11 results about "Line source" patented technology

The invention discloses a three-dimensional transient electromagnetic detection method for tunnel advanced geological forecast. The transient electromagnetic exploration method has the advantages of low construction cost, high safety coefficient, reliable detection result and the like. The method comprises the following steps: installing a plurality of loop sources in an area nearby a tunnel face in a set mode, and obtaining stratum information data of the area nearby the tunnel face; and analyzing the data by adopting a three-dimensional transient electromagnetic forward and reverse modeling method to obtain related information of the unfavorable geologic body in front of the tunnel face. According to the method, the efficiency and the accuracy of transient electromagnetic tunnel advanced prediction are improved.

The invention discloses an interference correction method and system for a large-angle-of-attack device half-column far-field support, and relates to the field of wind tunnel data processing, and the method comprises the steps: employing an X axis to represent an airflow direction, employing a Y axis to represent an upward direction, employing a Z axis to accord with a right hand system, taking a half column as a finite-length vertical line source passing through the rotation center of an angle-of-attack head, establishing a mathematical model of a finite-length vertical linear source pair model area in an integral form according to an induced velocity basic formula of the linear source micro-segment pair model area; configuring semi-column characteristic parameters, position parameters and model geometric parameters of the mathematical model; calculating the actual wind speed and the airflow deflection angle after the model point is disturbed by the finite-length vertical line source according to the semi-upright characteristic parameters, the position parameters and the model geometric parameters; aerodynamic characteristics are corrected according to the actual wind speed and the airflow deflection angle. By combining the device and the model characteristic parameters, the interference of the semi-stand column can be corrected in real time in the test process, the accuracy of test data is further improved, and the engineering practicability is met.

The application discloses a crimped cylindrical wave tight field device, which mainly comprises a crimped parabolic cylindrical reflector, a feed source, a quiet zone and a virtual line source. The parabolic cylindrical reflector can correct the cylindrical wave formed by the spherical wave emitted by the feed source in the quiet zone. In order to control the diffraction of the edge of the reflector, the edge of the parabolic cylindrical reflector needs to be processed. The crimped edge of the parabolic cylindrical reflector can reduce the low-frequency limit of the cylindrical wave tight field. Compared with the sawtooth cylindrical wave tight field, the electric size of the reflector working at the low-frequency limit is smaller, and the engineering realization of the large cylindrical wave tight field is more favorable.

The invention discloses a buried pipe group heat transfer simulation method considering hydraulic-geological boundary geometric mismatch, and belongs to the technical field of geotechnical engineering and underground energy storage. The method comprises the following steps: identifying a spatial relationship between an underground water level interface and a geological layering interface based on a geometric algorithm, executing in-layer sub-layer discretization processing, and generating a calculation sub-layer sequence with a hydraulic attribute mark; whether geometric mismatch exists or not is judged by comparing the depth of the top and bottom plates of each geological layer with the buried depth of the underground water level; constructing a composite analytic calculation model, and performing full space-time coupling solution on the transient thermal network in the borehole and the external heterogeneous moving finite line source field; and outputting a long-term thermal response prediction result, and performing optimization evaluation on the buried pipe system layout based on prediction data. According to the method, the complex boundary condition that the underground water level line does not coincide with the geological stratified interface is accurately described, and full coupling calculation of transient heat transfer in the pipe and stratified non-uniform convection-diffusion heat transfer outside the pipe is achieved.

The invention relates to a sound propagation modeling and calculating method based on a vertical columnar line source analytical solution, a medium and equipment, and belongs to the field of ocean sound field modelling, the method comprises the following steps: based on a cylindrical wave theory and a boundary condition, establishing an analytical relationship between a columnar sound source surface vibration parameter and a radiation sound pressure field in a surrounding medium; enabling the vertical columnar line source to be equivalent to a set of a plurality of point sound sources distributed along the axis of the vertical columnar line source, and calculating a sound field excited and superposed by the point source set in the horizontal layered ocean waveguide based on a normal wave theory; and calculating a sound source level based on the reference sound pressure determined by the columnar noise source model, combining the sound source level with the far-field sound pressure distribution calculated by the sound propagation model, and calculating to obtain a radiation noise level from a sound source to a far-field receiving point. According to the method, the vertical columnar analytic solution and the underwater normal wave acoustic propagation method are coupled, acoustic propagation modeling and simulation calculation of the marine vertical columnar line source under water are achieved, and the calculation precision is improved.

The invention discloses an interference correction method and system for a beam far-field support of a bracing wire tail boom mechanism, and relates to the field of wind tunnel data processing, and the method comprises the steps: enabling an X axis to represent an airflow direction, enabling a Y axis to represent an upward direction, enabling a Z axis to accord with a right hand system, taking a beam as a finite-length horizontal straight line source around a rotation center of the bracing wire tail boom mechanism, establishing a mathematical model of a finite-length horizontal linear source to the model area in an integral form by using a basic formula of induced velocity of the horizontal linear source micro-segment to the model area; configuring characteristic parameters, position parameters and model geometric parameters of the bracing wire tail boom mechanism of the mathematical model; according to the characteristic parameters, the position parameters and the geometric parameters of the model of the bracing wire tail boom mechanism, calculating the actual wind speed and the actual airflow deflection angle after the model point is disturbed by the finite-length horizontal linear source; and performing aerodynamic characteristic correction according to the actual wind speed and the actual airflow deflection angle. By combining the device and the model characteristic parameters, the interference of the far-field bracket of the cross beam can be corrected in real time in the test process.

The application discloses a kind of based on metasurface beamforming array antenna, the antenna array surface includes multiple column line sources, each column line source includes a power division feed network and multiple antenna radiation units, the antenna radiation unit is connected with the power division feed network by metallization feed hole, and the power division feed network is fed to the antenna radiation unit by the metallization feed hole;The metasurface is loaded on the antenna array surface, and the amplitude and phase of the electromagnetic wave radiated by the antenna array surface are regulated and controlled.By the above-mentioned optimization design of metasurface beamforming array antenna, phase scanning and metasurface beamforming are combined, one-dimensional array shaping and one-dimensional phase scanning are realized, beamforming and beam rapid scanning are realized, and the integration design of antenna array surface, power division feed network and metasurface loading is low in cost, and the profile height of the whole array surface is greatly reduced.

The invention discloses a multi-scene diffusion calculation method for a chemical pollution source. The method comprises the following steps: (1) parameter input and verification: inputting pollution source parameters, meteorological parameters, calculation region parameters and pollutant types; performing numerical range, data type and logic consistency verification on the input parameters, filling default values when non-key parameters are missing, and prompting correction when the parameters are abnormal; (2) coordinate conversion and caching; (3) calculating diffusion parameters; (4) single-source concentration calculation; (5) multi-source concentration superposition; and (6) result output: outputting a calculation result in the forms of a data table, a scatter diagram and a JSON file. According to the method, multi-scene unified calculation can be provided, an instantaneous point source, a continuous point source, an instantaneous multi-point source and a moving line source are supported, dynamic weather, terrain and pollutant characteristic correction are introduced to improve precision, calculation logic is optimized, and emergency efficiency is ensured.

The present application relates to a kind of post-casing reservoir radial long-distance high-precision detection method and system, comprising: the joint detection mechanism of electromagnetic induction method and line source method is analyzed, and the layered columnar model of post-casing reservoir joint detection of electromagnetic induction and line source combination is established;Based on the layered columnar model of post-casing reservoir joint detection, the excitation of electromagnetic probe and line source is designed, and the radial long-distance detection result of post-casing reservoir under different detection depths is obtained;The radial long-distance detection result of post-casing reservoir obtained under different detection depths is imaged, and the injection breakthrough front and oil-water interface distribution are obtained.The present application explains the reservoir resistivity by the way of electromagnetic induction and line source combination, eliminates the limitations in the reservoir detection in the prior art, improves the reliability of reservoir detection system inversion interpretation, provides a new idea for downhole casing post-casing reservoir medium online identification and oil-water interface distinction.Therefore, it can be widely applied in oil reservoir detection technical field.

The application discloses a VICTS array antenna with a scanning starting beam pointing to zero, which comprises a feeding network and a radiation network. 10 The feeding network comprises a power division network, a slow wave structure, a parallel plate waveguide and a line source generator. 10 The power division network divides TE 10 waves into n TE waves and outputs the n TE waves to the line source generator. The line source generator synthesizes and converts the n TE waves into quasi-TEM waves and outputs the quasi-TEM waves to the parallel plate waveguide. The parallel plate waveguide transmits the quasi-TEM waves to the radiation network. The radiation network radiates the quasi-TEM waves to free space. The slow wave structure and the parallel plate waveguide are coupled to change the equivalent guided wave wavelength of the parallel plate waveguide. The slow wave structure comprises a rotating disc and a plurality of pins. The rotating disc is provided with a downwardly recessed curved surface on the top. The plurality of pins are arranged on the curved surface to form a pin array. The row spacing of the pin array is greater than the column spacing. The VICTS array antenna can realize scanning starting beam pointing to zero in the whole frequency band of 14-14.5 GHz satellite communication frequency band, has no scanning blind area and can meet the demand of large scanning range in current satellite communication.

The invention discloses a vertical finite long line source electromagnetic exploration apparent resistivity imaging method, which comprises the following steps: (1) based on a uniform half-space model, deducing a radial electric field response analytic expression of vertical finite long line source well-to-ground electromagnetism on the ground; (2) setting a geoelectric model; (3) calculating parameter input; (4) performing initialization setting; (5) carrying out resistivity iterative calculation; and (6) judging whether abnormal bodies exist or not and identifying abnormal body distribution. According to the method, the monotonous relation between the electric field and the resistivity is introduced, the numerical solution path more suitable for the electromagnetic response law is adopted, and the purposes of shortening the apparent resistivity calculation time and achieving rapid imaging can be achieved.