7 results about "Central projection" patented technology

The application provides a broadband folded transmission array antenna generating an OAM beam and a design method, and relates to the electromagnetic technical field.The array antenna comprises a first super atom array, a second super atom array and an open waveguide feed source;the first super atom array is composed of a plurality of first super atom arrays, and the second super atom array is composed of a plurality of second super atom arrays;the first super atom array is arranged above the second super atom array and the central projections of the two along the vertical direction coincide;the preset second super atom at the center of the second super atom array is removed to place the open waveguide feed source, and the design of the array antenna is completed;phase compensation is provided through the first super atom array, and finally, the OAM beam is generated.The antenna profile of the broadband folded transmission array antenna is further reduced, the bandwidth is significantly improved, the efficiency is higher and more stable.

This invention relates to the field of cross-section borehole positioning technology, specifically disclosing a cross-section borehole positioning method based on central projection. By acquiring the 3D point cloud reconstruction mesh model of the cross-section and its projection pose parameters, the ray intersections and topological constraints are simultaneously calculated within a preset projection domain. An initial intersection set with occlusion determination and distortion ratio form a complete spatial mapping chain. An adaptive correction loop is constructed to relax the mesh protrusion occlusion and borehole spacing distortion in a linked manner, deriving the individualized optimal 3D borehole position distribution in reverse. This method breaks through the rigid limitations of traditional 2D templates, achieving accurate projection based on the true geometric shape of the cross-section, and providing a new high-fidelity pre-distortion guidance path for complex curved surface blasting operations.

This invention discloses a three-dimensional measurement method based on tilted fringe coding in a trinocular system. First, the distance from the phase plane to the optical axis coordinates is calculated based on a linear imaging model. Then, the vector expression passing through the optical center within the phase plane is obtained through the principle of vector superposition. This expression is then cross-multiplied with the phase line vector to obtain the phase plane normal vector. Next, the plane equation of the phase plane is established based on the phase value. Then, new constraint equations are established based on the relationship between the three-dimensional coordinate points and the phase plane. Finally, the three-dimensional coordinates of the object are calculated by combining the two constraint equations of the pinhole camera imaging model. This invention first derives the constraint equations between the three-dimensional coordinates and the phase plane based on a linear abstract model, and then solves for the three-dimensional coordinates through the constraint conditions of the pinhole camera imaging model. This significantly improves the measurement accuracy of the system when the camera's viewing angle, the central projection optical path, and the baseline direction are not the same in a trinocular system.

The utility model relates to the production of furniture, in particular to the design of a sectional, collapsible cabinet, and can be used in construction and installation work and renovation of premises for the placement and storage of various items and tools.The cabinet-constructor contains two open-type sections connected to each other, located one above the other, each of which is formed by horizontal shelves with sides and two sidewalls connected to each other, wherein in each shelf mounting holes are made for connecting the shelves with the sidewalls, wherein in the lower shelf of the first section two holes are made, and in the lower shelf of the second section - four, in addition, each sidewall of each section is a locking element made of internal, middle and external panels of different sizes, connected to each other with an overlap, wherein on the lower edge of the inner panel a central projection is made for connecting the sidewall with the holes of the lower shelf of the first section, and on the upper edge of the panel two side projections are made, created with the possibility of embracing the central projection of the inner panel and connecting the sidewall with the holes of the lower shelf of the second section, and the outer panel of the locking element is the outer side of the sidewall for each section.The technical result achieved by the claimed utility model is a reduction in labor intensity during assembly. 6 clauses, 7 figs.

The present application relates to a kind of based on manifold and far singularity wind power grid-connected system stability evaluation method, comprising: the active power and reactive power characteristics of wind turbine before and after fault are analyzed, which is equivalent to negative impedance model, wind turbine is incorporated into power system to obtain wind power grid-connected system, system motion equation is established;The local stability domain boundary BSD of system is described in two-dimensional plane, and two-dimensional local BSD is mapped to three-dimensional unit sphere by central projection transformation, and the global BSD of wind power grid-connected system is described in combination with far singularity SAI;By analyzing SAI, the position of SAI in projection space is determined, and its relationship with system parameters is established;According to the relationship between SAI and system parameters, and in combination with system BSD change, singularity invariance criterion SIC method is proposed, and in combination with stability constraint, system parameters are optimized and adjusted;The transient stability control problem that current large-scale new energy grid-connected background power system faces is solved, and the safe and stable operation of high proportion new energy grid-connected system is guaranteed.

Optical detection and mechanical light path system and its signal processing system, including shell, at least three light transmission windows are arranged on the shell, the central projection opaque light shielding column is arranged in the geometric center of the area surrounded by the light transmission window, the light shielding column is arranged along the shell axis and is located in the center of the four detection channels, the bottom of the light shielding column is arranged on the main plate, the photosensitive diode is arranged on the main plate, and the photosensitive diode is arranged correspondingly with the light transmission window.The present application has the following beneficial effects: the system can measure four-way light signals with high linearity and high resolution in a wide range of light intensity, and calculate the relative direction deviation of the light source according to the difference of the four-way signals, output the correction amount to drive the actuator to realize closed-loop alignment; at the same time, the system can also be used for other light source, light signal intensity and offset measurement application in the response wave band range.