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

Claim 18:
19. A sound absorbing structure comprising:
a resonator structure for receiving sound or vibration;
means to create a reflection with a pi phase factor;
means for establishing a resonance of the received sound or vibration and for providing diminished reflection, through absorption or scattering effects
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, wherein the soft boundary cooperates 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.