46results about How to "Efficient calculation method" patented technology

The invention provides an axis-invariant-based multi-axis robot inverse kinematics modeling and solving method. The method is implemented based on the fixed axis invariant D-H system and D-H parameterdetermination principle, the Ju-Gibbs quaternion and quasi direction cosine matrix principle, the axis invariant general 6R mechanical arm inverse solution principle and the axis invariant general 7Rmechanical arm inverse solution principle. The principles have the characteristics of being general, convenient and accurate and can be set into circuits and codes and be executed directly or indirectly and partially or totally in a multi-axis robot system. Besides, an analysis and verification system established based on the principles is also included and used for designing and verifying the multi-axis robot system.

The invention relates to an on-vehicle road grade recognition device based on a low-cost acceleration transducer and a method thereof, belonging to the technical field of automotive electronics. The device comprises an on-vehicle embedded computer with two serial ports, as well as an acceleration module and a vehicle speed module respectively connected with the on-vehicle embedded computer. The acceleration module is composed of an acceleration transducer, an analog-digital conversion module and a singlechip. The method comprises the following steps: acceleration data and vehicle speed data are read in sequence; the obtained acceleration data is averagely processed and then taken as the present transducer acceleration; the motion acceleration of a last moment is obtained by calculation according to the present vehicle speed and the vehicle speed of a last moment; and the road grade is obtained by calculation according to the transducer acceleration of a last moment and the motion acceleration of a last moment and taken as the presently recognized road grade value. By adopting the low-cost acceleration transducer, the device and the method are characterized by low cost, small volume, convenient installation, and the like.

The invention discloses a population distribution calculation method. The method includes: firstly, preprocessing a mobile phone base station and on-line population distribution thermodynamic map datain a research area, wherein the Tyson polygon set is established for the base station data of the mobile phone, which is denoted by S; capturing the original point data of the online population distribution thermodynamic map of the corresponding area, and generating the grid data of the population distribution density by using the kernel density method, which is recorded as Z; secondly, finding the corresponding maximum points of online population distribution thermodynamic map for each plot in set S; and then forming a maximum point data set M; Finally, a new population thermodynamic map isgenerated by using the point data set M and the point kernel density algorithm. The invention integrates the characteristics of online population distribution thermodynamic map and mobile phone signaling data, can utilize different types of population thermodynamic map data to improve the accuracy of population distribution calculation, and provides decision basis for urban planning and traffic management.

The present invention belongs to the technical field of non-destructive testing of concrete beams, and discloses a non-destructive testing system and method for pre-stressed concrete beams. The non-destructive testing system comprises: a pre-stress acquisition module, a strength detecting module, an anti-seepage detecting module, a main control module, a crack resistance testing module, and a pre-stress simulation module, a data storage module, and a display module. The method is characterized in that: identification and intelligent analysis are performed on the strength of the concrete through the strength detecting module, and the strength of the concrete structure can be accurately determined; and the pre-stressed tendon and the concrete unit are separately established by the pre-stresssimulation module, so that only specifying the pre-stressing force, the cross section area, the linear expansion coefficient and the elasticity modulus of the pre-stressed tendon can calculate the cooling value applied to the pre-stressed tendon. According to the method provided by the present invention, the actual effect of the pre-stressed tendon is considered, and the pre-stressing effect canbe effectively simulated; and in the complex pre-stressed concrete structure, only the cooling value of the pre-stressed tendon needs to be calculated, and the calculation result is accurate and the calculation method is efficient.

The invention belongs to the technical field of radiotherapy, and relates to a rapid radiation dose calculation method and equipment for complex radiation fields and a storage medium. The method includes defining parameters of a beam limiting device: preforming grid operation of a radiation field, and distributing calculation tasks of each grid to each calculation unit; preforming dose calculationon particles; then overlapping the dose of individual grids; merging and summing the overlapped adjacent grids with the same weight to obtain the dose under a single thread; and finally, summing thedose of all individual threads to obtain a dose calculation result of the complex radiation fields. According to the method, a single-energy or multi-energy beam reaches a radiation field plane of a phantom or a human body and divides the plane into a plurality of grids, and equal or unequal numbers of grids are assigned to each parallel thread, so that simulation calculation of complex radiationfields can be quickly and efficiently carried out without losing precision; and the calculation method can further be transplanted to GPU or other parallel calculation platforms.

The invention discloses a power grid topology dynamic analysis method based on a DSTU and association matrixes. The power grid topology dynamic analysis method comprises the steps of: arbitrarily numbering grid nodes, installing a DSTU in each switch, and acquiring grid typological structure information by means of the DSTUs; construing a first association matrix A of the grid nodes according to the acquired grid typological structure information; setting a transformation rule according to the form of a power grid, and converting the first correlation matrix A into a second correlation matrixA' based on the transformation rule; extracting a corresponding standard triangular matrix from the second correlation matrix A' to obtain a network typological structure diagram of the power grid; and if the network structure changes, extracting the topological structure information by means of the DSTUs, and disconnecting or connecting edges among the power nodes to realize power grid topology dynamic analysis. The power grid topology dynamic analysis method provided by the invention can analyze the real-time typological structure of the power grid rapidly, identify the nodes of ports in thepower grid, and has simple and efficient calculation method.

The invention discloses a degradation conversion rate calculation method and system based on an epoxy resin alcoholysis model, and belongs to the technical field of thermosetting epoxy resin degradation and recovery. The method comprises the following steps: pouring epoxy resin to cure and mold, carrying out an epoxy resin alcoholysis degradation experiment at different temperatures, and recording degradation conversion rates at different moments; constructing an epoxy resin geometric model, and analyzing to obtain a degradation conversion rate differential expression containing reaction rate constants and geometric parameters; solving the differential equation to obtain a reaction rate constant, and fitting by using an Arrhenius formula to obtain degradation activation energy; analyzing a transesterification process of the epoxy resin and the alcohol solvent and a diffusion process of the alcohol solvent in the epoxy resin, and establishing a degradation conversion rate expression which does not contain geometric dimension parameters; and substituting degradation reaction activation energy, and fitting to determine a degradation conversion rate expression which does not contain geometric dimension parameters. The invention aims to provide a reference for the degradation process analysis of the large-size epoxy resin with a complex shape.

The invention relates to a finite difference method of a fine simulation tubular well structure. The finite difference method of the fine simulation tubular well structure comprises the steps of: firstly performing finite difference grid division on a well computation space based on a research need and establishing a finite difference relationship of water balance on grid nodes; then performing value assignment of hydrogeological parameters on a ground layer where the well locates based on a practical project, setting a known water-head border or fixed water-head border and a water-isolating border at a well filter pipe to distinguish a well wall, a filter pipe hole, a filter pipe surrounding stuffing and a practical ground surface; then establishing a linear equation group of the water balance based on an underground water three-dimensional unsteady flow equation; and finally solving the equation through Gauss-Seide iteration to obtain water-head values of nodes. The finite difference method of the fine simulation tubular well structure, disclosed by the invention, has the advantages of being simple and efficient, and is suitable for finite difference value simulation design of any well fine structure.

The invention discloses a vehicle-mounted road slope identification device based on an embedded system. The vehicle-mounted road slope identification device is characterized by comprising a vehicle-mounted embedded computer with three serial ports, an acceleration module connected with the vehicle-mounted embedded computer through a first serial port, a vehicle speed module connected with the vehicle-mounted embedded computer through a second serial port, and a timer connected with the vehicle-mounted embedded computer through a third serial port, wherein the acceleration module consists of an acceleration sensor, an analog / digital conversion module and a singlechip; the output end of the acceleration sensor is connected with the singlechip through the analog / digital conversion module; the singlechip is connected with the input end of the embedded computer through the serial port; a power supply module supplies power to each module through a vehicle-mounted power supply.

The invention provides an irregular object volume measurement method and system based on point cloud data, and the method comprises the steps: projecting the information of the point cloud data of a measured irregular object to a Z axis of a space system, determining a probability density function on the Z axis, determining a curvature function on the Z-axis projection, and calculating the curvature of each point on the Z-axis projection through the curvature function; according to the curvature of each point, the set reference spacing, the reference curvature and the relative spacing coefficient, determining a list of optimal lengths of spacing between adjacent slices on the z axis; slicing the point cloud according to the list to sequentially obtain a z-axis direction point holder body; carrying out boundary detection on the cross section of each slice, and calculating the cross section area of each point cloud slice; and determining the volume of each table body according to the cross section area of each point cloud slice and the height of each table body, and adding all table bodies to obtain the final volume of the measured irregular object. The method and system are simple in measuring process, reliable in result, efficient and controllable in precision.

The invention relates to a method for calculating the area of a building window, and the method comprises the following steps: selecting a window in a building as a calibration window, and performing measuring to obtain the size information of the calibration window; photographing the building by using the unmanned aerial vehicle to obtain a building image; establishing a three-dimensional live-action model by utilizing the building image; intercepting a vertical view of the three-dimensional live-action model to obtain a screenshot image as training data; obtaining a window object detection model through training data training based on an EsyDL platform; obtaining a vertical view of the three-dimensional live-action model as a calculation image; intercepting a calibration window in the three-dimensional live-action model to obtain a calibration image; attaching the calibration image to the edge of the calculation image, and inputting the calibration image into a window object detection model to perform window object detection to obtain all detection windows; and calculating the areas of all detection windows by using the calibration window size information, so the building window area is obtained. According to the building window area calculation method, automatic calculation is achieved, labor is saved, and the calculation efficiency and the calculation precision can be improved.

A convolutional neural network character recognition method running on an ARM comprises the steps that all weight layers of a neural network are quantized into n-th power of 2, and all active layers are quantized into 8-bit signed integers; during calculation of the neural network, all multiplication operations can be replaced by shift operations, the advantage of high efficiency of bit operationsof an ARM processor is fully played, the defect of long time consumption of ARM floating point operations is overcome, and complex neural network calculation can be deployed on embedded equipment with low operational capability and low power consumption.

The invention discloses a multi-level quantifiable calculation method for comprehensive ability analysis of preschool children. The multi-level quantifiable calculation method comprises the steps of obtaining a question list in a test process; obtaining test questions from the question list, and identifying the test questions as test questions; querying a target capability list and a number corresponding to the test question; obtaining the investigation capability from the target capability list, and identifying the investigation capability as the investigation capability; loading sub-capability items contained in the capability according to the serial number and the investigation capability, and calculating a score value; dynamically loading a sub-capability module, executing a scoring function and storing a result into a sub-capability list; calculating quantitative scores of all the sub-capabilities according to the sub-capability list; setting a corresponding score on the memory tree according to the calculated score and the capability ID; and reconstructing the score of the memory tree to obtain an updated scoring result.

The invention discloses a prestress equivalent simulation method in finite element analysis of a complex prestressed concrete structure in the field of water conservancy and hydropower engineering. The prestress equivalent simulation method comprises the following steps of establishing a concrete structure unit according to structure arrangement and size; establishing pre-stressed tendon units according to the specifications and sizes of pre-stressed tendons configured in the concrete structure; applying the cooling value to the prestressed tendon unit, so that the shrinkage force generated byshrinkage of the prestressed tendon is used for simulating the pre-pressing stress of the prestressed tendon on the concrete. The beneficial effects of the invention are as follows the prestressed tendons and concrete units are established respectively; only the prestressing force of the prestressed tendons, the cross-section area, the linear dilatation coefficient and the elasticity modulus needto be clear, so that the actual effect of the prestressed tendons is considered, the prestressed effect can be effectively simulated, only the cooling value of the prestressed tendons needs to be calculated in a complex prestressed concrete structure, the calculation result is accurate, and the calculation method is efficient.

The invention provides a method and system for calculating a short-circuit current of a flexible direct current grid considering converter control. The method includes the steps that a converter station is equivalent to parallel connection of a controlled current and an RLC series branch, and a direct current grid transmission line is represented by a centralized parameter model to establish a simplified equivalent circuit of the flexible direct current grid during a short circuit; and the established equivalent circuit is solved by an accompanying circuit method to obtain a branch current when the flexible direct current grid is short-circuited. The method for calculating the short-circuit current is good in adaptability, can process various types of faults, and adapts to various networktopologies and various main wiring modes of converter stations.

The invention provides an impeller type centrifugal ventilator resistance calculation method, which comprises the following steps: determining the arrangement of impeller units and aperture units of an impeller type centrifugal ventilator according to the structural form of the impeller type centrifugal ventilator and the flow direction of airflow flowing through the impeller type centrifugal ventilator, and constructing a network framework of resistance characteristic units; determining parameter values of the corresponding resistance characteristic units according to the structure parametersand the operation parameters of the resistance characteristic units; determining the working environment of the impeller type centrifugal ventilator; and calculating the resistance of the impeller units, the resistance of the aperture units, and the overall resistance of the impeller type centrifugal ventilator with the impeller units and the aperture units according to the parameter values in the working environment. According to the method, an impeller type centrifugal ventilator resistance theoretical expression can be directly obtained through network architecture building according to the structural characteristic and size of the impeller type centrifugal ventilator, the calculation method is simple and efficient, and the method can be suitable for resistance calculation under all working conditions.

The invention provides an axis type centrifugal ventilator resistance calculation method which comprises the following steps: determining the arrangement of aperture units of an axis type centrifugalventilator according to the structural form of the axis type centrifugal ventilator and the airflow direction of airflow passing through the axis type centrifugal ventilator, and constructing a resistance characteristic unit network framework; determining parameter values of the corresponding resistance characteristic units according to the structure parameters and the operation parameters of theresistance characteristic units, wherein the working environment of the axis type centrifugal ventilator is determined; and calculating the resistance of the aperture units and the overall resistanceof the axis type centrifugal ventilator with the plurality of aperture units according to the parameter values in the working environment. According to the method provided by the invention, the resistance theoretical expression of the axis type centrifugal ventilator can be directly obtained through network architecture construction according to the structural characteristics and sizes of the axistype centrifugal ventilator, and the calculation method is simple, efficient and suitable for resistance calculation under all working conditions.

The invention discloses a block chain-based secret image sharing and recovery method, which comprises two parts of sharing and recovery of a secret image, and is characterized in that: 1) the secret image generates a group of shadow images, and the shadow images are sent to corresponding users; 2) partitioning each shadow image, and encrypting each image block; and 3) uploading the encrypted shadow image to an IPFS (Internet Protocol File System) and a block chain. The recovery comprises the following steps: 1) a certain user sends a recovery application to the smart contract; 2) the smart contract broadcasts a recovery application event to other users; 3) the secret image sharer selectively authorizes the access right to the smart contract; 4) the smart contract issues a recovery task to the block chain; 5) selecting an agent mining machine by the intelligent contract; (6) the proxy mining machine recovers the secret image in the ciphertext domain, and an encrypted secret image is obtained; and 7) the intelligent contract forwards the encrypted secret image to the application user for decryption. According to the method, the problems of stealing, tampering and losing of the shadow image can be completely prevented.

This invention provides a method for obtaining terminal ballistic parameters by combining ballistic shock wave and explosion wave data. This method solves the technical problem that existing acoustic measurement methods can only obtain the location and time of the explosion, but not the projectile velocity and trajectory direction, thus hindering accurate assessment of projectile performance. The method comprises the following steps: N acoustic measurement points (N≥2) are set up around a predetermined explosion point; the acoustic measurement points sequentially acquire the arrival direction and time of the ballistic shock wave, and the arrival direction and time of the explosion wave; the explosion point location and explosion time are obtained from the acquired explosion wave arrival direction and time; and the trajectory direction and projectile velocity are calculated from the acquired ballistic shock wave arrival direction, time, and explosion point location. This invention enables the acquisition of terminal ballistic parameters such as explosion point location, explosion time, projectile velocity, and trajectory direction, providing crucial data support for accurate projectile performance assessment.

The present invention belongs to the field of electromagnetic wave technology, and discloses a very low frequency scattering method of anisotropic ionosphere in medium and low altitude based on the transmission matrix method. The present invention establishes a low ionosphere layered model structure considering the anisotropy of the ionosphere. First, the transmission matrix of the anisotropic layered structure is derived and verified. Then, based on the transmission matrix, the scattering characteristics of the very low frequency electromagnetic waves in the above-mentioned ionosphere layered structure under different conditions are accurately calculated, and the propagation law is summarized. This work provides a reliable calculation model for the propagation of very low frequency in the low and medium ionosphere, and greatly improves the accuracy of its propagation and scattering parameter calculation. This has important guiding and reference value for studying the propagation of very low frequency electromagnetic waves in the atmosphere.

The invention provides a method, a device and equipment for extracting any section of a three-dimensional seismic data volume and a medium. The method comprises the following steps: establishing a CMP point distribution map; determining a control line of any section according to the CMP point distribution diagram; a surface element radius is given, and surface elements are divided for the control line; seismic trace data of a plurality of surface elements are subjected to parallel calculation through multiple threads; and arranging the obtained seismic trace data of each surface element in sequence to form a control line trace gather, and obtaining any section data. The invention provides a correct and efficient calculation method for solving the problem of three-dimensional seismic data volume section extraction, designs a multi-thread parallel calculation-based three-dimensional seismic data volume arbitrary section extraction algorithm, improves the section extraction efficiency, and realizes the extraction of any section.

The invention relates to a method for speculating the polymer lithium ion battery AC internal resistance. The AC internal resistance of the polymer lithium ion battery is set as the sum of the internal resistance of the positive and negative foils and the electrochemical internal resistance; an equivalent graph formed by a right triangle A, a parallelogram B and a right triangle C which are sequentially connected is built in the foil internal resistance; the internal resistance of the right triangle A part is shown in the description, the area of the right triangle C and the area of the righttriangle A are equal, and the internal resistance values are equal RC=RA; the internal resistance of the parallelogram B part is shown in the description, the internal resistance of the foil is R0=2*RA +RB; the calculation of the electrochemical internal resistance value can be carried out according to the Rct constant = Rct*S, and then the coating amount M is corrected, the electrochemical internal resistance formula is shown in the description, and the calculation formula of the AC internal resistance value of the polymer lithium ion battery is expressed as R=R0 positive + R0 negative + Rct.The method has the beneficial effects that the calculation method obtains the internal resistance value close to the actually measured value, the research on the mechanism performance of the lithiumion battery is facilitated, and more support is provided for the design of the battery.

The invention discloses a population distribution calculation method. The method includes: firstly, preprocessing a mobile phone base station and on-line population distribution thermodynamic map datain a research area, wherein the Tyson polygon set is established for the base station data of the mobile phone, which is denoted by S; capturing the original point data of the online population distribution thermodynamic map of the corresponding area, and generating the grid data of the population distribution density by using the kernel density method, which is recorded as Z; secondly, finding the corresponding maximum points of online population distribution thermodynamic map for each plot in set S; and then forming a maximum point data set M; Finally, a new population thermodynamic map isgenerated by using the point data set M and the point kernel density algorithm. The invention integrates the characteristics of online population distribution thermodynamic map and mobile phone signaling data, can utilize different types of population thermodynamic map data to improve the accuracy of population distribution calculation, and provides decision basis for urban planning and traffic management.

A fast vector analysis method for the transmission characteristics of multi-core waveguides. Including: calculating the mode field distribution of all eigenmodes and the propagation constants of all eigenmodes of the multi-core waveguide by numerical calculation or analytical solution; analyzing the mode components of the incident mode field by calculating the overlap integral, and decomposing the incident mode field It is the form of coherent superposition of eigenmode mode fields; calculate the phase change of each eigenmode after a certain transmission length, and obtain the phase of each eigenmode after a certain distance of transmission; the eigenmode mode field is calculated according to the phase and amplitude Coherent superposition is carried out to obtain the mode field after a certain distance transmission. The method of the invention only needs to perform eigenmode analysis on the cross section of the waveguide, which greatly saves the calculation cost; at the same time, the invention only includes the error of the eigenmode calculation method itself, and has the advantage that the calculation error does not accumulate with the increase of the waveguide length. The invention is an efficient and accurate analysis method for multi-core waveguides with complex shapes.

The application provides a mass data Top-kskyline group query method, including stage one, applying a verification theorem of G-skyline to scan data points in a pre-sequencing table in sequence until all data points are scanned, and a candidate point set containing all candidate points and child sets of skyline points is obtained; stage two, candidate groups are generated from the candidate point set, and judgment of enumeration rounds is completed by a left part theorem, a right part theorem and an approximate theorem; scores of the candidate groups are calculated, and a Top-k score threshold is maintained; child G-skyline groups of Top-k candidate groups are generated, and a final result is obtained by updating the Top-k candidate groups. The pre-sequencing table is used as an index structure, and only once construction can be applied to all attribute combination scenes. Early termination is realized by using pre-sequencing, and the data scale that needs to be scanned for screening candidate points is reduced. Based on three calculation theorems of the left part theorem, the right part theorem and the approximate theorem, an efficient calculation method is provided, the upper bound of G-skyline group scores is reduced, and the number of generated G-skyline groups and the calculation amount are greatly reduced.

The present invention provides a method and system for dynamically and real-time calculating the Six Sigma value of a large amount of data, including the following steps: real-time incremental construction of the original measurement data step: constructing the original measurement data, deduplicating the original measurement data, and storing them in a parallel array ;Filter and calculate the Six Sigma numerical value step: perform the Six Sigma numerical calculation after filtering the data stored in the columnar array. The present invention solves the problems of traditional Six Sigma numerical calculation cycle length and calculation result lag by real-time incremental acquisition and data conversion of original measurement data, and greatly reduces the Six Sigma numerical calculation time in the scene of large data sets; the present invention accelerates The search, screening and combination of calculation data sets are realized, and the intermediate transmission cost of data is saved; the invention solves the problem of flexible loading and dynamic combination of data in different data dimension combinations and roll-up scenarios; it provides a novel and efficient calculation method.

A frame building structure anti-seismic optimization design method considering multiple randomness comprises the steps that sensitivity formulas of structure dynamic reliability to random variable distribution parameters and deterministic variables are derived respectively based on a direct probability integral method, and an efficient and accurate analysis method for dynamic reliability sensitivity is provided; a framework building structure parameter optimization design framework is constructed by taking building structure construction cost as a target function and dynamic reliability as a constraint function, and optimization problem solving is carried out based on a dynamic reliability sensitivity analysis method and a moving asymptote method provided by the invention. Compared with a traditional building structure design scheme, the method has the advantages that near-fault seismic oscillation random excitation possibly suffered by the frame building structure and randomness of parameters of the structure are considered, and the design scheme of the frame building structure considering safety and economical efficiency is provided.

The invention discloses a composite numerical integration method for gas volume measurement in medical equipment. The method comprises the steps that the position of a high-resolution sensor is determined, original gas flow data in the medical equipment are obtained, the sampling frequency of the original gas flow data is set, and the original gas flow data are preprocessed; according to the preprocessed original gas flow data, considering the influence of environmental factors on the gas volume in the original gas flow data, and adjusting the original gas flow data through temperature and pressure correction factors; calculating and calibrating the adjusted original gas flow data, and feeding back a calculation and calibration result to a control system of the medical equipment; an efficient gas volume flow calculation method is provided in a mode of combining a composite trapezoid rule and a Simpson rule; besides, original gas flow data are adjusted through correction factors, the defect that environmental changes are neglected in a traditional method is overcome, and the real flow state of gas is reflected under different environmental conditions.