空间引力波航天器质心自引力耦合效应分析OA

To meet the need for fast and interpretable in-orbit evaluation of the self-gravity disturbances acting on the test masses(TMs)of space-based gravitational-wave detection spacecraft under propellant consumption-induced mass distribution changes,this paper investigates the coupling effects among the spacecraft center of mass(CG),self-gravity center(SG),and test mass(TM)under fuel-consumption conditions,and proposes a coupled fast-prediction approach.First,finite-element analyses are performed to quantify how the spacecraft geometry and the propellant-consumption-driven mass redistribution affects the SG,yielding a dataset that includes CG,SG,and related quantities.Second,piecewise linear coupling matrices for"CG-SG"and"CG-TM self-gravity"are identified,and singular value decomposition(SVD)is used to verify the near one-dimensional evolution of the CG,thereby reducing the problem to a scalar parameter.Finally,based on this scalar parameter,a piecewise cubic Hermite interpolating polynomial(PCHIP)mapping is constructed to enable rapid prediction of the SG position and the self-gravity increments at the TMs.Results show that,within the test intervals,the proposed model maintains good consistency even in fuel-consumption ranges not used for model construction:the PCHIP prediction error of the SG remains at the millimeter level,and the predicted self-gravity increments at the TMs are stable.This converts high-fidelity computations into a lightweight surrogate model suitable for online evaluation and reveals the coupling between the spacecraft CG and SG.