Inverse finite element method based shape reconstruction for spaceborne antenna structures under thermal load
To realize real-time deformation monitoring of spaceborne antenna structures in operation,the strain-based inverse finite element shape reconstruction method was investigated for satellite antenna structures under real distributed thermal loads.Firstly,the shape monitoring method based on four node quadrilateral in-verse shell elements was proposed for antenna plate structures.The division of inverse elements was optimized by the established displacement-gradients-based element division method.The matrix relationship between the structural strain and the displacement was put forward by utilizing the least squares error function.Secondly,a thermal test system for the antenna plate was established and the temperature distribution of the structure under typical thermal loads was obtained.Then,a finite element model for composite antenna panel under typical experimental temperature difference conditions was established.The surface strain and the displacement of the structure were obtained.Finally,the effectiveness of the proposed shape reconstruction method was validated under typical thermal loads.The results show that the displacement error of the shape reconstruction was no more than 0.5 mm.Therefore,the inverse finite element method can accurately reconstruct the deformation of the antenna plates under typical thermal loads.
spaceborne antennadistributed thermal loadinverse finite element methodshape reconstruction
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