30results about How to "Strong theoretical basis" patented technology

The invention relates to a reactivity measurement method with the background current and source item current correcting function. According to the method, calculation is performed through two-stage fitting; actually-measured current of the reactivity constant segment serves as input of the first-stage fitting, real reactivity without being affected by a background and a source item is obtained through direct calculation, and then control rod integral value is obtained; background current and neutron source intensity can be separated out through the second-stage fitting. According to the method, a theoretical basis is high, consideration is more comprehensive, and the result credibility is higher. Besides, under some conditions and requirements, the control rod integral value can be measured by replacing a traditional dynamic rod engraving method with the method. The control rod value measured through the method is more accurate and higher in credibility, remarkable economic benefits will be brought to a power plant, and the safety level is improved.

The invention discloses a stress state-controllable instrument for testing the content of unfrozen water in frozen soil. The instrument comprises an organic glass top cover with an embedded nondestructive TDR probe, the organic glass top cover is arranged in a pressure chamber filled with an antifreeze liquid and is located above a soil sample, the organic glass top cover is connected with a vertical stress loading frame outside the pressure chamber through a loading rod in order to apply a vertical load, the soil sample is connected with a freeze-thaw temperature control system for heat exchange, the antifreeze liquid in the pressure chamber is connected with a hydraulic system in order to apply a confining pressure load, the nondestructive TDR probe is connected with a signal transmitterthrough a coaxial cable, and the dielectric constant of a medium is obtained by a pulse reflection signal in order to determine the content of unfrozen water. The TDR nondestructive probe and the freeze-thaw temperature control system are arranged in a loading system, so the instrument has the advantages of accuracy in stress state control, normality in working, and accuracy in testing the content of the unfrozen water in the frozen soil in different stress states.

The invention discloses an image false matching detection method based on an augmented homogeneous coordinate matrix. Based on correct matching in one iteration, the augmented homogeneous coordinate (AHC) matrix is constructed, more accurate anchor matching is selected till an Euler's distance between an estimated matching coordinate and an actual matching coordinate corresponding to each pair ofmatching of anchor matching is not greater than the set threshold, and the AHC matrix is constructed based on a final anchor point matching set to complete global verification. The method is advantaged in that a problem of difficulty in false matching during projective image search in the prior art can be effectively solved, high-efficient processing can be carried out even when two correspondingpoint sets has projective transformation and has strong characteristic detection noise and high-proportion false matching, and properties of fast calculation speed, high precision, wide application scope, strong robustness and insensitiveness to large-scale image calculation are realized.

The invention discloses a systematic driving behavior recognition method based on the idea of ​​clustering. The driving behavior recognition method includes the following steps: establishing a statistical feature model; using an inertial sensor to collect driving behavior data; using a Kalman filter to Filtering the data; using an adaptive window function method to extract effective driving behavior data on the filtered data, and further extracting the statistical features of the effective data; screening to obtain the optimal statistical features; classifying the statistical features of the driving behavior data , to identify the corresponding driving behavior. Based on the idea of ​​clustering, the present invention provides a systematic driving behavior recognition method with very few features, very low calculation amount and high precision, which has broad application prospects in the fields of social security, auto insurance, fleet management and the like.

The present application discloses methods and methods for calculating fracture porosity in tight reservoirs using dual lateral curves. The method includes: determining a target reservoir as a fractured gas layer; calculating a dual lateral response correction parameter Δg for the fractured gas layer according to a calculation formula; correcting the deep lateral logging value of the fractured gas layer according to the correction formula, The corrected deep lateral logging value is obtained, and the corrected deep lateral logging value is used to calculate the porosity of the target reservoir. The technical solution proposed in this application proposes a method to eliminate the response of the dual lateral gas log by using the calibration study of the fracture and reservoir gas-bearing log curves for tight reservoirs, so as to achieve accurate calculation of tight reservoirs. The purpose of layer double lateral fracture porosity has strong theoretical basis and low implementation cost, which provides a reliable basis for tight reservoir evaluation and production test layer selection.

The invention relates to analysis methods of the power transmission and distribution system field of electric engineering, in particular to an energy efficiency analysis method suitable for direct-current power distribution network lines. The energy efficiency analysis method is suitable for a medium voltage distribution network and line analysis is dominant in energy efficiency analysis. According to the energy efficiency analysis method, on the portion of the lines, cable conductors serve as main research objects, the energy efficiency indexes of the alternating-current line, the monopole direct-current line and the bipolar direct-current line are analyzed and compared, and which line is higher in energy efficiency is judged. For the alternating-current line, the monopole direct-current line and the bipolar direct-current line, specific calculation models of the indexes including active power loss, power supply efficiency, electric energy loss and line loss per unit are provided. The energy efficiency analysis method can be widely applied to calculation and comparison of the power distribution networks with different voltage levels, results and conclusions obtained at different voltage levels can be different, and an energy efficiency analysis and comparison conclusion of the alternating-current scheme of the power distribution network and the direct-current scheme of the power distribution network can be made by the adoption of the energy efficiency analysis method.

The invention discloses a high-voltage and low-voltage power grid voltage dynamic response decoupling method, which includes collecting synchronous measurement data after a large disturbance; determining the grid structure of the interconnected power grid and the electromechanical transient state of transmission lines, transformers and loads before the large disturbance occurs The parameters of the model; list the electromechanical transient equations of the interconnected grid, and use Newton's method to solve the equations to obtain the voltage response of the low-voltage side to large disturbances at each moment; use the median filter and mean filter method to filter out the voltage measurement of the low-voltage side Impulse noise and Gaussian white noise in the data; subtract the large disturbance voltage response from the filtered low-voltage side voltage measurement data to obtain the voltage response component of the local disturbance on the low-voltage side, and complete decoupling. The invention decouples the voltage measurement data on the low-voltage side, and the decoupled data can be used for analysis and application scenarios at different levels of the high-voltage and low-voltage power grids, thereby improving the usability of the voltage measurement data on the low-voltage side and the controllability and reliability of the low-voltage power grid. observability.

The invention discloses a dynamic model design method based on a double mechanical arm cooperative grinding system. The dynamic model design method based on the double mechanical arm cooperative grinding system comprises the following steps that 1, a double mechanical arm Jacobian matrix based on a grinding machining track is constructed, physical parameters of a grinding tool and a clamped workpiece are combined based on the double mechanical arm Jacobian matrix in a kinematic level, and joints of double mechanical arms are combined with the grinding track to construct the Jacobian matrix from the grinding track speed to each mechanical arm joint speed; 2, grinding force simplified mechanical models of the grinding tool and the workpiece are constructed; and 3, a coupling kinetic model ofthe double mechanical arm cooperative grinding system is constructed, the cooperative grinding system is divided into a machining mechanical arm system and a clamping mechanical arm system, and a kinetic model of a coupled machining mechanical arm system and a coupling a kinetic model of a coupling clamping mechanical arm system are correspondingly constructed.