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EP1659044A2 - Eléments d'isolation acoustique de véhicule ferroviaire, et methodes de fabrication d'éléments d'isolation acoustique - Google Patents

Eléments d'isolation acoustique de véhicule ferroviaire, et methodes de fabrication d'éléments d'isolation acoustique Download PDF

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Publication number
EP1659044A2
EP1659044A2 EP05256530A EP05256530A EP1659044A2 EP 1659044 A2 EP1659044 A2 EP 1659044A2 EP 05256530 A EP05256530 A EP 05256530A EP 05256530 A EP05256530 A EP 05256530A EP 1659044 A2 EP1659044 A2 EP 1659044A2
Authority
EP
European Patent Office
Prior art keywords
sound insulation
sound
insulation member
gas
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05256530A
Other languages
German (de)
English (en)
Other versions
EP1659044A3 (fr
Inventor
Kinya Hitachi Ltd. I.P.G. Aota
Makoto Hitachi Ltd. I.P.G. Watanabe
Katutoshi Hitachi Ltd. I.P.G. Horihata
Daisuke Hitachi Ltd. I.P.G. Mutoh
Shinji Hitachi Ltd. I.P.G. Kinoshita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP1659044A2 publication Critical patent/EP1659044A2/fr
Publication of EP1659044A3 publication Critical patent/EP1659044A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D17/00—Construction details of vehicle bodies
    • B61D17/04—Construction details of vehicle bodies with bodies of metal; with composite, e.g. metal and wood body structures
    • B61D17/18—Internal lining, e.g. insulating
    • B61D17/185—Internal lining, e.g. insulating for sound insulating

Definitions

  • the present invention relates to a railroad vehicle, a sound insulation member used as an interior member of the railroad vehicle, and the method for producing the sound insulation member.
  • the conventional sound insulation members for railroad vehicles utilize fiber materials such as glass wool or foamed materials such as polyurethane.
  • the noise within the vehicle body can be reduced by increasing the thickness of the sound insulation members, but the increase of thickness caused the cabin space of the vehicle body to be narrowed.
  • Patent document 1 discloses a conventional sound insulation member utilizing a foamed material, wherein a polyurethane material is enclosed in a pouched container which is then vacuumed.
  • the prior art sound insulation member disclosed in patent document 1 has its inner space vacuumed, along with which the enclosed polyurethane material is shrunk, resulting in the deterioration of the soundabsorptionabilityof the polyurethane material. Therefore, the prior art sound insulation member did not exert a satisfactory sound insulating performance.
  • the present invention aims at solving the problem by providing a railroad vehicle having an enhanced ride quality without increasing the thickness of the sound insulation member, and a sound insulation member having an enhanced sound insulating performance.
  • a gas having a sound impedance different from that of air is filled in the container.
  • Sound in atmospheric air has a property to be reflected by gas having a sound impedance that differs from air.
  • Sound impedance is calculated by a product of the sound velocity and the density of gas.
  • the gas has a sound impedance that differs greatly from air.
  • gases include helium and carbon dioxide.
  • the purity of the gas should preferablybe high so as to ensure a large difference in impedance, but a purity of approximately 90 % is sufficient for practical use.
  • the present invention enables to provide a railroad vehicle with a superior ride quality and a wide cabin space by utilizing sound insulation members having superior sound insulation properties.
  • the sound insulation member according to the present invention includes gas with a sound impedance different from air filled in a container, wherein the sound insulation properties of the member is enhanced by utilizing both the reflection of sound and the sound absorption effect by the sound absorption material placed therein.
  • Sound absorption materials used in the present invention should preferably be formed of foamed porous materials or fiber materials, which are easy to handle.
  • foamed porous materials or fiber materials include those conventionally used as sound absorption materials, suchaspolyurethane, melamineurethane, polyester, carbon fiber and glass wool.
  • the sound absorption material should preferably have its inner space communicated. Since sound absorption material having its inner space communicated enables gas to be communicated therein, they are preferable for the present invention.
  • the sound absorption materials can be of various shapes, such as flat shape, plate shape, powdery shape, floc shape and multiple rod shape. It is especially preferable to use sound absorption materials that can maintain a given shape in order to facilitate manufacture, handling and installation. Moreover, it is preferable for the sound absorption materials to have sufficient flexibility in order to fit the members to the curved inner sides of the vehicle body.
  • foamed porous sound insulation materials are used, it is effective to form a flat sound absorption material having one smooth surface and an uneven opposite surface.
  • the flat side can be disposed toward the outer side of the vehicle body and the uneven side can be disposed toward the inner side of the vehicle body, so that the flat side exerts the noise reflection effect caused by the difference in sound impedance and the uneven side absorbs the noise from the inner side of the vehicle, further reducing the noise inside the vehicle.
  • the sound insulation members have an uneven surface disposed to face the direction from which noise is generated, the absorption of noise can be enhanced. Therefore, it is possible to form an uneven surface on the sound insulationmembers arranged to face the inner side of the vehicle. At this time, by forming the sound absorption materials to have an uneven surface and an inner pressure equal to or lower than atmospheric pressure, it is possible to have the sealing container adhere to the sound absorption members so that the sound insulation members have an uneven surface.
  • the sealed container used in the present invention should preferably be a pouch.
  • Metal foils are preferably used as the material for forming the pouchbecause of their low specific gravity. Further, since metal foils being thinner than 6 ⁇ m do not have sufficient tolerance to pinholes, they must be thicker than 6 ⁇ m to have the inner gas sealed therein and to exert durability. On the other hand, the weight of the metal foils will increase as the thickness increases, so the metal foils should preferable have a thickness within the range of 6 through 50 ⁇ m.
  • metal laminate films having resin coatings on the metal foils In order to ensure tolerance of the metal foils against bending, it is desirable to use metal laminate films having resin coatings on the metal foils.
  • the sound insulation members should desirably be flat, since the object thereof is to insulate noise.
  • gas containing small gas molecules such as helium must be sealed in the member for a long period of time, since small molecules easily penetrate through resin, it is necessary to metallically cover the portion attached by melting resin via heat seal or the like in order to seal gas.
  • the leak of gas molecules can be prevented by disposing metal backing plates on both sides of the heat seal and welding the backing plates with the heat seal portion of the film.
  • the pressure of the inner gas should be reduced.
  • the shape of the sound absorption materials substantially corresponds to the shape of the sound insulation members, and the size reproducibility of the sound insulation members is thereby improved.
  • the pressure should preferably be lower by at least 1 ⁇ 10 3 Pa than atmospheric pressure which is approximately 1 ⁇ 10 5 Pa.
  • some sound absorption materials may be deformed if the reduced pressure is lower than approximately half the atmospheric pressure or 5 ⁇ 10 4 Pa. Therefore, the internal pressure should be within the range of 5 ⁇ 10 4 Pa through 9.9 ⁇ 10 4 Pa.
  • the sound insulation members formed of foamed porous sound absorption materials to railroad vehicles, since it is difficult to create a large sound insulation member, by forming the ends of flat sound absorption materials to be slanted and overlapping the slanted ends to prevent the formation of gaps between the sound insulation members, the sound insulation members can be applied to railroad vehicles and other large-scale structures.
  • the sound insulation members according to the present invention canbe disposedon the side of the extruded shape members facing the inner side of the vehicle and further having a metal panel disposed on the side of the sound insulation members facing the inner side of the vehicle, the noise inside the vehicle can be further reduced by the double-wall effect realized by the sound insulation members being sandwiched by the hollow extruded shape members and the metal panels.
  • the sound insulation members can reflect the noise from outside the vehicle and absorb the noise from inside the vehicle, by which the noise inside the vehicle can be reduced effectively.
  • FIG. 2 is a perspective view of the sound insulation member according to a first example of the present invention
  • FIG. 1 is a cross-sectional view taken at (I)-(I') of FIG. 2.
  • a sound absorption material 2 and a filler gas 3 are sealed via seal portions 4 formed at both ends of a film 1.
  • the film 1 is an aluminum laminate film in which nylon with a thickness of 20 ⁇ m is coated on an outer side and polyethylene with a thickness of 40 ⁇ m is coated on an inner side of an aluminum foil with a thickness of 6 ⁇ m.
  • the aluminum laminate film is formed by adhering resin films on both sides of an aluminum foil via adhesives.
  • Both sides of the aluminum foil are coated with resin to improve the tolerance of the film against bending so as to facilitate handling, and to enable the film to be heat-sealed.
  • a sealed portion 4 is formed to seal the filler gas inside.
  • Helium is used as the filler gas 3. Since the sound impedance of helium differs greatly from that of air, it enhances the reflection of noise at the surface of the sound insulation member and improves the sound insulation effects.
  • the filler gas 3 should have sound impedance that differs from air, and other gases such as carbon dioxide and argon are also effective. Moreover, the pressure of helium should be slightly reduced than atmospheric pressure.
  • the shape of the sound absorption material is substantially equal to the shape of the sound insulation member, and in this example, the absolute pressure of the gas is set to 9 ⁇ 10 4 Pa.
  • porous foamed urethane is used as the sound absorption material. This is because urethane has sound absorption properties, and the interior thereof is porous thus communicated, enabling the interior thereof to be replaced with helium.
  • FIG. 3 shows a plan view of a film prior to having the sound absorption material inserted thereto.
  • Three edges of the film 1 are sealed by a seal portion 4.
  • the seal portions 4 are curved so that the edges become straight when the sound insulationmember is expanded.
  • FIG. 4 is a front view showing the state in which the sound absorption material 2 is inserted.
  • a pipe 5 is inserted to the film, and a vacuum pump 7 and a helium cylinder 8 are connected thereto via a three-way cock 6.
  • FIG. 5 is a front view showing the sealed state.
  • the film is airtightly sealed by a rubber sealing plate 10 to prevent outer air from entering.
  • a sealing plate is a member composed of rubber, sponge and the like that is designed to prevent gas from leaking when gas is filled via the pipe to the sound insulation member.
  • the interior was vacuumed via the vacuum pump 7 to discharge the gas inside the sound insulation member. Since it is specifically necessary to discharge the air within the porous areas of the sound absorption material, the interior was vacuumed to 5 ⁇ 10 3 Pa. Thereafter, helium was fed from the helium cylinder 8 until the interior reached a pressure of 9 ⁇ 10 4 Pa.
  • FIG. 6 shows the measurement results of the sound insulation properties.
  • the horizontal axis shows the frequency and the vertical axis shows the sound transmission loss. It shows that compared to the prior art sound absorption material 2 used alone, the sound insulation member according to the present invention has superior sound insulation properties.
  • an aluminum foil can be used as the film 1, and the seal portion 4 can be bonded via ultrasonic bonding or friction stir welding. Since these bonding methods realize metal junction, the bonding has enhanced strength compared to heat-sealed resin.
  • FIG. 7 is a perspective view of the sound insulation member according to the second example of the present invention
  • FIG. 8 is a cross-sectional viewtakenat (VIII) - (VIII') of FIG. 7
  • FIG. 9 is a cross-sectional viewtakenat (IX) - (IX') of FIG. 7
  • FIG. 10 is a cross-sectional view showing the state in which the sound insulation members are arranged in parallel.
  • This example differs from the first example in that the seal portion 4 is formed at one side surface of the sound insulation member.
  • the seal portion 4 is arranged at one surface of the flat-shaped sound absorption material 2.
  • FIGS. 11 through 13 illustrate the third example of the present invention.
  • FIG. 11 is a perspective view of the sound insulationmember according to example 3 of the present invention
  • FIG. 12 is a cross-sectional view taken at (XII) - (XII') of FIG. 11
  • FIG. 13 is a cross-sectional view taken at (XIII) - (XIII') of FIG. 11.
  • the present example differs from example 1 in that a longitudinal seal portion 4 is disposed on the flat surface of the sound insulationmember. According to the present example, compared to example 1, since the seal portion 4 is formed to only three edges, the length of the seal portion can be shortened in total, by which the weight of the member can be reduced.
  • FIG. 14 shows a cross-sectional view of the fourth example of the present invention.
  • the present example differs from example 3 in that the shape of the sound absorption materials istrapezoidal. Since the ends of the sound absorptionmaterials 2 are slanted, no gaps are formed between the materials when the ends are overlapped in parallel, and the transmission of sound through the gaps can be suppressed.
  • FIGS. 15 through 17 illustrate a fifth example of the present invention.
  • FIG. 15 is a cross-sectional view of a sound insulation member having triangular grooves 36 formed to one side thereof
  • FIG. 16 is a cross-sectional view of a sound insulation member having arced grooves 36 formed to one side thereof
  • FIG. 17 is a cross-sectional view of a sound insulation member having trapezoidal grooves 36 formed to one side thereof.
  • This example differs from example 3 in that grooves 36 are formed to the surface of one side of the sound insulation members. The flat side with no grooves 36 enhances the reflection of noise, while the uneven side with the grooves enhances the absorption of noise.
  • the uneven surface can be formed by providing projections or grooves to the surface, or by roughening the surface.
  • the surface in which V-shaped grooves are continuously formed along the longitudinal direction is preferable from the viewpoint of improved sound absorption property and the facilitated production of the sound insulation members.
  • angles of the unevenness should be as acute as possible to enhance the sound absorption effects by the multiple reflection of sound in the grooves.
  • the angles are determined based on the material of the inner sound absorption materials, the thickness of the sound insulation members, the inner pressure of the internal gas, and so on.
  • the sound insulation members can be designed in various ways to correspond to the area of the railroad vehicle to which they are to be applied.
  • FIG. 18 is a perspective view of the railroad vehicle body.
  • the railroad vehicle is composed of a roof panel 22, side panels 24, a floor panel 25 and end panels 26.
  • the roof panel 22, the side panels 24 and the floor panel 25 are formedof aluminum alloy hollow extruded shape members 17.
  • FIG. 19 shows a cross-sectional view of the area near the side panel according to example 6.
  • the side panel 17 is a hollow extruded shape member formed by connecting face plates 15 via ribs 16.
  • the present sound insulation members 11 On the surface of the side panel 17 facing the inner side of the vehicle are disposed the present sound insulation members 11.
  • a metal plate 18 is disposed on the side of the sound insulation members 11 facing the inner side of the vehicle.
  • the metal plate should be formed of aluminum since it is lightweight.
  • FIG. 20 shows a seventh example of the present invention.
  • FIG. 20 is a cross-sectional view of the area near the side panel according to the seventh example.
  • This example differs from example 6 in that the surface of the sound insulation members facing the outer side of the vehicle is flat, but the surface facing the inner side of the vehicle is uneven. This structure of the sound insulation member enhances the reflection of noise from outside the vehicle and enhances the absorption of sound from the noise generated inside the vehicle. Thus, the noise level within the vehicle is reduced.
  • FIG. 21 illustrates a railroad vehicle according to the eighth example of the present invention.
  • FIG. 21 shows an example in which the sound insulation members are disposed under the window, on the roof and the floor.
  • the hollow extruded shape members forming the vehicle body has substantially arced edges, so in order to maintain a wide internal space, the sound insulation members must be disposed in an arc to correspond to the curvature of the edges.
  • the sound insulation members are attached to the hollow extruded shape members via adhesives, or by sandwiching between the hollow extruded shape members and metal plates 18.
  • the size of the sound insulationmembers can be, for example, approximately 700 mm in height, 1000 mm in length and 50 mm in thickness on the side walls under the window.
  • the longitudinal direction of the sound insulation members are disposed to correspond to the longitudinal direction of the vehicle.
  • the sound insulation members must be produced to correspond to the shapes of the vehicle body. According to the sound insulation members of the present invention, as shown in FIG. 21, the sound insulation members with various cross-sectional shapes can be produced easily by changing the shapes of the inner structures of the members.
  • the inner structures can be formed of elastic materials so that the sound insulation members have elasticity, which enables the members to be bent in an arc for use.
  • FIG. 22 is a cross-sectional view of the sound insulation member according to example 9
  • FIG. 23 is a cross-sectional view of a seal portion according to example 9.
  • This example differs from example 1 in that backing plates 30 are arranged on both side of the seal portions 4, and the seal portions 4 and backing panels 30 are welded together.
  • the backing plate 30 is an aluminum plate with a thickness of 0.2 mm, and is welded via friction stir welding.
  • the gas to be filled has small molecules such as helium, the molecules easilypass through the polyethylene layer 31 of the seal portions 4, so that during long terms of use, the helium gradually leaks out, deteriorating the properties of the sound insulation members.
  • it is effective to metallically weld the aluminum foils 33 of the films 1 at weld portions 35. Therefore, the welding can be performed also via laser welding or resistance welding, as long as they are metallically welded.
  • the welding should preferably be performed via friction stir welding, laser welding or resistance seam welding.
  • FIG. 24 shows a tenth example of the present invention.
  • FIG. 24 is a cross-sectional view of the seal portion according to the tenth example.
  • Example 10 differs from example 1 in that an insert material 34 is disposed at the outer circumference end of the seal portion 4, and backing plates 30 are disposed on both sides of the insert material, which are subjected to welding by which the seal portion 4 and the backing plates 30 are welded.
  • the insert material 34 and the backing plates 30 are aluminum panels having a thickness of 0.2 mm, and the seal portion 4, the insert material 34 and the backing plates 30 are welded via friction stir welding. As a result, the leaking of helium can be prevented and the performance of the sound insulation member will not deteriorate even after a long period of use.
  • FIG. 25 shows an eleventh example of the present invention.
  • FIG. 25 is a cross-sectional view of the sound insulation member according to the eleventh example of the invention.
  • a sound absorption material 2 Inside the sound insulation member is disposed a sound absorption material 2 having a curved uneven surface 36.
  • the material of the sound absorption material 2 is foamed porous urethane.
  • Helium is sealed in an aluminum laminate film 1 together with the sound absorption material 2.
  • uneven surfaces 36 are formed on both the front and back surfaces of the sound absorption material 2, so that there is only a small contact area between the film 1 and the sound absorption material 2. This arrangement enables to suppress the transmission of soundbeing incident on the film 1 to the sound absorptionmaterial 2 via solid state propagation.
  • the uneven surface 36 contributes to reducing the sound being transmitted through the sound insulation member of the present invention.
  • the shapes of the uneven surface can be triangular, as long as the uneven surface 36 serves to reduce the contact area with the film 1. It is best that the uneven surface 36 contacts the film 1 via point contact, so the shapes of the uneven surface should preferably be a hemisphere or a triangular prism.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
EP05256530A 2004-10-27 2005-10-21 Eléments d'isolation acoustique de véhicule ferroviaire, et methodes de fabrication d'éléments d'isolation acoustique Withdrawn EP1659044A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004311686A JP2006123614A (ja) 2004-10-27 2004-10-27 遮音材を有する鉄道車両，遮音材、および遮音材の製造方法

Publications (2)

Publication Number Publication Date
EP1659044A2 true EP1659044A2 (fr) 2006-05-24
EP1659044A3 EP1659044A3 (fr) 2006-06-07

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EP05256530A Withdrawn EP1659044A3 (fr) 2004-10-27 2005-10-21 Eléments d'isolation acoustique de véhicule ferroviaire, et methodes de fabrication d'éléments d'isolation acoustique

Country Status (4)

Country Link
US (1) US20060101749A1 (fr)
EP (1) EP1659044A3 (fr)
JP (1) JP2006123614A (fr)
TW (1) TW200613179A (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
RU2610842C2 (ru) * 2015-06-29 2017-02-16 Дмитрий Александрович Бузин Способ формирования защитного слоя кузова железнодорожного транспорта

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US20090100781A1 (en) * 2007-10-23 2009-04-23 Mehdi Hatamian Modular building system
EP2446433A4 (fr) * 2009-06-25 2017-08-02 3M Innovative Properties Company Barrière sonore pour gestion de fréquence acoustique audible
US8646239B2 (en) 2010-08-04 2014-02-11 John David Rulon Modular building block building system
JP6132520B2 (ja) * 2012-11-21 2017-05-24 東海旅客鉄道株式会社 吸音パネル
KR101431131B1 (ko) * 2012-11-28 2014-08-18 한국건설기술연구원 도로교통 방음 패널 및 그의 제작 방법
KR101425199B1 (ko) * 2012-11-28 2014-08-01 한국건설기술연구원 도로교통 소음 저감 구조물
DE102013204732A1 (de) * 2013-03-18 2014-09-18 Eberspächer Exhaust Technology GmbH & Co. KG Isolierung
DE102014107290A1 (de) * 2014-05-23 2015-11-26 Ssc Swiss Shielding Corporation Ag Thermisches Isolierelement und Verfahren zur Montage eines thermischen Isolierelements an eine Innenraumoberfläche eines Schienenfahrzeugs
JP6748425B2 (ja) * 2015-12-22 2020-09-02 川崎重工業株式会社 鉄道車両の車体
JP6614584B2 (ja) * 2017-05-31 2019-12-04 本田技研工業株式会社 遮音構造
JP2019182307A (ja) * 2018-04-13 2019-10-24 近畿車輌株式会社 鉄道車両の構体構造および鉄道車両
JP6865442B2 (ja) 2019-03-14 2021-04-28 本田技研工業株式会社 遮音構造
JPWO2021251279A1 (fr) * 2020-06-12 2021-12-16
KR102420868B1 (ko) * 2021-08-26 2022-07-14 실드 주식회사 가요성 흡음벽
CN114013465B (zh) * 2021-11-01 2023-07-21 西安嘉业航空科技有限公司 一种复合板、车体结构及磁悬浮列车
CN115230758A (zh) * 2022-09-21 2022-10-25 之江实验室 一种用于列车车厢减振降噪的可调式声学覆盖层

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Publication number Priority date Publication date Assignee Title
GB987639A (en) * 1962-01-29 1965-03-31 Brush Electrical Eng Means for reducing the noise generated by electrical transformers
DE3531886A1 (de) * 1985-09-06 1987-03-19 Stankiewicz Alois Dr Gmbh Hohlkammern
EP0421887A1 (fr) * 1989-10-06 1991-04-10 Centre National D'etudes Spatiales Ecran d'isolation acoustique pour protéger le compartiment pour charge utile d'un lanceur.
DE4033402A1 (de) * 1990-10-20 1992-04-23 Man Nutzfahrzeuge Ag Vorrichtung zur minderung der abstrahlung von luftschall
DE19526256A1 (de) * 1995-07-19 1997-01-23 Duewag Ag Schall- und wärmedämmender Fußboden für Fahrzeuge, insbesondere Schienenfahrzeuge
WO2001098434A1 (fr) * 2000-06-21 2001-12-27 Compagnie Royale Asturienne Des Mines S.A. Barriere de protection

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2610842C2 (ru) * 2015-06-29 2017-02-16 Дмитрий Александрович Бузин Способ формирования защитного слоя кузова железнодорожного транспорта

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TW200613179A (en) 2006-05-01
EP1659044A3 (fr) 2006-06-07
US20060101749A1 (en) 2006-05-18
JP2006123614A (ja) 2006-05-18

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