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1805results about How to "Shorten the design cycle" patented technology

Laser radar road reconstruction and expansion exploratory survey design method

The invention discloses a laser radar road reconstruction and expansion exploratory survey design method. The method comprises the steps of A designing a result coordinate benchmark, measuring basic control and measuring pavement control points; B determining parameters including the data density, acquisition route and the like, and acquiring vehicle laser radar data along a main road and a ramp; C determining parameters including the data density, flight design and the like, and acquiring airborne laser radar data according to a designed flight strip; D realizing laser radar data fusion by refining laser point cloud plane coordinates and elevation coordinates and refining track line data; E acquiring characteristics of road traffic lane lines by using point cloud intensity information, and realizing extraction of characteristic lines of road pavements, protection and the like by adopting a method of projecting three-dimensional point clouds to a two-dimensional plane; F recovering planar elements and longitudinal surface elements of an existing road; G producing a DEM (digital elevation model), a DOM (digital orthophoto map) and a DLG (digital line graphic); H collaboratively designing laser radar measurement and road reconstruction and expansion CAD (computer-aided design), designing flat, longitudinal and transverse cross sections of a road, comparing and selecting schemes, and outputting final design drawings and charts.
Owner:CCCC SECOND HIGHWAY CONSULTANTS CO LTD

A lightweight forward design method and system for automobile structure based on multiple performance constraints

ActiveCN109063389AImprove the level of positive developmentSolve high time-consuming problemsGeometric CADInternal combustion piston enginesElement analysisStrain energy
A lightweight forward design method and system of automobile structure based on multi-performance constraints is disclosed. The finite element analysis model of automobile body structure is established by using finite element modeling technology. The typical force transfer path of automobile structure is identified by using topology optimization technology and the bending/torsional rigidity performance of automobile body is taken as constrained working condition, and lightweight design in conceptual stage is carried out. Then the strain energy analysis and the material thickness sensitivity analysis are carried out by using the sensitivity analysis technology, and the weak links and the critical design area of the vehicle body are found. Topography optimization is used to improve vehicle performance; Finally, based on business integration optimization software, The multi-performance target of automobile body is analyzed by integrated simulation, and the correlation between design parameters and performance, performance and performance is studied by using DOE sampling and data mining technology, and then the lightweight design of automobile body structure considering multi-disciplinary performance is carried out, which reduces the quality of automobile body structure, improves product performance, shortens R D and manufacturing cycle, and saves cost.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD

General signal processing board card based on multi-core DSP (digital signal processor)

The invention discloses a general signal processing board card based on a multi-core DSP (digital signal processor). An FPGA (field programmable gate array) serves as a master control core, and two multi-core DSP chips are connected through a high-speed serial bus and supportable to SRIO (serial rapid input / output) and PCIE (peripheral component interconnect express) protocols. Each DSP is connected with an expandable external memory and a gigabit Ethernet interface, and the DSPs are connected mutually through the high-speed serial bus and supportable to Hyperlink, SRIO and PCIE protocols. The FPGA and a VPX connector are mutually connected through a gigabit transceiver and supportable to SRIO, PCIE and Ethernet protocols. Mounting positions of an external memory chip, a DSP chip and an FPGA chip on a printed board of the general signal processing board card are compatible positions allowing placement of other chips in the series respectively and accord with 6U standards in size. The problems of poor universality, small data throughput, low storing rate and low processing speed of existing signal processing board cards are solved, and the general signal processing board card has the advantages of quickness in processing, high storing rate, large data throughput and high universality and can be widely applied to fields of communication, radar, guided missiles, remote sensing, image processing and the like.
Owner:XIDIAN UNIV

BIM-based assembly building forward deepening design method

PendingCN108763710AFast agingReduce forward and reverse iterationsGeometric CADDesign optimisation/simulationDesign cycleData information
A BIM-based assembly building forward deepening design method is provided. The method comprises the following steps: determining design parameters of an assembly building according to design requirements of construction engineering, structural engineering, HVAC engineering, and electromechanical engineering, and generating an editable geometry and data information model; performing assembly component disassembling on the geometry and data information model generated in the deepening design software, and checking component parameters, so that the component size and weight meet the requirementsfor production, transportation, and installation; performing modeling on the protruding bar, the component bracing, the formwork, and the protective frame of the assembly component, and performing dynamic collision inspection on the installation of the assembly component; performing new collision inspection, and performing non-extension rib modeling of the component after there is no collision conflict; automatically generating an assembly building construction drawing and a component drawing by using a BIM drawing output module, and generating a component production material list; and finally, deriving a deeply designed BIM model to assist the mold design. According to the method provided by the present invention, the design cycle is shortened, and coordination of various professions is facilitated.
Owner:GUANGDONG JIAN YUAN CONSTR ASSEMBLY IND CO LTD

Frequency conversion power source based on digital signal processor controlling

The invention relates to a variable-frequency power source based on the control of a digital signal processor, which comprises a switch power source module, a control circuit, a circuit for isolating and shaping pulse-width modulating signal, IPM inverting circuits, a circuit for detecting and protecting busbar voltage, a rectification input slow-start circuit, a communication circuit, an interface circuit for isolating and inputting parallel signals and an human-computer interface circuit for displaying the key. The invention adopts the structure of a single digital signal processor (DSP) coupled with the double IPM inverting circuits, provides two paths of independent variable-frequency power sources for two sets of asynchronous motors at the same time and carries out independent speed regulations to the two sets of asynchronous motors. The variable-frequency power source of the invention has the advantages of small volume, low power consumption, high reliability and being convenient for bulk production, etc., and adopts an appropriate switch frequency and an advanced voltage space vector pulse width modulation algorithm (SVPWM), thereby lowering the noise during the operation of the asynchronous motors and increasing the voltage utilization rate, with obvious effect on energy saving.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI

Optimization design method of composite material wing panel

The invention discloses an optimization design method of a composite material wing panel. The optimization design method comprises the following steps: (1) carrying out finite element simulation modeling on the main structure of a wing; (2) applying a load and boundary condition to a finite element wing box section model; (3) calculating an integral wing box finite element model, and extracting the internal load of a structure; (4) designing a layup library, and calculating the laminate attributes of all layers in the layup library to obtain a rigidity matrix and an equivalent elastic modulus; (5) aiming at the calculation requirements of different structural unit initial dimensions and different failure modes of a skin stringer to carry out secondary distribution calculation on the load; (6) calculating the design allowable value of each structure failure mode of the panel; (7) calculating the safety margin of each BAY of a panel structure; (8) setting a maximum slope rate of panel layup arrangement and an adjacent area laminate throwing layer, setting the Poisson ratio difference value coefficient and the stiffness ratio of the stringer and the skin, and regulating the layer if a design range is not met; (9) if the design does not meet weight requirements, requiring to circularly carrying out the steps (1) to (8) to regulate the lay and the dimension until structure weight requirements are met. According to the method, the design and optimization working efficiency of the integral panel of the composite material is improved, and research and development cost is saved.
Owner:AVIC SAC COMML AIRCRAFT

Three-dimensional design method and system for nuclear powder support hanger

InactiveCN102346797AGet rid of the shackles of technologyKeep 3D Models ConsistentSpecial data processing applicationsEngineeringPart type
The invention discloses a three-dimensional design method and system for a nuclear powder support hanger. The three-dimensional design method and system are operated under a PDMS (Plant Design Management System); a nuclear powder support hanger database consisting of a support hanger composition table is hung below a main menu of the PDMS system; the support hanger composition table comprises support hanger types, type description and inner codes; the inner codes are formed according to part types and the part shut sequence forming the support hanger; each support hanger type is in respective one-to-one correspondence to a style picture and the inner code of the support hanger; the design method comprises the following steps of: establishing the support hanger composition table at a first phase according to the type code, the type description and the inner code; generating a preliminary mode of the support hanger at a second phase according to the support hanger description and a corresponding picture; adding a connecting point and a rooting point by setting parameters; and finally, generating a corresponding a support hanger three-dimensional mode, wherein the first phase and the second phase can be continuously and alternatively carried out, or a novel type support hanger in the support hanger composition table during execution at the second phase can be added and modified.
Owner:BEIJING WEIXIHUA HIGH TECH

Method for hydraulically optimizing centrifugal pump under working conditions based on loss

The invention discloses a method for hydraulically optimizing a centrifugal pump under a plurality of working conditions based on loss, which comprises the following steps of: establishing a multi-working condition hydraulic optimization model of the centrifugal pump based on various loss formulae; establishing relationships among various loss coefficients, specific speeds and flows of the centrifugal pump at different specific speeds under the different working conditions by external characteristic experiments; compiling multi-working condition hydraulic optimization programs PCC.exe of the centrifugal pump by adopting Visual C++; integrating the PCC.exe by adopting iSIGHT, taking parameter values of single-point design as initial values, taking heads and power under the plurality of working conditions as constraint conditions, taking maximum efficiency under the plurality of working conditions as a target, and optimizing the centrifugal pump by adopting a global optimization algorithm or combination; and designing a multi-working condition hydraulic model by adopting PCAD according to an optimal solution set obtained in the optimization. The method has the advantages of not only performing multi-working condition hydraulic design on the centrifugal pump according to performance requirements under the plurality of working conditions, but also performing energy-saving alternation on the conventional centrifugal pump.
Owner:JIANGSU UNIV

Aircraft multi-objective optimization method based on self-adaptive agent model

ActiveCN104866692ASave optimization design costImprove approximation accuracySpecial data processing applicationsPhysical planningEngineering
The invention discloses an aircraft multi-objective optimization method based on a self-adaptive agent model, relates to a multi-objective optimization method for treating complex aircraft design, and belongs to the field of aircraft design optimization. According to the aircraft multi-objective optimization method, an integrated preference function is constructed by use of a physical planning method to realize the conversion of the multi-objective optimization problem into a single-objective optimization problem reflecting design preference; next, the self-adaptive agent model is constructed from the integrated preference function and constraint conditions to take the place of a high-accuracy analysis model, and therefore, the problem of great time taken in calculation of optimization design is solved; finally, the constraint problem is converted into a non-constraint problem by use of an augmentation Lagrange multiplier method, and the non-constraint problem is solved by use of a genetic algorithm. The aircraft multi-objective optimization method has the advantages that the solving process of the aircraft multi-objective optimization method taking much time in calculation is simple and efficient, and therefore, a Pareto noninferior solution meeting the requirements of a user can be obtained quickly to shorten the design period of the aircraft, and the design cost is reduced. Besides, the aircraft multi-objective optimization method is high in universality and convenient for program development.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Method for checking electric fitting data of printed circuit board

The invention discloses a method for checking electric fitting data of a printed circuit board, which mainly solves the problem that the electric fitting data of the printed circuit board cannot be automatically checked in the prior art. The method comprises the following steps of: converting automatic design files of electronic design of different structures into normalized files; digitalizing the assembled design specifications of the printed circuit board into process rules for checking, establishing a surface mounting process rule database and storing the process rules; recovering geometric shapes of a substrate and components of the printed circuit board by using visualization technology, and three-dimensionally and dynamically displaying the mounting process of the printed circuit board; checking the assembly properties of the components to be mounted by using the surface mounting process rule database as a drive, and recording the checking results; and classifying the checking results, and outputting the checking results in a figure or graph mode. By the method, the data for the automatic design files of the electronic design of different structures can be automatically checked, and the checking results can be intuitively displayed; moreover, the method can be used for surface mounting production preparation of the electric fitting industry.
Owner:XIDIAN UNIV

Coaxial rigid rotor pneumatic elastic response method

The invention provides a coaxial rigid rotor coupling pneumatic elastic response analysis method, and belongs to a helicopter kinetic analysis technology. The method is characterized in that according to the operation and control characteristics of a coaxial rigid rotor helicopter, a balance equation optimization solution method is built, and an optimization solution is found according to the given target and constraint conditions. According to the characteristic of complicated coaxial rigid rotor flow field environment, a rotor flow field is calculated by using a computational fluid dynamic method based on an Euler/N-S equation; and then, the coupling pneumatic elastic response is calculated by using a computational fluid dynamic/computational structural dynamic loose coupling analysis method. The coaxial rigid rotor coupling pneumatic elastic analysis method has the advantage that when the analysis method is used, balance operation and control parameters, blade response, rotor loads and the like of the coaxial rigid rotor helicopter can be calculated. The method has good analysis precision and engineering applicability; the relying of the development process on the test can be reduced; and the design period and the development cost can be greatly reduced.
Owner:CHINA HELICOPTER RES & DEV INST

CFD (Computational Fluid Dynamics)-based modeling design method for nuclear main pump and designed million-kilowatt-grade nuclear main pump impeller

The invention discloses a CFD (Computational Fluid Dynamics)-based modeling design method for a nuclear main pump and a designed million-kilowatt-grade nuclear main pump impeller, belonging to the technical fields of design and manufacture of pumps. The CFD-based modeling design method for the nuclear main pump is characterized by comprising four steps of: 1, selecting a model pump impeller satisfying similar conditions with a pre-designed pump impeller according to the design parameters of a million-kilowatt-grade nuclear main pump; 2, calculating size conversion coefficients by utilizing a conventional modeling design formula, and selecting 3-4 different size coefficients within a certain range to convert the model pump impeller; 3, carrying out numerical simulation respectively on the 3-4 pump impellers obtained in the step 2, and carrying out logarithm fitting on a relation between the size coefficients and delivery lift to obtain the nuclear main pump impeller meeting requirements; and 4, optimizing the nuclear main pump impeller obtained in the step 3 to complete the design. The invention has the advantages that the design problem of the high-temperature and high-pressure large-flow million-kilowatt-grade nuclear main pump is solved, and a design process is concise, efficient and controllable.
Owner:DALIAN UNIV OF TECH

Turbine disk probability failure physical life predicting method based on Bayes information update

The invention relates to a turbine disk probability failure physical life predicting method based on Bayes information update, which comprises the following steps that 1, failure physical information of a turbine disk is determined in a reliability analyzing method based on physics of failure according to the structural characteristics of the aircraft engine turbine disk; 2, the failure physical information of the aircraft engine turbine disk obtained in step 1 and the existing failure information obtained by maintenance data statistics are analyzed in an FTA (failure tree analysis) /FMECA (failure mode, effects & criticality analysis) method to obtain the main failure mode and the failure position of the turbine disk, and uncertain factors and inaccurate data of the turbine disk facing whole life cycle are collected and cleared up; and 3, a failure physical life predicting model of the aircraft engine turbine disk is established according to the main failure mode and the failure position of the turbine disk obtained in step 2. The method disclosed by the invention has the beneficial effects that the design cycle of the aircraft engine turbine disk can be obviously shortened, the development cost is reduced, and the life reliability of the aircraft engine turbine disk can be obviously improved.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Simulation and demonstration system for design and validation of AFDX (Avionics Full Duplex Switched Ethernet) network and simulation and demonstration method thereof

The invention provides a simulation and demonstration system for design and validation of an AFDX (Avionics Full Duplex Switched Ethernet) network and a simulation and demonstration method thereof, which are used for guiding the design of the AFDX network. The simulation and demonstration system mainly comprises an integrated avionics network design module, a loaded avionics communication task module, a plausibility check and validation module, a simulation module, a loadable configuration file output module, a network demonstration system module, and the like and has the functions of designing the avionics interconnection structure, simulating communication tasks of the AFDX network and validating the designed network topology in the network demonstration system module. The simulation and demonstration method is used for designing the network topology, simulating the avionics communication tasks and demonstrating and validating the designed network to obtain related technical parameters and provide the reference for the design of the AFDX network. The invention provides a more reliable scheme for the design of the AFDX network, shortens the design time, saves the cost, and improves the design efficiency.
Owner:BEIHANG UNIV

Intelligent pipeline arrangement optimization method and system based on differential evolution algorithm

The invention discloses an intelligent pipeline arrangement optimization method and system based on a differential evolution algorithm. The method includes the steps of conducting mathematical modeling on a pipeline to be arranged and arrangement space so as to determine an arrangement object, the constraint condition and the evaluation criteria, coding the arrangement object through polar coordinates and posture vectors, conducting optimization solution on a pipeline arrangement optimization mathematical model according to the differential evolution algorithm, and conducting constraint condition verification and arrangement adjustment on the arrangement optimization scheme obtained through the solution so as to obtain a final arrangement scheme. By means of the intelligent pipeline arrangement optimization method and system based on the differential evolution algorithm, the design cycle can be greatly shortened, optimization performance can be enhanced, the purpose of arranging pipelines on a large scale within limited time can be achieved, and the method and the system have the advantages of being short in arrangement design time, high in optimization accuracy, capable of quantitatively evaluating the arrangement scheme and the like.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI

Response surface based optimization method for single reed structure in novel space deployable hinge

The present invention provides a response surface based optimization method for a single reed structure in a novel space deployable hinge. The method comprises: according to an actual operating environment of the single reed structure in the novel space deployable hinge, establishing a simplified mechanical model; performing equivalent processing on constraint and loading modes of the single reed structure; obtaining a first-five-order buckling mode and a buckling load of the structure based on ABAQUS; introducing an initial geometric defect to obtain a load-displacement curve, a critical buckling load and a stress distribution cloud chart of the structure; obtaining an optimization model with the maximum buckling bearing capacity under stress constraint of the structure; realizing explicit expressions of a constraint and an objective function based on a response surface method, checking the precision of fitting and updating the model; and simplifying the optimization model into a standard quadratic programming model, and then solving the model by a sequential quadratic programming method to obtain an optimal result. The present invention provides a reliable stability analysis method for the single reed structure, thereby shortening design cycle of the novel space deployable hinge, improving work efficiency and reducing design costs.
Owner:BEIJING UNIV OF TECH

Broadband micro-perforated board sound absorber, absorber performance prediction method and absorber structure design method

The invention discloses a broadband micro-perforated board sound absorber, a sound absorber performance prediction method and a sound absorber structure design method. The sound absorber comprises a surface micro-perforated board and a back chamber with unequal periodicity depth, and the back chamber is used for expanding sound absorption bandwidth of the sound absorber. The performance prediction method is used for predicting a sound absorption coefficient frequency spectrum of the sound absorber, through finite element simulation and experiment measurement verification, the performance prediction method is accurate and reliable; the structure design method used for effectively realizing the broadband micro-perforated board sound absorber comprises steps that (1), a depth matrix of the periodic back chamber is designed on the basis of the secondary residual sequence combination arrangement theory; and (2), evaluation is realized on the basis of the performance prediction method, combination of parameters of the sound absorber are sequentially determined, including total sound absorber width of the periodic back chamber, depth of each sub back chamber, board thickness of the micro-perforated board, aperture and perforated percentage. Through the sound absorber performance prediction method and the sound absorber structure design method, the micro-perforated board sound absorber having the broadband sound absorption performance can be accurately, reliably and simply designed.
Owner:SOUTHEAST UNIV

Calculating method for short-circuit current on direct current side of MMC-MTDC (modular multi-level converter-based multi-terminal direct-current transmission system)

The invention provides a calculating method for short-circuit current on the direct current side of an MMC-MTDC (modular multi-level converter-based multi-terminal direct-current transmission system). The calculating method comprises the steps of (1) calculating an MMC-MTDC direct-current network, and taking calculated steady-state operation current as a steady-state component of the short-circuit current; (2) performing equivalent conversion to obtain an equivalent passive circuit corresponding to an MMC; (3) calculating a fault component of the short-circuit current according to the MMC equivalent passive circuit, a direct-current power transmission line and a fault point direct-current voltage source equivalent calculating network; (4) adding the steady-state component and the fault component to obtain a final short-circuit current calculated result. Therefore, on the premise of guaranteeing the effectiveness, the efficiency for calculating the short-circuit current on the direct current side of the MMC-MTDC is obviously improved; due to the use of the method disclosed by the invention, the time for checking the requirement on the performance of a direct-current circuit breaker can be obviously shortened, so that the period for planning and designing the whole MMC-MTDC engineering is shortened; the calculating method has an important engineering practical value.
Owner:ZHEJIANG UNIV +1

Method for analyzing static strength characteristics of turbomachinery blade based on CPU+GPU heterogeneous parallel computing

ActiveCN106570204AShorten the design cycleAccurate static strength characteristic analysis resultsGeometric CADDesign optimisation/simulationElement modelParallel algorithm
The invention discloses a method for analyzing static strength characteristics of a turbomachinery blade based on CPU+GPU heterogeneous parallel computing. The method comprises the following steps of firstly, establishing a finite element model, computing the total stiffness matrix of the model, then, computing the centrifugal load vector and the pneumatic load vector of the turbomachinery blade, performing displacement constraint and coupling of a node, and correcting the total stiffness matrix; and then, solving an equation set formed by the total stiffness matrix and the load vector in parallel by using CPU+GPU, obtaining a node displacement vector, then, computing the principal strain and the VonMises equivalent stress, drawing a distribution cloud picture, and finally, performing safety check. By means of the method disclosed by the invention, for static strength analysis and design of the turbomachinery blade, project planners can perform operation conveniently; simultaneously, due to an adopted CPU+GPU parallel algorithm, the computing speed of a finite element method can be effectively increased; an accurate and rapid blade static strength characteristic analysis result is provided for design of the turbomachinery blade; and the design period of the turbomachinery blade is greatly shortened.
Owner:XI AN JIAOTONG UNIV
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