As absorption of sound of lower frequencies is quite problematic with fibrous material
made up of coarser fibers, development of highly efficient sound absorption material is called for.
This is why this work deals with the development of new high sound absorption material. To absorb
the low frequencies, especially the structures based on resonance principle of nanofibrous layers are
used, when through resonance of some elements the acoustic energy is transferred into thermal energy.
The goal of the invention is achieved by a sound absorbing means which contains resonance membrane formed by a layer
of polymeric nanofibers, which is attached to a frame. For production of nanofibrous membranes, the cord electrospinning
was used. The resonance membrane was then, upon impact of sound waves of low frequency, brought into forced vibrations,
whereby the kinetic energy of the membrane was converted into thermal energy by friction of individual nanofibers,
by the friction of the membrane with ambient air and possibly with other layers of material arranged in its proximity, and
some of the energy was also transmitted to the frame, through which the vibrations of the resonance membrane were
damped. The density and shape of the mesh of frame formations determine the resonance frequency of the acoustic means.
The goal of the invention is therefore to eliminate or at least reduce the disadvantages of the present state of the art and to
propose sound absorbing means that would be capable of absorbing, with good results sounds in as broadest frequency
range as possible. Here, we also discussed some patents relevant to the topic.
Keywords: Absorption, acoustics, electrostatic, frame, frequency, grid, membrane, mesh, nanofibres, panel, resonance, sound,
spinning, structure, vibration.
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