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44results about How to "Small degree of dispersion" patented technology
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Triplex redundancy-based realization method for fly-by-light fight control system
InactiveCN102736630ASmall degree of dispersionStrong flexibilityPosition/course control in three dimensionsThree levelElectricity
The invention, which belongs to the digital control technology and flight control field, relates to a triplex redundancy-based realization method for a fly-by-light fight control system. According to the invention, three-level voting / monitoring modules are arranged, wherein the three-level voting / monitoring modules includes monitors and voters; optical signals of the sensors are converted into electrical signals that then enter voting / monitoring modules at the input terminals of computers; after flight control law calculation, the processed signals pass through the voting / monitoring modules at output terminals of the computers and then enter servers; and when the electrical signals pass through the voting / monitoring modules, the monitors remove fault channels and the voters select output from residual signals. Beneficial effects of the realization method are as follows: monitoring and fault positioning can be carried out conveniently, faults can be shielded effectively, and a dispersion degree of an inputted signal can be reduced; besides, the realization method with strong flexibility and less hardware enables the computers to work synchronously.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Medical ultrasound image speckle removing method through quantum inspiration
ActiveCN103955894AGood auxiliary effectKeep Organizational DetailsImage enhancementUltrasonographySonification
The invention discloses a medical ultrasound image speckle removing method through quantum inspiration. The method comprises the steps that a medical ultrasound image containing speckle noise is input; logarithm transformation is carried out to convert the multiplicative noise image into the additive noise image; complex wavelet transformation is carried out to convert a grey value of the image into a wavelet coefficient; noise variance, and variance and smoothing parameters of a probability density function of an ideal image signal are estimated to obtain a noise statistic model and a statistic model of the ideal image signal; an adaptive adjustment threshold value is calculated according to the theory of quantum inspiration, and soft threshold processing is carried out on the wavelet coefficient to obtain a wavelet coefficient estimation value of the ideal image signal; the wavelet coefficient estimation value of the ideal image signal is used for wavelet reconstruction to obtain the image; exponential transformation is carried out on the image to compensate the logarithm transformation in the first step, and the image with speckles removed is obtained. The method can keep organization details in the image well on the basis of effectively removing the speckle noise of the medical ultrasound image, and play a good role in assisting in medical treatment.
Owner:SUZHOU ZIGUANG WEIYE LASER TECH CO LTD
Method for obtaining reliability sensitivity of anti-icing air bleeding system under temperature fault
ActiveCN103942371AMeet the precision requirementsSmall degree of dispersionSpecial data processing applicationsSubset simulationDependability
The invention relates to a method for obtaining the reliability sensitivity of an anti-icing air bleeding system under a temperature fault. Input parameters of the system and the random uncertainty of the system parameters are processed through a system parameter probability model, a function expression between system output responses and the system parameters is fitted with a response surface method, and influences of the uncertainty of the system parameters on the system reliability are reduced; according to a subset simulation reliability analysis method, the accuracy requirement can be met with the small sampling time number, the dispersion degree is small, and the convergence speed is high; the influence degree of the system parameters on the overall reliability of the system is calculated and obtained with a reliability sensitivity analysis method, and the direction is provided for determining the optimal solution of system reliability optimization design.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method and system for establishing pulse wave noise signal identification model based on convolutional neural network
PendingCN110956197ASmall degree of dispersionStrong nonlinearityCharacter and pattern recognitionCatheterActivation functionAlgorithm
The invention discloses a method and a system for establishing a pulse wave noise signal identification model based on a convolutional neural network. The method comprises the steps of preprocessing pulse wave noise signal data; extracting features of the processed noise signal data through a plurality of convolution layers of the convolution network model; extracting key information of the processed noise signal data through a maximum pooling layer; calculating the weight of each neuron of the convolutional neural network model through a dense layer activation function; calculating the processed noise signal data through a convolutional neural network model, and outputting an identification result of the noise signal data; adjusting the weight of each neuron of the convolutional neural network model through the error of the recognition result of the noise signal data, and carrying out the repeated iterative loop training of the convolutional neural network model; and verifying the convolutional neural network model by using the unrecognized noise signal data in the processed noise signal data to obtain a verified convolutional neural network model.
Owner:OVATION HEALTH SCI & TECH CO LTD
Probability distribution-based wind farm cluster output power smoothing effect analysis method
ActiveCN106712112ASignificant smoothing effectFlat volatilitySingle network parallel feeding arrangementsWind energy generationElectricityNew energy
The present belongs to the new energy power generation technical field and relates to a probability distribution-based wind farm cluster output power smoothing effect analysis method. The method includes the following steps that: the wind power data of a wind farm are acquired and are adopted as wind electricity output power sample data; normalization processing is performed on the sample data, so that processing-post new data can be obtained; wind farm cluster output power smoothing effect indexes are obtained through calculation according to the new data; and the result of a wind farm cluster output power smoothing effect is determined according to the probability distribution of the indexes. According to the probability distribution-based wind farm cluster output power smoothing effect analysis method of the present, the three smoothing effect indexes, namely, wind electricity output power weighted probability, maximum output power simultaneity rate and average absolute fluctuation coefficient, are provided from the perspective of probability distribution; and influence on the wind farm cluster output power smoothing effect caused by different space scales can be obtained through comparison and analysis.
Owner:YUNNAN POWER GRID +1
Management method for attenuation consistency of power batteries
InactiveCN108777328ASmall dispersionEnsure consistencySecondary cells servicing/maintenanceBatteriesPower batteryUltrasound attenuation
The invention discloses a management method for the attenuation consistency of power batteries. The method comprises the following steps: measuring the corresponding relationship between each impact factor and the SOH value of a power battery in advance; during the online usage of a battery system, monitoring the SOH value of each battery cell by using a battery management system, and recording the SOH change rate, temperature, charge-discharge rate and charge-discharge cutoff voltage of each battery cell; and determining whether the SOH dispersion of the power battery is greater than preset allowable SOH dispersion, and if so, carrying out comparison based on the pre-measured corresponding relationship between each impact factor and the SOH value of the power battery and the monitored relationship between the SOH value and each impact factor in use of the power battery so as to determine main parameter factors causing the increase of the SOH dispersion and adjusting the parameter setting of each impact factor in use according to the pre-measured corresponding relationship between each impact factor and the SOH value. The management method of the invention has the advantage of capability of dynamically adjusting the parameters of the battery during the use of the battery so as to minimize the dispersion of each battery cell in the battery system as much as possible and maintainthe consistency of the battery cells.
Owner:江西优特汽车技术有限公司
Threaded fastener design method and system
ActiveCN112765737ASmall degree of dispersionReduced risk of looseningGeometric CADScrewsExperimental testingScrew thread
The invention discloses a threaded fastener design method and system, and the method comprises the steps: carrying out the calculation of a threaded fastener model, extracting the external load of a connection station through CAE, and preliminarily selecting the model of a threaded fastener through the external load; carrying out dynamic torque / clamping force and corner destructive experiments on the threaded fastener of the selected model, wherein it is tested that the surface treatment, the part size, the machining method and the assembly relation state of the threaded fastener are consistent with the loading part state; and according to experimental data, analyzing the yield point torque and the fitting torque on the test curve to obtain the installation torque or the torque + corner process. According to the method, the model selection of the threaded fastener is carried out from the stress load, then the torque / clamping force + rotation angle test is carried out through the tool state part, so that the reasonable installation torque is formulated, and the loosening risk is reduced through theoretical calculation pre-judgment and actual part test forward design.
Owner:JIANGLING MOTORS
A regional power grid load prediction method based on user electricity consumption behaviors
InactiveCN109886449ASmall degree of dispersionHigh precisionForecastingInformation technology support systemElectricityPredictive methods
The invention relates to the technical field of power systems, in particular to a regional power grid load prediction method based on user electricity consumption behaviors, which comprises the following steps of A) importing historical load data; B) carrying out normalization processing on the load data; C) constructing a sample; D) constructing a neural network; E) calculating the residual errorof the node of the last layer of the neural network; F) calculating node residual errors of all layers of the neural network except the first layer; G) obtaining a cost function value; H) obtaining the expression of the cost function with respect to the connection weight value; I) obtaining an expression of the cost function with respect to the bias; J) obtaining a connection weight value and a bias value with the minimum cost function value. The method has the substantive effects that the dispersion degree of subsequent data processing is reduced through the normalization processing of the load data, the precision of a calculation result is improved, and the accuracy of a prediction result can be improved through modeling of an improved neural network which is more suitable for power grid data characteristics.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER CO LTD QUZHOU POWER SUPPLY CO
Multi-stage thermal control logic switch based on near-field thermal radiation
ActiveCN112331765AOvercome limitationsImprove discretenessVacuum evaporation coatingSputtering coatingVacuum gapThermal radiation
The invention discloses a multi-stage thermal control logic switch based on near-field thermal radiation. The invention belongs to the field of thermal regulators. The invention aims to solve the technical problem that the existing logic thermal switch can only support the thermal Boolean operation of one signal. The multistage thermal control logic switch based on near-field thermal radiation iscomposed of a receiving end composite structure, a transmitting end composite structure and a spacer arranged between the receiving end composite structure and the transmitting end composite structure. A vacuum gap is formed between the receiving end composite structure and the transmitting end composite structure through the spacer. The receiving end composite structure and the transmitting end composite structure are completely the same and are symmetrically arranged relative to the spacer, and the receiving end composite structure sequentially comprises a receiving end substrate, a receiving end inner layer film and a receiving end outer layer film from top to bottom; and the transmitting end composite structure sequentially comprises a transmitting end outer layer film, a transmittingend inner layer film and a transmitting end substrate from top to bottom. By controlling near-field radiant heat exchange between devices, the possibility of carrying out on-off logic operation on a micro-scale is realized.
Owner:HARBIN INST OF TECH
Bounded wave intensity electromagnetic pulse simulation system
The invention provides a bounded wave intensity electromagnetic pulse simulation system. The system comprises a high-voltage pulse assembly and a waveguide type antenna connected with the high-voltagepulse assembly, wherein the tail end of the waveguide type antenna is connected with a load; the high-voltage pulse assembly comprises a direct-current high-voltage module, a charging resistor, an energy storage capacitor and an air switch which are connected in sequence, the capacitance value of the energy storage capacitor is adjustable, the air switch comprises a shell, and a first electrode and a second electrode with variable discharge gaps are arranged in the shell and filled with working gas with variable pressure intensity; the direct-current high-voltage module is used for outputtingdirect-current high voltage and compressing the direct-current high voltage into the energy storage capacitor through the charging resistor, the energy storage capacitor is used for triggering the air switch to be broken down to form corresponding voltage pulses, and the voltage pulses are transmitted to a load through the waveguide type antenna. Strong electromagnetic pulse amplitude, leading edge and pulse width output by the system are large in variation amplitude and small in dispersion degree, and the stability of the system is high.
Owner:CHINA ELECTRONICS PROD RELIABILITY & ENVIRONMENTAL TESTING RES INST THE FIFTH ELECTRONICS RES INST OF MIITCEPREI LAB
Combined steel wire straightening method and apparatus thereof
InactiveCN104128385AReduce the difficulty of adjustmentEasy to adjust ring diameterEngineeringMechanical engineering
Owner:GUIZHOU WIRE ROPE
Metal pad forming method and semiconductor structure
ActiveCN104241146AImprove performanceSmall degree of dispersionSemiconductor/solid-state device detailsSolid-state devicesSemiconductor structureMetal
The invention discloses a metal pad forming method and a semiconductor structure. The method comprises the step that a first isolation layer TaN, a second isolation layer Ti and a third isolation layer TiN are formed on a substrate, wherein metal interconnection lines are covered with the first isolation layer TaN, the second isolation layer Ti and the third isolation layer TiN. The potential of one end and the potential of the other end of a metal pad of a whole wafer tend to be consistent and are even very small in difference, the degrees of dispersion is low when reliability is tested, and the yield can be improved easily. Moreover, because the isolation layers are added, gap fill becomes easier when the metal pad is formed, and the performance of devices can be improved easily.
Owner:SEMICON MFG INT (SHANGHAI) CORP
Compression test method for honeycomb SCR catalyst
InactiveCN109187191AHighlight elasticityHighlight brittlenessMaterial strength using tensile/compressive forcesPressure curveHoneycomb
The invention relates to a compression test method for a honeycomb SCR catalyst. According to the method, a pressure test machine is used for extruding a catalyst test block at a constant speed; a pressure sensor on the pressure test machine measures a pressure value of the catalyst test block; a pressure curve is drawn by taking the time as horizontal coordinates and the pressure value as vertical coordinates; the curve is composed of a continuous elastic deformation curve S1 and a brittle deformation curve S2; pressure application is stopped after a peak value appears on the brittle deformation curve S2 in the pressure curve; and then a tangent line L1 and a tangent line L2 of the curves S1 and S2 are drawn, the tangent line L1 and the tangent line L2 are intersected, an intersection point is a threshold point of the catalyst test block, and the threshold point of the catalyst test block is defined as a compressive strength value of the catalyst.
Owner:GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
Multi-constraint-condition-oriented complex mobile crowdsourcing task decomposition method
PendingCN110503331AEliminate load imbalancesImprove quality levelOffice automationResourcesNODALTop down analysis
The invention provides a multi-constraint-condition-oriented complex mobile crowdsourcing task decomposition method, which comprises the following steps: after a mobile crowdsourcing platform issues atask demand, performing task theoretical analysis on a task, and analyzing the reseparability of the task from top to bottom; decomposing the task into a hierarchical structure tree based on a complex crowdsourcing task execution process and structure; and using the leaf nodes in the hierarchical structure tree and the corresponding relationship of the leaf nodes in the hierarchical structure tree for expressing task decomposition based on a DAG mapper. According to the method, various influence factors of complex task decomposition are more comprehensively considered; the method comprises the steps of firstly performing theoretical analysis in task decomposition, and then rationalizing task decomposition and visualizing a decomposition result, so as to realize rationality, feasibility, scientificity and interpretability of task decomposition, and realize most rationalized task decomposition and quantification of a dependency relationship between sub-tasks.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Pneumatic atomizing sprayer
PendingCN108284007AWith wind blowing effectLarge particle sizeSpray discharge apparatusWorking pressureSprayer
The invention relates to an atomizing sprayer and particularly relates to a pneumatic atomizing sprayer. The pneumatic atomizing sprayer comprises a sprayer main body and an air knife unit, wherein aliquid outlet pipeline used for spraying liquid drops is arranged on the sprayer main body; the air knife unit comprises an end cover which is mounted on the sprayer main body and an air knife assembly, an air chamber is formed between the sprayer main body and the end cover, and the air knife assembly is used for spraying gas to the end part of the liquid outlet pipeline so as to cut the sprayedliquid drops; and a nozzle used for guiding the spraying of the liquid drops and the gas is arranged at a position corresponding to the liquid outlet pipeline on the end cover. The pneumatic atomizingsprayer which does not need high working pressure can provide mists with stable particle sizes, and the system cost is low.
Owner:静快省(苏州)智能科技有限公司
Multifilament tensile test sample preparation apparatus
ActiveCN104713755AMature equipmentMature technologyPreparing sample for investigationTemperature controlFiber bundle
The invention relates to a multifilament tensile test sample preparation apparatus, an accessory mainly comprises a reinforcing part and a heating part, and the reinforcing part comprises a melt adhesive cavity, a cavity top cover and a reinforcing support, and the heating part comprises an electrical heating layer and a temperature controller outside an integral support. The sample preparation apparatus can overcome the partial disadvantage of intensity measurement by fiber bundle, problems of easy pinch-off if fiber while testing and difficult control of clamping force can be solved, difficulty of easy bending of the fiber bundle when the fiber bundle is clamped can be simultaneously solved, discrete degree of the test result is reduced, experiment credibility and experiment data accuracy can be increased, a filament stretching experiment can be carried out through the experiment equipment, result accuracy is increased, the hot melt adhesive can be used in the cavity, cycle usage of the accessory is realized, and cost is saved.
Owner:苏州赛力菲陶纤有限公司 +2
Preparation method of antibacterial UV resistant nonwoven cloth for surgery hole drape
InactiveCN108823671ASpinning process is stableGood antibacterial and anti-ultraviolet effectArtifical filament manufactureMonocomponent polyamides artificial filamentElectrospinningPolyamide
The invention discloses a preparation method of a UV resistant nonwoven cloth for a surgery hole drape. The preparation method comprises following steps: step one, mixing TiO2:(Al, Ce) powder, N,N-dimethyl acetamide, and zirconium beads, and grinding the mixture to prepare TiO2:(Al, Ce) dispersion liquid; step two, mixing polyamide and N,N-dimethyl acetamide, stirring, adding the TiO2:(Al, Ce) dispersion liquid, maintaining the temperature, and keeping on stirring to obtain a spinning solution; and step three, using the spinning solution to carry out electrostatic spinning to obtain TiO2:(Al,Ce) / polyamide nonwoven cloth, namely the UV resistant nonwoven cloth for a surgery hole drape. The prepared nonwoven cloth has a very good antibacterial and UV resistant performance.
Owner:HEFEI JIENUO MEDICAL PROD CO LTD
Modification method of porous membrane, modified porous membrane and application of modified porous membrane
The invention discloses a modification method of a porous membrane, a modified porous membrane and an application of the modified porous membrane. The modification method comprises the following steps: S1, placing a porous membrane in a pre-polymerization solution containing a monomer, and initiating a polymerization reaction through free radicals to pre-polymerize the monomer in the pre-polymerization solution on the porous membrane; and S2, removing the pre-polymerized solution, and continuing free radical-initiated polymerization reaction. According to the two-step method, firstly, the porous membrane is placed in the pre-polymerization solution to be directly prepolymerized, so that monomers in the porous membrane can be at least partially polymerized, and in the process, the provided surrounding environment of the prepolymerization liquid can enable the content of the prepolymerization liquid at different positions in porous channels of the porous membrane to be in a more full-load state; therefore, the local structure of the pore channel is more uniform; and then the porous membrane is separated from the prepolymerization solution, and the prepolymerization components in the porous membrane are further polymerized, so that the dispersion degree of the adjusted pore sizes at different positions in the porous membrane is effectively ensured to be reduced to the minimum.
Owner:ASIA REGENERATIVE MEDICINE LTD
A method for managing power battery attenuation consistency
InactiveCN108777328BSmall dispersionEnsure consistencySecondary cells servicing/maintenanceBatteriesPower batteryBattery system
Owner:江西优特汽车技术有限公司
Method for forming metal pad and semiconductor structure
ActiveCN104241146BImprove performanceSmall degree of dispersionSemiconductor/solid-state device detailsSolid-state devicesSemiconductor structureIsolation layer
The invention discloses a metal pad forming method and a semiconductor structure. The method comprises the step that a first isolation layer TaN, a second isolation layer Ti and a third isolation layer TiN are formed on a substrate, wherein metal interconnection lines are covered with the first isolation layer TaN, the second isolation layer Ti and the third isolation layer TiN. The potential of one end and the potential of the other end of a metal pad of a whole wafer tend to be consistent and are even very small in difference, the degrees of dispersion is low when reliability is tested, and the yield can be improved easily. Moreover, because the isolation layers are added, gap fill becomes easier when the metal pad is formed, and the performance of devices can be improved easily.
Owner:SEMICON MFG INT (SHANGHAI) CORP
MEMS gyroscope rapid calibration method based on recursive least square method
PendingCN113670330AEasy to operateReduce sources of measurement errorMeasurement devicesGyroscopeControl engineering
The invention relates to an MEMS gyroscope rapid calibration method based on a recursive least square method, which belongs to the technical field of gyroscope calibration, and solves the problems that an existing calibration method is tedious in process, large in calculation amount and low in efficiency. The method comprises the following steps of establishing an MEMS gyroscope error model to be calibrated, acquiring output quantities of a pitch axis, a yaw axis and a rolling axis of the MEMS gyroscope at a plurality of preset positions of the three-axis turntable, which are acquired at a preset sampling frequency within a preset time period, and generating a first group of data groups to an Nth group of data groups, obtaining a corresponding first error parameter by utilizing an MEMS gyroscope error model based on the first data group, according to the first error parameter and the second data group, acquiring a second error parameter through a recursive least square method, conducting iteration in sequence till the error parameter converges, acquiring the determined error parameter, and therefore completing calibration of the MEMS gyroscope error model. The method is simple to operate, the calibration precision is ensured, the calibration time is saved, and the calibration efficiency is improved.
Owner:BEIJING MECHANICAL EQUIP INST
Method and device for storing reverse index records
ActiveCN104537023BSmall degree of dispersionSpecial data processing applicationsObject storeReverse index
The invention discloses a storage method and device for reverse index records. The problem that magnetic disk IO is highly dispersed when reverse index records are stored in the prior art is solved. The storage method comprises the steps that after directory entries are newly built, a server obtains a first directory entry identifier of a directory entry and a second directory entry identifier of a parent directory entry of the directory entry; according to first corresponding relations between objects in a reverse index table and directory entry identifiers, an object corresponding to the first directory entry is determined as a first object storing the first reverse index record of the directory entry; according to second corresponding relations between the directory entry identifiers and storage positions of reverse index records in the objects, a storage position corresponding to the first directory entry identifier is determined as a first position for recording the first reverse index record in the first object; the first reverse index record is written in the first position in the first object, and the first directory entry identifier and the second directory entry identifier are recorded in the first reverse index record.
Owner:XFUSION DIGITAL TECH CO LTD
A Probability Distribution-Based Analysis Method for Smoothing Effect of Wind Farm Cluster Output
ActiveCN106712112BSignificant smoothing effectFlat volatilitySingle network parallel feeding arrangementsWind energy generationElectricityNew energy
The present belongs to the new energy power generation technical field and relates to a probability distribution-based wind farm cluster output power smoothing effect analysis method. The method includes the following steps that: the wind power data of a wind farm are acquired and are adopted as wind electricity output power sample data; normalization processing is performed on the sample data, so that processing-post new data can be obtained; wind farm cluster output power smoothing effect indexes are obtained through calculation according to the new data; and the result of a wind farm cluster output power smoothing effect is determined according to the probability distribution of the indexes. According to the probability distribution-based wind farm cluster output power smoothing effect analysis method of the present, the three smoothing effect indexes, namely, wind electricity output power weighted probability, maximum output power simultaneity rate and average absolute fluctuation coefficient, are provided from the perspective of probability distribution; and influence on the wind farm cluster output power smoothing effect caused by different space scales can be obtained through comparison and analysis.
Owner:YUNNAN POWER GRID +1
Method for determining cavitation bubble separation point of runner blade through external characteristic indexes
ActiveCN113094838AIncreased cavitationSmall degree of dispersionGeometric CADDesign optimisation/simulationEngineeringMechanical models
The invention discloses a method for determining a cavitation bubble separation point of a runner blade through an external characteristic index. According to the characteristics that an energy fluctuation signal at a tail water taper pipe of a hydraulic mechanical model is basically not changed along with the change of a cavitation coefficient before cavitation bubble separation of a hydraulic mechanical runner blade occurs, and the energy fluctuation signal at the tail water taper pipe of the hydraulic mechanical model is suddenly increased along with the reduction of the cavitation coefficient after the cavitation bubble separation occurs, mathematical statistical analysis on the energy fluctuation signal is carried out at the tail water taper pipe of the hydraulic mechanical model, the dispersion change of the energy fluctuation signal sequence at the tail water taper pipe of the hydraulic mechanical model under different cavitation coefficients is evaluated by a method for calculating the random uncertainty of the energy fluctuation signal at the tail water taper pipe of the hydraulic mechanical model, and the monotonicity change of the energy fluctuation at the tail water taper pipe of the hydraulic mechanical model is added, the corresponding criterion provided by the invention can be used for judging whether the cavitation bubble separation phenomenon of the hydraulic mechanical runner blade occurs or not, so that a basis is provided for predicting the service life of the runner blade.
Owner:HARBIN ELECTRIC MASCH CO LTD +2
Temperature correlation characterization method for fatigue characteristics of asphalt mixture
InactiveCN110196197AGood reproducibilityReduce test volumeMaterial strength using repeated/pulsating forcesRoad engineeringStressed state
The invention belongs to the technical field of road engineering, and discloses a temperature correlation characterization method for fatigue characteristics of an asphalt mixture. A mix proportion isdesigned for the asphalt mixture, an asphalt-aggregate ratio is determined, and a low frequency fatigue test under a different temperature is developed for the asphalt mixture under the asphalt-aggregate ratio; and a different fatigue life corresponding to the asphalt mixture under a different temperature in a simple stress state is obtained through origin fitting software, and the traditional fatigue life equation is then modified. The applicability of different fatigue test methods is analyzed from multiple angles, and a minitype beam four-point bending fatigue test is finally adopted for low-temperature and low-frequency fatigue performance. The fatigue life of the asphalt mixture is greatly influenced by a load control mode, and based on whether a load condition changes, the load is divided to simple load and composite load.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Bounded wave strong electromagnetic pulse simulation system
ActiveCN112540246BBig-amplitudeSmall degree of dispersionElectrical testingCapacitanceElectrical resistance and conductance
The present application provides a bounded wave strong electromagnetic pulse simulation system. The system includes a high-voltage pulse component and a waveguide antenna connected to the high-voltage pulse component. The end of the waveguide antenna is connected to a load; the high-voltage pulse component includes a DC high-voltage module connected in sequence, a charging resistor, an energy storage capacitor, an air switch, and an energy storage capacitor. The capacitance value of the air switch is adjustable, and the air switch includes a shell, which is provided with a first electrode and a second electrode with a variable discharge gap, and is filled with a working gas with a variable pressure; the DC high voltage module is used to output DC high voltage, and The DC high voltage is compressed into the energy storage capacitor through the charging resistor, and the energy storage capacitor is used to trigger the breakdown of the air switch to form a corresponding voltage pulse, which is transmitted to the load through the waveguide antenna. The amplitude, leading edge, and pulse width of the strong electromagnetic pulse output by the above-mentioned system have a large variation range, a small degree of dispersion, and a high stability of the system.
Owner:CHINA ELECTRONICS PROD RELIABILITY & ENVIRONMENTAL TESTING RES INST
Path optimization method for a metal droplet multilayer deposition process
PendingCN109614680ASmall degree of dispersionLow costDesign optimisation/simulationSpecial data processing applicationsStress distributionBoltzmann equation
The invention discloses a path optimization method for a metal droplet multilayer deposition process, which reduces the problem of non-uniform thermal stress distribution caused by discrete solidification time distribution and avoids deformation or failure of a sample piece after production. The method comprises the following steps: firstly, establishing a numerical model of a metal droplet multilayer spreading process by adopting a life-death unit method and a lattice Boltzmann equation; and simulating the phase change process of the metal unit in the sample piece according to the geometric structure of the sample piece and the thermophysical parameters of the material, and carrying out post-processing on the data to obtain the solidification time of each unit, and calculating the solidification time standard deviation under the deposition path scheme, and adjusting the original deposition path according to the geometric structure of the sample piece and the obtained solidification time distribution condition, repeating simulation and post-processing steps, and comparing the obtained solidification time standard deviation with the original scheme, and repeatedly adjusting the deposition path scheme to obtain an optimized path scheme according to actual production requirements.
Owner:BEIJING UNIV OF TECH
Clustering algorithm optimization method, device and equipment for network abnormal behavior detection
PendingCN114169391ASmall degree of dispersionCharacter and pattern recognitionGenetic algorithmsCluster algorithmData set
The invention discloses a clustering algorithm optimization method, device and equipment for network abnormal behavior detection. The method comprises the following steps: selecting a preset number of data points from a data set and taking the data points as initial central data points; according to each central data point, clustering processing is carried out on other data points to obtain a corresponding number of clusters, and the data points in the data set are used for representing user behaviors; respectively determining the dispersion degree of other data points in each cluster relative to the central data point of the cluster, and taking the data point corresponding to the minimum dispersion degree as a new central data point of the cluster; and carrying out clustering processing on other data points again based on the new central data point, and determining the dispersion degree again according to the new cluster until the obtained data point with the minimum corresponding dispersion degree is the same as the current central data point, and taking the data point as the optimal central data point of the cluster. Therefore, the influence of noise on clustering can be effectively reduced.
Owner:航天科工网络信息发展有限公司
Blade composite surface strengthening method
PendingCN114161322ASmall degree of dispersionSurface residual compressive stress and roughness are goodAbrasive machine appurtenancesEngineeringLeaf blade
The invention belongs to the technical field of surface strengthening, and particularly relates to a blade composite surface strengthening method. The method comprises the steps of first-time vibration finishing, blade body liquid shot blasting, blade cleaning, tenon dry shot blasting, blade body dry shot blasting, second-time vibration finishing and the like. The problems that in the prior art, after surface strengthening, the surface roughness is not good enough, the blade surface residual stress dispersion degree is large, and the fatigue life of the blade is not good enough are solved. After the method is adopted for strengthening, the dispersion degree of residual stress on the surface of the blade is smaller, the residual stress layer depth is larger, the surface residual compressive stress and roughness are better, the fatigue life of the blade is longer, combination of multiple blade surface strengthening means is achieved, the quality stability of the blade is better improved, and the service life of the blade is prolonged. And the service life of the blades and the whole unit can be prolonged.
Owner:中船重工龙江广瀚燃气轮机有限公司
Multi-stage variable-frequency network monitoring data acquisition method and device
PendingCN113114508AComprehensive dataHigh frequency of data collectionData switching networksSelf adaptiveEngineering
The invention relates to the technical field of network monitoring, and discloses a multi-stage variable-frequency network monitoring data acquisition method. The method comprises the following steps that S1, a timed scheduling module loads acquisition task information from a database to generate timed scheduling tasks with high, medium and low frequencies for each acquisition task, and generates different frequencies to facilitate scheduling. The invention further provides a multi-stage variable-frequency network monitoring data acquisition device, and the device comprises a system module assembly; the system module assembly comprises a timing scheduling module, a parallel data acquisition module, a parallel data processing module, a frequency conversion boundary calculation module and a frequency conversion control module. According to the method, the data acquisition frequency is temporarily improved when the dispersion degree of data acquired by equipment is increased or an alarm is given, and the self-adaptive capability of the acquisition frequency is reduced after a fault is eliminated or the dispersion degree of the data is reduced, so that the data acquisition efficiency, the resource utilization efficiency and the overall monitoring sensitivity of the system are effectively improved.
Owner:CHINA TELECOM SHANGHAI IDEAL INFORMATION IND GRP
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