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30results about How to "Large amount of data information" patented technology

Bridge influence line dynamic test method

The invention relates to a bridge influence line dynamic test method, and belongs to the technical field of civil engineering application. A mixed function f(x)=f1(x)+f2(x) formed by a polynomial f1(x) and amplitude tunable sine wave f2(x) is established firstly, then response of a test point is tested by experiments, and dynamic response {re} of the test point under the effect of unit moving load is obtained by an anti-inference method; and finally least square fitting is performed on the obtained dynamic response {re} of the bridge crossing test point under the unit moving load by using the mixed function f(x), and a corresponding bridge influence line is separated and extracted. Difficulty of distortion of the obtained influence line in the aspect of amplitude or shape and the like in existing bridge influence line dynamic test methods can be solved by the method, and the bridge influence line which is high in precision and can further reflect reality is obtained.
Owner:CENT SOUTH UNIV

A plant retention element experimental device for three-dimensional simulation control of water quality and quantity

The invention discloses a plant retained element experimental apparatus for water quality and water yield three-dimensional simulation control, comprising a rainwater storage tank, a water pump, a water duct, a bracket, a shower nozzle, a porous water distribution plate, a raining hole, micropore clay pipes, an elbow, water content monitoring probes, an experimental soil bin, a water outlet pipe, a sampling bottle, a desk, a plug, a runoff pipe, a suction pipe, a runoff storage groove, a water content monitor, an automatic display screen, a regulating valve and a water content induction line. A lower outlet of the rainwater storage tank is connected with a water inlet of the water pump; the water outlet of the water pump is used for conveying artificial rainwater to the shower nozzle through the water duct, wherein the shower nozzle is connected with the other end of the water pump; the artificial rainwater is uniformly sprayed in the experimental soil bin via the porous water distribution plate; the micropore clay pipe is located at the middle part of the experimental soil bin and connected with the sampling bottle via the suction pipe, and the water outlet pipe is located at the bottom of the experimental soil bin; and the regulating valve arranged on the water content monitor can selectively connect to different water content monitoring probes and simultaneously display data of the water content of the point on the automatic display screen. The experimental apparatus is simple in structure, economic and practical.
Owner:BEIJING NORMAL UNIVERSITY

Method for obtaining capsicum phytophthora resistance candidate gene and molecular marker, and application

The invention relates to a method for obtaining a capsicum phytophthora resistance candidate gene and a molecular marker, and application. The method is used for obtaining the capsicum phytophthora resistance candidate gene by utilizing capsicum phytophthora transcriptome and whole-genome sequencing data information, differentially-expressed gene identification, bioinformatics analysis, molecular marker development and phytophthora inoculation identification and belongs to the technical field of capsicum biology. The method comprises the following steps: sequencing a phytophthora resistant and susceptible gene pool transcriptome obtained after phytophthora inoculation of an F2 population constructed by capsicum highly-resistant and highly-susceptible phytophthora materials, performing expression analysis and functional annotation on differential genes, extracting DNAs (Desoxvribose Nucleic Acid) of a capsicum phytophthora highly-resistant and highly-susceptible phytophthora material genome, performing primer design and PCR (Polymerase Chain Reaction) amplification, performing sequence difference analysis and SNP site identification, performing SNP specific primer design and validity verification, and performing other steps to efficiently obtain the capsicum phytophthora resistance candidate gene and the molecular marker. According to the method, the capsicum phytophthora resistance candidate gene can be accurately identified, and the effective molecular marker can be developed.
Owner:JIANGSU ACADEMY OF AGRICULTURAL SCIENCES

Internet of Things system, Internet of Things agent device and Internet of Things agent method

The invention aims to provide an Internet of Things system, an Internet of Things agent device and an Internet of Things agent method for optimizing business of the Internet of Things, which can effectively reduce the influence of communication network delay and communication network failure on the business of the Internet of Things, meanwhile reduce the pressure of the business of the Internet of Things to the communication network, and improve the security of network data. The Internet of Things agent device provided by the invention comprises a local processing control unit, a data information processing unit and a control information processing unit, wherein the local processing control unit is used for judging whether data information needs to be processed locally according to the data information received from an Internet of Things terminal device; the data information processing unit is used for carrying out corresponding local processing on the data information when the local processing control unit judges that the local processing is needed; the control information processing unit is used for generating control information according to the result of the local processing performed by the data information processing unit and sending the result to the Internet of Things terminal device; when the local processing control unit judges that the local processing is not needed, and the data information is transmitted to a server.
Owner:HITACHI LTD

Ion thruster beam test method based on Faraday probe array

The present invention discloses an ion thruster beam test method based on a Faraday probe array which can test the ion thruster beam distribution, a beam divergence angle and a thrust vector deflection angle simultaneously. All probe test signals are acquired synchronously, the data information amount is large, and the whole test and the data processing can be finished usually in only several minutes. A shielding outer sleeve is arranged at the outer side of an ion current catch tray of each Faraday probe and is directly and electrically connected with a disc-type metal support by metal contact, so that a bias voltage can be supplied to the disc-type metal support by just one conducting wire, and the number of the probe leads is reduced substantially. When the beam divergence angle is calculated, the ion beam current density flow value of which a test current value is less than 5% of an average value is set as zero, thereby reducing a measurement error. A test point is located in the center of a small test area, the beam density measured by the test point is defined as a beam average value of the small area, thereby simplifying the calculation.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH

Ion thruster beam test system based on Faraday probe array

The present invention discloses an ion thruster beam test system based on a Faraday probe array. According to the present invention, the Faraday probes are arranged in a surface array manner, all probe test signals are acquired synchronously, the data information amount is large, and the whole test and the data processing can be finished usually in only several minutes. A shielding outer sleeve is arranged at the outer side of an ion current catch tray of each Faraday probe and is used to shield the stray ions flying to the side surface of the ion current catch tray, thereby guaranteeing that the ions are only collected on the right side of the ion current catch tray. The shielding outer sleeve is directly and electrically connected with a disc-type metal support by the metal contact, so that a bias voltage can be supplied to the disc-type metal support by just one conducting wire, and the biggest advantages of the mode are that: the number of the probe leads is reduced substantially, the structure is simplified, and the reliability is improved.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH

Myoelectric gesture recognition method based on multi-feature fusion CNN

The invention discloses a myoelectric gesture recognition method based on a multi-feature fusion CNN, and provides a feature fusion convolutional neural network architecture based on parallelism. In order to simplify the training process and reduce the dependence of a training set on the design of a specific feature set, the method is designed on the basis of a convolutional neural network architecture in a deep learning method; secondly, a parallel neural network is used for training a time domain signal and a frequency domain signal at the same time in architecture, so that the training efficiency is improved, and the training time is shortened; and in the training model, shallow data features at the initial stage of training are extracted, the shallow data features are fused with deep features at the tail end of the network, and the fused features are inputted into a classification layer for classification.
Owner:NANJING UNIV OF POSTS & TELECOMM

Data transmission method, device and system

This invention relates to a data transmission method, device and system. The method comprises the following steps: when the distance between a mobile terminal and a data device is not greater than a preset distance, receiving a device identification broadcasted by the data device in the preset distance according to a triggering command; uploading the device identification to a corresponding server of an application program; receiving corresponding webpage information looked up by the server according to the device identification; and showing the webpage information on the application program. By adopting the data transmission method, device and system, when the distance between the data device and the mobile terminal is not greater than the preset distance, the device identification broadcasted by the data device is received; the webpage information is acquired from the corresponding server of the application program according to the device identification; the device identification is acquired; the webpage data is acquired according the device identification; and thus, the large amount of the data information can be acquired.
Owner:TENCENT TECH (SHENZHEN) CO LTD

Antenna angle measurement method and system

The invention discloses an antenna angle measurement method and system. The method includes receiving data information corresponding to each target which is sent by each antenna among preset M antennas and collected by the antenna; performing Fourier transform on each target and the data information corresponding to each antenna, thereby obtaining a complex exponential of each target corresponding to each antenna; based on a relation between the complex exponential and phase, calculating the phase of each target corresponding to each antenna; and taking each target as a current target in sequence, according to preset rules, calculating a phase difference of phases of each two adjacent antennas corresponding to the current target, setting values that are larger than 180 degrees among the phase differences to be zero, calculating an average value of the nonzero phase differences, and based on a relation between phases and incident angles, calculating an incident angle corresponding to the average value, the incident angle being the incident angle corresponding to the current target. The antenna angle measurement method provided by the invention solves the technical problem of how to improve measurement accuracy of an antenna angle measurement method.
Owner:CHENGDU UNIV OF INFORMATION TECH +1

Multi-dimensional one-stop investigation method for spawning fish spawning site on grasses in large water areas of rivers, lakes and reservoirs

The invention discloses a multi-dimensional one-stop investigation method for a spawning fish spawning site on grasses in large water areas of rivers, lakes and reservoirs, and relates to a grass spawning fish spawning site investigation method. Aiming at the problems of fish spawning sites in fishery resource investigation and evaluation and fishery ecological environment protection, the invention aims to solve the problems of non-synchronous and non-timely investigation time, incomplete investigation content and no multi-dimensional investigation method in the existing investigation of spawning fish spawning sites on grasses in large water areas of rivers, lakes and reservoirs. The investigation method is implemented to form a one-stop investigation method of point-line-surface movement,multi-dimensional, omnibearing, long-distance, large-range and carpet-type search on the water surface, underwater and air, the timeliness is high, the efficiency is high, the amount of obtained datainformation is large, scientificity, systematicness and accuracy are high, and the ideal effect of synchronously, rapidly and systematically investigating and observing an investigation water area isachieved. The multi-dimensional one-stop investigation method is applied to the fishery field.
Owner:HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI

Blockchain system integration platform

The invention discloses a blockchain system integration platform, which comprises a cloud blockchain database, a block chain gateway, a data summarization module, a data summarization and an integration unit, a generation module, an establishment module, a loading module, a first wireless signal transceiving module, a data acquisition module, a data acquisition unit, a data confirmation unit, a second wireless signal transceiving module, a backup module, a cloud backup database, and a timing delete unit, the platform comprises a management module, a deletion error correction management module,a call management module, a data addition and insertion module, a management personnel authentication module, a management personnel login module, a fingerprint recognition unit, a face recognition unit, a voice recognition unit, a calling module, a management service module, a service platform, a common personnel authentication module, a common personnel login module and an authority managementmodule. The platform has a data collection function, can effectively collect and summarize data, can expand a cloud blockchain database, and increases the amount of data information.
Owner:广东奥维信息科技有限公司

A dynamic test method for bridge influence lines

The invention relates to a bridge influence line dynamic test method, and belongs to the technical field of civil engineering application. A mixed function f(x)=f1(x)+f2(x) formed by a polynomial f1(x) and amplitude tunable sine wave f2(x) is established firstly, then response of a test point is tested by experiments, and dynamic response {re} of the test point under the effect of unit moving load is obtained by an anti-inference method; and finally least square fitting is performed on the obtained dynamic response {re} of the bridge crossing test point under the unit moving load by using the mixed function f(x), and a corresponding bridge influence line is separated and extracted. Difficulty of distortion of the obtained influence line in the aspect of amplitude or shape and the like in existing bridge influence line dynamic test methods can be solved by the method, and the bridge influence line which is high in precision and can further reflect reality is obtained.
Owner:CENT SOUTH UNIV

Imaging reflective memory network shared memory data mapping correctness test method

The invention provides an imaging reflective memory network shared memory data mapping correctness test method. The imaging reflective memory network shared memory data mapping correctness test method comprises nine steps. The imaging reflective memory network shared memory data mapping correctness test method is used for performing a comprehensive test on a local-memory area read-write link, a bottom layer network protocol firmware processing link and a physical layer send-receive link in the process of shared memory data mapping performed by all nodes in a reflective memory network. Not only can a user judge the correctness of the shared memory data mapping, but also an imaging feature is achieved, and the very intuitive observation of the regularity of error codes occurring when the data mapping is wrong is achieved. The imaging reflective memory network shared memory data mapping correctness test method is strong in intuition, rich in data change and capable of better simulating the real working condition of the reflective memory network. Any node in the reflective memory network can serve as a test sending node to start a test, and the other nodes serve as test forwarding nodes to check the test result. The imaging reflective memory network shared memory data mapping correctness test method has the advantages that the flexibility is strong, the coverage is good, and the test efficiency is greatly improved.
Owner:BEIJING HSERA TIMES TECH

Optical label anti-fake method based on the pseudo-random number flow cipher

The invention provides an optical anti-fake method based on the pseudo-random number flow cipher. The personal portable smart device and the legitimate optical label device are provided with the same configuration of the pseudo random number flow cipher generator. The legitimate optical label data flow is encrypted by inputting the cipher key of the pseudo-random number flow into the generator of the pseudo-random number flow password and outputting the encrypted password flow. The optical label data information is encrypted by the pseudo-random number flow cipher, which the encryption method can be widely promoted and used with the open system and the convenient operation.
Owner:SHAANXI WHYHOW INFORMATION TECH CO LTD

A Faraday Probe Array Based Ion Thruster Beam Testing System

The invention discloses an ion thruster beam test system based on a Faraday probe array. Faraday probes are arranged in a surface array, all probe test signals are collected synchronously, and the amount of data information is large. A complete test and data processing can be completed in minutes. There is a shielding jacket on the outside of the ion current collection disk of each Faraday probe, which is used to shield the stray ions flying to the side of the ion current collection disk, so as to ensure that only the front side collects ions; the shielding jacket is directly in contact with the disc-shaped metal bracket through metal To achieve electrical connection, only one wire can be used to supply the bias voltage to the disc-shaped metal support. The biggest advantage of this method is that the number of probe leads is greatly reduced, the structure is simplified, and the reliability is improved.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH

Method for finding holes visually and forklift

The invention discloses a method for finding holes visually. The method includes the steps that a supporting plate is provided, an insertion hole is formed in the supporting plate, and the supportingplate is used for carrying goods; an image sensor is arranged on a forklift, and the forklift moves towards the supporting plate; and when the image sensor collects images of the supporting plate, forklift teeth of the forklift approach according to the position, the insertion hole located in the collected images. According to the method for finding holes visually, by collecting the images of thesupporting plate through the image sensor arranged on the forklift, the forklift teeth of the forklift can approach according to the position of the insertion hole position located in the collected images, positioning measurement is accurate, and deviation between the hole position of the insertion hole and the forklift teeth can be recognized; and due to the large amount of data information of collected videos, anti-interference ability is high, and the conditions of partial occlusion and the like are prevented from affecting positioning accuracy.
Owner:国以贤智能科技(上海)股份有限公司

Wisdom business area information interaction system

The invention discloses a wisdom business area information interaction system comprising an electronic tag, a mobile terminal, an external network server and a database. The electronic tag includes an NFC data access module; the mobile terminal includes an NFC data receiving module, an NFC data processing module connected with the NFC data receiving module, and an NFC data transmitting module connected with the NFC data processing module; the external network server carries out data communication with the mobile terminal; and the database is connected with the external network server. The wisdom business area information interaction system of the invention enables information interaction between consumers and merchants to be easily realized, and has the advantages of large amount of readable data information, good safety, easy reading and identification, simple structure, and low production and application costs.
Owner:SHANGHAI SHIHENG INFORMATION SCI & TECHCO LTD

Plant retained element experimental apparatus for water quality and water yield three-dimensional simulation control

The invention discloses a plant retained element experimental apparatus for water quality and water yield three-dimensional simulation control, comprising a rainwater storage tank, a water pump, a water duct, a bracket, a shower nozzle, a porous water distribution plate, a raining hole, micropore clay pipes, an elbow, water content monitoring probes, an experimental soil bin, a water outlet pipe, a sampling bottle, a desk, a plug, a runoff pipe, a suction pipe, a runoff storage groove, a water content monitor, an automatic display screen, a regulating valve and a water content induction line. A lower outlet of the rainwater storage tank is connected with a water inlet of the water pump; the water outlet of the water pump is used for conveying artificial rainwater to the shower nozzle through the water duct, wherein the shower nozzle is connected with the other end of the water pump; the artificial rainwater is uniformly sprayed in the experimental soil bin via the porous water distribution plate; the micropore clay pipe is located at the middle part of the experimental soil bin and connected with the sampling bottle via the suction pipe, and the water outlet pipe is located at the bottom of the experimental soil bin; and the regulating valve arranged on the water content monitor can selectively connect to different water content monitoring probes and simultaneously display data of the water content of the point on the automatic display screen. The experimental apparatus is simple in structure, economic and practical.
Owner:BEIJING NORMAL UNIVERSITY

A measurement system and method for measuring dispersion characteristics of smoke powder spraying

ActiveCN110679992BGain a comprehensive understanding of dispersion characteristicsEasy to shootTobacco treatmentThermodynamicsSoil science
The invention relates to a measurement system and a measurement method for the dispersion characteristics of smoke powder spraying, including a smoke powder spray system, a detection system and a smoke powder recovery system. This technical solution is a detection system that can investigate the dispersion characteristics of the tobacco powder spraying process, which is proposed in response to the process requirements of the existing papermaking method in the reconstituted tobacco leaf industry. air system. The detection system includes a plexiglass dispersion chamber, a micro detection platform, a macro detection platform and a data acquisition system; the macro detection platform can obtain the dispersion information of the entire flow field profile, including the dispersion angle and penetration distance, and the micro detection platform can obtain the time of the local flow field. Average distribution of mean flow field velocity, time-averaged particle distribution plot of average concentration distribution.
Owner:HENAN CIGARETTE IND TOBACCO SLICE

An optical tag anti-counterfeiting method based on pseudo-random number stream cipher

The invention provides an optical anti-fake method based on the pseudo-random number flow cipher. The personal portable smart device and the legitimate optical label device are provided with the same configuration of the pseudo random number flow cipher generator. The legitimate optical label data flow is encrypted by inputting the cipher key of the pseudo-random number flow into the generator of the pseudo-random number flow password and outputting the encrypted password flow. The optical label data information is encrypted by the pseudo-random number flow cipher, which the encryption method can be widely promoted and used with the open system and the convenient operation.
Owner:SHAANXI WHYHOW INFORMATION TECH CO LTD

Novel intelligent urinary surgery digital image device

The invention discloses a novel intelligent urinary surgery digital image device which comprises a vertical walking frame. The vertical walking frame is installed on a column above a base and rotatably connected with a horizontal plate through a turntable, the vertical walking frame is connected with an amorphous silicon flat panel detector through a connecting plate, the amorphous silicon flat panel detector is arranged below an examining table with four top corners provided with table legs, the output end of an image processing module is electrically connected with the input end of a processor, the output end of the processor is electrically connected with the input ends of an X-ray transmitting device, an output interface and a walking mechanism, and the output end of the output interface is electrically connected with input ends of a picture archiving and communication system (PACS) module and the input end of an output device. An intelligent module is adopted, a digital imaging and communications in medicine (DICOM) interface is configured, image digitization is achieved, a PACS can be connected, medical workers' labor intensity and waiting time are greatly reduced, and hospitals' working efficiency is improved.
Owner:侯俊清

A mud pulse data encoding method and transmission method

The invention provides a mud pulse data encoding method and transmission method. The encoding method includes: determining the number of pressure pulse combinations and the number of binary digits according to the range of the data to be transmitted and the required accuracy; converting the binary system to the binary system, dividing the converted binary system into time segments according to the digits, and each minute The segment includes different numbers of time slots; use pressure pulse combinations of different amplitudes to represent the value of each digit, and encode the amplitude, number of pulse pressures, and positions corresponding to the pulses, and use different amplitudes to Numerical values ​​and time slot positions establish a coding protocol to complete mud pulse data coding. The transmission method encodes the data according to the encoding method before transmitting. The invention can prolong the service life of the valve, can transmit more data in the same time period, and can effectively improve the transmission rate.
Owner:CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1

A Reversible Beam Divergence Angle Movement Measuring Mechanism

The invention discloses a reversible beam divergence angle mobile measurement mechanism. Through a reversible mechanism, a beam divergence angle measurement device can be moved out of a beam area after measurement or during the measuring process. The defect that beam divergence angle measurement is difficult and sensors and cables are easily short-circuited and damaged during long-term ignition of an ion thruster is solved. A rack is a double-layer structure: a rotating device is installed at the upper layer and the lower layer is a cavity with an opening. A crank is an inverted U-shaped structure. One arm of the crank is fixed on the rotating device, and the other arm of the crank is fixed on the beam divergence angle measurement device. In a test state, a test surface of the beam divergence angle measurement device is positioned in a test area and in a vertical state. When the beam divergence angle measurement device withdraws from the test, the rotating device rotates under the control of a stepper motor, and the crank drives the beam divergence angle measurement device to overturn downwards. The crank is contained into the second-layer cavity of the rack. The test surface of the beam divergence angle measurement device departs from the test area and is in a horizontal state.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH

A metabolomics data fusion optimization processing method

The invention discloses a metabonomics data fusion optimization processing method. The method comprises the following steps of 1, converting metabonomics data of many patients of different sources into metabonomics data matrixes separately, 2, using an experiment design method to optimize a metabonomics data optimal preprocessing method with different sources separately, then through the optimized data optimal preprocessing method to process the metabonomics data matrixes in the step 1, and through the combination of a classification model, finding metabolite data with great contribution; 3, converting the metabolite data with the great contribution found in the step 2 into an important metabolic data matrix; 4, using the experiment design method to optimize the data optimal preprocessing method of the important metabolic data matrix, through the optimized data optimal preprocessing method, processing the important metabolic data matrix obtained in the step 3, and through the combination of the classification model, typing and classifying different patients. According to the metabonomics data fusion optimization processing method, the accuracy for typing and classifying diseases is improved, and a doctor can be assisted in more precisely laying out a personalized treatment scheme for a patient.
Owner:WENZHOU MEDICAL UNIV

Laser thickness measurement method and device

The invention discloses a laser thickness-measuring method and device. The method comprises the following steps of (1) collecting image data of a laser spot returned by a datum plane; (2) conducting preprocessing on the image data of the laser spot, then conducting coarse positioning, and obtaining a spot center pixel point xi after coarse positioning; (3) using the xi to serve as a center to confirm a mono-peak area, conducting fine positioning on a plurality of data points in the mono-peak area, and obtaining a spot center which is marked as x1 after the fine positioning; (4) again collecting the image data of the laser spot returned by an object to be measured, repeating the step (2) and the step (3) to obtain a spot center, which is marked as x2, of the object to be measured after fine positioning, and enabling displacement z of the spot centers of the object to be measured and the datum plane to be | x1-x2 |; and (5) calculating the thickness y of the object to be measured according to the displacement z. The method conducts processing based on a CCD algorithm and an embedded type ARM algorithm, and is high in speed, high in precision and capable of achieving on-line measuring.
Owner:ZHEJIANG SCI-TECH UNIV

Internet of things system, agent device and method for Internet of things

The purpose of the present invention is to provide an Internet of Things system, an Internet of Things agent device and an Internet of Things agent method for optimizing Internet of Things services, which can effectively reduce the impact of communication network delays and communication network failures on Internet of Things services, and at the same time reduce the impact of Internet of Things services. Networking services put pressure on communication networks and improve the security of network data. The Internet of Things agent device of the present invention includes: a local processing control unit, which judges whether the data information needs to be processed locally according to the data information received from the Internet of Things terminal device; During local processing, corresponding local processing is performed on the data information; and the control information processing unit generates control information according to the result of local processing by the data information processing unit and sends it to the IoT terminal device; when the local processing control unit judges that it does not need For local processing, the data information is forwarded to the server.
Owner:HITACHI LTD

Sinusoidal force system friction testing method

InactiveCN111780906AGood closed-loop performanceThere is no problem of missing special dataApparatus for force/torque/work measurementDriving currentLow speed
The invention discloses a sinusoidal force system friction testing method. A signal generator is connected with a tested object through an amplifier; a speed sensor is installed on the tested object and transmits data to a test computer. The signal generator outputs a sinusoidal signal to drive the amplifier to generate a sinusoidal driving current, the thrust borne by the measured object is F = rho Asin (omega t), and rho is a thrust-current coefficient and is a constant; the amplitude and the period of the sinusoidal signal are adjusted to enable the moving speed of the measured object to reach the highest speed Vmax; a group of speed data V (t) composed of a plurality of periods are recorded; synchronization and noise reduction processing is performed on the data to obtain a data curveof a single period, and the acceleration a (t) of the measured object is calculated according to the speed data; the friction force is calculated according to f (t) = F (t)-Ma (t); and a friction curve is drawn according to the speed data V (t) and the friction data f (t). According to the sinusoidal force system friction testing method, the problems in the prior art that constant speed and low speed precision is poor, reversing friction cannot be tested, and discrete data feature points omit modeling errors can be solved.
Owner:BEIJING INFORMATION SCI & TECH UNIV

A method for measuring ion thruster beam current based on Faraday probe array

The invention discloses an ion thruster beam current testing method based on a Faraday probe array, which can simultaneously realize the testing of the ion thruster beam current distribution, beam divergence angle, and thrust vector deflection angle. All probe test signals are collected synchronously, and the amount of data information is large. It usually only takes a few minutes to complete a complete test and data processing. There is a shielding jacket on the outside of the ion current collection plate of each Faraday probe, and the shielding jacket is directly connected to the disc-shaped metal bracket through metal contact to realize electrical connection, then only one wire can be used to supply bias to the disc-shaped metal bracket voltage, greatly reducing the number of probe leads. When calculating the beam divergence angle, the ion beam current density current value whose test current value is less than 5% of the average value is zero, so as to reduce the measurement error. The measuring point is located in the center of the small test area, and the beam current density measured at the measuring point is regarded as the average value of the beam current in the small area, thus simplifying the calculation.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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