Types and properties of sound-absorbing panels презентация

Use of measuring tools for determination of high quality product (on the example of sound-absorbing panels)

Vocabulary Determination – определение; sound-absorbing – звукопоглощение; flexible – гибкий; fluctuations – колебания; density – плотность;

SUBJECT: Types and properties of sound-absorbing panels Work purpose: To investigate tools for measurement of acoustic properties of material сomparing characteristics of different types of sound-absorbing panels and to choose high quality material.

Plan: 1) who and why used sound-absorbing panels 2) characteristics of sound-absorbing panels 3) types of the measuring tools helping to measure these characteristics 4) wide range of types 5) comparison according to characteristics by means of devices for measurement of acoustic space 6) choice of the best option 7) conclusion

1) The acoustic panels used to improvement of a sound absorption in rooms are demanded in case of arrangement of buildings and constructions of different function.

characteristic of some levels of volume of sound

Sound-absorbing materials are divided by nature of sound absorption on: panel materials and designs in which the sound absorption is caused by the active resistance of system porous with a firm skeleton in which the sound is absorbed as a result of viscous friction in a time porous with a flexible skeleton in which, except sharp friction in a time, there are relaxation losses connected with deformation of a nonrigid skeleton

sound-absorbing materials have sound absorption coefficient at least 0,4 with a frequency of 1000 Hz

Noise level also depends on reverberation time (time of sounding of the reflected signal).

speed of sound distribution in this panels is much less, than in dense materials with the high module of elasticity

Sound-absorbing materials are divided by structural indicators and size of relative compression

types of the measuring tools helping to measure these characteristics

wide range of types

comparative researches defined the winner - it is asbestos-cement acoustic baffles.

conclusion Using such measuring tools as audio-noise meters, frequency analyzers and tables of state standards to research acoustic properties of materials We revealed high quality sound-absorbing panels: asbestos-cement panel.