残渣板厚を含む波動ブラックホールを付与した自動車用吸音二重壁構造の減衰応答解析

抄録

Numerical analysis is performed to obtain damping responses for double wall structures inserted sound absorbing material. The base plate of the double wall structure has an acoustic black hole with residual thickness. The boundary at the opposite side of the black hole is fixed. This double wall structure and the acoustic black hole were modeled and numerically analyzed by FEM. Using the MSKE method proposed by Yamaguchi et al., we computed the vibration reduction and changes in vibration transmission of an acoustic black hole with residual thickness. By giving the residual thickness, in the lower frequency band, larger damping effects of the acoustic black hole for the base plate were obtained. However, less damping effects were appeared in the cover plate where no acoustic black hole exist.