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47results about How to "Engineering is easy to implement" patented technology
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Airship radar conformal thinned array antenna and its signal processing method
ActiveCN103682677AImproving Real Aperture Imaging ResolutionEasy for large-scale sparse layoutWave based measurement systemsAntenna arraysThinned arrayActive phase
The invention discloses an airship radar conformal thinned array antenna and its signal processing method. The conformal thinned array antenna comprises a plurality of sparsely-distributed subarrays on a ship body. The subarrays adopt active phase control subarrays, and a rigid structure is adopted to guarantee subarray face control precision. A receiving / transmitting assembly of the subarrays is a stereoscopic integrated tile structure with radiation array elements. Each subarray transmits and receives frequency division or code division orthogonal signals so as to realize a full-array transmit-receive function. Observation scope of the conformal thinned array antenna is determined by subarray antenna beamwidth. High spatial resolution is realized by full-array antenna. The airship radar with the conformal thinned array antenna is used for high-resolution ground imaging and moving object detection.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Multi-deformable mirror control method based on separation mode control and optimization algorithm
ActiveCN102722023AGet rid of dependenceSimple structureOptical elementsManufacturing technologyMode control
The invention relates to a multi-deformable mirror control method based on separation mode control and an optimization algorithm. By utilizing an influence function and a wavefront distortion mode of a deformable mirror, a control response equation used for optimizing an interference signal and a deformable mirror driving signal by adopting the optimization algorithm mode is established, and a wavefront distortion mode required to be corrected and correcting value are reasonably allocated for each deformable mirror. When the optimization algorithm is executed, target light distribution is taken as an evaluation function, the evaluation function and light beam quality are taken as the same criterion, and closed-loop control is carried out on each deformable mirror by adopting the light beam quality evaluation method, so that light beam criterion reaches up to the extreme value and effective control on the multi-deformable mirror is realized. The multi-deformable mirror control method disclosed by the invention has a simple system structure, the correction mode of each deformable mirror can be reasonably distributed, a wavefront correction stroke is effectively increased by adopting the existing deformable mirror manufacturing technology, and the multi-deformable mirror control method disclosed by the invention has expandability.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
EIS rapid measuring method of lithium-ion battery
InactiveCN106970266AFast testShort test timeResistance/reactance/impedenceElectrical testingVoltage amplitudeChemical reaction
The invention relates to an EIS rapid measuring method of a lithium-ion battery, and provides an EIS rapid measuring method based on square wave current excitation and Fourier transform. The method includes: selecting a square wave excitation frequency based on an electrochemical reaction characteristic of the lithium-ion battery, determining that the lithium-ion battery is in an appropriate polarized voltage amplitude range, and selecting a sinusoidal alternating current amplitude according to the range; applying a square wave current of a selected frequency point and with a specific amplitude to the lithium-ion battery, performing Fourier transform on the square wave current and a response voltage obtained by sampling, and obtaining the impedance of a specific frequency point; and screening the impedance with a specific frequency based on a frequency spectrum amplitude of Fourier decomposition of the response voltage and an impedance change rule to form the electrochemical impedance spectroscopy of the lithium-ion battery, namely EIS. According to the EIS rapid measuring method, the electrode reaction characteristic of the lithium-ion battery can be accurately described, the EIS of the lithium-ion battery is accurately obtained, the EIS test speed of the lithium-ion battery is fast, the test time is short, and the project is easy to realize.
Owner:BEIJING JIAOTONG UNIV +1
Threaded interference fitting method and threaded interference fitting structure for turbine impeller and rotary shaft
ActiveCN103244194APersistent and reliable connectionGuaranteed connection strengthBlade accessoriesMachines/enginesImpellerAluminium alloy
The invention relates to a threaded interference fitting method and a threaded interference fitting structure for a turbine impeller and a rotary shaft. Through reasonable design of a threaded connecting structure and process diameters of a titanium aluminum turbine impeller and a 42CrMo rotary shaft, machining of titanium aluminum turbine impeller inner threads and a titanium aluminum turbine impeller matching end face and 42CrMo rotary shaft outer threads and a 42CrMo rotary shaft matching end face, threaded assembling of the titanium aluminum turbine impeller and the 42CrMo rotary shaft is achieved by heating a threaded connecting part of the titanium aluminum turbine impeller or cooling a threaded connecting part of the 42CrMo rotary shaft, blind holes of connected turbine rotary shafts are machined, elastic cylindrical pins are fitted in the blind holes, and other parts of the connected turbine rotary shafts are machined according to structural parameters of turbine rotary shafts. The advantages of threaded connection and interference fitting are combined, durable and reliable connection of the titanium aluminum alloy turbine impeller and 42CrMo alloy rotary shaft, and the connection strength requirements of the booster turbine impeller and the rotary shaft are satisfied.
Owner:CHINA NORTH ENGINE INST TIANJIN
Equivalent range equation based SAR (synthetic aperture radar) ground motion target imaging method
InactiveCN103293520AQuality improvementSimplify the imaging processRadio wave reradiation/reflectionSynthetic aperture sonarTransformer
The invention discloses an equivalent range equation based SAR (synthetic aperture radar) ground motion target imaging method. The equivalent range equation based SAR ground motion target imaging method includes: subjecting a ground motion target to being equivalent to a static target by means of the equivalent range equation and building an equivalent signal model; subjecting target signals to Fourier transform in range and direction and transforming the signals to a two-dimensional field; matching filter in range of the two-dimensional field; performing inverse Fourier transform in range and correcting range migration; matching filter in direction; performing inverse Fourier transformer in direction and completing motion target imaging. The motion target is equivalent to the static target, the motion target is imaged by means of a static target imaging method, the problems that target direction is defocused and direction sidelobe is asymmetric in the prior art are solved, and the target can be imaged in high quality. The motion target can be imaged by the static target imaging technology, imaging of the motion target is simplified, and the equivalent range equation based SAR (synthetic aperture radar) ground motion target imaging method is easy to implement on engineering and can be used for an onboard SAR-GMTI (ground motion target imaging) to image the ground motion target.
Owner:XIDIAN UNIV
Sliding mode attitude control method for quadrotor UAV based on proportional integral observer
InactiveCN109521786AImproving Steady State Tracking AccuracyImprove robustnessAttitude controlAdaptive controlElevation angleDynamic models
The invention discloses a sliding mode attitude control method for a quadrotor UAV based on a proportional integral observer. The method comprises steps that a dynamic model of the quadrotor UAV withinterference only is established, and expressions of a rolling angle, an elevation angle and a yaw angle of the quadrotor UAV are transformed into second-order system models; the second-order system models are utilized to construct the corresponding proportional integral observer; a sliding mode attitude controller is designed according to the proportional integral observer, and the sliding mode attitude controller in combination with the rolling angle, the elevation angle and the yaw angle is utilized for flight control of the quadrotor UAV. The method is advantaged in that the proportional integral observer is combined with the sliding mode attitude controller, the partial feedback function of the proportional integral observer is utilized to estimate the shape and position input interference state of the quadrotor UAV, steady state tracking accuracy of the proportional integral state observer is improved, through the sliding mode attitude controller, relatively strong robustness andanti-interference to uncertain factors of the quadrotor UAV are achieved, and design and calculation are simple.
Owner:NANJING UNIV OF POSTS & TELECOMM
Identification method for lumped thermal parameters of lithium ion battery
ActiveCN107069131AIdentifying thermal parameters of lithium-ion batteries is simple and reliableEngineering is easy to implementSecondary cellsRC time constantTest battery
The invention discloses an identification method for lumped thermal parameters of a lithium ion battery. The identification method for the lumped thermal parameters is based on an lumped thermal equivalent circuit and special signal stimulation and by combination with a mathematical algorithm; according to the method, temperature rise of the battery is simulated based on the lumped thermal equivalent circuit; a thermal time constant in the environment is obtained by a temperature change experiment; a functional relation between impedance and temperature is established according to impedance at different temperatures; and by applying sine alternating current with single frequency and amplitude, relatively high accuracy of a battery thermal model is ensured; according to a battery temperature rise model and the functional relation between impedance and temperature, temperature change of the battery under special stimulation is circulated; and an actually-tested battery temperature is approached through a search iterative algorithm, so as to identify specific heat capacity and heat resistance of the battery. According to the method, complex test equipment, such as a heat insulating calorimeter, an isothermal calorimeter and other expensive thermal test equipment are not needed; and in addition, the method has the advantages of simplicity and reliability in identifying thermal parameters of the lithium ion battery, easy realization of engineering and the like.
Owner:BEIJING JIAOTONG UNIV +1
Bionic polarization sensor multi-source error calibration method based on adaptive EKF (Extended Kalman Filter)
ActiveCN109556633AImprove robustnessImprove anti-interference abilityNavigational calculation instrumentsKaiman filterState model
The invention relates to a bionic polarization sensor multi-source error calibration method based on an adaptive EKF (Extended Kalman Filter). The method comprises the following steps that: (1) on thebasis of installation errors, scaling factors, polarization degree coefficients, polarization azimuthal angles and polarization degrees, establishing a system state model for a polarization navigation system quantity of state; (2) taking a light intensity measurement value which contains a multisource error as an output to establish a system measurement model; (3) designing an adaptive extended Kalman filter to estimate the installation errors, the scaling factors and the polarization azimuthal angles; and (4) according to the estimation values of the installation errors and the scaling factors, compensating a polarization sensor measurement value which contains the multisource error. The method disclosed by the invention has the advantages of being high in robustness and antijamming capability and being easy in engineering implementation.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
System wave aberration detection method capable of calibrating system errors
InactiveCN106292202APlay the role of filteringEliminate aberrationsPhotomechanical exposure apparatusMicrolithography exposure apparatusWave aberrationLighting system
The invention provides a system wave aberration detection method capable of calibrating system errors. The system wave aberration of a projection objective to be detected is subtracted from the system errors of a shear interference detection system to obtain the actual wave aberration of the projection objective to be detected, the influence of the system errors is eliminated, and measuring accuracy is improved. A filtering function can be achieved by a small hole space filter, aberration caused by a lighting system and a first convergence lens can be eliminated, and detection accuracy of the system wave aberration is improved. Only + / - level diffraction light can pass a window in the space filter, zero and higher level diffraction light is intercepted by the space filter, so that noise is reduced, and measuring precision is improved.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
High-altitude-airship horizontal position control method based on characteristic model
ActiveCN105912025AEngineering is easy to implementMaintain high precisionAdaptive controlPosition/course control in three dimensionsCycle controlGeneralized inverse
The invention discloses a horizontal position control method based on a characteristic model. The method comprises the following steps of firstly, based on motion model analysis in a horizontal plane, through generalized inverse processing, acquiring a characteristic model form in which input and output are simultaneously decoupled and giving out a parameter range; and then operating a cycle control process; based on the characteristic model and the parameter range, carrying out on-line identification and acquiring a characteristic parameter estimation value; based on the characteristic parameter estimation value, designing a controller and calculating to acquire a control law; carrying out generalized interference estimation and estimating generalized interferences of two channels in the horizontal plane; carrying out coupling and conservative distribution processing and calculating to acquire an execution mechanism command; carrying out detection, configuration and decoupling processing, and calculating actual control amounts of the two channels. The control method adopts combination of adaptive combination control and generalized interference compensation based on the characteristic parameter estimation value so that simultaneous decoupling of the input and output is realized and maintenance precision of the horizontal position under the condition that a wind field changes randomly is increased.
Owner:BEIJING INST OF CONTROL ENG
Aircraft simulation air bearing table inertia regulating and measuring device and method
InactiveCN105203259AThe principle is simpleEasy to install and maintainStatic/dynamic balance measurementMeasurement deviceAir bearing
The invention provides an aircraft simulation air bearing table inertia regulating and measuring device and method. The device comprises a base, an air bearing pair, an experiment table top, two trusses, under-table hanging bins and truss inertia regulating modules; the experiment table top is installed on the air bearing pair, the trusses are installed on the two sides of the experiment table top, the under-table hanging bins are installed under the experiment table top, and the truss inertial regulating modules are installed on the trusses; the trusses are symmetrically installed on the two sides of the experiment table top. The method comprises the steps that rough regulating is performed, a theoretical calculation mode is adopted, inertia predistribution is performed on a computer design model, and balancing weights with the appropriate specification are selected or replaced and installed on the truss inertia regulating modules; when the balancing weights are installed, the balancing weights need to be installed in pairs at discs arranged at the two ends of the trusses; rotary inertia of a system is measured; the calculated rotary inertia is compared with an expected set value, and mass blocks are increased and decreased in pairs at the discs arranged at the two ends of the trusses. The aircraft simulation air bearing table inertia regulating and measuring device and method are suitable for measurement of air bearing table rotary inertia, simple in principle and convenient to install and maintain.
Owner:HARBIN INST OF TECH
Micro-nano satellite multi-source information attitude determination method capable of being applied in whole on-orbit course
PendingCN110285815ASmall amount of calculationImprove fault toleranceInstruments for comonautical navigationHigh level techniquesMicro nanoProcess noise
The invention provides a micro-nano satellite multi-source information attitude determination method capable of being applied in the whole on-orbit process. The method comprises the following steps of calculating an information distribution factor alpha i, and adaptively resetting a process noise variance matrix Qi and a filtering process estimation error covariance matrix Pk-1, i to a local filter S1 and a local filter S2 at the same time, wherein subscript i = 1 and 2 respectively corresponds to two local filters; the information distribution factor alpha i = r 1 + r 2 / ri, wherein a formula (shown in the description) represents elements of the nth row and the mth column of the estimation error covariance matrix Pi, k-1 at the moment k-1; and realizing multi-source information attitude estimation of the micro-nano satellite by utilizing the self-adaptively reset Qi and Pk-1, i. According to the invention, a self-adaptive idea is added to form a self-adaptive federal Kalman filtering algorithm, so that the attitude determination requirement of a micro-nano satellite adopting a plurality of low-cost, small-volume and low-power-consumption miniature sensors is realized.
Owner:SHANDONG INST OF AEROSPACE ELECTRONICS TECH
Simplified robust self-adaptive pitching-reduction control method for multi-hulled ship
ActiveCN109334892AImprove comfortEasy programmingVessel movement reduction by foilsAdaptive controlCouplingState observer
The invention discloses a simplified robust self-adaptive pitching-reduction control method for a multi-hulled ship. A heaving and pitching coupled movement model of the multi-hulled ship is established and converted into a state space form, and the heaving and pitching coupled movement model is decomposed into a heaving movement model and a pitching movement model which are decoupled; according to the heaving movement model and the pitching movement model which are decoupled, expansion state observing devices are separately designed and used for estimating movement states and coupling items of the multi-hulled ship; by combining the steps, the virtual controlling quantity is obtained by integrating the basic controlling quantity of the multi-hulled ship and the estimated coupling items, and the virtual controlling quantity is distributed to attack angles of T-shaped wings and a spray strip. Variation of the heaving height and the pitching angle of the multi-hulled ship is controlled through force and moment generated by the attack angles. The control method is simple, reliable and easy to realize, and can effectively achieve the purposes that heaving of the multi-hulled ship is reduced by 20%-35%, and pitching of the multi-hulled ship is reduced by 40%-50%.
Owner:JIANGSU UNIV
Differential positioning method for ground-based augmentation system based on extended Kalman filtering
InactiveCN108549097AAccurate judgmentEngineering is easy to implementSatellite radio beaconingCarrier signalAugmentation system
The invention discloses a differential positioning method for a ground-based augmentation system based on extended Kalman filtering. The differential positioning method comprises a carrier phase smoothing pseudorange step and a differential positioning step based on extended Kalman filtering. The carrier phase smoothing pseudorange step is implemented by judging whether a carrier phase has a cycleslip according to a carrier difference. The differential positioning step based on extended Kalman filtering is implemented by establishing a position velocity and acceleration (PVA) model, and estimating the optimal real-time position of an aircraft by means of an extended Kalman filter. The differential positioning method can effectively solve the problems of poor positioning precision caused by random errors such as user-side noise and multipaths of the ground-based augmentation system (GBAS) on the basis of carrier phase smoothing pseudorange and Kalman filter data smoothing advantages.
Owner:THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Airborne radar space and ground moving target classification and recognition method
InactiveCN105629210ALess constraintsEngineering is easy to implementWave based measurement systemsRadarRecognition algorithm
The invention belongs to the airborne radar target classification and recognition technical field and relates to a fractal and phase modulation characteristic-based airborne radar space and ground moving target classification and recognition method. The target classification and recognition algorithm provided by the invention can be realized under a narrow band working mode, and a large quantity of instantaneous bandwidth is not required, so that excessively many resources do not need to be consumed. The additional providing of a target classification and recognition function can be realized possibly under the condition that an airborne radar has miniaturization, multi-function multi-task, multiple-working mode and multi-target tracking requirements, and excessive consumption of radar resources usually has little possibility of being realized on the airborne radar. The recognition results of target features can be rendered based on 100 frames of data, and classification and recognition are carried out.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
Micro gas turbine decoupling control method
ActiveCN105863850ASave adjustment timeReduce couplingClimate change adaptationEnergy efficient heating/coolingSingular value decompositionElectricity
The invention provides a micro gas turbine decoupling control method according to the characteristic that a micro gas turbine cool-heat-electricity cogeneration system can be divided into two subsystems. The pairing mode of the input quantity and the output quantity is accurately judged through an efficacy relative gain matrix, and controller design is carried out on a controlled object though a singular value decomposition decoupling method. The simulation result of coordinated control of a unit plant indicates that based on the efficacy relative gain matrix and comparing the singular value decomposition decoupling control method with a traditional PID control method, the adjustment time can be shortened, coupling is weakened, the overshoot is reduced, and accordingly the system has good dynamic and static characteristics. Compared with general decoupling control methods, the coupling elimination effect is good, calculation is easy, and the method is easy to realize in projects.
Owner:SOUTHEAST UNIV
Doppler radar assisted strapdown inertial navigation motion base alignment method and system
ActiveCN111912427AEngineering is feasibleGood effectMeasurement devicesAdaptive filtering algorithmDoppler velocity
The invention discloses a Doppler radar assisted strapdown inertial navigation motion base alignment method and system. The method comprises the following steps: acquiring a vehicle-carrying longitudinal speed output by a dual-beam Doppler velocity measurement radar; obtaining the speed and course angle output by the strapdown inertial navigation system and the vehicle carrying angular speed output by the gyroscope; according to the vehicle-carrying longitudinal speed and the vehicle-carrying angular speed, performing calculating to obtain the speed and course angle of the vehicle under the navigation coordinate system; respectively subtracting the speed and course angle output by the strapdown inertial navigation system from the calculated speed and course angle of the carrier vehicle toobtain two measurements aligned with the moving base, taking the two measurements as observed quantities, performing state estimation by adopting an adaptive filtering algorithm to obtain an estimatedvalue of the misalignment angle of the mathematical platform, and further obtaining a carrier vehicle attitude correction matrix; and correcting the attitude matrix of the strapdown inertial navigation system to finish alignment of the strapdown inertial navigation motion base. According to the invention, rapid, high-precision and high-autonomy initial alignment of the vehicle-mounted strapdown inertial navigation system can be completed in the vehicle-mounted driving process.
Owner:ROCKET FORCE UNIV OF ENG
Singular point judgment method based on singular geometric significance of control moment gyro group
PendingCN110990943AHigh precisionImprove reliabilityGeometric CADCosmonautic vehiclesGyroscopeControl system
The invention discloses a singular point judgment method based on singular geometric significance of a control moment gyro group. The method comprises the following steps: step 1, respectively calculating a moment vector and an angular momentum vector according to a frame angle, an initial moment vector and an initial angular momentum vector; 2, calculating a quasi-singular vector according to themoment vector; 3, calculating a singular coefficient according to the quasi-singular vector and the moment vector, and judging whether the frame angle is a singular point or not; 4, if the frame angle is not a singular point, ending the judgment; If the frame angle is a singular point, calculating a judgment coefficient, judging the type of the singular point, and ending the judgment. According to the method, the problems of complex singular point judgment operation and low operation rate of different control forces for rejecting the gyro group are solved; any two moment gyroscopes in the control moment gyroscope group are selected to judge whether any frame angle of different control moment gyroscope groups is a singular point or not in a coplanar state, and the type of the singular point is determined, so that the judgment calculation amount is simplified, and the precision and reliability of a control system are improved.
Owner:SHANGHAI AEROSPACE CONTROL TECH INST
Generator power oscillation damping controller based on energy storage device
InactiveCN104037789AGood robustnessMake the most of power regulationPower oscillations reduction/preventionPower oscillationDynamo
The invention relates to a generator power oscillation damping controller based on an energy storage device. The generator power oscillation damping controller comprises two micro processing units MCU1 and MCU2, wherein the MCU1 is used for collecting input states, and the MCU2 is used for performing damping control which includes collecting the output power of generators collected by the MCU1, obtaining preset active regulating signals of the power regulation system of the energy storage device and outputting the same. The controller utilizes a nonlinear proportion-integral-differential controller to generate a power regulation command for inhibiting power oscillation of the generator, the control strategy has the characteristic of being easy to implement and the controller has the characteristic of good robustness; through the cooperative work of the two CPU, real time of the controller is effectively improved, execution cycle of the complex control algorithm is greatly shortened; other applications of the energy storage device in the electric system can also be achieved by modifying the control strategy, and the generator power oscillation damping controller has the characteristics of simple structure and easiness in implementation in engineering.
Owner:WUHAN UNIV
Reconfiguration method and reconfiguration system of relay subframes
InactiveCN105611572AImprove performanceAvoid data congestionNetwork traffic/resource managementRadio transmissionReal-time computingRelay
The invention relates to a reconfiguration method and a reconfiguration system of relay subframes, belonging to the technical field of wireless communication. The method comprises the following steps of: predicting traffic of an eNodeB and a Relay of next subframe adjusting period according to change conditions of the traffic of the eNodeB and the relay of former N subframe adjusting periods; and judging whether to increase a Un subframe or reduce the Un subframe according to the predicted traffic of a DeNB and the relay of the next subframe adjusting period, and performing reconfiguration for RN subframes according to the result, when increase of the subframes is required, selecting a subframe configuration mode capable of increasing the number of the subframes from Un subframe configuration modes corresponding to uplink and downlink configuration modes of a DeNB cell, and when decrease of the subframes is required, selecting the subframe configuration mode capable of decreasing the number of the subframes from the Un subframe configuration modes corresponding to the uplink and downlink configuration modes of the DeNB cell. Thus, configuration modes of the subframes can be adjusted according to the traffic, a problem of data congestion caused by unreasonable subframe configuration is avoided. The method and the system provided by the invention are simple and practicable, are easy to realize in engineering, and improve performance of relay nodes.
Owner:HENAN UNIVERSITY OF TECHNOLOGY
Method for improving transient error of capacitor voltage transformer
InactiveCN113156360AImprove accuracyTransient Error ImprovementElectrical measurementsTransient stateHemt circuits
The invention discloses a method for improving the transient error of a capacitor voltage transformer, and the method comprises the following steps: deducing an equivalent circuit of the capacitor voltage transformer according to the physical structure of the capacitor voltage transformer; building a transient error model of the capacitor voltage transformer; outputting a real transient error curve; connecting a virtual capacitor voltage transformer transient error compensation device in series to the secondary side of the equivalent circuit of the capacitor voltage transformer to form a virtual capacitor voltage transformer transient error model; obtaining optimal parameters of the transient error model of the virtual capacitor voltage transformer through a parameter identification method, so that a virtual transient error curve output by the transient error model of the virtual capacitor voltage transformer is most fitted and approximate to the real transient error curve; and subtracting the virtual transient error curve from the real transient error curve to improve the transient error of the capacitor voltage transformer.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Electrochemical reduction-thermochemical cycle water-splitting hydrogen production method
ActiveCN109516437AEliminate lossEngineering is easy to implementHydrogen productionChemistryElectricity
The invention relates to an electrochemical reduction-thermochemical cycle water-splitting hydrogen production method. Firstly, an electrochemical reduction process is conducted, and then a thermochemical water-splitting hydrogen production process is conducted; in the electrochemical reduction process, a cathode and an anode are adopted for ferric oxide electrolysis in a molten salt electrolyte,through electrolysis, nascent state Fe is generated, the adding amount of ferric oxide is 0.25-1.0 mol / electrolyte kg, electrolysis temperature is 450-600 DEG C, electrolysis current is 0.25-1.0 A, and electrolysis time is 10-60 min; according to the thermochemical water-splitting hydrogen production process, after the electrochemical reduction process is completed and a power supply is cut off, water is introduced into a vapour generator while the vapour generator discharges vapour, and the vapour is introduced to the cathode in an electrolytic tank for water-splitting hydrogen production reaction; the water input is 0.1-1.0 mL / min. According to the electrochemical reduction-thermochemical cycle water-splitting hydrogen production method, water-splitting hydrogen production is conducted at 500 DEG C, so that the problem of a material at high temperature is solved.
Owner:GUANGDONG UNIV OF PETROCHEMICAL TECH
An identification method for lumped thermal parameters of lithium-ion batteries
ActiveCN107069131BIdentifying thermal parameters of lithium-ion batteries is simple and reliableEngineering is easy to implementSecondary cellsTest batteryEngineering
The invention discloses an identification method for lumped thermal parameters of a lithium ion battery. The identification method for the lumped thermal parameters is based on an lumped thermal equivalent circuit and special signal stimulation and by combination with a mathematical algorithm; according to the method, temperature rise of the battery is simulated based on the lumped thermal equivalent circuit; a thermal time constant in the environment is obtained by a temperature change experiment; a functional relation between impedance and temperature is established according to impedance at different temperatures; and by applying sine alternating current with single frequency and amplitude, relatively high accuracy of a battery thermal model is ensured; according to a battery temperature rise model and the functional relation between impedance and temperature, temperature change of the battery under special stimulation is circulated; and an actually-tested battery temperature is approached through a search iterative algorithm, so as to identify specific heat capacity and heat resistance of the battery. According to the method, complex test equipment, such as a heat insulating calorimeter, an isothermal calorimeter and other expensive thermal test equipment are not needed; and in addition, the method has the advantages of simplicity and reliability in identifying thermal parameters of the lithium ion battery, easy realization of engineering and the like.
Owner:BEIJING JIAOTONG UNIV +1
A method of horizontal position control of high-altitude airship based on characteristic model
ActiveCN105912025BEngineering is easy to implementMaintain high precisionPosition/course control in three dimensionsAdaptive controlCycle controlGeneralized inverse
Owner:BEIJING INST OF CONTROL ENG
A method and system for reconfiguring relay subframes
InactiveCN105611572BImprove performanceAvoid data congestionNetwork traffic/resource managementRadio transmissionTrunkingEngineering
Owner:HENAN UNIVERSITY OF TECHNOLOGY
Vehicle-mounted heading and attitude system error compensation method and system based on motion constraints
InactiveCN111829555AImprove completenessGet rid of dependenceMeasurement devicesIn vehicleEngineering
The invention relates to a vehicle-mounted heading and attitude system error compensation method and system based on motion constraints. The method comprises the following steps of establishing a system state equation of error compensation filtering based on an error model of an attitude and heading system,establishing a measurement equation of error compensation filtering based on a vehicle motion constraint condition,according to the system state equation and the measurement equation, determining an optimal estimation result of the attitude error of the mathematical platform of the attitudeand heading system,and performing error online compensation on the vehicle-mounted heading and attitude system according to the optimal estimation result. Thus, long-time high-precision attitude determination can be realized in various complex severe environments, especially in battlefield environments.
Owner:中国人民解放军火箭军工程大学
Sliding mode control method used for permanent magnet synchronous motor and capable of realizing adjustable stabilization time
PendingCN113708685AGood anti-interference performanceMotor speed drop is smallElectronic commutation motor controlAC motor controlSliding mode controlComposite controller
The invention discloses a design method of a sliding mode controller with adjustable stabilization time, and the sliding mode controller is used for speed regulation control of a permanent magnet synchronous motor. The method mainly comprises the following steps of: step 1, based on a vector control strategy, realizing decoupling of a speed loop and a current loop, and establishing a mathematical model of the speed loop by adopting a command control method; step 2, designing a speed loop controller of the permanent magnet synchronous motor by using a sliding mode control algorithm with stable preset time; and step 3, introducing a disturbance observer to carry out feed-forward compensation on the basis of the sliding mode controller which stable preset time so as to reduce buffeting of the control system. The control method provided by the invention not only can enable the system state to converge to a balance point within a preset time T, but also can improve the inherent buffeting problem of a traditional sliding mode control method, and the final composite controller has good tracking precision and anti-interference performance.
Owner:JIANGSU UNIV
A Simplified Robust Adaptive Pitch Control Method for Multihull Vessels
ActiveCN109334892BImprove comfortEasy programmingVessel movement reduction by foilsAdaptive controlClassical mechanicsVirtual control
The invention discloses a simplified robust self-adaptive pitching-reduction control method for a multi-hulled ship. A heaving and pitching coupled movement model of the multi-hulled ship is established and converted into a state space form, and the heaving and pitching coupled movement model is decomposed into a heaving movement model and a pitching movement model which are decoupled; according to the heaving movement model and the pitching movement model which are decoupled, expansion state observing devices are separately designed and used for estimating movement states and coupling items of the multi-hulled ship; by combining the steps, the virtual controlling quantity is obtained by integrating the basic controlling quantity of the multi-hulled ship and the estimated coupling items, and the virtual controlling quantity is distributed to attack angles of T-shaped wings and a spray strip. Variation of the heaving height and the pitching angle of the multi-hulled ship is controlled through force and moment generated by the attack angles. The control method is simple, reliable and easy to realize, and can effectively achieve the purposes that heaving of the multi-hulled ship is reduced by 20%-35%, and pitching of the multi-hulled ship is reduced by 40%-50%.
Owner:JIANGSU UNIV
Conformal sparse array antenna for shipborne radar and signal processing method thereof
ActiveCN103682677BImproving Real Aperture Imaging ResolutionEasy for large-scale sparse layoutWave based measurement systemsAntenna arraysThinned arrayEngineering
The invention discloses an airship radar conformal thinned array antenna and its signal processing method. The conformal thinned array antenna comprises a plurality of sparsely-distributed subarrays on a ship body. The subarrays adopt active phase control subarrays, and a rigid structure is adopted to guarantee subarray face control precision. A receiving / transmitting assembly of the subarrays is a stereoscopic integrated tile structure with radiation array elements. Each subarray transmits and receives frequency division or code division orthogonal signals so as to realize a full-array transmit-receive function. Observation scope of the conformal thinned array antenna is determined by subarray antenna beamwidth. High spatial resolution is realized by full-array antenna. The airship radar with the conformal thinned array antenna is used for high-resolution ground imaging and moving object detection.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Vehicle-mounted high-precision fault-tolerant integrated navigation method and system
ActiveCN112461236AHigh precisionImprove reliabilityInstruments for road network navigationNavigational calculation instrumentsIn vehicleRadar
The invention relates to a vehicle-mounted high-precision fault-tolerant integrated navigation method and system. The method comprises the following steps: based on the attitude output of a strapdowninertial navigation system, the distance increment output of a speedometer and the speed output of a Doppler radar, respectively designing a vehicle loading position calculation algorithm and a speedcalculation algorithm in a geographic coordinate system; researching error models of the odometer and the Doppler radar, and respectively establishing error models of the position calculation and thespeed calculation; using indirect method filtering for integrated navigation design, using strapdown inertial navigation system errors, odometer errors, Doppler radar errors and the like as system states, and subtracting the position and the speed output by strapdown inertial navigation from corresponding information obtained through position calculation and speed calculation respectively to serveas measurement, and designing a filtering algorithm of high-precision fault-tolerant integrated navigation by adopting Kalman filtering. According to the invention, accurate navigation of the vehiclecan be realized, and high navigation precision can still be maintained when one device of the odometer or the Doppler radar breaks down.
Owner:中国人民解放军火箭军工程大学
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