夹层结构主动温控变阻尼振动控制技术

为提高夹层结构的抑振特性,开展了基于主动温控变阻尼技术的夹层结构振动控制方法研究。基于高分子聚合材料在玻璃化转变区的高阻尼特性,提出了一种针对夹层结构高分子聚合芯材进行温度控制,增大其损耗因子以提高结构阻尼的技术途径。根据此技术途径设计了以聚氨酯改性环氧材料为芯材,中间铺设加热膜的温控夹层梁。开展了不同控制温度下夹层梁的振动响应试验研究并探讨了温度对夹层梁弯曲刚度的影响规律,试验结果表明,当将夹层梁温度控制在玻璃化转变温度(Tg)左侧附近时,夹层梁的振动响应可较常温状态下降低8.85 dB,证明了所提出的主动温控变阻尼技术具有良好的抑振效果。

Active temperature controlled variable damping technology for sandwich structure

In order to improve the vibration suppression characteristics of sandwich structure, the research on the vibration control method of sandwich structure based on active temperature control variable damping technology was carried out. Based on the high damping property of the polymerized polymer in the glass transition zone, a technical approach to temperature control of the sandwich polymer material and increase its loss factor to improve the structural damping was proposed. According to this technical approach, a temperature-controlled sandwich beam with a polyurethane-modified epoxy material as the core material and a heating film in the middle was designed. The experimental study on the vibration response of sandwich beams under different control temperatures was carried out and the influence of temperature on the bending stiffness of sandwich beams was discussed. The experimental results show that the vibration response of the sandwich beam can be reduced by 8.85 dB compared with the normal temperature when the temperature of the sandwich beam is controlled near the left side of glass transition temperature(T_g). It is proved that the proposed active temperature-controlled variable damping technology has good vibration suppression effect.