• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A sound-absorbing building component for indoor paneling consisting of at least two superimposed sheets, preferably made of a synthetic resin. At least one of the sheets is provided with cup-shaped indentations lying side-by-side in the manner of a grid, the bottom surfaces of these indentations being excitable to lossy vibrations upon the incidence of sound. The upper rims of the cup-shaped indentations are all covered by a further planar sheet which is likewise capable of vibrations. This further sheet seals off the air volumes contained in the individual cup-shaped indentations in an airtight fashion. Small lumpy or irregularly-sized bodies can be provided on the bottom surfaces of the cup-shaped indentations.
    公开号:SU1079183A3
    申请号:SU802931097
    申请日:1980-05-22
    公开日:1984-03-07
    发明作者:Кизеветтер Норберт；Лакатос Берталан
    申请人:Фраунхофер-Гезельшафт Цур Фердерунг Дер Ангевандтен Форшунг Е.В. (Фирма)；
    IPC主号:
    专利说明:

    .il


    The invention relates to building acoustics and relates to a sound-absorbing structural element used as a full or partial covering of enclosed spaces, in particular the interior of the enclosures of machines, apparatuses and appliances, tents, bearing pavilions, as well as industrial, office and residential premises, and This is tuned to the maximum resonance generated in these closed rooms of the noise spectrum, so that the strongest noises are absorbed most intensively.
    When using a sound-absorbing element for cladding and, respectively, covering the tents, especially exhibition, viewing, household and entertainment pavilions, as well as carrying pavilions, its particular advantage is its low weight and the possibility of translucent performance.
    In addition, the proposed sound-absorbing component can be used for full or partial covering of acoustic screens, especially those in open space, for example, non-acoustic acoustic screens on motorways or in shooting galleries.
    A sound-absorbing element is known that includes two plastic films arranged one above the other, one of which is made in the form of a cellular structure with cup-shaped depressions with the bases facing the sound source, and the other covering surface is made flat and hermetically closed over the cavity of the depressions Cl .
    This element has a limited range of sound absorption frequencies, it does not provide the ability to tune to specific sound absorption frequencies.
    The purpose of the invention is to expand the range of sound absorption frequencies.
    This goal is achieved by the fact that in a sound-absorbing element, including two plastic films placed one above the other, one of which is made in the form of a cellular structure with cup-shaped depressions turned bases towards the sound source, and the other surface is made flat and hermetically overlaps the cavities of the recess, the cellular-a structure consists of 3 groups having a different elongated outline of the bases of the cup-shaped elements, while the ratio of length to width is 1.2: 1-2: 1 in one group, 2 in the other, 2: 1-3: 1 and in the third 3.2: 2-5: 1.
    The bases of the recesses are provided with separate metal elements or
    glass surrounded by base film.
    The bases of the recesses are made with evenly or unevenly distributed projections in them. The 5th cover film is profiled and is self-adhesive on the back.
    FIG. 1 shows an element, section j in FIG. 2 - the same in terms of; 0 in FIG. 3 - the same, axonometric} in FIG. 4 — line-up of grooves with equal elongated bases; in fig. 5 - the same, with different base widths; in fig. B is a graph of the change5 of the sound absorption coefficient according to the embodiment of FIG. 4 and 5; in fig. 7 - a cup-shaped groove, the base of which is fitted with separate balls, a slit; in fig. 8 is a graph of the sound absorption coefficient according to the embodiment of FIG. 7, when the bottom of the recesses is smooth, with glass balls and lead balls; in fig. 9 - cup-shaped groove with an equal coating film, incision; in fig. 10 - the same, with notches in the base of the recesses; in fig. 11 is a graph of sound absorption coefficient in accordance with the embodiment of FIG. 9 and 10.
    The sound-absorbing element includes two plastic films one above the other, one of which 1 is made in the form of a cellular
    5, the structures with cup-shaped depressions 2, with their bases turned towards the source 3 of sound, and the other cover 4 are made flat and hermetically overlapping the cavity
    0 recesses. The outline of the bases of the 5 grooves may be different.
    The number of natural frequencies of the square base plate is relatively limited. These intrinsic variations5 can be represented by
    II
    ; /
    m.ni

    n-x sin
    m-y.
    but
    (one
    - plate deflection;
    - amplitude at own
    oscillation; - side length is square
    plates;
    - coordinates of the plate, with one angle of the plate located at the zero point of the coordinate system, while the adjacent sides extend along the x and y axes, respectively; - integers that are larger
    or equal to 1.
    For symmetries in squares, the natural oscillations of (m, n) and (n, m) at the same frequency are smooth. Conversely, the proper vibrations of rectangular plates can be represented by the equation .n J J ™ 2) where a denotes the length and b is the width of the rectangular plate, while other formula signs have the same meaning as in equation (1). In rectangular plates, in contrast to the square position, the eigen oscillations (m, n) and (n, ha) lie at different frequencies, so that in general, much more natural oscillations of rectangular plates are created, which improves sound absorption, as sound absorption at resonant frequencies has a maximum. This is advantageous when the bases of the cup-shaped grooves of the sound-absorbing elements are rectangular, if two or more groups of different sized rectangular bases of the cup-shaped grooves are provided, especially with different ratios of length a to width b. In order to provide a clear view of the actions that arise when using differently sized square nicknames as bases for cup-shaped grooves, fig. Figure 5 shows two sound absorption curves I and II, of which curve I refers to the sound absorption of the assembly in FIG. 4, and curve II to the sound absorption of the line-up of FIG. 5. As shown in FIG. 6, with the arrangement according to FIG. 5, the sound absorption coefficient of which in terms of frequency is represented by curve II, a wider absorption curve is obtained as compared with the arrangement according to FIG. 4, the sound curve of which I have only one maximum. The foregoing is also valid in principle for other forms of surfaces, so that in general it can be said that preference should be given to drawn bases, for example, in the form of an ellipse compared to surfaces in the form of a circle, since the former have a greater number of natural oscillations than the last. The mismatch, i.e. a change in the natural frequencies of individual bases may also occur as a result of what is possible, as shown in FIG. 7, place the separate bodies 6, preferably the balls, on the film-shaped bases of the 5 cup-shaped recesses 2. FIG. 7 shows a partial section through a deep-drawn mold 7, in which cup-shaped cavities located next to each other are made of plastic film 8. One of the many vacuum channels entering the region of the deep-drawing form on which the bases 5 are formed during deep-drawing, indicated by 9. A particularly preferred method for fixing individual bodies 6j, for example glass or lead balls, on the basis of a 5 cup-shaped recess 2 is that the individual bodies 6 before placing the deep draw TV areas of the form of deep drawing 7, in which the bases of 5 cup-shaped cavities 2 arise during the process of deep drawing; When during the process of deep drawing, cup-shaped cavities 2 are formed, and separate bodies B are placed in these areas, plastic film 8 is caused by formed by vacuum channels 9, the vacuum is placed around the individual bodies b with a positive locking, so that these individual bodies are more than half covered by a plastic film 8. In FIG. 8 shows the sound absorption coefficient of various sound absorbing elements. The curve curve III shows the nature of the sound absorption coefficient of the element, in which the bases of the cup-shaped grooves are smooth and not thinned by separate bodies. The bases in this case are arbitrary. Presented by the solid lines of curve IV and the lines and the lines of curve V, respectively, show the effect of the relaxation of the bottom surfaces of individual bodies. Curve iV shows the sound absorption coefficient at the bottom of the desired surface of glass beads, and curve V shows the sound absorption coefficient of the free surface of the bottom surface of the lead balls. As a result, in general, an increase in sound absorption coefficient and an increase in the useful frequency range towards lower frequencies are obtained. With lead balls, as curve V clearly shows, sound absorption in the frequency range of 400-1200 Hz, i.e. the sound absorption coefficient is greatly increased; in addition, the sound absorption coefficient at higher frequencies of 1200-3500 Hz prevails over the sound-absorption coefficient, which has the base element
    cup-shaped grooves are not fitted. Only above 3500 Hz, the absorption coefficient falls according to the V curve below the sound absorption coefficient of the -III curve,
    As can be seen from curve IV, although it is desired by glass beads, it does not, in the described example, perform such a strong increase in sound absorption coefficient in the lower frequency range as is the case when the bases are softened with lead balls, which is understandable due to the lower glass weight of these balls, eato in general, practically creates an increase in the sound absorption coefficient as a result of the flattening of glass balls in the frequency range from 400 to almost 5000 Hz and simplifying the shape of the coefficient of sound absorption absorption, those. the difference between the maximum and minimum of the IV curve is less than
    : between the maximum and minimum of curve III, cht-o means less dependence of the sound chord coefficient, nor on the corresponding sound frequency.
    In addition, there is a further possibility of increasing the number of resonant frequencies and thereby achieving broadband absorption due to the fact that the individual bases of the cup-shaped grooves are mismatched with each other by the extruded protrusions, so that there are therefore two or more groups of cup-shaped grooves 2, which differ in that that their bases 5 are made with differently arranged
    protrusions 10. For comparison, a cup-shaped depression 2 with a smooth base 5 of the same
    size. Both cup-shaped depressions are covered with a cover film 4 (Fig. 9 and 10).
    FIG. 11, the sound absorption coefficient of a structural element with cup-shaped depressions 2, bases 5 which are smooth, is represented by the solid lines of the IV curve, while the sound absorption coefficient of the element, whose base 5 of the cup-shaped depressions 2 is made with extruded projections 10, shows the curve VII . Separately, the basis of curves VI and VII are the following approximate forms of cup-shaped grooves.
    In both cases, the bottoms of the 5 knots; the depressions 2 are square. In the bases 5 of the mold according to FIG. 10, the protrusions are unevenly distributed. The bases of 5 different cup-shaped depressions 2 of the same element are characterized in that the placement of the extruded protrusions 10 is different from one base to another.
    As can be seen from FIG. 11, as a result of this design and the placement of the extruded protrusions 10 in the bases 5, a much more uniform passage of the sound absorption coefficient curve in the frequency range of 5005000 Hz is obtained as compared to smooth bottom surfaces.
    The cover film, 4, as shown in FIG. 10, for stiffening, may be profiled, such as corrugations 11. In addition, the reverse side of the cover film 4 may be self-adhesive for mounting reasons.
    Films 1 and 4 can be transparent or colored.
    The use of the proposed sound-absorbing element will allow to expand the range of sound absorption frequencies and to increase the sound absorption coefficient.
    5 5
    one/
    WO 200
    FIG.
    JOO 400 500 600 (puz.SVacmo ff.rif
    eight
    权利要求:
    Claims (4)
    [1]
    1. SOUND-ABSORPING ELEMENT, including two plastic films located one above the other, one of which is made in the form of a cellular structure with cup-shaped indentations facing the sound source and the other is integumentary - made flat and hermetically overlays the cavity of the indentations, characterized in that that, in order to expand the frequency range of sound absorption, the cellular structure consists of 3 groups having different elongated outlines of the bases of the cup-shaped elements, while the ratio of length to width is It is 1.2: 1-2: 1 in one group, 2.2: 1-3: 1 in the other, and 3.2: 25: 1 in the third.
    [2]
    2. The element according to claim 1, characterized in that the bases of the recesses are provided with separate elements of metal or glass, surrounded by a base film.
    [3]
    3. The element according to claim 2, characterized in that the base of the recesses are made with protrusions evenly or unevenly distributed in them.
    [4]
    4. The element pop.Z, characterized in that the coating film is made of profiled, and the back side is self-adhesive.
    s g 1
    // /// R ^ ι 11 ...., - 1 /..- 1FIG. 1
    THX
    July
    Oh mm
    □ About
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    同族专利:
    公开号 | 公开日
    ES8101173A1|1980-12-16|
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    FR2457350A1|1980-12-19|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19792921050|DE2921050C2|1979-05-23|1979-05-23|
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