94 / 2025-05-14 21:50:40

Optimization-Based Inverse Deduction Method for Unbalance Response at Aero-engine Casing Measurement Points Considering Complex Transfer Paths and Noise Interference

Noise interference,Whole-engine dynamic balancing,Probability Distribution,optimization-based inversion

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While whole-engine dynamic balancing can improve balancing efficiency, the actual engine measurement points located on the casing surface and the complex vibration transmission paths from excitation sources to measurement points make vibration signal inversion challenging. Additionally, the presence of multiple vibration excitation sources on the casing leads to susceptibility to multi-source noise interference, further reducing the accuracy of unbalance quantification through casing measurements. To address these issues, this study proposes a statistical analysis approach for vibration response inversion under noise interference, based on the statistical distribution characteristics of engine measurement data. A vibration response noise simulation method using stochastic numerical modeling is developed to replicate noise-interfered vibration signals. Through harmonic response analysis of a high-fidelity 3D solid finite element model of the engine, influence coefficients considering complex casing transmission paths are obtained. These coefficients, combined with noise-contaminated unbalance response inversion, generate multiple sets of inverse-calculated unbalance excitations. Back-substitution computation yields corresponding inverse response results. Statistical analysis reveals that the mean deviation rate between original and inverse responses ranges between 5% and 15%, demonstrating significantly improved stability compared to single group response inversion methods. Simulation verification under complex transmission paths and noise interference conditions confirms the feasibility of the statistical inversion methodology. This research provides theoretical support and methodological references for engineering applications of whole-engine dynamic balancing in aeroengines.