Patent ID: 11905703
Assignee: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A soft boundary structure comprising:
a resonator structure capable of receiving sound or vibration, establishing resonances coupled with received sound or vibration, and creating a reflection with a pi phase factor;
a structure having a restricted top plate, a plurality of open sidewalls and a restricted backwall, the structure configured to create an area change by using the open sidewalls; and
a soft boundary located on or closely adjacent the resonator structure, the soft boundary cooperating with the resonator structure to attenuate the sound or vibration,
wherein the open sidewalls cause incident sound waves engaging the structure to turn and pass at least a subset of the plurality of sidewalls,
and wherein incident sound waves encounter an increase of cross-sectional area, which results in a soft boundary condition, effecting constructive interference between reflected and original waves.