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329 results about "Design phase" patented technology

Vector averaging calibration method for phased-array antenna

InactiveCN102412441AHigh precisionReducing the Effect of Phase Shift Errors in CalibrationAntenna arraysPhase shiftedDesign phase
The invention provides a vector averaging calibration method for a phased-array antenna, and aims to provide a vector averaging calibration method capable of improving calibration accuracy and avoiding the influence of phase-shifting errors of branch phase shifters. The method comprises the following steps of: (1) serially/parallelly connecting the phase-array antenna with N units and N transmitter-receiver (TR) components comprising N phase shifters to obtain a calibration feed network, and connecting each phase-array antenna feed branch to a calibration amplitude phase receiver through a beam-forming network and the calibration feed network to obtain a transmitter-receiver circuit; (2) setting a phase-array antenna feed branch consisting of the beam-forming network and the TR components comprising the phase shifters as an object to be calibrated, and performing phase shift on the phase shifters by using a wave shaper; and (3) obtaining the initial phase and amplitude distribution of each branch by using a vector averaging algorithm, wherein the difference between the phase and the amplitude distribution and the designed phase and amplitude distribution is a calibration parameter. The calibration method has the advantages of high accuracy and engineering applicability.
Owner:10TH RES INST OF CETC

Antenna phase center measuring method based on moving reference point

InactiveCN101320062AImprove test accuracyOvercoming the problem of poor measurement accuracyAntenna radiation diagramsAutomatic controlDesign phase
The invention discloses a method for measuring the phase center of an antenna, which is based on moving reference points. The method provided by the invention mainly solves the measuring problems of manual operation and artificial judgment. The method includes the following steps: in the measuring system, a measured antenna is adjusted to face an original antenna and is taken as the zero point of a measuring angle; the horizontal direction and the vertical direction of a two-dimensional translation device are controlled to reset and taken as the datum reference point of the phase center test; related parameter information is input and all moving shafts are controlled automatically, thereby collecting the amplitude and phase data of the measured antenna; the horizontal deviation and the longitudinal deviation of the phase center can be worked out by using the least square method and then can be determined whether the deviation of the phase center meets the deviation requirements of the designed phase center of the antenna; if not, the reference point of the antenna can be changed by automatically adjusting the horizontal coordinate and the vertical coordinate of the two-dimensional translation device according to the deviation value; the test can be repeated again and again until the horizontal deviation and the longitudinal deviation meet the requirements; and the final changed reference point can be taken as the phase center of the measured antenna. The method provided by the invention can automatically and accurately measure the phase center of an antenna.
Owner:XIDIAN UNIV

Structural finite-element parametric modeling method applicable to grating-configuration rudder surface

The invention discloses a structural finite-element parametric modeling method applicable to a grating-configuration rudder surface. According to the method, a mapping transformation method based on a finite element model and a parametric approach to achieving conversion from two-dimensional mesh parameterization division to three-dimensional appearance expansion are adopted. The method includes the steps of specifically conducting two-dimensional plane projection on the grating-configuration rudder surface, extracting characteristic parameters, and conducting two-dimensional parameterization division; building a mapping relation between a two-dimensional finite element mesh and a three-dimensional finite element mesh, designing a numbering rule for finite element mesh points, and achieving conversion from the two-dimensional mesh to the three-dimensional appearance expansion; by means of a high-level computer language program, implementing the structural finite-element parametric modeling procedures for the grating-configuration rudder surface. By using the method, in a conceptual design phase or a preliminary design phase, the structural modeling efficiency can be greatly increased, the costs of time and manpower are low, parameters of self-compiled programs can be adjusted quickly, analysis applicability is high, the obtained model is applicable to analytical calculation of structural vibration, structural dynamics and the like, and the method is applicable to grating-configuration rudder surfaces and grating-configuration airfoils.
Owner:BEIHANG UNIV

A method for analyzing fatigue life of steering knuckle

The invention discloses a method for analyzing the fatigue life of a steering knuckle, comprising the following steps: 1) obtaining the fatigue load of the steering knuckle; 2) carrying out uniaxial tensile material test on the use material; 3) if the fatigue load is under the static load condition, the elastic-plastic finite element analysis method is adopted to solve the problem; or, if it is the actual pavement load spectrum, the elastic-plastic finite element analysis is carried out on the points exceeding the yield strength by elastic finite element method and linear superposition method,and the modified stress-strain results are obtained. 4) analyzing the biaxiality of the obtained stress response in time domain to determine the load state of the steering knuckle; 5) calculating thedamage accumulation and life of steering knuckle. The present invention solves the problem of time-consuming finite element solution under the input of actual pavement load spectrum, at the same time, the stress and strain of the material entering the plastic phase are considered, so that the result is more accurate, and fatigue analysis is carried out by combining the static load condition or the single channel static load condition, and more references are provided in the design phase.
Owner:SOUTH CHINA UNIV OF TECH

Multi-sense unequal-radius wireless sensor network route implementing method

The invention discloses a multi-sense unequal-radius wireless sensor network route implementing method includes a design phase and an implementation phase. The design phase includes a zoning phase, a cluster head selecting and cluster forming phase, a multi-hop route setting phase and a stable communication phase. The multi-sense unequal-radius wireless sensor network route implementing method has beneficial effects of reducing node communication cost effectively and balancing network energy consumption. Energy consumption of different nodes is balanced and energy conservation during a working process is achieved, which are attributed to a though of double cluster head and non-balancing clustering. The clustering radiuses are comparatively large and the scales of clusters are comparatively large in zones away from Sink nodes. Two cluster heads can be used for sharing energy consumption of data collection and communication. The clustering radiuses are comparatively small in zones adjacent to the Sink nodes and clusters in the zones adjacent to the Sink nodesare more than those in the zones away from the Sink nodes. Therefore, transceiving energy consumption due to inter-cluster multi-hop can be shared by the clusters of a large number and energy consumption in the network can be balanced well. By using the method provided by the invention, network energy consumption can be balanced well and network service lifetime of the network can be prolonged.
Owner:黄伟
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