Magnetic shielding theory modeling and vibration characteristics of body-centered cubic lattice sandwich cylindrical shell

Abstract With the rapid advancement of aerospace technology, traditional thin-shell structures made of multilayer iron-nickel alloys struggle to meet the demanding requirements for both magnetic shielding performance and vibration resistance. To address this issue, a magnetic shielding theory and vibration characteristics approach based on a body-centered cubic (BCC) lattice sandwich cylindrical shell is proposed. First, a theoretical model for the magnetic shielding effectiveness of the BCC lattice sandwich cylindrical shell was derived. Subsequently, through numerical calculations and experiments, the influence of vibration characteristics and structural parameters on magnetic shielding performance was investigated. The results show that the first-order natural frequency increased by 33.25% compared to the traditional double-layer structure, with a magnetic shielding effectiveness of 41 dB achieved in the shielded region. The variation trend of the magnetic flux density aligned well with the theoretical predictions, confirming the accuracy of the theoretical model. This study provides a novel approach to the vibration-resistant design of magnetic shielding structures for satellites.