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<p>Accurate equivalent modeling of large space truss structures (LSTSs) is important for dynamic analysis, structural design, and vibration-oriented applications. However, many existing equivalent models still idealize mechanical joints and neglect their finite dimensions and complete parameter set, which can reduce predictive fidelity. This paper proposes a joint-explicit dynamic Equivalent Beam Model (EBM) for LSTSs within a consistent energy-equivalence framework. The model explicitly accounts for joint mass/inertia, finite joint length, and six-degree-of-freedom stiffness, thereby establishing a parameter-transparent continuum surrogate that directly links joint-level properties to global dynamics. The proposed EBM is validated against a high-fidelity FEM under free-free and clamped-free boundary conditions, and is further assessed by a preliminary modal test on a 16&#xa0;m cantilever truss. For the baseline joint configuration, the maximum deviation from FEM is below 4%; when all joint stiffness coefficients are reduced to 10% of the baseline values, the deviations remain below 10% for all listed modes. In the experimental validation, the predicted first three bending frequencies remain within 8% of the measured results. The results further show that joint tensile stiffness mainly affects lower-order transverse modes, whereas joint bending stiffness becomes increasingly influential for higher-order modes. Joint length also becomes important when its stiffness per unit length differs significantly from that of adjacent members.</p>

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Consistent dynamic equivalence and parameter influence analysis of large space truss structures with explicit joint properties

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Jinfeng Deng,
  • Yongjun Lei,
  • Dongxu Li,
  • Shiyao Zhu

摘要

Accurate equivalent modeling of large space truss structures (LSTSs) is important for dynamic analysis, structural design, and vibration-oriented applications. However, many existing equivalent models still idealize mechanical joints and neglect their finite dimensions and complete parameter set, which can reduce predictive fidelity. This paper proposes a joint-explicit dynamic Equivalent Beam Model (EBM) for LSTSs within a consistent energy-equivalence framework. The model explicitly accounts for joint mass/inertia, finite joint length, and six-degree-of-freedom stiffness, thereby establishing a parameter-transparent continuum surrogate that directly links joint-level properties to global dynamics. The proposed EBM is validated against a high-fidelity FEM under free-free and clamped-free boundary conditions, and is further assessed by a preliminary modal test on a 16 m cantilever truss. For the baseline joint configuration, the maximum deviation from FEM is below 4%; when all joint stiffness coefficients are reduced to 10% of the baseline values, the deviations remain below 10% for all listed modes. In the experimental validation, the predicted first three bending frequencies remain within 8% of the measured results. The results further show that joint tensile stiffness mainly affects lower-order transverse modes, whereas joint bending stiffness becomes increasingly influential for higher-order modes. Joint length also becomes important when its stiffness per unit length differs significantly from that of adjacent members.