青岛地铁减振降噪粘弹性阻尼材料及其约束阻尼结构研究
发布时间：2018-11-23 12:22
【摘要】：本文根据青岛地铁减振降噪要求，分析实际工程建立模型，对粘弹性阻尼材料及其约束阻尼结构的性能进行实验研究。分析归纳变化规律，为青岛地铁减振降噪提供理论支持。 对粘弹性阻尼材料的密度、凝胶时间、表干时间和实干时间、固含量、硬度、拉伸力学性能及动态力学分析（DMA）进行研究，从复合损耗因子、振动加速度、时域波形三个方面对粘弹性约束阻尼结构总结阻尼性能变化规律。主要结论如下： （1）所选粘弹性阻尼材料密度为0.9583g/cm3，凝胶时间、表干时间、实干时间分别为18min、42min、170min，固含量为93.95%；粘弹性阻尼材料养护14d后常规力学性能趋于稳定，，拉伸强度和断裂伸长率分别为8MPa和370%，硬度为邵A65。 （2）DMA研究结果说明所选粘弹性阻尼材料在1Hz~50Hz频率下的Tg为-20℃~20℃，损耗因子峰值均大于0.7。 （3）复合损耗因子研究结果表明，在设置的阻尼层厚度范围（0.5mm~2.5mm）内，复合损耗因子随阻尼层厚度的增加而增大，后趋于稳定值；在设置的约束力范围（40N~120N）内，约束力越大，即振动构件与阻尼层结合的越紧密，复合损耗因子越大。 （4）振动加速度级研究结果表明，在设置的阻尼层厚度范围（0.5mm~2.5mm）内，约束阻尼结构的振动加速度级值随阻尼层厚度的增加而降低；在设置的约束力范围（40N~120N）内，约束力越大，振动构件与阻尼层结合的越紧密，振动加速度级值越小。 （5）时域波形研究结果表明，在设置的阻尼层厚度范围（0.5mm~2.5mm）内，阻尼层厚度越大，约束阻尼结构振动时域指标有效值越小，时域指标最大值越小；随阻尼层厚度增加，约束阻尼结构振动衰减时间先降低，随后逐渐趋于稳定值；在设置的约束力范围（40N~120N）内，约束力越大，约束阻尼结构振动时域指标有效值越小，时域指标最大值越小，振动衰减时间先降低，随后逐渐趋于稳定值。 （6）所选粘弹性阻尼材料是一种是一种快速固化型、高固含量环保材料；在青岛地铁工程温度-10℃~20℃范围内阻尼性能达到最大值；在振动构件上附加2mm左右的粘弹性阻尼层可以提高5倍的阻尼效果。
[Abstract]:According to the requirements of vibration reduction and noise reduction of Qingdao Metro, the model of practical engineering is analyzed and the performance of viscoelastic damping material and its constrained damping structure is studied experimentally in this paper. Analysis and induction of the law of change, for Qingdao subway vibration and noise reduction to provide theoretical support. The density, gel time, surface drying time and dry time, solid content, hardness, tensile mechanical properties and dynamic mechanical analysis of viscoelastic damping materials were studied by (DMA). Three aspects of time domain waveforms are used to summarize the damping performance of viscoelastic constrained damping structures. The main conclusions are as follows: (1) the density of viscoelastic damping material is 0.9583g / cm ~ 3, gel time, surface drying time and dry time are 18 min ~ 42 min ~ 170 min, and the solid content is 93.95 min; The mechanical properties of viscoelastic damping materials tended to be stable after curing for 14 days. The tensile strength and elongation at break were 8MPa and 370, respectively, and the hardness was Shao A65. (2) the results of DMA study show that the Tg of the selected viscoelastic damping material is -20 鈩
本文编号：2351598
[Abstract]:According to the requirements of vibration reduction and noise reduction of Qingdao Metro, the model of practical engineering is analyzed and the performance of viscoelastic damping material and its constrained damping structure is studied experimentally in this paper. Analysis and induction of the law of change, for Qingdao subway vibration and noise reduction to provide theoretical support. The density, gel time, surface drying time and dry time, solid content, hardness, tensile mechanical properties and dynamic mechanical analysis of viscoelastic damping materials were studied by (DMA). Three aspects of time domain waveforms are used to summarize the damping performance of viscoelastic constrained damping structures. The main conclusions are as follows: (1) the density of viscoelastic damping material is 0.9583g / cm ~ 3, gel time, surface drying time and dry time are 18 min ~ 42 min ~ 170 min, and the solid content is 93.95 min; The mechanical properties of viscoelastic damping materials tended to be stable after curing for 14 days. The tensile strength and elongation at break were 8MPa and 370, respectively, and the hardness was Shao A65. (2) the results of DMA study show that the Tg of the selected viscoelastic damping material is -20 鈩
本文编号：2351598
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