초록 ▼

The acoustic noise monitor determines acoustic sound levels radiated or scattered 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 s

The acoustic noise monitor determines acoustic sound levels radiated or scattered 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.

대표청구항 ▼

A system for determining a sound level at a location in an interior or exterior fluid space of a structure, the system comprising: sensing means for sensing a condition of the structure at a plurality of locations on the structure and for producing a plurality of outputs representing the condition a

A system for determining a sound level at a location in an interior or exterior fluid space of a structure, the system comprising: sensing means for sensing a condition of the structure at a plurality of locations on the structure and for producing a plurality of outputs representing the condition at the plurality of locations; and calculating means for receiving the plurality of outputs and for calculating, on the basis of the plurality of outputs, the sound level at said location in the interior or exterior fluid space, wherein said calculating means comprises: Fourier transform means for receiving the plurality of outputs and for producing Fourier transformed outputs from the plurality of outputs; system solving means for receiving the Fourier transformed outputs and for calculating displacement components from the Fourier transformed outputs; and Helmholtz calculating means for receiving the displacement components and for calculating the sound level at said location in the interior or exterior fluid space from the displacement components.