RU2015130891A - SPHERICAL PIECE SOUND MISSILES FOR MOBILE VEHICLES - Google Patents

Claims (7)

1. Piece spherical sound absorber for mobile vehicles, containing active and jet type sound absorbers placed on a rigid frame, characterized in that the frame is made of two parts, while the lower, reactive part is made in the form of a spherical shape with an internal congruent spherical resonant a cavity formed by a rigid continuous spherical shell, an equidistant external perforated spherical shell connected to the upper, active part, which is made in in the form of a rigid perforated cylindrical shell with a perforated lid and a solid base, the cavity of the cylindrical shell is filled with sound-absorbing material, and the upper and lower parts of the sound absorber are connected by means of an elastic damping element that allows damping high-frequency vibrations, while the perforated cover of the perforated cylindrical shell is secured with a hinge with the help of which the frame is attached to the desired object, for example, the ceiling of a production of the room, and the spherical resonance cavity of the reactive part of the frame is rigidly connected by at least one sleeve with an axial hole that serves as the neck of the Helmholtz resonator, with an external perforated spherical shell, and the space between them is filled with a sound absorber, while around the perforated cylindrical shell is located, at least one helical sound-absorbing element made in the form of a cylindrical helical spring spanning the shell. 2. Piece spherical sound absorber for mobile vehicles according to claim 1, characterized in that the screw sound-absorbing element is made in the form of a hollow screw sound-absorbing element formed by the outer and inner helical surfaces forming a cavity, while the space formed by the outer and inner helical surfaces is filled sound-absorbing material with a density lower than that of a screw sound-absorbing element. 3. A piece spherical sound absorber for mobile vehicles according to claim 1, characterized in that the perforated surfaces have the following perforation parameters: hole diameter - 3 ÷ 7 mm, perforation percentage 10% ÷ 15%, and holes in the perforated surfaces can be made in in the form of holes of a round, triangular, square, rectangular or rhomboid profile, while in the case of non-circular holes, the maximum diameter of a circle inscribed in a polygon should be considered as a conditional diameter, and as of the material of the perforated surfaces, structural materials are applied with a layer of soft vibration-damping material, for example, VD-17 mastic or “Gerlen-D” type material applied to their surface on one or two sides, and the ratio between the thicknesses of the material and the vibration-damping coating lies in the optimal range of values : 1 / (2.5 ... 3.5), or stainless steel, or galvanized sheet 0.7 mm thick with a polymeric protective and decorative coating of the Pural type 50 microns thick, or Polyester 25 microns thick, or aluminum l hundred thickness of 1.0 mm and a coating thickness of 25 microns, or from solid, ornamental vibration-damping materials, for example plastic such as "agate", "Antivibrit", "Shvim". 4. A piece spherical sound absorber for mobile vehicles according to claim 1, characterized in that as sound absorbing material, slabs made of rockwool basalt mineral wool or URSA mineral wool or P-75 basalt wool are used as sound absorbing material. , or glass wool with glass fiber lining, and the sound-absorbing element over its entire surface is lined with an acoustically transparent material, such as fiberglass type EZ-100 or polymer type "poviden". 5. A piece spherical sound absorber according to claim 1, characterized in that a porous noise-absorbing material, for example, foam aluminum or cermet or a stone shell with a degree of porosity in the range of optimal values: 30 ÷ 45%, or metal foam, is used as sound-absorbing material. or material in the form of compressed crumb from solid vibration-damping materials, for example elastomer, polyurethane, or plastic compound such as Agate, Anti-Vibrate, Shvim, and the size of the fractions of the crumb lies in the optimum value range: 0.3 ... 2.5 mm, and also porous mineral piece materials, for example pumice, vermiculite, kaolin, slag with cement or other binder, or synthetic fibers can be used, while the surface of the fibrous absorbers is treated with special porous paints, air-passing, for example, type "Acutex T" or covered with breathable fabrics or non-woven materials, such as "Lutrasil." 6. The piece spherical sound absorber according to claim 1, characterized in that a heat-resistant highly porous fibrous heat-insulating and sound-absorbing material made of a mineral filler in the form of fibers of silicon dioxide, a binder, sintering additive, which is used as amorphous boron or nitride, is used as a sound-absorbing material. boron, and a surfactant, while silica fiber having a diameter of 4-10 μm, as a binder and about neous surfactant used in an aqueous solution of one of the substances selected from the group consisting of methyl cellulose, carboxymethyl cellulose or carboxymethyl starch, the content is 2-5 wt. %, and additionally the material contains silica in the following ratio of components, wt. %: Silica fiber with a diameter of 4-10 microns 75.0-93.0 Amorphous boron or boron nitride 0.2-0.5 Silica sol 7.0-25.0