Sentence examples for sound pressure reduction from inspiring English sources

It is found that approximately 45 dB sound pressure reduction is achieved by actuating a loudspeaker.

Measurements of dynamic stiffness, impact sound pressure reduction and thermal conductivity show that the developed concrete can be successfully used for thermal and acoustic insulating lightweight screeds to be applied above the concrete structural slabs in floors.

The results indicate that the sound reduction ratio has a quasi-periodic form that depends on the thickness of the back air space and the sound frequency, and a sound pressure reduction of approximately 80percentt (−14 dB) is observed around the minima.

Active controllers tend to be designed with a target on the sound pressure level reduction.

The control performance in terms of sound pressure level reduction, however, seems to be independent of the initial resonator-locations.

In the floating floor system the performance of resilient layers, in terms of impact sound pressure level reduction, is of paramount importance.

For non-dimensional frequencies f′ < 1, the resulting sound pressure level reduction (ΔSPL) was found to be a linear function of f′ and the ΔSPL depends only on the serration amplitude, serration wavelength and freestream velocity.

Experimental results in a normal room show that it can create a quiet zone larger than the size of a human head in the low-middle frequency, with a total sound pressure level reduction of more than 10 dB in the quiet zone.

The integrated streamwise vorticity modulus was found to be correlated with peak large scale turbulent mixing noise reduction, though optimal overall sound pressure level reductions did not necessarily follow due to the shock/fine scale mixing noise sources.

Sound pressure level reductions of up to 30 dB were achieved in an experimental duct system using a tunable Helmholtz resonator.

A maximum sound pressure level (SPL) reduction of 20 dB for the BPF component and 8 dB for the overall noise are observed under the tested working conditions, while the influence of the PMPP on the aerodynamic performance of the compressor is negligible.