JP3503395B2 - Vehicle soundproofing - Google Patents
Vehicle soundproofingInfo
- Publication number
- JP3503395B2 JP3503395B2 JP05011097A JP5011097A JP3503395B2 JP 3503395 B2 JP3503395 B2 JP 3503395B2 JP 05011097 A JP05011097 A JP 05011097A JP 5011097 A JP5011097 A JP 5011097A JP 3503395 B2 JP3503395 B2 JP 3503395B2
- Authority
- JP
- Japan
- Prior art keywords
- sound
- surface opening
- opening
- hole
- sound source
- 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.)
- Expired - Fee Related
Links
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は車両の音源近辺に配
設する防音装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof device arranged near a sound source of a vehicle.
【０００２】[0002]
【従来の技術】音の伝播速度が比較的速い物質にて高速
伝播部を形成すると共に、音の伝播速度が遅い物質で低
速伝播部を構成し、低速伝播部を通過した音の位相が高
速伝播部を通過した音の位相と逆となる厚さに低速伝播
部を形成した消音装置を特開平５−１５０７９１号公報
として本出願人が開示している。また、騒音源から伝播
する騒音の一部を中空管路を通過させることにより屈折
させ、位相がずれた伝播音と、騒音源からの直接伝播音
とを干渉させて減音領域を生じさせるような管路長差を
有する複数個の中空体を、騒音の伝播方向に配置した騒
音低減装置において、騒音源に対向して位置する騒音入
射側面のみに吸音性を具備させた騒音低減装置が、実開
昭５９−９４００号公報に開示されている。2. Description of the Related Art A high-speed propagation portion is formed of a material having a relatively high sound propagation speed, and a low-speed propagation portion is formed of a material having a low sound propagation speed, so that the phase of sound passing through the low-speed propagation portion is high. The present applicant discloses, as Japanese Patent Laid-Open No. 5-150791, a muffling device in which a low-speed propagation portion is formed in a thickness that is opposite to the phase of the sound that has passed through the propagation portion. In addition, a part of the noise propagating from the noise source is refracted by passing through the hollow pipe, and the propagating sound with a phase difference and the direct propagating sound from the noise source are interfered with each other to generate a noise reduction region. In a noise reduction device in which a plurality of hollow bodies having such pipe length differences are arranged in the direction of noise propagation, a noise reduction device having sound absorbing properties only on the noise incident side surface facing the noise source is known. No. 59-9400.
【０００３】[0003]
【発明が解決しようとする課題】一方、車両の音源から
の防音機構としては、アンダーカバーが公知であるが、
このアンダーカバーは通常吸音層と遮音層で構成されて
いる（図６参照）。すなわち、グラスウール、ウレタン
等より構成され音源３に対向して配設される吸音層５に
音源３からの音が吸音され、さらに吸音層５の背面に配
設される遮音層７で音は遮断されるよう構成されてい
る。このような構成のアンダーカバーを車両の音源の付
近に装着すると、通気性が悪化する。例えば、エンジン
など熱を発生する場所においては、アンダーカバーを配
設したことにより、熱害、例えばエンジンのオーバーヒ
ート等が発生する不都合があった。On the other hand, an undercover is known as a soundproof mechanism from a sound source of a vehicle.
This undercover is usually composed of a sound absorbing layer and a sound insulating layer (see FIG. 6). That is, sound from the sound source 3 is absorbed by the sound absorbing layer 5 that is made of glass wool, urethane, or the like and that faces the sound source 3, and the sound is blocked by the sound insulating layer 7 that is provided on the back surface of the sound absorbing layer 5. Is configured. If the under cover having such a structure is mounted near the sound source of the vehicle, the air permeability is deteriorated. For example, in a place where heat is generated, such as an engine, there is a disadvantage that heat damage, such as engine overheating, occurs due to the provision of the undercover.
【０００４】そこで、本発明は上記問題点を解決するた
め、通気性を有しながら車両騒音を低減させることがで
きる干渉型遮蔽用防音装置を提供するものである。In order to solve the above problems, the present invention provides an interference-type shielding soundproofing device which has a breathable property and can reduce vehicle noise.
【０００５】[0005]
【課題を解決するための手段】本発明の車両の音源に対
して配設する防音装置は、音源側から装置の反対側に貫
通する流通孔と、音源側に穿孔する上面開口と、音源の
反対側に穿孔され上面開口とは相対峙しない位置に形成
される下面開口と、上面開口と下面開口との間に形成さ
れる音伝達空間とを有した構成を具備する。そして、流
通孔は通気作用をなすと共に、防音装置から放射される
音は流通孔から放射する第１の音と、上面開口から入射
し音伝達空間を通過し下面開口から放射する第２の音と
を有し、第１の音と第２の音は互いに干渉して放射音が
低減される構成となっている。A soundproofing device provided for a sound source of a vehicle according to the present invention includes a through hole penetrating from the sound source side to the opposite side of the device, an upper surface opening for punching the sound source side, and a sound source It is provided with a structure having a lower surface opening that is formed on the opposite side and formed at a position that does not face the upper surface opening, and a sound transmission space formed between the upper surface opening and the lower surface opening. The circulation hole has a ventilation effect, and the sound emitted from the soundproof device is the first sound emitted from the circulation hole and the second sound emitted from the upper surface opening and passing through the sound transmission space and emitted from the lower surface opening. And the first sound and the second sound interfere with each other to reduce the emitted sound.
【０００６】また、上面開口と下面開口との水平方向の
距離Ｌは低減対象周波数の波長λに対して、Ｌ＝１／２
λとしてなる構成、あるいは、流通孔の開口面積の総和
と、上面開口と下面開口との開口面積の総和は等しい構
成、または、音伝達空間に上面開口と下面開口とを連絡
する案内壁を形成する構成を有する。The horizontal distance L between the upper opening and the lower opening is L = 1/2 with respect to the wavelength λ of the frequency to be reduced.
λ, or the sum of the opening areas of the flow holes and the sum of the opening areas of the upper surface opening and the lower surface opening are equal, or a guide wall that connects the upper surface opening and the lower surface opening is formed in the sound transmission space. Has a configuration.
【０００７】[0007]
【発明の実施の形態】本発明の車両の防音装置を図面を
参照して詳述する。図１は防音装置の平面図、図２はそ
の側面図、図３は図１の線Ａ−Ａ断面図である。防音装
置１０は基板１１と、基板１１に立設される矩形函状の
音通過函１３とを有する。この実施の形態に示す基板１
１上の音通過函１３は９個配設されている。各音通過函
１３の上面には、その中央に位置して上面貫通口１３０
が開口されている。さらに上面貫通口１３０を中心とし
て対角線上両側に２個の丸孔を穿孔し、上面丸孔１３
３，１３５とする。BEST MODE FOR CARRYING OUT THE INVENTION A soundproofing device for a vehicle according to the present invention will be described in detail with reference to the drawings. 1 is a plan view of the soundproof device, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view taken along the line AA of FIG. The soundproof device 10 has a substrate 11 and a rectangular box-shaped sound passage box 13 provided upright on the substrate 11. Substrate 1 shown in this embodiment
Nine sound passage boxes 13 on 1 are arranged. The upper surface of each sound passage box 13 is located at the center of the upper surface through hole 130.
Is opened. Further, two circular holes are formed on both sides of the diagonal line centering on the upper surface through hole 130, and the upper surface circular hole 13 is formed.
3,135.
【０００８】基板１１には音通過函１３の上面貫通口１
３０に対応した位置に基板側貫通口１１０を開口する。
そして、上面貫通口１３０に貫通する流通路１５０を形
成する。さらに、音通過函１３における丸孔形成対角線
と直交する対角線上両側に、貫通口１１０を中心として
２個の丸孔を穿孔し、基板側丸孔１１３，１１５とす
る。さらに、音貫通函１３は流通路１５０から音貫通函
１３側壁に至る案内壁１７を配設している。このよう
に、防音装置１０の上面、および下面には貫通口１１
０，１３０が９個、丸孔１１３，１１５，１３３，１３
５がそれぞれ１８個配設され、貫通口１１０，１３０の
開口面積の合計と、丸孔１１３，１１５，１３３，１３
５の開口面積の合計がほぼ等しく形成されている。The substrate 11 has a through hole 1 on the upper surface of the sound passage box 13.
The substrate-side through hole 110 is opened at a position corresponding to 30.
Then, the flow passage 150 penetrating the upper surface through hole 130 is formed. Further, two round holes centering on the through hole 110 are formed on both sides of a diagonal line orthogonal to the round hole forming diagonal line in the sound passage box 13 to form substrate side round holes 113, 115. Further, the sound penetrating box 13 has a guide wall 17 extending from the flow passage 150 to the side wall of the sound penetrating box 13. As described above, the through hole 11 is provided on the upper surface and the lower surface of the soundproofing device 10.
Nine 0, 130, round holes 113, 115, 133, 13
18 are provided for each of 5 and the total opening area of the through holes 110, 130 and the round holes 113, 115, 133, 13
The total of the opening areas of 5 are formed to be substantially equal.
【０００９】次に、上記防音装置の騒音低減機構を説明
する（図１〜４参照）。防音装置１０の音貫通函１３上
面を音源に対向して配設する。通常の場合、防音装置１
０の上面貫通口１３０と下面貫通口１１０を連絡する流
通路１５０は通気孔としての作用を実行する。そして、
音源からの音は、音通過函１３の上面貫通口１３０、お
よび上面丸孔１３３，１３５から函内に入射する。音通
過函１３の上面貫通口１３０から入射した音Ａ1は流通
路１５０を通って防音装置１０外に放射される（第１の
音）。音通過函１３の上面丸孔１３３から入射した音Ａ
2は、案内壁１７に案内されて下面丸孔１１３から、上
面丸孔１３５から入射した音Ａ3は、案内壁１７に案内
されて下面丸孔１１５から放射される（第２の音）。こ
のとき、入射音の波長がλであるとき、上面丸孔１３
３，１３５の中心から下面丸孔１１３，１１５の中心の
距離Ｌを１／２λとすると、流通路１５０からの第１の
音Ａ1に対して、下面丸孔１１３からの第２の音Ａ2、下
面丸孔１１５からの第２の音Ａ3は半波長ずれ、１／２
λの時間遅延となる。これは第１の音に対して第２の音
は位相が１８０度遅れたこととなり、互いに干渉を越し
放射音は低減される。Next, the noise reduction mechanism of the soundproofing device will be described (see FIGS. 1 to 4). The upper surface of the sound penetrating box 13 of the soundproof device 10 is arranged so as to face the sound source. Soundproofing device 1
The flow passage 150 connecting the upper surface through hole 130 and the lower surface through hole 110 of 0 performs the function as a ventilation hole. And
The sound from the sound source enters the box through the upper surface through hole 130 of the sound passage box 13 and the upper surface round holes 133 and 135. The sound A 1 incident from the upper surface through hole 130 of the sound passage box 13 is emitted to the outside of the soundproofing device 10 through the flow passage 150 (first sound). Sound A incident through the round hole 133 on the upper surface of the sound passage box 13
2 is guided by the guide wall 17 to enter from the lower surface round hole 113, and the sound A 3 incident from the upper surface round hole 135 is guided to the guide wall 17 and is emitted from the lower surface round hole 115 (second sound). At this time, when the wavelength of the incident sound is λ, the upper surface circular hole 13
If the distance L from the center of 3,135 to the center of the lower surface circular holes 113, 115 is 1 / 2λ, the second sound A from the lower surface circular hole 113 is different from the first sound A 1 from the flow passage 150. 2 , the second sound A 3 from the lower surface round hole 115 is shifted by half a wavelength,
It becomes a time delay of λ. This means that the phase of the second sound is delayed by 180 degrees with respect to the first sound, and the emitted sound is reduced by interfering with each other.
【００１０】すなわち、音源からの音は、防音装置１０
を通過すると、流通路１５０を通過した音Ａ1と、丸孔
１３３，１３５から音通過函１３内を通り半波長ずれ、
１／２λの時間遅延した音Ａ2，音Ａ3とが干渉しあっ
て、音量が減量される。このとき、貫通口１１０，１３
０の開口面積の合計と、丸孔１１３，１１５，１３３，
１３５の開口面積の合計がほぼ等しく形成されているの
で、流通路１５０を通過した音波と、丸孔１３３，１３
５から音通過函１３内を通り半波長ずれて排出する音波
が等しく、干渉作用が高く、音低減効果が最大となる。That is, the sound from the sound source is transmitted to the soundproof device 10.
, The sound A 1 that has passed through the flow passage 150 and half-wavelength shift from the round holes 133 and 135 through the sound passage box 13,
The sounds A 2 and A 3 delayed by 1 / 2λ interfere with each other and the volume is reduced. At this time, the through holes 110, 13
0 total opening area and round holes 113, 115, 133
Since the total opening area of 135 is formed to be substantially equal, the sound wave passing through the flow passage 150 and the round holes 133, 13 are formed.
The sound waves emitted from No. 5 through the sound passage box 13 and displaced by a half wavelength are equal, the interference action is high, and the sound reduction effect is maximum.
【００１１】図５に周波数のことなる音による音圧低減
効果をグラフで示している。このグラフによれば、周波
数１から２ＫＨＺにおいて、音圧の低減効果が顕著に表
れている。FIG. 5 is a graph showing the sound pressure reduction effect due to sounds having different frequencies. According to this graph, the sound pressure reducing effect is remarkably exhibited in the frequencies 1 to 2 KHZ.
【００１２】以上説明したように、この防音装置１０は
音、および空気が直接流通できる流通路１５０の他に、
低減対象の音の周波数の波長λとすると、音入射部と音
排出口との距離Ｌを１／２λとした丸孔を配設すること
により、丸孔を通過する音は低減対象周波数が半波長ず
らされ、流通路からの貫通音波と干渉し音が低減され
る。ただし、対象とする周波数はチューニングにより適
宜変更できる。また、上面、下面貫通口の径、および各
丸孔の径は低減対象周波数の波長より小さい寸法である
ことが望ましい。その理由は、防音装置を通過した音は
通過口、丸孔の径が小さい方が無指向性となるので、互
いに干渉され易くなるからであり、実験の結果、上面、
下面貫通口の径、および各丸孔の径は１／４λ以下が好
ましい。As described above, the soundproofing device 10 has, in addition to the flow passage 150 through which sound and air can directly flow,
Assuming that the wavelength λ of the frequency of the sound to be reduced is a round hole having a distance L between the sound incident part and the sound outlet of 1 / 2λ, the sound passing through the round hole has a frequency to be reduced by half. The wavelength is shifted, and the sound is reduced by interfering with the penetrating sound wave from the flow passage. However, the target frequency can be appropriately changed by tuning. Further, it is desirable that the diameters of the upper and lower through holes and the diameter of each round hole are smaller than the wavelength of the frequency to be reduced. The reason is that the sound that has passed through the soundproofing device is omnidirectional when the diameter of the passage opening and the round hole is small, so that they are likely to interfere with each other.
It is preferable that the diameter of the lower surface through hole and the diameter of each round hole be 1 / 4λ or less.
【００１３】なお、この実施の形態では各音貫通函の貫
通口、丸孔の径は同一として説明しているが、低減対象
とする周波数に幅を持たせる場合は、貫通孔、丸孔の径
寸法を変える、あるいは上面、下面の丸孔の間隔Ｌを変
更させて複数の間隔で形成することにより対応すること
が出来る。また、この場合、貫通口と貫通口に対応する
丸孔の総面積は等しくなるように設計することが望まし
い。また、この実施の形態では音通過函を音源に対向さ
せて配設しているが、防音装置の上面、下面の開口面積
は同一であり、開口位置も対称となっているので、音低
減効果に方向性がなく、どちら側を音源に対向させて配
設しても同様の効果を生じる装置であり、取付作業性が
向上する。In this embodiment, the diameters of the through holes and the round holes of the sound penetration boxes are the same, but when the frequency to be reduced has a width, the through holes and the round holes have the same diameter. This can be dealt with by changing the diameter dimension or changing the distance L between the upper and lower round holes to form a plurality of distances. Further, in this case, it is desirable that the through holes and the round holes corresponding to the through holes are designed to have the same total area. Further, in this embodiment, the sound passage box is arranged so as to face the sound source, but since the opening areas of the upper surface and the lower surface of the soundproofing device are the same and the opening positions are symmetrical, the sound reducing effect is reduced. The device has no directivity, and the same effect can be obtained regardless of which side is arranged so as to face the sound source, and mounting workability is improved.
【００１４】[0014]
【発明の効果】本発明の防音装置は、通気孔により換気
できるので、防音装置を配設したことによる熱害、例え
ばエンジンのオーバーヒート等を発生することがない。
また、防音装置は音、および空気が直接流通できる通路
の他に、音入射部と音排出口との距離Ｌを１／２λとし
た丸孔を配設することにより、丸孔を通過する音は低減
対象周波数が半波長ずらされ、流通路からの貫通音波と
干渉し音が低減される。さらに、低減対象周波数は丸孔
の配設位置を変更することで対応でき、複数の間隔を異
ならせた丸孔を形成することにより、低減対象周波数の
範囲を拡大させることができる。Since the soundproofing device of the present invention can be ventilated by the ventilation holes, heat damage due to the installation of the soundproofing device, for example, overheating of the engine will not occur.
In addition to the passage through which sound and air can directly flow, the soundproof device has a round hole having a distance L between the sound incident part and the sound outlet of 1 / 2λ, so that the sound passing through the round hole is reduced. The frequency to be reduced is shifted by a half wavelength, and the sound is reduced by interfering with the penetrating sound wave from the flow passage. Further, the frequency to be reduced can be dealt with by changing the arrangement position of the round holes, and the range of the frequency to be reduced can be expanded by forming a plurality of round holes with different intervals.
【図１】防音装置の平面図。FIG. 1 is a plan view of a soundproof device.
【図２】防音装置の側面図。FIG. 2 is a side view of the soundproof device.
【図３】図１線ＡーＡ断面図。FIG. 3 is a sectional view taken along line AA of FIG.
【図４】防音装置の作用説明図。FIG. 4 is an operation explanatory view of the soundproof device.
【図５】音の低減効果を示すグラフ。FIG. 5 is a graph showing a sound reduction effect.
【図６】従来のアンダーカバーの説明図。FIG. 6 is an explanatory view of a conventional under cover.
１０ 防音装置 １１ 基板 １３ 音通過函 １７ 案内壁 １１０ 下面貫通口 １１３，１１５ 下面丸孔 １３０ 上面貫通口 １３３，１３５ 上面丸孔 １５０ 流通路 10 Soundproofing device 11 board 13 sound passage box 17 guide wall 110 Bottom surface through hole 113,115 Round bottom hole 130 Top through hole 133,135 Round hole on top 150 passages
Claims (4)
て、 音源側から装置の反対側に貫通する流通孔と、音源側に
穿孔する上面開口と、音源の反対側に穿孔する下面開口
と、上面開口と下面開口との間に形成される音伝達空間
とを有し、 上面開口と下面開口は相対峙しない位置に形成されると
共に、音源からの音は流通孔から放射する第１の音と、
上面開口から入射し音伝達空間を通過し下面開口から放
射する第２の音とを有し、第１の音と第２の音は互いに
干渉して放射音が低減される車両の防音装置。1. A soundproofing device provided for a sound source, the through hole penetrating from the sound source side to the opposite side of the device, the upper surface opening drilled on the sound source side, and the lower surface opening drilled on the opposite side of the sound source. And a sound transmission space formed between the upper surface opening and the lower surface opening. The upper surface opening and the lower surface opening are formed at positions that do not face each other, and the sound from the sound source is radiated from the circulation hole. Sound of
A soundproof device for a vehicle, which has a second sound that is incident from the upper surface opening, passes through the sound transmission space, and is radiated from the lower surface opening, and the first sound and the second sound interfere with each other to reduce the radiated sound.
Ｌは低減対象周波数の波長λに対して、Ｌ＝１／２λと
してなる請求項１記載の車両の防音装置。2. The soundproofing device for a vehicle according to claim 1, wherein the horizontal distance L between the upper surface opening and the lower surface opening is L = 1 / 2λ with respect to the wavelength λ of the frequency to be reduced.
下面開口との開口面積の総和は等しく構成されてなる請
求項１記載の車両の防音装置。3. The soundproofing device for a vehicle according to claim 1, wherein the sum of the opening areas of the through holes is equal to the sum of the opening areas of the upper surface opening and the lower surface opening.
絡する案内壁を形成してなる請求項１記載の車両の防音
装置。4. The soundproof device for a vehicle according to claim 1, wherein a guide wall is formed in the sound transmission space to connect the upper opening and the lower opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05011097A JP3503395B2 (en) | 1997-03-05 | 1997-03-05 | Vehicle soundproofing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05011097A JP3503395B2 (en) | 1997-03-05 | 1997-03-05 | Vehicle soundproofing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10247086A JPH10247086A (en) | 1998-09-14 |
| JP3503395B2 true JP3503395B2 (en) | 2004-03-02 |
Family
ID=12849962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05011097A Expired - Fee Related JP3503395B2 (en) | 1997-03-05 | 1997-03-05 | Vehicle soundproofing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3503395B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008269673A (en) * | 2007-04-17 | 2008-11-06 | Hitachi Ltd | Disk array device |
| KR101422113B1 (en) * | 2013-04-26 | 2014-07-22 | 목포해양대학교 산학협력단 | Soundproof wall which has overlapped resonant chambers around air or water passage that makes air or water pass freely |
-
1997
- 1997-03-05 JP JP05011097A patent/JP3503395B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10247086A (en) | 1998-09-14 |
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