Free Vibration Characteristics of Ultra-high Molecular Weight Polyethylene Reinforced Corrugated Sandwich Structure
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摘要: 金属波纹夹芯结构因超轻、结构性能好(比刚度/强度)、主动冷却能力强、易于制造和维修等诸多优点被广泛应用于高铁、船舶、建筑等领域,然而其阻尼特性较差,在外部载荷激励下容易产生结构振动和噪声。为了提高金属波纹夹芯结构的振动阻尼特性,且同时增强夹芯结构的承载能力,本研究提出采用超高分子量聚乙烯增强金属波纹夹芯结构,并通过试验模态法分析自由层和约束层两种不同增强方式对波纹夹芯结构固有频率和结构阻尼特性的影响。结果表明,自由层和约束层超高分子量聚乙烯增强的金属波纹夹芯结构相比于全金属波纹夹芯结构,阻尼特性得到显著提高。Abstract: Corrugated metal sandwich structures are widely used in high-speed railways, ships, and buildings due to their numerous advantages such as ultra-lightweight, good structural properties (specific stiffness/strength), strong active cooling capacity, and convenience in fabrication and maintenance, etc. However, due to their poor damping characteristics, structural vibration and noise are easily generated under external load excitation. In order to improve the vibration damping characteristics of the corrugated metal sandwich structure and enhance the bearing capacity of the sandwich structure at the same time, we propose the ultra-high molecular weight polyethylene (UHMWPE) to strengthen the corrugated metal sandwich structure, and analyze the effects of the free layer and constrained layer strengthening methods, on the natural frequency and structural damping characteristics of the corrugated sandwich structure. The results show that the damping characteristics of the metal corrugated sandwich structure reinforced with the free and constrained layers of UHMWPE are significantly improved compared with that of the all-metal corrugated sandwich structure.
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