1301 results about "Parameter design" patented technology

A method for scheduling packet data transmissions in a wireless communication system is described wherein a priority function is based on a channel state indicator (CSI), the projected average throughput of the users, and a tuning parameter designed to control the throughput and fairness characteristics of the scheduling algorithm. The method also considers fairness criteria dictated by predetermined Quality of Service (QoS) requirements. The channel state indicator may be a Requested Data Rate (RDR) or Carrier-to-Interference ratio (C/I) information. The base station calculates a priority function for the multiple mobile users. Each priority function is a function of the CSI, the projected average throughput of a given mobile user, the average projected throughput over a set of users, and the tuning parameter.

The invention relates to a space borne TDICCD camera integral timing and adjusting method, which comprises the following steps: (1) the orbit is simulated with high precision in which positions parameters of photographed spots of the satellite under drift angle control or at different swinging angles are outputted such as vector coordinates and oblique distances of the photographed spots as well as vector simulation data for the satellite position; (2) the vector simulation data for the satellite position are analyzed to come out with the shift speeds of the photographed spots; (3) eliminate the radial-directional speeds from the shift speeds of the photographed spots to become the image motion speeds; (4) utilize the image motion speeds and the oblique distances of the photographed spots to obtain the integral times. The invention also provides a design method for TDICCD related parameters as well as a real-time adjusting method for integral times on the satellite under control of ground commands. The space borne TDICCD camera integral timing and adjusting method realizes an organic combination of simulation modeling with high precision and positional vector differential method, which eliminates errors introduced into the deduction process in traditional geometric analysis and calculation and controls error delivery to improve calculation precision; the arrival real-time adjusting method for integral times on the satellite ensures a reliable integral synchronous control.

The invention belongs to the field of continuous casting production, and particularly relates to a method for continuous casting billet two-stage continuous and dynamic heavy downward pressing. The method for the c two-stage continuous and dynamic heavy downward pressing is provided for the characteristics of a bloom caster and a wide and thick plate continuous casting machine. A specific process parameter design method of heavy downward pressing process implementation is given and includes downward pressing interval section and division and downward pressing amount design. The casting billet segregation defect is overcome in the first stage of downward pressing, the looseness defect of casting billets is overcome in the second stage of continuous downward pressing, and therefore the synchronous improvement of casting billet segregation and looseness is achieved.

A system and method for generating inline subcircuits that enable a circuit designer to model and simulate circuits that when compared to conventional system and methods reduces the hierarchy from the perspective of the circuit designer, more efficiently models parasitic components, more efficiently parameterizes device models, more effectively creates models that are compatible with other simulation tools, can change the interface of a component without requiring the designer to use an extra layer of hierarchy, provides a more efficient interface by hiding details from the designer, enables hidden monitors and other functional designs to be automatically simulated by hiding these functions from the designer in a design level that is below the design level that is of interest to the designer, such as the geometrical parameter design level, can perform general purpose model binning with automatic selection, can export models and model parameters to other hierarchies without requiring an additional hierarchy in the model name, can allow sharing of exported parameterized models by devices or components that are not within the inline subcircuit definition and can modify or create outputs for models by redefining or hiding existing outputs or creating new outputs.

In one embodiment, the invention provides for discovery of the functional aspects of a piece of software code. The invention then generates a set of testing parameters designed to test the piece of software code for proper operation of each of the discovered functions. The discovered functions and their corresponding testing parameters may then be stored as one or more test cases. Test code is then generated for each test case. The test code enables each test case to be run to determine whether the corresponding functions operate properly.

The invention discloses a five-axis side milling machining process parameter design method, belongs to the technology of numerical control (NC) machining, and solves the problem that real machining conditions cannot be reflected in cutting force calculation in the conventional process parameter design method. The method comprises the following steps of: tool path planning, cutting force calculation and process parameter optimization; in the tool path planning step, an NC code is generated by using computer-aided manufacturing (CAM) software; in the cutting force calculation step, first, a continuous tool path is generated from the NC code; then, a cutting thickness is obtained; and finally, the cutting force is calculated according to the cutting thickness; and in the process parameter optimization step, whether the calculated cutting force is not greater than a design threshold is judged; if the calculated cutting force is not greater than the design threshold, the NC code, the cutting depth and a feed rate are taken as input parameters; and otherwise, an NC code is regenerated. In the method, the real machining conditions are reflected by utilizing a tool enveloping surface analytical expression and the obtained transient cutting thickness is more accurate, so that the accuracy of the calculation of the cutting thickness and the cutting force is improved, and reliable assurance is provided for precisely and efficiently machining a spatial curved surface.

The invention belongs to the field of wind generator power conversion device control, and relates to a constant-frequency direct power control method for a PWM converter under the condition of power grid voltage imbalance. The method comprises the following steps of: determining a sampling frequency; acquiring a three-phase power grid voltage, a three-phase power grid current and a direct-current side voltage, and calculating resultant vectors E and I of the power grid voltage and the power grid current in a three-phase static coordinate system respectively; calculating positive and negative sequence components of the power grid voltage and the power grid current; calculating an instantaneous power and an instantaneous power error; calculating a converter reference voltage, and performing inverse transformation on the converter reference voltage; performing amplitude limit on the converter reference voltage to obtain the resultant vector of the converter reference voltage after the amplitude limit; and modulating the resultant vector of the converter reference voltage after a space vector modulation algorithm is adopted for amplitude limit, and outputting the converter voltage. The method can inhibit the active power fluctuation of the system more effectively and greatly reduce the harmonic wave of the alternating-current side current; and the output converter voltage switch frequency is constant, so the output filter parameter design is simpler.

The invention discloses a method for designing and optimizing cast-rolling process parameters of copper alloy tubing, using database as design basic, using nerve network as design method of process parameters and indexes, and using genetic algorithm as process parameter optimizing means, integrating nerve network, genetic algorithm, finite element simulation, experiment design, CAD parameterized design and database technique into the process design and parameter optimization, designing and optimizing the cast-rolling process parameters of the copper alloy tubing. And the invention has high automation degree, and can be applied to machining deformation of copper alloy tubing, and make personnel short of special knowledge able to make accurate and standard machining process.

The invention relates to an assembly type beam-column node connection device with a function recovery effect, and belongs to the field of structure engineering. The assembly type beam-column node connection device with the function recovery effect consists of a round steel pipe column with a cantilever beam section, a general beam section and a connection device for the round steel pipe column and the general beam section. According to the node connection device, welded parts are all finished in a factory, so that the weld seam quality and the machining precision can be more easily controlled; the round steel pipe column with the cantilever beam section and the general beam section are assembled by adopting a high-strength bolt and a connection plate on site, so that the construction speed is greatly increased and the construction quality is greatly improved; meanwhile, the general beam section can be arranged on the connection plate at the lower part of the cantilever beam section, so that the difficulty in construction is lowered and the field assembly and positioning are easy; a node is used for both beam end reinforcement and cover plate connection weakening; through reasonable parameter design, double energy consumption of frictional sliding of the bolt and plastic deformation of the connection plate and the bolt can be realized and a plastic hinge can be transferred to the connection plate; and the function of the structure can be recovered only by replacing the connection plate after earthquake.

A system and method for knowledge based development of interior models for configurable spaces, including storing a digital definition of the interior section of the passenger vehicle and parameters related to the objects, storing a digital definition of a plurality of three dimensional stay-out spaces associated with one or more of the objects, defining one or more collision rules between a first three dimensional stay-out space and a second three dimensional stay-out space, the rules define whether the first three dimensional stay-out space and the second three dimensional stay-out space may overlap, and designing the interior section to accommodate objects based on the defined collision rules and object parameters.

Cooperative sensing scheduling and parameter designs are described, which can achieve improvements in energy efficiency in cognitive radio networks, for example. In addition, the disclosed subject matter describes an objective or reward function or policy related to energy efficiency and considerations such as channel assignments sensing time that can maximize the objective function. The disclosed details enable various refinements and modifications according to system design and tradeoff considerations.

The invention provides a dynamics performance parameter optimizing method of a high-speed train, relates to the field of parameter design optimizing based on the dynamics simulation analysis of the high-speed train, and aims at effectively replacing a dynamics simulation model of the high-speed train by a comprehensive target neural network agent model and combining the design analysis and the multi-target optimization algorithm of the high-speed train in the multi-disciplinary field to analyze and optimize the dynamics simulation approximation model of the high-speed train. The method specifically comprises the steps of building a multi-rigidity dynamics simulation model for the high-speed train; determining related important input/ output design spaces; selecting sampling strategy to obtain a design space sample set suitable for the dynamics performance analysis of the high-speed train; improving the generalization accuracy of the comprehensive target neural network by the bayesian regularization method; adjusting the number of nodes in a hidden layer to build the comprehensive target neural network agent network model of which the error is controlled to be within a certain of range; performing multi-target optimization through the intelligent differential evolution algorithm by using the improved comprehensive target neural network agent network model to obtain the optimized high-speed train design parameters. The method is mainly applied to the dynamics analysis and design optimization of the high-speed train.

The embodiment of the invention discloses a true three-dimensional road intelligent design method and a true three-dimensional road intelligent design system. The method comprises the following steps of: performing road route selection and horizontal, longitudinal and transverse parameter design of the road in a high-precision three-dimensional terrain scene; adjusting the horizontal, longitudinal and transverse design parameters in the three-dimensional terrain scene; calculating a spatial position relationship between a road model and the three-dimensional terrain scene according to the design parameters, and generating a real three-dimensional road model, wherein the real three-dimensional road model comprises three-dimensional coordinate information which describes the road surface, and road surface texture information; and modifying the terrain of a region where the road is positioned according to the spatial position relationship between the real three-dimensional road model and the three-dimensional terrain scene, and establishing a road model which is seamlessly jointed with real earth surface. By performing road route selection in the high-precision three-dimensional terrain scene and designing and adjusting the horizontal, longitudinal and transverse parameters, the method and the system realize three-dimensional terrain scene-based road design and visualization.

The invention relates to a Revit platform based continuous-girder-bridge parametric modeling method. The method includes: 1), leading in numerical values of coordinate points of box-girder sections ofa continuous girder bridge to generate a box-girder contour model; 2), adding datum lines, size markers and parameter constraints of the box-girder sections and establishing parametric three-dimensional box-girder component models; 3), according to instance data of a box girder, generating box-girder instance models of the entire bridge according to the parametric three-dimensional box-girder component models established in the step 2), and modifying names of the instance models of box-girder components according to actual needs; 4), establishing rebar models of the box-girder components; 5),establishing component models of bridge piers, bearing platforms and pile foundations. Automatic generation of statistic of work amount and drawings is achieved, and a good data platform foundation is provided for operation and maintenance of later bridge BIM (building information modeling); problems that two-dimensional drawings are repeated in data input, non-universal in data, dispersing in spatial relation, non-parametric, informative linkage forbidden in parameter design and the like are solved.

The invention relates to an ultrahigh-resolution agile SAR satellite sliding spotlight mode system parameter design method, is applicable to flexible realization of the ultrahigh-resolution imaging SAR satellite sliding spotlight mode system parameter design through whole satellite attitude, and belongs to the technical field of overall design of SAR satellites. According to the method, an accurate orbit, an earth model, system restriction factors, and imaging work characteristics of the sliding spotlight mode are fully considered, an ultrahigh-resolution agile SAR satellite sliding spotlight mode system parameter design method is provided, and an economic and high-efficiency realization method is provided for the ultrahigh-resolution satellite-borne SAR imaging; and the criterion of uniform-beam footprint ground slide speed is employed, ground aiming points of all moments within the whole imaging time are designed, parameters such as the attitude requirement and PRF at an instantaneous moment are calculated, and compared with the conventional method for calculating the parameters according to the mode far away from ground virtual aiming points, the method is higher in precision and imaging efficiency.

The invention discloses an AC-DC hybrid micro grid bidirectional power converter virtual synchronization motor control method, and relates to the AC-DC hybrid micro grid virtual synchronization motorcontrol field; the bidirectional power converter is a three-phase voltage source type PWM converter formed by IGBT switch tubes; the AC side is connected to a AC bus via a LC filter and a line impedance Z ac; the DC side is connected to a DC bus via a DC capacitor Cdc and an line impedance Zdc; the energy bidirectional transmission can be realized respectively via a frequency control unit, a virtual excitation control unit and a bidirectional power transmission control unit; the AC frequency and DC voltage can be directly controlled so as to keep AC-DC subnet load balancing; throughput characteristics of various types of power supplies and loads of the AC-DC subnet can be fully utilized so as to provide inertia for the AC frequency and DC voltage, thus enabling the bidirectional power converter to present sagging characteristics under a stable state, and building a bidirectional power converter closed loop system small signal model so as to provide a key parameter design method.

A tunnel shield universal segment dynamic 3D virtual assembling system applied in the tunnel technology field comprising a geometry modeling module for setting up the geometry model of the segments and the tunnel axis by parameter design and storing the model into a database, a universal segment selection module for obtaining the geometry model data from the database and processing them to obtain the segment point sequence of the tunnel axis and storing them into an assembling database, a core module namely the universal segment 3D virtual assembling and deviation detection module for extracting the virtual assembly required data from the assembling database interface, displaying the assembling process on the terminal and displaying the deviation between the virtual assembled segment center with the tunnel theoretical axis in the text and graph mode, a universal segment assembling data processing module for executing the data maintenance and communication with the database. The invention realizes the dynamic function of the universal segment in the tunnel shield construction to facilitate the on-time regulation of the tunnel machine posture.

A method of digitally correcting the raw output voltage from a Capacitive Voltage Transformer (CVT) with the intent to remove transient components impacting on transient accuracy of protection function. A typical CVT is represented using three parameters in the linear CVT model. A digital filter designed based on the three parameters and incorporating a dedicated mechanism to ensure numerical stability of the former. A method of self-adjusting the said filter based on system events and performed after the method has been deployed in the field and supplied from a specific CVT.

The invention discloses an unmanned aerial vehicle auxiliary wireless sensor network and node scheduling and flight parameter design method thereof, and belongs to the wireless technical field of thewireless communication and internet of things. The unmanned aerial vehicle auxiliary wireless sensor network comprises an unmanned aerial vehicle air base station and K single-antenna ground terminalnodes; the unmanned aerial vehicle air base station performs movement according to an optimized path, speed and acceleration and like flight parameters at the specified flight time; at each flight moment, the unmanned aerial vehicle base station sends data to a scheduled ground terminal node, and only communicates with one terminal node at each moment. Through the method disclosed by the invention, the system energy efficiency maximization is used as the target, and a terminal node scheduling policy and unmanned aerial vehicle flight path, the flight speed and the acceleration are used as theoptimization variable, so that a mathematical model is established in consideration of the unmanned aerial vehicle maximum flight speed, the maximum acceleration and the uniform acceleration, the terminal node data transmission rate fairness and like conditions, thereby solving to obtain a suboptimal terminal node scheduling and unmanned aerial vehicle parameter solution.

The invention relates to the technical field of optical lenses, particularly to an achromatic metalens design method and an achromatic metalens thereof. The achromatic metalens design method comprisesperforming analog scanning on every degree of freedom geometrical parameter of every single nano unit through a numerical simulation method, performing numerical adding on phase shift produced by nano units with different geometrical parameter combinations, performing numerical multiplication on transmittance to acquire the total phase shift and the total transmittance of superposed multilayer nano units, performing superposition combination on the nano units with appropriate units, and arranging the superposed nano units according to the corresponding Fresnel hyperbolic-type laws corresponding to every target wavelength to obtain the achromatic metalens. By performing parameter design, superposition combination and arrangement on the nano units forming the achromatic metalens, the achromatic metalens can act on multiple target wavelengths and eliminate the influence of color difference brought about by traditional lenses, and the area of the achromatic metalens can be increase to thecentimeter scale or above.

The invention discloses an incremental model-based spacecraft telemetering method. The method comprises the steps of (1) building a spacecraft incremental telemetering design model which includes a data system model, a detail design model and a system integration model; (2) finishing related parameter design of the data system model, the detail design model and the system integration model in sequence; (3) converting the data system model, the detail design model and the system integration model after parameter design into configuration codes compilable for a computer; (4) finishing configuration code combination and providing the configuration codes for satellite-borne telemetering software components; and (5) reading the corresponding configuration codes by satellite-borne software, and finishing spacecraft telemetering data acquisition, storage, retrieval, packing, scheduling, framing, virtual channel scheduling and telemetering transmission frame generation and transmission. The method can ensure design information of a spacecraft telemetering system not to be repeated and omitted, thereby remarkably improving the design efficiency of the spacecraft telemetering system.

This invention discloses one involute gear three-dimensional resonance drive device, which adopts design and process technique as flexible wheel and rigid wheel outline and is characterized by the following: at flexible wheel length taking gear vertical to flexible whell axis section; according to each section different radium deformation parameters designs the outline between flexible and rigid wheels to get the involute outline with variable parameters.

The invention relates to a design method for end part- and root-reinforced few-leaf variable-section steel plate springs, and belongs to the technical field of suspension steel plate springs. The design method disclosed by the invention comprises the following steps: determining the toot thickness he of an equivalent single leaf according to the structure of each steel plate spring, a design rigidity, the thickness ratio of oblique line segments on the root and the end parts, and the thickness ratio of primarily-selected parabolic segments, and determining the maximum allowable thickness [h2] of the root according to an allowable pressure at first; then designing the number N and the root thickness h2 of the few-leaf variable-section steel plate springs according to he and [h2]; and then designing the thicknesses and the lengths of straight segments on the end parts of each leaf separately according to the end part thickness beta he of the equivalent single leaf. Through ANSYS simulation and verification, the accurate parameter design values of the end part- and root-reinforced few-leaf variable-section steel plate springs can be obtained by virtue of the method, the design level and the performance of products are improved, the weights of the springs are reduced, and the running smoothness of vehicles are improved; and meanwhile, the design and test expenses are reduced, and the development speed of the products is increased.

The invention discloses a surrounding rock plastic zone size-based quantitative roadway support design method. The method comprises the following steps of: 1, carrying out calculation to determine a size of a radius R of a roadway surrounding rock plastic zone; 2, classifying roadway surrounding rocks according to the calculation result; 3, carrying out targeted support parameter design on different types of surrounding rocks according to the roadway surrounding rock classification result; and 4, modifying and adjusting support parameters according to on-site monitoring feedback information. According to the method, support parameters designed on the basis of plastic zone sizes are scientific and reasonable, and roadway surrounding rock classification is carried out by taking plastic zoneradius sizes as main indexes, so that targeted support parameter design is carried out on different types of surrounding rocks so as to ensure the scientificity and economy of roadway support design.For roadway support, the method is capable of playing a part of preventing roadways from roof fall accidents.

A high frequency module substrate device used in a high frequency module apparatus, which is adapted for switching pass-frequency characteristic of band-pass filter by switching and is adapted so that optimum band-pass filter characteristic is obtained in all pass-frequency bands, wherein a thin film capacitor element (18) is constituted between a base substrate (2) in which the uppermost layer is flattened with organic substrate being as core substrates (5), (6) to constitute a buildup formation surface (16) and a high frequency circuit unit (3) of lumped parameter design formed on the buildup formation surface in a laminated manner to carry out switching of load of parallel capacity with respect to a coupler (11) having frequency characteristic of λ/4 which has been caused to undergo distributed parameter design at the base substrate portion side of the thin film capacitor through switch means (4).

The invention provides a parameter design method for a high-voltage high-capacity VSC (voltage source converter). The VSC is connected with an electric grid through an LCL (lower control limit) filter, the LCL filter comprises an electric grid side electric reactor, a valve side reactor and a filter capacitor, and the filter capacitor is connected in parallel between the valve side reactor and the electric grid side electric reactor. The problems for filtering out harmonic waves filled into the electric grid by the VSC and inhibiting the converter main loop resonance led in by the LCL filter are solved through setting the parameters of the LCL filter and a controller of the VSC. Compared with the simple experience algorithm and the complicated calculating method of the existing LCL filter, the method has the advantages that the parameter of the filter is designed according to the operation characteristics of the VSC and the frequency-domain characteristics of the LCL filter, simplicity is realized, the implementation is easy, the engineering construction can be realized, the theoretical basis is full, the harmonic pollution to the electric grid is low, and the grid-connected electric energy quality requirement of the national standard on the VSC can be met.