轻质复合阻尼覆盖层的参数分析及设计

Parameter Analysis and Design of Lightweight Composite Damping Layer

在水面舰艇上应用轻质复合阻尼覆盖层可以降低阻尼覆盖层重量对舰船载重量的影响。阻尼覆盖层的各层结构参数和材料参数的选用对其减振性能及面密度有十分重要的意义,为了使该轻质复合阻尼覆盖层铺设在水面舰艇上时具有良好的阻尼性能,同时具有较低的面密度,利用复刚度法推导出复合阻尼结构损耗因子的表达式,然后得到阻尼覆盖层各层参数对阻尼复合结构的减振特性影响规律,并计算了几种不同的复合阻尼结构的损耗因子以及面密度。结果表明,在轻质复合阻尼覆盖层的设计过程中,黏弹性层的杨氏模量不宜过小,而垫高层的杨氏模量不宜过大,黏弹性层和垫高层的厚度应该接近。通过合理的参数设计,可设计出面密度较小且阻尼性能良好的复合阻尼覆盖层,可在舰船上大面积铺设。

The application of lightweight composite damping layer can reduce the influence of damping layer weight on the ship deadweight. The selection of structural parameter and material parameter of each damping layer has large influence on its anti-vibration performance and areal density. In order to make the lightweight composite damping layer have excellent damping performance on the surface vessel and have lower areal density, this study derives the expression for composite damping structure dissipation factor by using the complex stiffness method. As a result, the influence of layer parameters of each layer on the anti-vibration characteristics is obtained and several different composite damping structure dissipation factors and areal densities are calculated. The result shows that during the design of lightweight composite damping layer, the Young＇s modulus should not be too small in the viscoelastic layer, but should not be too large in the stand-off layer, meanwhile the thickness of viscoelastic and stand-off layers should be close. Through proper parametrical design, the composite damping layer may have low areal density and excellent performance, suitable for wide application on ships.