Microvibration Testing and Decoupling for Space Payloads with Large Inertia, High Stiffness, and Discrete Interfaces
PMC12694295
· 10.3390/s25237352
Gap Declaration
Based on the excitation of the CCA, the microvibration response of the SC can be calculated, achieving the dynamic decoupling analysis of the complex coupled system. Decoupling analysis indicates that in the frequency range of 8–300 Hz, the RMS values of the microvibration force and torque of the SC are 0.25 N and 0.08 N·m, respectively, meeting the requirements of the SC (≤0.4 N and ≤0.1 N·m). Future work can be extended in several directions to enhance the practical application and generalization ability of the proposed method. First, the methodology can be adapted to other types of space payloads with diverse structural characteristics (e.g., flexible attachments, multi-source excitation, or irregular interface distributions), expanding its engineering application scope to satellite antennas, precision spectrometers, and other high-precision space instruments. Second, integrating machine learning algorithms (such as neural networks or Gaussian process regression) into the finite element method (FEM) iterative correction process may improve the accuracy and efficiency of the model, especially for complex coupled systems with high-dimensional parameters.
Abstract
As the core observation instrument of the China Space Station Telescope (CSST), the Survey Camera (SC) generates microvibrations that significantly degrade the telescope’s imaging quality. Consequently, evaluating the microvibration response of the SC is of critical importance. However, for large-inertia, high-stiffness payloads like the SC with discrete interfaces, structural coupling between the payload and the test system leads to distortions in microvibration test results. Since the vibration transmission under structural coupling is not a simple series superposition, and the transfer functions of each link in the transmission path as well as the coupling correction matrices are difficult to obtain, this paper proposes a semi-physical simulation method for microvibration decoupling. Th…
Conclusions / Discussion
6. Conclusions For payloads such as the Survey Camera (SC), which feature large inertia, high stiffness, and discrete mounting interfaces, structural coupling tends to occur between the payload and the testing system during microvibration testing, thereby leading to distortions in the test results. Since the vibration transmission in a coupled system is not a simple series superposition, the method of calculating the transfer functions of each link in the transmission path and the coupling correction matrix faces the problem that each component is difficult to obtain, making it hard to achieve microvibration decoupling. To address this challenge, this paper proposes a semi-physical simulation method to solve the problem of microvibration test decoupling for the SC. Firstly, a coupled system of the Survey Camera-Microvibration Test System (SC-MVTS) is built, and at the same time, the FEM of the SC-MVTS coupled system is constructed. Modal tests and transmissibility tests are conducted on the SC-MVTS coupled system, and the model is iteratively modified based on the test data to make the simulation results as close as possible to the test data, ensuring that the dynamic characteristi…
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