发明名称 |
SOUND BARRIER FOR AUDIBLE ACOUSTIC FREQUENCY MANAGEMENT |
摘要 |
<p>A sound barrier comprises a substantially periodic array of structures disposed in a first medium having a first density, the structures being made of a second medium having a second density different from the first density, wherein one of the first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, the speed of propagation of longitudinal sound wave being at least about 30 times the speed of propagation of transverse sound wave, and wherein the other of the first and second media is a viscoelastic or elastic medium.</p> |
申请公布号 |
EP2232482(B1) |
申请公布日期 |
2014.03.19 |
申请号 |
EP20080868963 |
申请日期 |
2008.12.16 |
申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
BERKER, ALI;GREGER, RICHARD W.;JAIN, MANISH;ALOSHYNA EP LESUFFLEUR, MARIE;MOHANTY, SANAT |
分类号 |
G10K11/165 |
主分类号 |
G10K11/165 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|