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156 results about "Iterative analysis" patented technology

Not Found. Iterative refers to a systematic, repetitive, and recursive process in qualitative data analysis. An iterative approach involves a sequence of tasks carried out in exactly the same manner each time and executed multiple times.

Large structure dynamic optimization design method based on structural decomposition

The invention relates to a large structure dynamic optimization design method based on structural decomposition. In three-dimensional modeling software, a geometric model of a large member is established, a size variable of an external frame forming a structural member is recognized, and a basic style and the size variable of an internal composition unit are recognized; the external frame of the structural member is subjected to topological optimization, the size of the internal composition unit is optimized, and size data are acquired; the optimized size data are imported into Isight-FD software, optimization iterative analysis is performed on different combinations and different size configurations of the external frame and the internal composition unit according to the constraint condition and the target function, and an optimization result is output. The method is widely applied to lightweight and weight reduction design of a large and heavy-load complicated structure part and has the advantages of capability of realizing design from the simple into the deep as well as fastness and reliability. Due to the robustness of an algorithm, the geometric structure meeting the requirements of mechanical properties can be found only through a few sampling points, and reliable technical support is provided for structure design work of large heavy-load equipment at the present stage.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI

Planar simulation and verification platform for four-degree-of-freedom robot arm control system

The invention discloses a planar simulation and verification platform for a four-degree-of-freedom robot arm control system, comprising four simulated robot arm joints, one set of six-dimensional force sensors, two arm rods, one end executor with binocular visual camera, one set of remote measurement camera and remote measurement camera controller, one set of middle distance measurement camera and middle distance measurement camera controller, a UMAC (Universal Motion and Automation Controller) motion control card, an industrial personal computer, a gas floating platform and a simulated fixing wall. Under the planar motion state, the planar simulation and verification platform for the four-degree-of-freedom robot arm control system can realize the verification of a simulation test on a high-precision and high-stability servo control algorithm for a great-load and multiple-degree-of-freedom system of a large spatial robot arm, the verification of a control test on the grasping, collision dynamics and control of the end executor, and the verification of a simulation test on the coupling characteristics between the dynamics of the spatial robot arm and the control system; moreover, the planar simulation and verification platform undergoes iterative analysis with a simulated model; and therefore, a verification method is provided for the breakthroughs of a spatial large robot arm control system algorithm and a key technique.
Owner:BEIJING INST OF SPACECRAFT SYST ENG

Finite element model correction method based on positive substructure

InactiveCN104484502ALighten the computational burdenReduce analytical computing equipment requirementsSpecial data processing applicationsElement modelCorrection method
The invention discloses a finite element model correction method based on a positive substructure. The finite element model correction method includes the steps: firstly, dividing an integral structure finite element model into independent substructure models; building an integral structure characteristic equation according to the substructure models to obtain an integral structure characteristic solution; building an integral structure characteristic sensitivity equation according to the integral structure characteristic equation to obtain an integral structure characteristic solution sensitivity matrix; building a target function according to residual errors of the integral structure characteristic solution and a measured integral structure test mode; adjusting structural parameters of the substructure and minimizing the target function to obtain optimal structural parameters; adjusting structural parameters of the finite element model and correcting the finite element model; recognizing structural damage according to change of result parameters of the finite element model. When a structure is locally damaged and a local area needs to be corrected, large structure finite element model correction efficiency and precision are effectively improved only by iteratively analyzing the local substructure models without repeatedly analyzing the integral structure model.
Owner:HUAZHONG UNIV OF SCI & TECH

Learning-based video coding and decoding framework

ActiveCN108174218AEncoding rate-distortion optimization controlDigital video signal modificationTime domainCoding block
The invention discloses a learning-based video coding and decoding framework, which comprises a space-time domain reconstruction memory, a space-time domain prediction network, an iterative analyzer,an iterative synthesizer, a binarization device, an entropy coder and an entropy decoder, wherein the space-time domain reconstruction memory is used for storing a reconstructed video content after coding and decoding; the space-time domain prediction network is used for utilizing the space-time domain correlation of the reconstructed video content, modeling the reconstructed video content througha convolutional neural network and a circulating neural network, and outputting a predicted value of a current coding block, wherein a residual error is formed by subtraction of the predicted value and an original value; the iterative analyzer and the iterative synthesizer are used for coding and decoding the input residual error step by step; the binarization device is used for quantizing the output of the iterative analyzer into a binary representation; the entropy coder is used for carrying out entropy coding on the quantized coding output in order to obtain an output code stream; and theentropy decoder is used for carrying out entropy decoding on the output code stream and outputting the output code stream to the iterative synthesizer. According to the coding framework, the prediction of a space-time domain is realized through the learning-based VoxelCNN (namely space-time domain prediction network), and the control of video coding rate distortion optimization is realized througha residual iterative coding method.
Owner:UNIV OF SCI & TECH OF CHINA

Agile satellite mission interpretation closed loop simulation verification system and method

The invention provides an agile satellite mission interpretation closed loop simulation verification system and method. Efficiency of key links of simulation verification and inversion modification of current agile satellite mission planning can be effectively enhanced, and correct implementation of agile satellite mission planning can be guaranteed. With application of the agile satellite mission interpretation closed loop simulation verification system and method, firstly a satellite mission host mission interpretation function is simulated, a conventional satellite mission test bed is replaced, mission blocks are interpreted into instruction sets which can be performed by a satellite mission host and information of instruction names, parameters and performing time can be visually displayed in a form mode, and mission block interpretation results are automatically interpreted and abnormal information is outputted so that noting of error mission blocks on satellites can be avoided; secondly, the parameters in the mission blocks and mission block settings can be modified and the mission blocks can be generated again by the system, and iterative analysis is performed on the mission blocks so that correctness can be guaranteed, the risk caused by manual arrangement of the mission blocks can be avoided, and mission block generation efficiency and reliability can be enhanced; and finally the interpretation results of the finally generated correct mission blocks are compared with action sequences generated by a mission planning system so that correctness and rationality of mission planning can be verified.
Owner:AEROSPACE DONGFANGHONG SATELLITE

GNSS satellite selection method based on robust least square

The invention discloses a GNSS (Global Navigation Satellite System) satellite selection method based on robust least square, which comprises the following steps: (1) constructing a pseudo range measurement model; (2) setting the priori value of a weight matrix, and solving the pseudo range measurement model constructed in step (1) by using the least square technology to get the receiver position solution and the clock error; (3) calculating the standard residual according to the receiver position solution and the clock error, and using a robust equivalent weight coefficient to update the weight matrix; and (4) judging and analyzing the weight of each satellite according to the updated weight matrix; if the weight of a satellite is equal to 0, eliminating the satellite from the pseudo rangemeasurement model, extracting the corresponding element of the weight matrix, recalculating the receiver position solution and the clock error by using the least square technology, and transferring the receiver position solution and the clock error to step (3) to make iterative analysis; and if the weights of all satellites are not equal to 0, outputting available satellites, and ending the satellite selection program. Through the method, the weight of each observation satellite can be adaptively adjusted, and satellites with poor observation quality can be eliminated.
Owner:CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST

Electricity fee collection risk assessment device based on big data platform clustering algorithm and method thereof

InactiveCN104992297AAvoid the risk of not paying bills on timeReduce the risk of not being able to return on timeResourcesClustered dataCluster algorithm
The invention relates to the technical field of fee collection risk assessment, and provides an electricity fee collection risk assessment device based on a big data platform clustering algorithm and a method thereof. The device comprises an electricity consuming unit feature data import module, a clustering data mining module and an electricity consuming unit credit evaluation system output module. The electricity consuming unit feature data import module extracts a social attribute indicator, a value attribute indicator, a behavior attribute indicator and other mass data of an electricity consuming unit and stores the mass data in a big data platform. The clustering data mining module performs parallel iterative analysis processing one the data and preliminarily judges the credit rating to which the electricity consuming unit belongs. The electricity consuming unit credit evaluation system output module confirms and outputs the credit rating of the electricity consuming unit according to data division of the clustering data mining module. The risk that the electricity consuming unit does not pay electricity fee on time can be effectively avoided so that the risk that funds of electric power enterprises cannot be withdrawn on time can be effectively reduced further.
Owner:STATE GRID CORP OF CHINA +1
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