Micro-vibration modeling and analysis of large-aperture space telescope with parabolic truss support

The optical surface error of the space telescopes plays a decisive role in the image quality. As a key structural component supporting large-aperture optical payloads, the elastic response of the truss support structure under micro-vibration disturbances significantly affects wavefront quality. The paper focuses on a typical segmented primary mirror system and constructs a parameterized model of the truss support structure. The dynamic response of the structure under micro-vibration is systematically analyzed, and the resulting mirror surface deformation is reconstructed using Zernike polynomials. The results demonstrate that the structure exhibits highly localized dynamic responses at specific modal frequencies, which in turn induce optical aberrations, including low-order astigmatism and high-order coma. These findings demonstrate the high sensitivity of the truss structure to micro-vibration. The study elucidates the coupling relationship between structural dynamics and optical performance, providing theoretical support for structural optimization and vibration suppression in high-precision imaging systems.