245results about How to "Short design cycle" patented technology

The invention provides an anti-unmanned aerial vehicle detection system and a control method thereof. The system comprises a camera provided with an optical lens, a displayer, an automatic tracking servo mechanism controlling the camera to move, a radar device, a main controller, an interference unit, and an image identification decoder storing unmanned aerial vehicle image information. By the adoption of a photoelectric surveillance radar device combining the radar device with an optical tracking system, radar detection, optical image identification and electromagnetic interference are integrated, and the system and method play an important role in improving organic integration of unmanned aerial vehicle monitoring, the optical system and the radar device.

The invention discloses a method for designing a water-spraying boost pump hydraulic model for an efficient and large-power-density ship. The method comprises the following steps that type selection design of water-spraying boost pump hydraulic parameters is conducted, two-dimensional axial face projective geometry is determined, three-dimensional geometrical shapes of an impeller and guide blades are obtained according to a parameterized ternary reversal design method, a three-dimensional geometrical shape of a shrinkage nozzle is obtained through circumferential rotation, the three-dimensional geometrical shapes of the impeller, the guide blades and the shrinkage nozzle are combined to obtain the water-spraying boost pump hydraulic model. The method has the outstanding advantages that the design period is short, the design quality is high, and the water-spraying boost pump hydraulic model which has the advantages of being high in efficiency, compact and large in power density can be rapidly and reliably designed. The geometrical shapes of the impeller and the blades are obtained according to the parameterized ternary reversal design method, so that on the condition that the water-spraying boost pump hydraulic model is kept compact, the efficiency is improved, cavitation is restrained, and the power density is increased in the researching and developing process of a high-speed ship water-spraying boost pump.

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.

The invention discloses a design method of a hot-rolling strip steel rolled cooling line. The design method comprises the following steps of: determining the header arrangement mode of the cooling line; calculating the upper header flow rate; calculating the lower header flow rate; calculating the side-spraying header flow rate; calculating the hot flow density; calculating the cooling capability of a single upper header and a single lower header; calculating the total water quantity; checking the flow rate; drawing a cooling line equipment arrangement diagram; simulating the cooling process; and generating the design information report. In the design, the method of combining the rolling procedure and the equipment structure is adopted, so the whole design process is very clear. The design method can adopt the computer program for calculation, so the design period is short. The design method adopts the calculation method of combining the theoretical model and the field actual data, so the equipment parameter calculation is accurate. The design method has the advantages that the calculation result practicability is fully considered, and the complete one-package service can be provided from the cooling line design and the process calculation to bidding document making and the like.

The invention relates to the field of control over a reconfigurable modularized flexible mechanical arm, in particular to a trajectory tracking control method based on parameter optimization and usedfor the reconfigurable modularized flexible mechanical arm. The method includes the steps that a single-joint intelligent agent flexible mechanical arm system model is established, linear combinationof a joint motor rotating angle and a flexible mode variable is used as output of a flexible mechanical arm system by utilizing the thought of redefining the output, and through input-output linearization, the single-joint flexible mechanical arm system is decomposed into an input-output subsystem and a zero-dynamic subsystem. The input-output subsystem can track an expected reference trajectory within limited time by adopting self-adaptive dynamic terminal sliding-mode control, multi-objective optimization design is carried out on design parameters lambda<0i> and lambda<1i> by adopting an NSGA-II algorithm, the zero-dynamic subsystem of the flexible mechanical arm system is asymptotically stable near a balance point, and therefore the tracking requirement of the whole flexible mechanicalarm system on the expected trajectory is met; the trajectory tracking control method has better robustness for nonlinear uncertainty of the system.

The invention discloses an antenna structure and a designing method thereof, wherein the antenna structure comprises a line array radiating unit and an electric feeding network. The electric feeding network has an axis symmetric structure. The electric feeding network comprises an equal-power and unequal-power substrate integrated waveguide power divider and a substrate integrated waveguide phase shifter. The radiating unit is connected with the end of the axis symmetry substrate integrated waveguide feeding network. The antenna of the invention realizes a middle-and-long-distance integrated antenna based on the substrate integrated waveguide structure. The antenna can simultaneously satisfy requirements for testing the middle distance and the long distance of a radar, and switching between a plurality of transmitting antennae by means of a switch is not required. Furthermore the antenna structure has advantages of compact structure, low cost, small dimension, etc.

The invention provides a type selection design method of a main controllable pitch propeller used for a ship, belonging to ship design and manufacture field. According to the existing parameters of a hull, a host machine and a gearbox, the diameter H of a hub is selected; furthermore, the blade diameter D, the blade area ratio EAR, the pitch ratio P/D, the efficiency Eta, and the blade number z of the controllable pitch propeller are determined according to the maps of fixed pitch propeller series; the mass and the movement inertia of the controllable pitch propeller blade are determined according to experimental formula; strength checking and bearing capability checking to the hub are carried out, and the application performance requirement of the controllable pitch propeller is well met. The invention obtains the type selection design proposal, with the advantages of good safety and reliability, small design fund investment, simplified program, short design period, good system performance, convenient data processing, convenient management with computers, exact and reliable data, smaller error compared with post-design, little changes on the parameters determined by the type selection design in the process of the post-technology design of the controllable pitch propeller, convenient adjustment, thus simplifying the post-design flow, shortening the period and improving the efficiency.

A system and method for performance modeling of integrated circuits is provided. A method for performing timing analysis on an integrated circuit is provided, the integrated circuit having a timing path. The method includes computing a number of non-common timing path elements in the timing path, assigning a timing de-rate factor to the timing path based on the number of non-common timing path elements, and computing a timing analysis on the integrated circuit using the assigned timing de-rate factor.

The invention relates to the technical field of communication and in particular discloses a compact type ultra wide band polarizer. The compact type ultra wide band polarizer comprises a circular waveguide port, a transition chamfer square waveguide and an ultra wide band phase shifter, wherein the circular waveguide port is connected with the ultra wide band phase shifter by virtue of the transition chamfer square waveguide, the circular waveguide port is arranged at the two ends, one end is an input circular waveguide port, and the other end is an output circular waveguide port; the transition chamfer square waveguide is a square waveguide with four ridges chamfers; and the ultra wide band phase shifter is a square waveguide the side wall of which is provided with a horizontal ridge and a vertical ridge, and the horizontal ridge is symmetrically distributed on the two opposite side walls of the square waveguide along the axial direction of the square waveguide. In the invention, a simple and compact structure is adopted, linear circular polarization on two direction field vectors are smartly realized, technical indexes of amplitude and phase for a circular polarizer to be orthogonal with two field components are met, and the compact type ultra wide band polarizer disclosed by the invention has the advantages of compact structure, small volume, light weight, low cost, easiness in processing, easiness in tuning, high efficiency, high power capacity and the like.

The invention discloses a real-time database backup system and a real-time database backup method based on an FPGA (field programmable gate array) and relates to the FPGA and a database backup disaster recovery technology. Database operating data flows are positioned into two or multiple 1G RJ45 interfaces through the high-speed copying function of an FPGA board and are transmitted to different data servers, and databases in two or multiple data servers are simultaneously and consistently operated to realize database real-time backup.

The invention discloses an optimization design method for a shape of an inner cavity of a turbine disc with a radial plate based on a hyperelliptic curve, and is used for solving the technical problem of long design cycle of the conventional optimization design method for a multi-arc-section curve shape. The invention adopts the following technical scheme: the method comprises the step of carrying out finite element modeling, analyzing and sensitivity solving on the cross section of the turbine disc with the radial plate by hyperelliptic curve boundary conditions and carrying out optimization iteration according to the obtained sensitivity information until a final design result is obtained by convergence. According to the method, the profile of the initial shape of the inner cavity of the turbine disc is effectively subjected to optimization design, the design cycle is short, and better horizontal stress distribution is obtained; the maximal stress after the optimization is 769.47 MPa and is reduced by 47.32% than the stress of 1460.75 MPa before the optimization; the maximal stress after the optimization by the method provided by a literature is 842.7 MPa and is reduced by 7.6% than the stress of 912 MPa before the optimization; and the method provided by the invention is low in stress concentration level of an optimization result and is remarkably superior to the background technology.

The invention discloses a composite material connecting structure. Specifically, the invention provides a reinforce sheet prepared by designing the fiber track according to the principle stress borne by the composite material connecting structure and a preparation method of the reinforce sheet. Compared with the common fabric reinforce sheet in the prior art, the reinforce sheet has the advantages of simple and convenient design, excellent reinforcing effect, no need of cutting, applicability for mass production and the like. By using the reinforce sheet to reinforce the opening part of the composite material connecting structure, the forming process is simple and flexible, the reinforcing efficiency is greatly improved, and the extremely board application prospect is provided.

The invention discloses an ESD (electrostatic discharge) protection circuit optimization method of an RFIC (radio frequency integrated circuit) based on network S-parameter extraction, and mainly solves the problems of poor accuracy and universality of the existing equivalent method and model construction method. The method mainly comprises the following steps: determining the parameters of an ESD protection device and a matching network of a port to be protected of the kernel RFIC; constructing a matching network with the ESD protection, and extracting S parameter through mixed-mode simulation; embedding the matching network into the kernel RFIC for optimized adjustment; returning and correcting the element parameters in the matching network to achieve further optimized design; and carrying out ESD testing to obtain the key parameter of the protection level. The method can accurately extract the device characteristics without constructing the complex numerical model, has higher accuracy and universality, and is suitable for the applicability evaluation and design optimization of the ESD protection device in a high-frequency circuit.

The invention discloses a device and a method for the implementation of AVS video decoding by using SOPC, belonging to the field of video decoding. The device comprises an Nios II microprocessor module and other modules. The Nios II microprocessor module is connected with a DMA controller module and other modules; a SDRAM controller module is connected with the DMA controller module and other modules as well as SDRAM; a video output controller module is connected with the SDRAM controller module and a video output module; the DMA controller module is connected with an AVS co-processing module. The Nios II microprocessor module executes software decoding control, the AVS co-processing module executes AVS hardware decoding, other modules executes auxiliary decoding, and all the modules are hung on a bus and packaged in FPGA for data interaction. The device is reasonable in software/hardware division, capable of varying software decoding procedures by modularized design and of supporting the design with other standards by hanging other co-processor cores, and has high expandability, universality and flexibility.

The invention discloses a determining method of designed shrinkage of a hollow turbine blade investment casting mold, and relates to hollow turbine blade investment casting molds. The method is particularly applicable to designing of a mold cavity of a hollow turbine blade investment profile mold. A deformation model of hollow blades is obtained through a finite element method, by cutting out a series of two-dimension cross sections on a blade deformation model and a design model, and making a section line discretized into points, distances among the corresponding points are obtained to builda two-dimension displacement site; bending and torsion deformation and shrinkage deformation included in the displacement site are separated. The inner cross section and the outer cross section of theblades are subjected to line connection processing, afterwards blade stopping structures and non-stopping structures are recognized, then the wall thickness of the hollow blades is calculated, and bycalculating shrinkage of different structures, the distribution of the nonlinear shrinkage is built. Finally a shrinkage model is subjected to least square fit of cubic polynomial, and the determination of the designed shrinkage of the investment casting mold is achieved. The finished product rates of the turbine blades are greatly increased, the cycle for mold testing is shortened, and the frequency for mold testing is reduced. The determining method has the advantages of being short in design cycle, high in precision and high in efficiency.

The invention discloses an SAR ADC-based calibration method and an SAR ADC system. The method comprises the following steps: sampling the same input signal twice, and superposing disturbance signals opposite in direction on the same input signals sampled twice to obtain two quantitative results; and subtracting the two quantitative results in a numeric field, and adjusting weight value of each bitcapacitor in a capacitor array through a least mean square (LMS) algorithm to drive error to approach 0. The method is not only fast in calibration speed and high in precision, but also can realize on-chip integration.

The invention discloses a product detailed design model automatic generation method based on SysML drive, which comprises the following implementation steps of: 1) inputting a system level design model of a product; 2) respectively establishing a SysML meta-model and an Express meta-model according to the system level design module; 3) establishing a mapping relation between the SysML meta-model and the Express meta-model to get a mapping model; 4) generating an executable drive engine according to the SysML meta-model, the Express meta-model and the mapping model, and then, executing the executable drive engine to obtain model exchange data based on the Express model; and 5) generating boundary representation of the product design model according to the model exchange data based on the Express model, and generating a product model data exchange standard file of the product according to the boundary representation of the product design model. The method provided by the invention is quick in development, short in design cycle, standard in design process, high in model reusability and convenient in consistency detection.

The invention provides an RPMC-comprising (replay protection monotonic counter-comprising) enhanced flash chip and a packaging method thereof. The RPMC-comprising enhanced flash chip comprises a flash, an RPMC, and a memory chip, wherein the flash and the RPMC are packaged together and the memory chip is connected with the RPMC. Both the flash and the RPMC comprise respectively independent controllers. Same IO (input and output) pins in the flash and the RPMC are interconnected and are connected to a same external shared pin of the chip. Both the flash and the RPMC further comprise internal IO pins. The RPMC and the memory chip further comprise signal transmission IO pins. By the RPMC-comprising enhanced flash chip, the problems of high complexity, long cycle, high cost and large chip area in chip design are solved.