Index Method of Assessment of the Acoustical Climate in Industrial Rooms

International Journal of Occupational Safety and Ergonomics

Kosała

2013

Self Cite

The inversion method was used to test vibroacoustic processes in large-size machines used in opencast mines of rock material. When this method is used, the tested machine is replaced with a set of substitute sources, whose acoustic parameters are determined on the basis of sound pressure levels and phase shift angles of acoustic signals, measured with an array of 24 microphones. This article presents test results of a combine unit comprising a crusher and a vibrating sieve, for which an acoustic model of 7 substitute sources was developed with the inversion method.

Section: Inversion Methodsmentioning

confidence: 99%

“…Figure 1 shows the inversion method used to determine parameters of a model. Sound pressure at the observation points marked in Figure 1 as A can be determined on the basis of the inversion method with Equation 1 [10,11,12,13]:…”

Section: Inversion Methodsmentioning

confidence: 99%

The Inversion Method in Measuring Noise Emitted by Machines in Opencast Mines of Rock Material

Pleban

International Journal of Occupational Safety and Ergonomics

Kosała

2013

Self Cite

“…Inverse methods usually consist in creating an acoustic model and replacing the actual sound emitting source with a set of elementary sound sources. Then the acoustic parameters of these sources are simulated to obtain a sound field distribution produced by this system of substitute sources, which is as close as possible to the sound field distribution around the actual sound source [6,7,8].…”

Section: Determining Acoustic Impedance With the Inverse Methods In Situmentioning

confidence: 99%

Estimating Surface Acoustic Impedance With the Inverse Method

International Journal of Occupational Safety and Ergonomics

2011

Self Cite

“…The idea of inverse method implementation in room acoustics consists in the fact that it is possible to recover parameters of the analyzed room area if one knows the transfer function or the propagation model connecting the acoustic eld with parameters of the volume boundary [1]. The inverse formulation of the problem in acoustics means that the acoustic parameters of the model, e.g.…”

Section: Introductionmentioning

confidence: 99%

Determination of Acoustic Impedance of Walls Based on Acoustic Field Parameter Values Measured in the Room

Czajka

2013

Acta Phys. Pol. A

Acoustic eld in enclosed rooms in the low frequency range can be described by the wave model, based on solution of the wave equation. Solution to the wave equation for acoustic eld in the room can be obtained using numerical procedures, e.g. the boundary elements method. Determination of acoustic impedance of the room walls surface material, based on the knowledge of the distribution of acoustic pressure amplitudes in the enclosed space, requires application of the inverse boundary elements method and gathering a proper set of input data. The paper presents the possibilities of analysis of acoustic properties for industrial-type rooms, by using inverse methods in the low frequency range.