, third forging: installing a flat anvil on the end face of the large circle of the blank material of the forge piece, further widening, rolling to be a circle, and furnace filling; and fifthly, fourth forging: overturning the upper surface and the lower surface of the blank material of the forge piece, flatting the other large circle of the blank material of the forge piece, punching, rolling to be a circle, and finishing with many times to obtain a finished product of the forge piece of the rotary arms. The method has simple steps, and guarantees the forging quality.

A modulation method for optical communication comprises the step of generating an optical signal modulated between a plurality of different states of polarization and between different phase states. The plurality of states of polarization comprises first states of polarization (SOP1-4). The first states of polarization (SOP1-4) define a single great circle (10) on the Poincare sphere. The method is characterized in that the plurality of states of polarization further comprise one or more second states of polarization (SOP5-6) located outside the great circle (10). Such additional second statesof polarization increase the symbol alphabet.

The invention belongs to a cutting machine for cutting circles on arc faces and particularly relates to a portable saddle-shaped cutting machine. The portable saddle-shaped cutting machine comprises a fixed base, a great circle cutting mechanism and a small circle cutting mechanism; the great circle mechanism comprises a great circle cutting spindle arranged on the upper portion of the fixed base, and a lifting sliding table is arranged on the great circle cutting spindle and connected with a lifting arm; the small circle cutting mechanism is arranged at the end, away from the lifting sliding table, of the lifting arm and comprises a telescoping mechanism connected with the lifting arm, and a cutting mouth assembly is arranged at the bottom of a rotary air distribution assembly which is arranged at the end, away from the lifting arm, of the telescoping mechanism. The portable saddle-shaped cutting machine is a perforating machine widely applicable to national defense industry, shipbuilding and ocean engineering, pressure vessels for chemical industry, nuclear power plant equipment and utility boiler industry, and is capable of not only perforating on cylindrical shells and oval shells but also cutting projection round holes on other types of complex spatial curved surfaces and cutting variable-angle double grooves.

A method of determining conflicting flight paths between a first and a second airborne vehicle is provided, wherein each vehicle comprises an aircraft-to-aircraft navigational communication system having a navigational device. First, a position and a velocity vector are determined for each of the airborne vehicles. A cylindrical volume is then defined about the first airborne vehicle. A separation distance is then determined between the vehicles at a selected time and using a great circle earth model. An accuracy factor is thereafter determined for the position of each vehicle. The separation distance is then modified by the accuracy factor. A determination is then made as to whether the modified separation distance is within the cylindrical volume about the first airborne vehicle during a time range to thereby determine whether conflicting flight paths exist between the vehicles. An associated system and computer software program product are also provided.

Motion compensation for coherent combination of pulses facilitates a SAR image of a scene on earth's surface. A great circle (406) is centered with respect to the earth's center, The great circle (406) has an axis (412) perpendicular to a first plane. Axis (412) passes through the earth's center. The first plane contains great circle (406) and includes the earth's center. Great circle (406) has a first center defined by an intersection of the first plane and axis (412). The scene has one or more radar scatterers and is located on a surface (402). The radar system is mounted on a moving platform (400) moving with a component of motion in a direction along great circle (406). The radar comprises a radar receiver for digitizing the radar returns having a phase from scatterers on surface (402), and a computer for focusing the phase of said radar returns from the scatterers on surface (402). The surface (402) is located on a local scene centerline circle (408), the local scene centerline circle (408) defining a second plane. This second plane is parallel to the first plane. The local scene centerline circle (408) is centered on the axis at a second center, where the second center is displaced with respect to the first center along the axis by a distance (414). The phase of the radar returns received from the scene is compensated for the motion of the moving platform (400) using a cylindrical coordinate system referenced with respect to the second center to yield a SAR image.