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161 results about "Analysis design" patented technology
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Design analysis is the systematic process of developing a design including all information discovery, planning and communications. This can be applied to any type of design including the design of physical things such as buildings and intangible things such as software, information and processes.
Composite internal fixators
ActiveUS20120059376A1Desired performanceInternal osteosythesisJoint implantsModel selectionElement analysis
A multi-layer, fiber-reinforced composite orthopaedic fixation device having a design selected based on a desired characteristic of the orthopaedic fixation device. The design may be selected according to a model of the device, the model defining design constraints, and the design may comprise a pattern of the fiber angle for each layer. The selection of a design may be analyzed using finite element analysis to determine whether the design will comprise the desired characteristic.
Owner:SMITH & NEPHEW INC
Method of adaptive interactive learning control and a lithographic manufacturing process and apparatus employing such a method
InactiveUS20050043834A1Less potentImprove tracking performanceSemiconductor/solid-state device testing/measurementElement comparisonManufacturing technologyAdaptive filter
By applying time-frequency analysis to a given standard iterative learning control or ILC an adaptive filter for the learned feed-forward loop is designed. This time varying filter varies according to the momentary frequency content of the error signal and allows to discriminate between areas of deterministic and stochastic error. Its application results in selective application of ILC to those intervals where error signals of high level are concentrated and allows application of a single ILC acquisition to different setpoint trajectories. The adaptive filter finds particular use in lithographic scanning systems where it is used for varying scan length.
Owner:ASML NETHERLANDS BV
Individuation minimal invasive vertebral pedicle screw entering navigation template and preparation method thereof
The invention relates to an individuation minimal invasive vertebral pedicle screw entering navigation template and a preparation method of the navigation template. The preparation method of the navigation template includes: reconstituting a three-dimensional model of a target vertebra based on a medical image; conducting the screw entering porous channel virtual analysis design on the three-dimensional model and defining a screw entering porous channel; taking feature points from the three-dimensional model, designing a vertebral pedicle screw entering navigation template prototype and obtaining a navigation template which fully fits for the vertebral body through the Boolean calculation; and manufacturing the navigation template through 3D printing and other processing methods. The individuation minimal invasive vertebral pedicle screw entering navigation template closely fits for the mastoid process and the lamina arcus vertebrae, is high in stability, ensures accurate implanting of the vertebral pedicle screw, avoids direct contact with the spinous process, reduces peeling of the muscle ligament, realizes minimal invasion, is applicable to various situations such as the vertebral distortion and slipping and the rupture of the vertebral pedicle, prevents slipping and distortion during screw entering due to the arrangement of a finger pressing board, and is convenient to operate and low in the requirement for doctors, degreases the operation risk, improves the operation efficiency and reduces the operation cost further.
Owner:苏州昕健医疗技术有限公司
Multi-source data integration method based on geographic information
InactiveCN106610957AEfficient integrationAchieve mutual integrationDatabase management systemsGeographical information databasesSystem configurationData profiling
The invention discloses a multi-source data integration method based on geographic information, and belongs to the geographic information technology. The method is characterized in comprising the following steps of: 1) analysis design: investigating and surveying required data, and generating a data analysis report; 2) data arrangement processing: carrying out integration processing on the data subjected to the analysis design; 3) data storage: carrying out classification integration storage on an achievement obtained after data processing, and forming a kernel database; and 4) map service configuration: carrying out symbol rendering on spatial data, publishing the spatial data to a corresponding map server, and carrying out the integrative display of system configuration and service in an appointed system. The method has the advantages that multi-source data, including the spatial data, business data, attribute data, workflow data, element data and the like, can be effectively fused, and data processing and application methods can be effectively combined and applied.
Owner:星际空间(天津)科技发展有限公司
Method and system for improving yield of an integrated circuit
ActiveUS20070198956A1Increase productionDetecting faulty computer hardwareCAD circuit designEngineeringOptimal design
Method and system for improving yield of an integrated circuit are disclosed. The method includes optimizing a design of the integrated circuit according to a set of predefined design parameters to generating design points that meet a set of predefined design specifications, analyzing the design points to form clusters comprising the design points, determining a representative design point from the clusters comprising the design points, running a statistical simulation to determine a yield of the design using the representative design point and a statistical model of manufacturing process variations, generating statistical corners in accordance with results of the statistical simulation, and optimizing the design in accordance with the statistical corners using an iterative process.
Owner:CADENCE DESIGN SYST INC
Building industrialization concrete horizontal structure prefabricated part application primary design method
The invention discloses a building industrialization concrete horizontal structure prefabricated part application primary design method. A general 'standard superposed beam selection parameter and corresponding number table', various forms of 'bending, shearing and twisting reinforcing bar number combination tables' of superposed floor beams of different concrete grades and section sizes, a 'horizontal prefabricated concrete superposed floor beam standard schematic handbook', a general 'standard superimposed floor slab selection parameter and corresponding number table', a 'horizontal prefabricated superposed floor beam standard graph parameter database', a 'horizontal prefabricated superimposed floor slab standard graph parameter database' and the like are compiled, and are matched with parameters, a software module and a computing result of horizontal structure prefabricated part application primary design software adapted from building structure analysis design software. Through adoption of the method, the design, prefabrication and installation application costs of a novel building industrialization structural part can be lowered, and the bottleneck of the existing industrial assembly type concrete building structure application development can be broken.
Owner:浙江省建筑科学设计研究院有限公司
Road obstacle recognition device and recognition method thereof
InactiveCN103625367AReal-time analysis of road conditionsEnsure driving safetyOptical viewingRoad surfaceTime pattern
The invention discloses a road obstacle recognition device and a recognition method thereof used for automobile auxiliary safety or automatic driving. The road obstacle recognition device comprises a laser emission device, which is arranged on a headstock and is used for projecting a design pattern to the road surface in front of the automobile; an image capture device, which is arranged on the headstock and is used for capturing a laser real-time pattern on the road surface in front of the automobile; a processor, which is used for receiving data transmitted by the image capture device, analyzing the design pattern and the real-time pattern, and transmitting an analysis result to an automobile automatic driving system. The recognition method comprises the following steps of projecting the design pattern to the road surface in front of the automobile; capturing the laser real-time pattern on the road surface in front of the automobile; analyzing the design pattern and the real-time pattern, and transmitting the analysis result to the automobile automatic driving system. The road obstacle recognition device and the recognition method thereof have the beneficial effects that the road condition in front of the automobile can be analyzed in a real-time manner, an obstacle which is likely to cause driving safety hazard is obtained, and driving safety is ensured.
Owner:魏子安
High-resolution SAR image ship detection method based on visual attention mechanism
ActiveCN107274401AImprove real-time performanceImprove accuracyImage enhancementImage analysisPattern recognitionFrequency spectrum
The invention discloses a high-resolution SAR image ship detection method based on a visual attention mechanism, and belongs to the field of radar image target detection. Mainly aiming at a problem that a conventional high-resolution SAR image target detection method cannot meet the demands of intelligent detection and the real-time requirements, the method comprises the steps: extracting a visual significant model of a frequency spectrum residual error part comprising target information in an image based on the frequency domain Fourier transform; carrying out the binarization processing of a saliency map and the extraction of an AOI (area of interest), analyzing and designing a local maximum posterior probability classifier to carry out the target detection of a target region from the angle of classification, and achieving the detection through a parameter estimation and decision criterion. The method can improve the ship detection real-time performance and accuracy through the high-resolution SAR image, and effectively solves a problem of higher false alarm in detection.
Owner:NAVAL AVIATION UNIV
Method and apparatus for injecting fault and analyzing fault tolerance
ActiveUS20160334467A1Digital circuit testingError detection/correctionFault toleranceDesign information
Disclosed herein is a method and apparatus for injecting a fault and analyzing fault tolerance. The fault tolerance analysis apparatus extracts design information from a design. The fault tolerance analysis apparatus may inject a fault into a simulation of the design based on the extracted design information and parameters, and analyzes an influence of the fault on the simulation. Accordingly, in accordance with the fault tolerance analysis apparatus, fault tolerance for the fault injected into the simulation is analyzed, and the effect of the fault tolerance mechanism provided in the design is analyzed.
Owner:ELECTRONICS & TELECOMM RES INST
Method and system for improving yield of an integrated circuit
Owner:CADENCE DESIGN SYST INC
Method and apparatus for analyzing a design
InactiveUS6931366B2Overcomes drawbackImprove reliabilityDigital computer detailsNuclear monitoringEngineeringAnalysis design
A system 10, which receives a computer, aided model or design 18 and which probabilistically analyzes the model 18 by use of a modified Latin Hypercube sampling technique and combined MARS and Kriging simulation methodologies, thereby allowing a simulation to be conducted at a most probable point of operation and allowing products having desired characteristics and attributes to be created.
Owner:FORD MOTOR CO
Composite internal fixators
ActiveUS9492210B2Internal osteosythesisDiagnostic markersOrthopedic fixation devicesElement analysis
Owner:SMITH & NEPHEW INC
Construction method of ISP and CP combined content distribution mechanism based on edge cache
InactiveCN107483630AReduce redundant transmissionImprove experienceSelective content distributionData switching networksContent distributionEdge based
The invention discloses a construction method of an ISP and CP combined content distribution mechanism based on edge cache. The method comprises the following steps: acquiring network content request data, and extracting content related information; analyzing a network content popularity feature, and designing a content popularity model; deploying the content at a network edge according to the content popularity model; counting the load of a CP content source server, and computing CP service cost; analyzing the load of an ISP network node and the traffic transmitted by a link, and computing ISP network service cost; computing the cost caused by cache importing according to the deployed cache capacity; constructing a yield model of the ISP and CP combined service based on the edge cache; and analyzing the relation among various factors in the designed model, and verifying the effectiveness of the designed model in a simulation way.
Owner:BEIJING UNIV OF TECH
High-efficiency wide-load-range three-phase micro-inverter and control method thereof
ActiveCN105162350AEnsure controllabilitySimple topologyAc-dc conversionDc-dc conversionDc currentAnalysis design
The invention discloses a high-efficiency wide-load-range three-phase micro-inverter and a control method thereof. The high-efficiency wide-load-range three-phase micro-inverter includes a front stage DC-DC converting module used for transmitting electric energy output by a photovoltaic assembly and tracking the maximum power point of the photovoltaic assembly; a middle-stage quasi-third harmonic injection circuit used for injecting AC current meeting power grid connection condition obtained through combination of inverted six-pulse DC current output by the front-stage circuit and quasi-triangular wave output by said circuit; a rear-stage bridge-type inverting circuit, filtering circuit and power grid used for performing inversion on current output by a power optimizing module, filtering the current obtained through combination of the inverted current and the quasi-triangular wave output by the quasi-third harmonic circuit through the filtering circuit and injecting the current into the power grid. The invention also discloses methods for analyzing and designing the quasi-third harmonic injection circuit and extracting ad controlling quasi-third harmonic wave injection current reference signals. The three-phase micro-inverter has characteristics of being simple in structure, high in converting efficiency and small in size.
Owner:CHANGSHA VICTORY ELECTRICITY TECH
.NET based three-layer scientific research management information system for higher vocational schools
InactiveCN102136108AFlexible assessmentObjective assessmentData processing applicationsSpecial data processing applicationsSystems designSystem maintenance
The invention relates to a.NET based three-layer scientific research management information system for higher vocational schools, and finally realizes a B / S mode-based scientific research management information system from aspects of requirement analysis, system design, software implementation and the like according to the thought of software engineering. The system realizes the functions of system data setting, scientific research achievement management, scientific research subject management, searching and browsing statistics and system maintenance management a B / S mode by adopting an active server page (ASP).NET+ structured query language (SQL) Server 2005 technology and using C#. Design of a database refers to related industry standard so that the designed database is more standard and universal. System users are divided into teachers, college and department scientific research secretaries and administrators of scientific research divisions, and the authorities of the system users are divided during design analysis. Automatic inquiry prompt function is realized by applying an asynchronous javascript and XML (AJAX) technology to facilitate user input. The working efficiency of development is improved and the development is reduced by using a master page and a website navigation technology. The system can basically meet the some scientific research management requirements of higher vocational schools and facilitates the working efficiency of the higher vocational schools.
Owner:杨建强
Two-dimensional unsteady-flow numerical model based power engineering location method
ActiveCN103886135AEnsure flood safetyReduce consumptionClimate change adaptationSpecial data processing applicationsDesign floodPower grid
The invention discloses a two-dimensional unsteady-flow numerical model based power engineering location method. On the basis of a plurality of site locations primarily selected according to design requirements of a power grid transmission line, the two-dimensional unsteady-flow numerical model is subjected to verification, parameter modification and design flood simulation by determining a simulation area, digitizing the simulation area and establishing the two-dimensional unsteady-flow numerical model and historical flood data, the site locations primarily selected are sorted according to largest submerged depth, and a primary selection sequence of the site locations is obtained. By the two-dimensional unsteady-flow numerical module flood routing technology, hydrologic characteristics in a certain area and flood hydraulic elements during simulation of flood routing can be truly and objectively reflected, flood control safety of electric power engineering can be guaranteed, construction accuracy can be improved, land source consumption can be reduced, and construction cost can be lowered.
Owner:STATE GRID CORP OF CHINA +3
Method for setting and order reducing of parameters of active disturbance rejection controller based on PID controller
InactiveCN109459934AEasy to controlImprove robustnessControllers with particular characteristicsAdaptive controlFeedback controllerCompound structure
The invention provides a method for setting and order reducing of parameters of an active disturbance rejection controller based on a PID controller. In the method, a two-order RADRC control structureis adopted, the ideal parameters of the PID controller are approached through an RADRC feedback controller transmission function, it is ensured that the controller and the function have similar disturbance rejection and robustness according to the same zero point of the controller and the function, and therefore the two-order RADRC parameters set in the bandwidth form are obtained. Analyzing anddesigning are conducted in a frequency domain according to the equivalent compound structure of the two-order RADRC, and therefore project planners can better accept; the method for setting the parameters of the two-order RADRC on the basis of the bandwidth is simple and visual. The RADRC controller set through the method can have good controllability and is high in robustness and good in disturbance rejection, an adjustment can be conveniently made according to the requirements for object actual running state and controllability, and a model is high in adaptability and operability.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Variable ground pressure tunnel excavating load experiment platform
ActiveCN106323750AMaterial strength using tensile/compressive forcesStructural/machines measurementHydraulic cylinderQualitative analysis
A variable ground pressure tunnel excavating load experiment platform comprises a bottom plate, a simulated rock assembly is arranged on the bottom plate, and the bottom of the simulated rock assembly is supported through a supporting mechanism; one side of the simulated rock assembly is provided with a hydraulic cylinder propulsion mechanism for loading the simulated rock assembly, and the other side of the simulated rock assembly is provided with an excavation cutting propulsion mechanism for cutting the simulated rock assembly, so that the similarity experiments of the operating load conditions of a heading machine in the variable ground pressure surrounding rock excavation process are conducted, the research on the load dynamic characteristics of an excavation cutting device in the excavation process is carried out, the force transmission characteristics qualitative analysis of the excavation cutting propulsion mechanism in the loading excavation process is achieved so as to verify the dynamics analysis design scheme of the heading machine under the load-change working condition.
Owner:LIAONING TECHNICAL UNIVERSITY
Facilitating structural coverage of a design during design verification
ActiveUS20070180414A1Convenient verificationCAD circuit designSoftware simulation/interpretation/emulationControl flowFormal methods
One embodiment of the present invention provides a method and a system that facilitates structural coverage of a design during a design verification process. During operation, the system receives a hardware description of the design, which contains one or more module instances and a set of structural coverage targets for a set of structures in the design. The system then extracts a control flow, the set of structural coverage targets, and a set of structural coverage metrics for the hardware description, and creates a shadow module with the same control flow as the hardware description. This shadow module contains a set of parallel structures that correspond to the set of structural coverage targets in the control flow of the hardware description and serve as targets for formal methods used to analyze the design. The system also generates a set of cross-module references to link the set of parallel structures in the shadow module with signals from the set of structures in the hardware description. The system then applies a formal verification tool to the design, including the shadow module and the cross-module references in an attempt to achieve the desired structural coverage.
Owner:SYNOPSYS INC
Method and mechanism for extraction and recognition of polygons in an IC design
Disclosed is an improved approach for organizing, analyzing, and operating upon polygon data which significantly reduces the amount of data required for processing while keeping elements non-interfacing with each other. According to one approach, clusters of elements are extracted which are then handled separately. In some approaches, a set of polygons forms a cluster if for any two polygons from the set of polygons there exists a sequence of polygons from the set such that the distance between any sequential polygons are less than or equal to a given threshold number. Rather than analyzing each and every polygon in the design, repetitive unique patterns are analyzed once, which are then replicated for all clusters which have the same repetitive pattern.
Owner:CADENCE DESIGN SYST INC
Recipe generation apparatus, inspection support apparatus, inspection system, and recording media
InactiveUS20140177940A1Increase speedShort timeImage enhancementImage analysisAlgorithmAnalysis design
A desired area is extracted by directly analyzing information recorded in a design layout, an inspection recipe is generated by using this extraction method, and an efficient inspection is realized. The invention makes it easy to extract an area of a desired circuit module such as a memory mat by analyzing hierarchy information of design layout data, calculating reference frequency of each one cell in the design layout data that is its internal data, sorting the cells in order of increasing reference frequency, searching the object, and tracing its upper cell.
Owner:HITACHI HIGH-TECH CORP
Visual software modeling method for constructing software view on basis of software meta view
ActiveCN105320504AComputableClear structureGeometric CADVisual/graphical programmingGranularityUsability
Owner:CHENGDU PUZHONG SOFTWARE CO LTD
Airborne system digital design verification system and method
The invention discloses an airborne system digital design verification system and method and belongs to the technical field of system engineering. The system disclosed by the invention comprises a top-layer digital design system and a domain engineering layered digital design system, wherein the top-layer digital design system comprises a demand analysis module, a top-layer analysis design module and a top-layer model test and verification module; and the domain engineering layered design system comprises a single-domain analysis design module, a single-domain test and verification module, multi-domain collaborative design module and a multi-domain model simulation verification module. The method disclosed by the invention comprises the following two steps: concept model machine design of an airborne system and virtual model machine design of the airborne system, wherein the former step comprises the following three sub-steps: demand analysis of the airborne system, system analysis of the airborne system and system design of the airborne system. The system and method disclosed by the invention can be used for supporting the digital analysis, design and verification of the airborne system, realizing 'design and verification first, implementation later' of the airborne system, avoiding the problems of long period, high cost, great risk and the like caused by the 'design and implementation first, verification later' of the traditional design method.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Dual-active-bridge resonant convert modeling, ord reduction, design method, device and system
ActiveCN109271698AThe principle is simpleOverall claritySpecial data processing applicationsSmall-signal modelControl system
The invention discloses a dual-active-bridge resonant convert modeling, ord reduction, design method, device and system. Under the condition of controlling the output voltage of resonant double activebridge converter by single phase-shifting control method, by using the transmission power formula of resonant double active bridge converter, the order of resonant elements in resonant double activebridge converter is reduced, and the average value equivalent model is established. Based on the average mode equivalence, the small signal model of the resonant double active bridge converter is established by using small signal method, and the transfer function is obtained according to the control quantity and the control object. the zero-pole distribution of the transfer function is analyzed and the order of the transfer function is reduced; Aiming at the reduced-order transfer function, the controller parameter design method is used to design the typical type II system. The invention has the advantages of simple principle and clear organization, provides the theoretical basis for the analysis of the resonant double active bridge converter, reduces the difficulty of analysis and design,and is easy to adopt the traditional control system parameter design scheme to design the controller.
Owner:NARI TECH CO LTD +5
Strict regression orbit design method considering high-order gravity field
ActiveCN110378012AMeet application needsImprove regression accuracyDesign optimisation/simulationSpecial data processing applicationsMulti objective optimization algorithmRadar
The invention provides a strict regression orbit design method and system considering a high-order gravity field and a medium. The method comprises the following steps: a satellite orbit initial design step: performing regression orbit parameter analysis design considering J2 perturbation influence according to satellite orbit design overall input including a regression day number and a regressioncircle number to obtain an analysis design result, and performing differential correction on the analysis design result through a Newton iteration method to obtain J2 perturbation satellite orbit initial design initial values; a strict regression orbit design step: combining a Newton iteration method with a multi-objective optimization algorithm NSGA-II according to obtained strict regression orbit optimization design initial value..Through a regression orbit hybrid optimization design algorithm under a high-precision gravity field, rapid optimization design of a strict regression orbit is realized. Compared with an existing method, a more accurate dynamic environment is considered, the regression precision can be greatly improved, and the application requirement of a synthetic aperture radar interferometry system is met.
Owner:SHANGHAI JIAO TONG UNIV
Nuclear power plant system regular test project analysis design method
ActiveCN105097059AGuaranteed feasibilityGuaranteed validityPower plant safety arrangementNuclear energy generationProject analysisGuideline
The invention relates to a nuclear power plant system regular test project analysis design method. The method comprises the following steps: (I), screening systems needing regular tests in a nuclear power plant system; (II), for the systems needing the regular tests, determining projects and content of the needed regularly conducted tests, and determining acceptance criteria which devices or parts which are determined by the projects for executing different functions should satisfy when the regular tests are executed; and (III), determining test periods of the devices or parts of the projects in executing the regular tests, and at the same time, establishing regular test notes according to needs of the test projects. According to the invention, based on functions and configuration executed by systems, the systems needing the regular tests are screened, and according to the function execution reliability, the projects and the content executing the regular tests are analyzed and designed, such that it can be ensured that the safety, and safety-correlated systems, devices and functions can be regularly examined, accordingly, it is ensured that the functions are at normal states, and at the same time, the feasibility and the validity of executing the regular tests by operation personnel can also be guaranteed.
Owner:CHINA NUCLEAR POWER ENG CO LTD
Method for generating PLC (programmable logic controller) code for interlocking system
InactiveCN102541562AReduce the ability to verifyGuaranteed correctnessSpecific program execution arrangementsElement modelProgrammable logic controller
The invention provides a method for generating a PLC (programmable logic controller) code for an interlocking system, comprising the following steps of: A, setting a rule for transferring an interlocking table element model into an expanded interlocking table element model according to the actual operation requirements of the railway, wherein the rule conforms to the grammar of the model-model transfer language QVT; B, setting a rule for transferring the expanded interlocking table element model and an interlocking access logic element module into a PLC element model according to the transfer requirement of a PLC model, wherein the rule conforms to the QVT crammer; and C, setting a rule for transferring the PLC element model into a PLC code according to the transfer requirement of the PLC code, wherein the rule is based on the grammar of the model-text transfer language MOFScript. Due to the adoption of the method for generating the PLC (programmable logic controller) code for the interlocking system, the development efficiency of the software of the interlocking system can be improved, the reliability and the security of the software of the interlocking system can be enhanced, the problem of low efficiency caused by manual coding can be avoided, the human errors resulted from manual coding can be effectively alleviated, the synchronization of the document and the final code generated in the analysis and design phase can be guaranteed, and the follow-up software upgrading and maintaining efficiency and accuracy can be enhanced.
Owner:BEIJING JIAOTONG UNIV
Availability evaluation method of smartphone human-computer interface on the basis of user model
ActiveCN105701015AImprove reliabilityImprove universalitySoftware testing/debuggingUsability assessmentHuman–machine interface
The invention discloses an availability evaluation method of a smartphone human-computer interface on the basis of a user model. The availability evaluation method comprises the following steps: according to the user model, establishing a classification standard of an availability problem; in a task testing process, collecting the eye movement data and the user operation behavior data of a user; and establishing a mapping relationship between test data and the availability problem for analyzing problems existing in design, and giving an improvement suggestion. Through the user model, the availability evaluation method puts forwards an availability problem classification standard suitable for the availability evaluation of the smartphone human-computer interface so as to be favorable for helping design personnel to find the position and the reason of errors of the availability problem, and an effective suggestion on the design can be put forward. The mapping relationship between objective data and the availability problem is established to help availability evaluation personnel to classify the found availability problems. Compared with the subjective evaluation of an availability evaluation expert, the method is high in reliability on the classification of the availability problems.
Owner:XI AN JIAOTONG UNIV
Manufacturing technology for hybrid exciting permanent magnet wind generator
ActiveCN105529876APrecise positioningGuaranteed uniformityManufacturing stator/rotor bodiesGeneral assemblyManufacturing technology
The invention discloses a manufacturing technology for a hybrid exciting permanent magnet wind generator. The manufacturing technology comprises a complete motor assembly technology, a rotor assembly technology and a stator assembly technology, wherein the rotor assembly technology comprises rotor sheet fabrication, rotor core overlying and rotor core press fitting; a vertical assembly method is adopted by the complete motor assembly technology; stators and rotors are vertically downward in the overall assembly process in assembly between the stators and the rotors; and the complete motor assembly process is analyzed by ANSYS finite element analysis software. Analysis design is carried out on an assembly device of the hybrid exciting permanent magnet wind generator; a five-sided positioning rotor core overlying method is provided and is successfully applied to assembly of a 100kW hybrid exciting motor rotor core; a vertical stator insertion assembly method is provided; the attractive force of a permanent magnet is overcome by gravity of the stators and the rotors; contact between the stators and the rotors in the assembly process is effectively limited; and general assembly is safely and smoothly finished.
Owner:SHENYANG POLYTECHNIC UNIV
Method for establishing space correlation model of technical error in integrated circuit chip
ActiveCN101996266APracticalHigh precisionSpecial data processing applicationsObservational errorProcess deviations
The invention belongs to the field of integrated circuits, relating to a method for establishing a space correlation model of technical errors in an integrated circuit chip. The method comprises the following steps of: extracting an unknown parameter of a space correlation function by utilizing the maximum likelihood estimation of a multi-test chip, and establishing the space correlation model ofthe errors in the chip; and multiplying a likelihood function of all test chips to obtain a joint likelihood function, solving through maximizing the joint likelihood function to obtain the space correlation function which is determined by a parameter value and can be directly used for circuit analysis design of the technical errors. The influence of pure random part of the error in the chip and the measurement error can be processed in the extraction process of the space correlation function, and the precision of an extracted result is remarkably improved. Determinant logarithms of symmetrical positive definite matrixes in the joint likelihood function are calculated by utilizing an LU (Logic Unit), and the problem of unstable number value occurring in direct calculation is solved.
Owner:FUDAN UNIV
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