JPH05223335A - Active noise canceler - Google Patents
Active noise cancelerInfo
- Publication number
- JPH05223335A JPH05223335A JP4027685A JP2768592A JPH05223335A JP H05223335 A JPH05223335 A JP H05223335A JP 4027685 A JP4027685 A JP 4027685A JP 2768592 A JP2768592 A JP 2768592A JP H05223335 A JPH05223335 A JP H05223335A
- Authority
- JP
- Japan
- Prior art keywords
- duct
- noise
- sound
- detector
- recess
- 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.)
- Pending
Links
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Duct Arrangements (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ダクト内を伝播する騒
音に逆位相の音を重ね合わせ、積極的に消音する能動消
音装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active muffling apparatus which superimposes a sound having an opposite phase on a noise propagating in a duct to positively muffle the noise.
【０００２】[0002]
【従来の技術】近年、住居や事務所などに使用する送風
機や空調機は機器の騒音を低減することが求められてい
る。2. Description of the Related Art In recent years, it has been required to reduce noise of blowers and air conditioners used in houses and offices.
【０００３】従来、この種の能動消音装置は、騒音を低
減する消音装置として、ダクト内を伝播する騒音と逆位
相の音をダクト内に放出することで、騒音を積極的に消
去する能動消音装置が提案されており、特開昭６２−１
６４４００号公報に示すような構成が一般的であった。
以下、その構成について図３および図４を参照しながら
説明する。Conventionally, this type of active silencer is a silencer for reducing noise, which emits a sound having a phase opposite to that of the noise propagating in the duct into the duct, thereby actively canceling the noise. A device has been proposed, and is disclosed in JP-A-62-1.
The configuration shown in Japanese Patent No. 64400 has been common.
The configuration will be described below with reference to FIGS. 3 and 4.
【０００４】図に示すように、ダクト１０１内を伝播す
る騒音を検出する検出器１０２、および該検出器１０２
によって検出した騒音から逆位相の音を作りだす制御回
路１０３と、制御回路１０３で作り出された逆位相の音
を前記ダクト１０１内に放出する音波発振器１０４を設
け、ダクト１０１内の空気の流れの影響を受けずに騒音
検出が行えるように検出器１０２には、多孔質弾性材料
の乱流スクリーン１０５が取り付けられていたり、ダク
ト１０１内壁面に均一に張りめぐらせた吸音材１０６の
内部に検出器１０２が埋め込まれたりしている。As shown in the figure, a detector 102 for detecting noise propagating in the duct 101, and the detector 102.
The control circuit 103 for producing a sound having an opposite phase from the noise detected by the sound source and the sound wave oscillator 104 for emitting the sound having the opposite phase produced by the control circuit 103 into the duct 101 are provided, and the influence of the air flow in the duct 101 is provided. A turbulent flow screen 105 made of a porous elastic material is attached to the detector 102 so that noise can be detected without receiving the noise, or the detector is provided inside the sound absorbing material 106 evenly spread on the inner wall surface of the duct 101. 102 is embedded.
【０００５】上記構成によりダクト１０１内を伝播する
騒音と音波発振器から放射された音との音圧合成を行う
ことにより、騒音を消去させるものである。With the above-described structure, the noise propagating in the duct 101 and the sound radiated from the sound wave oscillator are subjected to sound pressure synthesis to eliminate the noise.
【０００６】[0006]
【発明が解決しようとする課題】このような従来の能動
消音装置では、ダクト１０１内に露出した検出器１０２
および乱流スクリーン１０５の存在によって、ダクト内
を通過する空気が乱れ、乱流騒音を発生するという問題
があった。In such a conventional active silencer, the detector 102 exposed in the duct 101 is provided.
Further, due to the existence of the turbulent flow screen 105, there is a problem that the air passing through the duct is disturbed and turbulent noise is generated.
【０００７】また、検出器１０２が吸音材１０６の内部
に埋められているため、検出される騒音信号の周波数特
性が吸音材により変質され、正しく検出できないという
問題があった。Further, since the detector 102 is embedded inside the sound absorbing material 106, there is a problem that the frequency characteristic of the noise signal to be detected is altered by the sound absorbing material and cannot be detected correctly.
【０００８】本発明は上記課題を解決するもので、ダク
ト内を通過する空気の乱れ、乱流騒音をなくすことを第
１の目的とする。The present invention solves the above problems, and a first object of the present invention is to eliminate turbulence and turbulent noise of air passing through a duct.
【０００９】第２の目的はダクト内に伝播する騒音を変
質させることなく検出することにある。The second purpose is to detect the noise propagating in the duct without degrading it.
【００１０】[0010]
【課題を解決するための手段】本発明の能動消音装置は
上記第１の目的を達成するために、第１の手段はダクト
内を伝播する騒音を検出する検出器、および該検出器に
よって検出された騒音と逆位相の音を作りだし、前記ダ
クト内に放出する音波発振器とを備え、前記ダクトの内
壁面の一部に凹部を設け、該凹部内に前記検出器を取り
付けるとともに、前記ダクトの内壁面が滑らかな同一面
となるように吸音性能を有さない多孔質弾性材料によっ
て覆ったことを特徴とする構成とする。In order to achieve the above first object, the active muffler of the present invention has a first means for detecting noise propagating in a duct, and a detector for detecting the noise. A sound wave oscillator for producing a sound in a phase opposite to that of the generated noise and emitting the sound into the duct, providing a recess in a part of the inner wall surface of the duct, and mounting the detector in the recess, and The structure is characterized in that the inner wall surface is covered with a porous elastic material having no sound absorbing property so that the inner wall surface is smooth and flush.
【００１１】また、第２の目的を達成するために、第２
の手段はダクトの内壁面に均一に張りめぐらせた吸音材
の一部に切り欠き部を設け、該切り欠き部に検出器を取
り付けるとともに、前記吸音材と滑らかな同一面となる
ように吸音性能を有さない多孔質弾性材料によって覆っ
たことを特徴とする構成とする。In order to achieve the second object, the second
The means is to provide a notch in a part of the sound absorbing material that is evenly spread over the inner wall surface of the duct, attach a detector to the notch, and absorb the sound so that it is on the same surface as the sound absorbing material. The structure is characterized by being covered with a porous elastic material having no performance.
【００１２】[0012]
【作用】本発明は上記した第１の手段の構成により、ダ
クト内壁面に凹部を設けこの凹部に検出器を取り付け、
吸音性能を有さない多孔質弾性材料によって前記ダクト
内壁面が滑らかな同一面になるように覆うことで、乱流
騒音の発生を防止することができる。According to the present invention, with the structure of the above-mentioned first means, a recess is provided in the inner wall surface of the duct, and a detector is attached to this recess
Generation of turbulent noise can be prevented by covering the inner wall surface of the duct with a smooth and uniform surface by a porous elastic material having no sound absorbing performance.
【００１３】また、第２の手段の構成により、ダクト内
壁面に均一に張りめぐらせた吸音材の切り欠き部に検出
器を取り付け、吸音性能を有さない多孔質弾性材料によ
って、前記ダクト内壁面が滑らかな同一面になるように
覆うことで、騒音信号の変質を防止することができる。According to the structure of the second means, the detector is attached to the notch of the sound absorbing material which is evenly spread on the inner wall surface of the duct, and the inside of the duct is made of the porous elastic material having no sound absorbing performance. By covering the walls so that they are on the same smooth surface, it is possible to prevent alteration of the noise signal.
【００１４】[0014]
【実施例】以下、本発明の第１実施例について、図１を
参照しながら説明する。なお従来例と同一箇所には同一
番号を付けて詳細な説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. The same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.
【００１５】図に示すようにダクト１０１内壁部に設け
られた凹部１と、ダクト１０１内を伝播する騒音を検出
するための検出器１０２と、この検出器１０２によって
検出した騒音の逆位相の音を作り出す制御回路１０３
と、この制御回路１０３によって作り出された音をダク
ト１０１内に放射する音波発振器１０４と、ダクト１０
１内壁面が滑らかな同一面となるように凹部１の空洞部
に取り付けられる連続発泡性の吸音性能を有さない多孔
質弾性材料２から構成されている。As shown in the figure, the recess 1 provided in the inner wall of the duct 101, the detector 102 for detecting the noise propagating in the duct 101, and the noise of the opposite phase of the noise detected by the detector 102. Control circuit 103 for producing
And a sound wave oscillator 104 for radiating the sound produced by the control circuit 103 into the duct 101, and the duct 10
1 is made of a continuous foaming porous elastic material 2 having no sound absorbing performance, which is attached to the hollow portion of the concave portion 1 so that the inner wall surface is smooth and flush.
【００１６】上記構成により、ダクト１０１の内を空気
の流れをともなって騒音が伝播しても、検出器１０２が
取り付けられている凹部１とダクト１０１内壁面の段差
は、多孔質弾性材料２によって滑らかな同一面となって
いるため、乱流騒音は発生しない。また、検出器１０２
は吸音性能を有さない多孔質弾性材料２で覆われている
ため、ダクト１０１内を伝播してきた騒音を変質させず
に検出できる。With the above structure, even if noise is propagated in the duct 101 with the flow of air, the step between the recess 1 in which the detector 102 is mounted and the inner wall surface of the duct 101 is made by the porous elastic material 2. No turbulent noise is generated because the surfaces are smooth. In addition, the detector 102
Is covered with the porous elastic material 2 having no sound absorbing performance, so that the noise propagating in the duct 101 can be detected without being deteriorated.
【００１７】このように本発明の第１実施例の能動消音
装置によれば、検出器１０２を取り付けた凹部１の空洞
部に多孔質弾性材料２を取り付けることで、ダクト内で
乱流騒音は発生しなく、また伝播する騒音を変質させる
ことなく検出することができる。As described above, according to the active noise suppressor of the first embodiment of the present invention, the turbulent noise is generated in the duct by attaching the porous elastic material 2 to the cavity of the recess 1 in which the detector 102 is attached. It is possible to detect the noise that does not occur and does not deteriorate the propagating noise.
【００１８】つぎに、本発明の第２実施例について、図
２を参照しながら説明する。なお第１実施例と同一箇所
には同一番号を付けて詳細な説明は省略する。Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００１９】図に示すようにダクト１０１内壁部に均一
に張りめぐらせた吸音材１０６の一部に設けられた切り
欠き部３と、ダクト１０１内を伝播する騒音を検出する
ための検出器１０２と、該検出器１０２によって検出し
た騒音の逆位相の音を作り出す制御回路１０３と、制御
回路１０３によって作り出された音をダクト１０１内に
放射する音波発振器１０４と、ダクト１０１内壁面が滑
らかな同一面となるように切り欠き部３の空洞部に取り
付けられる連続発泡性の吸音性能を有さない多孔質弾性
材料２から構成されている。As shown in the figure, the notch 3 provided in a part of the sound absorbing material 106 which is evenly spread over the inner wall of the duct 101, and the detector 102 for detecting the noise propagating in the duct 101. A control circuit 103 for producing a sound having a phase opposite to that of the noise detected by the detector 102; a sound wave oscillator 104 for radiating the sound produced by the control circuit 103 into the duct 101; The porous elastic material 2 is attached to the hollow portion of the cutout portion 3 so as to form a surface and has a continuous foaming property and does not have sound absorbing performance.
【００２０】上記構成により、ダクト１０１内を空気の
流れをともなって騒音が伝播しても、検出器１０２が取
り付けられている切り欠き部３と吸音材１０６の表面の
段差は、多孔質弾性材料２によって滑らかな同一面とな
っているため、乱流騒音は発生しない。また、検出器１
０２は吸音性能を有さない多孔質弾性材料２で覆われて
いるため、ダクト１０１内を伝播してきた騒音を変質さ
せずに検出できる。With the above structure, even if noise is propagated in the duct 101 with air flow, the step difference between the notch 3 to which the detector 102 is attached and the surface of the sound absorbing material 106 is made of a porous elastic material. No turbulent noise is generated because the surface is smooth by 2. Also, the detector 1
Since 02 is covered with the porous elastic material 2 having no sound absorbing performance, the noise propagating in the duct 101 can be detected without being deteriorated.
【００２１】このように本発明の第２実施例の能動消音
装置によれば、検出器１０２を取り付けた吸音材１０６
の一部に設けられた切り欠き部３の空洞部に多孔質弾性
材料２を取り付けることで、ダクト１０１内に伝播する
騒音を変質させることなく検出することができる。As described above, according to the active sound deadening system of the second embodiment of the present invention, the sound absorbing material 106 to which the detector 102 is attached is attached.
By attaching the porous elastic material 2 to the hollow portion of the cutout portion 3 provided in a part of the above, noise propagating in the duct 101 can be detected without being deteriorated.
【００２２】なお、実施例の吸音材はグラスウールまた
はロックウールまたはフェルトや独立発泡性ウレタンフ
ォームを用いてもよく、その作用効果に差異を生じな
い。The sound absorbing material of the embodiment may be made of glass wool, rock wool, felt or independent foaming urethane foam, and there is no difference in the function and effect.
【００２３】[0023]
【発明の効果】以上の実施例から明らかなように、本発
明によれば検出器を吸音性能を有しない多孔質弾性材料
で覆い、ダクト内壁面を滑らかな同一面としているの
で、乱流騒音が発生しない能動消音装置が提供できる。As is apparent from the above embodiments, according to the present invention, the detector is covered with a porous elastic material having no sound absorbing performance, and the inner wall surface of the duct is made into the same smooth surface. It is possible to provide an active silencer that does not generate noise.
【００２４】また、ダクト内に伝播する騒音を変質させ
ることなく検出することができる能動消音装置が提供で
きる。Further, it is possible to provide an active silencer capable of detecting the noise propagating in the duct without changing its quality.
【図１】本発明の第１実施例の能動消音装置の断面図FIG. 1 is a sectional view of an active silencer according to a first embodiment of the present invention.
【図２】同第２実施例の能動消音装置の断面図FIG. 2 is a sectional view of an active silencer of the second embodiment.
【図３】従来の能動消音装置の断面図FIG. 3 is a sectional view of a conventional active silencer.
【図４】同他の断面図FIG. 4 is another sectional view of the same.
１ 凹部 ２ 多孔質弾性材料 ３ 切り欠き部 1 Recess 2 Porous elastic material 3 Notch
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中間 保利 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 橋本 裕之 大阪府門真市大字門真1006番地 松下電器 産業株工株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nakahori 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hiroyuki Hashimoto, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Within
Claims (2)
器、および該検出器によって検出された騒音から逆位相
の音を作りだし前記ダクト内に放出する音波発振器とを
備え、前記ダクトの内壁面の一部に凹部を設け、該凹部
内に前記検出器を取り付けるとともに、前記ダクトの内
壁面が滑らかな同一面となるように吸音性能を有さない
多孔質弾性材料によって覆ったことを特徴とする能動消
音装置。1. An inner wall surface of the duct, comprising: a detector for detecting noise propagating in the duct; and a sound wave oscillator for producing a sound having an opposite phase from the noise detected by the detector and emitting the sound into the duct. Is provided with a recess, and the detector is mounted in the recess, and the inner wall surface of the duct is covered with a porous elastic material having no sound absorbing property so that the inner wall surface is smooth. Active silencer.
音材の一部に切り欠き部を設け、該切り欠き部に検出器
を取り付けるとともに、前記吸音材と滑らかな同一面と
なるように吸音性能を有さない多孔質弾性材料によって
覆ったことを特徴とする能動消音装置。2. A notch is provided in a part of the sound absorbing material which is uniformly stretched on the inner wall surface of the duct, and a detector is attached to the notch so that the sound absorbing material has the same smooth surface. An active silencer characterized in that it is covered with a porous elastic material that does not have sound absorbing performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4027685A JPH05223335A (en) | 1992-02-14 | 1992-02-14 | Active noise canceler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4027685A JPH05223335A (en) | 1992-02-14 | 1992-02-14 | Active noise canceler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05223335A true JPH05223335A (en) | 1993-08-31 |
Family
ID=12227826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4027685A Pending JPH05223335A (en) | 1992-02-14 | 1992-02-14 | Active noise canceler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05223335A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07334167A (en) * | 1994-06-07 | 1995-12-22 | Daidan Kk | Sensor device for active noise control system |
| US6078671A (en) * | 1996-09-05 | 2000-06-20 | Ebara Corporation | Silencer for attenuating a sound or noise transmitted through an air passage of a duct |
| US6648750B1 (en) * | 1999-09-03 | 2003-11-18 | Titon Hardware Limited | Ventilation assemblies |
-
1992
- 1992-02-14 JP JP4027685A patent/JPH05223335A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07334167A (en) * | 1994-06-07 | 1995-12-22 | Daidan Kk | Sensor device for active noise control system |
| US6078671A (en) * | 1996-09-05 | 2000-06-20 | Ebara Corporation | Silencer for attenuating a sound or noise transmitted through an air passage of a duct |
| US6648750B1 (en) * | 1999-09-03 | 2003-11-18 | Titon Hardware Limited | Ventilation assemblies |
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