CN-122021393-A - Amphibious ship water inlet safety perception early warning method and system based on fluid-solid coupling simulation

CN122021393ACN 122021393 ACN122021393 ACN 122021393ACN-122021393-A

Abstract

The invention relates to the technical field of amphibious ship safety control, in particular to an amphibious ship water inlet safety perception early warning method and system based on fluid-solid coupling simulation, wherein the method comprises the steps of constructing a three-phase fluid-solid coupling numerical model of the amphibious ship water inlet process, and introducing a contact force source item of a tire and the ground at the interface of a solid domain and a fluid domain; the method comprises the steps of carrying out multi-condition simulation based on a three-phase flow solid coupling numerical model, constructing a simulation data feature vector sample set, training a risk discrimination model through the simulation data feature vector sample set, integrating the risk discrimination model into a ship-borne real-time early warning system, acquiring the motion state and surrounding water level information of the amphibious ship in real time, carrying out risk grade judgment through the risk discrimination model, and executing a corresponding early warning strategy according to the output risk grade. According to the invention, through the fusion of high-precision off-line simulation and on-board real-time perception, on-line recognition and active early warning of the water inlet risk can be realized, and the safety and controllability of the amphibious ship under the complex water inlet working condition are improved.

Inventors

XIAO GUOQUAN
Wen Shishun

Assignees

华南理工大学

Dates

Publication Date: 20260512
Application Date: 20251224

Claims (9)

1. The amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation is characterized by comprising the following steps of: S1, constructing a three-phase fluid-solid coupling numerical model of the amphibious ship water inlet process, wherein the three-phase fluid-solid coupling numerical model comprises a solid domain model and a fluid domain model, simulating interaction between a ship body structure and fluid through the solid domain model and the fluid domain model, and introducing a contact force source item of a tire and the ground at the interface of the solid domain and the fluid domain; S2, carrying out multi-station simulation based on a three-phase flow solid coupling numerical model, extracting amphibious ship movement state information and surrounding water level information in the water inlet process of the amphibious ship from simulation results, constructing a simulation data feature vector sample set, and training a risk discrimination model through the simulation data feature vector sample set; And S3, integrating the risk discrimination model into a shipborne real-time early warning system, acquiring the motion state and surrounding water level information of the amphibious ship in real time through a shipborne multi-source sensor, judging the risk level through the risk discrimination model, and executing a corresponding early warning strategy according to the output risk level.
2. The amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation according to claim 1, wherein the step S1 comprises the following steps: S11, constructing a solid domain model and a fluid domain model, dividing structural grids of the solid domain model and the fluid domain model, and setting material properties of the solid domain model and the fluid domain model; S12, introducing a tire-ground contact force source term into a solid dynamics equation, solving a dynamics equation of a fluid domain and a solid domain based on a gas-liquid-solid three-phase flow solid coupling numerical model, outputting a displacement field comprising translation, rotation and local deformation, and calculating an effective flow field range and a pressure field in an overlapped area according to the displacement field.
3. The amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation according to claim 2, wherein the step S11 comprises the following steps: Constructing a solid domain model based on an amphibious ship three-dimensional CAD model through finite element analysis software, generating structural grids of the solid domain model by adopting a mixed grid division strategy, and defining material properties of the solid domain model, wherein the solid domain model comprises finite element models which refer to a ship body, a tire and a water entry ramp; constructing a fluid domain model by computational fluid dynamics simulation software, wherein the fluid domain model is used for calculating the evolution of flow field pressure and free liquid level, dividing fluid grids of the fluid domain model by an overlapped grid method, and setting the calculated domain size according to SIMULIA open water area criteria; And setting a physical model of the fluid domain model, constructing a synergistic system of a VOF multiphase flow model and a Realizable k-epsilon turbulence model, wherein the VOF multiphase flow model is used for tracking a water-air interface, and the Realizable k-epsilon model is used for adapting to a strong shear flow scene.
4. The amphibious ship water inflow safety perception early warning method based on the fluid-solid coupling simulation is characterized in that a mixed grid division strategy is adopted to generate structural grids of a solid domain model through finite element analysis software, the method comprises the steps of setting finite element grid division parameters, enabling unit types of a main structure of a ship body to be first-order linear tetrahedron units, enabling unit types of tires to be hexahedral units, enabling local encryption to be conducted to a preset value in a stress concentration area, enabling the number of the units to be increased to form gradient transition, enabling multi-layer boundary layer prismatic units to be generated on the contact surface of the ship body and fluid, enabling the total thickness of the boundary layer and the grid growth rate to be set, and enabling the grid growth rate to be gentle transition.
5. The amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation according to claim 2, wherein the step S12 comprises the following steps: S121, adding a tire-ground contact force source item into a solid dynamics equation, as an additional load acting on a tire structure, solving the solid dynamics equation added with the tire-ground contact force source item through finite element analysis software Abaqus, and outputting a displacement field comprising translation, rotation and local deformation; s122, solving a dynamic equation of the fluid domain through computational fluid dynamics simulation software, and calculating an effective flow field range and a pressure field in the overlapped area according to the translational, rotational and local deformation displacement fields.
6. The amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation according to claim 2, wherein the step S2 comprises the following steps: s21, carrying out multi-station simulation based on a three-phase flow solid coupling numerical model, collecting amphibious ship movement state information and surrounding water level information of the water inlet process of the amphibious ship at different time steps as working condition sample data, labeling the working condition sample data with corresponding risk grade labels, and constructing a simulation data feature vector sample set; s22, splitting the simulation data feature vector sample set into a training set, a verification set and a test set, training a three-level classification model based on the simulation data feature vector sample set by adopting a support vector machine or a random forest algorithm, and optimizing super parameters of the three-level classification model through cross verification to obtain a trained three-level classification model; And S23, evaluating the performance of the risk judging model, and when the evaluation result is judged to be qualified, performing light weight processing on the risk judging model and generating an embedded model file.
7. The amphibious ship water inflow safety perception early warning method based on the fluid-solid coupling simulation according to claim 6, wherein the amphibious ship movement state information and the surrounding water level information comprise the current water inflow speed, the water inflow angle, the pitching attitude and the relative water surface height.
8. The amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation of claim 6, wherein the ship-borne multi-source sensor comprises a GPS module, an inertial measurement unit and an ultrasonic water level meter.
9. Amphibious ship water inlet safety perception early warning system based on fluid-solid coupling simulation is characterized by comprising the following steps of The fluid-solid coupling simulation module is used for constructing a three-phase fluid-solid coupling numerical model of the water inlet process of the amphibious ship, the three-phase fluid-solid coupling numerical model comprises a solid domain model and a fluid domain model, the interaction between a ship body structure and fluid is simulated through the solid domain model and the fluid domain model, and a contact force source item of a tire and the ground is introduced at the interface of the solid domain and the fluid domain; The feature extraction and model training module is used for carrying out multi-condition simulation based on the three-phase flow solid coupling numerical model, extracting amphibious ship movement state information and surrounding water level information in the water inlet process of the amphibious ship from simulation results, constructing a simulation data feature vector sample set, and training a risk discrimination model through the simulation data feature vector sample set; The shipborne data acquisition module is used for integrating and driving the multi-source sensor and acquiring the motion state and the peripheral water level information of the amphibious ship in real time; and the risk judging and early warning executing module is used for loading and running a risk judging model at the shipborne terminal, judging the risk level by the amphibious ship motion state and the surrounding water level information, driving the audible and visual alarm device or communicating with the whole ship controller according to the risk level, and executing an early warning strategy.

Description

Amphibious ship water inlet safety perception early warning method and system based on fluid-solid coupling simulation Technical Field The invention relates to the technical field of amphibious ship safety control, in particular to an amphibious ship water inlet safety perception early warning method and system based on fluid-solid coupling simulation. Background The amphibious ship needs to frequently finish land-to-water area transition in landing, rescue or cross-country tasks, the ship body is subjected to remarkable fluid impact at the moment of water entry, pitch imbalance, lateral sliding and local structural overload are easy to occur, and because a driver mainly controls the water entry speed, angle and time empirically, quantitative reference is lacking, and important accident cases such as sinking, overturning and the like occur repeatedly in practical tasks. The existing research is mainly focused on static floating state and stability check, the system test data aiming at the strong coupling and nonlinear process of 'water-in transient state' is rare, the physical test cost is high, the repeatability is poor, and the full working condition is difficult to cover. The vehicle wading simulation method provided by the prior patent application with the patent application number of CN202510939155.X can comprehensively simulate the vehicle wading process, but the method adopts a form with a certain ground clearance height for simulation, and does not consider the acting force between the vehicle and the ground. The existing autonomous water inlet and outlet switching control method for the amphibious vehicle evaluates risks and decides whether to execute mode switching by fusing acquired data of multiple sensors, but only depends on environment data, lacks synchronous consideration of self-posture and dynamic response of the hull, is not associated with high-precision fluid-solid coupling results, is difficult to capture gas-liquid-solid three-phase coupling involved in the water inlet process of the amphibious vehicle, and cannot be well adapted to low-speed and large-deformation water inlet scenes of the amphibious vehicle under complex terrains. Therefore, a general method for integrating high-precision off-line simulation and on-board real-time perception is needed, and a water inlet safety early warning means which can cover all working conditions and can be embedded is provided for the amphibious ship. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides the amphibious ship water inlet safety perception early warning method and system based on fluid-solid coupling simulation, and the online recognition and active early warning of water inlet risks are realized through the fusion of high-precision offline simulation and shipborne real-time perception, so that the safety and controllability of the amphibious ship under complex water inlet working conditions are improved. The invention provides a method for sensing and early warning water inlet safety of an amphibious ship based on fluid-solid coupling simulation. The second aim of the invention is to provide an amphibious ship water inlet safety sensing and early warning system based on fluid-solid coupling simulation. The aim of the invention can be achieved by adopting the following technical scheme: the amphibious ship water inlet safety perception early warning method based on fluid-solid coupling simulation comprises the following steps: S1, constructing a three-phase fluid-solid coupling numerical model of the amphibious ship water inlet process, wherein the three-phase fluid-solid coupling numerical model comprises a solid domain model and a fluid domain model, simulating interaction between a ship body structure and fluid through the solid domain model and the fluid domain model, and introducing a contact force source item of a tire and the ground at the interface of the solid domain and the fluid domain; S2, carrying out multi-station simulation based on a three-phase flow solid coupling numerical model, extracting amphibious ship movement state information and surrounding water level information in the water inlet process of the amphibious ship from simulation results, constructing a simulation data feature vector sample set, and training a risk discrimination model through the simulation data feature vector sample set; And S3, integrating the risk discrimination model into a shipborne real-time early warning system, acquiring the motion state and surrounding water level information of the amphibious ship in real time through a shipborne multi-source sensor, judging the risk level through the risk discrimination model, and executing a corresponding early warning strategy according to the output risk level. Specifically, the step S1 includes: S11, constructing a solid domain model and a fluid domain model, dividing structural grids of the solid domain model and the fluid domain model, a