40 results about "Functional expression" patented technology

The invention provides a physical knowledge constrained intelligent aerodynamic prediction model modeling method. The physical knowledge constrained intelligent aerodynamic prediction model modeling method comprises the following five steps: (1) acquiring aerodynamic physical knowledge through data mining; (2) obtaining a function expression of aerodynamic force; (3) approximately replacing a function expression of aerodynamic force by adopting a depth operator neural network; (4) training a depth operator neural network; and (5) carrying out full-profile aerodynamic modeling based on the trained depth operator neural network.

The application discloses a Zanthoxylum bungeanum protein characteristic data-driven modeling method and system for functional expression, belongs to the technical field of food protein data modeling, obtains protein characteristic indexes, functional expression indexes and impurity interference indexes of Zanthoxylum bungeanum protein samples under different processing conditions, forms corresponding data and carries out standardization and abnormal data processing; based on the correlation degree of the protein characteristic indexes, the functional expression indexes and the impurity interference indexes, functional contribution factors and impurity domination factors are determined respectively, and comprehensive weights are generated; the protein characteristic data is weighted by using the comprehensive weights to obtain function-oriented protein characteristic data; then principal component extraction is carried out, and function-oriented principal components are screened according to the correlation between the principal components and the functional expression data and the impurity interference data; finally, a Zanthoxylum bungeanum protein functional expression prediction model is established; the application can weaken the influence of interference information such as pigments, turbidity, residual oil rate and non-protein particles on modeling, and improve the functional prediction stability.

The present application is a kind of geotechnical particle contact creep deformation discrete element numerical simulation method, the method is used to simulate long time contact creep between coarse particles, respectively determine four parameters in burgers model of normal coarse particle contact creep and tangential coarse particle contact creep;Obtain the corresponding four parameters under all different normal loads, the corresponding four parameters under all different normal loads and different tangential loads, respectively function fitting with load as independent variable and parameter as dependent variable, respectively obtain the function expression of eight parameters and load, and embed burgers model in PFC3D software;When the input normal load and tangential load are determined, the parameters in burgers model can be dynamically adjusted, and then the particle contact creep displacement under any load condition and time can be obtained. Break through the limitation of laboratory test, realize the quantitative prediction of rheological deformation of coarse aggregate in actual engineering.

This invention provides an FPGA-accelerated database query method, apparatus, device, and medium, comprising: inputting a query SQL into a row parsing module in the FPGA hardware core to obtain a first data stream; inputting the first data stream into a filtering module to obtain a second data stream; inputting the second data stream into a calculation module to obtain a third data stream; and inputting the third data stream into a projection output module to obtain a target data table. The row parsing module is used to split the data table into column data based on the configuration corresponding to the query SQL and put it into the stream; the filtering module is used to execute the filtering condition clause corresponding to the query SQL on the input data stream; the calculation module is used to execute the function expression calculation corresponding to the query SQL on the input data stream; and the projection output module is used to encapsulate the input data stream into row data. This invention aims to improve the versatility of FPGA-accelerated database SQL queries.

The invention discloses a spatial geometric model display method and system based on advanced mathematics, which can realize full-automatic and high-fidelity conversion from an original function expression to a three-dimensional rotating curved surface by constructing an advanced mathematics symbol analysis method. A dynamic sampling strategy based on a function change rate and a quaternion space rotation mechanism are adopted, and geometric accuracy and calculation stability of complex functions, especially piecewise functions and implicit functions under any rotation axis are guaranteed; real-time rendering and mathematical formula synchronous deduction are combined, an intuitive mapping relation from algebraic expression to spatial form is established, and the understanding depth of students on the rotating curved surface generation principle is remarkably enhanced; interactive operation and a multi-level teaching auxiliary function are introduced, the sense of participation and teaching applicability of the demonstration process are improved, the method is suitable for university mathematics public courses and engineering professional basic teaching scenes, and the structural defects of an existing visualization means in the aspects of semantic comprehension, adaptation flexibility and teaching fusion degree are effectively overcome.

The invention provides a database access method and system supporting unified authentication and business model mapping, and the method comprises the steps: uniformly converting a query request into a standard abstract syntax tree, and intercepting an identity certificate in the query request to construct a complete authority context object; mapping the permission context object into a temporary role name with the minimum required permission, and sending the temporary role name to a key management system to generate a temporary database connection voucher; the permission context object is received, and a specific RLS predicate character string and a CLS function expression are generated based on a preset RBAC strategy rule, an RLS constraint predicate template and a CLS constraint desensitization function template; based on the business model, mapping the standard abstract syntax tree to generate an initial logic query plan; and according to the RLS predicate character string and the CLS function expression, forcibly solidifying the security policy into the initial logic query plan to generate a target logic query plan. The technical problem that authentication and authorization mechanisms are separated in the prior art is solved.

This invention proposes an online correction method and system for sine and cosine signals of a rotary transformer, relating to the technical field of servo control. The method involves fitting the demodulated original sine and cosine signals using second-order polynomial functions to obtain second-order sine and cosine polynomial expressions, respectively. The term matrix and the parameter matrix to be optimized are then extracted to obtain the sine and cosine matrices. Based on these matrices, a sine and cosine correction error function is constructed. With the goal of minimizing the sine and cosine correction error function, the method uses the parameter matrix to perform online iterative solutions, thereby completing the online correction of the rotary transformer's sine and cosine signals. This method has low computational complexity and short processing time. Compared to directly decoding uncorrected sine and cosine signals, it improves the linearity of the subsequent decoding angle and reduces decoding speed fluctuations.

The invention provides an assembling mode of RNA liquid drops deformed through photostimulation and application of the RNA liquid drops, and belongs to the technical field of preparation of nucleic acid for analysis. The method comprises the following steps: mixing an RNA single strand with a buffer solution through structural design to obtain a mixed system with a specific concentration; after the mixed system is subjected to heat shock to complete base pairing and assembling, sealing and packaging are performed, the RNA liquid drops deformed through photostimulation are obtained, and the diameter of the liquid drops is 7.0-13.0 microns. The RNA liquid drop obtained in the embodiment can deform under light stimulation, behavior regulation and control can be achieved through group modification, and feasibility is provided for construction and functional expression of artificial cells.

The application discloses a water adding flow calculation method for a moisture regaining machine. The moisture regaining machine is provided with a motor, a rotating shaft and helical blades. The motor is used to drive the rotating shaft and the helical blades to rotate in the moisture regaining machine, so as to transport materials from the inlet of the moisture regaining machine to the outlet of the moisture regaining machine. The calculation method comprises the following steps: obtaining an outlet moisture content target value, an inlet moisture content measured value and an inlet flow measured value of the materials; calculating a water adding flow basic value according to the outlet moisture content target value, the inlet moisture content measured value, the inlet flow measured value and a first functional expression; obtaining a frequency of the motor and a steam pressure value in the moisture regaining machine; calculating a water adding flow adjustment value according to the frequency of the motor, the steam pressure value and a second functional expression; and calculating a total water adding flow according to the water adding flow basic value, the water adding flow adjustment value and a third functional expression. The water adding flow of the moisture regaining machine can be calculated according to the relevant parameters of the materials at the inlet of the moisture regaining machine. The application further discloses a computer readable storage medium.

The invention discloses a dynamic load prediction method and device for a double-layer vibration isolation system under the variable stiffness condition. The method comprises the steps of firstly establishing a multi-degree-of-freedom dynamic model of the double-layer vibration isolation system, then describing structural displacement based on a frequency domain transfer function, further deriving a function expression of a to-be-identified dynamic load about dynamic characteristics of the double-layer vibration isolation system, and finally obtaining a relational expression between the to-be-identified dynamic load before and after stiffness change. When the rigidity of a lower-layer structure in a double-layer vibration isolation system of mechanical equipment changes, the dynamic load borne by the lower-layer structure needs to be accurately predicted so as to guarantee safe and stable operation of the equipment. The method is simple and easy to implement, the dynamic load can be recognized only through the dynamic characteristics of the structure, inverse operation in a traditional dynamic load recognition method is avoided, and the recognition precision is improved. Besides, under the variable stiffness condition, the method can quickly predict the load after the stiffness is changed on the basis of the load identified before the stiffness is changed, and compared with a traditional dynamic load identification method, the identification efficiency is improved.

The invention discloses a distributed N + 1 salary settlement system based on a block chain, and relates to the technical field of computer software. The system comprises a configuration center module for constructing salary item configuration and rule binding data, a salary item management module for generating a structured salary item model, a rule engine module for analyzing rule expression and field dependence, a data adapter module for completing field normalization and standardization processing, a dynamic formula analyzer for generating a rule function set, and a rule function module for generating rule function data. The multi-source data access module constructs a callable field dictionary, the 1 + N salary model module generates aggregation configuration data, the settlement core module executes a distributed calculation task, and the salary report module completes multi-role report generation and chain registration. By constructing an extensible salary structure, field normalization and a dynamic rule calculation mechanism, multi-source data adaptation, rule functional expression and on-chain right confirmation processing of a distributed settlement result are achieved, and the configuration flexibility, calculation concurrency and data credibility of a salary system are improved.

The invention discloses a function expression method for milling an aviation aluminum alloy stress wave in a real number field, relates to the technical field of aviation aluminum alloy milling, and aims to solve the problems that an existing three-dimensional stress wave model is complex in solution, time-consuming and difficult to guarantee in accuracy. The method comprises the following steps: firstly, judging the contact condition of an end mill and a workpiece, and calculating the instantaneous cutting layer thickness of a milling infinitesimal by utilizing a cutter tooth instantaneous contact relationship; on the basis of a one-dimensional stress wave theory, the size of a milling stress wave excitation source is calculated by combining the obtained thickness of the cutting layer; and finally, constructing a longitudinal wave fluctuation equation by using a Lame-Navier equation, and solving a partial differential equation by using a Laplace transformation method to obtain a function expression of stress waves in a real number field. According to the method, the stress wave solving process is simplified, the calculation precision and efficiency are improved, and a basic calculation method is provided for high-stability machining of the milling aviation aluminum alloy and stress wave related research.

The invention provides a quick modeling method for a simple geometry of a ceramic matrix composite, which comprises the following steps of: acquiring real braided structure data of an actual simple geometry in a CT (Computed Tomography) scanning mode, and extracting characteristic parameters of the real braided structure data; inputting the characteristic parameters and preset modeling auxiliary parameters to a Matlab end, performing function expression calculation of the number of cycles and a sweeping curve to generate discrete point coordinates of a yarn sweeping line, and storing the discrete point coordinates to a control file; and on the basis of the discrete point coordinates, constructing a yarn entity array of the flat plate geometry in a UG GRIP program, outputting a flat plate weaving entity, carrying out modeling on the revolving body geometry, obtaining a yarn entity array of a revolving body weaving structure, and outputting a revolving body simple geometry weaving entity. According to the method, the matlab and UG secondary development program is adopted, rapid modeling of the simple geometry is achieved, the modeling time is saved, program parameterization is achieved, the size of parameters can be changed at will, and the practicability and applicability of modeling are greatly improved.

The invention discloses a calculation method of an integral transformation fracture phase field model of an exponential cohesion law, and belongs to the technical field of finite element analysis of phase field models. The method comprises the following steps: deducing a cohesion eigenfunction of an index cohesion law by using a subprogram, deducing an analytical expression of an index energy density eigenfunction, and solving the expression of the index energy density eigenfunction and first two-order derivatives thereof by adopting multiple integral transformations, the Maclaurin series is adopted to determine an index energy density eigenfunction expression and an expansion expression of the first two-order derivatives at the zero point of the index energy density eigenfunction expression; and inputting the index energy density eigenfunction expression, the first two-order derivatives of the index energy density eigenfunction expression, and the expansion expression of the index energy density eigenfunction expression and the first two-order derivatives of the index energy density eigenfunction expression at the zero point into a solver for performing an integral transformation fracture phase field model to perform phase field model simulation calculation. According to the method, the simulation calculation of the exponential integral transformation fracture phase field model can be realized under a universal finite element framework, and the accuracy and the calculation efficiency are greatly improved.

The invention discloses a non-circular gear pair pitch curve design method without a function expression, and the method comprises the following steps: S1, drawing a driving wheel rotation angle-radial curve; s2, extracting point set coordinates; s3, setting a center distance; s4, calculating the rotating angle of the driven wheel; s5, driven wheel pitch curve closure judgment; s6, a driving wheel pitch curve is constructed through spiral lines; s7, a planet carrier is constructed; s8, creating a pitch curve contact point tracking circle; s9, tracking a pitch curve contact point; and S10, connecting the pitch curve contact points in series to form a driven wheel pitch curve. According to the method, any spline curve is drawn to serve as a driving wheel rotation angle-radial curve, data calculation is conducted after point set coordinates are extracted, the driving wheel pitch curve and the driven wheel pitch curve are obtained through spiral line fitting and motion simulation means, complex pitch curve function expression derivation is avoided, design efficiency is high, and the method is easy to implement. And the whole design process is more free, and the method has a good application prospect.

The application provides a method and system for determining the service life of a spring, which determines the stiffness coefficient of the spring by the spring deformation and the load obtained before and after the fatigue test of the spring, calculates the release time corresponding to different fatigue test times according to the stiffness coefficient and the pre-determined initial parameters of the spring, finally determines the functional expression of the release time according to the corresponding relationship between the fatigue test times and the release time, and determines the fatigue test times of the spring to be tested, that is, the service life, according to the functional expression and the set release time threshold. The method and system consider the actual working environment and load condition of the spring, calculate the influence of the spring relaxation on the release time, and thus predict the service life of the spring. The method is convenient to operate, simple to calculate, and high in reliability, and improves the efficiency and accuracy of determining the service life of the spring.

The application discloses a representative monitoring data-driven water diversion project check gate over-flow formula partition construction method, which comprises representative monitoring data set construction, over-flow state division, partition over-flow formula description, flow state transition interval segmentation point optimization model, each flow state partition over-flow formula coefficient calibration, partition over-flow formula result model verification and evaluation, check gate over-flow dynamic prediction and the like. Advantages are that different flow states are partitioned and fitted, and corresponding function expressions are constructed to improve over-flow simulation precision. The method provides a reference for water delivery scheduling work condition pre-play and scientific scheduling plan making, and further provides technical support for open channel water diversion project water supply safety.

This application discloses a method, apparatus, device, and storage medium for determining the natural frequency of a linear motor, aiming to determine the natural frequency of a linear motor more quickly and accurately. The method includes: constructing an equivalent model of the linear motor based on whether it is mounted on a base; when the equivalent model is a double-layer plate structure, establishing a displacement function expression for the middle surface of the double-layer plate structure based on the first-order shear deformation theory; when the equivalent model is a triple-layer plate structure, establishing a displacement function expression for the middle surface of each single-layer plate in the triple-layer plate structure based on the first-order shear deformation theory and Zig-Zag theory; performing energy calculations on the equivalent model to obtain kinetic energy, strain energy, and spring potential energy; constructing a Lagrange energy function expression based on the function expression of the equivalent model, kinetic energy, strain energy, and spring potential energy, converting it into an eigenvalue equation, solving it, and obtaining the angular frequency of the linear motor to determine its natural frequency.

The invention belongs to the technical field of image data processing, and particularly relates to a function image dynamic drawing device for mathematical analysis, which comprises an intelligent function analysis module used for receiving a symbolized expression, natural language description or function type selection information input by a user; obtaining a legal and structured first function expression; the function model hierarchy unit is connected with the intelligent function analysis module; the parameter configuration module is used for matching to obtain a corresponding parameter range and a step length recommendation value; the dynamic calculation module is used for receiving the output data and the parameter real-time adjustment value of the function model hierarchy unit to obtain first data meeting the scene precision requirement; and the scenarized adaptive rendering module receives the first data and the scene type identifier output by the dynamic calculation module, and adopts a layered rendering architecture to respectively render a first function image layer, a second data auxiliary image layer and a third function comparison image layer to obtain a dynamic image.

This invention relates to the field of mechanical manufacturing and processing technology, and discloses a method for predicting the three-dimensional roughness of hole walls in CFRP machining. The invention first establishes a cutting force-cutting height equation through the cutting force equation to obtain the functional relationship between load and surface height. Then, through orthogonal cutting experiments, the coefficients in the functional expression are determined, ultimately yielding a complete calculation expression for predicting the three-dimensional roughness of the hole wall. Based on this expression, only the force signal or other signals that can be converted into force signals need to be monitored to predict the three-dimensional roughness of the hole wall in real time during machining, thereby achieving real-time monitoring of hole quality during machining, avoiding machining damage, and improving machining efficiency.

The invention discloses a calculation method of an integral transformation fracture phase field model of a PPR cohesion law, and belongs to the technical field of finite element analysis of phase field models. The method comprises the following steps: inputting a PPR potential into a subprogram; deriving a cohesion eigenfunction of the PPR cohesion law by using a subprogram, and after obtaining an analytical expression of a PPR energy density eigenfunction conjugated with the cohesion eigenfunction based on integral transformation, solving an expression of the PPR energy density eigenfunction and first two-order derivatives thereof by using a complex Simpson integral; determining an expansion expression of first two-order derivatives of the PPR energy density eigenfunction by adopting Maclaurin series; inputting the PPR energy density eigenfunction expression, the first two-order derivatives of the PPR energy density eigenfunction expression and the corresponding expansion expression into a solver to obtain a simulation calculation result. According to the method, the simulation calculation of the integral transformation fracture phase field model of the PPR cohesion law can be realized under a universal finite element framework, and the accuracy and the efficiency are improved.

The application discloses a kind of fuel cell residual life prediction method, device and nonvolatile storage medium.Therein, the method includes: obtaining the coefficient corresponding to fitting polarization curve of fuel cell;The relationship between slope coefficient and operation time, the relationship between intercept coefficient and operation time are fitted respectively, to obtain first function expression and second function expression, wherein, first function expression represents the change relationship between slope coefficient and operation time, second function expression represents the change relationship between intercept coefficient and operation time;Based on first function expression, second function expression and the life voltage threshold of fuel cell preset, determine the predicted residual life of fuel cell.The present application solves the technical problem that current cannot be based on polarization curve change in real time, accurately predict the residual life of fuel cell on vehicle controller.

The application discloses a kind of visual ETL process data processing method, device, computing device and storage medium.It is according to the technical scheme provided in the application, define process component, the function operator of the process component and process control expression;In the icon corresponding to the process component is combined in visual platform, constructs ETL process;According to the function operator of the process component and the process control expression, determine ETL process function expression;According to ETL process function expression, online ETL process.Through the application, ETL process can be constructed, and different dimensions in ETL process function expression are pre-checked, the ETL process is optimized from function operator, cyclomatic complexity and the like, simplifies ETL process function expression, greatly reduces the complexity of the ETL process and the probability of error, improves information expression efficiency, while monitoring ETL process by slicing preset mode, improves the maintainability of ETL process.

A multi-objective digging trajectory planning method for mining electric shovels based on a sinusoidal transition S-curve belongs to the field of trajectory planning technology. First, the functional expressions of the geometric model of the working material pile, the forward kinematic model of the bucket tooth tip of the mining electric shovel, and the mapping function between the drive motor and the push rod are constructed respectively. Second, a driving force prediction model for the mining electric shovel digging process is established based on historical data, outputting the output forces of the push motor and the lifting motor. Third, the velocity and displacement expressions and optimization models of the sinusoidal transition S-curve applied to the drive motor are established. Finally, an optimization algorithm is used, with the objective function as the optimization objective and the constraint function as the optimization boundary, to optimize the variables and obtain a comprehensive optimal digging trajectory that achieves optimal operating efficiency, bucket loading capacity, and equipment energy consumption while meeting actual working conditions. This invention can enhance the comprehensive operating performance and operational stability of mining electric shovels under complex working material pile conditions.

The invention relates to the field of mechanical arm calibration, and discloses an ultra-redundant mechanical arm calibration method and system based on a movable measuring arm, a medium and device.The method comprises the steps that a target on a joint k at the tail end of a series k-degree-of-freedom ultra-redundant mechanical arm is obtained through image acquisition equipment installed at the tail end of the calibrated movable measuring arm; and then the actual pose of the tail end joint of the super-redundant mechanical arm is indirectly obtained. A measurement configuration is selected, and a nominal positive kinematics model of the redundant mechanical arm is established based on the MDH criterion; a functional expression of each joint rotation angle error relative to all joint rotation angles is constructed on the basis of a Chebyshev polynomial, the flexible characteristics of the mechanical arm joints are represented by the functional expressions, and a rigid-flexible coupling calibration model is further established on the basis of differential transformation, so that integration of kinematics parameter errors and joint flexibility errors is achieved; and respectively establishing iteration rules for various parameters, comprehensively carrying out iteration progressive identification, and carrying out step-by-step classification compensation on an identification result to obtain corner instructions of all joints after final compensation.

This invention relates to the field of open channel hydraulic calculation and hydraulic engineering design calculation technology, specifically to a method for solving the normal water depth of a flat-bottomed catenary linear open channel and related products. Addressing the problems of initial value sensitivity, candidate point overshooting, and instability in small-angle calculations in existing solutions, this invention introduces an angular variable to establish a water depth mapping, constructs a logarithmic domain univariate equation, and employs a combined solution using adaptive root envelope, Halley third-order update, and bisection backoff. Furthermore, it utilizes a stable hyperbolic function expression and Taylor expansion to suppress errors, outputting the normal water depth and corresponding hydraulic elements for channel design verification and water surface line calculation.

The invention discloses an AHFO water content calibration model establishment and application method considering heating power, and the method comprises the steps: building a function expression of a temperature characteristic value Tt based on a water content calibration model; heating power is selected, heating tests are conducted on soil samples with different water contents w, and a temperature rise curve and a temperature characteristic value are obtained; fitting a fitting parameter value in the function expression of the temperature characteristic value Tt; calculating a fitting parameter value in the function expression of the temperature characteristic value Tt of any heating power by utilizing a conversion relational expression among fitting parameters; a Tt-w calibration formula under any target heating power is determined, and calculation of the water content w of the soil body under any heating parameter is completed; according to the method, the application limitation of a traditional empirical formula under the variable power condition is broken through, and a solid theoretical support and a reliable technical basis are provided for realizing high-precision and standardized in-situ identification and dynamic monitoring of soil moisture under various working conditions.

The invention discloses a method for evaluating the effectiveness of impact test data in a material ductile-brittle transition temperature test, and relates to the technical field of material aging analys.The method comprises the steps that S1, a function expression of a material ductile-brittle transition curve is determined according to test data, and the material ductile-brittle transition curve comprises an upper platform area, a lower platform area and a ductile-brittle transition area; s2, calculating discreteness parameters of test data in the ductile-brittle transition region; s3, calculating the deviation of the test data in the ductile-brittle transition zone relative to the transition curve; s4, calculating an upper envelope line and a lower envelope line of a 95% confidence interval of the transformation curve according to the discreteness parameter and the deviation; and S5, judging the validity of the test data according to the upper envelope line and the lower envelope line. According to the method provided by the invention, the upper and lower envelope lines of the impact data approximate to 95% confidence interval can be given, so that the validity of the test data can be judged.

The invention discloses an automatic optimization method for SysML model parameters. The method comprises the following steps that S1, a SysML architecture model facing system task constraints is constructed, and design variables and target attributes are marked; s2, modeling a system performance constraint relation based on the parameter diagram and establishing a target function expression; s3, analyzing the model semantics to automatically extract an optimization problem and converting the optimization problem into a standard mathematical form; and S4, solving based on a multi-objective optimization algorithm and feeding back a result. According to the method, the hierarchical structure of the SysML model, the relation semantics and the attachment characteristics of the parameters are fully considered, deep fusion of system modeling and performance optimization can be achieved, optimization targets, design variables and constraint conditions in the model are automatically recognized and extracted, a standardized mathematical optimization model is formed, and the optimization efficiency is improved. The parameter configuration efficiency and the design decision quality in the complex system design are remarkably improved, and the method has good universality and expansibility.

The invention discloses a representative monitoring data-driven water transfer project check gate overflowing formula partition construction method. Comprising the steps of representative monitoring data set construction, lockage flow regime division and partition overcurrent formula description, flow regime transition interval segmentation point optimization model, flow regime partition overcurrent formula coefficient calibration, partition overcurrent formula result model verification and evaluation, check gate lockage flow dynamic prediction and the like. The method has the advantages that partition fitting is carried out for different flow states, and function expressions corresponding to the flow states are constructed to improve the lockage flow simulation precision. Reference is provided for water delivery scheduling working condition rehearsal and scientific scheduling plan making, and then technical support is provided for water supply safety of an open channel water transfer project.