40results about How to "Optimize calculation method" patented technology

The invention relates to the technical field of operation and maintenance and monitoring on a substation DC system, specifically, relates to a method for determining battery performance by multi-parameter weighting, comprising the following steps of : 1 collecting the cell voltage of each cell in real time and recording it once every hour; 2 automatically performing an internal resistance test every month, and recording the internal resistance and discharge voltage of each battery in the internal resistance test. The method for determining battery performance by multi-parameter weighting assigns weights according to categories, and then calculates the integrated value of each battery. The battery with the highest combined value is the worst performing battery. The calculation method is simple and accurate.

The invention relates to an electric power system node impedance matrix Z solving method based on CU triangular decomposition and belongs to the field of electric power system analysis and computing. The method mainly includes the steps of forming a node admittance matrix Y; performing quick CU triangular decomposition on the matrix Y; solving a matrix Wk through CWk=Ek; solving non-diagonal elements of a diagonal element Zkk and the diagonal element above the diagonal element Zkk of a matrix Zk through UZk=Wk; solving non-diagonal elements on the left of the diagonal element Zkk in accordance with the symmetry; writing data of a matrix Z to a data file. According to the electric power system node impedance matrix Z solving method based on CU triangular decomposition, a CU triangular decomposition method higher in calculation efficiency than a LDU triangular decomposition method is used for solving elements of the matrix Z, the symmetrical relationship between elements of a matrix Y and elements of a matrix C and a matrix U is used for quickly forming a composite matrix of a factor matrix C and a factor matrix U, and the symmetry of the matrix Z and the calculation order of elements of the matrix Zk is used for omitting back substitution solving of lower triangular elements of the matrix Z for achieving direct solving, so that the speed of formation of the matrix Z is greatly improved. Compared with the traditional LDU triangular decomposition method, the electric power system node impedance matrix Z solving method based on CU triangular decomposition has the calculation speed increased by about 33% when the method is used for IEEE-30, IEEE-57 and IEEE-118 node system checking calculation.

The invention provides a method for determining bearing capacity characteristic values of tamped / compacted fill strata by using the shear wave velocity. The method for determining the bearing capacitycharacteristic values of the tamped / compacted fill strata specifically includes the steps that the fill strata of a dynamic compaction (compacted) foundation are classified by using first stone backfill materials with different particle sizes, then the bearing capacity characteristic values of the fill strata calculated by adopting shear strength indexes (c and phi) of a direct shear test on sitecorrespondingly correspond to the shear wave velocity in a borehole to establish the relationship between the bearing capacity characteristic values and the shear wave velocity, and through the established correspondence, the accurate and fast method for determining the bearing capacity characteristic values of tamped / compacted foundation soil layers is provided in addition to a load test method.An accurate basis for valuing of the bearing capacity characteristic values is provided for valuing and evaluation of a tamped foundation and a compacted foundation in geotechnical engineering investigation.

The embodiment of the present invention discloses a method and system for obtaining optimal vehicle efficiency, wherein the method includes: establishing a force model of the vehicle; sampling the speed of the vehicle to obtain feedback data, and obtaining driving resistance according to the force model of the vehicle Equivalent coefficients A, B, C; according to the equivalent coefficients A, B, C of driving resistance and the mass of the vehicle, determine the required torque of the vehicle; set the torque interval to filter the motor high-efficiency point to output the optimal torque to realize the vehicle optimal efficiency. This scheme establishes the mathematical model of the whole vehicle, and uses the equivalent force coefficient of the whole vehicle in the closed-loop adjustment to meet various working conditions in the operation of the whole vehicle. Optimize the calculation method, look up the table, difference, weight, advance calibration and other methods to improve the calculation efficiency.

The invention discloses a method for quantitative analysis of pore structure parameters of coal reservoirs based on SEM images. Perform binarization processing to obtain a binary image; establish a two-dimensional coordinate system about the binary image, identify the pixel values ​​corresponding to all pixel points in the binary image corresponding to each coal reservoir sample according to the matrix traversal method, and mutate the pixel values The pixel points are used as the pore edge and divide the pore space individuals in the binary image; determine the coordinate value of each pixel point in the two-dimensional coordinate system and calculate the pore radius of each pore space individual, and obtain each pore space in the binary image. Pore ​​coordination number of individual pore space; output histogram of pore radius distribution, pore coordination number histogram, average pore radius and average pore coordination number of each coal reservoir sample; The calculation accuracy is high and the implementation cost is low.

The present invention provides a computing method and device for platform-based log analysis, wherein the method includes: receiving a first condition group to form a first calculation rule; receiving a second condition group to form a second calculation rule; if the second calculation rule The corresponding expected result set is a subset of the result set corresponding to the first calculation rule, and the result set of the first calculation rule is used as the input data matched by the second calculation rule. Compared with the prior art, the beneficial effect of the present invention is that different calculation rules can be formed according to different condition groups, and the calculation method can be optimized by judging the correlation degree between the calculation rules to avoid redundant calculation and redundant storage.

The invention discloses a dispersion and nonlinear compensation method and system in a coherent optical communication system, and relates to the communication field. The method disclosed in the present invention includes: dividing the total length of the optical fiber into N steps of equal length, first performing dispersion compensation in each step, and then performing nonlinear compensation; wherein, when performing nonlinear compensation in each step, the The current sampling point is the center, and the X and Y value polarization states of the current sampling point are sampled at 2k+1 sampling points, and the power of 2 (2k+1) sampling points is calculated, and the samples with the same position on the X and Y polarization states are Add the power of the points to get 2k+1 power values, weight and sum the 2k+1 power values, and then multiply the weighted sum value by the set coefficient W to get the nonlinear phase angle of the current sampling point, according to Non-linear phase angle compensation. The invention also discloses a dispersion and nonlinear compensation system in the coherent optical communication system. The technical solution of the present application improves the calculation method of the nonlinear phase angle and reduces the calculation complexity.

The present invention provides a method, device and server for locating partial discharge sources in transformers, wherein the method includes: collecting acoustic signals generated by partial discharges in transformers through a plurality of acoustic sensors arranged at preset positions of transformers; The acoustic signal corresponding to each acoustic sensor is subjected to noise reduction processing; according to the signal energy or information amount of the acoustic signal after the noise reduction processing, determine the time length for each acoustic sensor to receive the acoustic signal; according to the position and time length of each acoustic sensor , to determine the location of the partial discharge source within the transformer. In the present invention, the time length for each acoustic sensor to receive the acoustic signal is determined based on the reference time point at which each acoustic sensor starts to collect signals at the same time. This relative time method is conducive to optimizing the calculation of the location of the partial discharge source in the subsequent transformer. way, thereby improving the accuracy of the location of the partial discharge source in the transformer.