75 results about "Conditional simulation" patented technology

The invention discloses a three-dimensional finite element simulation method for a complex slope excavation unloading process, which comprises the following steps of: 1) constructing a three-dimensional model of a complex slope, and establishing a finite element grid; 2) inputting boundary conditions of the model and material parameter information of each stratum; 3) calculating and simulating an initial stress field of the slope before excavation; (4) according to the initial stress field, the unloading load of the slope excavation part is calculated; (5) finite element calculation is conducted on stress deformation of the excavated slope; according to the method, the high-precision three-dimensional finite element model is established, various material parameters and actual boundary conditions are combined, the stress change and the unloading effect of the slope in the excavation process are simulated, the stress redistribution in the unloading process is accurately reproduced, the prediction precision of local instability and stress concentration areas is improved, and the prediction accuracy of the slope is improved. Therefore, a scientific basis is provided for safety assessment of slope excavation.

The invention relates to the technical field of pipeline safety detection, in particular to a pipeline hydrogen-doped leakage real-time monitoring and early warning method and system based on Fluent simulation, and the method comprises the steps: obtaining leakage diffusion data of gas in a pipeline detected by multiple sensors, and carrying out the preprocessing of the data; extracting data features: carrying out conjoint analysis on a time-frequency domain to obtain a time-frequency matrix; by calculating mutual information evaluation correlation of different sensor data, feature statistical correlation is realized, and features with non-significant spatial correlation are removed; the pressure data, the flow data and the concentration data are subjected to sub-channel filtering and fusion processing based on federated Kalman filtering (FKF); establishing a pipeline model based on Fluent, and simulating a pipeline hydrogen-doped leakage process by taking the extracted features as input conditions; a risk model is constructed based on real-time sensor data, simulation prediction data and environmental parameters, and a hierarchical early warning mechanism is established. Through cooperative monitoring of multiple sensors, leakage characteristic data can be accurately captured, and safety and reliability of the system are ensured.

The invention discloses a pile foundation scouring simulation method and device based on a coupling model and electronic equipment, and the method comprises the steps: constructing a hydrodynamic model covering an offshore wind plant area, and obtaining a computational fluid mechanics model; according to the computational fluid mechanics model and the hydrodynamic model, a coupling model of a single pile foundation area is constructed; obtaining an inlet boundary condition and an outlet boundary condition of the computational fluid mechanics model; and according to the coupling model, the inlet boundary condition and the outlet boundary condition, pile foundation group scouring is simulated, and a target simulation result is obtained. The method can improve the effectiveness and accuracy of pile foundation scouring simulation, and can be widely applied to the technical field of ocean engineering.

The invention provides a multi-scale simulation method for high-fidelity selective laser melting forming and phase field-lattice Boltzmann coupling, and belongs to the technical field of selective laser melting numerical simulation. The method comprises the specific steps that a selective laser melting powder laying process model is constructed based on a discrete element method, and a randomly stacked powder bed model is obtained; a high-fidelity selective laser melting forming thermal fluid dynamic model is established, and macroscopic temperature distribution and flow field distribution of a molten pool are simulated; establishing a phase field model-lattice Boltzmann coupling model; and extracting temperature gradient, solidification velocity and melt flow velocity data of local positions of the boundary of the steady-state molten pool, and simulating solidification structure evolution under flowing of molten metal in the molten pool by taking the data as initial conditions of the phase field-lattice Boltzmann coupling model. According to the method, through high-fidelity multi-scale simulation, the relation between the process parameters and the microstructure is established more comprehensively, and reliable numerical support is provided for selective laser melting process optimization and microstructure prediction.

The invention discloses a rock blasting load transfer and throwing simulation method which comprises the following steps: S1, acquiring field parameters of a target blasting project, the field parameters comprising rock mass mechanical parameters, explosive parameters, blast hole parameters and charging structure parameters; and S2, based on the field parameters, constructing a three-dimensional explosive-rock calculation model by adopting pretreatment software, dividing grids, importing the grids into finite element software, setting a material model, a state equation and boundary conditions, and simulating an explosive detonation process. The limitation of a single numerical value method is solved; quantitative analysis and accurate prediction of rock blasting lumpiness are achieved, inclined joints are adopted in the discretization process, actual rock mass joint distribution is better fitted, and the reliability of a simulation result is improved; bulk rocks and excessive crushing phenomena are effectively reduced, the explosion energy utilization rate is improved, the engineering cost is reduced, and a scientific basis is provided for explosion design of projects such as mining and water conservancy and hydropower.

The invention relates to an electric power engineering wind speed optimization method and system based on fluid mechanics simulation software. The method comprises the specific steps that a three-dimensional terrain model of a target area is established based on the fluid mechanics simulation software; historical meteorological data of a target area are collected through geographic information software, boundary conditions are set according to the historical meteorological data, and wind field distribution under different weather systems is simulated; extracting characteristic parameters of each micro-terrain along the power transmission line corridor in the target area, wherein the characteristic parameters comprise terrain gradient, relative height difference and surface roughness classification; calculating a wind speed correction coefficient of each microtopography through a gray model based on the boundary conditions and the characteristic parameters of each microtopography; and finally, performing iterative verification on the corrected wind speed through a Monte Carlo method, and outputting a wind speed result meeting a preset confidence coefficient requirement as a final optimized wind speed.

The invention discloses a forest fire monitoring method based on a low earth orbit satellite, and the method comprises the steps: obtaining data through multiple sensors, and carrying out the denoising and smoothing processing, and generating a fusion data set; a convolutional neural network is combined with multi-scale analysis to enhance fire point features, and a feature set is formed. And matching the multi-satellite collaborative observation data with the feature set, and generating a high-frequency observation enhanced data set through time sequence alignment. A deep learning and transfer learning optimization model is adopted, key area features are extracted, multi-satellite data are shared through distributed calculation, and a coverage enhancement data set is obtained. And dynamically adjusting a multi-satellite scheduling strategy based on the timeliness evaluation model, and outputting a scheduling result. The robustness of an algorithm is optimized through reinforcement learning, a robustness enhancement model is obtained in combination with complex meteorological condition simulation, the data fusion precision is verified by using a multi-source data verification technology, and a final monitoring result is output. According to the method, the accuracy, timeliness and coverage integrity of fire point detection are remarkably improved.

Systems and methods for view-conditioned diffusion for real-world vehicle gaussian splatting. A single perspective image can be transformed using image transformation techniques to generate a training dataset that addresses a domain gap between synthetic data and real-world data in a traffic scene. A pre-trained diffusion model can be finetuned with the training dataset to obtain a fine-tuned diffusion model. Perspective-aware images having different perspective views of an entity from the single perspective image can be generated using the fine-tuned diffusion model. A large generative model (LGM) can be trained using the perspective-aware images to generate a gaussian splatting model for the entity. View-conditioned simulations from the single perspective image can be generated by using the gaussian splatting model for downstream tasks.

The invention discloses a control method for optimizing a solid / liquid interface of a solution in indium Czochralski purification based on numerical simulation, belongs to the technical field of preparation of high-purity metal materials, and obtains a process regulation and control scheme for stabilizing the solid / liquid interface of the solution through an external magnetic field and establishment of a mapping relation of process parameters-interface data-impurity concentration based on multi-physics field numerical simulation. The method comprises the following steps: acquiring original physical property data of the czochralski furnace and indium, calculating a geometric model, performing mesh generation, and establishing a mathematical model; based on historical experimental data, boundary conditions are set, and the key processes of indium czochralski purification seeding, shouldering and equal diameter are simulated; coupling multiple physical fields, and analyzing the change of a solid / liquid interface of the solution in the direct pulling process; and on the basis of a numerical simulation result, a deep reinforcement learning model is constructed, a mapping relation among process parameters, interface data and impurity concentration is established, 'prediction-verification-optimization 'closed-loop iteration of the process is realized, and collaborative regulation process parameters for stably preparing 8N high-purity indium are obtained.

The invention relates to the technical field of MS sealant testing, and discloses MS sealant limit condition simulation equipment and a testing method.The MS sealant limit condition simulation equipment comprises a simulation equipment whole body, and the simulation equipment whole body comprises a bidirectional reciprocating motion mechanism; an opening and closing separation mechanism; the refrigeration simulation mechanism is used for simulating a freezing environment; and the cleaning mechanism is used for cleaning the MS sealing glue. According to the invention, the refrigeration simulation mechanism and the cleaning mechanism are innovatively and tightly connected together, when the refrigeration simulation mechanism works, the refrigerator deflects and swings back and forth, and the refrigerator sprays out refrigeration gas, the cleaning mechanism also works synchronously, and a cleaning brush in the cleaning mechanism also swings back and forth synchronously; the cleaning brush is used for cleaning redundant MS sealing glue dripping from the sealing part, the redundant MS sealing glue is prevented from falling to the lower portion, adhesion of a mechanical structure is avoided, the two sets of mechanisms are tightly connected, and working synchronism is guaranteed.

The invention discloses a polycrystalline material microstructure crack evolution simulation and mechanical property prediction method and system. The method comprises the following steps: establishing a voronoi geometric model of a polycrystalline material containing grain characteristics and microstructure defect characteristics; carrying out spatial distribution modeling on the mechanical property parameters of the polycrystalline material based on a probability statistics theory; importing the voronoi geometric model of the polycrystalline material into a multi-physics field simulation software platform, establishing a complete simulation geometric model for crack prediction based on a phase field fracture theory, and performing phase field solution; setting corresponding material parameters according to the material attributes; and setting corresponding boundary conditions in simulation software to simulate a four-point bending experiment, solving a phase field fracture control equation by utilizing a finite element algorithm, capturing a change rule of a crack propagation path, and recording key mechanical data. According to the method, the polycrystalline Voronoi model is constructed, spatial distribution modeling is carried out on the mechanical parameters of the material in combination with the probability statistics theory, and the non-uniform characteristic of the actual material can be reflected more truly.

The invention discloses a DDDA-based numerical simulation method and a DDDA-based numerical simulation system for a progressive failure process of an elastic and brittle material. The method comprises the following steps: S1, constructing a two-dimensional DDDA numerical model consistent with a real elastic and brittle material sample in geometric size by taking the geometric parameters of the real elastic and brittle material sample as a reference; s2, grouping the circle units in the established numerical model by taking the compression-draw ratio of the real elastic and brittle material as a reference; s3, based on the proposed three-spring bonding circle unit model, bonding the circle units, and adding bonding units; s4, calibrating input parameters of the numerical model by taking the mechanical parameters of the real elastic and brittle material sample as a reference; and S5, according to a calibration result, adding boundary conditions to the numerical model, and simulating a progressive failure process of the elastic and brittle material. According to the method, the progressive failure process of the elastic and brittle material is accurately predicted, and the method has the characteristics of high simulation precision and high practicability.

The invention provides a gate pump group flood control and drainage optimization scheduling method and device, a medium and a program product, and relates to the field of urban flood control and drainage. The method comprises the steps of firstly obtaining historical flood and gate pump operation data of a target area, and inputting the historical flood and gate pump operation data into a long-short-term memory neural network to construct a prediction model which is used for flood change conditions under different scheduling strategy combinations; setting different initial conditions to simulate calculation to determine a strategy combination effect, further determining flood control and drainage effects, selecting an optimal combination, and taking the optimal combination and the initial conditions as a sample training network. And then receiving real-time meteorological and hydrological data, determining an actual optimal combination and sending the actual optimal combination to a display end. According to the method, a scheduling strategy is scientifically determined through data and a model, dynamic adjustment can be carried out according to real-time data, and scientificity and effectiveness of flood control and drainage are improved.

The invention provides a high-fidelity generalization method and system for plain river network water flow simulation, and relates to the technical field of model simulation. The method comprises the steps that a node river network is constructed, constructing a physical river network topological structure comprising a main river channel node, a river reach, a regulation and storage node and a virtual river reach; a dynamic parameter configuration step: configuring hydraulic parameters for the section in the physical river network topological structure; a boundary coupling step: distributing water catchment unit runoff obtained by calculation of the hydrological model to corresponding regulation and storage nodes as boundary input conditions; and a simulation execution step: performing hydrodynamic simulation calculation based on the constructed physical river network topological structure, the configured hydraulic parameters and the distributed boundary input conditions. Through a high-low water level dynamic parameter method, a hydrodynamic model parameter calibration method is optimized, especially for rivers with large water level fluctuation amplitude, and the accuracy of simulation results is ensured.

The application discloses a kind of critical conductivity simulation calculation method and system of chain structure impressed current protection, by building COMSOL simulation model, according to wire diameter, chain structure size, metal material conductivity, set current physical field related parameters in COMSOL software, for simulating calculation under different conductivity caused potential attenuation;According to the seawater conductivity obtained in test, the conductivity of metal material, polarization curve, set the secondary current distribution physical field related parameters in COMSOL software, and combine the potential attenuation obtained in current physical field as boundary condition simulation potential distribution under steady state in seawater, if potential distribution reaches the requirement of protection potential, the conductivity corresponding to potential attenuation at this time is critical conductivity.The method can accurately and conveniently evaluate the critical conductivity of chain structure impressed current cathodic protection, and provide a reference for the design of chain structure impressed current cathodic protection system.

The application discloses a hierarchical simulation geological modeling method under anisotropic tensor and uncertainty constraint, relates to the technical field of geological modeling, and comprises the following steps: inputting selected profile sample grade data, fitting a variation function and defining simulation parameters; performing conditional simulation according to the simulation parameters to generate a plurality of simulation implementations reflecting spatial anisotropy; controlling a hierarchical decomposition process through checking a termination condition, performing threshold smoothing processing on a sub-region after termination, saving an optimal threshold value and a class probability field of the sub-region, updating a global probability field by using a back transmission mechanism, outputting a grid of a final class probability field, and forming a rasterized ore body shape. The application obtains local threshold optimization through continuous hierarchical simulation and iteration, replaces unoptimized results, and forms optimal simulation results of the ore body, so that the uncertainty transmission of a traditional method is effectively reduced, and the accuracy and rationality of geological domain division are improved.

The application relates to the technical field of roadbed engineering, and discloses an experimental simulation system for preventing and treating water migration of a roadbed covering effect, which comprises an environment simulation module, a water monitoring module, a prevention and treatment module and a central control module. The environment simulation module comprehensively regulates and controls multiple climate factors such as temperature, humidity, precipitation and evaporation, reproduces actual environmental conditions in different regions and seasons, simulates the real scene of water migration of the roadbed covering layer, improves the accuracy and reliability of experimental simulation, and provides a solid data basis for the research of prevention and treatment measures. The water monitoring module is used for monitoring the distribution and migration state of water in the roadbed model in real time, multi-point sensing technology is used to obtain the volume water content, matrix suction and seepage rate data at different depths and positions, the water abnormal accumulation area is identified, the migration trend and rate are judged in combination with a water migration model, and the monitoring and abnormal early warning of the water migration process are ensured.

The invention relates to the technical field of oil development, and discloses a thin oil treatment process flow analog simulation method and device, a medium and equipment. The method comprises the following steps: establishing a mechanism calculation model of each sub-device in a thin oil treatment process flow; associating the mechanism calculation model of each sub-device, and calling a function to perform coupling calculation; different initial conditions are set, and the change process of technological parameters in the production process during component change is simulated; setting a plurality of input conditions, and initializing analog simulation based on the input conditions to control component change; and performing analog simulation to obtain a simulation result. According to the method, a set of complete thin oil treatment process flow analog simulation method is constructed, the dynamic analog simulation process of the thin oil treatment process flow is realized, and real-time calculation of simulated dynamic working conditions is realized; according to the method, verification can be carried out before actual use, the effect after adjustment and existing potential safety hazards can be directly reflected before an optimization scheme is implemented, and the field process is convenient to adjust.

The present invention discloses a method for simulating the fluidity of a composite material filled with multi-particle diameter fillers. The method comprises: setting filler geometry information, and dividing unit grids according to the maximum filler particle size; determining filler physical property parameters and filler-filler, filler-wall contact models according to discrete element simulation, and defining a particle generator and model boundary conditions; using a particle diameter growth method to generate a random distribution structure of particles, and setting the initial velocity of the linear distribution of particles; determining a matrix material density and viscosity model, setting boundary conditions, and simulating the three-dimensional Couette flow of the matrix material at a given shear rate; using discrete element software to generate a dynamic link library file, and importing a coupling file; using computational fluid dynamics software to set coupling parameters, and importing a coupling file; combining computational fluid dynamics software with discrete element software for coupling calculation, and calculating the viscosity of the composite material. The present invention can more accurately and comprehensively analyze the viscosity variation law of composite materials filled with fillers of various shapes.

The invention discloses a layered simulation geologic modeling method under anisotropic tensor and uncertainty constraints, and relates to the technical field of geologic modeling, and the method comprises the steps: inputting selected profile sample grade data, fitting a variation function, and defining simulation parameters; performing condition simulation according to the simulation parameters to generate a plurality of simulation implementations reflecting spatial anisotropy; and controlling a hierarchical decomposition process by checking a termination condition, performing threshold smoothing processing on the terminated sub-region, storing the optimal threshold and the class probability field of the sub-region, updating the global probability field by using a return mechanism, outputting a grid of the final class probability field, and forming a rasterized ore body form. According to the method, local threshold optimization is obtained through continuous layered simulation and iteration, an unoptimized result is replaced, and an optimal simulation result of the ore body is formed, so that uncertainty conduction of a traditional method is effectively reduced, and the accuracy and rationality of geological domain division are improved.

The application provides a multiscale geological model cross-scale nesting and fusion modeling method, belonging to the geological field, including four steps of multiscale data preprocessing, data fusion, cross-scale nesting and fusion and dynamic coupling. This method can integrate multi-source heterogeneous data, realize data fusion through joint probability space, variational assimilation framework, fuzzy logic conflict factor and alternating direction multiplier method, utilize deep learning auxiliary fusion technology such as multi-scale convolutional adversarial network to improve the stability and precision of the model. At the same time, the model parameters are determined through volume average upsampling algorithm and random field conditional simulation, and the consistency of the parameters between the models is realized through dynamic adjustment of ensemble Kalman filter and localized ensemble transform Kalman filter, bidirectional feedback and iterative optimization. Finally, through the double grid strategy and the restrictive interpolation, the multiscale convergence is realized, and the convergence and dynamic balance of the model on the scale of kilometers to microns are ensured.

The invention belongs to the technical field of oil-gas exploration, and particularly relates to an oil-water wave field numerical simulation method based on a Stan-Chen biphase LBM model, which comprises the following steps: introducing a Stan-Chen force action item, and constructing the biphase LBM model; the method comprises the following steps: initializing biphase LBM model parameters and setting boundary conditions, simulating oil-water biphase wave field propagation, and updating a particle distribution function and macroscopic wave field information; and a final simulation result is obtained through operations such as wave field feature extraction. In the scheme, the interaction force of the oil phase and the water phase is expressed through a potential function, a multi-scale flow and wave field interaction mechanism is introduced, in complex oil-water wave field simulation, the transmission characteristics in the wave field propagation process can be simulated, the detail change of the phase interface can be captured, and the simulation precision of the oil-water wave field is improved. Therefore, a more reliable numerical solution is provided for wave field simulation in oil-gas exploration, and the method has wide application prospects and technical values especially in the exploration process of deepwater and unconventional oil-gas resources.

The present application relates to a simulation evaluation device for coils, including a first pressing component, a second pressing component, a supporting component, a fixing assembly and a counterweight. By adjusting the weight of the counterweight to adjust the pressure value applied by the second pressing component, different pressure test conditions can be flexibly set, which can significantly improve the accuracy of experimental tests in a laboratory environment, help identify potential problems in advance, and thus reduce losses in actual production. Other related components in the device have been optimized and upgraded to achieve precise control of key factors such as the pressure position and temperature, and can comprehensively simulate and evaluate the impact of various external conditions on the coil. The present application also uses a replaceable sub-pressing part to simultaneously test coils in multiple different states in a single experiment, greatly improving the flexibility and test efficiency of the coil simulation test of related conditions.

The application provides a kind of side slope simulation experiment platform, including: frame unit, tray assembly, lifting device and buffer unit, tray assembly is slidably installed on frame unit, and tray assembly is used to install side slope model;Lifting device is arranged at the top of frame unit, and lifting device is used to drive tray assembly to move along frame unit, so that the tray assembly with side slope model is moved to the initial position of experiment;Buffer unit is arranged at the bottom of frame unit, and towards the side of lifting device, buffer unit is used to receive tray assembly, so that the tray assembly with side slope model slows down. Side slope simulation experiment method includes making side slope model, applying simulation conditions, simulating falling experiment. The application can directly obtain the safety factor of side slope model, and the structure is simple and reliable, and the experiment cost is low.

Coal rock three-dimensional strain field visual system and method are provided under mining influence. The system includes a stress condition simulation system and a strain monitoring system. The stress condition simulation system includes a similar simulation experiment rack, a loading system and a circular slideway. The method includes preparing a 3D printing wire, printing a strain visual similar model, simulating a stratum dip angle and a gas-containing condition, applying stress fields, recording a cracking and dyeing condition of microcapsules inside the model, and the like. The system can realize tracing the generation and development of internal cracks in simulation models with complex geological conditions, and tracing the three-dimensional movement of internal ink dots to draw four-dimensional images of displacement fields.

The invention relates to the technical field of aero-engine air inlet condition simulation control, and discloses a feed-forward control law design method and a feed-forward control law design system based on a large-cavity effect model. A dynamic disturbance model with a pressure disturbance amplitude and a pressure regulation time as coordinate values is established, and real data is used for comparison and check, so that the pressure disturbance amplitude and the pressure regulation time are calculated; forming an optimized dynamic disturbance model; and finally, a feed-forward control law based on transition state flow dynamic characteristics and air inlet total pressure change differential is constructed through valve adjusting characteristics, and the feed-forward control quantity of each air inlet branch is calculated in real time. According to the invention, while the pressure disturbance rejection capability of the air inlet control system of the test equipment in the dynamic response test is improved, the multi-branch feedforward control quantity can be calculated and output in the actual transition state test; the method is beneficial for improving the transition state control quality of the test equipment air inlet control system on the total air inlet pressure in the engine transition state test, reducing the deviation value of the disturbance of the total pressure, and improving the simulation precision of the total air inlet pressure in the transition state test.

The invention discloses a fractured medium attenuation characteristic numerical simulation method based on an improved BISQ model, and relates to the technical field of geophysical exploration, and the method comprises the steps: S1, building a pore fluid pressure-displacement coupling equation of the improved BISQ model under a quasi-static condition as a target form equation; s2, establishing a representative fracture medium numerical model according to reservoir fracture characteristics; s3, carrying out an oscillation compression numerical simulation experiment, and simulating boundary disturbance of elastic waves on the model by controlling boundary conditions; and S4, calculating a complex stress-strain field generated when the model responds to boundary disturbance under different frequencies, and calculating a complex longitudinal wave modulus and a longitudinal wave attenuation factor by using an average value of a vertical stress-strain body. The quasi-static numerical simulation method provided by the invention can calculate seismic wave energy dissipation under the combined action of Biot flow and jet flow of the rock model; and the frequency-dependent seismic attenuation characteristics of the fluid-containing crack medium are represented.

The invention discloses a comparison test system for a two-axis motion controller on a simulation test bench, and relates to the technical field of comparison test, the comparison test system comprises a test bench, the upper end of the test bench is provided with a test mechanism, the test mechanism comprises a slide rail and a lead screw which are respectively arranged on the test bench, and the slide rail and the lead screw are respectively arranged on the test bench in a front-back symmetrical manner. The right end of the lead screw is provided with a locking sleeve used for being connected with a two-axis motion controller; the upper end of the sliding seat is provided with a supporting column; the upper end of the supporting column is provided with a rotating sleeve; the side wall of the rotating sleeve is provided with sliding shells; the first pressure applying mechanism and the second pressure applying mechanism are used for simulating load conditions on the carrying connecting piece and simulating data information of synchronous driving of the two motion controllers, and test data of the two-axis motion controller under different load conditions can be tested rapidly, efficiently, concisely and comprehensively.

The invention provides a transportation condition simulator and a transportation condition simulation method. According to the transportation condition simulator provided by the invention, through the combination of the flight environment simulator, the ground environment simulator and the temperature and humidity environment simulator, multiple composite typical environment conditions in the transportation process are accurately simulated, and the stability and tolerance of a product in different transportation modes and extreme environments can be tested; secondly, through the cooperation of the sensor group and the controller, the sensor group can monitor the simulated transportation environment in real time, and when the controller detects that the current simulated transportation environment is inconsistent with the actual transportation condition, parameters of the simulator assembly are immediately adjusted; therefore, the simulation environment condition simulated by the simulator assembly can be ensured to fit the actual condition as much as possible, and the simulation accuracy and the reliability of the simulation result can be ensured.

The invention belongs to the technical field of reactor thermal hydraulic tests, and particularly relates to a test system for simulating the passive safety injection process of a full-pressure water replenishing tank under a water loss accident. The system comprises a pressure vessel simulation body, a full-pressure water replenishing tank simulation body and steam generation equipment, the top and the bottom of the full-pressure water replenishing tank simulation body are respectively connected with the pressure vessel simulation body through a balance pipeline and a safety injection pipeline; the height difference between the full-pressure water replenishing tank simulation body and the pressure vessel simulation body is consistent with that of the prototype; the top of the full-pressure water replenishing tank simulation body is also connected with steam generation equipment through a steam pipeline, and measurable steam flow is provided through the steam generation equipment; a steam pipeline adjusting valve is connected to the steam pipeline in series. According to the embodiment of the invention, the transient process boundary conditions of the full-pressure water replenishing tank are constructed, the water-water circulation mode and the steam water circulation mode of the full-pressure water replenishing tank are simulated, and the fluid flow characteristics in the safety injection process of the full-pressure water replenishing tank and the safety injection characteristics under different conditions can be inspected.