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Narrow gap welding monitoring and welding line deviation detecting method based on infrared vision sensing
ActiveCN102814574AReduce volumeReduce power consumptionArc welding apparatusDisplay deviceEngineering
The invention discloses a narrow gap welding monitoring and welding line deviation detecting method based on infrared vision sensing and belongs to the technical field of welding. An infrared vision sensing system comprises an infrared complementary metal oxide semiconductor (CMOS) camera, a filtering system, an image collecting card, a computer, a display and the like. Narrow gap welding arc light and molten pool radiation light are used as a light source, an infrared narrow belt filtering system is used for filtering interference signals and adjusting light intensity, and the computer collects and displays a welding image obtained through the infrared CMOS camera. An image capturing window is used for capturing an image away from an arc side, the image is processed, welding line deviation information is obtained by extracting a groove single-side edge, and a real-time property of welding line deviation detecting is improved while arc noise is effectively avoided. The system is simple in formation, clear in monitored image, high in welding line deviation detecting precision, strong in anti-interference capacity and good in engineering practicality and can achieve the purposes of real-time monitoring of narrow gap welding and synchronous detecting of welding line deviation.
Owner:JIANGSU UNIV OF SCI & TECH
Flexible satellite locus linearization attitude control method based on disturbance observer
ActiveCN105468007ATracking error converges asymptoticallyEasy to implementAttitude controlDifferentiatorKinematics equations
The invention relates to a flexible satellite locus linearization attitude control method based on a disturbance observer. The invention aims at solving problems that a single locus linearization control method is poor in capability of inhibiting interference, is poorer in robustness, and does not consider external interference and the impact from flexible accessories. The method comprises the steps: employing Euler angles for describing attitudes of a spacecraft, employing an idea of equivalent disturbance, and building a flexible spacecraft dynamics and kinetics equation; solving the pseudo-inverse of a controlled object under the condition of neglecting equivalent disturbance, designing a quasi-differentiator of a specific type, and obtaining the nominal control of an expected locus; and designing a linear time varying adjuster through proportion-integration control. The method gives consideration to the influence of equivalent disturbance, designs the disturbance observer, and guarantees the asymptotic convergence of a tracking error of a flexible spacecraft. The method improves the anti-interference capability of a system, and improves the robustness of the system. The method is used in the attitude control field of flexible satellites.
Owner:HARBIN INST OF TECH
Laser lap welding gap detecting system and laser lap welding gap detecting method based on molten pool image visual sensing
ActiveCN103506756AMeet the requirements of seam trackingImprove quality and efficiencyLaser beam welding apparatusAnti jammingDisplay device
The invention discloses a laser lap welding gap detecting system and a laser lap welding gap detecting method based on molten pool image visual sensing. The detecting system is a visual sensing system and comprises a CMOS camera, a light filtering system, a secondary light source, an image capture card, a computer, a display and the like, wherein the CMOS camera has a LinLog photosensory technology. According to the detecting method, the secondary light source and emitted light of molten pools are used as light sources; plasma is filtered out by utilizing the light filtering system, and light intensity is adjusted; the computer is used for collecting and displaying molten pool images in real time, wherein the molten pool images are obtained by the CMOS camera; molten pool image edges and areas and orifice image edges and areas are extracted and calculated by utilizing a Labview image processing platform, and the quantitative relations between molten pool sizes and orifice areas and between the molten pool sizes and orifice gaps are obtained. The detecting system is simple in structure, clear in monitoring image, high in light signal detecting accuracy, strong in anti-jamming capacity, good in engineering practicability and capable of monitoring laser welding of T-type overlap joint gaps in real time.
Owner:SHANGHAI JIAO TONG UNIV
Load analysis method for four-wheel six-component road spectrum of finished automobile
InactiveCN104239734AAvoid influence of simulated load resultsSolve technical bottlenecksSpecial data processing applicationsStress conditionsDynamic models
The invention relates to a load analysis method for a four-wheel six-component road spectrum of a finished automobile. The method comprises the following steps: 1 testing a four-wheel six-component road spectrum of a finished automobile; 2 collecting the design data of the finished automobile; 3 building and adjusting a dynamic model of the finished automobile; 4 carrying out virtual iteration; 5 obtaining Z-direction displacement of a wheel center; 6 decomposing the load of the finished automobile; 7 processing the load result. The six components of four wheel centers of the finished automobile are directly measured as external road excitation input; the actual stress condition of each wheel center under the typical characteristic road excitation of test site reliability is reflected; the technical effect of obtaining the load of the finished automobile system and spare parts is realized by a virtual iteration technique and a dynamics simulation technique; the anti-fatigue performance of the finished automobile structure can be accurately predicted and optimized at the earlier stage; problem rectification of the sample automobile stage is reduced; the research and development cycle is shortened; the research and development cost is also reduced.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD
Building method for universal comprehensive models of single-rotor helicopters and turboshaft engines
InactiveCN102520620AVersatilityImprove the simulation effectSimulator controlFiltrationDynamic balance
The invention discloses a building method for the universal comprehensive models of single-rotor helicopters and turboshaft engines. The method includes the building of the non-linear models of a helicopter and an engine, the static trimming of the single-rotor helicopter and the turboshaft engine, the dynamic calculation of the single-rotor helicopter and the turboshaft engine and the actual operation solution of the single-rotor helicopter and the turboshaft engine, wherein the static trimming adopts the Levenberg-Marquarat algorithm, the dynamic calculation adopts the fourth-order Ronge-Kutta method to solve the motion equation system of the helicopter and the single pass algorithm to solve the dynamic balance equation of the turboshaft engine, and the actual operation state solution adopts a modified linear quadratic regulator algorithm to carry out helicopter solution and a cascade PID (Proportion-Integration-Differentiation) plus torque feedforward plus collective pitch compensation and torsional vibration filter method to carry out engine solution and load filtration. The method can meet the test requirements of the universal models and control methods of the single-rotor helicopters and the turboshaft engines, and plays an active role in helping to shorten the development cycle and reduce the test risk and the cost.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Secondary device integration and joint debugging method based on virtual machine
ActiveCN107346917AImprove comparison efficiencyStrong engineering practicabilityCircuit arrangementsInformation technology support systemSmart substationComputer science
The invention provides a secondary device integration and joint debugging method based on a virtual machine. The method comprises the steps that S1 the minimum test system of an intelligent substation is built according to the principle of guaranteeing the substation consistency; S2 the real test environment of the substation is built based on the minimum test system; by importing an SCD file, the configuration of the devices of the whole substation is acquired; data flows including SV flow and GOOSE flow in each device are acquired; the model of the whole substation is built through backstage, and the information of the devices of the whole substation is scanned; and S3 the minimum test system is used to integrate the device information and the definition and definite value of action behaviors to acquire a test item, a test program and a test result template. The factory-like joint debugging efficiency is improved. The joint debugging intelligent level is enhanced. The device debugging cycle is shortened, and the debugging environment is improved.
Owner:JIAXING HENGCHUANG ELECTRIC POWER DESIGN & RES INST CO LTD +1
Step stress accelerated degradation data assessment method based on gray prediction models
InactiveCN102629300AOvercoming the shortcomings of the linearization assumptionImprove forecast accuracySpecial data processing applicationsModel parametersAssessment methods
Disclosed is a step stress accelerated degradation data assessment method based on gray prediction models, which includes five steps: step one: performing primary process and conversion to test data to obtain data series of performance degradation volume of each test sample under each stress level; step two: building prediction models through gray prediction, calculating model parameters, and testing prediction accuracy of each model; step three: calculating the time when each sample reaches a degradation threshold Df under a stress level Sa to obtain life distribution types of samples and general parameters under each stress level; step four: finding relationship equations between general parameters and stress levels, namely, acceleration equations; and step five: estimating product general distribution parameters under normal stress levels through extrapolation methods according to the acceleration equations, and obtaining product reliability functions under normal use conditions according to the estimated values of general parameters. According to the assessment method, gray system fitting product degradation path is utilized so that defects of other models are overcome and the prediction accuracy is improved.
Owner:BEIHANG UNIV
Industrial scale ultrasonic automatic scanning and imaging detection device
ActiveCN102411032AAuto scanReduce complexityMaterial analysis using sonic/ultrasonic/infrasonic wavesAviationBlind zone
The invention belongs to a nondestructive detection technology and relates to an industrial scale ultrasonic automatic scanning and imaging detection device used for large-scale structures made of composite materials and metal materials in the fields of aviation, aerospace, electronics, weapons, ships, metallurgy, iron and steel, transportation, construction and the like. The detection device comprises an ultrasonic automatic scanning system, an ultrasonic automatic scanning control and imaging system and a multi-channel ultrasonic system. The design according to the invention adopts a multi-axis parallel numeric control upward floating type super-static steady scanning mechanism and an ultrasonic flexible self-adaptive tracking array acoustic scanning technology, thereby greatly improving the ultrasonic automatic scanning and imaging detection efficiency and the imaging quality of the large-scale structures, realizing the industrial scale high-efficient ultrasonic automatic scanning and imaging detection of the large-scale structures made of the composite materials and the like in different specifications and enabling the detection resolution and a surface blind zone to achieve 0.13mm; and when 20 channels are detected, the efficiency is improved by at least 50 times compared with the manual scanning detection efficiency, and is improved by 20 times compared with the traditional single-channel ultrasonic automatic scanning detection.
Owner:BEIJING AERONAUTICAL MFG TECH RES INST
Method for restoring organophosphorus pesticide contaminated soil
InactiveCN105478457APollution is stable and thoroughTake full advantage of the long-acting releaseContaminated soil reclamationStrong acidsOrganophosphorus pesticides
The invention belongs to the field of soil improvement, and specifically relates to a method for restoring organophosphorus pesticide contaminated soil. The method comprises the two phases of conditioning and stacking-decomposing, and chemical oxidation, wherein the phase of conditioning and stacking-decomposing comprises the following steps: 1) adding a strong-base medicament; 2) adding surfactant aqueous solution into soil prepared in the step 1); and 3) hermetically stacking the soil in the step 2) for 2-7 days; and the phase of chemical oxidation comprises the following steps: 4) adding a strong oxidant into the soil obtained in the phase of conditioning and stacking-decomposing; 5) preparing a strong acid into aqueous solution and adding the aqueous solution into the soil in the step 4), and rapidly stirring simultaneously to enable the soil to be weak-acidic finally; and 6) hermetically stacking the soil subjected to the adequate stirring treatment in the step 5), keeping the humidity of the soil and maintaining for 1-3 days. The restoration process of combining conditioning and stacking-decomposing with chemical oxidation, which is disclosed by the invention, is more stable and thorough compared with the method of restoring organic contaminated soil through simply and directly adopting chemical oxidation.
Owner:天津环科立嘉环境修复科技有限公司
Landslide MIMO radar monitoring system and monitoring method
ActiveCN104991249AFast data collectionAdjustable arrayRadio wave reradiation/reflectionTime delaysData acquisition
Owner:GUILIN UNIV OF ELECTRONIC TECH
Motor controller based on parameter self-tuning and control method thereof
ActiveCN104993764AGood motor control performanceImprove performance index requirementsElectronic commutation motor controlVector control systemsSelf-tuningWheelchair
The invention discloses a motor controller based on parameter self-tuning and a control method thereof, and relates to the field of motor control system devices. According to the motor controller based on parameter self-tuning and the control method thereof, the control parameters of a PID controller are self-tuned by identifying the rotational inertia of a system ahead of time and converting a controlled system into a first-order inertia link and a second-order inertia link. Thus, the motor controller and the control method have higher engineering practicability. The controller has good motor control performance, and can self-tune the control parameters. Thus, the optimal parameters of a motor control system can be obtained, and the motor control system can adapt to more complex conditions and meet the requirement of users for high performance index. The motor controller and the control method are of great theoretical research value and engineering practical significance. The motor controller and the control method can be widely used in intelligent wheelchair control, unmanned lawn mowers, industrial automation, air defense, and other industries.
Owner:JIANGXI HONGDU AVIATION IND GRP
Early identification method of potential landslide based on remote sensing technology
InactiveCN108459318AReduce human and material resources inputReduce the cost of early identificationElectromagnetic wave reradiationRadio wave reradiation/reflectionSensing dataRadar
The invention discloses an early identification method of potential landslide based on the remote sensing technology, and the method comprises the following steps: S1, obtaining remote sensing data, landform data and geological data of a projection region; S2, extracting a landslide development factor and a value range; S3, building a landslide factor set standard unit; S4, building a model, and dividing a landslide development high-risk region; S5, carrying out the differential interferometer radar remote sensing monitoring of the landslide development high-risk region, extracting the deformation and crack information of the high-risk region, and achieving the early recognition of the potential landslide. The method can achieve the early recognition of the potential landslide in a large range, achieves the focusing of a key region, breaks the point measurement range of a conventional method, achieves the area monitoring recognition, can greatly reduce the manpower and material resource investment, remarkably reduces the early recognition cost of the potential landslide, and improves the project operation safety and disaster prevention and disaster mitigation level.
Owner:CHINA RAILWAY DESIGN GRP CO LTD
Moonlet sun array life forecast method based on I-V curve and energy balance
InactiveCN102928714AAvoiding the Limitations of Lifespan PredictionSimplify complexityPhotovoltaic monitoringPhotovoltaic energy generationNatural satelliteSpace environment
The invention provides a moonlet sun array life forecast method based on I-V curve and energy balance. Aiming at the problems that the existing moonlet sun array life forecast method has few damage regularity space environment influencing factors, is limited in life forecast of unit cells to the large extent, cannot forecast the whole life of a sun array, and the like, the moonlet sun array life forecast method is based on space environment simulation tests, and a sun array integral life forecast module is provided taking important space environment factor influence including sun and earth distance factors, track earth shadow time, included angles of sun rays and sun array normals, temperature and sun radiation into account, further the problem of generality of life forecast taking the sun array important life influence factors into account and sun array integral life forecasting suitable for different bathes and different types is solved. The I-V curve is a current and voltage curve of a solar unit cell. The moonlet sun array life forecast method is based on tests, and has good model generality and strong engineering practical applicability.
Owner:BEIHANG UNIV +2
Aluminum body lightweight design method based on sensitivity and CAE analysis
InactiveCN106844874AStrong engineering practicabilityImprove guidanceGeometric CADInternal combustion piston enginesOptimal designDesign objective
The invention discloses an aluminum body lightweight design method based on sensitivity and CAE analysis. The method comprises the following steps of 1, building an aluminum body finite element model; 2, analyzing modality and rigidity of an aluminum body; 3, building a sensitivity analysis optimization response model; 4, calculating a rigidity sensitivity coefficient, a modality sensitivity coefficient and a weight sensitivity coefficient of all components of the aluminum body; 5, according to a calculation result of the sensitivity coefficient, performing structural optimal design; 6, performing CAE analysis validation on the optimized aluminum body structure, judging whether the lightweight design objective is met or not; if yes, completing designing; if not, executing the step 5 again till the lightweight design objective is met. All structures capable of achieving the lightweight objective in the whole aluminum body structure can be analyzed, it can be efficiently verified that the optimized structure meets the requirement for modality and rigidity or not, and the efficient and reliable aluminum body lightweight design is achieved.
Owner:SUZHOU AUTO TECH +1
Simple cascading camera chain measuring method and system for monitoring multipoint settlement
ActiveCN104316024AAvoid complex workStrong engineering practicabilityHeight/levelling measurementComputer graphics (images)Engineering
The invention relates to an automatic simple cascading camera chain monitoring method and system. The system is formed by serially connecting a plurality of measuring units, wherein each measuring unit consists of a camera and a cooperation mark which is fixedly connected with the camera. A measuring unit is arranged at each position to be measured in the region along the line, each settlement to-be-measured point is connected with a plurality of settlement known control points, the camera is required to simultaneously photograph two cooperation marks on the left side or the right side in the measuring process, and the settling volume of each mark and pitch angle of each camera can be directly calculated by virtue of the fixed connection constraint of the camera and the mark in each measuring unit and the geometric constraint relation of each homonymous mark imaging of adjacent cameras. According to the method, one camera only needs to be fixedly connected with single mark point and the relation between the camera and the mark point does not need to be calibrated, thereby avoiding the complicated operation for precisely determining the relative relation among multiple cameras and between the cameras and the fixedly connected multiple control points. The method can be used for automatically monitoring the settlement of roadbeds, bridges and the like and has important theoretical research significance and wide application prospect.
Owner:NAT UNIV OF DEFENSE TECH
Multi-beam imaging sonar sidelobe suppression method and array sparsity method
InactiveCN105842702AReduce running timeImprove computing efficiencyGenetic modelsAcoustic wave reradiationLocal optimumThermodynamics
The invention discloses a multi-beam imaging sonar sidelobe suppression method. Via use of a wind-driven optimization algorithm, an optimal array element position suitable for all wave beam directions is searched; via use of a convex optimization algorithm, an optimal weighting coefficient suitable for all wave beam directions is calculated; an array sidelobe is suppressed, possibility of optimization searching processes being trapped in local optimum is greatly reduced, and sidelobe suppression effects are improved. The invention also discloses a multi-beam imaging sonar array sparsity method, via use of an iteration sparsity method based on a mixed algorithm, a multi-beam sidelobe peak value level is suppressed via optimization of array element position arrangement and the weighting coefficient on a precondition that requirements for main sidelobe performance are given, array sparsity is realized on the premise that no big directional diagram performance loss is caused, and good engineering practicality is achieved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Strong resistance and strong evasion floor heave governing construction method of high-stress large-deformation soft rock drift
InactiveCN103206224AImprove stress distributionHigh pressureUnderground chambersTunnel liningReinforced concreteRebar
The invention discloses a strong resistance and strong evasion floor heave governing construction method of a high-stress large-deformation soft rock drift, belonging to the technical field of coal mine drift support. The strong resistance and strong evasion floor heave governing construction method is designed for solving the problems of large deformation and difficult support of the floor heaves of coal mine soft rock drifts. Certain depth is firstly dug downwards on a drift soleplate from a designed elevation, and then, a high strength deformed steel bar anchor rod, a grouting anchor rod, a steel beam and a concrete layer are used for supporting the drift soleplate to form a strong resistance supporting structure, a layer of aerated rubber air bags containing rubber granules is paved on the strong-resistance supporting structure, the air bags are used as strong evasion devices to release the pressure of the soleplate and buffer the deformation of the floor heave, and finally, a layer of reinforced concrete is poured on the rubber air bags to control the floor heave of the high-stress large-deformation soft rock drift. According to the invention, resistance is combined with evasion, the construction technique is simple, the construction speed is high, the repair rate low, the method is generally suitable for governing the floor heaves of various kinds of coal mine drifts and chambers, and the engineering practicability is strong.
Owner:SHANDONG UNIV OF SCI & TECH
Method for estimating jump cycle and take-off time of frequency hopping signal
InactiveCN103746722AStrong robustnessStrong engineering practicabilityBaseband system detailsPeak valueFrequency characteristic
The invention discloses a method for estimating the jump cycle and the take-off time of a frequency hopping signal. The method comprises the following steps: step one: obtaining a data sequence; step two: initializing parameters; step three: calculating the power spectrum of data in the i-th short-time window; step four: estimating the peak frequency and the peak-to-average power ratio of the data in the short-time window through the power spectrum; step five: judging whether the processing for the data of all short-time windows is completed, if the processing is not completed, returning to the third step, and if the processing is completed, returning to the sixth step; step six: estimating the initial moment of each jump of the frequency hopping signal; step seven: utilizing an alpha-TM algorithm to estimate the jump cycle and the take-off time. The method simultaneously utilizes the frequency characteristics and the energy features of the frequency hopping signal, and the robustness is good; through short-time Fourier transform, the calculated amount is small, the engineering practicability is high, and the method is suitable for quick and robust estimation of the parameters of the frequency hopping signal.
Owner:SOUTHEAST UNIV
Spacecraft attitude control method for sensor under attack in space confrontation environment
InactiveCN108628331AStrong engineering practicabilityHigh control precisionCosmonautic vehiclesCosmonautic partsSpacecraft attitude controlControl system
The invention relates to a spacecraft attitude control method for a sensor under attack in a space confrontation environment. The method aims at attitude control for the spacecraft sensor under attackin a complex space environment. The method comprises the steps that first, a spacecraft attitude control system model with sensor attack and external environment interference is established; secondly, a disturbance observer is designed to estimate the external environment interference received by a system without considering the sensor attack; again, based on the external environment interferenceestimation value, an output filter and an unknown input learning observer are designed to estimate an attack signal in the sensor information; and finally, the attack signal estimation value and theexternal environment interference estimation value are combined to design a composite controller to construct the spacecraft attitude control method for the sensor under attack in the space confrontation environment. The method provided by the invention has the characteristics of high anti-interference, high reliability and high engineering practicability, and is suitable for high-precision andhigh-reliability control of the spacecraft attitude control system under the condition that the sensor information is attacked.
Owner:BEIHANG UNIV
Thrust distribution method based on combination of particle swarm and sequential quadratic programming
ActiveCN108845576AImprove search accuracyStrong engineering practicabilityPosition/course control in two dimensionsDistribution methodEngineering
The invention relates to a thrust distribution method based on combination of a particle swarm and sequential quadratic programming. The method is characterized by comprising steps that S1, current controller three-axis instructions are obtained by a thrust distribution unit from a controller, including longitudinal force, lateral force and yawing moment; S2, a thrust distribution model of a dynamic positioning system is established; S3, a target function and constraint conditions of a thrust distribution problem are established; and S4, an optimization searching method combining the particleswarm and sequential quadratic programming is applied to solve the thrust distribution problem. The method is advantaged in that on the basis of fully considering advantages and disadvantages of the particle swarm algorithm and the sequence quadratic programming algorithm, the two are combined, the disadvantages of the two can be effectively compensated, global optimization searching performance of the algorithm is greatly improved, the thrust distribution problem of the dynamic positioning system can be quickly and effectively solved, and the method has a high practical value.
Owner:TIANJIN NAVIGATION INSTR RES INST
Calculating method for power-cable magnetic-thermal coupling field
InactiveCN105184003AAddressing Magnetic-Thermal Coupling IssuesImprove capacity utilizationSpecial data processing applicationsPower cablePhysical model
The invention provides a calculating method for a power-cable magnetic-thermal coupling field. The method comprises the steps that 1, a power-cable electromagnetic field physical model and a power-cable temperature field physical model are built; 2, power-cable physical simulation models are built, and calculating parameters and boundary conditions are determined; 3, the corresponding calculating parameters are obtained by measuring a power cable; 4, an electromagnetic field and a temperature field of the power cable are solved according to the electromagnetic field physical simulation model and the temperature field physical simulation model; 5, if calculating results are convergent, the electromagnetic field and the temperature field of the power cable are obtained, magnetic-thermal coupling analysis is achieved, and if the calculating results are not convergent, iterative analysis is performed by returning to the step 4 until the calculating results are convergent. The calculating method is flexible in solving mode and very suitable for the magnetic-thermal coupling problems of processing cable loss and temperature rising.
Owner:BEIJING ELECTRIC POWER ECONOMIC RES INST +2
Grain bin pressure sensing system and grain bin reserve online monitoring and early warning system
InactiveCN105865683ARealize dynamic supervisionSimple hardware structureApparatus for force/torque/work measurementSpecial purpose weighing apparatusEarly warning systemData processing system
The invention relates to a grain bin reserve online monitoring and early warning system and a grain bin pressure sensing system. The pressure sensing system comprises a plurality of pressure sensors distributed on the bottom of a grain bin at intervals; each pressure sensor is provided with an output cable; and after vertically reaching a side wall of the grain bin, each output cable is connected with an almost-annular wall attached cable by means of an RS485 bus, then penetrates the side wall, and is connected with a data collection and transmission device outside the grain bin. The online monitoring and early warning system comprises a grain bin pressure sensing system, a data collection and transmission device and a data processing system, wherein the data collection and transmission device communicates with each pressure sensor of the grain bin pressure sensing system through an RS485 bus and a customized protocol. Based on the digital output pressure sensors, the online monitoring and early warning system can detect the current weight of a grain reserve inside the grain bin in real time and upload the data to a monitoring center, and nationwide interconnection is realized, so that dynamic supervision and early warning of all grain reserve depots can be realized.
Owner:AEROSPACE LONG MARCH LAUNCH VEHICLE TECH CO LTD +1
Fault locking method for relay protection in digital substation
InactiveCN102064613AImprove reliabilityImprove securityEmergency protective circuit arrangementsInformation technology support systemElectric power systemEngineering
The invention relates to a fault locking method for relay protection in a digital substation. In the relay protection, a plurality of IED (Intelligent Electronic Device) distributed fault detection elements are integrated with various fault identification criterions to effectively identify faults of a power system; a protection device and intelligent unit double-fault locking mechanism is adopted, wherein a process layer communication CPU (Central Processing Unit) on the protection device only releases GOOSE (Generic Object Oriented Substation Event) trip locking and forwards a GOOSE trip signal to an intelligent unit on the premise that a trip command for protecting the CPU and a fault detection FD open command exist simultaneously; and the intelligent unit only releases locking and trips on the premise that the GOOSE trip command and the FD open command are received simultaneously. On the basis of network information sharing, the fault locking method provided by the invention is integrated with various fault identification criterions to effectively identify the fault of the power system by adopting the plurality of the IED detection elements, and prevents false tripping caused by IED abnormality so as to improve the reliability of the power system.
Owner:XJ ELECTRIC +2
Sky wave radar sea clutter suppression method based on chaos sequence prediction
InactiveCN104007423AInhibition retentionStrong engineering practicabilityWave based measurement systemsLow speedReference distance
The invention belongs to the technical field of sky wave radar, and relates to a sky wave radar sea clutter suppression method based on chaos sequence prediction. The sky wave radar sea clutter suppression method based on chaos sequence prediction aims to solve the problems that in an existing sky wave radar sea clutter suppression method, due to the fact that target detection of a low-speed naval ship is not satisfactory and depends on relevance of a plurality of clutter reference distance units, engineering practicability is not high, the number of loop iteration times is difficult to select and precision is low. According to the sky wave radar sea clutter suppression method based on chaos sequence prediction, a sea clutter internal chaos dynamical model is obtained by means of a chaos predictor, sea clutters are counteracted in a non-linear prediction method, and a target signal is maintained. The method includes a training process and a work process. In the training process, internal rules of a section of sea clutter signals without a target or with a weak target signal are learnt by means of the predictor; in the work process, prediction and counteraction of the sea clutters are achieved by means of signals of a target unit to be detected via the well trained predictor, and accordingly target information is displayed. The method is suitable for sky wave radar.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Multi-source target tracking measurement system and tracking method based on active vision
InactiveCN109212545ARealization of tracking measurementExpand the field of viewRadiation pyrometryElectromagnetic wave reradiationLaser rangingImaging processing
The invention belongs to the technical field of image processing, and relates to a multi-source target tracking measurement system and tracking method based on active vision. The system comprises a photoelectric assembly and a stable platform, wherein the photoelectric assembly is composed of a visible light camera, an infrared thermal imager, a laser range finder, an information processor and a photoelectric cabin structure; the visible light camera, the infrared thermal imager, the laser range finder and the information processor are all installed inside the photoelectric cabin structure; the stable platform consists of an orientation motion assembly, a pitching motion assembly and a control assembly; and the control assembly receives an instruction sent by the information processor, andcontrols the orientation motion assembly and the pitching motion assembly to enable visual axes to stably point to a target. The invention further provides the multi-source target tracking method based on the active vision. The orientation motion assembly and the pitching motion assembly are driven to rotate according to the control instruction, so that the visual axis of the visible light cameraand the visual axis of the infrared thermal imager point to the target, and the target is always kept in the center of a shot image.
Owner:CHANGSHA CHAOCHUANG ELECTRONICS TECH
Integrated error calibrating method of SINS/DVL (strapdown inertial navigation system/doppler velocity sonar) combined navigation system
InactiveCN103389115AThe measurement accuracy is not highSolve the problem of poor stability of conventional least squaresMeasurement devicesSingular value decompositionCarrier system
The invention relates to an integrated error calibrating method of an SINS / DVL (strapdown inertial navigation system / doppler velocity sonar) combined navigation system. The integrated error calibrating method comprises the following steps: obtaining a first navigation distance component of a carrier relative to a DVL instrument coordinate system and a second navigation distance component of GPS (global position system) position information relative to a carrier system in real time; carrying out least square fit based on SVD (singular value decomposition) on the first navigation distance component and the second navigation distance component, so as to obtain an SINS / DVL integrated conversion matrix; judging whether the conversion matrix estimated in the step 2 meets the accuracy requirement, and if not, repeating the steps 1 and 2 until the fitting precision achieves the requirement of navigation. By adopting the on-line estimation method of the least-square installation deviation angle based on the SVD, provided by the invention, the installation deviation angle of the DVL / IMU (doppler velocity sonar / inertial measurement unit) is estimated by adopting a GPS track measurement and DVL sliding track fitting method; not only is the problem of poor conventional least square stability solved; meanwhile, the integrated error calibrating method is low in demand on the measurement accuracy of z GPS, easy in scheme implementation and strong in engineering practicability.
Owner:HARBIN ENG UNIV
Frame-type circuit breaker fault diagnosis and degree evaluation method based on operating accessory current
ActiveCN107219457ASolve the kernel function selection problemSolve choice problemsCircuit interrupters testingSupport vector machineEngineering
The invention relates to a frame-type circuit breaker fault diagnosis and degree evaluation method based on operating accessory current. The method includes the steps of firstly determining the working stages, including an energy storage stage, a closing stage and an opening stage, of the circuit breaker to be diagnosed and evaluated, then using the current of an energy storage motor to diagnose fault during the energy storage stage, and using the current of a closing coil to diagnose fault during the closing stage, using the current of the opening coil to diagnose fault and assess degree during the opening stage, respectively detecting the current signals of the energy storage motor during the energy storage stage, the current signals of the closing coil to diagnose fault during the closing stage and the current signals of the opening coil during the opening stage, conducting fault diagnosis with a multi-core support vector machine, and accurately determining the fault degree through a fault degree characteristic curve when the degree of the fault diagnosed has to evaluated.
Owner:HEBEI UNIV OF TECH
Calculating and analyzing method for resonance characteristics of direct current circuit of high-voltage direct current power transmission
InactiveCN103544377ACalculate ImpedanceEffectively analyze resonance risksElectric power transfer ac networkSpecial data processing applicationsTime domainResonance
The invention relates to a calculating and analyzing method for resonance characteristics of a direct current circuit of high-voltage direct current power transmission. The calculating and analyzing method for the resonance characteristics of the direct current circuit of the high-voltage direct current power transmission comprises the following steps of (1) setting up a direct current circuit resonance model, wherein according to a direct current system needing to be researched, system parameters are input in an EMTDC simulation model, a direct current circuit equivalent simplified simulation model is established; (2) setting a unit surge voltage source; (3) determining working conditions of researches; (4) carrying out time-domain simulation; (5) analyzing impedance characteristics; (6) analyzing resonance characteristics; (7) verifying power frequency and secondary power frequency; (8) carrying out simulation verification on the influences of failures and disturbances on direct current circuit resonance; (9) analyzing the calculation conclusion. According to the calculating and analyzing method for the resonance characteristics of the direct current circuit of the high-voltage direct current power transmission, the direct current circuit impedance under different frequencies can be calculated accurately, the response conditions of the power frequency and the response conditions of the secondary power frequency can be analyzed more accurately, and the calculating and analyzing method has strong operability and engineering practicability.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Car body light-weight design method
PendingCN108804857AMeet the stiffness requirementsReduce weightGeometric CADDesign optimisation/simulationElement modelBody weight
The invention relates to a car body light-weight design method. The method comprises the steps of building a car body finite element model; 2, building a car body modal, bending and torsional rigidityanalysis model, and calculating and obtaining modal, bending and torsional rigidity values; 3, building a sensitivity analysis model and performing solution calculation; 4, performing finishing according a sensitivity analysis model calculating result, obtaining a sensitivity analysis result of a car body metal plate corresponding to the design variable; 5, building a car body light-weight optimizing calculation model, and performing solution calculation; 6, performing extraction on the calculation result, and modifying a thickness value of some metal plates so as to meet the requirement forengineering, and forming a novel BOM table; 7, judging whether the BOM table reaches a light-weight design target or not, if yes, completing designing, and if not, repeatedly executing the step 6 tillthe light-weight design goal is reached. Compared with the prior art, the requirement for the car body rigidity is met effectively, the car body weight is lowered, the high engineering practicabilityis achieved, and the applicability is high.
Owner:SHANGHAI COTECH AUTOMOTIVE ENG CORP LTD
Intelligent lifting type forced road speed bump
ActiveCN105839555ASolve hidden safety problemsEnsure safetyTraffic signalsRoad signsSpeed bumpEngineering
The invention discloses an intelligent lifting type forced road speed bump. The forced road speed bump comprises an intelligent vehicle speed detecting and judging system, a power supply module, a lifting drive device, a step-shaped iron lifting platform, two sliding blocks, two springs and two protective cylinder sleeves, wherein the lifting drive device is connected with the step-shaped iron lifting table and controls lifting of the step-shaped iron lifting platform; the two sliding blocks are mounted on two sides of the upper part of the step-shaped iron lifting platform respectively, energized spiral armatures are arranged in the sliding blocks, and the two sliding blocks are connected with the two protective cylinder sleeves through the springs respectively; the energized spiral armatures and the lifting drive device are connected with the intelligent vehicle speed detecting and judging system respectively; the intelligent vehicle speed detecting and judging system is connected with the power supply module. The vertical barrier height of the speed bump is controlled through two times of intelligent detection and judgment of vehicle speed, forced speed reduction and warning are performed on overspeed vehicles, the safety and the taking comfort of running vehicles based on speed limit regulations are guaranteed, and potential safety hazards caused by traffic disturbance in person and vehicle mixed road sections and particularly vehicles' violation of speed-limit standards are prevented.
Owner:HUNAN UNIV OF SCI & TECH
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