To address the challenges of high complexity and computational costs in simulating satellite structures with body-centered cubic(BCC) lattice fills,an equivalent modeling approach was proposed. A mechanics equivalent model for lattice core sandwich panels was established using Timoshenko beam theory and sandwich theory, and a strut length correction parameter was introduced to improve the accuracy. Simulation and experimental results show that under constrained modal conditions, the equivalent model reduces the number of mesh elements to 0.48% of the original, with a maximum error in the first six natural frequencies of no more than 5.60%, while maintaining consistent mode shapes. Satellite dynamic analysis further confirmed the effectiveness of the equivalent model in global modal analysis and harmonic response analysis. The method significantly reduces modeling difficulty and computational costs, and provides reliable technical support for the design of batch-produced satellite lattice structures.
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