| 초록 |
Engine encapsulation(E/Cap) is an automotive external parts that has the advantage that it preserves heat in the engine room to enable rapid warm-up of the engine and transmission, thereby contributing to improved fuel economy. Generally, the composition of E/Cap materials consists of a two-layer construction of PU + Felt. In this study, we studied the oneset PU aerogel absorbing materials for the purpose of reducing cost and improving insulation performance by changing from the two-layer configuration of PU+ Felt to the one-layer configuration of the PU+aerogel. Silica aerogel is a super insulation and lightweight material. For this reason, PU aerogel sound absorbing material was developed by impregnating PU foam with a silica aerogel material. In addition, thermal properties of PU sound absorbing material were confirmed by using thermal conductivity meter and TGA according to the aerogel contents, and surface and acoustic characteristics were confirmed using SEM and Impeadance tube. |
