Description of the effective soundproofing panel is presented. For this panel, the ratio of acoustic characteristics and surface density exceeds many modern sound insulation and sound absorbing materials and structures. This article is devoted to modeling the sound absorption coefficient of the soundproof panel. The article presents formulas for determining the coefficient of sound absorption. Construction of a sound suppressed lightweight structured panel (SSLSP) developed by the authors is shown. Comparison of the effectiveness of the SSLSP panel and modern sound-proof materials is shown.
The article presents SSLWSP panels, the feature of which is a small weight and good soundproofing properties. The article acquired the model of sound insulation for SSLWSP panels. The modeling of sound insulation is based on the sound-permeability model of thin iso-tropic sheet material, from which SSLWSP panels are made. An experimental verification of the obtained sound insulation model showed the convergence of experimental and theoretical values. The best convergence of theoretical and experimental data falls on the frequencies corresponding to a speech range.
The design of an auscultation device with a mechanical sonic flow densifier is presented. The relationship associating the sonic flow amplification level with the auscultation device dimensions is obtained.
The article notes that occupational safety in industry largely depends on the working equipment reliability. Among the various methods of maintaining equipment operability, there is a diagnostic method that helps to identify hidden defects before they appear. Thanks to equipment diagnostics, it is possible to increase safety, avoid accidents, catastrophes, and minimize repair and operation costs. There are two types of diagnostic methods: contact and non-contact. The most efficient non-contact methods are acoustic methods that are not associated with the destruction of the equipment under study. The possibility of applying the methods of auscultation used in medicine for diagnosing the state of industrial equipment is shown. Various methods and devices of auscultation are considered. The advantages and disadvantages of currently existing auscultation devices are noted. The design of an auscultation device with a mechanical sound flux seal is presented. Mechanical sealing of the sound flux is based on the parabolic reflectors use. The efficiency of using parabolic reflective surfaces is shown. A relationship is obtained that relates the magnitude of the amplification of the sound flux with the dimensions of the auscultation device. The results of calculations of the increase in the sound level in the auscultation device show that even with a sufficiently small ratio of the diameter of the inlet for the sound flux to the diameter of the outlet cross section of the sound flux and the diameter of the reduced parabolic reflector, a noticeable increase in the sound level is obtained when using a mechanical amplifier of the sound flux in the auscultation device.
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