论文部分内容阅读
本文以网络共聚物(蓖麻油/TDI+HEMA)为阻尼材料,对自由阻尼板作了噪声频谱分析,观察到在约千周以上频区,声压级较裸钢板有明显降低,对覆盖阻尼材料的钢条样品的内耗变频测量表明,内耗随频率而增加,说明自由阻尼板声压级的降低是由自身内耗随频率增大所引起。比较了线型聚合物聚碳酸脂后,提出将这一随频率增大内耗分为两部分:一部分为分子链弛豫过程的贡献,另一部分的内耗机制与分子链交联有关,可以用两端钉扎弦的阻尼共振型内耗定性解释。
In this paper, the noise spectrum analysis of the free damping plate was made with the network copolymer (castor oil / TDI + HEMA) as the damping material. It was observed that the sound pressure level was significantly lower than that of the bare steel plate in the frequency range of more than a thousand weeks, The internal friction frequency of the material steel strip samples shows that the internal friction increases with the frequency, indicating that the decrease of the sound pressure level of the free damping plate is caused by the increase of internal friction due to its own internal frequency. After comparing linear polymer polycarbonate, it is proposed that this internal friction with increasing frequency be divided into two parts: one part contributes to the relaxation process of the molecular chain and the other part relates to the internal friction mechanism related to the molecular chain crosslinking, Damping Resonance Type Internal Constructive Interpretation of Pinned Strings.