Kochetov wall resonant panel

FIELD: machine engineering.

SUBSTANCE: wall resonant panel comprises perforated and smooth surfaces, between which there is a sound-absorbing composite layer of complex shape. The latter is an alternation of continuous and hollow sections with a frame made of a rigid sound-absorbing material based on aluminium containing alloys. Hollow sections are formed by prismatic surfaces having in cross-section parallel to the drawing plane, the shape of a parallelogram. Internal parallelogram surfaces have a toothed structure. The teeth tops are directed inward the prismatic surfaces. The edges of the prismatic surfaces are fixed respectively on the perforated and smooth surfaces. The cavities formed by perforated and smooth surfaces between which a sound-absorbing composite layer of complex shape is located, are filled with soft absorbing material of mineral wool on the basis of basalt or basalt wool, or glass wool lined with glass felt. The inner surface of the perforated surface that faces direction of the sound-absorbing material is lined with acoustically transparent material such as fiberglass. The hollow section cavities formed by prismatic surfaces are fiiled with polymer foam and coupled by resonant cavities with openings formed by perforated and smooth surfaces, between which there is a sound-absorbing composite layer of complex shape.

EFFECT: improved noise suppression and structure reliability as a whole.

1 dwg



Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to stiff viscoelastic materials to be used for damping and noise killing in machine building, construction, etc. Proposed material is made of hardened damping graphite-bearing putty. Invention relates also to the method for reduction of structure vibration and noise with application of above described material.

EFFECT: better insulating properties, unlimited shelf life.

9 cl, 1 tbl

FIELD: transport.

SUBSTANCE: set of inventions relates to transport engineering. Sound-insulating part of trim contains one area with predominantly sound-absorbing characteristics - absorbing area. The absorbing area contains one porous fibrous layer and one other area with mass-spring acoustic characteristics - insulating area. The insulating area consists of mass layer and separating layer. The mass layer consists of impermeable protective layer and the same porous fibrous layer as the absorbing area in the insulating area regulated according to Young's modulus (Pa): 96·AW·t, where AW is specific weight (g/m2), t is width (mm) of porous fibrous layer. Impermeable thin protective layer is located between porous fibrous layer and separating layer, and all the layers are couched together. Thickness of porous fibrous layer in absorbing area is greater than thickness of the same layer in insulating area. The mentioned sound-absorbing part of trim is used in automobile part such as inner panel, floor covering or wheel insert in a vehicle, for instance in passenger car or truck.

EFFECT: lower noise in a vehicle.

9 cl, 11 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Said part comprises at least one insulating area with noise absorbing properties of the mass-spring type. Said area includes at least one ply with mass and decoupling play abutting on the latter. Note here that ply with mass consists of porous fibrous play and barrier ply. Said barrier ply is arranged between porous fibrous ply and decoupling ply while all plies are coupled to make a sandwiched structure. Note also that porous fibrous ply in at least insulating area has dynamic lengthwise elasticity modulus set to radiation frequency equal to at least 3000 Hz. Said part can be incorporated with noise insulator or with that combined with absorber.

EFFECT: efficient noise killing.

10 cl, 8 dwg

FIELD: physics, acoustics.

SUBSTANCE: invention relates to means of reducing acoustic noise. A noise-absorbing module comprises a closed separate vessel formed by walls of a pressure shell made of structural acoustic materials in which a porous sound-absorbing substance is placed, represented by separate crushed fragmented sound-absorbing elements made from wastes in the form of crushed porous sound-absorbing components dismantled from recyclable man-made objects. The universal membrane-type noise-absorbing module is characterised by given geometrical, weight and size, structural and physical parameters of component elements thereof, is primarily characterised by regular geometric shapes of volumetric cavity elements formed by a bearing flat or moulded non-flat base, the peripheral flanging part of which is mated with an elastic sound-absorbing membrane with zero clearance using an adhesive bond. The cavities of the closed separate vessels contain separate crushed sound-absorbing elements, volumes of which are primarily in the range Vf=4.2×(10-9…10-2) m3, the filling density of the cavity of the closed formed separate vessel ρf=10…655 kg/m3.

EFFECT: improved noise-absorption.

17 cl, 38 dwg

FIELD: transport.

SUBSTANCE: group of invention relates to sound-proofing device to be arranged between car body sheet (12) and inner lining web (14), to car cabin lining and to car. Proposed device comprises plate (20) of foamed material based on polymer impregnated with the mix of mineral filler and organic binder. Plate (20) of foamed material is intended for tight contact with body sheet (12) and inner lining web (14). Car body inner lining system comprises inner lining web (14) to cover car body sheet (12) and above described device. Car incorporates said system.

EFFECT: ease of assembly, decreased weight and lower costs.

25 cl, 5 dwg

FIELD: physics, acoustics.

SUBSTANCE: group of inventions relates to acoustics and aviation engineering and is intended for use as a sound-absorbing panel. The sound-absorbing panel for an ejector nozzle has an external skin containing sound-absorbing holes, an internal skin, a sound-absorbing structure having a cellular core situated between the internal skin and the external skin. At least one main component selected from the external skin, the internal skin and the sound-absorbing structure is formed by a composite material and the sound-absorbing structure is in contact with at least one of the internal skin and the external skin by compression using elastic means. At least part of the elastic means includes at least one fibrous element which completes the sound-absorbing structure and is able to compress in thickness, wherein the fibrous element is made of material selected from heat-resistant graphite and carbon felts integrating porosity of the felt, tortuosity of the fibres, aspect ratio, average size of the fibres and/or an entanglement rate, dampers which are a continuation of the wall of at least part of the elements with a cellular core of the sound-absorbing structure, or a coil spring able to apply pressure on the sound-absorbing structure such that said structure is in contact with the external skin. The sound-absorbing panel is part of the ejector nozzle and the body.

EFFECT: high strength of the structure.

9 cl, 9 dwg

FIELD: machine building.

SUBSTANCE: module comprises an external acoustically transparent envelope featuring one- or multi-layer version made of metal or polymer material or from a combined laminated structure of dissimilar structural materials shaping a closed formed independent vessel with the porous sound-absorbing material placed into the inner cavity. A form of the external acoustically transparent envelope is presented primarily in regular geometrical figures of volumetric cavity elements, a thickness of the wall of the external acoustically transparent envelope does not exceed 3 mm, its structural construction material corresponds primarily to a continuous air-tight layer of elastic polymer film or metal foil or air-blasted perforated layer of elastic polymer film or metal foil or air-blasted fibrous layer of non-woven fabric or woven fabric, or a perforated layer of metal or polymer material, or the combined multi-layer combined conjunctions thereof. A volume of every stand-alone fractured sound-absorbing element is located primarily in a range of Vf=4.2×(10-9…10-2) m3, while a density of filling a cavity of the closed formed stand-alone vessel amounts to ρf=10…655 kg/m3.

EFFECT: improving acoustic convenience due to improved noise-suppressing efficiency in the extended frequency range.

33 cl, 47 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to the structure with cellular filler for application in aircraft turbojet nacelle bearing panel that makes an acoustic panel. The structure comprises the block with cellular filler including central part containing mid cellular cells and two lateral parts, each including multiple cellular cells. One part of connection cellular cells has one extra wall to make a connection. Block or blocks are interconnected by one connection zone produced by punching two overlapped extra walls of connection cellular cells pertaining to different lateral parts.

EFFECT: simplified production of connection zone, reliable joint.

13 cl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to transport engineering. integral noise-killing module is composed by battery of acoustic resonators integrated with standard devices. Said battery consists of acoustic resonators and/or volume expansion chambers. Open necks of the latter are communicated with the underhood space. Said battery features the following overall dimensions: length L, width B and height H. Said dimensions are composed by standard parts, that is, hood, front board and wheels mud flaps, front bumper, engine room bottom shield, i.e. engine mud flap, frame, grate, cooling system fan case and facing. Said parts make the engine room front upper and lower vent openings. Battery of acoustic resonators is composed by quarter-wave acoustic resonators and/or half-wave acoustic resonators and/or Helmholtz resonators and/or expansion chambers. Frequencies of oscillations used by said resonators fR equal or differ from those of lower acoustic modes fmL, fmB, fmH of engine room space by not over 1.2 times. Overall dimensions and expansion chamber cavities ratio multiple thereof are not equal and are not multiple of overall dimensions and engine room L:B:H ratio multiple thereof. Mutual radio of expansion chambers sizes and those of said spaces multiple thereof differ by at least 1.2 times.

EFFECT: lower noise.

21 cl, 35 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medicine. In method realisation synchronous registration of chest surface oscillations is carried out by means of two sensors, one of which registers oscillation displacement, the other one registers dynamic force on the surface of chest. Responses of sensors are processed by differentiation of response of oscillation displacement sensor to response, proportional to oscillation rate, formation of responses of oscillation rate and dynamic force to their amplitude maximums, calculation of complex mutual spectrum between normalised responses of oscillation rate and dynamic force and determination of material part of complex mutual spectrum of said responses. Registration of oscillations is performed by combined receiver, which contains case, rigid stethoscopic nozzle of conic profile, two sensors and unit of processing. One of sensors represents microphone, installed in nozzle throat. Second sensor is a circular longitudinally deformable piezotransducer, installed on the bottom of stethoscopic nozzle. Back side of piezotransducer is loaded with circular massive overlay, which provides access to microphone and fixed to receiver case. Overlay and receiver case are separated from mechanical contact with stethoscopic nozzle. Unit of processing includes differentiating device, switched to microphone outlet, with outlet of differentiating device being switched to first inlet of calculator of mutual spectrum, to second inlet of which piezotransducer electrodes are switched.

EFFECT: invention makes it possible to increase noise-protectiveness of registration of respiratory sounds on person's chest surface, that is to increase reliability of obtained diagnostic information due to simultaneous suppression of acoustic noise and contact vibration effects.

2 cl, 3 dwg

FIELD: construction.

SUBSTANCE: sound-absorbing element includes perforated surfaces, between which a sound-absorbing structure is arranged and consists of three layers of sound-absorbing material. The first layer, which is a stiffer one, is solid and shaped and fixed on upper perforated surface. The second layer, which is a softer one than the first layer is discontinuous and located in focus of sound reflecting surfaces of the first layer. The discontinuous sound absorbing layer located in focus of a solid shaped layer is made in the form of rotation bodies, for example in the form of balls, and attached by means of rods parallel to upper and lower perforated surfaces, which are rigidly attached to the upper perforated surface by means of vertical fasteners perpendicular to them, for example in the form of plates, one end of which is rigidly fixed on the upper perforated surface, and the other one is made in the form of a clamp enveloping the rod and tightening it by means of a screw.

EFFECT: improving noise control efficiency and reliability of the structure as a whole.

5 cl, 1 dwg

FIELD: machine building.

SUBSTANCE: invention relates to safe working facilities. An acoustic cabin comprises a base, a frame, life support equipment, window and door apertures and enclosures in the form of acoustic panels. The base is mounted on at least three pneumatic vibration isolators made as a rubber cord shell, and a cabin frame in the form of acoustic sound absorbing panels of parallelepiped shape is rigidly attached to the base, the parallelepiped is formed by the front and back walls of the panel with sound absorbing material placed in-between. Each wall is of U-shape. Slot perforation is made on the front wall and its perforation coefficient is equal to or exceeds 0.25. The front wall is glazed by sound reflecting translucent panel made as a polygon, for example, a rectangle, formed by U-shape ribs made from vibration damping material. A panel from solid plate out of extruded polycarbonate plastic is used as the sound reflecting translucent element. The frame also consists of a ceiling with luminaries, a back wall placed in the plane parallel to the front wall plane, and four side walls with a door provided in one of them. The area of the back wall is by at least 2 times greater than the area of the front wall, and side walls adjoining the front wall are inclined to it and glazed, and those adjoining the back wall are perpendicular to it. The cabin is leakproof and is equipped by a life support system in the form of an artificially maintained environment system with a control panel, for example, a cartridge conditioner produced by General Climate. Operator's workstation is equipped by a work table and a chair with vibration isolators in the form of elastomer plates attached to the chair legs. "Vibroflex EP/25A" type or "VEP" type vibration damping plates are used as the above elastomer.

EFFECT: invention allows for increased operator's work efficiency due to decreased levels of dust and noise.

9 dwg

FIELD: machine building.

SUBSTANCE: resonant acoustic absorber comprises a rigid frame consisting of an upper active part and a lower reactive part. The reactive part is made as three coaxial and axisymmetrical resonant cylinders with their cavities being fitted by holes of different diameter serving as Helmholtz resonator necks. Supporting disks set at the cylinder ends connect the latter to each other in rigid and leaktight manner forming the reactive part of the rigid frame of the acoustic absorber. The upper active part is made in the form of a rigid perforated cylindrical shell with a perforated cover and a solid base. The cavity of the cylindrical shell is filled with sound absorbing material. At least one spiral acoustic absorbing element in the form of a cylindrical coil spring enclosing the shell is mounted around the perforated cylindrical shell. The upper and lower parts are interconnected by a resilient damping element.

EFFECT: improved efficiency of noise suppression at high frequencies.

2 cl, 1 dwg

FIELD: construction.

SUBSTANCE: invention relates to the industrial acoustics and can be used to reduce the noise of the machine drives, covering of industrial premises. Device comprises the perforated surfaces, between which the sound-absorbing multilayer structure is arranged. Layers of sound-reflecting and sound-absorbing materials of different densities are disposed between the perforated walls. Layers of sound-reflecting material are made of complex profile, consisting of uniformly distributed hollow tetrahedrons, located at the perforated walls. Layers of sound-reflecting material are made of heat-insulating material, capable to support the specified microclimate in the promise. Sound-absorbing element over the entire surface is covered with acoustically transparent material. Porous material or material in the form of the compressed crumbs made of solid vibration-damping materials is used as the sound-absorbing material.

EFFECT: increases efficiency of noise suppression and reliability of the design.

3 cl, 1 dwg, 1 tbl

FIELD: machine building.

SUBSTANCE: in sound-absorbing structure containing solid and perforated surfaces a multi-layer sound-absorbing material is located between the surfaces. The sound-absorbing element is made out of three layers: central layer out of sound reflecting material with complex profile, containing uniformly distributed hollow tetrahedrons, and symmetrically abutting to it sound-absorbing layers out of the materials with different density. As the sound-absorbing material the mats out of mineral wool "Rockwool", or "URSA", or out of basalt wool P-75 are used. The sound-absorbing element is lined with acoustically transparent material.

EFFECT: enhanced efficiency of sound absorption and reliability of the structure.

5 cl, 1 dwg

FIELD: physics, acoustics.

SUBSTANCE: invention relates to means of ensuring safe operation of operators in emergency situations, particularly at high noise levels. A system for acoustic protection of an operator, comprising an operator workstation located between acoustic shields and a suspended ceiling; in the upper area of the building, to reduce sound vibration, the operator workstation is fitted with a floor with an elastic base, wherein the operator is provided with two-stage vibration protection.

EFFECT: high efficiency of soundproofing.

2 tbl, 7 dwg

FIELD: machine building.

SUBSTANCE: sound absorber of combined type contains sound absorbers of active and reactive types located on rigid framework, framework is out of two parts, at that bottom part, i.e. reactive part, is made as rigid hollow cylinder, its bottom is connected with a support disk connecting it with a support disk on which via the resilient dampening element a top part of the framework is installed, it is made as rigid perforated cylindrical shell with perforated cover and solid base connected with the support disk, the cylindrical shell cavity is filled with sound-absorbing material, and the top and the bottom parts are connected by means of the resilient dampening element ensuring dampening of HF oscillations; at that to the perforate cover of the cylindrical shell the element is hingedly connected, using this element the framework is secured to the required object, for example, ceiling of the production room, and around the rigid perforated cylindrical shell at least one helical sound-absorbing element is installed made as cylindrical screw spring enclosing it and resting against the support disk; at that the cylinder cavity of the framework reactive part is tightly covered by the support disk with at least one hole functioning as mouth of Helmholtz resonator, that is crated together with the cylinder cavity, and around the hollow cylinder at least one helical sound-absorbing element is installed, that is made as cylindrical screw spring enclosing the hollow cylinder and resting against the support disks.

EFFECT: improved efficiency of noise suppression at high frequencies.

2 cl, 1 dwg

FIELD: transport.

SUBSTANCE: invention relates to industrial safety. Proposed cabin comprises the bed, carcass, life-supporting hardware, window and door openings and guards composed of acoustic panels. Said bed is installed at, at least, three pneumatic bumpers composed of rubber-cord shell whereto secured is cabin carcass composed by acoustic noise-absorbing panels shaped to parallelepiped composed by front and rear panel walls with noise absorber arranged there between. Every wall features U-like shape. Front wall has perforation. Front wall has glazing composed of noise-reflecting translucent polygonal panel. Said noise-reflecting translucent polygonal panel is composed by solid extruded polycarbonate plastic. Ceiling section is provided with illuminators. rear wall is located in the plane parallel with front wall plane. Side walls abutting on front wall are inclined thereto and glazed while those abutting on rear wall are perpendicular thereto. Sealed cabin is equipped with life supporting system composed by artificial microclimate system with control board. Noise absorber is composed of stiff and perforated walls with sound reflecting plies and sound absorbing materials plies arranged in two plies. Note here that sound-reflecting plies feature complex profile composed of uniformly distributed hollow tetrahedrons to allow reflection of sound waves falling in all directions which are arranged nearby stiff and perforated walls. Said plies are made of heat-insulating material to sustain preset micro climate in a room. Boards of mineral wool or glass wool with glass felt are used as noise absorbing material. Sound-translucent material is sued to line said sound absorbing material over its entire surface.

EFFECT: higher efficiency of operator's work.

8 dwg

FIELD: physics, acoustics.

SUBSTANCE: invention relates to means of protecting industrial areas from negative acoustic-noise action. The resonance noise absorber comprises interconnected panel with working holes in which removable elements are inserted, and a box. The removable elements have holes which act as orifices, the diameter of which, as well as the length of said elements, the distance between the centres of the orifices and between the back inner wall of the box and the end of the removable element are selected to ensure the required range of absorbed frequencies. Stiffening ribs can be used to increase rigidness of the device. The removable elements are installed to ensure tight contact between the elements and the panel.

EFFECT: creating conditions for more effective protection from acoustic-noise contamination of open technospheric areas while reducing the cost of each separate device.

6 cl, 7 dwg

FIELD: physics, acoustics.

SUBSTANCE: invention relates to industrial acoustics. Acoustic structure comprises shop carcass, load-bearing walls with guards composed of the floor and walls lined with sound absorbing structures, window and door frames and single sound dampers. Single sound dampers are composed of noise killers consisting of the case with flap cover and filled with sound absorbing material placed in protective shell. Case walls are composed by sound absorbing structure composed by cylindrical perforated coaxial shells, inner and outer, with sound absorber arranged there between. Sound absorber is composed of at least one shaped porous sheet. Note here that sheet cross-section profile can be triangular, rectangular, trapezoidal, circle arc or sinusoidal.

EFFECT: higher efficiency of noise killing.

7 dwg

Acoustic panel // 2268966

FIELD: industrial acoustic engineering, particularly broadband sound-absorbing means used in all industries to reduce noise generated by processing equipment.

SUBSTANCE: acoustic panel comprises smooth and perforated walls and sound-absorbing material arranged between the walls. Profiled sound-absorbing material surfaces are located between smooth and perforated walls and are inclined one to another at an angle less than 180°. The profiled surfaces are composed of separate members spaced predetermined intervals one from another. The smooth wall has one continuous shaped layer of sound-absorbing material.

EFFECT: increased sound-absorbing efficiency due to increased sound-absorbing surface and reduced labor inputs for panel production and source material consumption.

4 dwg