Abstract All-metallic sandwich panels with lattice truss cores are typically ultralight, stiff and strong, yet poor in passive vibration damping. Novel laser-welded corrugated-core (LASCOR) sandwich panels with polyurea-metal laminates (PML) as face sheets were proposed and fabricated, and their vibration and damping characteristics were systematically investigated, both experimentally and numerically. Frequency/time response curves, natural frequencies, vibration mode shapes and damping loss factors were measured and compared with LASCOR sandwich panels without embedded polyurea layers. A combined finite element-modal strain energy (FE-MSE) method was proposed to predict the vibration damping performance and explore the underlying enhancement mechanisms, with the frequency-dependent damping behaviors of polyurea considered. Good agreement was achieved between numerical simulations and experimental measurements. The PML face sheets enabled remarkable damping enhancement, due mainly to viscoelastic energy dissipation of the polyurea layers. The capacity of the sandwich panel in passive vibration suppression could be further improved by tailoring the polyurea layer thickness and the distribution of polyurea layers.

中文翻译：

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具有聚脲金属层压板面板的新型波纹夹芯板的增强振动和阻尼特性

摘要 具有格子桁架芯的全金属夹芯板通常超轻、坚硬、坚固，但被动减振能力较差。提出并制造了以聚脲金属层压板 (PML) 作为面板的新型激光焊接波纹芯 (LASCOR) 夹芯板，并通过实验和数值方法系统地研究了它们的振动和阻尼特性。测量频率/时间响应曲线、固有频率、振动模式形状和阻尼损耗因子，并与没有嵌入聚脲层的 LASCOR 夹芯板进行比较。提出了一种组合有限元-模态应变能 (FE-MSE) 方法来预测振动阻尼性能并探索潜在的增强机制，同时考虑了聚脲的频率相关阻尼行为。数值模拟和实验测量之间取得了良好的一致性。PML 面板实现了显着的阻尼增强，主要是由于聚脲层的粘弹性能量耗散。通过调整聚脲层的厚度和聚脲层的分布，可以进一步提高夹层板的被动振动抑制能力。