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78 results about "Particle position" patented technology

Control parameter optimization method and system for intelligent valve positioner

The invention relates to the technical field of data processing, in particular to a control parameter optimizing method and system for an intelligent valve positioner. The method comprises the steps of obtaining a valve position actual feedback value; initializing a particle swarm optimization algorithm, and in each iteration of the particle swarm optimization algorithm, calculating a control performance fluctuation degree based on a valve position set value and an actual feedback value, determining a population evolution state factor by combining an average fitness change of current and historical iterations, and adaptively adjusting an inertia weight according to the population evolution state factor; updating the speed and the position of the particle by using a self-adaptive inertia weight; and after a termination condition is met, outputting an optimal particle position as a PID control parameter combination so as to realize the optimization method of the control parameters of the intelligent valve positioner. According to the method, through real-time dynamic adjustment of the inertia weight, the problem that a traditional static weight strategy is easy to converge too early or oscillation is not convergent under the condition change is solved, and the efficiency and accuracy of parameter optimization are improved.
Owner:WUHAN TORLEO INTELLIGENT CO LTD

Security constraint type inverse kinematics solving method and device and storage medium

The invention discloses a security constraint type inverse kinematics solving method and device and a storage medium. The method comprises the following steps: firstly, forming a joint angle-tail end pose pairing data set by students through forward movement of a robot; training an improved RBF (Radial Basis Function) network by using the data set to establish initial mapping from a tail end pose to a joint angle to obtain an initial approximation model; taking the prediction output of the model as an initial population of a PSO algorithm, and updating the speed and position of particles in the initial population through iteration; designing a comprehensive cost function, introducing a joint angle constraint and an obstacle collision constraint, and evaluating the advantages and disadvantages of each particle; and when the PSO algorithm reaches the maximum number of iterations or the comprehensive cost function value is lower than a set threshold value, outputting a global optimal particle position as a final inverse kinematics solution. On the premise of ensuring the solving precision, the joint limit constraint and the obstacle avoidance constraint are explicitly processed, so that an accurate, safe and feasible inverse solution is output, and the reliability and the safety of robot operation are remarkably improved.
Owner:JIANGSU UNIV OF TECH

Coal rock seepage-stress coupling simulation calculation method

The invention discloses a coal rock seepage-stress coupling simulation calculation method, which belongs to the technical field of geotechnical engineering numerical simulation, and comprises the following steps: carrying out gray threshold division on a coal rock sample CT scanning result to obtain a coal rock CT section; identifying particle position information in a coal rock CT section, and establishing a coal rock refined discrete element model; performing mechanical constitutive parameter calibration on the coal rock refined discrete element model; and on the basis of the coal rock refined discrete element model subjected to constitutive parameter calibration, establishing a fluid grid, setting model parameters, and carrying out seepage-stress coupling calculation. According to the method, the real form, size, spatial distribution and mutual inlaying relation of the mineral components in the coal rock can be accurately captured, and the most real basis is provided for accurate simulation of subsequent mechanical behaviors.
Owner:SICHUAN UNIV

Dynamic optimization method based on particle swarm optimization algorithm

The invention discloses a dynamic optimization method based on a particle swarm optimization algorithm, and relates to the technical field of intelligent optimization algorithms, and the method comprises the steps: initializing the particle swarm optimization algorithm; calculating a target vector value of each particle in the particle swarm, executing Pareto comparison, screening the first 15% of particles as elite particles, and updating the particle swarm to join in optimization; adopting Alpha-Stable distribution to generate random disturbance, and executing dynamic mutation operation on particle positions; maintaining and updating the external archive storing the non-dominated solution; s4, performing quantitative evaluation on the current iteration state of the algorithm based on a preset convergence judgment criterion, and if the convergence condition is not met, returning to S3 and S4 to perform loop execution until the convergence condition is met, and terminating the iteration process; according to the method, aiming at the performance defects of the particle swarm, the optimization performance of the algorithm is pertinently improved in different stages through a dynamic variation mode, and a feasible solution is provided for the dynamic variation of the particle swarm algorithm.
Owner:XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA

Cross-hardware cooperative operator optimization method and system based on particle swarm optimization

The invention discloses a cross-hardware cooperative operator optimization method and system based on a particle swarm algorithm, and relates to the technical field of operator optimization. Aiming at the technical bottleneck existing in the current cross-hardware platform cooperation scheme, the method comprises the following steps: S1, configuring an operator adaptation rule according to hardware characteristics; s2, coding the operator-hardware allocation scheme into a particle position vector based on an operator adaptation rule; s3, collecting real-time performance data of the hardware; designing a fitness function including hardware throughput, hardware calculation delay and hardware utilization rate, and realizing collaborative optimization of the three by minimizing the function value; and S4, taking the particle position vector coded in the S2 as an optimization object, taking the fitness function value designed in the S3 as an evaluation standard, continuously adjusting a hardware allocation result of each operator in the vector through iterative updating of the particle swarm algorithm, finally finding a position vector with the minimum fitness value, and correspondingly outputting an optimal operator-hardware allocation scheme. The method is suitable for a computing cluster formed by heterogeneous hardware groups.
Owner:YUANQIXIN (SHANDONG) SEMICONDUCTOR TECHNOLOGY CO LTD

A method for multi-dimensional evaluation and anchor point constraint scoring of particle shape

The application discloses a kind of multi-dimensional evaluation and anchor point constraint scoring method of particle shape, belong to the technical field of particle shape analysis.The method includes: obtaining the three-dimensional grid model of particle sample and pre-processing;Extract the multi-dimensional shape features including corner angle, sphericity, size, symmetry, texture and taper;Filter key features by multi-model voting;Group key features according to preset dimension and carry out adaptive dimension reduction, construct multi-dimensional evaluation space;Determine anchor point sample set for each evaluation axis, construct two-classification sub-problems for the evaluation axis containing intermediate anchor point, determine initial scoring parameter using seven-model performance weighted integration;Based on the score relationship of low-end, intermediate and high-end anchor points, the initial parameter is corrected by ridge regression, and the final scoring parameter is obtained by sequential monotonicity check;Based on the final scoring parameter, the multi-dimensional score of the particle to be scored is carried out and the result is output.The application realizes the multi-dimensional automatic evaluation of particle shape, has the advantages of feature selection objectivity, weight distribution accuracy, intermediate morphological particle position rationality, dimension reduction method adaptivity, visualization richness and the like.
Owner:XIANGTAN UNIV

A particle cutout method and related apparatus

The application discloses a particle screenshot method and related equipment, the method comprises the following steps: acquiring a particle image to be processed, and cutting a field of view region from the particle image based on a preset frame selection range; performing integral projection on the field of view region to obtain a one-dimensional sequence group; performing weighted standardization on the initial one-dimensional sequence based on the field of view size of the field of view region in the projection direction to obtain a weighted one-dimensional sequence; performing smoothing processing on the weighted one-dimensional sequence to obtain a smoothed one-dimensional sequence; performing local peak marking based on the smoothed one-dimensional sequence to obtain a local peak position; converting the local peak positions corresponding to two projection directions of the horizontal direction and the vertical direction to obtain a particle position; and cutting a particle screenshot of a target particle from the field of view region based on the particle position. By introducing the weighted standardization link based on the field of view size, and combining the bidirectional integral projection, sequence smoothing and local peak detection, the particle positioning and screenshot can be efficiently and accurately realized. The application can be widely applied in the field of image processing technology.
Owner:GUANGZHOU NAT LAB

Numerical simulation method for soil erosion caused by rainfall

The invention discloses a numerical simulation method for soil erosion caused by rainfall. The method comprises the following steps: establishing a numerical model and boundary conditions of a simulation area; modeling a soil particle system by adopting a discrete element method; modeling a wind and fluid-solid interaction system by adopting computational fluid dynamics; modeling rainfall by adopting a discrete element method; performing CFD-DEM coupling solution and erosion process simulation, calculating movement of all soil particles and raindrops under related acting force in each time step, and updating positions and speeds of the movement; according to the updated particle positions, the porosity in each CFD grid unit is calculated; based on the relative velocity of the particles and the fluid; fluid acting force borne by each particle is calculated and aggregated into a source item in a CFD grid unit; substituting the calculated porosity and the source item into the model, and solving the updated fluid velocity field and pressure field; key interaction judgment and implementation are carried out; iteratively circulating until the set total simulation time is reached; and outputting related data of the soil particles in the simulation process.
Owner:SHANDONG UNIV

Bridge scour simulation and boundary setting method for SPH water-sand two-phase flow

The application discloses a bridge scour simulation and boundary setting method for SPH water-sand two-phase flow, and comprises the following steps: model construction, including setting a bed sand layer area range and defining an inlet and outlet boundary area range; particle construction, including setting fluid particles and bed sand particles of a flow field area based on a multiphase flow theory, setting soil yield strength based on a HBP model and introducing a DP yield criterion, initializing inlet and outlet boundary particle parameters, setting particle type identification, and setting particle position identification; N-S control equation solving, obtaining corresponding flow force parameter results; entering a sediment solving module, including sediment particle conversion and viscosity updating calculation; entering an inlet and outlet boundary updating module, including inlet and outlet particle position retrieval, particle type conversion, and particle supplement and deletion; completing a calculation cycle and entering the next cycle; through secondary development based on the SPH multiphase flow theory, the application can realize numerical simulation of foundation local scour by applying the inlet and outlet boundaries to the multiphase flow model and introducing various structure and state models.
Owner:SOUTHEAST UNIV

Particle screenshot method and related equipment

The invention discloses a particle screenshot method and related equipment, and the method comprises the steps: obtaining a to-be-processed particle image, intercepting a visual field region from the particle image based on a preset frame selection range, carrying out the integral projection of the visual field region, and obtaining a one-dimensional sequence group; performing weighted standardization on the initial one-dimensional sequence based on the view size of the view area in the projection direction to obtain a weighted one-dimensional sequence; smoothing the weighted one-dimensional sequence to obtain a smooth one-dimensional sequence; performing local peak marking based on the smooth one-dimensional sequence to obtain a local peak position; according to the local peak positions corresponding to the transverse and longitudinal projection directions, particle positions are obtained through conversion; and capturing a particle screenshot of the target particle from the view area based on the particle position. The particle positioning and screenshot can be efficiently and accurately realized by introducing a weighting standardization link based on the view size and combining the bidirectional integral projection, the sequence smoothing and the local peak detection. The method can be widely applied to the technical field of image processing.
Owner:GUANGZHOU NAT LAB

A non-destructive characterization method for explosive small component particle migration distribution based on mu CT

The application provides a nondestructive characterization method of explosive small component particle migration distribution based on mu CT, and the method comprises the following steps: step one, establishing a coordinate system for describing the position of component particles; step two, determining the position of a single particle; step three, describing the position of the single particle in different states; and step four, constructing a migration distribution characterization model. The method of the application establishes a position description system of explosive component particles by taking mu CT as a technical means, determines a single particle position description method, and constructs a component migration distribution characterization model by describing the position of different components and different particles under different conditions, so that the migration distribution change of explosive grain internal small component particles is nondestructively and finely characterized, and a foundation is laid for migration mechanism research.
Owner:XIAN MODERN CHEM RES INST

Intelligent pipeline detector based on positron emission particle tracer technology and detection method

The invention relates to an intelligent pipeline detector based on a positron emission particle tracer technology and a detection method, and the pipeline detector comprises a tracer particle putting module which is used for quantitatively putting tracer particles into a pipeline; the positron camera module is used for collecting positron pair annihilation events released by the tracer particles in a preset time window and generating multiple pieces of coincidence response line data; the tracer particle positioning module is used for calculating a midpoint between the data conforming to the response line, performing weighted aggregation to obtain an approximate intersection point set, and performing weighted clustering processing on the approximate intersection point set to obtain a final estimated position of the tracer particle; and the pipeline state visualization module is used for performing line connection according to the final estimated positions of the tracer particles to form a track curve of each tracer particle, comparing the track curve with the pipeline boundary image, identifying an abnormal area and performing visual display. According to the invention, the corrosion wear or deposition in the pipeline is visualized, and the corrosion wear or deposition degree is accurately measured.
Owner:KUNMING UNIV OF SCI & TECH

A multi-layer learning-assisted multi-objective fuzzy flexible job shop scheduling method

This invention discloses a multi-objective fuzzy flexible job shop scheduling method with multi-layer learning assistance, relating to the field of job shop scheduling technology. The method includes the following steps: constructing and initializing two populations to generate particles; constructing an external shared archive; building a queue for each particle; calculating the position fitness of the particles; enqueuing the particle positions into the queues; and selecting the position of the particle with the best dominant fitness in each population and assigning it the value gBest. q Update the external shared archive; select the position with the best dominant fitness in each particle queue, denoted as spBest. p q The particle position and velocity are updated using a multi-layer learning strategy; crossover and mutation operations are performed on the population to complete the population update; the updated positions are enqueued into the queue; and gBest is updated. q ; Simulated annealing method for gBest q Apply perturbations; update the external shared archive. Repeat the iteration until completion. This ultimately improves the exploration efficiency and convergence speed of multi-objective Pareto fronts.
Owner:GUANGZHOU INSTITUTE OF TECHNOLOY XIDIAN UNIVERSITY

Mobile device path planning method and electronic device

The application discloses a mobile device path planning method and an electronic device. The mobile device path planning method comprises the following steps: constructing a fitness function of mobile device path planning; initializing a particle swarm population, and a particle position is used for encoding a candidate path composed of multiple intermediate path point coordinates; performing multiple iterations of optimization, in each iteration, after each velocity and position update is completed, performing a dimension-by-dimension optimization operation on the entire population, the dimension-by-dimension optimization operation searches the path point coordinates of the candidate path encoded by all particle positions in the population dimension by dimension, and optimizes the corresponding path point coordinates in the global optimal position; after the iterations are completed, determining an optimal path based on the path encoded by the global optimal position. The application overcomes the defect that the effective local feature is lost due to simple elimination of low fitness particles in the existing PSO algorithm; meanwhile, repeated calculation of full path evaluation is avoided, and the real-time performance and high efficiency of algorithm operation are ensured while the optimization precision is effectively improved.
Owner:DALIAN UNIV OF TECH

Method for determining component ratio of two-way memory alloy based on QPSO (Quadrature Particle Swarm Optimization) algorithm

The invention discloses a QPSO (Quadrature Particle Swarm Optimization) algorithm-based method for determining a two-way memory alloy component ratio, which belongs to the field of memory alloy ratios and is used for determining the memory alloy component ratio and accurately regulating and controlling the temperature sensitivity and elongation error of a material so as to enable a spring to keep stable deformation performance in repeated thermal cycles and prolong the service life of a device. The method mainly comprises the following steps: determining a multi-target fitness function according to a two-way shape memory effect alloy element; the optimized parameter is the proportion of each element, a four-dimensional solution space is formed, a random particle population is generated, the number of particles is N, and the maximum number of iterations is stipulated as S; evaluating a fitness value of each particle based on a fitness function; updating particle positions; and calculating the fitness value of each particle at the new position, and updating the individual optimal position Pb of the particle and the global optimal position Gb of the particle swarm. The method is mainly used for matching the components of the two-way memory alloy.
Owner:临沂临工智能信息科技有限公司

A vision-based method and system for detecting and compensating wafer particle position offset

PendingCN122094472AEliminate the effects ofImprove spatial dimension integrityImage analysisUsing optical meansVision basedEngineering
This invention provides a vision-based method and system for detecting and compensating wafer particle position offset. It generates an initial imaging data set containing the surface microstructure by performing dual-view synchronous imaging on the wafer surface. Parallax matching and feature segmentation are then performed on the initial imaging data set to generate three-dimensional height information and an initial set of particle coordinates on the wafer surface. Based on the initial particle coordinate set and the charge distribution characteristics of the wafer surface, particle displacement is predicted and corrected, generating displacement compensation feature quantities for each particle. The fine-tuning optical system of the wafer inspection machine is invoked to perform optical correction on the displacement compensation feature quantities, generating corrected real-time imaging data. Coordinate registration is performed on the real-time imaging data to generate the final set of wafer particle position coordinates. This invention can improve the spatial dimensional integrity of wafer particle position detection, the comprehensiveness of multi-factor displacement prediction, and the actual physical accuracy of the detection results.
Owner:GUANGDONG CHENGLITAI TECH CO LTD

Ambiguity resolving method for hybrid differential evolution and improved particle swarm optimization

The invention provides an ambiguity resolving method for hybrid differential evolution and improved particle swarm optimization. And determining various parameters of the algorithm according to the ambiguity resolving space range determined by the floating point solution. And the global search capability of the particles is enhanced according to the set inertia weight, so that local optimum is avoided. In order to solve the problem of population homogenization in the later stage of the particle swarm optimization algorithm, a variation-crossover-selection mechanism of differential evolution is integrated, and particle positions are optimized. And adjusting particle positions according to a particle swarm optimization algorithm position updating formula to obtain a new candidate ambiguity solution. And through boundary processing and calculation of weighted least square cost of each particle position, individual optimum and global optimum are updated. And when the number of iterations reaches a set threshold value, outputting global optimum. Compared with a traditional particle swarm optimization algorithm, the method has the advantages that local optimum is avoided, the convergence speed is increased, and the method is more suitable for fast and reliable ambiguity fixing requirements in GNSS high-precision positioning.
Owner:GUILIN UNIV OF ELECTRONIC TECH +1

A method and device for dynamic scheduling of parking spaces using a multi-strategy adaptive particle swarm

PendingCN122288240ALocal optimumSimulation
This application discloses a multi-strategy adaptive particle swarm optimization method and apparatus for dynamic parking space scheduling, belonging to the field of parking space scheduling technology. The method includes: cleaning flight and parking space data to construct a flight-parking space compatibility matrix; mapping particle positions using continuous real-number encoding and initializing the population through an OBL (Optimal Boundary Learning) strategy; adaptively adjusting the inertia weight AIW based on population diversity and combining it with a random migration RI (Increase in Randomization) strategy to avoid local optima; applying boundary constraints and conflict resolution to particle positions, and using a DA (Data Determination) mechanism based on congestion distance to preserve non-dominated solutions; and outputting the optimal parking space scheduling scheme through multi-attribute decision-making after the iteration meets the termination condition. This application improves the algorithm's convergence speed and global optimization capability through multi-strategy collaborative optimization, reduces the proportion of infeasible solutions, increases parking space utilization and flight docking rate, and balances passenger travel experience with airport operational efficiency.
Owner:CIVIL AVIATION UNIV OF CHINA

Pfc system real-time energy efficiency optimization method and system based on dynamic weight particle swarm algorithm

The application discloses a kind of PFC system real-time energy efficiency optimization method and system based on dynamic weight particle swarm algorithm, comprising: first, the multidimensional parameter search space of PFC system is constructed, and system operating state parameter is collected in real time. Then, initialize particle swarm population, and iteration optimization is carried out using dynamic weight particle swarm algorithm. Algorithm is updated particle position and speed by dynamically adjusting inertia weight, combining particle own historical optimum and population global optimum information, and finally finds global optimum energy efficiency parameter combination. Finally, according to the combination generation control instruction and issue to each execution unit of PFC system, realize the real-time adjustment of parameter and the closed-loop optimization of system energy efficiency. The application effectively improves the optimization speed and global optimization ability, and guarantees the efficient and stable operation of PFC system.
Owner:HUNAN FENGYA ELECTRONICS CO LTD

Systems and methods for analysis of microporous annealed particle scaffolds

Technologies for particle scaffold analysis include a computing device that obtains labeled input data indicative of particles positioned in a scaffold domain. The input data may be generated by an imaging system coupled to the computing device or may be generated by simulating a physical system. The computing device determines a cumulative Euclidean distance transform (EDT) for each voxel of void space of the scaffold domain, and determines multiple medial axis landmarks based on the EDT and on a particle configuration. The particle configuration is indicative of a neighboring particle graph. The computing device segments the void space into multiple subunits based on the medial axis landmarks. The computing device may determine multiple scaffold descriptors based on the subunits. Other embodiments are described and claimed.
Owner:DUKE UNIV

A method and system for designing a multi-satellite per rocket layout based on separation safety

ActiveCN117634024BClassical mechanicsField separation
The application relates to a one-rocket multi-satellite layout method and system based on separation safety design, which comprises the following steps: obtaining an in-orbit attitude deviation at a satellite-rocket separation time, setting an initial separation state; setting mass center coordinates of M groups of satellites relative to a rocket body and separation energy of each satellite in the initial separation state, and completing population initialization; establishing a fitness function by taking the minimum far-field distance of two satellites within half a period to five periods after separation and the total attitude angular velocity of each satellite after separation as optimization indexes; calculating a fitness function value of each particle; updating individual extreme values and global extreme values; updating particle speed and particle position; and outputting one-rocket multi-satellite layout optimization results when a preset ending condition is met. The application solves the layout problem caused by coupling of structure layout and far-field separation with the increase of the number of separation bodies in one-rocket multi-satellite tasks, and provides guidance for structure layout by considering far-field safety in the initial structure layout, so that the structure overall design efficiency is improved.
Owner:BEIJING INST OF ASTRONAUTICAL SYST ENG

A GPU fluid simulation method for real-time interactive applications

The application provides a GPU fluid simulation method for real-time interactive application, and relates to the technical field of fluid simulation. The method first uses a particle system to emit a large number of particles, calculates fluid particle positions using a position-based fluid particle simulation algorithm, updates the motion state of the particles, then obtains a smooth fluid surface according to the particle positions through screen space processing, and finally uses a realistic rendering method to color the fluid surface to obtain a water body image. Since the state update of the large number of particles and the pixel-level calculation of the screen space are both large-scale parallel calculations, they are suitable for GPU processing, so all the calculation processes involved in the method are run on the GPU end. The method can be widely applied to various demand scenarios in the fields of industrial simulation and electronic games.
Owner:NORTHEASTERN UNIV CHINA

A subassembly for a particle detector, a particle detector and an imaging system comprising said subassembly and / or detector

The present invention belongs to the field of particle position and energy detectors, preferably proton tracking detectors and residual range detectors in proton imaging systems. The object of the invention relates to a subassembly for a detector for detecting particles, preferably protons, and a detector comprising at least one subassembly. The invention further relates to an imaging system comprising said subassembly and / or detector. The subassembly consists of one layer of scintillating fibers, wherein each fiber within the layer is at least at one end provided with one photon detector, preferably a SiPM. Since each fiber of the subassembly is provided with its own photon detector, there is no need to form fiber bundles and combine them into separate channels for photon detection, which was a significant disadvantage of the currently known solutions.
Owner:UNIVERSITY OF LJUBLJANA

Quantum phase estimation method and device, terminal equipment and storage medium

The invention discloses a quantum phase estimation method and device, terminal equipment and a storage medium, and relates to the field of quantum computation.The method comprises the steps that the quantum state of a to-be-estimated phase is obtained, an initial particle swarm is constructed through a scheme decision model, and the particle position is used for representing a phase estimation scheme; the phase estimation process is repeatedly executed to obtain a target phase estimation scheme, and then phase estimation is carried out on the quantum state, including the steps of calculating strategy dispersion according to the current particle position, and if convergence occurs, determining the target phase estimation scheme according to the global optimal position; otherwise, updating the particle position and the particle speed; determining a strategy vector of each particle according to the current particle speed, the current adjustment parameter and all historical positions of the particles; and correcting the particle speed and adjusting parameters according to the strategy vector. Through the implementation of the invention, the problem of low phase estimation precision caused by assuming an ideal noiseless condition in the existing quantum phase estimation can be solved, and the estimation precision in an actual noise environment is improved.
Owner:MEASUREMENT CENT OF GUANGDONG POWER GRID CO LTD

Low earth orbit satellite high dynamic tracking method and system

This invention discloses a high-dynamic tracking method and system for low-Earth orbit satellites. The method is as follows: Step 1: Obtain the two-line orbital element number TLE of the satellite, and calculate the theoretical position and angular velocity of the satellite at the current moment using the orbital propagation model, as a priori guidance for antenna pointing; Step 2: Construct a particle swarm in a two-dimensional search space, where each particle represents a possible antenna pointing angle; Step 3: Collect the received signal strength (RSSI) corresponding to the positions of multiple particles in the particle swarm, and fit the current signal strength gradient vector using the least squares method based on the geometric differences in the spatial distribution of particles; Step 4: Calculate the position of each particle at the next moment according to the generalized velocity update equation, which includes three driving forces: swarm intelligence term, cooperative gradient term, and orbital feedforward term; Step 5: Convert the updated optimal swarm position into a servo control command to drive the antenna rotation.
Owner:HANGZHOU DIANZI UNIV

Liquid film oscillation mechanism and fluctuation stability calculation method and device based on particle method

The invention provides a liquid film oscillation mechanism and fluctuation stability calculation method and device based on a particle method. The method provided by the invention comprises the following steps: firstly, constructing a calculation model by arranging five types of particles, namely, sole, fluid, wall, dummy and ghost; secondly, applying a net heat flow boundary considering wall enthalpy correction, radiation heat dissipation and a gas injection factor based on a virtual particle method to realize heat transfer and phase change calculation; then solving a viscosity item and a shear force by adopting a fully implicit method, and updating a particle motion state by combining a non-Newton flow power law model; then, a potent model is introduced to calculate surface tension and overload influence; solving a pressure field through a pressure Poisson equation and iteratively updating particle positions; and finally, dynamically marking ghost particles at the outlet to optimize the calculation efficiency. According to the method, the oscillation phenomenon of the liquid film can be accurately simulated, the generation mechanism and stability influence factors of the liquid film can be revealed, theoretical support and technical means are provided for thermal protection design of the silicon-based material, and the technical problem that the three-dimensional dynamic ablation morphology cannot be analyzed through a traditional method is solved.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS

Metal structure parameter prediction method and system based on ultrasonic positioning and particle swarm optimization

The invention belongs to the field of metal structure nondestructive testing and parameter identification, and relates to a metal structure parameter prediction method and system based on ultrasonic positioning and particle swarm optimization. The method comprises the following steps: firstly, selecting a transducer and determining excitation parameters; exciting and receiving a guided wave signal on the surface of the metal structure by using a transducer, and collecting original data containing frequency dispersion information; setting a parameter range to generate a frequency dispersion curve; encoding parameters such as elasticity modulus and plate thickness to be predicted into particle position vectors, constructing a fitness function, searching an optimal parameter combination through a speed-position iterative formula of a particle swarm algorithm, outputting a prediction result after ultrasonic positioning, fitness estimation and multiple iterations, and verifying and correcting if an error exceeds a range. According to the system and the method, on the premise that the integrity of the metal structure is not damaged, key mechanical and geometric parameters of the metal structure can be efficiently obtained, efficient and accurate prediction of parameters such as the elastic modulus and the plate thickness of the metal structure is achieved, and diversified detection requirements of different industries are met.
Owner:OCEAN UNIV OF CHINA

Order sorting and scheduling method and device and storage medium

The embodiment of the invention discloses an order sorting scheduling method and device and a storage medium, and the method comprises the steps: carrying out the parameter setting based on a sorting line and the number of orders, setting the maximum number of iterations, the population scale, the re-initialization rate and the size of each sub-population of a particle swarm optimization algorithm, and defining the change strategy of a dynamic inertia weight and a learning factor; generating a part of initial particles by using a K-means method, and carrying out random disturbance on a K-means generation result to initialize particles of other parts; for each particle, obtaining the fitness of the particle under the current solution, and updating the optimal position and the global optimal position of each particle; when the number of iterations is greater than a first preset number of iterations, performing simulated annealing search on the globally optimal solution; the inertia weight and the learning factor are dynamically adjusted according to the current iteration frequency, the speed and the position of the particle are updated, and the position of the particle is corrected; and re-initializing part of particles at every second preset number of iterations.
Owner:HONGHEZHOU BRANCH OF YUNNAN TOBACCO

Material particle positioning detection method and system based on Fourier dominant frequency phase inversion

The invention discloses a material particle positioning detection method and system based on Fourier dominant frequency phase inversion. The method comprises the following steps: S1, collecting a plurality of voltage signals of a plurality of induction coils through an electromagnetic induction device; s2, preprocessing the complex voltage signal of each coil, and extracting the phase of a dominant frequency component through fast Fourier transform; s3, directly extracting an absolute phase from the spectrum by using the global continuity characteristic of the dominant frequency component of the Fourier spectrum; s4, constructing a bidirectional neural network model, training based on the absolute phase data set, and establishing a mapping relation between the phase and the three-dimensional coordinates of the particles; s5, inputting the absolute phase value of each induction coil into the trained reverse neural network model to output the three-dimensional space coordinate position of the particle; according to the method, the problems of insufficient phase information utilization, difficult phase jump processing and high calculation complexity are solved, and high-precision, high-efficiency and high-real-time material internal particle positioning detection is realized.
Owner:南宁桂电电子科技研究院有限公司