JP2018008571A - Floor structure of railway vehicle - Google Patents

Floor structure of railway vehicle Download PDF

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JP2018008571A
JP2018008571A JP2016137582A JP2016137582A JP2018008571A JP 2018008571 A JP2018008571 A JP 2018008571A JP 2016137582 A JP2016137582 A JP 2016137582A JP 2016137582 A JP2016137582 A JP 2016137582A JP 2018008571 A JP2018008571 A JP 2018008571A
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floor
railway vehicle
floor structure
sound
honeycomb material
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JP6749802B2 (en
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美智夫 瀬畑
Michio Sehata
美智夫 瀬畑
中村　英之
Hideyuki Nakamura
英之 中村
尚史 古川
Hisafumi Furukawa
尚史 古川
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Hitachi Ltd
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Hitachi Ltd
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Abstract

PROBLEM TO BE SOLVED: To solve a problem in which vibration and a sound generated from an under-floor bogie drive unit device propagate to a floor receiver from a bogie frame, also solidly propagate to an upper floor, and are transmitted to the upper floor as a transmission sound via an air layer, and then, it is necessary to reduce noise in a passenger cabin by reducing the solid propagation sound and the transmission sound which are transmitted to the upper floor from the underfloor.SOLUTION: In a floor structure of a railway vehicle for supporting an upper floor via a floor receiver arranged on a bogie, the upper floor is constituted of a honeycomb material, a vibration damping material is arranged on a surface of at least one face plate of the honeycomb material, and a plurality of holes penetrating the face plate and the vibration damping material are formed. Also in the floor structure of the railway vehicle for supporting the upper floor via the floor receiver arranged on the bogie, the upper floor is constituted of the honeycomb material, a flat plate is arranged on the surface of at least one face plate of the honeycomb material via a liner, and a plurality of holes are formed at the flat plate.SELECTED DRAWING: Figure 2

Description

本発明は、鉄道車両の床構造に係り、特に床下から伝わる固体伝播音及び透過音を低減することによって、客室内の騒音を低減する方法に関する。   The present invention relates to a floor structure of a railway vehicle, and more particularly to a method for reducing noise in a passenger cabin by reducing solid propagation sound and transmitted sound transmitted from under the floor.

近年、新幹線車両などの鉄道車両の高速化が進んでおり、速度の向上に伴って増加する車内騒音の低減が強く求められている。特に、台車上の客室においては、床下の台車駆動系装置からの固体伝播音や透過音が増加し、客室内の快適性が著しく損なわれるなどの問題が発生している。   In recent years, the speed of railway vehicles such as Shinkansen vehicles has been increased, and there is a strong demand for reduction of in-vehicle noise that increases as the speed increases. In particular, in passenger cabins on trolleys, there are problems such as increased solid propagation sound and transmitted sound from the trolley drive system device under the floor, and the comfort in the passenger cabin is significantly impaired.

このような問題に関して、特許文献１には、コルクの板材に木質の板材を重ねて補強した上床を適用し、床下から伝わる固体伝播音を低減することが示されている。また、特許文献２あるいは特許文献３には、ハニカム材の面板に多孔を設けた上床を適用し、ヘルムホルツ共鳴の原理を利用して、床下から伝わる透過音を低減することが示されている。このヘルムホルツ共鳴における吸音周波数ｆ０は、次式（１）により求められる。
（１）式において、Ｃは音速、Ｓは孔の断面積、Ｖは空間の容積、Lは孔の長さ、δは管端部補正である。 With respect to such a problem, Patent Document 1 discloses that an upper floor in which a wooden board is overlapped with a cork board and reinforced is applied to reduce solid sound transmitted from under the floor. Patent Document 2 or Patent Document 3 discloses that an upper floor provided with a porous surface plate of a honeycomb material is applied and the transmitted sound transmitted from under the floor is reduced using the principle of Helmholtz resonance. The sound absorption frequency f 0 in this Helmholtz resonance is obtained by the following equation (1).
In the equation (1), C is the speed of sound, S is the sectional area of the hole, V is the volume of the space, L is the length of the hole, and δ is the tube end correction.

特開２００３−１８２５７２号公報JP 2003-182572 A 特開平７−１８６９４２号公報JP-A-7-186842 特開２０１３−８０１２号公報JP2013-8012A

床下の台車駆動系装置から発生する振動と音は、台枠から床受けなどを伝わり上床へ固体伝播するとともに、空気層を経由して上床に透過音として伝わる。この床下から上床へ伝わる固体伝播音及び透過音を低減させて、客室内の騒音を低減する必要がある。   The vibration and sound generated from the bogie drive system device under the floor are transmitted as solid sound through the airframe to the upper floor as well as to the upper floor through the floor support and the like. It is necessary to reduce the noise in the passenger cabin by reducing the solid propagation sound and transmitted sound transmitted from below the floor to the upper floor.

このため、特許文献１〜３に示した上床が考案されているが、特許文献１に示した構造は固体伝播音の低減に着目した構造、特許文献２あるいは特許文献３に示された構造は透過音の低減に着目した構造であり、固体伝播音及び透過音の両方を低減する構造になっていない。また、特許文献２あるいは特許文献３に示された構造は、床下の低周波音低減を目的として孔の長さを確保するための多数の部品から構成されており、製作に手間を要するといった問題もある。   For this reason, although the upper floor shown in patent documents 1-3 is devised, the structure shown in patent documents 1 is the structure which paid its attention to reduction of a solid propagation sound, the structure shown in patent documents 2 or patent documents 3 This structure focuses on the reduction of transmitted sound, and does not have a structure that reduces both solid propagation sound and transmitted sound. Further, the structure shown in Patent Document 2 or Patent Document 3 is composed of a large number of parts for securing the length of the hole for the purpose of reducing low-frequency sound under the floor, and it takes time and effort to manufacture. There is also.

本発明は、これらの問題点に鑑みてなされたもので、固体伝播音及び透過音を同時に抑制でき、かつ製作が容易な鉄道車両の床構造を提供することを目的としている。   The present invention has been made in view of these problems, and an object of the present invention is to provide a railcar floor structure that can simultaneously suppress solid-borne sound and transmitted sound and is easy to manufacture.

かかる課題を解決するため本発明においては、台枠上に配置した床受けを介して上床を支持した鉄道車両の床構造において、上床をハニカム材で構成し、ハニカム材の少なくとも一方の面板の表面に制振材を配置し、面板と制振材を貫通する複数の孔を設けるようにした。   In order to solve such a problem, in the present invention, in a floor structure of a railway vehicle that supports an upper floor via a floor receiver arranged on a frame, the upper floor is made of a honeycomb material, and the surface of at least one face plate of the honeycomb material The vibration damping material is disposed in the base plate, and a plurality of holes are provided through the face plate and the vibration damping material.

また本発明においては、台枠上に配置した床受けを介して上床を支持した鉄道車両の床構造において、上床をハニカム材で構成し、ハニカム材の少なくとも一方の面板の表面にライナを介して平板を配置し、平板に複数の孔を設けるようにした。   In the present invention, in the floor structure of a railway vehicle that supports the upper floor via a floor receiver arranged on the underframe, the upper floor is made of a honeycomb material, and the surface of at least one face plate of the honeycomb material is interposed via a liner. A flat plate was arranged, and a plurality of holes were provided in the flat plate.

本発明は、以上の構成を備えるため、床下から上床へ伝わる固体伝播振動をハニカム材に貼付した制振材により低減でき、透過音をハニカム材と制振材を貫通する複数の孔で低減できる。   Since the present invention has the above-described configuration, it is possible to reduce the solid propagation vibration transmitted from the under floor to the upper floor by the damping material attached to the honeycomb material, and it is possible to reduce the transmitted sound by a plurality of holes penetrating the honeycomb material and the damping material. .

また、床下から上床へ伝わる固体伝播音をハニカム材と平板の間の空気層により絶縁でき、透過音を平板に設けた複数の孔で低減できる。すなわち、多数の部品を用いる必要がないため製作が容易であり、固体伝播音と透過音を同時に抑制できるため、客室内の騒音を低減できる。   Moreover, the solid propagation sound transmitted from the under floor to the upper floor can be insulated by the air layer between the honeycomb material and the flat plate, and the transmitted sound can be reduced by a plurality of holes provided in the flat plate. That is, since it is not necessary to use a large number of parts, the manufacture is easy, and the solid propagation sound and transmitted sound can be suppressed at the same time, so that the noise in the cabin can be reduced.

本発明の実施の形態による鉄道車両の台車上近傍の車体構造を説明する図である。It is a figure explaining the vehicle body structure of the rail vehicle top vicinity by embodiment of this invention. 本発明の実施の形態による床構造を説明する図である。It is a figure explaining the floor structure by embodiment of this invention. 本発明の実施の形態による床構造を説明する図である。It is a figure explaining the floor structure by embodiment of this invention. 変形例１の床構造を説明する図である。It is a figure explaining the floor structure of the modification 1. FIG. 変形例２の床構造を説明する図である。It is a figure explaining the floor structure of the modification 2. 変形例３の床構造を説明する図である。It is a figure explaining the floor structure of the modification 3. FIG. 変形例４の床構造を説明する図である。It is a figure explaining the floor structure of the modification 4. 変形例５の床構造を説明する図である。It is a figure explaining the floor structure of the modification 5. FIG.

以下図面について、本発明の一実施の形態を詳述する。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

（１）本実施の形態
図１は、本実施の形態による鉄道車両の台車上近傍の車体構造を説明する図である。図１において、車体１には、屋根構体２、側構体３、台枠４、中梁５が配置され、台枠４上に床受け６、その上に防振ゴム７が配置され、上床８を支持している。台枠４と上床８との間には、空調ダクト９が設けられている。 (1) This Embodiment FIG. 1 is a diagram for explaining a vehicle body structure in the vicinity of a railway vehicle on a carriage according to this embodiment. In FIG. 1, a vehicle body 1 includes a roof structure 2, a side structure 3, a base frame 4, and a middle beam 5. Support. An air conditioning duct 9 is provided between the underframe 4 and the upper floor 8.

図２及び図３において、上床８はハニカム材からなる床材である。上床８においては、上板１１ａと下板１１ｂの間にハニカムコア１２が内挿され、上板１１ａ、ハニカムコア１２及び下板１１ｂが接着結合されている。ハニカムコア１２の内部には、コア空間１３が存在する。さらに、下板１１ｂの表面には制振材１０が接着剤により貼付されている。この下板１１ｂと制振材１０には、貫通された孔１４が設けられている。図３に示すように、多孔となる孔１４は、ハニカムコア１２に対応して開けられた孔であり、千鳥状である。なお、孔１４は、ハニカムコア１２のほぼ中心に開いているのが理想であるが、１つのコアに孔が２個入るなどの箇所が発生しても良い。   2 and 3, the upper floor 8 is a floor material made of a honeycomb material. In the upper floor 8, the honeycomb core 12 is inserted between the upper plate 11a and the lower plate 11b, and the upper plate 11a, the honeycomb core 12 and the lower plate 11b are adhesively bonded. A core space 13 exists inside the honeycomb core 12. Furthermore, the damping material 10 is stuck on the surface of the lower plate 11b with an adhesive. The lower plate 11b and the damping material 10 are provided with a through hole 14. As shown in FIG. 3, the porous holes 14 are holes corresponding to the honeycomb core 12 and have a zigzag shape. It is ideal that the hole 14 is opened substantially at the center of the honeycomb core 12, but a location such as two holes entering one core may occur.

このような構成において、床下から台枠４を介して床受け６、防振ゴム７を伝わり上床８へ伝わる固体伝播振動はハニカム材に貼付された制振材１０により低減でき、台枠４から透過してくる透過音は制振材１０と下板１１ｂに設けられた孔１４とコア空間１３の寸法などにより吸音周波数が決まるヘルムホルツ共鳴の原理により低減できる。   In such a configuration, the solid propagation vibration transmitted from below the floor via the underframe 4 through the floor support 6 and the vibration isolating rubber 7 to the upper floor 8 can be reduced by the damping material 10 attached to the honeycomb material. The transmitted sound that is transmitted can be reduced by the Helmholtz resonance principle in which the sound absorption frequency is determined by the dimensions of the hole 14 and the core space 13 provided in the damping material 10 and the lower plate 11b.

これは、ハニカム材とその表面に貼付した制振材１０を同時に貫通する孔１４を設けたことにより、孔１４の長さＬをＬ＝Ｌ１＋Ｌ２と長くし、前述の（１）式により求まる吸音周波数ｆ０を床下の低周波音領域まで低下させることで可能となる。 This is because the hole L that simultaneously penetrates the honeycomb material and the vibration damping material 10 attached to the surface of the honeycomb material is made long as L = L1 + L2, and the sound absorption obtained by the above-described equation (1). It made possible by lowering the frequency f 0 to a low frequency sound regions of the underfloor.

（２）変形例
（２−１）変形例１
図４は、変形例１の床構造を説明する図である。図４において、本実施の形態のハニカムコア１２の内部のコア空間１３において、下板１１ｂ側に距離Ｌ３だけ吸音材１５を設置したものである。これにより、孔１４の長さを延長できるので、より低い周波数の騒音を低減できる。また、吸音材１５の吸音効果により、さらなる車内騒音の低減が期待できる。 (2) Modification (2-1) Modification 1
FIG. 4 is a diagram illustrating the floor structure of the first modification. In FIG. 4, in the core space 13 inside the honeycomb core 12 of the present embodiment, a sound absorbing material 15 is installed on the lower plate 11b side by a distance L3. Thereby, since the length of the hole 14 can be extended, the noise of a lower frequency can be reduced. Further, the noise absorption effect of the sound absorbing material 15 can be expected to further reduce vehicle interior noise.

（２−２）変形例２
図５は、変形例２の床構造を説明する図である。図５において、本実施の形態の孔１４の表面にポリエチレンあるいは塩化ビニール樹脂系などのラップ材１６を設けたものである。これにより、ハニカム材の内部への水分あるいは湿度の侵入を防止でき、ハニカムコア１２と上板１１ａと下板１１ｂとの接着の剥がれを抑制できる。なお、透過音はラップ材１６を通るので、共鳴効果は得られることになる。なお、ラップ材１６の代わりに、撥水性のものを孔表面に塗膜として散布しても良い。 (2-2) Modification 2
FIG. 5 is a diagram illustrating the floor structure of the second modification. In FIG. 5, a wrap material 16 such as polyethylene or vinyl chloride resin is provided on the surface of the hole 14 of the present embodiment. Thereby, it is possible to prevent moisture or humidity from entering the inside of the honeycomb material, and it is possible to suppress the peeling of the adhesion between the honeycomb core 12, the upper plate 11a, and the lower plate 11b. Since the transmitted sound passes through the wrapping material 16, a resonance effect is obtained. Instead of the wrapping material 16, a water-repellent material may be sprayed on the hole surface as a coating film.

（２−３）変形例３
図６は、変形例３の床構造を説明する図である。図６において、本実施の形態のハニカムコア１２に制振塗料１７を塗布したものである。これにより、制振効果を高めることで固体伝播音を抑制でき、さらなる車内騒音の低減が期待できる。 (2-3) Modification 3
FIG. 6 is a diagram illustrating the floor structure of the third modification. In FIG. 6, the vibration-damping paint 17 is applied to the honeycomb core 12 of the present embodiment. Thereby, the solid propagation sound can be suppressed by enhancing the vibration damping effect, and further reduction of vehicle interior noise can be expected.

（２−４）変形例４
図７は、変形例４の床構造を説明する図である。図７において、上床８には、上板１１ａと下板１１ｂの間にハニカムコア１２が内挿され、上板１１ａ、ハニカムコア１２及び下板１１ｂが接着結合されている。ハニカムコア１２の内部には、コア空間１３が存在する。さらに、下板１１ｂの下方には、ライナ１９で空間を有した平板２０がライナ１９に接着剤により貼付されている。ライナ１９は下板１１ｂに接着剤により貼付されている。この平板２０には、孔１８が設けられている。孔１８は、下板１１ｂ、ライナ１９及び平板２０で形成された空間に対応して開けられた孔であり、前述の（１）式により求まる吸音周波数ｆ０が床下の低周波音領域に一致するよう設計されるものである。 (2-4) Modification 4
FIG. 7 is a diagram illustrating the floor structure of the fourth modification. In FIG. 7, on the upper floor 8, a honeycomb core 12 is inserted between an upper plate 11a and a lower plate 11b, and the upper plate 11a, the honeycomb core 12 and the lower plate 11b are adhesively bonded. A core space 13 exists inside the honeycomb core 12. Further, a flat plate 20 having a space in the liner 19 is attached to the liner 19 with an adhesive below the lower plate 11b. The liner 19 is attached to the lower plate 11b with an adhesive. The flat plate 20 is provided with holes 18. Hole 18, the lower plate 11b, a hole drilled in correspondence with the space formed by the liner 19 and the flat plate 20, matching sound-absorption frequency f 0 which is obtained by the above-described (1) to the low-frequency sound regions of the underfloor It is designed to do.

このような構成において、床下から台枠４を介して床受け６、防振ゴム７を伝わり上床８へ伝わる固体伝播振動は下板１１ｂと平板２０との間の空間で絶縁され、台枠４から透過してくる透過音は平板２０に設けられた孔１８の寸法や平板２０の間の空間の寸法などにより吸音周波数が決まるヘルムホルツ共鳴の原理により低減できる。   In such a configuration, the solid propagation vibration transmitted from the bottom to the upper floor 8 through the floor receiver 6 and the anti-vibration rubber 7 via the underframe 4 is insulated in the space between the lower plate 11b and the flat plate 20, and the underframe 4 The transmitted sound transmitted through the plate 20 can be reduced by the Helmholtz resonance principle in which the sound absorption frequency is determined by the size of the holes 18 provided in the flat plate 20 and the size of the space between the flat plates 20.

これは、ハニカム材とその下方に配置した平板２０の間に仕切りのない空間を設けたことにより、孔１４の間隔を広くし、前述の（１）式により求まる吸音周波数ｆ０を床下の低周波音領域まで低下させることで可能となる。なお、さらなる透過音の低減のために、下板１１ｂと平板２０の間の空間に吸音材を配置しても良い。 This is because the space between the holes 14 is widened by providing a space without a partition between the honeycomb material and the flat plate 20 disposed below the honeycomb material, and the sound absorption frequency f 0 obtained by the above-described equation (1) is reduced to a low level under the floor. This can be achieved by reducing the frequency sound region. Note that a sound absorbing material may be disposed in the space between the lower plate 11b and the flat plate 20 in order to further reduce the transmitted sound.

（２−５）変形例５
図８は、変形例５の床構造を説明する図である。図８において、変形例４の下板１１ｂに孔１４を設けたものである。これにより、さらなる透過音の低減を図ることができる。
(2-5) Modification 5
FIG. 8 is a diagram for explaining the floor structure of the fifth modification. In FIG. 8, a hole 14 is provided in the lower plate 11b of the fourth modification. Thereby, the further reduction of transmitted sound can be aimed at.

なお、平板２０に設けられた複数の孔１８をなくすことで、水分の侵入を防ぐことが可能となる。複数の孔１８を設けなくともハニカム空間での共鳴と平板２０の距離Ｌ３による空間の共鳴が得られる効果が期待できる。   It is possible to prevent moisture from entering by eliminating the plurality of holes 18 provided in the flat plate 20. Even if the plurality of holes 18 are not provided, it is possible to expect an effect that resonance in the honeycomb space and resonance in the space due to the distance L3 of the flat plate 20 can be obtained.

本発明の技術的範囲は、特許請求の範囲の各請求項の記載あるいは課題を解決するための手段の項の記載に基づいて定められるが、当業者がそれから容易に置き換えられる範囲にも及ぶものである。   The technical scope of the present invention is determined on the basis of the description of each claim of the claims or the description of the means for solving the problems, but also extends to a range easily replaceable by those skilled in the art. It is.

１……車体、２……屋根構体、３……側構体、４……台枠、５……中梁、６……床受け、７……防振ゴム、８……上床、９……空調ダクト、１０……制振材、１１ａ……上板、１１ｂ……下板、１２……ハニカムコア、１３……コア空間、１４……孔、１５……吸音材、１６……ラップ材、１７……制振塗料、１８……孔、１９……ライナ、２０……平板。   1 ... body, 2 ... roof structure, 3 ... side structure, 4 ... frame, 5 ... center beam, 6 ... floor support, 7 ... vibration-proof rubber, 8 ... upper floor, 9 ... Air conditioning duct, 10 ... Damping material, 11a ... Upper plate, 11b ... Lower plate, 12 ... Honeycomb core, 13 ... Core space, 14 ... Hole, 15 ... Sound absorbing material, 16 ... Wrap material 17 ... Damping paint, 18 ... Hole, 19 ... Liner, 20 ... Flat plate.

Claims (11)

台枠上に配置した床受けを介して上床を支持した鉄道車両の床構造において、
前記上床をハニカム材で構成し、前記ハニカム材の少なくとも一方の面板の表面に制振材を配置し、前記面板と前記制振材を貫通する複数の孔を設けた
ことを特徴とする鉄道車両の床構造。 In the floor structure of a railway vehicle that supports the upper floor via a floor receiver placed on the underframe,
A railway vehicle comprising the upper floor made of a honeycomb material, a damping material disposed on a surface of at least one face plate of the honeycomb material, and a plurality of holes penetrating the face plate and the damping material. Floor structure. 請求項１に記載の鉄道車両の床構造において、
前記複数の孔を千鳥状に設けた
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 1,
The floor structure of a railway vehicle, wherein the plurality of holes are provided in a staggered pattern. 請求項１に記載の鉄道車両の床構造において、
前記制振材は前記ハニカム材の面板に接着剤で貼付されている
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 1,
The floor structure of a railway vehicle, wherein the damping material is attached to the face plate of the honeycomb material with an adhesive. 請求項１に記載の鉄道車両の床構造において、
前記ハニカム材の内部に吸音材を配置した
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 1,
A floor structure for a railway vehicle, wherein a sound absorbing material is disposed inside the honeycomb material. 請求項１に記載の鉄道車両の床構造において、
前記複数の孔の表面に、ポリエチレンあるいは塩化ビニール樹脂系などのラップ材を設けた
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 1,
A floor structure of a railway vehicle, wherein a wrap material such as polyethylene or vinyl chloride resin is provided on the surface of the plurality of holes. 請求項１に記載の鉄道車両の床構造において、
前記ハニカム材の内部のコアに制振塗料を塗布した
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 1,
A floor structure for a railway vehicle, wherein a damping paint is applied to an inner core of the honeycomb material. 請求項１に記載の鉄道車両の床構造を台車上に設けた
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 1, wherein the floor structure of the railway vehicle is provided on a carriage. 台枠上に配置した床受けを介して上床を支持した鉄道車両の床構造において、
前記上床をハニカム材で構成し、前記ハニカム材の少なくとも一方の面板の表面にライナを介して平板を配置し、前記平板に複数の孔を設けた
ことを特徴とする鉄道車両の床構造。 In the floor structure of a railway vehicle that supports the upper floor via a floor receiver placed on the underframe,
A floor structure for a railway vehicle, wherein the upper floor is made of a honeycomb material, a flat plate is disposed on a surface of at least one face plate of the honeycomb material via a liner, and a plurality of holes are provided in the flat plate. 請求項８に記載の鉄道車両の床構造において、
前記ライナを前記ハニカム材の面板に接着剤で貼付し、前記平板を前記ライナに接着剤で貼付した
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 8,
The floor structure of a railway vehicle, wherein the liner is affixed to the face plate of the honeycomb material with an adhesive, and the flat plate is affixed to the liner with an adhesive. 請求項８に記載の鉄道車両の床構造において、
前記ハニカム材の少なくとも一方の面板に複数の孔を設けた
ことを特徴とする鉄道車両の床構造。 The floor structure of a railway vehicle according to claim 8,
A floor structure for a railway vehicle, wherein a plurality of holes are provided in at least one face plate of the honeycomb material. 請求項８に記載の鉄道車両の床構造を台車上に設けた
ことを特徴とする鉄道車両の床構造。 A railcar floor structure according to claim 8, wherein the railcar floor structure according to claim 8 is provided on a carriage.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0326532U (en) * 1989-07-25 1991-03-18
JPH04118356A (en) * 1990-09-07 1992-04-20 Hitachi Ltd Noiseless vehicle
JP2003200825A (en) * 2001-12-28 2003-07-15 Central Japan Railway Co Floor structure for rolling stock
JP2006248249A (en) * 2005-03-08 2006-09-21 Kawaju Gifu Engineering Kk Noise absorbing panel for high-speed railway vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0326532U (en) * 1989-07-25 1991-03-18
JPH04118356A (en) * 1990-09-07 1992-04-20 Hitachi Ltd Noiseless vehicle
JP2003200825A (en) * 2001-12-28 2003-07-15 Central Japan Railway Co Floor structure for rolling stock
JP2006248249A (en) * 2005-03-08 2006-09-21 Kawaju Gifu Engineering Kk Noise absorbing panel for high-speed railway vehicle

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