7 results about "Ellipse" patented technology

The compressor blades of an aircraft engine are, in at least one natural-vibration critical area, designed such that at the blade leading edge (6), the leading edge shock wave (14) attaches to the leading edge (6), as a result of which a laminar boundary layer flow (7) on the suction side (13) quickly transitions into a turbulent boundary layer flow (9) which is kept constant and prevented from re-lamination by the further, continuous curvature of the suction side. Therefore, the transition, whose periodic movement is also suppressed, cannot communicate with a suction-side compression shock (10), preventing the compression shock from augmenting the natural vibrations of the blade occurring under certain flight conditions. The blade leading edge can, for example, be designed as an ellipse with a semi-axis ratio equal to or smaller than 1:4.

The invention relates to a method of quickly beautifying a facial image in conjunction with skin roughness; the method comprises: converting the facial image from RGB space into YCbCr chrominance space, and extracting brightness component, blue chrominance component and red chrominance component graphs; solving an ellipse center and long and short radiuses of a skin color elliptical model in conjunction with blue chrominance component and red chrominance component histograms, and calculating a skin color soft threshold graph according to skin color similarity; processing brightness component to obtain a local skin color variance graph in conjunction with the skin color soft threshold graph, using the local skin color variance graph as a smoothing parameter and smoothing brightness component graph to perform Gaussian blurring on the soothing brightness component graph, and linearly mixing to obtain a smooth graph in conjunction with the brightness component graph; using the skin color soft threshold graph as a weight to fuse the brightness component graph and a smooth graph to obtain a fused graph, and subjecting the fused graph to curve whitening to obtain a finally beautified graph. The method uses skin color similarity and roughness to remove skin color defects while retaining the skin nature, and has significant overall beautifying effect.

The invention relates to a screw rotor end face tooth type for a double-screw pump and a twin screw compressor. The screw rotor end face tooth type is formed by multiple miscellaneous tooth curves, wherein each tooth curve comprises a cycloid curve, a circular arc, a circular arc envelope curve, an ellipse arc, an ellipse arc envelope curve and the like. The screw rotor end face tooth type has the technical characteristics that: the tooth curve on a screw rotor end face is formed by five sections of tooth curves which comprise a cycloid curve tooth curve abc, a circular arc tooth curve cde located on a dedendum circle, a circular arc tooth curve ija located on an addendum circle, an ellipse arc tooth curve efg, and an ellipse arc envelope curve tooth curve ghi by taking the ellipse arc tooth curve efg as a baseline; and a section of circular arc or two sections of circular arcs can be simultaneously added on the two sides of the ellipse arc respectively to form four different combination schemes. The screw rotor end face tooth type provided by the invention can realize strict (complete) seal, and a contact line generated through meshing is shorter; and the double-screw pump or the twin screw compressor produced by applying the invention has the advantages of high volumetric efficiency, high medium pressure capable of being delivered, and the like.

The invention relates to a lens for LED (light emitting diode) outdoor lamps, comprising a long circular flat base, an elliptical special lens and an internal concave, wherein the elliptical special lens is located on the upper surface of the base and is integrated with the base; the external surface of the lens is symmetrical with a horizontal X axis and a horizontal Y axis, wherein the horizontal X axis and the horizontal Y axis are vertically arranged at the bottom center of the base; and the lens is further symmetrical with a vertical Z axis which is arranged at the bottom center of the base; the vertical Z axis is vertical to the bottom surface of the base; the part of which the upper surface of the base is larger than the bottom of the external surface of the base is an annular press ring bearing side; the internal concave is a columnar internal concave which is located in the bottom center of the base, concaves towards the internal part of the lens and is provided with an internal inclined surface; the internal inclined surface is located at two columnar ends of the internal concave; the internal inclined surface inclines towards the center of the external surface of the lens and forms an included angle of 2-5 degrees with the vertical plane vertical to the bottom surface; furthermore, the internal inclined surface is simultaneously symmetrical with the horizontal X axis, the horizontal Y axis and the vertical Z axis; and a reflecting film is covered on the bottom surface so that the main strong light of an LED light source is completely reflected on the bottom and then ejected out after a second treatment to form a batwing light matching curve.

The invention relates to a lamp which comprises at least one light-emitting element with an optical axis and a reflecting shade covering the at least one light-emitting element, wherein the reflecting shade comprises at least one reflecting unit corresponding to the at least one light-emitting element, the reflecting unit has a reflecting surface, the reflecting surface comprises two intersected curved surfaces, each curved surface has an axial line, and the axial lines of the two curved surfaces intersect. For the distance between any two points on an intersecting line formed by the two curved surfaces and a plane perpendicular to the optical axis of the corresponding light-emitting element, the distance between two intersecting points formed by the intersecting line of the two curved surfaces and the plane is the maximum. Compared with the prior art, a light reflected by the reflecting shade of the lamp is projected to an almost elliptical region, and the light reflected by the reflecting shade of the lamp projects a wider light beam on the major axis of the ellipse to obtain a greater illuminating effect in the illuminated region and projects a narrower light beam on the minor axis of the ellipse to obtain an illuminating effect with greater illuminating intensity and uniform light distribution. The invention also provides a reflecting shade.