JPH05310389A - Elevator with noise eliminating device - Google Patents
Elevator with noise eliminating deviceInfo
- Publication number
- JPH05310389A JPH05310389A JP4115777A JP11577792A JPH05310389A JP H05310389 A JPH05310389 A JP H05310389A JP 4115777 A JP4115777 A JP 4115777A JP 11577792 A JP11577792 A JP 11577792A JP H05310389 A JPH05310389 A JP H05310389A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- car
- sound
- signal
- ceiling
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、乗かご内に生じる騒音
を低減するエレベータ乗かご内の消音装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for an elevator car that reduces noise generated in the car.
【０００２】[0002]
【従来の技術】エレベータ乗かご内の騒音の低減は、ロ
ープからの振動を吸振したり、かご枠を防振構造にして
乗かごに伝播する振動を防止したり、ガイド板等を設け
て渦流音や衝撃音を低減したりして、エレベータ乗かご
内に振動や騒音が伝播するのを防ぐための措置がとられ
ているエレベータ乗かごが案出されており、例えば、特
開昭56−141285号，特開昭57−48580号，特開昭57−903
80号，特開昭58−216878号公報に記載されたものがあ
る。2. Description of the Related Art Noise in an elevator car is reduced by absorbing vibrations from a rope, preventing vibrations from propagating to a car by providing a car frame with a vibration-proof structure, and providing a guide plate to prevent vortex flow. Elevator cars have been devised in which measures are taken to reduce the noise and impact noise and to prevent the propagation of vibrations and noises in the elevator cars. For example, JP-A-56- 141285, JP-A-57-48580, JP-A-57-903
80 and Japanese Patent Laid-Open No. 58-216878.
【０００３】[0003]
【発明が解決しようとする課題】従来の技術は、エレベ
ータ乗かごに振動や騒音が伝播するのを防ぐための措置
を施すことにより、乗かご内の騒音の低減を行うもの
で、有効な手段であるが、上記措置を行った結果、乗か
ご内に残る騒音に対しては、意匠上の問題から乗かご内
側に吸音材が貼れないため、吸音材による低騒音化が行
えない。The prior art is to reduce noise in the car by taking measures to prevent vibration and noise from propagating to the elevator car, which is an effective means. However, as a result of the above measures, the noise remaining in the car cannot be reduced because the sound absorbing material cannot be attached to the inside of the car due to a design problem.
【０００４】本発明の目的は、エレベータ乗かご内に生
じる騒音を低減できるエレベータの消音装置を提供する
ことにある。An object of the present invention is to provide an elevator muffler capable of reducing the noise generated in the elevator car.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
本発明は、天井，側板，床から成るエレベータ乗かごに
おいて、前記乗かごは、騒音信号または騒音信号と高い
相関をもつ信号を検出する検出手段と、前記検出手段に
よって検出された信号を処理する処理手段と、前記乗か
ご内の騒音を消音するための付加音を出力する発音手段
と、前記騒音と前記付加音とで合成される音を受音する
受音手段とを備え、前記発音手段および受音手段を乗か
ごの天井、または、床面と側面との接続部に設けること
によって、あるいは前記受音手段を乗かごの上下方向に
生じる音圧の１次モードの節および２次モードの上側の
節で囲まれた部分に少なくとも一つ設ける。In order to achieve the above object, the present invention provides an elevator car comprising a ceiling, side plates and a floor, wherein the car detects a noise signal or a signal having a high correlation with the noise signal. Detection means, processing means for processing the signal detected by the detection means, sounding means for outputting an additional sound for silencing the noise in the car, and the noise and the additional sound are combined. A sound receiving means for receiving sound, and by providing the sound generating means and the sound receiving means at a ceiling of a car or at a connecting portion between a floor surface and a side surface, or by providing the sound receiving means above and below the car. At least one is provided in the portion surrounded by the first-order mode node of the sound pressure generated in the direction and the upper-side node of the secondary mode.
【０００６】[0006]
【作用】騒音源に設けた振動センサ、または、流れの状
態を検出するセンサまたはマイクロホン等により制御す
る騒音信号または騒音信号と高い相関をもつ信号を検出
し、処理手段により検出した信号を処理し、処理した信
号は発音手段へ送られる。発音手段は送られてきた信号
により騒音を低減するための付加音を乗かご内へと出力
する。付加音と騒音とで合成される音は受音手段により
検出され、検出した信号は処理手段へ送られる。処理手
段では送られてきた信号をもとに次に発音手段へ送る信
号の補正を行い、この操作を繰り返し行い乗かご内の騒
音の低減を行う。A noise signal controlled by a vibration sensor provided in a noise source, a sensor for detecting a flow state or a microphone, or a signal having a high correlation with the noise signal is detected, and the detected signal is processed by the processing means. The processed signal is sent to the sounding means. The sounding means outputs an additional sound for reducing noise to the inside of the car according to the transmitted signal. The sound synthesized by the additional sound and the noise is detected by the sound receiving means, and the detected signal is sent to the processing means. The processing means corrects the signal to be sent next to the sounding means based on the signal sent, and repeats this operation to reduce the noise in the car.
【０００７】乗かご内に生じたこもり音に対しては、乗
かご内に生じる音圧モードの腹となる乗かごの天井また
は床面と側面との接続部に発音手段および受音手段を設
け、付加音を出力することにより効果的にこもり音を低
減する。また、人間の耳元付近の高さであり、こもり音
が生じた場合でも音圧モードの節とはならない、乗かご
の上下方向に生じる音圧の１次モードの節および２次モ
ードの上側の節で囲まれた部分に受音手段を設け、発音
手段より付加音を出力して、乗かご内の人間の耳元付近
の騒音を低減する。For the muffled sound generated in the car, a sounding means and a sound receiving means are provided at the connecting portion between the side surface and the ceiling or floor of the car, which is an antinode of the sound pressure mode generated in the car. , The muffled sound is effectively reduced by outputting the additional sound. In addition, it is the height near the human ear and does not become the node of the sound pressure mode even when a muffled sound is generated. The node of the primary mode of the sound pressure generated in the vertical direction of the car and the upper part of the secondary mode The sound receiving means is provided in the portion surrounded by the knots, and the additional sound is output from the sound generating means to reduce the noise in the vicinity of the human ear in the car.
【０００８】[0008]
【実施例】図１に、本発明による、エレベータ乗かご内
のこもり音を低減するスピーカとエラーマイクロホンの
配置についての実施例を示す。床６および側板７，８，
９，１０および天井１１から成る乗かご１２の、天井ま
たは床面と側板との稜線部もしくはその近傍である天井
１１のコーナ部分に、スピーカ４およびエラーマイクロ
ホン５を取付ける。スピーカ４は、音波干渉により騒音
を低減するための付加音を乗かご１２内に出力し、エラ
ーマイクロホン５は、騒音と付加音とで合成される音を
検出するために設けられている。こもり音は、エレベー
タ乗かごの寸法で定まる特定の周波数成分において、乗
かご１２内の騒音が大きくなる現象で、音圧は壁面で最
大となる。乗かご１２の天井１１のコーナ部分というの
は、図中に示すようにｘ，ｙ，ｚ方向をとると、必ず
ｘ，ｙ，ｚ方向での音圧モードの腹となるので、その最
大となる部分にスピーカ４およびエラーマイクロホン５
を設置して、効果的に乗かご１２内のこもり音を低減す
る。1 shows an embodiment of the arrangement of a speaker and an error microphone for reducing muffled noise in an elevator car according to the present invention. Floor 6 and side plates 7,8,
A speaker 4 and an error microphone 5 are attached to a corner portion of the ceiling 11, which is a ridgeline between the ceiling or the floor surface and the side plate or the vicinity thereof, of the car 12 including the cars 9 and 10 and the ceiling 11. The speaker 4 outputs an additional sound for reducing noise due to sound wave interference to the inside of the car 12, and the error microphone 5 is provided for detecting a sound synthesized by the noise and the additional sound. The muffled noise is a phenomenon in which noise in the car 12 increases at a specific frequency component determined by the size of the elevator car, and the sound pressure becomes maximum on the wall surface. The corner portion of the ceiling 11 of the car 12 is always the antinode of the sound pressure mode in the x, y, z directions when the x, y, z directions are taken, as shown in the figure, and therefore the maximum. 4 and the error microphone 5
Is installed to effectively reduce the muffled sound in the car 12.
【０００９】図２は、乗かご１２内にこもり音が生じる
ときの音圧モードの一例である。図は、乗かごの上下方
向に生じる１次の音圧モードを示し、図中に示される線
分２２は、音圧を示している。FIG. 2 shows an example of the sound pressure mode when a muffled sound is generated in the car 12. The figure shows a primary sound pressure mode occurring in the vertical direction of the car, and the line segment 22 shown in the figure shows the sound pressure.
【００１０】図３に、本発明による、エレベータ乗かご
内の騒音を低減するエラーマイクロホンの配置について
の実施例を示す。床６および側板７，８，９，１０およ
び天井１１から成る乗かご１２の側板７，８，９，１０
の、乗かごの上下方向に生じる音圧の１次モードの節と
２次モードの上側の節で囲まれた部分に、騒音とスピー
カ４から出力される付加音とで合成される音を受音する
エラーマイクロホン５を取付ける。音圧モードの節の位
置にエラーマイクロホンを取付けてもモードの音がとら
えられないので消音効果が得られないが、音圧モードの
節の位置は、こもり音が生じた場合でも、音圧の節とは
ならないので、効果的に騒音を低減する。また、音圧モ
ードの節の位置は人間が直立した場合の耳の高さとな
り、図４に示すように、乗かご１２内に生じる騒音にお
いて、乗客が騒音として感じるのは、図中の斜線部１７
で示した、人間が直立した場合の耳元の高さにおけるも
のであるので、この斜線で示される領域における騒音を
低減すれば、乗客が感じる騒音を低減できる。また、受
音手段であるエラーマイクロホン５を、この騒音低減を
行う領域に取付ける際に、１カ所だけに取付けただけで
は低減する部分が水平方向の領域であるか垂直方向の領
域であるかの判断がつかないため、側板７，８，９，１
０上に少なくとも３カ所取り付け、騒音を低減する領域
を決定する。図５は、エラーマイクロホン５を乗かごの
側板上ではなく、空間中に設置する場合の実施例につい
て示す。エラーマイクロホン５は支持材１８により天井
１１から吊り下げられる形で支持され、騒音を低減する
領域に多数存在し、スピーカ４からの付加音と騒音源か
らの騒音とで合成される音を受音する。また、図３およ
び図５において、付加音を出力するスピーカ４の位置
は、乗かごの天井１１，側板７，８，９，１０，床６の
任意の位置に取付ける。FIG. 3 shows an embodiment of an arrangement of error microphones for reducing noise in an elevator car according to the present invention. Side plates 7, 8, 9, 10 of a car 12 consisting of floor 6 and side plates 7, 8, 9, 10 and ceiling 11
Of the sound pressure generated in the up-and-down direction of the car receives a sound synthesized by the noise and the additional sound output from the speaker 4 in the portion surrounded by the first-mode node and the upper node of the secondary mode. Install the error microphone 5 that sounds. Even if an error microphone is attached to the position of the node in the sound pressure mode, the sound of the mode cannot be captured, so the muffling effect cannot be obtained.However, the position of the node in the sound pressure mode does not suppress the sound pressure even if a muffled sound occurs. Since it does not become a node, it effectively reduces noise. Further, the position of the node in the sound pressure mode is the height of the ear when a person stands upright, and as shown in FIG. 4, in the noise generated in the car 12, what passengers perceive as noise is the diagonal line in the figure. Part 17
Since it is at the height of the ears when the person stands upright, the noise felt by the passenger can be reduced by reducing the noise in the hatched region. Further, when the error microphone 5 which is the sound receiving means is attached to the area where the noise is reduced, it is determined whether the reduced portion is a horizontal area or a vertical area when it is attached only at one place. Side plate 7,8,9,1
Install at least 3 places on the zero to determine the noise reduction area. FIG. 5 shows an embodiment in which the error microphone 5 is installed not in the side plate of the car but in the space. The error microphones 5 are supported by the support member 18 in a manner of being suspended from the ceiling 11, and are present in a large number in a noise reducing region, and receive a sound synthesized by the additional sound from the speaker 4 and the noise from the noise source. To do. Further, in FIGS. 3 and 5, the position of the speaker 4 for outputting the additional sound is attached to an arbitrary position on the ceiling 11, side plates 7, 8, 9, 10, and floor 6 of the car.
【００１１】図６は、エレベータを２：１ローピングで
運転する場合の、本発明による消音装置の実施例を示
す。装置は、振動を感知する振動センサ１，信号処理を
行うコントローラ３，付加音を出力するスピーカ４，騒
音と付加音との合成音を受音するエラーマイクロホン５
より成っている。乗かご１２はケージプーリ１３および
クロスヘッド１４およびスリング１５および床６から成
るかご枠と、側板７，８，９，１０，床６，天井１１か
ら成る乗かご１２から成っている。ロープ１６がケージ
プーリ１３の溝をたたくときの振動およびガイドローラ
２１が転動するときの振動が騒音源となるので、ここに
振動センサ１を設置して、騒音に対してのリファレンス
信号を得る。コントローラ３は、得られたリファレンス
信号を処理して、処理した信号をスピーカ４に送る。ス
ピーカ４は送られてきた信号による付加音を乗かご１２
内に出力することにより騒音の低減を行う。また、騒音
源からの騒音とスピーカ４より出力した付加音とで合成
される音をエラーマイクロホン５により検出し、この検
出した信号をコントローラ３に送る。コントローラ３に
おいては、エラーマイクロホン５からの信号により、次
にスピーカ４へ出力する信号の補正を行い、これを順次
繰り返して、乗かご１２内の騒音を低減し、乗客に対す
る不快な騒音を低減する。FIG. 6 shows an embodiment of the silencer according to the invention when the elevator is operated with 2: 1 roping. The device is a vibration sensor for detecting vibration 1, a controller for signal processing, a speaker for outputting additional sound, an error microphone 5 for receiving a synthesized sound of noise and additional sound.
Is made up of. The car 12 includes a car frame composed of a cage pulley 13, a crosshead 14, a sling 15 and a floor 6, and a car 12 composed of side plates 7, 8, 9, 10, a floor 6 and a ceiling 11. Since the vibration when the rope 16 hits the groove of the cage pulley 13 and the vibration when the guide roller 21 rolls are noise sources, the vibration sensor 1 is installed here to obtain a reference signal for noise. The controller 3 processes the obtained reference signal and sends the processed signal to the speaker 4. The speaker 4 adds an additional sound based on the transmitted signal to the car 12
The noise is reduced by outputting it inside. The error microphone 5 detects a sound composed of the noise from the noise source and the additional sound output from the speaker 4, and sends the detected signal to the controller 3. In the controller 3, the signal from the error microphone 5 is used to correct the signal to be output next to the speaker 4, and this is repeated sequentially to reduce the noise in the car 12 and reduce the unpleasant noise for passengers. ..
【００１２】図７は、渦流音の防止板が設置されている
エレベータにおいての、本発明による消音装置の実施例
を示す。装置は、流れの状態を感知する渦度センサ２，
信号処理を行うコントローラ３，付加音を出力するスピ
ーカ４，騒音と付加音との合成音を受音するエラーマイ
クロホン５より成っている。ガイド板１９は、昇降路２
０内を乗かご１２が昇降する際に生じる渦流音を防止す
るために設けられており、ガイド板１９の先端部分に渦
度センサ２を取り付ける。先端部分に取付けることによ
り、センサと乗かごとの距離がとれるので、乗かごに騒
音が伝達するまでの間に、センサで得られる信号を処理
するための時間が得られる。この処理を行うことによ
り、乗かご１２内の騒音を低減し、乗かご内に生じる不
快な音を低減する。FIG. 7 shows an embodiment of the silencer according to the present invention in an elevator in which a vortex noise prevention plate is installed. The device comprises a vorticity sensor 2, which senses the flow condition.
It is composed of a controller 3 that performs signal processing, a speaker that outputs an additional sound, and an error microphone 5 that receives a synthesized sound of noise and an additional sound. The guide plate 19 is for the hoistway 2
The vorticity sensor 2 is provided to prevent vortex noise generated when the car 12 moves up and down in 0, and the vorticity sensor 2 is attached to the tip portion of the guide plate 19. By mounting the sensor at the tip portion, the distance between the sensor and the car can be maintained, so that time for processing the signal obtained by the sensor can be obtained before the noise is transmitted to the car. By performing this process, the noise in the car 12 is reduced, and the unpleasant sound generated in the car is reduced.
【００１３】本発明による消音装置の効果を計算した一
例を図８に示す。図は乗かご１２の上下方向（ｚ方向）
に１次の音圧モードが生じた場合の、人間の耳元の高さ
である床６から１.５ｍ の高さの平面においての、本発
明による消音装置の作動前後における音圧の減衰量分布
を示しており、全体的に２０ｄＢ以上の減音効果が得ら
れている。FIG. 8 shows an example of calculation of the effect of the muffler according to the present invention. The figure shows the vertical direction of the car 12 (z direction).
Distribution of sound pressure before and after the operation of the silencer according to the present invention in a plane at a height of 1.5 m from the floor 6 which is the height of the human ear when the first sound pressure mode occurs in The noise reduction effect of 20 dB or more is obtained as a whole.
【００１４】[0014]
【発明の効果】本発明による消音装置付エレベータは、
乗かご内に生じる騒音を低減することができるので、乗
客に与える不快な騒音を低減することができ、乗心地を
向上させることができる。The elevator with a silencer according to the present invention,
Since the noise generated in the car can be reduced, the unpleasant noise given to passengers can be reduced and the riding comfort can be improved.
【図１】乗かご内のこもり音を低減するスピーカとエラ
ーマイクロホンの配置を示す斜視図。FIG. 1 is a perspective view showing an arrangement of a speaker and an error microphone for reducing muffled sound in a car.
【図２】乗かご内に生じるこもり音の音圧モードの一例
を示す説明図。FIG. 2 is an explanatory diagram showing an example of a sound pressure mode of a muffled sound generated in a car.
【図３】乗かご内の騒音を低減するスピーカとエラーマ
イクロホンの配置を示す斜視図。FIG. 3 is a perspective view showing an arrangement of a speaker and an error microphone that reduce noise in a car.
【図４】乗かご内の騒音の低減を行う領域を示す説明
図。FIG. 4 is an explanatory diagram showing a region for reducing noise in a car.
【図５】乗かご内の騒音を低減するエラーマイクロホン
の配置を示す説明図。FIG. 5 is an explanatory view showing an arrangement of error microphones for reducing noise in a car.
【図６】２：１ローピングにおける乗かご内の騒音を低
減する一例を示す説明図。FIG. 6 is an explanatory diagram showing an example of reducing noise in a car in 2: 1 roping.
【図７】渦流音に起因する乗かご内の騒音を低減する一
例を示す説明図。FIG. 7 is an explanatory diagram showing an example of reducing the noise in the car due to the vortex sound.
【図８】本発明の消音装置の効果を計算した結果の一例
を示す説明図。FIG. 8 is an explanatory diagram showing an example of a result of calculating the effect of the silencer of the present invention.
１…振動センサ、２…渦度センサ、３…コントローラ、
４…スピーカ、５…エラーマイクロホン、１２…乗か
ご。1 ... Vibration sensor, 2 ... Vorticity sensor, 3 ... Controller,
4 ... speaker, 5 ... error microphone, 12 ... car basket.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岩瀬 幸司 茨城県土浦市神立町502番地 株式会社日 立製作所機械研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Iwase 502, Kazunachi-cho, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd.
Claims (1)
て、乗かごに、騒音信号または前記騒音信号と高い相関
をもつ信号を検出する検出手段と、前記検出手段によっ
て検出された信号を処理する処理手段と、前記乗かご内
の騒音を消音するための付加音を出力する発音手段と、
前記騒音と前記付加音とで合成される音を受音する受音
手段とを備え、前記発音手段および前記受音手段は前記
乗かごの天井または床面と側面との接続部に設けられて
いることを特徴とする消音装置付エレベータ。1. An elevator comprising a ceiling, a side plate, and a floor, in a car, a detection means for detecting a noise signal or a signal having a high correlation with the noise signal, and a processing for processing the signal detected by the detection means. Means and sounding means for outputting an additional sound for silencing the noise in the car,
A sound receiving means for receiving a sound synthesized by the noise and the additional sound, and the sound generating means and the sound receiving means are provided at a connecting portion between a ceiling or a floor surface and a side surface of the car. Elevator with silencer, which is characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4115777A JPH05310389A (en) | 1992-05-08 | 1992-05-08 | Elevator with noise eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4115777A JPH05310389A (en) | 1992-05-08 | 1992-05-08 | Elevator with noise eliminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05310389A true JPH05310389A (en) | 1993-11-22 |
Family
ID=14670800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4115777A Pending JPH05310389A (en) | 1992-05-08 | 1992-05-08 | Elevator with noise eliminating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05310389A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11242488A (en) * | 1998-02-26 | 1999-09-07 | Toshiba Corp | Sound insulating device |
| US7062049B1 (en) | 1999-03-09 | 2006-06-13 | Honda Giken Kogyo Kabushiki Kaisha | Active noise control system |
| JP2008537166A (en) * | 2005-04-07 | 2008-09-11 | エアバス・ドイチュラント・ゲーエムベーハー | Active anti-sound system, active anti-sound device, active reduction of sound waves using a specific arrangement of secondary actuators to reduce the amount of sound passing in the open boundary between the two volumes Method of using an active counter-sound system to actively reduce sound waves to an at least partially open control volume |
| WO2010033103A1 (en) * | 2008-09-19 | 2010-03-25 | Otis Elevator Company | Actively controlled noise cancellation system for an elevator cab |
| JP2010155685A (en) * | 2008-12-26 | 2010-07-15 | Toshiba Elevator Co Ltd | Elevator device |
| JP2012250822A (en) * | 2011-06-03 | 2012-12-20 | Hitachi Building Systems Co Ltd | Elevator muffler |
| JP2015158542A (en) * | 2014-02-21 | 2015-09-03 | 学校法人慶應義塾 | Noise reduction method in closed space, and noise reduction system |
| CN105460750A (en) * | 2014-09-30 | 2016-04-06 | 株式会社日立制作所 | Elevator and car noise reduction method |
| CN106185551A (en) * | 2014-09-30 | 2016-12-07 | 株式会社日立制作所 | Noise reducing method in lift appliance and car |
| DE102017109060A1 (en) * | 2017-04-27 | 2018-05-17 | Thyssenkrupp Ag | An elevator apparatus comprising an elevator car having a system for suppressing noise in an elevator car |
-
1992
- 1992-05-08 JP JP4115777A patent/JPH05310389A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11242488A (en) * | 1998-02-26 | 1999-09-07 | Toshiba Corp | Sound insulating device |
| US7062049B1 (en) | 1999-03-09 | 2006-06-13 | Honda Giken Kogyo Kabushiki Kaisha | Active noise control system |
| US7254240B2 (en) | 1999-03-09 | 2007-08-07 | Honda Giken Kogyo Kabushiki Kaisha | Active noise control system |
| JP2008537166A (en) * | 2005-04-07 | 2008-09-11 | エアバス・ドイチュラント・ゲーエムベーハー | Active anti-sound system, active anti-sound device, active reduction of sound waves using a specific arrangement of secondary actuators to reduce the amount of sound passing in the open boundary between the two volumes Method of using an active counter-sound system to actively reduce sound waves to an at least partially open control volume |
| WO2010033103A1 (en) * | 2008-09-19 | 2010-03-25 | Otis Elevator Company | Actively controlled noise cancellation system for an elevator cab |
| JP2010155685A (en) * | 2008-12-26 | 2010-07-15 | Toshiba Elevator Co Ltd | Elevator device |
| JP2012250822A (en) * | 2011-06-03 | 2012-12-20 | Hitachi Building Systems Co Ltd | Elevator muffler |
| JP2015158542A (en) * | 2014-02-21 | 2015-09-03 | 学校法人慶應義塾 | Noise reduction method in closed space, and noise reduction system |
| CN105460750A (en) * | 2014-09-30 | 2016-04-06 | 株式会社日立制作所 | Elevator and car noise reduction method |
| JP2016071099A (en) * | 2014-09-30 | 2016-05-09 | 株式会社日立製作所 | Elevator device and method for reducing noise in car |
| CN106185551A (en) * | 2014-09-30 | 2016-12-07 | 株式会社日立制作所 | Noise reducing method in lift appliance and car |
| CN106185551B (en) * | 2014-09-30 | 2018-07-31 | 株式会社日立制作所 | Noise reducing method in lift appliance and car |
| DE102017109060A1 (en) * | 2017-04-27 | 2018-05-17 | Thyssenkrupp Ag | An elevator apparatus comprising an elevator car having a system for suppressing noise in an elevator car |
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