Physical digital twin modeling method and apparatus for assembly, electronic device and medium

An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein when the processor executes the program, the following steps are performed:

• generating a geometric distribution error surface of an assembly surface of a part which is a mechanical part, by measuring geometric distribution errors of the assembly surface to obtain geometric distribution error data, the geometric distribution error data being point cloud data;
• establishing an ideal model of the part without the geometric distribution error surface;
• integrating the geometric distribution error surface with the ideal model to establish a geometric distribution error integrated model of the part;
• assembling the geometric distribution error integrated model of the part on a computer to establish a geometric digital twin model of the assembly;
• adding physical conditions to the geometric digital twin model of the assembly to establish a physical digital twin model of the assembly, wherein the physical conditions include one or more of material properties, mechanical conditions and temperature environment;
• and
• assembling the part of the assembly in an actual environment according to the physical digital twin model of the assembly;
• wherein the assembling the geometric distribution error integrated model of the part on a computer to establish a geometric digital twin model of the assembly is based on determining a stable contact mode between the geometric distribution error surface and another geometric distribution error surface corresponding to another mechanical part of the assembly, and the stable contact mode is determined from a plurality of three-point contact modes between the geometric distribution error surface and the another geometric distribution error surface;
• and the following step is performed:
• according to the determined stable contact mode, assembling the part on a premise of ensuring stable contact of the assembly surface, so as to establish the geometric digital twin model of the assembly;
• wherein the adding physical conditions to the geometric digital twin model of the assembly to establish a physical digital twin model of the assembly, comprises:
• meshing the geometric digital twin model of the assembly, and setting material parameters, contact conditions, load conditions and temperature parameters to the geometric digital twin model of the assembly;
• carrying out assembly stress analysis by applying uniform screw pre-tightening force to the part of the assembly, to obtain a stress nephogram of the part of the assembly, and determining the stress nephogram of the part as the physical digital twin model of the assembly;
• and
• wherein the virtual assembly parameters include accuracy parameters and property parameters, and the property parameters include at least one of mechanical properties or vibration frequency, and the mechanical properties comprise at least one of stress distribution or maximum stress, and the method further comprises:
• in response to that surface stress distribution around tightly fastened screws in the physical digital twin model does not meet the assembly parameter requirements, adjusting pre-tightening force applied to the screws until the property parameters meet the assembly parameter requirements.

A non-transitory computer-readable storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements the following steps:

• generating a geometric distribution error surface of an assembly surface of a part which is a mechanical part, by measuring geometric distribution errors of the assembly surface to obtain geometric distribution error data, the geometric distribution error data being point cloud data;
• establishing an ideal model of the part without the geometric distribution error surface;
• integrating the geometric distribution error surface with the ideal model to establish a geometric distribution error integrated model of the part;
• assembling the geometric distribution error integrated model of the part on a computer to establish a geometric digital twin model of the assembly;
• adding physical conditions to the geometric digital twin model of the assembly to establish a physical digital twin model of the assembly, wherein the physical conditions include one or more of material properties, mechanical conditions and temperature environment;
• and assembling the part of the assembly in an actual environment according to the physical digital twin model of the assembly;
• wherein the assembling the geometric distribution error integrated model of the part on a computer to establish a geometric digital twin model of the assembly is based on determining a stable contact mode between the geometric distribution error surface and another geometric distribution error surface corresponding to another mechanical part of the assembly, and the stable contact mode is determined from a plurality of three-point contact modes between the geometric distribution error surface and the another geometric distribution error surface;
• and the following step is implemented:
• according to the determined stable contact mode, assembling the part on a premise of ensuring stable contact of the assembly surface, so as to establish the geometric digital twin model of the assembly;
• wherein the adding physical conditions to the geometric digital twin model of the assembly to establish a physical digital twin model of the assembly, comprises:
• meshing the geometric digital twin model of the assembly, and setting material parameters, contact conditions, load conditions and temperature parameters to the geometric digital twin model of the assembly;
• carrying out assembly stress analysis by applying uniform screw pre-tightening force to the part of the assembly, to obtain a stress nephogram of the part of the assembly, and determining the stress nephogram of the part as the physical digital twin model of the assembly;
• and wherein the virtual assembly parameters include accuracy parameters and property parameters, and the property parameters include at least one of mechanical properties or vibration frequency, and the mechanical properties comprise at least one of stress distribution or maximum stress, and the method further comprises:
• in response to that surface stress distribution around tightly fastened screws in the physical digital twin model does not meet the assembly parameter requirements, adjusting pre-tightening force applied to the screws until the property parameters meet the assembly parameter requirements.