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1990 results about "Reference surface" patented technology

In fiber optic technology, a reference surface is that surface of an optical fiber that is used to contact the transverse-alignment elements of a component such as a connector or mechanical splice. For telecommunications-grade fibers, the reference surface is the outer surface of the cladding. For plastic-clad silica (PCS) fibers, which have a strippable polymer cladding (not to be confused with the polymer overcoat of an all-silica fiber), the reference surface may be the core.

Building template flatness threshold partition detection method based on normal vector constraint RANSAC

The invention relates to the technical field of building templates, and particularly provides a building template flatness threshold partition detection method based on normal vector constraint RANSAC, which comprises the following steps: performing three-dimensional laser scanning on a building template to obtain high-density point cloud data; preprocessing operations such as denoising and downsampling are carried out on the collected point cloud data, so that the data quality is improved; fitting a reference surface of the template based on the preprocessed point cloud data by using an improved RANSAC algorithm, and introducing a unit normal vector to ensure the correct direction of the reference surface; calculating the vertical distance from each point cloud point to the reference surface to obtain a deviation value; independently setting a deviation threshold value according to a building specification, dividing the deviation value into different grades, and distinguishing and displaying the deviation value on the three-dimensional point cloud model through colors; and a visual result containing the three-dimensional point cloud model and the color identification is output, the flatness condition of the template is visually displayed, and the method has the effects of automatic measurement, high efficiency and high precision.
Owner:BEIJING NO 3 CONSTR ENG

Substation equipment multi-view point cloud data fusion three-dimensional modeling method and system

The invention provides a substation equipment multi-view point cloud data fusion three-dimensional modeling method and system. The method comprises the steps of obtaining original point cloud data under multiple views and synchronously updating an equipment surface feature topological relation; setting a registration reference surface matched with the geometric structure of the equipment according to the spatial distribution characteristics of the point cloud; carrying out rigid alignment by adopting a point cloud registration algorithm based on a feature weight; and calling a curvature constraint-based three-dimensional reconstruction algorithm through the registration error parameters to generate a high-precision grid model. Wherein the registration reference plane setting needs to judge the point cloud coverage integrity and the overlapping area condition, and when the condition is not met, the collection view angle is adjusted or the point cloud data is complemented; the registration condition is judged through a curvature consistency index; the three-dimensional reconstruction process comprises voxel down-sampling, curved surface function construction and grid optimization, and the final model needs to be subjected to electrical safety verification. According to the method, high-precision three-dimensional modeling of the substation equipment can be realized, and the geometric feature reduction degree and the electrical safety verification reliability are improved.
Owner:HUBEI CENT CHINA TECH DEV OF ELECTRIC POWER +1

Transmission housing end face distance measuring device

The invention discloses a transmission housing end face distance measuring device, which relates to the technical field of transmission production equipment and comprises a measuring device rack and a measuring device slidably mounted on the measuring device rack, and a housing base is arranged below the measuring device. The measuring device comprises a mounting frame, a measuring sensor is mounted in the mounting frame, a contact screw mounting plate is movably arranged in the mounting frame, and a contact screw is arranged at the position, corresponding to the measuring sensor, of the contact screw mounting plate. The lower end of the mounting frame is connected with a reference surface contact plate, the contact screw mounting plate is located on the upper side of the reference surface contact plate, the lower side of the contact screw mounting plate is fixedly connected with a third connecting column, and the third connecting column slidably penetrates through the reference surface contact plate and then is connected with a measuring surface contact plate. The device can accurately measure the distance between the two end faces of the transmission housing, is high in measurement precision, is high in measurement efficiency, is good in measurement reproducibility, and can effectively guarantee the service life of a transmission.
Owner:SHENGRUI TRANSMISSION

Self-adaptive correction method for phase-sweeping radan installation angle of swash plate machine

The invention, which relates to the technical field of the radar system, discloses a swash plate machine phase-sweeping radan installation angle adaptive correction method comprising the following steps: acquiring three-axis attitude angle data of an installation reference surface, and synchronously acquiring azimuth angle rotation data of a radar antenna; based on the three-axis attitude angle data of the installation reference surface, establishing a coordinate transformation matrix from a radar antenna coordinate system to an inertial coordinate system, and mapping the three-axis attitude angle data of the installation reference surface to the inertial coordinate system; obtaining a beam scanning conical surface deviation angle according to the coordinate transformation matrix and azimuth angle rotation data of the radar antenna; generating antenna attitude correction according to the beam scanning conical surface deviation angle; and inputting the antenna attitude correction quantity into an antenna driving controller, adjusting the attitude of two axes of pitching and orientation of the antenna, and compensating the beam scanning conical surface deviation. According to the method, the precise coordinate transformation matrix and the angle difference compensation model are established, and the inertial measurement unit and a closed-loop feedback control mechanism are combined, so that the self-adaptive real-time correction of the mounting angle is realized.
Owner:ZHUHAI SOLID MEASUREMENT & CONTROL TECHNOLOGY CO LTD

Three-dimensional point cloud semantic segmentation and measurement reference surface intelligent fitting system and method thereof

The invention relates to the technical field of computer vision and three-dimensional measurement, in particular to a three-dimensional point cloud semantic segmentation and measurement reference surface intelligent fitting system and a method thereof, which are mainly applied to scenes needing accurate three-dimensional space understanding, such as topographic survey, mining, urban planning, intelligent driving and industrial detection. The system comprises a data acquisition module, a preprocessing module, a feature extraction module, a reference surface acquisition module and a pixel feature conversion module. Three-dimensional point cloud data are collected through multi-sensor fusion, and the data quality and integrity are improved. A cascade filtering preprocessing process is innovatively designed, and the data quality is remarkably improved. The feature extraction module generates semantic tags, the reference surface acquisition module calculates a probability optimal fitting plane, and the pixel feature conversion module realizes multi-scale feature output. According to the method, the three-dimensional point cloud processing precision and efficiency are effectively improved, and powerful technical support is provided for the field of computer vision and three-dimensional measurement.
Owner:GUANGDONG POLYTECHNIC COLLEGE

Road corrugated plate integrity detection method based on vehicle-mounted three-dimensional camera

The invention discloses a road corrugated plate integrity detection method based on a vehicle-mounted three-dimensional camera, and relates to the technical field of traffic infrastructure intelligent management and maintenance, and the method comprises the steps: generating a system configuration file through camera internal geometric parameters and multi-line light plane calibration; collecting an image sequence in real time, and extracting a light strip center pixel coordinate; based on a system configuration file, carrying out back projection on the pixel coordinates to solve a three-dimensional intersection point to generate three-dimensional point cloud data of the waveform plate; extracting the three-dimensional point cloud data to obtain the three-dimensional point cloud data of the segmented waveform plate; fitting a reference surface to calculate a height deviation value from a point to a plane; sampling according to multiple layers and multiple intervals and forming a feature string; comparing and identifying defect types and degrees bit by bit; and analyzing the aging trend of the corrugated plate based on historical data. According to the method, the multi-level three-dimensional geometrical characteristics of the surface of the corrugated plate can be efficiently obtained, and automatic identification and positioning of defects are realized.
Owner:SUZHOU MEILITO ELECTRONIC TECH CO LTD

Apparatus and method of vertically adjusting reinforcing support structure

A vertical adjustment mechanism for adjusting the height or elevation of one or more support structures relative to the reference surface. A chair and spacer may be used to adjust the elevation of the one or more support structures. The spacer may include one or more retention clips and / or receptacles.
Owner:REBAR SUPPORT PRODUCTS INC

Plate heat exchanger

The invention provides a plate heat exchanger which is characterized in that a first plate sheet comprises a first trough and a second trough which are adjacent, the first trough and the second trough are sunken downwards relative to the same reference plane P1, and the depth of the first trough is larger than that of the second trough; the second plate sheet comprises a first wave crest and a second wave crest which are adjacent, the first wave crest and the second wave crest protrude upwards relative to the same reference plane P2, and the height of the first wave crest is larger than that of the second wave crest; the first wave crest and the first wave trough are mutually contacted and fixedly welded; the second wave crest is at least partially opposite to the second wave trough, and the height of the second wave crest is unequal to the depth of the second wave trough. According to the plate heat exchanger, through the structural design, the surfaces of the two heat exchange plates forming the inter-plate flow channel have different flow resistances, and flow channels with asymmetric sections are formed between the plates, so that the turbulence degree is larger when fluid flows through, and the heat exchange performance of the heat exchanger is improved.
Owner:ZHEJIANG SANHUA PLATE EXCHANGE TECH CO LTD

Device and method for detecting straightness and perpendicularity of fuel cell stack core

The invention discloses a fuel cell stack core straightness and perpendicularity detection device and method. A reference surface is positioned through a visual camera, and a transmission mechanism drives a laser line scanning instrument to perform line scanning point taking on an upper end plate and fit a reference plane; moving a visual camera through an X-axis or Y-axis transmission mechanism, scanning a long-edge extension line and a short-edge extension line of the upper end plate on a reference surface of the upper end plate along the horizontal direction, obtaining an intersection point, determining a coordinate origin, and performing reference determination by taking the long-edge extension line and the short-edge extension line as X-direction or Y-direction reference of a coordinate system; the transmission mechanism drives the laser line scanning instrument to carry out line scanning on the straightness of the side edge of the reactor core assembly, straightness line scanning data are obtained, line scanning point position coordinate values are obtained, data analysis is carried out according to the coordinate values, and compared with the prior art, high-precision detection of the straightness and perpendicularity of the fuel cell stack core is achieved, and the detection precision is improved. And the assembly quality and performance of the reactor core assembly are ensured.
Owner:SHANGHAI H RISE NEW ENERGY TECH CO LTD

Laminated solar cell and photovoltaic module

The invention relates to the technical field of solar cells, in particular to a laminated solar cell and a photovoltaic module. In the embodiment of the invention, the area of the orthographic projection of a first passivation contact layer on a reference surface is configured to be smaller than the area of the overlapping projection of a top cell unit and a bottom cell unit, and a first passivation layer is arranged on a first sub-surface exposed by the first passivation contact layer and a first target surface of the first passivation contact layer. The opposite side surfaces of the composite layer and the first passivation layer are in contact with each other, so that the efficiency of the battery can be improved.
Owner:JINKO SOLAR (HAINING) CO LTS

Intelligent door anti-pinch method and system

The invention relates to an intelligent door anti-pinch method and system, an intelligent door comprises a frame body and a movable leaf capable of being opened and closed in a sliding mode in the frame body, and the method comprises the steps that the rotation angle value of a motor shaft of a motor unit is collected in real time; measuring an actual distance value between a preset measuring point on the movable leaf and a corresponding reference surface on the door frame in real time through a distance sensor; calculating a theoretical displacement value of the movable fan relative to the initial zero point based on the rotation angle value; continuously comparing the deviation value between the theoretical displacement value and the actual distance value in the displacement process of the movable fan; when the deviation value exceeds a preset safety threshold value, it is judged that the foreign matter exists; and sending a control instruction for stopping door closing or reverse operation. According to the scheme, whether foreign matter blocking exists or not is effectively recognized by comparing the deviation between the motor rotation angle and the theoretical displacement and the deviation between the sensor distance measurement and the actual distance, and non-contact obstacle clamping judgment is achieved. And the method is suitable for various forms of intelligent sliding door systems.
Owner:SHENZHEN HOPO WINDOW CONTROL TECH CO LTD

Multifunctional hydraulic system experiment table

The invention discloses a multifunctional hydraulic system experiment table, which relates to the technical field of hydraulic system experiment tables and comprises a time base line synchronous control module, a phase lock correction stability control module, a false peak identification and correction module, a multi-dimensional fault-tolerant judgment control module and a reverse energy slow-release anti-reverse module. And the time base line synchronous control module is used for establishing a cross-sensor unified time base line control structure, generating a synchronous reference surface by using a high-stability crystal oscillator signal, and executing nanosecond phase calibration on sampling signals of the pressure sensor and the flow sensor by taking the synchronous reference surface as a unified time reference. According to the invention, high-precision synchronous acquisition of pressure and flow signals is realized through unified time base line and phase locking correction, and high-pressure transient test data is ensured to be real and stable; and meanwhile, control logic is reconstructed, and an energy slow release strategy is introduced, so that the pressure relief process is stable and controllable, pump reverse rotation and structural impact are avoided, and the safety, reliability and self-healing stability of the experiment table are remarkably improved.
Owner:YUNYU (TIANJIN) AVIATION TECHNOLOGY CO LTD

Production control method and system based on SPC alarm linkage process locking

The invention provides a production control method and system based on SPC alarm linkage process locking, and relates to the technical field of quality management and control, and the method comprises the steps: deploying an SPC sensing node used for collecting technological parameters at a cutting edge position where a machining tool of production equipment is in contact with a workpiece, or at a contact point where a probe of online measurement equipment is in contact with the surface of the workpiece; the method comprises the following steps: acquiring process parameter data of a key production process in real time through an SPC sensing node deployed at a cutting edge position or a contact point; inputting the process parameter data as real-time data or small sample expansion data into an SPC judgment engine; and performing statistical process control analysis on the real-time data or the small sample expansion data through an SPC judgment engine so as to model data clusters which are densely distributed and have stable parameters in the data into a virtual reference curved surface representing a normal state domain. According to the invention, the accuracy of abnormity determination can be improved, and timely management and control of quality abnormity and minimization of production loss can be realized.
Owner:SHANGHAI JUKE FLUID CONTROL CO LTD

Vibration monitoring and displacement identification method for towering steel structure based on machine vision

The invention discloses a vibration monitoring and displacement identification method for a towering steel structure based on machine vision, and relates to the technical field of towering steel structures. Comprising the following steps: S1, visual acquisition and reference calibration: arranging visual acquisition equipment in the height direction and the circumferential direction of the towering steel structure according to mechanical characteristics of a vertical stiffness mutation region and a dynamic response sensitive part of a geometric asymmetric distribution characteristic of the structure; a three-dimensional coordinate system is established based on a structure installation reference surface, fixed reference monitoring points are arranged in a tower foot symmetric area and a mast antenna root, three-dimensional coordinate data of the reference points are synchronously collected, the collection range completely covers a node concentration area and a key stress part of a structure transparent area, and a continuous image sequence of the structure surface is captured in real time; the resolution and the sampling frequency of the visual acquisition equipment are determined according to the inherent frequency of the structure and the vibration response characteristics, and calibration is completed through reference point coordinates after the equipment is installed; s2, carrying out image preprocessing and feature enhancement; S3, carrying out feature point extraction and trajectory tracking; S4, carrying out vibration displacement calculation and twin fusion; and S5, carrying out multi-source verification and structural state linkage treatment.
Owner:中建三局集团西北有限公司 +1

Method for assembling and adjusting off-axis free-form surface ray machine structure

PendingCN120276169AOptical elementsRayMachining
The invention provides an assembling and adjusting method of an off-axis free-form surface ray machine structure. The off-axis free-form surface ray machine structure comprises a main frame, a primary mirror and a secondary mirror (or a third mirror). The adjustment system comprises a CGH device and an interferometer. When an optical machine structure is designed and processed, a mounting reference surface and a positioning feature mark are processed on a main frame and an optical element in a high-precision processing mode. In the installation and adjustment process, the optical element is connected with the main frame through the installation reference surface, and coarse positioning installation is achieved; fine positioning and adjustment are carried out on the assembly body through the positioning feature marks; and finally, the light emitted by the interferometer sequentially passes through elements in a light path and returns to the interferometer to form interference fringes, and the pose of the secondary mirror (or the third mirror) is adjusted by taking the primary mirror as a reference until zero fringes are displayed on the interferometer. According to the method, corresponding structure reference transmission is considered during design of an optical machine structure, and rapid integrated assembly and adjustment of the off-axis free-form surface optical machine system are realized through positioning feature marking during assembly, so that the assembly and adjustment precision is high.
Owner:西安应用光学研究所

PCB plug hole flatness detection method and system based on 3D point cloud data

The invention belongs to the technical field of image processing, and particularly relates to a PCB plug hole flatness detection method and system based on 3D point cloud data, and the method comprises the steps: obtaining the original 3D point cloud data of a PCB, and intercepting a plug hole center and a local point cloud block according to a design file; a copper ring point cloud set is extracted, and the fitting weight of each sampling point is calculated based on the distance from each sampling point in the set to the center of the plug hole, the unit normal vector of the sampling point and the original height of the sampling point; performing weighted least square fitting on all the copper ring point clouds by using the fitting weight to obtain a virtual reference curved surface; extracting an effective point cloud set, calculating the correction height of the effective point cloud, and calculating a flatness index in combination with the mean value of the correction height and the module length of the local gradient; the flatness index of the physical space is obtained, and whether the flatness of the plug hole is qualified or not is judged. According to the method, the problem of misjudgment caused by board warping is effectively solved, and the detection precision and the anti-noise capability are improved.
Owner:SUZHOU SHENGFENG ELECTRONIC TECH CO LTD

Method for detecting head height of bolt

The invention discloses a method for detecting the head height of a bolt, and the method comprises the following steps: carrying out the projection of the head of the bolt through employing a structured light 3D camera, and obtaining the three-dimensional point cloud data of the head of the bolt; after abnormal points are processed, a bolt head area template is constructed; bolt head positioning is carried out on the bolt head area template and the actual detection area; selecting a plurality of local point cloud data in the bolt head area, and setting the local point cloud data as bolt head positions; selecting a plurality of local point cloud data on the outer side of the bolt head area, and setting the local point cloud data as bolt reference surface positions; and calculating the distance between the bolt head position and the bolt reference surface position by using a point-to-plane algorithm. The bolt head height detection method provided by the invention has the advantages of one-key operation, simple operation, fast measurement speed, automatic data and picture storage, and solving of pain points which cannot be traced by conventional contact measurement.
Owner:JUNSHENG QUNYING (NANJING) NEW ENERGY VEHICLE SYST RES INST CO LTD +1

Tab cracking detection method and device, tab welding equipment and battery production system

The embodiment of the invention provides a tab cracking detection method and device, tab welding equipment and a battery production system. The tab cracking detection method comprises the following steps: acquiring three-dimensional coordinate data of a plurality of reference areas to construct a reference surface; acquiring three-dimensional coordinate data of the surface of the tab, and determining a to-be-detected analysis area of the tab by comparing the height characteristic difference between the surface of the tab and the reference surface; and determining a detection result of whether the tab is cracked or not based on at least one of a height difference criterion and a morphology mutation criterion of the to-be-detected analysis area relative to the reference surface. Compared with a traditional manual visual inspection mode, the detection accuracy of quality defects such as tab cracking can be remarkably improved.
Owner:JIANGSU CONTEMPORARY AMPEREX TECH LTD

Surface estimation method, surface estimation device, and recording medium

A surface estimation method includes a region-setting step and an estimation step. In the region-setting step, a reference region that is one of a three-dimensional region and a two-dimensional region is set. The three-dimensional region includes three or more points and is set in a three-dimensional space. The three-dimensional space includes three-dimensional coordinates of three or more points on a subject calculated on the basis of a two-dimensional image of the subject. The three-dimensional coordinates of the three or more points are included in three-dimensional image data. The two-dimensional region includes three or more points and is set in the two-dimensional image. In the estimation step, a reference surface that approximates a surface of the subject is estimated on the basis of three or more points of the three-dimensional image data corresponding to the three or more points included in the reference region.
Owner:EVIDENT CORP

Lens antenna

The utility model provides a lens antenna, which relates to the technical field of antennae and comprises a luneberg lens, an earth radiation unit, an air radiation unit, a horizontal adjusting mechanism and a tipping adjusting mechanism. The center of the Lunberg lens is located on a reference plane, and the reference plane is parallel to the horizontal plane or forms a preset included angle with the horizontal plane. The to-ground radiation unit is arranged towards the center of the luneberg lens in a radiation manner, and the to-ground radiation unit is located above the reference surface; the air radiation unit is arranged towards the center of the luneberg lens in a radiation manner, and the air radiation unit is located below the reference surface; the horizontal adjusting mechanism is used for synchronously adjusting the main radiation direction of the to-ground radiation unit and the main radiation direction of the to-air radiation unit in the horizontal direction; and the tipping adjusting mechanism is used for independently adjusting the elevation angle of the main radiation direction of the air radiation unit. The lens antenna provided by the utility model has the characteristic of multidimensional adjustability, can meet the requirements of low altitude and ground coverage at the same time, and is compact in structure and small in occupied space.
Owner:CHINA UNITED NETWORK COMM GRP CO LTD

Machining center tool wear state early warning method based on multi-source data fusion

The invention belongs to the technical field of tool wear measurement, and particularly relates to a machining center tool wear state early warning method based on multi-source data fusion, and the method comprises the steps: calculating a cutting power consumption characteristic through a main shaft load energy mapping model according to the original sampling current and the real-time feeding speed of a main shaft; sliding window sampling is carried out on the cutting power consumption characteristics, and the cutting state disorder degree is calculated; performing nonlinear coupling on the power consumption gradient item and the cutting state disorder degree to obtain a grinding loss stability coefficient; and establishing a dynamic statistical reference surface, and performing cutter state early warning according to the deviation degree of the grinding loss stability coefficient monitored in real time. Instantaneous interference caused by uneven material hardness is effectively recognized and eliminated, meanwhile, signal structure disorder at the initial stage of tool failure is captured, the technical problems that in die steel machining, due to material structure segregation and variable working conditions, the false alarm rate is high, and failure precursor capturing is difficult are solved, and the machining precision is improved. And the monitoring accuracy of the precision machining process is obviously improved.
Owner:JIANGSU HUADONG SANHEXING MOULD MATERIAL CO LTD

Calibration and setup for a machine guidance system

A system and method for calibrating and setting up a machine guidance system for construction assets, such as loaders or excavators, employ point cloud data from onboard optical sensors to acquire spatial measurements. Point cloud data is transformed to an asset coordinate frame, candidate pitch and roll offset values are applied, grid representations are generated, and calibration values are selected with reduced error by comparing these grids to a reference surface. The system and method support autonomous operations including obstacle avoidance and grading by modifying the point cloud data according to the determined calibration values. In addition, dual-sensor calibration, terrain mapping, and filtering techniques are disclosed.
Owner:EQUIPMENTSHARE COM INC

Calibration method for external parameters of camera and laser radar and related device

The invention discloses an external parameter calibration method for a camera and a laser radar and a related device, the camera corresponds to a camera calibration board, the laser radar corresponds to a laser calibration board, and the method comprises the following steps: obtaining coordinates of an original point of the laser calibration board in a camera calibration board coordinate system; wherein the laser calibration plate and the camera calibration plate are fixed on the reference surface on the same side in the two intersected reference surfaces, and the two intersected reference surfaces correspond to an intersecting line; camera feature points are obtained based on the coordinates of the original point of the laser calibration plate in the camera calibration plate coordinate system and the camera calibration plate and the camera coordinate system corresponding to the camera; obtaining laser feature points based on the intersection line and the first point cloud data corresponding to the laser calibration plate; and obtaining relative pose parameters of the camera and the laser radar based on the camera feature points and the laser feature points. According to the scheme, the efficiency and precision of external parameter calibration can be improved.
Owner:ZHEJIANG HUARAY TECH CO LTD

Precise centering installation method for coupling of permanent magnetic direct drive system of flotation machine

The invention relates to the technical field of flotation machines, in particular to a precise centering installation method for a coupling of a permanent magnetic direct drive system of a flotation machine. Comprising the following steps that a plurality of sets of measuring assemblies are arranged at the driven end of the coupler, each measuring assembly comprises a laser module used for collecting spatial position parameters and a sensor module used for collecting vibration parameters, installation reference planes of the laser modules and the sensor modules are subjected to precise grinding treatment, and the flatness error does not exceed 0.002 mm; the permanent magnet direct drive system is started to enable the coupler to rotate at a preset low speed, multiple sets of reference parameters in the initial state are obtained through the measuring assembly, and a reference model is established; in the installation process, spatial position deviation and vibration signals of the coupler at different rotation angles are collected in real time; according to the scheme, dynamic interference can be processed, and accurate pre-judgment and active adjustment are realized.
Owner:INNER MONGOLIA YOUPUSEN ELECTRIC CO LTD

Railway platform displacement measuring system and measuring method thereof

A three-dimensional displacement measuring system for a railway platform comprises a laser, an angle sensor, a high-magnification camera and an LED (light-emitting diode) illuminating lamp which are respectively arranged on a fixed upright post, the target is adhered to the edge of the platform to form a measurement reference surface, and the horizontal distance between the stand column and the target is a preset value; the system establishes a virtual zero point and defines a space rectangular coordinate system XYZ, the X axis is in the longitudinal direction of the platform, the Y axis is perpendicular to the edge of the platform, and the Z axis is vertically upward. The invention provides a non-contact, high-precision and low-power-consumption railway platform three-dimensional displacement measurement method, which comprises the following steps of: performing periodic laser scanning and image acquisition on a target adhered to the edge of a platform by utilizing a vision measurement system formed by double lasers and a high-magnification camera and combining feedback information of an angle sensor; and the relative displacement of the X axis, the Y axis and the Z axis in the space is inversely calculated through a geometric model. The method can automatically complete the whole-process operation of zero calibration, photographing, identification, calculation, storage and the like, and meets the actual requirements of long-term structure monitoring of the railway platform.
Owner:CHINA RAILWAY BEIJING BUREAU GRP CO LTD BEIJING STATION +1

Solder paste defect detection method based on machine vision

The invention discloses a solder paste defect detection method based on machine vision, relates to the technical field of printed circuit board detection, and aims at the challenge of solder paste printing quality detection in superfine-pitch high-reliability manufacturing, high-precision three-dimensional point cloud data is collected and an attitude matrix is marked through laser triangle-grating interference dual-mode imaging and board micro-vibration sensing; constructing an adaptive reference surface based on the point cloud and real-time fitting warping curved surface parameters, executing local height remapping, and eliminating the influence of micro warping; calculating a warping composite slope index and a glare texture robust index by using the height matrix, and adjusting a confidence threshold of the boundary enhanced convolutional network to realize real contour segmentation of adjacent pads; dynamically updating imaging parameters, accumulating real scene samples, and optimizing the adaptive ability of the model; and cross-shift knowledge reuse is realized through the shared model library. According to the invention, the volume measurement consistency and the first pass yield of the ultra-fine pitch bonding pad can be improved, and the process debugging time is shortened.
Owner:ANHUI GUJING NEW MATERIALS CO LTD

Movable package stacking dip angle detection device and dip angle detection method

The invention relates to a movable package stacking inclination angle detection device which comprises a device frame with walking wheels arranged at the bottom, a lifting platform is arranged on the device frame, a measuring rod is hinged to the upper end of the lifting platform, and a laser distance measuring sensor is arranged at the end, away from the hinge axis, of the measuring rod. The laser emitting direction of the laser distance measuring sensor is consistent with the length extending direction of the measuring rod, the upper end of the lifting platform is provided with a horizontal datum plane, and the measuring rod is provided with a horizontal datum measuring station with the lower end supported on the horizontal datum plane. The stacking inclination angle detection device further comprises an angle measuring device used for detecting the inclination angle of the measuring rod relative to the horizontal datum plane. The invention provides the movable package stack inclination angle detection device capable of measuring the package stack inclination angle and the inclination angle detection method using the movable package stack inclination angle detection device.
Owner:HENAN UNIVERSITY OF TECHNOLOGY +1

Building space truss construction method and system, storage medium and electronic equipment

The invention relates to a building space truss construction method and system, a storage medium and electronic equipment, and the building space truss construction method belongs to the technical field of building manufacturing, and comprises the steps: obtaining an upper chord curved surface and a lower chord curved surface, determined by taking a roof curved surface as a reference surface, of a target building; taking the column grid size, the upper chord grid size and the lower chord grid size as input data of a parameterized model, and performing grid structure division on the upper chord curved surface and the lower chord curved surface in the parameterized model to obtain an upper chord, a lower chord and column node group vectors corresponding to the upper chord and the lower chord; performing crossover operation on the column node group vectors corresponding to the upper chord member and the lower chord member to obtain a net rack web member; the space truss of the target building is constructed on the basis of the upper chord member, the lower chord member and the truss web member, the whole process can be automatically carried out through a parameterized model and a corresponding software system, manual construction is not needed, and therefore material waste caused by manual construction is reduced, and the structural performance of the constructed truss is improved.
Owner:CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP CO LTD

Active damping system

The invention discloses an active vibration reduction system. The active vibration reduction system comprises a lower device, and the lower device comprises a base, a base table located above the base and a lower displacement device for driving the base table to move relative to the base; one side of the base away from the base is provided with a first reference surface; a scanning probe of the probe distance sensing device is located above the first reference surface, and the probe distance sensing device is used for detecting the distance between the first reference surface and the scanning probe; and the main control module is electrically connected with the lower displacement device and the probe distance sensing device, and the main control module controls the lower displacement device to drive the base table to move relative to the base according to the distance between the first reference surface and the scanning probe measured by the scanning probe. Compared with the prior art, the active vibration reduction system is better in vibration reduction effect.
Owner:PARCAN LAB CO LTD

Assembly tool and assembly method of divertor

The invention relates to the technical field of fusion reactors, and discloses an assembly tool and an assembly method of a divertor, a box body is positioned and mounted on the assembly tool through a first positioning surface, a second positioning surface and a third positioning surface; through the first reference surface and the second reference surface, a reference coordinate system is set during assembly and detection of the target plate, and the target plate is detected and adjusted by taking the reference coordinate system as a reference, so that the profile tolerance of the target plate conforms to an error allowable range; therefore, it is guaranteed that the divertor obtained through assembling of the assembling tool has enough assembling precision; by the adoption of the assembling tool, the box body is installed on the assembling tool, then the target plate and the box body are preliminarily positioned, a reference coordinate system is established in cooperation with a laser tracker, the actual contour of the target surface of the target plate is obtained, the target plate is correspondingly adjusted, the assembling precision is improved, and normal work of a divertor is effectively guaranteed; and the normal cooling work of the cooling channel can be ensured through the leak detection test.
Owner:HEFEI INSTITUTE OF PHYSICAL SCIENCE CHINESE ACADEMY OF SCIENCES