CN-121997469-A - Look-up type deformation matching and electromagnetic mapping digital twin system and method

CN121997469ACN 121997469 ACN121997469 ACN 121997469ACN-121997469-A

Abstract

The invention discloses a table look-up type deformation matching and electromagnetic mapping digital twin system and a method. The system pre-builds a multi-physical field simulation database taking the speed as a main key, stores a deformation three-dimensional model, pressure field data, radar cross section RCS data and characteristic point displacement, and builds a reduced scale model deformation-speed association list. And in an automatic mode, detecting the displacement of the characteristic points of the reduced-scale entity model in real time through a displacement detection module, calculating the current deformation quantity, reversely matching a speed main key by adopting a minimum absolute difference method based on the association list, further calling the corresponding multi-physical-field data, synchronously displaying a deformation three-dimensional model, a pressure field pseudo-color distribution and an RCS map on a visual rendering platform, and realizing the digital mapping from the entity deformation to a multi-physical-field state.

Inventors

YOU JIANWEI
REN ZIMING
ZHOU DI
XIE HUIXIANG
JIN YIYANG

Assignees

东南大学

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. A look-up table type deformation matching and electromagnetic mapping digital twin system, comprising: The database module is used for pre-constructing and storing multi-physical field data taking the speed as a main key, wherein the multi-physical field data at least comprises a deformation three-dimensional model, pressure field data, RCS data and characteristic point displacement; The mode control module supports the switching of a manual mode and an automatic mode and triggers a corresponding data matching flow according to the mode type; The displacement detection module is used for detecting the displacement of the feature points of the reduced scale entity model in real time in an automatic mode and calculating the current deformation; the communication module is used for realizing real-time data transmission between the displacement detection module and the data matching module in an automatic mode; The data matching module is used for directly searching the database module according to the speed input by a user in a manual mode, and reversely searching a speed main key based on real-time deformation detection data through a minimum absolute difference method of a reduced scale model deformation-speed association list in an automatic mode so as to further call corresponding multi-physical field data; And the visual rendering module synchronously renders a deformation three-dimensional model, pressure field pseudo-color distribution and RCS (global navigation system) map of the target in the visual rendering platform based on the matching result, so as to realize real-time digital mapping from entity deformation to multiple physical field states.
2. The system of claim 1, wherein the database module is pre-built by: Constructing a target full-size three-dimensional solid model based on the three-dimensional solid modeling tool, as an initial geometric boundary; In a multi-physical-field simulation platform and an electromagnetic scattering simulation platform, mesh division meeting requirements is completed based on an initial geometric boundary, wherein the electromagnetic simulation mesh size is not more than 1/10 of the minimum wavelength of a working frequency band; Building a pneumatic-structure unidirectional coupling simulation flow on a multi-physical-field simulation platform, performing coupling simulation on a plurality of speed working conditions in a preset speed interval, obtaining structure deformation results under each working condition, and deriving a deformation three-dimensional model file and pressure field data; Introducing a model file with consistent deformation into an electromagnetic scattering simulation platform by adopting an electromagnetic scattering simulation method, and solving to obtain RCS data containing amplitude and phase information under corresponding working conditions; And constructing a multi-physical field simulation database taking the speed as a main key, and constructing a reduced scale model deformation-speed association list based on the characteristic point displacement as an automatic mode reverse matching data source.
3. The system of claim 2, wherein the association list is constructed by extracting full-size model feature point Z-direction displacement original data under each speed working condition from a multi-physical-field simulation database, determining scaling factors of a full-size model and a reduced-scale detection model, converting displacement data into reduced-scale model deformation according to the scaling factors, associating the reduced-scale model deformation with corresponding speeds one by one to form an association list with index positions one by one, and unifying deformation data precision in the list into 3-bit decimal consistent with output precision of a displacement detection module.
4. The system of claim 1, wherein in the automatic mode, the data matching module performs the following reverse matching procedure: Receiving Z-direction displacement of a feature point of a reduced scale entity model detected in real time by a displacement detection module, taking the absolute value of the difference between the Z coordinate of the current feature point and the Z coordinate of the feature point in an initial non-load state as a current deformation quantity, traversing the deformation quantity list of the reduced scale model by adopting a minimum absolute difference method based on a preloaded association list, determining a matching index closest to the current deformation quantity, extracting a corresponding speed main key through the matching index, and further calling complete multi-physical-field data under the speed from a multi-physical-field simulation database.
5. The system of claim 1, wherein in the manual mode, a user directly inputs a speed working condition through a speed input box of the visual interaction interface, the system directly retrieves multi-physical field data of the corresponding working condition from the database by taking the input speed as a retrieval main key without going through a deformation detection and table lookup matching link, and the speed input box in the manual mode is in an enabled state, and the speed input box in the automatic mode is in a disabled state.
6. A table look-up type deformation matching and electromagnetic mapping digital twin method applied to the system of any one of claims 1-5, comprising the steps of: Firstly, pre-constructing a multi-physical field simulation database, namely acquiring a deformation three-dimensional model, pressure field data, RCS data and characteristic point displacement under different speed working conditions through multi-physical field simulation, establishing a database by taking the speed as a main key, and simultaneously constructing a scale model deformation-speed association list based on the characteristic point displacement; step two, receiving a mode selection instruction, and executing different data acquisition processes according to the selected mode: If the mode is a manual mode, receiving a speed working condition input by a user, and directly taking the speed as a retrieval main key to retrieve corresponding multi-physical-field data from the database; if the model is in an automatic mode, detecting the characteristic point displacement of the reduced scale entity model in real time through a displacement detection module, calculating the current deformation quantity, transmitting the deformation quantity to a data matching module through a communication module, reversely matching by adopting a minimum absolute difference method based on the association list to obtain a speed main key, and further calling corresponding multi-physical field data from the database through the speed main key; And thirdly, synchronously rendering the multi-physical field data acquired in the second step in a visual rendering module to realize real-time digital mapping from the physical deformation to the multi-physical field state, wherein the rendering is updated in real time according to user input in a manual mode, and the second to third steps are circularly executed according to the deformation detection result in an automatic mode.
7. The method of claim 6, wherein the pre-building the multi-physical field simulation database in the step one comprises: According to actual structural parameters, geometric features and physical properties of a target entity, a full-size target entity three-dimensional model is built by adopting a three-dimensional modeling tool, the model completely restores a key structure of the target and is consistent with the entity, and the model is used as an initial geometric boundary; Mesh division meeting corresponding simulation requirements is completed based on an initial geometric boundary in a multi-physical-field simulation platform and an electromagnetic scattering simulation platform respectively, wherein the electromagnetic simulation mesh size is strictly controlled to be not more than 1/10 of the minimum wavelength of a working frequency band; Performing pneumatic-structure unidirectional coupling simulation on a multi-physical-field simulation platform to obtain deformation three-dimensional models and pressure field data under different speed working conditions; Performing electromagnetic scattering simulation consistent with the structural deformation on an electromagnetic scattering simulation platform to obtain radar scattering section data under corresponding working conditions; And organizing and storing the data by taking the speed as a main key, converting the Z-direction displacement of the characteristic points of the full-size simulation model into reduced model deformation according to a scaling factor, and forming a reduced model deformation-speed association list corresponding to the corresponding speed value one by one at an index position, wherein the association list is a double-row parallel association list, and 3 decimal places are uniformly reserved for the list data precision.
8. The method according to claim 6, wherein the reverse matching in the automatic mode in the second step specifically includes: Starting a displacement detection module to monitor the feature points of the reduced scale solid model in real time, collecting Z-direction displacement data, taking the Z coordinates of the feature points in an initial non-load state as a reference, and calculating the absolute value of the difference between the current coordinates and the reference coordinates as the current actual deformation; After the data matching module decodes the restored deformation data, traversing the preloaded reduced scale model deformation-speed association list, calculating absolute differences between the current deformation and each deformation in the list, screening the minimum difference and obtaining a corresponding index, extracting a matching speed value as a speed primary key, and providing a retrieval basis for multi-physical field data retrieval.
9. The method of claim 6, wherein the step three of synchronously rendering by the visualization rendering module comprises: Loading a deformation three-dimensional model for three-dimensional display; rendering the pressure field distribution in pseudo-color form; Drawing an RCS map, and covering the whole spatial angle range; The visual interactive interface synchronously displays the current mode type, the speed value, the deformation quantity and the detection frame rate; The speed input box is in an enabling state in the manual mode, and is in a disabling state in the automatic mode.
10. The method of claim 6, wherein in the automatic mode, if the association list fails to be loaded or is empty, calling a preset single-sample matching function to obtain a preset default speed value as a speed primary key, and calling corresponding multi-physical-field data from a database by using the speed primary key.

Description

Look-up type deformation matching and electromagnetic mapping digital twin system and method Technical Field The invention relates to the technical field of digital twin and multi-physical-field coupling simulation of aircrafts, in particular to a table look-up type deformation matching and electromagnetic mapping digital twin system and method, which are suitable for linkage analysis and visual presentation of aerodynamic, structural and electromagnetic scattering characteristics of aircrafts. Background In the flight process of the aircraft, a significant coupling relationship exists between aerodynamic load, structural deformation and electromagnetic scattering characteristics of the aircraft. Especially under different speed working conditions, the surface pressure field of the aircraft can change, and then the structural parts such as wings, tail wings and the like are caused to generate elastic deformation, and the structural deformation can further influence the aerodynamic performance, structural safety and Radar Cross Section (RCS) characteristics of the aircraft. Therefore, in applications such as aircraft state assessment, stealth performance analysis, flight safety check, teaching demonstration, and the like, joint analysis and synchronous presentation of multiple physical field states such as aerodynamic, structural, electromagnetic and the like are often required. At present, aiming at multi-physical field coupling analysis of an aircraft, the prior art mainly has two types of realization paths, namely a working condition-by-working condition independent solving scheme for respectively developing aerodynamic flow fields, structural mechanics and electromagnetic scattering simulation aiming at working conditions of different speeds, postures and the like. The scheme can obtain analysis results under a single working condition, but is long in calculation period and high in calculation cost, and quick retrieval and real-time display of multiple working condition results are difficult to realize. Another type is a digital twin technical scheme oriented to a specific scene, for example, chinese patent with publication number CN121479922A, CN121580587a, although digital twin application has been implemented in a related scene, a real-time digital mapping complete scheme oriented to the aerodynamic-structural-electromagnetic multi-physical field coupling relationship of an aircraft has not been formed yet. Furthermore, the prior art generally lacks an implementation mechanism for carrying out rapid matching and synchronous mapping on multiple physical field states based on a solid model deformation detection result, and is difficult to consider two application requirements of rapid query under fixed working conditions and dynamic synchronization driven by solid deformation, and meanwhile, the prior art has defects in mode switching flexibility, operation convenience and real-time interactivity under different scenes such as teaching demonstration, scheme display, experiment verification and equipment evaluation. Therefore, it is necessary to provide a table look-up type deformation matching and electromagnetic mapping digital twin system and method based on a pre-constructed multi-physical-field simulation database, so as to realize rapid matching, synchronous display and visual expression between the physical deformation and the multi-physical-field state of the aircraft under the condition of no real-time simulation calculation. Disclosure of Invention The invention aims to provide a table look-up type deformation matching and electromagnetic mapping digital twin system and method, which are used for solving the problems of high calculation cost, low response speed, insufficient scene suitability and difficulty in considering the quick query of fixed working conditions and the dynamic synchronization of entity deformation driving in the prior art of multi-physical field coupling analysis of an aircraft. By pre-constructing a multi-physical-field simulation database and carrying out table lookup matching based on the current deformation of the entity model, the invention can realize rapid mapping and visual display of structural deformation, pressure field and electromagnetic scattering characteristics under the condition of no real-time simulation calculation. The technical scheme is that in order to achieve the purposes, the invention provides the following technical scheme: A look-up table type deformation matching and electromagnetic mapping digital twin system comprising: The database module is used for pre-constructing and storing multi-physical field data taking the speed as a main key, wherein the multi-physical field data at least comprises a deformation three-dimensional model, pressure field data, RCS data and characteristic point displacement; The mode control module supports the switching of a manual mode and an automatic mode and triggers a corresponding data matching flow according to