System for determining an interior or exterior acoustic noise level of an enclosed structure and noise reduction device incorporating such system
US5642445A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1995 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | Oct 31, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H3/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The acoustic noise monitor determines acoustic sound levels radiated or stered to an exterior or interior fluid space of a structure such as an enclosed structure by measuring a condition, such as strain level, of the structure itself rather than by directly measuring the fluid itself. From the strain or other condition measured on the structure, the acoustic sound levels can be calculated with the Helmholtz integral. The sensors on the structure are preferably spaced so that non-radiating high wave-number motions of the structure are averaged out. The acoustic noise monitor can be used with submarines, jet aircraft, cars, or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.