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42results about How to "Solve the difficulty of selection" patented technology
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Photovoltaic array fault detection method based on Grubbs criterion and outlier
ActiveCN107395121ATroubleshootingReduce false detection ratePhotovoltaic monitoringPhotovoltaic energy generationPower flowReference current
The invention discloses a photovoltaic array fault detection method based on Grubbs criterion and outlier. The photovoltaic array fault detection method based on Grubbs criterion and outlier includes the steps: A, acquiring the real-time current and voltage of each string of a photovoltaic array and the irradiation and temperature of the photovoltaic array every 5 seconds; B, establishing a photovoltaic array simulation model, brining the acquired irradiation and temperature into the model to obtain the reference current and voltage; C, making a difference between the practical current and the reference current, forming one array through combination of the difference of each string of the photovoltaic array, detecting the abnormal data point through application of the Grubbs criterion, and recording the fault characteristic value of the abnormal data as 1, or recording the fault characteristic value of the abnormal data as 0; D, forming a one-dimensional array through combination of the current difference every 20 seconds in order, obtaining LOF of each current difference through application of an outlier algorithm, and distributing the LOF factor to each string according to the time; and E, according to the results of the step C and the step D, comprehensively determining whether a fault occurs. The photovoltaic array fault detection method based on Grubbs criterion and outlier can detect the fault of a photovoltaic assembly in real time, especially the early fault.
Owner:HOHAI UNIV CHANGZHOU
Double-wall pipe ventilation system of LNG power ship
ActiveCN112031954AReduced risk of spills into the engine roomEasy dischargeInternal combustion piston enginesFuel supply apparatusMarine engineeringGas leak
The invention provides a double-wall pipe ventilation system for an LNG power ship. The double-wall pipe ventilation system for the LNG power ship comprises a first ventilation air inlet pipeline, a flow meter, a first double-wall pipe, a second double-wall pipe, fuel gas equipment, a fuel gas inlet pipeline, a GVU valve set, a pneumatic adjustment valve, a second ventilation air inlet pipeline, afirst exhaust fan and a ventilation air outlet pipeline. According to the double-wall pipe ventilation system for the LNG power ship, the double-wall pipes are arranged in a cabin to supply gas to the fuel gas equipment, and the risk that the gas leaks into the cabin is reduced through the good protection function of the double-wall pipes. The exhaust fan is arranged to conduct mechanical exhauston the annular space in the double-wall pipes, the negative pressure state of the annular space is maintained, and it is guaranteed that once gas leaks, the gas can be exhausted out of the ship at the highest speed.
Owner:SUNRUI MARINE ENVIRONMENT ENG
A power supplying system for a magnetic bearing and a control method thereof
ActiveCN108167330ASolve the problem of control stabilitySo as not to damageApparatus without intermediate ac conversionAc-ac conversionMagnetic bearingBusbar
A power supplying system for a magnetic bearing and a control method thereof are disclosed. The system includes a rectifier filter circuit (1), a power acquiring circuit (9) and a DC-DC power supply (2), wherein the rectifier filter circuit (1) performs rectification and filtration treatment on an alternating current input power source to obtain a first direct-current busbar voltage; then the first direct-current busbar voltage is divided into two parts; one part supplies power to a motor controller (5) of a motor (6) of the magnetic bearing; the power acquiring circuit (9) acquires power fromthe other part of the first direct-current busbar voltage to obtain a second direct-current busbar voltage; the second direct-current busbar voltage is in an allowable input voltage range of the DC-DC power supply (2); and the DC-DC power supply (2) converts the second direct-current busbar voltage into a third direct-current busbar voltage and supplies power to a bearing controller (4) of the magnetic bearing (3). The system and the method can overcome poor power supply stability, a complex structure, poor reliability, and other defects in the prior art, and achieve good power supply stability, a simple structure and good reliability.
Owner:GREE ELECTRIC APPLIANCES INC +1
Method for inhibiting induction voltage and current of 750kV parallel single-line construction line
ActiveCN103078313ASolve the difficulty of selectionSolve the selection problemAc network circuit arrangementsLarge distanceAlternating current
The invention relates to a method for inhibiting an induction voltage and an induction current of a 750kV parallel single-line construction line. Two large-distance parallel and single-line construction 750kV alternating current transmission lines are coupled on an off-the-line line to generate a higher induction voltage and a higher induction current to ensure that the problem of difficult equipment selection caused by exceeding the turning on or off capacity of the existing 750kV earthing switch is solved. The invention provides a transposition and phase sequence arrangement mode to ensure that levels of the induction voltage and the induction current applying the measure are remarkably reduced and are lower than the requirement on technical parameters of the existing equipment, and thus the equipment selection problem is solved.
Owner:PLANNING EVALUATION CENT SHAANXI ELECTRIC POWER +2
High temperature lepidolite hydrothermal treatment method for producing lithium hydroxide
ActiveCN108163874AHigh recovery rateLow recovery rateLithium oxides/hydroxidesEnvironmental resistanceLithium hydroxide
The invention discloses a high temperature lepidolite hydrothermal treatment method for producing lithium hydroxide. The method comprises following steps: step one, carrying out mechanical activation;step two, preparing raw materials; step three, carrying out preheating reactions; step four, performing hydrothermal reaction; step five, carrying out leaching and concentration; step six, removing salt: cooling concentrate at a temperature of 20 to 30 DEG C, and stirring the concentrate for 60 to 90 minutes to carry out crystallization to obtain a coarse product of lithium hydroxide. The methodhas the advantages of low energy consumption, cleanness, environmental friendliness, low cost, and high leaching efficiency, and is a novel method for fixing fluorine of lepidolite and leaching valuable metals. High temperature hydrothermal reactions are adopted to improve the burning performance of materials, and the problems that lepidolite is hard to melt at a high temperature and HF gas is generated during the melting process are solved. Moreover, the lithium conversion rate is largely improved at a proper temperature during a proper period, the technology is simpler, the material flux issmall during the production process, the recovery rate of lithium and alkali metals is high, and valuable metals are fully utilized.
Owner:江西云威新材料有限公司
Circuit breaker operation loop
The invention discloses a circuit breaker operation loop, for tripping switching-off and switching-on control and loop monitoring. An operation power source controlling a circuit breaker is generally applied to alternating currents or direct currents; the circuit breaker operation loop comprises multiple parallel-connected branches; at least one of the branches is provided with a direct current relay and a rectifier bridge connected in series with the loop of the direct current relay; and the circuit breaker operation loop further comprises a self-adaptive loop. By using the circuit breaker operation loop, switching-off and switching-on current self-adaptive and voltage type relays can be converted to current relays, and the problem of difficulty in selecting the model of switching-off and switching-on loop current relays is solved. According to the circuit breaker operation loop, through reasonable structural design of a circuit, the circuit breaker operation loop can be generally applied to both an alternating current power source and a direct current power source, and self-adaptation of switching-off and switching-on currents is realized.
Owner:ZHUHAI UNITECH POWER TECH CO LTD
Pipeline system, venturi fertilizer applicator type selecting method, and applications thereof
ActiveCN109247114ASolve the difficulty of selectionSolve the problem of difficulty in absorbing fatLiquid fertiliser regulation systemsPressurised distribution of liquid fertiliserSoil typeEngineering
The invention discloses a pipeline system, a venturi fertilizer applicator type selecting method, and applications thereof, and belongs to the field of water fertilizer integration. The venturi fertilizer applicator type selecting method comprises following steps: based on on-site factors, an irrigation device matching the on-site factors is selected, wherein the irrigation device comprises certain characteristic parameters, the on-site factors comprises one or a plurality of factors selected from crop, soil type, and irritation rules; based on the characteristic parameters, the working flowamount of the pipeline system and the outlet flow amount of a venturi fertilizer applicator contained by the pipeline system are determined, so that the venturi fertilizer applicator is determined based on the working flow amount of the pipeline system and the outlet flow amount of the venturi fertilizer applicator. The venturi fertilizer applicator type selecting method is capable of solving problems in the prior art that venturi fertilizer applicator type selecting is difficult, and fertilizer absorption is difficult to realize, time and cost are saved greatly, and it is beneficial for waterfertilizer integration high efficiency utilization.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
Power unit bypass protection device
ActiveCN106300272ASolve the difficulty of selectionSolve the costEmergency protective circuit arrangementsSpecific modelPower unit
The invention provides a power unit bypass protection device. A common mechanical switch is used to replace a mechanical-type rapid switch with a specific model. Thyristors V1 and V2 are arranged, and a first voltage division circuit and a second voltage division circuit are arranged too. When a power unit has a fault, through driving a thyristor V3 in the first voltage division circuit to be conducted, the thyristor V1 is controlled to be conducted, or through driving a thyristor V4 in the second voltage division circuit to be conducted, the thyristor V2 is controlled to be conducted. Before a switch K2 is closed, the thyristor V1 or the V2 achieves an effect of carrying out short circuit on the fault power unit so as to remove the fault power unit from a flexible direct current power transmission system. After the switch is closed, the switch bypasses the fault power unit. Because response time of the thyristor is less than response time of the common mechanical switch, through using the thyristor, failure response time can be shortened to a nanosecond level so that problems that component type selecting is difficult and cost is high are solved.
Owner:TBEA SUNOASIS +2
Pipeline and preparation method thereof
PendingCN108253202ASolve the difficulty of selectionImprove impermeabilityCorrosion preventionPipe elementsInternal pressureStructural engineering
The invention relates to the field of pipelines for delivering fluid such as water and oil and discloses a pipeline and a preparation method thereof. The pipeline comprises a concrete pipe (1) and a metal pipe (2) arranged outside the concrete pipe (1) in a sleeving mode. A radial gap is formed between the concrete pipe (1) and the metal pipe (2). The two ends of the concrete pipe (1) and the twoends of the metal pipe (2) are connected to form a cavity. A grouting layer (3) is formed in the cavity. The concrete pipe (1) is squeezed by the grouting layer (3) and the metal pipe (2) to form circumferential prepressing stress. The pipeline provided by the invention can bear high internal pressure and high external pressure, has good permeability resistance and durability and is low in manufacturing cost.
Owner:BEIJING INST OF WATER
Multi-objective particle swarm inversion method for data of magnetic method
InactiveCN105260771ASolve the difficulty of selectionResolve dependenciesBiological modelsGlobal optimizationComputer science
The invention provides a multi-objective particle swarm inversion method for the data of the magnetic method, wherein the regularized inversion problem is converted into the multi-objective optimization problem. According to the method, firstly, a multi-objective inversion solution set for the data-fitting process and the model-restricted process is solved out simultaneously based on the global optimization method. After that, the relative importance degrees of both the data-fitting process and the model-restricted process are weighed, and then an inversion result is optimally selected out of the inversion solution set. In this way, the factor regularization effect is realized. According to the technical scheme of the invention, the difficult selection problem of regularization factors and the dependence problem of initial models are solved at the same time. Compared with the conventional regularization inversion method wherein only one inversion result is obtained, feasible solutions are obtained as much as possible and then an inversion solution set can be obtained based on the above method. Therefore, the geophysical research personnel can better understand the inversion process through analyzing the solution set, and can also flexibly evaluate and select solutions in the two aspects of the data-fitting process and the model-restricted process. As a result, a result superior to that of the regularized inversion method is obtained.
Owner:YANGTZE UNIVERSITY
Optimal scheme selecting method based on distributed photovoltaic access design cluster model
ActiveCN104850716AGood clustering resultSolve the difficulty of selectionData processing applicationsSystems intergating technologiesFeature vectorState variable
The invention discloses an optimal scheme selecting method based on a distributed photovoltaic access design cluster model. The optimal scheme selecting method includes steps of defining a set of N design schemes; determining state variables indicating distributed photovoltaic design characteristics; defining state vector by the state variables indicating distributed photovoltaic design characteristics; setting up the cluster model based on information entropy, projecting the integral characteristic parameter set in design scheme space, and classifying all characteristic vectors into N types by a high-dimensional categorical data subspace cluster algorithm based on information entropy; calculating distance between characteristic vectors of a newly built photovoltaic access design model and those of the current cluster model based on the current cluster model for those newly built grid-connected photovoltaic, and selecting a category where the characteristic parameters with the smallest distance are, that is, the corresponding optimal design scheme. On one hand, an existing model database can be enriched; on the other hand, designers can be quickly instructed to select the optimal scheme.
Owner:STATE GRID CORP OF CHINA +2
Method for designing fish finder transmitter signal source
ActiveCN106501794AImprove output accuracyOutput Accuracy SimplifiedWave based measurement systemsLow-pass filterModel selection
The invention discloses a method for designing a fish finder transmitter signal source, and specifically relates to a method for designing a fish finder transmitter sine wave signal source suitable for a D-class power amplifier. The method for designing the fish finder transmitter signal source adopts a Delta-Sigma modulation technology, the generated signal source only needs to connect with a D-class digital power amplifier for amplification, and after high-frequency noise is filtered through a simple low pass filter, the signal source can restore and output sine wave signals, thereby providing for a fish finder transmitter a sin wave signal source which is capable of modulating amplitude and frequency through software and is suitable for a D-class power amplifier. The requirement for bandwidth of a power amplifier tube is substantially lowered, the problem of difficult model selection of the power amplifier tube is solved, the problem that a PWM mode causes output waveform distortion due to power amplifier tube pulse loss is avoided, and the output accuracy of the signal source is substantially improved; the design of the filter is greatly simplified; and amplitude modulation and voltage regulation output of the signal source can be realized without adding of an D / A chip.
Owner:FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
Pipeline and assembly thereof
PendingCN108253203AGood impermeability, durabilityLow costCorrosion preventionPipe protection against corrosion/incrustationMetal cylinderEngineering
The invention relates to the field of pipelines used for conveying of water, oil and the like, and discloses a pipeline. The pipeline comprises a metal cylinder (2) and a concrete cylinder (6) arranged outside the metal cylinder (2) in a sleeving manner. An elastic cushion layer (3) is arranged between the metal cylinder (2) and the concrete cylinder (6). The pipeline can bear high inner pressureand high outer pressure, good permeability resistance and durability are achieved, and the cost is low.
Owner:BEIJING INST OF WATER +1
Heat dissipation system of amphibious armored vehicle
InactiveCN111927611AAddress cooling needsReduce resistanceLiquid coolingCoolant flow controlExpansion tankFresh water
The invention discloses a heat dissipation system of an amphibious armored vehicle, and belongs to the technical field of vehicle heat dissipation. The heat dissipation system comprises three-path circulations of a fresh water path, a seawater path and an oil path, and the three-path circulations are separately circulated through a fresh water pump, a seawater pump and an oil pump to drive coolingmedia to circulate; under the land working condition, the fresh water path circulation and the oil path circulation work simultaneously, and the seawater path circulation does not work; and under theoffshore working condition, the fresh water path circulation, the oil path circulation and the seawater path circulation work simultaneously. The fresh water path circulation is provided with an expansion water tank which is used for balancing the pressure of the system water side and the exhaust and water supplement of the system. According to the heat dissipation system, the heat sources of thevehicle are classified according to different cooling media, then heat dissipation components are circularly built according to the characteristics of the marine and onshore double working conditionsof the vehicle, and the heat dissipation requirements of a high-power-density engine and advanced transmission can be met.
Owner:CHINA NORTH VEHICLE RES INST
Static Offset Push-By Rotary Steerable Drilling Tool
The invention discloses a static bias backup type rotary steering well drilling tool which comprises a rotary core shaft, a non-rotary outer sleeve segment, a circuit mounting segment and a coupler mounting segment. The non-rotary outer sleeve segment, the circuit mounting segment and the coupler mounting segment are arranged on the rotary core shaft, and the non-rotary outer sleeve segment, the circuit mounting segment and the coupler mounting segment are connected in sequence in the axial direction. Segmentation design is adopted by the rotary steering well drilling tool, the structures of the segments are simpler, and mounting is more convenient. Meanwhile, a damping hole is adopted by an oil path to replace the oil inlet and oil return functions of a high pressure valve, type selection difficulty of the high pressure valve is avoided, standby pressure can be kept in a plunger type cylinder all the time, and the response speed of a rib is improved.
Owner:CHONGQING QIANWEI SCI & TECH GRP
Equivalent circuit model of supercapacitor battery and parameter identification method thereof
PendingCN113884904AEfficient identificationImprove real-time performanceElectrical testingCapacitanceElectrical resistance and conductance
The invention discloses an equivalent circuit model of a supercapacitor battery and a parameter identification method thereof. According to the equivalent circuit model of the supercapacitor battery, a negative electrode of the supercapacitor battery is equivalent to a resistance-capacitance parallel branch, a positive electrode of the supercapacitor battery is equivalent to a capacitor, a current collector, a diaphragm, electrolyte and other constituent elements are included, the resistance of the positive electrode and the negative electrode is equivalent to a series resistance, and an ohmic leakage path is approximately equivalent to an open circuit. The parameter identification method comprises the following steps: based on an equivalent circuit model, obtaining model parameters of SOC in every 10% change stage through a circuit analysis method, and solving an average value as an initial value of a recursive least square algorithm to realize parameter identification of the equivalent circuit. The parameter identification precision is high, and the real-time performance is good.
Owner:STATE GRID HUNAN ELECTRIC POWER +2
High temperature methanation device
ActiveCN102513034ADifficult connectionSolve the difficulty of selectionHydrocarbon from carbon oxidesChemical/physical processesInlet channelMethanation
The invention relates to a high temperature methanation device, which comprises a methane reactor for synthesizing methane and a heat exchanger for exchanging heat of gas exhausted by the methane reactor and is characterized in that the methane reactor and the heat exchanger are arranged in the same pressure container casing, a cooling device is arranged on a pipe, gas channels of all sections of the heat exchanger are sequentially in series connection through expansion joints with cooling devices, two ends of a cooling medium channel of each section of the heat exchanger are respectively connected with an corresponding upper collection tank and a corresponding lower collection tank, all sections of the heat exchanger are suspended in the casing through connection between drainage channels and the lateral wall of the casing and inlet channels and the lateral wall of the casing, and gaps are formed between each section of the heat exchange and the lateral wall of the casing at intervals. An outlet of the air channel of the hat exchange is communicated with an outlet of the casing. The methanation device is directly connected with a steam generation system. A waste pot and a superheater in the steam generation system are integrated, thereby resolving the problem that a steam generator and a steam superheater are difficult to choose in type.
Owner:CHINA PETROLEUM & CHEM CORP +2
Noise reduction method of narrowband active noise control system based on variable step size algorithm
ActiveCN111402854ASolve the difficulty of selectionIncrease the level of noise reductionSound producing devicesActive noise controlAlgorithmControl system
The invention discloses a noise reduction method of a narrowband active noise control system based on a variable step size algorithm, and belongs to the field of active noise control. The method comprises the following steps: constructing a narrowband active noise control system based on a VSS-FXLMS algorithm; establishing a controller coefficient estimation error updating formula and a step length updating formula of the narrowband active noise control system; deducing a dynamic difference equation of controller coefficient estimation error updating and step length updating under the sense ofstatistical average and mean square; after the system reaches a steady state, deducing a controller coefficient estimation error mean square value, and a steady state expression of a step length meanvalue and the mean square value; and simulating and verifying dynamic performance and steady-state performance analysis results of the system, and selecting user parameters for noise reduction according to the performance analysis results. Performance analysis is carried out on the system under the sense of statistical average and mean square, the rule of influence of user parameters on dynamic performance and steady-state performance of the system is revealed, and user parameter selection is guided to improve the application level of the system.
Owner:JIANGNAN UNIV
Hyperspectral image denoising method based on multi-target low-rank sparsity and space spectrum total variation
ActiveCN111062888AResolve imprecisionSolve the difficulty of selectionImage enhancementArtificial lifeImage denoisingComputer vision
The invention relates to a hyperspectral image denoising method based on multi-target low-rank sparsity and space spectrum total variation. In combination with a multi-objective optimization theory, ahyperspectral image denoising recovery problem is converted into a multi-objective optimization problem of a sparse noise image item, a low-rank clean image item and a data fidelity item in combination with a spatial-spectral total variation item. The sparse noise is modeled by using the 10 norm, and the low-rank term is modeled by using the nuclear norm. Then, the three target items are optimized at the same time through the strong optimizing capacity of the multi-target evolutionary algorithm, and the model is solved to achieve the optimal set of solutions. According to the method, the problems of inaccurate l1 norm sparsity modeling and difficulty in optimal regularization parameter selection in an existing hyperspectral image sparse denoising method can be solved, and in addition, a sub-fitness updating strategy is designed, so that the algorithm is carried out more effectively. According to the invention, the applicability and precision of hyperspectral image denoising can be effectively improved.
Owner:WUHAN UNIV
Light source structure of automotive LED headlamp
InactiveCN105135318AMeet the requirements of few typesSolve the difficulty of selectionVehicle headlampsPoint-like light sourceOptoelectronicsSingle lead
The invention provides a light source structure of an automotive LED headlamp. The light source structure comprises an LED light source I, an LED light source II, a light-reflecting bowl, an optical lens and a light barrier, wherein the light-reflecting bowl is provided with at least two or more optical centers, the LED light source I is arranged at one optical center of the light-reflecting bowl, the LED light source II is arranged at the other optical center of the light-reflecting bowl, the LED light source I and the LED light source II are staggered at an interval of the distance conforming to the size of the LED light sources, the optical lens is arranged at the position of a light outlet of the light-reflecting bowl, and the light barrier and the optical lens are linearly distributed with the optical lens as the axis. The two light sources producing luminous energy are combined, and then the unique optical lens is utilized to form an automotive optical lens assembly completely conforming to the illumination laws and regulations of the automotive headlamp, so that the few-type requirement for a single LED light source of light-distribution laws and regulations of the automotive headlamp is met, and the problem of difficult type selection is solved.
Owner:束旭初
Selecting method for optimal initial row of optical touch image
ActiveCN103034375ASolve the difficulty of selectionCalibration stableInput/output processes for data processingComputer moduleTouchscreen
The invention discloses a selecting method for an optimal initial row of an optical touch image. The functional modules comprise an optical sensor signal processing unit, an image signal interface unit, an image optimal initial row automatic adjusting unit and an optical sensor calibrating unit. The selecting method for the optimal initial row comprises the following steps of: acquiring, processing and transferring an image signal displayed on a touch screen; automatically selecting the optimal initial row of the image according to the image signal; and automatically selecting the optimal initial row of the image according to the image signal. The self-adaptive adjusting method is adopted for solving the problem that the initial row of the image is difficult to select under a complex environment. The robustness of the selecting method is remarkably improved, so that the calibration of the optical sensor is more stable; the instantaneity is strong; the extracting precision is high; and the operation is easy. When the touch screen is installed, the factors such as illumination and the like of the installation environment of the touch screen are not needed to be evaluated; and the installation environment of the touch screen is unnecessary to take into consideration. In particular under the industrial mass-production mode, the selecting method provided by the invention is easier to realize and has high mass-production efficiency.
Owner:HUAWEI TEHCHNOLOGIES CO LTD
Modularization multi-level current converter bridge arm current direction measuring device and judgment method
ActiveCN103901257AReduced insulation requirementsSolve development problemsElectronic circuit testingDirection of current indicationMicrocontrollerMicrocomputer
The invention relates to a modularization multi-level current converter bridge arm current direction measuring device and a judgment method. The modularization multi-level current converter bridge arm current direction measuring device comprises a first single chip microcomputer U1, a second single chip microcomputer U2, a first current sensor TA1, a second current sensor TA2, a first operational amplifier U3, a second operational amplifier U4, a first photoelectric coupler U5, a second photoelectric coupler U6, resistors R1-R16, a capacitor C1 and a capacitor C2. The modularization multi-level current converter bridge arm current direction measuring device has the advantages that the bridge arm current direction is indirectly judged by detecting the current situation of an internal switching tube of a submodule according to the switching tube conduction state, and the requirement for the insulating degree of the current sensors can be greatly reduced; meanwhile, power supplies of the sensors can be isolating power supplies of a submodule drive protection circuit, and a circuit does not need to be additionally arranged; the complex degree and cost of the modularization multi-level current converter bridge arm current direction measuring device can be greatly reduced according to the characteristics, and reliability can be improved.
Owner:STATE GRID CORP OF CHINA +2
A design method of fish finder transmitter signal source
ActiveCN106501794BImprove output accuracyOutput Accuracy SimplifiedWave based measurement systemsLow-pass filterModel selection
Owner:FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
A Noise Reduction Method for Narrowband Active Noise Control System Based on Variable Step Algorithm
ActiveCN111402854BSolve the difficulty of selectionIncrease the level of noise reductionSound producing devicesActive noise controlAlgorithmControl system
Owner:JIANGNAN UNIV
Wheel edge speed reducing device and brake system thereof
InactiveCN106523552ASolve the difficulty of selectionReduce manufacturing costLiquid resistance brakesGearboxesHydraulic motorModel selection
The invention discloses a wheel edge speed reducing device and a brake system thereof, and relates to the technical field of wheel edge speed reduction. The wheel edge speed reducing device comprises a first-grade straight tooth transmission mechanism, a first-grade planet speed reducing mechanism and a second-grade planet speed reducing mechanism; a power input end of the first-grade straight tooth transmission mechanism adopts multiple driving gears; hydraulic motors can supply power to the driving gears; a power output end of the first-grade straight tooth transmission mechanism adopts a driven gear; the driven gear is connected with the first-grade planet speed reducing mechanism, and transfers the power to the first-grade planet speed reducing mechanism; and the first-grade planet speed reducing mechanism is connected with the second-grade planet speed reducing mechanism, and transfers the power to the second-grade planet speed reducing mechanism. The wheel edge speed reducing device uses multiple hydraulic motors to supply the power for common driving; and multiple small hydraulic motors are adopted to replace a large hydraulic motor to drive the wheel edge speed reducing device to operate, so that the problem of difficult model selection of high-horsepower all-hydraulic bulldozer motors is solved, and meanwhile, the production cost can be largely reduced. The invention further proposes a brake system of the wheel edge speed reducing device.
Owner:SHANTUI CONSTR MASCH CO LTD
A method for positioning and segmenting parts to be measured in 3D point cloud measurement, and a scanner
ActiveCN109559346BSolve the difficulty of selectionFlexible useImage enhancementImage analysisScannerPoint cloud
Owner:XIDIAN UNIV
Selection method of optimal starting line of optical touch image
ActiveCN103034375BSolve the difficulty of selectionCalibration stableInput/output processes for data processingAuto regulationTouchscreen
Owner:HUAWEI TEHCHNOLOGIES CO LTD
Test device and calculation method
PendingCN113740750ASolve the difficulty of selectionElectrical testingMeasurement instrument housingTest batteryElectrical battery
The invention provides a test device and a calculation method. The test device is used for detecting a to-be-tested battery, and comprises a sealing box which is provided with an accommodating cavity for accommodating the to-be-tested battery, wherein the to-be-tested battery can be fixed in the sealing box; a puncture device which is fixedly connected with the sealing box, and comprises a puncture component used for puncturing the battery to be tested, wherein at least part of the puncture component is movably arranged in the containing cavity; and a data acquisition device which can acquire gas information in the sealing box, and is electrically connected with the to-be-tested battery so as to acquire voltage information of the to-be-tested battery in the accommodating cavity. According to the test device, the difficulty in model selection of the pressure release valve of the battery in the prior art is overcome.
Owner:SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
Modular multilevel converter bridge arm current direction measuring device and judging method
ActiveCN103901257BReduced insulation requirementsSolve development problemsElectronic circuit testingDirection of current indicationElectrical resistance and conductanceAudio power amplifier
The invention relates to a modularization multi-level current converter bridge arm current direction measuring device and a judgment method. The modularization multi-level current converter bridge arm current direction measuring device comprises a first single chip microcomputer U1, a second single chip microcomputer U2, a first current sensor TA1, a second current sensor TA2, a first operational amplifier U3, a second operational amplifier U4, a first photoelectric coupler U5, a second photoelectric coupler U6, resistors R1-R16, a capacitor C1 and a capacitor C2. The modularization multi-level current converter bridge arm current direction measuring device has the advantages that the bridge arm current direction is indirectly judged by detecting the current situation of an internal switching tube of a submodule according to the switching tube conduction state, and the requirement for the insulating degree of the current sensors can be greatly reduced; meanwhile, power supplies of the sensors can be isolating power supplies of a submodule drive protection circuit, and a circuit does not need to be additionally arranged; the complex degree and cost of the modularization multi-level current converter bridge arm current direction measuring device can be greatly reduced according to the characteristics, and reliability can be improved.
Owner:STATE GRID CORP OF CHINA +2
Series diode circuit
PendingCN110752838ASolve the difficulty of selectionReduce the difficulty of selectionElectronic switchingPrinted circuit non-printed electric components associationParasitic capacitanceHemt circuits
The invention provides a series diode circuit. The series diode circuit comprises a first PCB and a plurality of diodes, the plurality of diodes are arranged on the first PCB, and the plurality of diodes are sequentially connected in series through a plurality of first wires laid on the first PCB; the series diode circuit further comprises a plurality of second wires which are laid on different layers from the first wires, and the second wires are used for generating parasitic capacitance so as to carry out voltage-sharing compensation on the series diode circuit. According to the invention, the problem that the compensation capacitor of the series diode circuit is difficult to select in the prior art is solved, and the selection difficulty of the compensation capacitor of the series diodecircuit is reduced.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
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