518results about How to "Accuracy meets" patented technology

The invention discloses a modular unmanned vehicle positioning method and system based on visual inertia laser data fusion. The method comprises the following steps that (1), an acquisition module acquires current information of an unmanned vehicle through a monocular camera, a laser radar and an IMU; (2), according to the current information of the driverless vehicle collected in the step (1), apose estimation module performs pose estimation of the vehicle through a monocular odometer and an IMU pre-integration model to obtain pose information of the unmanned vehicle; and (3), a pose optimization module establishes a multi-sensor fusion optimization model according to the pose estimation information in the step (2), a weight coefficient dynamic adjustment module adjusts the optimizationproportion of each sensor to enhance the environmental adaptability, the optimal pose of the vehicle is obtained after optimization, and the optical pose is converted into a world coordinate system to obtain the real-time pose of the vehicle. The method can meet the requirements for accuracy and robustness of positioning of the unmanned vehicle in a complex environment, and is suitable for positioning of the unmanned vehicle in the complex environment.

The invention discloses a system for evaluating the performance of a chip through the collaboration of multiple processors. The system comprises an open short circuit detection module, a USB communication processing module, a PMU control module, a signal scanning module, a voltage control module, a frequency measurement module, a test index evaluating module and an expansion measurement module. The performance indexes and the parameters of multiple chips are controlled to be tested and evaluated on the research and design stage, PC controlled software is taken as a man-machine interface, multiple types of index tests are integrated on one system through synchronous testing to test and evaluate the chip, and the testing efficiency is greatly improved.

The invention relates to a testing method and a testing device of a train pneumatic performance simulation moving module. The testing method comprises the following steps: a train model on rails is used, one end of the trail model is provided with an elastic traction mechanism which passes through a travelling block speed increasing mechanism and a traction train module; the train model is pulled to the other direction of the other rail to enable the elastic traction mechanism to tension to generate contraction elasticity; and the pulled train model is released and is speeded up to the testing speed under the drive of the contraction elasticity of the elastic traction mechanism. The invention has simple implementation method and easy control, can realize the operation that the trail can quickly accelerate to 400 km / h from still and from high-speed brake to still, has higher testing accuracy, can relatively truly reflect ground effect and train crossing condition and reflect various actual running states of trains on rails.

The invention discloses a real-time stereoscopic vision implementation method based on FPGA. The implementation method operates in stereoscopic vision system which takes the FPGA as a core processing unit, has reasonable hardware structure, can meet the requirements of high-speed operation and high-seed transmission images, has multiple general interfaces and rich hardware resources, and can be further expanded and strengthened. Simultaneously a stereoscopic matching algorithm based on Census conversion is a non-parameterized matching method, is more robust for the conditions of non-uniform brightness, gain and the like, and improves the accuracy of the system. The invention adopts the reasonable hardware structure on the FPGA architecture, simultaneously implements a Census stereoscopic matching method by an ingenious logic design, and improves the accuracy and speed of stereoscopic vision implementation. Compared with the traditional method based on a general processor, the real-time stereoscopic vision implementation method utilizes parallel calculation and a reasonable production line design fully to map the algorithm on the structure, greatly improves the operating speed of the system, meets the requirements of high resolution, high accuracy and high speed and can be applicable to fields of autonomous vehicle navigation and the like.

The invention discloses a complicated workpiece on-line detection system for a numerical control machining centre, and aims to monitor and control the quality in the machining process, shorten the machining and manufacturing period of a large-scale complicated workpiece and change the current situation of a manual detection mode or an off-line spot check mode in the conventional field of machining and manufacturing. On-line detection equipment mainly comprises a numerical control machining centre, a combined measuring head, a wireless signal transceiver, a control computer and measuring software thereof. The on-line detection technical scheme is that: the numerical control machining centre is used as a measurement movement driving mechanism; a spindle of the numerical control machining centre drives the combined measuring head to measure the workpiece and transmits the measured result to the control computer through the wireless signal transceiver, the result is subjected to model reversion and data fusion postprocessing, and a workpiece machining quality report is provided on line in real time, so the qualification rate of finished products and the machining efficiency are improved.

A non-invasive apparatus and method for measuring the speed of a rotating device that includes a sensor that measures a dynamic characteristic of the rotating device. A sample of the signal is transformed from the time domain into a frequency spectrum. The frequency spectrum is then analyzed to determine the motor speed. The resulting motor speed can be combined with other motor data by an order analysis to identify malfunctioning or improperly installed components.

Method of estimation and segmentation of the volume of a three-dimensional object in medical imagery, in which:one defines a given number of base points constituting a first three-dimensional shape defined by facets;each facet of the first shape being defined by three segments, the segments are divided by defining second order points adapted to the contour of the object, so as to constitute a second three-dimensional shape closer to the contour of the object than the first shape;each segment is iteratively divided into subsegments adjusted by defining third order points adapted to the contour of the object, so as to constitute a third three-dimensional shape closer to the contour of the object than the second shape;then, the volume of the third three-dimensional shape is calculated.

The invention discloses a gesture identification method based on a deep residual error network. The gesture identification method based on a deep residual error network includes the steps: 1) acquiring the original data information of gesture, and marking N points to obtain the 2N-dimensional original tag data; 2) preprocessing the original data information and the 2N-dimensional tag data; 3) taking the preprocessed original data information and the 2N-dimensional tag data converted in the hdf5 format as the original training data, inputting the original training data to a deep residual error network to train network parameters, and obtaining a gesture identification model; 4) performing N-point marking being identical to the step 1 on the gesture to be identified to obtain the 2N-dimensional tag data to be identified; and 5) preprocessing the gesture data to be identified and the 2N-dimensional tag data to be identified, inputting the processed gesture data and the 2N-dimensional tag data to be identified converted in the hdf5 format to the gesture identification model for identification, and then obtaining an identification result. The gesture identification method based on a deep residual error network effectively solves the gradient dispersion problem and the network accuracy problem.

The embodiment of the invention provides a method, a device and a system for data synchronizing, a medium and electronic equipment. The data synchronizing method comprises the following steps of detecting the change of records and table structures of logs in a database, and obtaining the change data of the records and the change data of the table structures of the logs in the database; sending thechange data of the records to a HBase data control write module; sending the change data of the table structures to a Hive table structure synchronizing module. By adopting the technical scheme, thedata synchronizing method provided by the embodiment has the advantage that the problems of inaccuracy in data and inconsistency of data structures are solved by a log analysis real-time duplicating technique, data version control and delay control, so as to reach the effect of complete consistency between the same-day data of a Hive database and the change data of a source database, and meet theT+1 high-precision data analysis and report requirements of the Hive database.

The invention relates to a distributed optical fiber temperature sensing measurement device which comprises a measuring host machine and a sensing optical cable, wherein the measuring host machine comprises a laser, a light split module, a detection module and an analysis unit; the device is characterized in that the sensing optical cable is provided with a temperature sensor; the light split module is used for respectively filtering out scattered lights transmitted along the sensing optical cable and reflected lights / transmitted lights of the temperature sensor and transmitting the scattered lights and the reflected lights / transmitted lights to the analysis unit by the detection module; and the analysis unit is used for obtaining distributed temperature measuring data according to the information of the scattered lights and obtaining dot-type temperature measuring data according to the information of the scattered lights and the reflected lights. The invention also provides a distributed optical temperature sensing measurement method. The device and the method combine the distributed measurement function and the dot-type measurement function, can also carry out on-line temperature correction and have the advantages of simple structure, low cost and the like.

A method for measuring geometric parameters of a track by adopting a camera comprises the following steps: a measuring vehicle is placed on the track to be measured; a camera device is fixedly installed on one end inside the measuring vehicle; an optical axis of the camera device is in parallel with the plane of the bottom of the measuring vehicle; two sign posts are arranged on the track at the other end inside the measuring vehicle and are respectively perpendicular to the two sides of the plane of the bottom of the measuring vehicle; the two sign posts are at different heights and at the distance of r; a cooperation sign is arranged at the top end of each sign post; the sign posts can only move in the direction perpendicular to the plane of the bottom of the vehicle and in the transversal direction; a wheel at the bottom of the sing post moves, and is tightly attached to the inner side of a steel track; when the measuring vehicle moves on the track to be measured, the camera device is utilized to capture images of the cooperation signs at different time; and the images is processed through image processing and data processing on a real-time basis so as to acquire the geometric parameters of the track. The method meets the requirements of modern track construction and development, satisfies the requirements of high precision, high reliability and high automatic degree detection, and has good application prospect in the railroad engineering field.

The invention discloses an IP network transmission method for automatically adapting network dithering, which comprises the following steps: IP data messages in a plurality of cycles are received; according to the IP data messages in a plurality of cycles, whether the dithering excesses a set dithering threshold is judged; if the dithering excesses the set dithering threshold, an amplitude of adjusting clock frequency is reduced to achieve the aim of adjusting a loop bandwidth of a phase-locked loop; if the dithering does not excess the set dithering threshold, a local clock is adjusted according to an actual frequency deviation value. The invention discloses an IP network transmission system and equipment for automatically adapting network dithering. When IP restores the clock, according to the network dithering situation, the invention can automatically select proper parameters for adjusting local clock frequency, thereby achieving the aim of clock synchronization, ensuring the rapidity of the clock synchronization and meeting the accuracy of the clock synchronization.

The invention relates to a large-scale radar antenna deformation real time measurement system, comprising a plurality of PSD laser sensors for measuring the deformation amount of deformation key points and laser sources corresponding to the deformation key points on one-to-one basis; the output terminal of the PSD laser sensor is connected to the input terminal of a data collection unit; the output terminal of the data collection unit is connected to the input terminal of the data processing unit; the output terminal of the data processing unit is connected to the input terminal of a deformation display unit for displaying whole deformation curve surface of an antenna array on real time. The invention also discloses a large-scale radar antenna deformation real time measurement method. The invention converts the whole field deformation measurement of a super big array to a series of relative deformation measurements corresponding to the key points, which is simple in theory, small in devices, high in accuracy, fast in processing data, and can satisfy the real time performance measurement needs for big array surfaces and high accuracy.

The invention relates to a target tracking method under complicated background based on an extreme learning machine. The method comprises the following steps: a detection module, a tracking module and an integration module are provided, wherein the detection module and the tracking module can operate independently and simultaneously and are used for carrying out detection and tracking on a target needing tracking; a detector in the detection module carries out multi-scale detection on a tracking target in the previous frame and outputting a result; a tracker in the tracking module carries out tracking on the tracking target in the previous frame and outputting a tracking result; the integration module receives the results output by the detection module and the tracking module in the step S5 and carries out comprehensive analysis on the results, and takes the result, of which the confidence degree is the highest, as the tracking target of the current frame and outputting the result; and repeating the steps above until the final video frame is finished. The detection module and the tracking module can operate independently and simultaneously, and the integration module integrates the results of the two modules, so that tracking precision and robustness can be improved effectively.

The invention discloses 3D (three dimensional) printing equipment for preparing a thermoplastic elastomer product, which mainly consists of a material melting and conveying unit, a material squeezing unit, a three-dimensional coordinate platform and a rack; in the material squeezing unit, a valve body is full of melted and plasticized materials through a hot runner; the opening and closing of the nozzle of the valve body is controlled by a valve needle; the valve needle is fixed onto a thermal insulator which has certain elastic deformation capability and thermal insulation capability; corresponding force is applied to the upper side of the thermal insulator by using a spring and an electromagnet, so as to enable pressure generated by the melted materials in the valve body to be balanced with the applied force, so that the valve needle can seal the nozzle, and when the electromagnet is controlled to intermittently move up and down according to certain rules by a controller, the valve needle also moves up and down correspondingly due to the fact that the balance of the force is broken, so that the nozzle is continuously opened and closed to form micro droplets; micro droplets are cooled and formed on the three-dimensional platform, and the product is finally printed. According to the equipment disclosed by the invention, different materials of micro droplets or fuses can be sprayed according to different time sequences, and the product, which is made from a soft and hard composite material and has multifunctional gradients, can be printed.

The invention relates to the field of printing ink and discloses high-covering-power styrene-acrylate emulsion, a synthesis method thereof and use thereof in aqueous printing ink. The preparation method comprises: mixing deionized water, an initiator, a lacquer and a composite emulsifier to obtain solution A; regulating the pH value; introducing nitrogen to remove oxygen; mixing a monomer with a molecular weight regulator to obtain solution B; dripping solution B into solution A to perform a chemical reaction; regulating the pH value of shell emulsion and heating to prepare shell emulsion; adding a composite emulsifier and an initiator into the synthesized shell emulsion; dripping a vinyl monomer to synthesize core-shell emulsion; and cooling, regulating the pH value and filtering to obtain the styrene-acrylate emulsion. The invention also provides aqueous printing ink using the high-covering-power styrene-acrylate emulsion. The preparation process is very simple, the reaction processis simple and easy to control, the operability is high, and the method is suitable for large-scale production. The aqueous printing ink disclosed by the invention is high in resolubility, is insusceptible to crusting and blocking printing plate and has high printing adaptability.

The invention relates to a manufacturing method of a hot extrusion polyethylene zinc-aluminum alloy coating steel wire cable. In accordance with the arrangement rule of steel wires at the cross section of the cable, the length of the cable is controlled through the center standard wire, zinc-aluminum alloy coating steel wires are bundled through the twisting angle being 2-4 degrees, a high-strength polyester belt is wound on the outside of the steel wire bundle, a double-layer high-density polyethylene protection layer is hot-extruded through the double-cavity co-extrusion one-time forming process, wind-rain induced vibration prevention embossing is arranged on the outer layer of the polyethylene protection layer according to the wind-rain induced vibration design requirement of the cable, and coiling down and storage are performed after the two ends of the cable are anchored. Finally, the cables are transported to the erection scene according to the delivery request, and erected one by one. The manufacturing process of the cable is free from site limits of construction sites, small in climate factor influence, convenient to control due to factory production management, and capable of meeting the use requirements for long length, high accuracy and durability of stay cables in super-large long-span bridges at the marine environment.

A method for manufacturing a polarizer of the invention, wherein the polarizer comprises a film that comprises: a matrix made of an optically-transparent resin containing a dichroic absorbing material; and minute domains that are made of an energy ray-curable birefringent material having liquid crystalline properties and are aligned and dispersed in the matrix; and comprising a process of applying energy rays for fixing the alignment of the birefringent material having liquid crystalline properties. A polarizer obtained by the method has a high transmittance and a high polarization degree, and being able to control unevenness of the transmittance in the case of black viewing.

The invention discloses an alternating current (AC) impedance spectroscopy automatic testing device of positive temperature coefficient (PTC) thermistor. The device comprises an electric heating oven for holding a sample, a temperature control and protection circuit for maintaining the electric heating oven at a constant temperature and preventing overcurrent, an impedance measuring circuit for measuring the sample impedance, and a master control machine connected with two circuits via a CAN bus respectively and used for receiving a user instruction and controlling the two circuits to accomplish measurement. The impedance measuring circuit in the invention is based on high-speed synchronous data acquisition and digital signal processing technology, satisfies the measurement requirements for high precision, wide measurement range and wide frequency band, and has features of small volume, low cost and convenient operation. Data communication among the temperature control and protection circuit, the impedance measuring circuit and the master control machine is realized via CAN buses, to achieve good real-time property and high reliability. The invention can ensure constant-temperature testing environment, carries out multi-frequency point scanning measurement to the AC impedance of the tested sample, and realizes full automatic testing of impedance-temperature characteristics of the PTC thermistor under different frequencies.

A clinical examination disk according to the invention includes a disk body in a disk form, and at least one cell formed in the disk body, wherein the cell comprises a specimen reservoir formed in the disk body and having a specimen injecting port, a reaction tank formed in the disk body so as to position nearer to the outer circumference of the body than a position of the specimen reservoir, and holding a reagent which is reactive with the specimen and is beforehand gelatinized, a first narrow tube formed in the disk body, and communicating to the specimen reservoir and the reaction tank, and a second narrow tube formed in the disk body, and having one end connected to the reaction tank and the other end made open.

The invention discloses a broadband low-current measurement device based on an isolated PCB-type Rogowski coil. The measurement device comprises the isolated PCB-type Rogowski coil, an integral circuit, an amplifying circuit and a signal receiving device. The integral circuit is a current mode integral unit achieved through a transconductance amplifier. According to the broadband low-current measurement device, measurement of power-frequency or high-frequency high-precision low currents can be achieved, the measurement bandwidth can reach 50-20KHz, the measurement precision can reach 0.5A, and defects of a conventional Rogowski coil in low current measurement are eliminated. According to the broadband low-current measurement device, the isolated PCB-type Rogowski coil serves as a sensing head, the broadband low-current measurement device has the advantages of being easy to install, low in weight, easy to manufacture and the like, and by means of the current mode integral unit achieved through the transconductance amplifier, errors can be effectively reduced and the bandwidth is increased.

The invention provides a target displacement vector measuring device and method based on laser tracker point-by-point calibration, and belongs to the technical field of infinitesimal displacement measurement. The target displacement vector measuring device and method aim to solve the problem that measurement results obtained through a method for detecting target infinitesimal displacement through an existing visual-inspection measuring system are low in accuracy. The device comprises a high-speed CCD video camera, a laser tracker and a diffuse reflection projection screen, wherein a target object moves on the diffuse reflection projection screen. According to the method, first, a corresponding relation look-up table is established based on the principle that imaging points of target object calibration points and target object calibration points acquired through the laser tracker are conjugated; then, the high-speed CCD video camera is used for sequentially imaging screen light spots of the target object, a conjugate point of a target object projection point is acquired, and the coordinate value of the target object projection point on a projection screen coordinate system is obtained through table look-up or a resolving method combining table look-up with bilinear interpolation. The target displacement vector measuring device and method based on laser tracker point-by-point calibration are used for measuring a target displacement vector.

The invention discloses a photosensor testing sorting machine which comprises a main tower rotating disc system, a feeding screening module and a feeding transfer device. The main tower rotating discsystem performs systematic control over module devices, a loading disc containing a device is placed on a product launching loading platform of the feeding screening module, a vision CCD device of thefeeding screening module recognizes the device, a device taking and placing suction nozzle selects a product of a correct directional surface from the loading disc, and the product is transferred toa device positioning reverse mold of the feeding transfer device; the feeding transfer device transfers the product to the portion under the working position of a vacuum suction nozzle of the main tower rotating disc system; the existing production mode that workers perform manual testing under the special environment and workers perform appearance inspection under a microscope is changed into themode that machine equipment intelligently and automatically selects a qualified product, and unqualified products are classified concentratedly; in this way, the production efficiency is high, the error rate is low, the mode can be popularized to mass production, the labor cost is greatly reduced, and the working efficiency is improved.

The invention discloses an automatic layout method for urban development land. The method comprises the following steps of establishing an urban development land random distribution model by using an information processing system of which the core is a high performance computer, taking geographical data of urban areas as model input data and taking land use span pattern spots as a model processing unit, performing circulation calculation by using the random distribution model, and combining to generate all possible layout schemes of the urban development land through exhaustion; by taking road network density as a detection condition, automatically detecting the road network density of the urban development land in each layout scheme, and saving the layout scheme with the highest road network density; and automatically outputting an engineering drawing, which can be directly used by urban controllability detailed planning, by using plotting equipment. The method overcomes the defects of subjectivity and randomness generated because urban spatial layout is decided by intellectual activity of human brains in urban construction engineering practice.

The invention discloses an anti-polarization mixing single-path circular polarization interference and single wollaston prism splitting-type homodyne laser vibrometer, which belongs to the field of laser interference measurement. According to an interference part, circular polarization reference lights and circular polarization measurement lights with orthogonal single-path polarization directions and coincident light paths are generated through two quarter wave plates and a non-polarization beam splitter (NBS); according to a detection part, after the reference lights and the measurement lights are split, four paths of photoelectric signals with a phase difference of 90 DEG are generated via the same wollaston prism, and outstanding characteristics for suppressing nonlinear errors can be acquired in aspects of the light path structure and the principle. Four-channel homodyne orthogonal laser interference measurement can be realized, problems that polarization leakage and polarization mixing exist in the light path in the prior technical scheme, an output signal has DC bias errors and non-orthogonal errors, the measurement result has a significant nonlinear error and the like can be effectively solved, and significant technical advantages are provided in the field of ultra precision vibration measurement.

A motor grader has a control system in which the manner of controlling the blade position differs depending upon whether the blade is to be moved vertically or is to be maintained at a generally constant level and cross slope. First and second hydraulic valves control the flow of hydraulic fluid to the first and second hydraulic cylinders which raise and lower respective ends of the blade. An inclinometer provides an inclinometer output indicating the inclination of the blade along its length with respect to horizontal. The control system includes a first hydraulic cylinder position sensor for determining the extension of the first hydraulic cylinder. The control system further includes a control that is responsive to a control input specifying the desired height and cross slope of the blade, to the first hydraulic cylinder position sensor, and to the inclinometer output. The control provides valve control signals to the first and second hydraulic valves. The control provides a first valve control signal to the first hydraulic valve in dependence upon a desired height specified by the control input, and the control provides a second valve control signal to the second hydraulic valve in dependence upon the inclinometer output and upon the cross slope specified by the control input. However, when the blade is to be moved upward or downward with the retraction or extension of the first cylinder, the control provides the second valve control signal to the second hydraulic valve in dependence upon the first hydraulic cylinder position sensor such that the second hydraulic cylinder retracts and extends with the first hydraulic cylinder, maintaining the cross slope angle of the blade as a constant.

The invention relates to the technical field of a shoe tree three-dimensional data measuring device and method, in particular to a full-automatic complete shoe tree three-dimensional data measuring device and method, and aims to solve the problems that existing shoe tree three-dimensional information measuring device cannot balance three-dimensional data integrity, measuring process full automation, high three-dimensional data resolution ratio and precision and suitable measuring time well. A DLP projector is used for projecting a raster image, an industrial camera is used for collecting the raster image, a shoe tree clamp is used for clamping a shoe tree to be measured and is connected with the top end of a calibrating cylinder through a shoe tree clamp fixing base in a fastened mode, the bottom end of the calibrating cylinder is fixedly connected with a rotating shaft of an inner ring worm and gear transmission mechanism, an inner ring rotating limit switch is used for limiting rotation of the calibrating cylinder, a rotating shaft of an outer ring worm and gear transmission mechanism is fixedly connected with a side plate at one side of an inner ring frame, and an inner ring swing limit switch is used for limiting swing of the inner ring frame. The shoe tree three-dimensional data measuring device is used for measuring shoe tree three-dimensional data.

The invention aims to provide a method for measuring transmission loss of an asymmetric pipeline silencer. The method comprises the following steps: a microphone is arranged in one fan-shaped area in an inlet and outlet pipeline, and incident sound pressure and transmission sound pressure of the area are measured; and the prior step is repeated according to the number of partition boards to respectively measure the incident sound pressure and the transmission sound pressure in each fan-shaped area in the inlet and outlet pipeline, and the transmission loss is computed according to the formula disclosed in the specification. According to the method disclosed by the invention, the precision within an inlet and outlet plane wave cut-off frequency range of the conventional measurement method can be met, the silencing performance of the silencer after the frequency is higher than the inlet and outlet plane wave cut-off frequency can be precisely detected, and the problem that the acoustic performance of a large-caliber asymmetric silencer at high frequency can not be accurately forecast is solved.

The invention discloses an ion liquid polishing solution for electrochemically polishing magnesium alloy, which is prepared from the following raw materials in percentage by mass: 88-96% of depth eutectic ion liquid and 4-12% of additives. The polishing solution can be used for well polishing and leveling the magnesium alloy to achieve an effect of high brightness; besides, the magnesium alloy is environmental-friendly, naturally degradable and pollution-free.