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13 results about "Central projection" patented technology
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Antenna and electronic equipment
PendingCN121149665AAntenna supports/mountingsRadiating elements structural formsDielectric substrateCentral projection
The invention provides an antenna and electronic equipment, and belongs to the technical field of antennas. The antenna comprises a dielectric substrate, and a first conductive layer and a second conductive layer which are arranged on the two sides of the dielectric substrate in the thickness direction of the dielectric substrate; each of the first conductive layer and the second conductive layer comprises a feeder line, a first radiation structure and a second radiation structure which are arranged at two opposite ends in the extension direction of the feeder line, and a third radiation structure and a fourth radiation structure which are respectively arranged at two sides in the extension direction of the feeder line; the first radiation structure and the second radiation structure are symmetrically arranged by taking the midperpendicular of the feeder line as a symmetry axis, and are electrically connected with the feeder line through a switch structure respectively; the third radiation structure and the fourth radiation structure are rotationally symmetrical by taking the midpoint of the feeder line as a rotation center, and are electrically connected with the feeder line through a connecting structure respectively; the extension directions of the feeder line of the first conductive layer and the feeder line of the second conductive layer intersect, and orthographic projections of the centers of the two layers on the dielectric substrate coincide.
Owner:BEIJING BOE TECH DEV CO LTD +1
A broadband folded transmission array antenna generating OAM beams and a design method
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.
Owner:CHINA SHIP DEV & DESIGN CENT
A central projection type pipeline intersecting line marking device
The application relates to a central projection type pipeline intersecting line marking device which effectively solves the problems of poor universality, inconvenience in use and unsuitability for large-diameter pipelines of the intersecting line marking equipment; the technical solution comprises a head and a supporting rod, the head comprises a hollow shell, a light-transmitting cover is fixed to the right end of the shell, the light-transmitting cover is made of reversible color-changing material, a first point light source is arranged in the shell, a horizontal mounting rod is arranged on the concave side of the light-transmitting cover and is provided with a parallel light beam projection unit, the parallel light beam projection unit can project parallel light beams on the light-transmitting cover, and the color or light transmittance of the light-transmitting cover in the projection area of the parallel light beams will change; the application uses the equal-ratio amplification principle of the central projection of the first point light source to simulate the equal-ratio amplification projection of the intersecting line on the target pipeline for display and identification, the purpose of representing the intersecting line of the large-diameter pipeline by the small device is achieved, the stability is good, the device is convenient to use, and the intersecting line can be completely displayed.
Owner:SHUIFA PLANNING & DESIGN CO LTD +1
A cross-section borehole positioning method based on central projection
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.
Owner:HUNAN LIANSHAO CONSTR ENG GRP
Cylinder structure, compressor pump body and compressor
The utility model belongs to the technical field of compressors, and discloses an air cylinder structure, a compressor pump body and a compressor. A cylinder cavity is formed in the center of the cylinder body; an air suction opening is formed in the air cylinder wall of the air cylinder body and penetrates through the air cylinder wall of the air cylinder body in the radial direction. The air cylinder body is further provided with a flow expanding hole, and the central projection of the flow expanding hole is located on the central axis of the air suction port. One end of the flow expanding hole is communicated with the air suction port, and the other end of the flow expanding hole is communicated with the axial end face of the air cylinder body. The flow expanding hole is communicated with the air suction port, flow expanding is achieved when air flows through the flow expanding hole by expanding the airflow channel, the effect of effectively reducing airflow resistance and flow velocity is achieved, the purpose of noise reduction is achieved, and the stability and reliability of the air cylinder are improved.
Owner:XIAN QINGAN REFRIGERATION EQUIP CO LTD
A method for three-dimensional measurement based on three-ocular system under inclined stripe coding
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.
Owner:NANJING UNIV OF TECH INTELLIGENT COMPUTING IMAGING RES INST CO LTD
Construction set
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.
Owner:ПАЛАМАРЧУК СЕРГЕЙ ВАСИЛЬЕВИЧ
Wind power grid-connected system stability evaluation method based on manifold and infinite singular point
ActiveCN121308200ASingle network parallel feeding arrangementsWind energy generationTransient stateNew energy
The invention relates to a manifold and infinite singular point-based wind power grid-connected system stability evaluation method, which comprises the following steps of: analyzing active power and reactive power characteristics of a fan before and after a fault, enabling the active power and reactive power characteristics to be equivalent to a negative impedance model, merging the fan into a power system to obtain a wind power grid-connected system, and establishing a system motion equation; depicting a system local stability domain boundary BSD in a two-dimensional plane, mapping a two-dimensional local BSD to a three-dimensional unit spherical surface through central projection transformation, and depicting a global BSD of the wind power grid-connected system in combination with an infinite singular point SAIs; determining the position of the SAIs in the projection space by analyzing the SAIs, and establishing a relationship between the SAIs and system parameters; a singular point invariance criterion SIC method is provided according to the relation between the SAIs and system parameters in combination with system BSD changes, and the system parameters are optimized and adjusted in combination with stability constraints; the transient stability control problem of the power system under the current large-scale new energy grid-connected background is solved, and safe and stable operation of the high-proportion new energy grid-connected system is guaranteed.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
A method for stability evaluation of wind power grid-connected system based on manifold and infinite singular point
ActiveCN121308200BSingle network parallel feeding arrangementsWind energy generationNew energyElectric power system
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.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Optical detection and mechanical light path system and signal processing system thereof
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.
Owner:XINYANG NORMAL UNIVERSITY
Positioning method and apparatus, computer device, and storage medium
The application relates to a positioning method and device, computer equipment and a storage medium. The method comprises the following steps: determining feature point global coordinates of regional surface feature points in a monocular photography region in a global coordinate system, and fitting a ground surface elevation model according to the feature point global coordinates; acquiring a calibration board image collected by a monocular camera, and determining feature point image point coordinates of the regional surface feature points in an image coordinate system based on the calibration board image; performing resection on the feature point image point coordinates and the feature point global coordinates, and determining exterior orientation elements; determining a height distance between the monocular camera and the ground, and determining target point estimated coordinates of a target point to be positioned in the global coordinate system according to the exterior orientation elements and the height distance between the monocular camera and the ground by using a central projection conformation equation; and determining three-dimensional global coordinates of the target point to be positioned according to the ground surface elevation model and the target point estimated coordinates. The above scheme improves the positioning accuracy of the target point to be positioned.
Owner:ZHEJIANG FORESTRY UNIVERSITY
High-strength wing glue injection corner combining sheet
Owner:QINGDAO SHUNHE STEEL PLASTIC PROD CO LTD