A digital twin model for rotor tip clearance prediction considering interval uncertainty

In order to achieve high-fidelity modeling and high-precision prediction of rotor tip clearance under uncertainty conditions，this study first analyzed the sources，types，and manifestations of uncertainty in the assembly process of multistage rotor and stator assembly process. Secondly，a digital twin model for predicting rotor tip clearance considering interval uncertainty was established，describing the assembly and measurement process of multistage rotor and stator in physical space，the assembly accuracy characterization model and the rotor tip clearance prediction model in virtual space. Then，deterministic representation models and interval representation models for processing sufficient and sparse statistical information were introduced，and a rotor tip clearance prediction model and prediction update method considering uncertainty were constructed. Finally，taking a multistage rotor and stator assembly process as an example，the accuracy and clarity of rotor tip clearance prediction and update were evaluated，and the results of deterministic prediction and uncertainty prediction were compared. The results showed that the method pro⁃ posed can achieve high-fidelity modeling and high-precision prediction of multistage rotor and stator assembly process driven by digital twins. © 2024 Chinese Society of Astronautics. All rights reserved.