470results about How to "Improve design accuracy" patented technology

The present invention belongs to the technical field of concrete construction and particularly relates to a design method for a mixing proportion of a self-compacting concrete mixture. The method comprises the steps of: determining a performance design target; determining mixing strength and a water-binder ratio; determining densest gradation (or a sand rate) of aggregates and void ratios of different packing states; determining the usage amount of binding materials and mixing water; determining the usage amount of the aggregates; determining the usage amount of additives; determining the actual adding amount of the mixing water; and the like. According to the method provided by the present invention, aimed at blindness of material selection during self-compacting concrete mixing proportion design in the prior art, based on a fundamental theory of particulate dense packing and a composition rule of reaching a densest packing state of solid particulate materials with different particulate diameters, a mixing proportion of different materials is determined by an actually measured densest packing state, and relationships are established between the material mixing proportions corresponding to different densest packing states and expected self-compacting performance grades of the mixture, so that the design method used for the mixing proportion of the self-compacting high-performance concrete mixture and based on a use performance as a target is constructed.

The invention discloses a home simulation design system.The system comprises a home housing type simulation design subsystem, a home decoration simulation design subsystem, a home simulation display subsystem and a two-dimensional code generation subsystem, wherein the home housing type simulation design subsystem conducts simulation design on a home housing type to obtain a three-dimensional home housing type model; the home decoration simulation design subsystem is used for simulation design of internal decoration of the three-dimensional home housing type model to obtain a home decoration model; the three-dimensional home housing type model and the home decoration model are displayed through two-dimensional planar graph, three-dimensional navigating, three-dimensional video cartoon and / or panoramic images; the two-dimensional code generation subsystem generates a two-dimensional code with a network address through display modes.By means of the system, a client can easily and conveniently make home design requests and finish design through a computer network, home housing type decoration effects can be displayed in a three-dimensional mode, and scene experience is achieved.A simple home simulation design means easy to use is provided for the client, design precision is high, simulation scenes are vivid, and the system conforms to the tendency of personalization, networking and convenience of house simulation design.

The invention discloses a three-dimensional garment modeling and pattern designing method based on draping. The method comprises the following steps of: reading a three-dimensional human model represented by a triangular grid to generate a three-dimensional garment model; generating a contour line of the three-dimensional garment model, and modifying the shape of the contour line; drawing suture lines on the surface of the three-dimensional garment model to divide the surface of the three-dimensional garment model into a plurality of areas of which each is a three-dimensional pattern; selecting a three-dimensional pattern, generating the three-dimensional grid corresponding to the three-dimensional pattern, converting the three-dimensional grid into a two-dimensional garment pattern, and setting a suture schematic drawing of the two-dimensional garment pattern; re-discretizing a boundary line of the two-dimensional garment pattern into a polygon consisting of straight line segments with uniform lengths, and triangulating the two-dimensional garment pattern; and computing the position of the triangulated two-dimensional garment pattern in a three-dimensional space to obtain a final three-dimensional garment model, and finally simulating hanging effects of three-dimensional garments. The method is high in speed and relatively higher in accuracy.

The invention relates to a highway route CAD aided design system. The current specialized CAD software developing mechanism and group in China are weak; and compared with foreign excellent software, the traditional software level has later start and larger difference. In the middle and late 70s of 20th century, relevant highway scientific research units, institutions for higher learning and highway measuring and designing departments start to research and develop a road design calculation and optimization program and achieve an initial result; the developed program mainly substitutes a designer to carry out data processing and calculation due to the limitation of the current development environment (hardware and support software), and the program developed at the stage has single functionand narrower application range and is not a complete program system. The highway route CAD aided design system comprises comprehensive design of the plane, the longitudinal section and the cross section of a route, tabulation, drawing, digital ground model operation and database operation. The invention is applied to the field of construction of road bridges.

The present invention discloses a home decoration design system and method. The home decoration design system comprises a decoration product design subsystem for designing decoration product models; a home decoration laying subsystem for simulating the decoration process; a home decoration storage subsystem for storing data information; a home decoration presentation subsystem for clients to experience three-dimensional scenes; a decoration data generation subsystem for generating drawings and decoration budget sheets; a two-dimensional code generation subsystem for the clients to preview the home decoration effect; and a prototype room database subsystem for the clients to directly take existing home decoration model cases. A simple and easy home decoration design means is provided for the common clients, design precision is high, simulation scenes are lifelike, and the home decoration design system and method are suitable for the customized, networked and convenient trend of the home decoration design.

The invention provides a method in the field of automobile computer aided design, particularly a vehicle frontal collision finite element model rapid-matching method. In the method, based on the conventional method, a process of establishing a reverse finite element model is added, and reverse and positive related parameters in a simulation process are compared to rapidly determine a critical area determining matching accuracy in the model; and then a conventional modeling method is performed, and a positive model is regulated by utilizing parameter values of the critical area obtained by the comparison between the reverse and positive related parameters so as to be rapidly matched well. By the method, the designing period of a vehicle frontal collision finite element model is effectively shortened, and the designing accuracy is relatively higher.

The invention discloses a double-clutch type automatic transmission fork shifting gear engaging force dynamic self-adapting method. The fork shifting is divided into a plurality of stages during the gear shifting process. The double-clutch type automatic transmission fork shifting gear engaging force dynamic self-adapting method comprises the following steps of (1) obtaining ranges of a maximum value and a minimum value of a preset shifting fork movement speed at different stages during fork shifting gear engaging; (2) computing a shifting fork real-time movement speed and confirming a maximum value and a minimum value of the shifting fork movement speed at the different stages during the fork shifting gear engaging; (3) comparing the maximum value and the minimum value of the shifting fork movement speed with the range of the maximum value and the minimum value of the preset shifting fork movement speed at the same stage, obtaining the fork shifting gear engaging force to be adjusted and the stage and recording and adjusting the fork shifting gear engaging force when the shifting fork gear shifting achieves a corresponding stage. The double-clutch type automatic transmission fork shifting gear engaging force dynamic self-adapting method is applied to control of a double-clutch automatic transmission and achieves vehicle gear shifting noise optimization.

The present invention relates to a microstrip band pass filter and, more specifically, to a microstrip band pass filter using end-coupled stepped impedance resonators that can be used in a millimeter wave band, wherein the microstrip band pass filter comprises: a dielectric substrate; a conductor plate located on a lower surface of the dielectric substrate; and an input terminal, a plurality of SIRs and an output terminal located on an upper surface of the dielectric substrate in series, wherein the input terminal, the plurality of SIRs and the outputs terminal are conductors and end-coupled through gaps, whereby the microstrip band pass filter has a good attenuation characteristic and a narrowband characteristic, and is insensitive to the manufacturing error, and a fine frequency transition can be made without distortion just with width adjustment of the low impedance transmission line of the SIR.

The invention discloses a database based complex-contour aircraft distributed heat environment parameter prediction method and belongs to the field of aircraft heat environment design. The method comprises the steps that an aircraft surface heat flow database is established, order reducing processing is conducted on the database by utilizing a POD method to obtain orthogonal basis vectors of the database, and aircraft surface heat environment parameters can be predicted along a ballistic trajectory by combining with a corresponding basic coefficient interpolation method. The method can really reflect the space distribution characteristics and interference characteristics of the aerodynamic heat environment for all points on the surface of a complex-contour aircraft. Value result comparison shows that the method can remarkably improve the computational efficiency, and prediction precision is not lost. A surface distributed heat flow is provided for calculation of a heat proof temperature field through the points along the ballistic trajectory, more exquisite temperature distribution can be obtained, and accordingly the design level of a whole heat preventing and insulation system is improved.

The invention relates to an electric power measurement multifunctional instrument system and a method for measurement. The electric power measurement multifunctional instrument system comprises an electric power measurement module for acquiring and measuring external three-phase voltage and current and transmitting measurement data to a microprocessor module, an LED driving module for driving an LED display screen, the LED display screen for displaying the measurement data output by the microprocessor module, an input module for acquiring input switching value and / or keystroke input value for the microprocessor module, an output module for outputting and performing switching in, switching off, CT overload current warning, and the like to a relay, a storage module for meeting requirements on storing system setting parameters, accumulated electrical degree value and standard check value of the electric power measurement module, and the microprocessor module for performing control operations of initializing the system, responding to timer interruption, reading electric quantity data, storing set data, displaying the electric quantity data, and the like.

The invention discloses a space manipulator modeling method based on different geometry. On the foundation that each level rigid body zero position of a space manipulator system is selected, initializing conditions such as a zero position joint vector, a centroid joint vector and an initial vector are calculated and given, and a matrix related to initial parameters and a coordinate position matrix are calculated. The generalized velocity of each connecting rod is calculated through forward recursion, and the generalized force of each connecting rod is calculated through reverse recursion. Each quantity is substituted into the matrixes, and a kinetic equation compact in form is written down. The model has the advantages of being uniform in modeling form and small in operating amount, improving calculation efficiency and accuracy of the space manipulator modeling, and improving the designing accuracy of the space manipulator. The space manipulator modeling method based on differential geometry can be applied to modeling of other space multi-rigid-body systems.

The invention discloses a method and device for testing the heat dissipation performance of a radiator assembly and belongs to the field of performance testing of an automobile cooling system. The method includes the first step of determining operating parameters of the radiator assembly under a real vehicle working condition through an engine and gearbox bench test, the second step of enabling the radiator assembly to simulate the real vehicle working condition to carry out testing on a wind tunnel and determining testing operating parameters of the wind tunnel of the radiator assembly on the premise of the first step, the third step of determining heat dissipation performance parameters of the radiator assembly according to the operating parameters under the real vehicle working condition and the testing operating parameters of the wind tunnel, and the fourth step of comparing the heat dissipation performance parameters with standard heat dissipation performance parameters, and determining that the radiator assembly meets the heat dissipation requirements of an engine and a gearbox if the heat dissipation performance parameters are larger than the standard heat dissipation performance parameters. Through the method and device, the real vehicle working condition can be simulated, and heat dissipation performance testing can be carried out on the radiator assembly with a built-in oil cooler, so operating parameters of the oil cooler and the operating parameters of a radiator can be accurately matched, and the accuracy degree of the heat dissipation performance parameters of the radiator assembly can be improved.

The invention relates to a feature-based quick bone plate design method. The method is characterized in that the method includes the following steps that 1, an interesting region is selected through border lines according to a bone model, and surface reconstruction is conducted on the interesting region; 2, feature definition and parameter setting are conducted on the reconstructed surface region, and a surface feature is generated; 3, a bone plate entity feature is built through the generated surface feature, a mapping relation between the surface feature parameters and the bone plate entity feature parameters is built, and later quick editing and altering are facilitated. The feature-based quick bone plate design method provides a certain theoretical basis for the bone plate design, particularly the individualized design of bone plates, the design cycle of the bone plates is shortened, and design efficiency is improved.

The invention discloses a method for designing a wireless power transmission device. The method comprises the following steps of: A, winding and installing a transmitting coil, a transmitting end amplifying coil, a receiving end amplifying coil and a receiving coil of the wireless power transmission device according to the design requirements and the given conditions; B, measuring electric parameters of the transmitting coil, the transmitting end amplifying coil, the receiving end amplifying coil and the receiving coil; C, establishing a multi-coil coupled wireless power transmission device system circuit model based on a mutual inductance model by using the actually measured electric parameters of the coils; D, setting an optimization object function and constraint conditions, and establishing a nonlinear programming model; E, solving a nonlinear programming problem to obtain a resonance compensation capacitance value; and F, configuring a capacitor according to the calculated resonance compensation capacitance value.

The invention belongs to the technical field of mechanical designs and relates to a motor vehicle drive axle design method. The motor vehicle drive axle design method includes performing attribute matching comparison on instance features and design requirements according to user's design parameters, calculating similarities of all instances, extracting the instances with the maximum similarities as base models of variant designs, and modifying the instances with the maximum similarities, wherein amended solutions are used as new instances which are to be stored in an instance base. The motor vehicle drive axle design method is reliable in design principle, advanced in design thinking, high in design accuracy, short in time, environmental friendly, and capable of saving man-human resources, and effectively improving design efficiency and design qualities.

The invention discloses a method and device of aero-photography field work. The method comprises the following steps: according to the range of measuring zone, obtaining the DEM data of a region to be measured; obtaining the intersection point between an initial air line direction and the measuring zone so as to determine the start point coordinate and the end point coordinate of the air line; setting the start point coordinate as the initial exposure point of the air line, according to the DEM data, calculating the coordinates of each exposure point in the air line in sequence until the calculated coordinate of the current exposure point is larger than the coordinate of the end point of the air line, determining the current exposure point as the last exposure point of the air line; taking the air line as the initial air line, laying air lines in sequence by taking the overlapping degree, which is calculated according to the DEM data, as the constraint until the lateral direction coordinate value of the current air line is not in the range of maximal coordinate value and minimal coordinate value of the lateral direction of the measuring zone, and determining the current air line as the last air line in the measuring zone.

The invention discloses a method for automatically converting data among kinetic analysis, three-dimensional modeling and finite-element analysis software, which comprises the steps of: starting mechanical system kinetic analysis software, and loading a virtual prototype to carry out kinematics and dynamics simulation; generating a CMD command file recognized by the mechanical system kinetic analysis software in the three-dimensional modeling software by using relevant plug-ins; deriving a mode neutral file corresponding to a model in the finite-element analysis software; reading the generated CDM command file and the mode neutral file by using the mechanical system kinetic analysis software and carrying out rigid-flexible mixed simulation; circularly correcting and flexing the model, and displaying a better result on screen and storing data files. The method for automatically converting the data is applied to complex mechanical system design and analysis, which can improve the design accuracy and the design efficiency of products.

The invention provides a springback compensation method for creep age forming. The method comprises the following steps: Step S100, based on MSC.MARC commercial finite element software, constructing creep age forming finite element simulation; Step S200, weighting a springback iterative compensation process based on a molding surface of a finite element simulation result; and Step S300, considering a reverse compensation process of high temperature molding surface thermal expansion effect. The method considers the influence of the strength of a component on surface compensation, the influenceof a component feature structure on surface compensation, and reverse compensation of thermal expansion of a high temperature molding surface. A component formed by the model can still meet the engineering error requirement after being cooled.

The invention discloses a micro-miniature multi-wing bionic flapping wing air vehicle and relates to the field of miniature air vehicles. The micro-miniature multi-wing bionic flapping wing air vehicle particularly comprises a chassis, four swing arms, a motor, two gears a, two gears b, a gear c, four connecting rods and four flapping wings. The motor is fixed at the center of the chassis; the gear c is mounted on an output shaft of the motor and engaged with the two gears b simultaneously; each gear b is engaged with the corresponding gear a; one ends of every two connecting rods are hinged together through the corresponding gear a, and the other end of each connecting rod is fixedly connected with the corresponding swing arm; meanwhile, the other end of each swing arm is fixedly connected with the corresponding flapping swing; and the swing arms drive the flapping swings to achieve low-frequency reciprocating flapping and produce aerodynamic lifting force in the vertical direction. The gears and a connecting rod mechanism are used to conduct transmission, manufacturing is simple, and higher design precision is easily obtained; and compared with a single pair flapping wing air vehicle, the effect among the multiple flapping wings can increase the lifting force, the high lifting force mechanism of insects is fully utilized, and higher efficiency is achieved.

The invention relates to a power tower three-dimensional solid model generating method. The method includes the following steps that (1) according to relative data of an iron tower design result, a three-dimensional iron tower single-line model is built; (2) the built three-dimensional iron tower single-line model is read and corrected; (3) according to serial port data of a tower body main material, tower body main material serial port calculation is conducted, and upper port width, lower port width and slope of each section of tower body main material are obtained; (4) which single line is the tower body main material is judged; (5) according to relations of points and lines of all rods of the tower body and the main material parameters, a connecting face is generated, and an overlapping relation between iron tower rods is determined with the connecting face as a unit; (6) two branch directions of each rod are analyzed, and branch directions of all rods are determined; (7) a preliminary three-dimensional angle steel model is generated; (8) all angle steel nodes are designed to obtain parameter data related to the nodes; (9) the iron tower three-dimensional solid model is generated according to the overlapping relation between the rod parameters and the rods and parameters related to the nodes.

The invention discloses a method for testing the property of a cooling tower. The method comprises the following testing steps of: I, based on a cooling property equation N'=A lambda<m>, establishing a new property equation mode being N<0>=A lambda<m>q<o>tl(delta t / (t2-tau))a; II, selecting testing items, including heat radiation and disperse medium total coefficient of packing, inlet water temperature, atmospheric temperature, packing density and influence of an operation interval of the cooling tower to the cooling property; III, selecting an orthogonal test table L9(3<4>), and respectively testing steam-water ratio lambda, packing density q, tower-inlet water temperature t1 and tower-inlet wet bulb temperature tau1; and IV, analyzing to obtain the primary and secondary sequence of factors influencing the cooling property, and working out a new cooling property equation by adopting multiple regression. The method disclosed by the invention has the credibility being more than 95% weight respect to test of the property of the cooling tower, is low in error and greatly improved in design precision, and provides a more correct instructive method for designing the cooling tower reasonably.

The invention discloses a power amplifier of a distributed two-stack structure considering a miller effect. The power amplifier comprises a distributed two-stack HiFET (High-Impedance, High-Voltage field-effect transistor) amplification network, bias voltage, a grid electrode artificial transmission line considering the miller effect, and a drain electrode artificial transmission line considering the miller effect. According to the power amplifier provided by the invention, a core framework adopts the distributed two-stack HiFET amplification network, which is formed by at least three two-stack HiFET structures; meanwhile, the influence of the miller effect of a two-transistor stack structure on equivalent capacitance of the artificial transmission lines is considered, the accuracy of a circuit design is improved, and the difficulty in later debugging of the circuit is reduced, so that the whole power amplifier acquires a favorable broadband power output capability and a power gain capability, a low breakdown voltage characteristic of an integrated circuit process is avoided, and the stability and the reliability of the circuit are improved.

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.

The invention relates to the technical field of car bodies, and discloses a concept design method for a car body frame. In a car body concept design stage, according to the internal design boundary and the external design boundary of the car body, the envelope geometric model of the car body frame is established, the finite element model of the car body frame is established according to the envelope geometric model of the car body frame, and finally, the topological optimization analysis model of the car body frame is established; the topological optimization analysis model of the car body frame is subjected to iterative solution to obtain the optimal load transferring path of the car body frame; and according to the optimal load transferring path of the car body frame, the concept model of the car body is finally created. Therefore, in the car body concept design stage, effective guidance is provided for the reasonable arrangement of the car body frame, so that local even global defects of the car body structure of a target car due to the past design experiences and the benchmarking design of an engineer can be avoided, and therefore, the design accuracy and the design efficiencyof the car body frame of the car are improved.

A method of predicting overlay failure of circuit configurations on adjacent, lithographically produced layers of a semiconductor wafer comprises providing design configurations for circuit portions to be lithographically produced on one or more adjacent layers of a semiconductor wafer, and then predicting shape and alignment for each circuit portions on each adjacent layer using one or more predetermined values for process fluctuation or misalignment error. The method then determines dimension of overlap of the predicted shape and alignment of the circuit portions, and compares the determined dimension of overlap to a theoretical minimum to determine whether the predicted dimension of overlap fails. Using different process fluctuation values and misalignment error values, the steps are then iteratively repeated on the provided design configurations to determine whether the predicted dimension of overlap fails, and a report is made of the measure of failures.

The invention provides a distribution network three-dimensional scene modeling method based on a mixed reality technology. The method comprises the following steps: S1, image acquisition: carrying outmulti-angle shooting on a distribution network engineering area by adopting an unmanned aerial vehicle; S2, image preprocessing: images shot by the unmanned aerial vehicle are screened, denoised andcalibrated; S3, obtaining feature points: carrying out feature extraction on the preprocessed image; S4, camera calibration: establishing a geometric model of camera imaging, and solving geometric model parameters of the camera; S5, acquiring sparse point cloud: through a calibration result, reversely deriving the three-dimensional positions of the two-dimensional feature points in the image, andreversely deducing all the two-dimensional feature points into a three-dimensional space to form the sparse point cloud; S6, obtaining dense point cloud: processing the sparse point cloud data to formdense point cloud; And S7, surface reconstruction: performing surface reconstruction on the dense point cloud data. The invention provides the distribution network three-dimensional scene modeling method which can improve the design efficiency and reduce the design errors.

The invention relates to an OBM-based road tunnel design method. The purposes are effectively achieved that the operation is convenient, the design precision and the modeling efficiency are improved,the size of a generated three-dimensional model is small, and the demands for splitting and data sorting of a later construction model are easily met. A tunnel three-dimensional terrain, a three-dimensional geological model are created, and tunnel surrounding rock division is conducted; a tunnel three-dimensional route model is established according to route design data; a tunnel cross section isdesigned, and a tunnel cross section template library is created; layout span lines are utilized for arrangement of surrounding rock pile numbers of a tunnel, and tunnel main hole, transverse channeland inclined well models are established; tunnel portal, portal side slope protector, steel bar, steel frame and tunnel anchor rod models are established; tunnel electromechanical, fire fighting, inner and outer prevention drainage and traffic engineering models are established; the transverse channel and main hole models are subjected to trimming modeling, a transverse channel is subjected to portal forming modeling in a main hole structure, the vehicle-passing transverse channel is subjected to sinking cable groove treatment, tunnel emergency stop widening modeling is conducted, and the tunnel model and the geological model are combined for modeling; the tunnel model is split, and tunnel components are coded.

Provided is a hybrid current sensor assembly (1) ncluding a conductor (15) to be connected to both terminals of an external electronic device, a Hall core (111) to which a magnetic field generated by a current flowing in the conductor (15) is applied, a Hall sensor (112) in which a potential difference occurs at both ends thereof due to the magnetic field applied to the Hall core (111), a shunt terminal (122) configured to shunt the current flowing in the conductor (15), and a microprocessor (123) connected to the shunt terminal (122) and configured to measure the current flowing in the conductor (15).

Method and system for conducting design explorations of an integrated circuit are disclosed. In one embodiment, the method includes obtaining a design description of the integrated circuit that includes a virtual design block, creating a representative netlist for representing the virtual design block, where the representative netlist includes one or more soft design models, and each soft design model comprises one or more template cells for modeling a portion of the integrated circuit. The method further includes defining physical attributes for the one or more soft design models in accordance with area requirements of the virtual design block, where the one or more soft design models are described with flexible shape and pin locations, performing design explorations of the integrated circuit using the one or more soft design models and their corresponding template cells, and generating a representative implementation of the integrated circuit using results of the design explorations.