In this paper, the biaxial flexural mount is presented according to the requirements of the large aspect ratio mirror of an off-axis three-mirror anastigmatic (TMA) space-borne telescope, and the process of the optimal design of the flexural mount structure is discussed in detail. From the perspective of mechanics-based design of space-borne mirror assembly structure and integrated optical-mechanical analysis, the optimal axial mounting position, the optimal mounting angle and the optimal structural critical dimensions of the flexure hinge were determined to improve the surface shape accuracy. Finally, the mechanical vibration test further proved the rationality of the structure design and the accuracy of the simulation analysis. The flexural mount proposed in this paper is can be applied to other reflective optics with high surface figure requirements. The optimization method proposed in this paper can also be applied to the optimization of other forms of flexural mount.
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