26 results about "Mathematical model" patented technology

The invention discloses a system optimization method and device of ship operation energy efficiency. The method comprises the steps of data acquisition, mathematical model establishment, analysis and calculation, output and execution; namely, acquiring speed over water and speed over ground of the ship, real-time rotating speed and instant oil consumption of ship main engine; when the ship is in much deeper water, establishing a mathematical model between the real-time rotating speed of the ship main engine and the ship speed over water and a mathematical model between the real-time rotating speed of the ship main engine and the instant oil consumption of the ship main engine; analyzing and calculating the mathematical models under different water flow velocities and different main engine rotating speeds to obtain the ship kilometer oil consumption valves of the ship corresponding to different conditions; displaying the ship kilometer oil consumption value and the corresponding main engine rotating speed to guide the operation. The method also includes a ship technical state judging and navigation operating optimizing method. The device comprises a central processer and a memory thereof, a data acquisition equipment, man-machine conversation equipment, output equipment, a power supply unit and the like.

The invention discloses a serum specificity metabolite spectrum for a patient with a lung cancer and a building method thereof, and particularly discloses a method for carrying out liquid-phase/gas-phase chromatography mass spectrometry metabonomics analysis based on the patient suffering from the lung cancer. The method comprises the following steps: collecting fasting blood samples of a healthy and normal detected person and the patient suffering from the lung cancer 7 days before and after an operation, separating by a chromatogram column after processing; extracting and aligning original data of an instrument after adopting mass spectrometry analysis; building a mathematical model to analyze the metabolites spectrum by adopting multivariable data statistical software; comparing with the difference between an average person with the metabolites spectrum of the patient with the lung cancer, so as to determine the specificity metabolite spectrum. By adopting the method disclosed by the invention, the mutation status of the metabolite of the patient with the lung cancer can be generally and comprehensively reflected, and the serum specificity metabolite spectrum can be applied to early diagnosis of the lung cancer or a beneficial technical support is supplied for prognosis.

The invention relates to the technical field of fluid measurement, and provides a flow rate measuring system and a flow rate measuring method for multi-phase fluid. The system comprises a measurement module, a signal amplification module, a data processing module and a terminal module which are connected in turn, wherein the measurement module at least comprises two measurement devices arranged on a pipeline at a certain interval, and the two measurement devices respectively measure the content of the same element passing the sections where the devices are positioned by a nuclear physics method; the signal amplification module is respectively connected with the two measurement devices and amplifies signals acquired by measurement; and the data processing module converts the signals into digital signals first, then performs digital lowpass filtering treatment and quantization treatment on the digital signals, establishes a mathematical model by utilizing a cross-correlation function principle, performs data analysis treatment on the digital signals, and outputs results of a flow and a flow rate to the terminal module. The system and the method reduce the measuring complexity, reduce corresponding errors caused and improve measuring accuracy and reliability.

The invention discloses a three-dimensional shape measuring system of fringe projection based on a sine phase modulation four-step integral, and relates to the field of three-dimensional shape measuring. The method includes the steps that an optical fiber interference fringe projection mathematical model is built; a phase error compensation system extracts phase drift amount caused by environment factors, and phase compensation voltage is generated and is injected into a dual-channel piezoelectric ceramic driver; a sine phase modulation signal is directly injected into the dual-channel piezoelectric ceramic driver to achieve sine modulation of a fringe phase, injected into the phase error compensation system to serve as a phase generation carrier and injected into a CCD time sequence controller to serve as a reference signal of the CCD time sequence controller, a time sequence generated by the CCD time sequence controller controls a planar array CCD camera to collect a fringe image on the surface of an object to be measured, the image is uploaded to an image processing and shape restoring system, and finally surface shape reconstruction of the object is achieved. The method meets the technical requirements for non-contact, full view, quickness, high precision and the like of multiple application fields.

The invention provides a fuzzy control method for wind power generation grid-connected running. The fuzzy control method comprises the following steps of firstly, building a wind power generation experiment system, wherein the wind power generation experiment system comprises two groups of wind power generators, two groups of AC/DC rectifiers, two groups of DC/DC converters and a public load, and the two groups of wind power generation devices are used for jointly providing electric energy for the load to use; secondly, building a mathematical model of the wind power generation experiment system according to a physical principle, wherein the mathematical model belongs to an interconnection system with two non-linear sub-systems; and finally, designing a distributed state feedback fuzzy controller based on the mathematical model, and giving out a simulation test platform of the system. With the distributed fuzzy control method provided by the invention, safe and stable running of a wind power generation network can be ensured.

The invention discloses a control method for a VIENNA rectifier of an aviation multi-electric engine. The control method comprises the following steps: establishing a stationary coordinate system of the VIENNA rectifier and obtaining a mathematical model under a two-phase rotating coordinate system by coordinate transformation; taking a DC side voltage as a control variable, and designing a sliding mode surface based on a global terminal sliding mode theory to design a voltage external loop controller; and taking the DC side voltage and a derivative thereof as input of fuzzy reasoning, and adjusting the sliding mode reaching law in real time according to the output sliding mode in a system state so as to control the DC side voltage. According to the control method disclosed by the invention, the robustness of the system can be improved by virtue of the global terminal sliding mode theory and an error is restrained to be zero within a definite time; the sliding mode reaching law is controlled in real time according to the experience of an expert by virtue of a fuzzy reasoning theory, so that not only is the quickness of system response improved, but also buffeting is effectively weakened.

The invention discloses a PET image reconstruction method based on non-local features and total variation joint constraint. The method comprises the following steps: establishing a mathematical modelof a reconstruction problem, adding the low-rank constraint based on non-local features and adding the total variation constraint to perform PET image reconstruction. The low-rank constraint filters noises in the structural information of an image according to the non-local similarity feature of the image. Meanwhile, the defect that a step effect exists in the total variation method is overcome. The total variation serves as a constraint for edge protection and noise reduction based on pixel points. At the same time, the defect that the edge of an image exists on the basis of an image block isovercome. The convergence speed is accelerated. Therefore, the constraint joint solving means is effectively utilized, and the defects of two methods are overcome. The problems that the result is lowin resolution and the noise interference is generated in the PET image reconstruction process can be further solved. Compared with an experiment of an existing reconstruction method, the reconstruction method disclosed by the invention has the advantage that a good reconstruction effect can be obtained.

The invention discloses a novel chaotic particle swarm optimization algorithm. The novel chaotic particle swarm optimization algorithm is combined with a particle swarm algorithm on the basis of a chaos ant colony algorithm to simulate the alternating movement process of chaos and stabilization of a particle swarm, the chaos movement and the movement of the particle swarm are combined together, and the degree of chaos is adjusted through chaos factors. According to the algorithm, the chaos is infused in the particle movement process, which is different from the simple particle sequence replacement of an existing chaos particle swarm algorithm, so that the particle swarm alternately gets close to the optimal point between chaos and stabilization, a new chaotic particle swarm mathematical model is provided, the premature convergence problem of the particle swarm optimization algorithm is effectively avoided, local optimum is broken through, and the computational accuracy and the global optimization capacity are improved greatly.

The invention discloses a firefly algorithm-based novel dot matrix structure obtaining method. The method comprises the following steps of s1: establishing a base structure of a dot matrix structure;and s2: establishing a mathematic model taking a section area of a bar unit in the base structure as a design variable, taking an axial force of a bar member as a constraint function and taking a minimum volume as an evaluation function, and obtaining an optimal dot matrix structure under a certain constraint condition by adopting a firefly algorithm. According to the method, a simulated molecularconfiguration is not adopted for manufacturing a porous material, and a base structure method is adopted as a topology generation method of a bar system structure to be combined with the firefly algorithm to finish structure topology optimization, so that a lightweight and high-strength dot matrix material is obtained.

The present invention relates to a method of controlling, by open-loop or closed-loop control, the processing of a liquid food product, comprising the steps of providing data that are obtained from mathematical modeling of the dependency of the viscosity of liquid food products on the shear rate, measuring the viscosity of the liquid food product to be processed at a predetermined shear rate at a measuring point, and controlling, by open-loop or closed-loop control, the processing of the liquid food product at a working device downstream of the measuring point in response to the viscosity measured at the measuring point and on the basis of the provided data.

The invention discloses a simulation method for a hot air drying process of a fungus material, and the method comprises the steps: building a physical model of a porous medium pore channel network ofthe fungus material according to the corresponding relation between the structural composition of the fungus material and the porous medium pore channel network structure; dispersing the fungus material medium calculation area into three parts, namely a skeleton, a pore node and a pore channel; simplifying the topological structure of the model according to the actual material related physical property characteristic parameters; establishing a pore channel network mathematical model for fungus material drying and mass transfer; establishing a fungus material drying heat transfer mathematical model based on a pore network; setting initial conditions and boundary conditions of mass transfer and initial conditions and boundary conditions of heat transfer; and solving the fungus material drying mass and heat transfer mathematical model established in the steps 4 and 5 by adopting a staggered grid. The method can comprehensively consider the heat and mass coupling complex transmission process of moisture between frameworks, between pore channels and between the frameworks and the pore channels in the drying process, and lays a foundation for analysis of the drying mechanism of high-heat-sensitivity and high-activity materials.

The invention discloses a method for quickly and safely overturning a large mold, and aims to provide an overturning method which is simple to operate and quick in overturning process. According to the technical scheme, the method comprises the steps that a mathematical model of a rectangular body surrounding a module is constructed with the help of CAE software, the gravity center position of a mold is found out, a calculated gravity center point A of the mold is vertically projected to the end face of one side in the length direction of the mold, and a projection point B is obtained; Respectively calculating two translation transfer starting points C and two translation starting points D on the end surface of one side of the mold at a quarter of the width size and a half of the height size of the mold; Lifting direction, Arbitrarily doing a point E, The corner angle of the right side edge of the mold serves as a supporting point of the mold contacting the ground when the mold is overturned clockwise, a right triangle is formed by perpendicularly connecting a point E with a ground plane of a gravity center projection point B of the mold, a point F is made at will in the same sidedirection of an overturning starting point E, and the height H1 of the right angle meets the requirement that the bottom edge is larger than or equal to 100 mm and smaller than or equal to 300 mm.

According to a quantitative analysis model and method based on the normalized surface-enhanced Raman scattering technology, a mathematical model is established by adopting an area normalized surface-enhanced Raman scattering spectrum and a linear principal component analysis method, the influence of absolute intensity fluctuation of the spectrum is effectively eliminated, and dimension reduction processing of quantitative information in the spectrum is realized. Therefore, quantitative analysis of a target system is realized by using the model.

The invention discloses a method for quickly generating a programmable logic control function block code, which comprises the following steps of: establishing a mathematical model, and compiling a corresponding performance function based on Simulink in Matlab software; creating the mathematical model into a subsystem, and then carrying out subsystem parameter configuration; carrying out system compatibility detection on the mathematical model, and building a simulation model of the controlled object on the basis of passing the detection; according to the simulation model, using simulation of Simulink to obtain an optimal solution of a control algorithm; according to a controlled object controller development environment, a programmable logic control function block code is generated from a control algorithm; and then the code is imported into a controller development environment of the controlled object, and software and hardware debugging is carried out until the actual requirements and functions of the controlled object are realized. According to the technical scheme provided by the invention, a reference can be provided for compiling a complex algorithm of the programmable logic controller based on a powerful computing power and a flexible programming mode of the Matlab, and the system design and debugging time is shortened.

A full-automatic wort oxygenated yeast adding machine and a wort oxygenated yeast adding method relate to the technical fields of multi-material mixing processes of biological engineering, fermentation engineering, biological pharmacy, fine chemical engineering and chemical engineering. The full-automatic wort oxygenated yeast adding machine comprises a stand, a PLC (Programmable Logic Controller) control cabinet and a Venturi tube, wherein the PLC control cabinet is arranged on the outer side of the upper end of the stand; the Venturi tube is arranged above the stand; and the full-automatic wort oxygenated yeast adding machine is externally connected with an air compressor, a cold wort inlet, a fermentation tank, a yeast propagating tank and a steam pressure reducing station. The wort oxygenated yeast adding method comprises the following steps of: introducing cold wort through the cold wort inlet; introducing air into the air compressor; introducing yeast into the yeast propagating tank; mixing the cold wort, the air and the yeast in the Venturi tube; after mixing enabling the mixture to enter the fermentation tank. The wort oxygenated yeast adding method disclosed by the invention is feasible; due to the application of an air quality flowmeter and a volumetric flowmeter, reliable preconditions for accurate addition of oxygen and yeast to the wort are provided; the establishment of a mathematical model method provides reliable reference for the accurate addition of the oxygen and the yeast to the wort; due to the application of an open-loop control principle, the phenomenon of feedback regulation lagging in a closed-loop control is avoided; and the automatic control over the whole process is realized, so that the labor intensity and the human error probability are greatly reduced and further the quality and the uniformity of products are greatly improved.

The invention relates to the technical field of power grid stability control, and particularly relates to a power grid stability control method suitable for an abnormal condition of an enterprise power grid. The power grid stability control logic is established according to the component fault tripping type, and the method comprises the following steps of S1, judging component fault tripping; S2, judging component fault tripping type; S3, determining various power parameters before and after fault tripping according to the fault tripping type determined in the S2; and S4, establishing a mathematical model for the power parameters obtained in the S3, and carrying out logic analysis, and realizing stable control under the abnormal condition of the power grid.

The invention relates to a method for calculating the temperature of a regenerative aluminum melting furnace molten pool. The method comprises the following steps of: S1, dividing the structure in thealuminum melting furnace into two parts, namely a combustion chamber and the molten pool, and respectively solving the two parts, wherein the combustion chamber part adopts steady state combustion tosolve a function of the heat flux density and the interface temperature of the interface of the molten pool and the combustion chamber, and establishing a mathematical model of the molten pool; S2, substituting the function of the heat flux density and the interface temperature of the interface of the molten pool and the combustion chamber as a boundary condition into a mathematical model of themolten pool; S3, setting the initial temperature of a molten pool aluminum material; S4, solving the mathematical model of the molten pool to obtain a function that the molten pool molten aluminum temperature changes along with heating time; and S5, correcting the function according to a measured value. According to the method, the calculation and evaluation process of the temperature of the molten aluminum can be simpler, more convenient and more efficient, the investment in computer resources and performance is reduced, and the method has certain guiding significance for engineering practice.

The invention provides a PET detector energy correction method and system and a computer readable storage medium, and the method comprises: building an energy response function model and building a correction coefficient lookup table, and carrying out the parameterization of a coefficient in a mathematical model through building a first lookup table and a second lookup table, enabling the coefficient to be transmitted to a PET detector front-end circuit, and achieving the correction of the energy response function model and the correction coefficient lookup table. The method is used for real-time table look-up correction of the PET detector, the correction precision is high, the efficiency is high, and the method is suitable for all PET detectors using SiPM as photoelectric conversion devices; and the method is suitable for linear and nonlinear PET detectors at the same time.

The invention discloses an electric energy meter structure and an error checking method for a user himself/herself. Establishing a mathematical model by using an electric energy conservation relationship of an electric energy system, and calculating an electric energy measurement error of the user electric energy metering module according to electric energy data detected by the user electric energy metering module, the auxiliary meter module and the error reference standard device of the three-way array structure; and compensating the newly measured electric energy data through the calculated error, continuously iteratively calculating the measurement error of the user electric energy metering module and the auxiliary meter module, and obtaining the user electric energy metering module without error or with equal error. According to the method provided by the invention, the multi-collinearity influence of electric energy data calculation caused by similar electric energy using habits of users can be weakened, and the calculation efficiency and the calculation precision are improved.

The invention discloses a statistical analysis method for determining sampling points of batch copper anode slime materials, which comprises the following steps: (1) dividing experiment batches, and setting the sampling points of an experiment, wherein the sampling amount of each sampling point is not less than 300g; respectively drying the samples to prepare an analysis sample, and analyzing thecontents of Au, Ag and H2O in the sample to obtain an analysis result; (2) establishing a point combination statistical analysis mathematical model; (3) calculating the coincidence rate of measurementaccording to the mathematical model established in the step (2); (4) finding out the actual sampling point number of the experiment with the coincidence rate meeting the condition; and (5) accordingto the found actual sampling point number of the experiment meeting the condition, calculating the actual sampling point number of the inspection batch. According to the method, the mathematical modelthat the measurement relative deviation determined by the point location combination is smaller than the analysis allowable difference to calculate the total receivable rate is creatively established, so that the determination of the number of sampling points in material detection has a theoretical basis, and the representativeness of sampling is ensured.