WO2019007700A1 - Système de réduction de bruit - Google Patents

Système de réduction de bruit Download PDF

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Publication number
WO2019007700A1
WO2019007700A1 PCT/EP2018/066654 EP2018066654W WO2019007700A1 WO 2019007700 A1 WO2019007700 A1 WO 2019007700A1 EP 2018066654 W EP2018066654 W EP 2018066654W WO 2019007700 A1 WO2019007700 A1 WO 2019007700A1
Authority
WO
WIPO (PCT)
Prior art keywords
control loop
loudspeaker
value
helmholtz resonator
neck
Prior art date
Application number
PCT/EP2018/066654
Other languages
German (de)
English (en)
Inventor
Nicolas DRIOT
Dirk Wiemeler
Roland Moschel
Original Assignee
Tenneco Gmbh
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 Tenneco Gmbh filed Critical Tenneco Gmbh
Publication of WO2019007700A1 publication Critical patent/WO2019007700A1/fr

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1244—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound
    • F02M35/125—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound by using active elements, e.g. speakers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
    • F02M35/1261—Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3227—Resonators
    • G10K2210/32272—Helmholtz resonators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for operating a motor vehicle noise suppression system comprising a Helmholtz resonator with a Helmholtz chamber, a neck and a connection opening, a loudspeaker within the Helmho! Tzresonators, a variable variable resistance, which is connected to the speaker, a control unit for varying the variable complex resistance and comprising an ECU unit as part of the engine control for obtaining at least the rotational speed RPM as engine parameter, wherein the Helmholtz resonator is connectable via the neck to an exhaust or intake pipe of an internal combustion engine, wherein the speaker is the volume of the Helmholtz resonator limited.
  • a system having a Helmholtz resonator, in the end a speaker is placed.
  • the active system generates and / or influences vehicle noise, in particular engine noise, intake noise and exhaust noise.
  • the system further includes a controller that may process data from at least one downstream error microphone and a motor controller to calculate control signals for the speaker therefrom. Further, a control signal may be generated for a single tone with a constant fundamental frequency.
  • an intake noise damping system with an actively tuned Helmholtz resonator is known from EP 1 085 201 B1. Inside the Helmholtz resonator, a loudspeaker is installed that shares the volume of the Helmholtz resonator. The loudspeaker can be used to change the absorption frequency of the Helmholtz resonator. The control signal of the loudspeaker is only dependent on the motor frequency. This is detected by a frequency sensor.
  • the muffler has a Helmholtz resonator, on the rear wall of a speaker is provided.
  • the loudspeaker is controlled by a control unit. regulates which measurements are taken into account by a sound pressure transducer.
  • the speaker is controlled so that its vibrations affect the reflection properties on the back wall of the Helmholtz resonator. In this procedure, the acoustic resistance of the loudspeaker diaphragm is adjusted to control the resonant frequency of the Helmholtz resonator. An active generation of a sound wave is not provided.
  • a communication system is known. To suppress noise, a speaker is used as a sound sensor in this communication system.
  • a passive Helmholtz resonator for an exhaust system is known, whose impedance frequency is set by means of a loudspeaker placed on the back wall of the resonator.
  • discrete, sometimes complex resistors are provided, which are switched depending on the motor speed in order to ensure the highest possible sound attenuation.
  • a control unit controls the circuit of the resistors based on the speed.
  • US 2015/0303884 A1 shows a drive device for driving a loudspeaker, which comprises an amplifier, a voltmeter and a device for activating the diaphragm.
  • DE 42 26 885 A1 shows a sound absorption method for motor vehicles in which sound pressure values are generated by means of a loudspeaker and in which sound pressure is absorbed by means of a Helmholtz resonator, wherein cavity body volumes are simulated by the generated sound pressure values.
  • WO 2014/053994 A1 a system for broadband noise suppression is known. The noise reduction takes place in two steps. First, electrical, mechanical and acoustic parameters of the loudspeaker in the noise environment are determined.
  • these parameters are used to calculate the impedance to be connected to the speaker to control the speaker's acoustic response for noise suppression pretend.
  • the current voltage is measured on the loudspeaker, which is converted into a current via a transfer function. This current is applied to the loudspeaker.
  • the object of the invention is to design and arrange a motor vehicle noise suppression system in such a way that an improved effect is achieved.
  • engine noises, intake noises and exhaust noises are referred to as motor vehicle noises.
  • the object is achieved according to the invention by the fact that in order to obtain a value Zi for the acoustic impedance at the connection opening, first a value Z 2 for the acoustic impedance directly in front of the loudspeaker is obtained.
  • Z L -Z e + [Ohm] with Z e [Ohm] as the electrical impedance of the loudspeaker, Z m [kg / s] as the mechanical impedance of the loudspeaker, Bl [Tm] as the loudspeaker coil power factor, S [m 2 ] as Speaker surface, so that the noise at the connection opening are at least partially or largely extinguished.
  • the noise cancellation takes place in particular in the exhaust or inlet pipe in the region of the connection opening of the Helmholtz resonator.
  • the complex resistor is connected in parallel with the loudspeaker. In addition, the complex resistance can be infinitely adjusted to any value of the artificial impedance Z L.
  • At least one temperature sensor is provided, wherein the temperature value T is taken into account in the calculation of Z L and for this purpose an adaptation of the fluid characteristics l a , R a and / or C a takes place.
  • the propagation velocity of sound depends on the temperature of the medium in which the sound propagates.
  • At least one first temperature sensor is provided for measuring the temperature value T c in the Helmholtz chamber, wherein the fluid characteristic value C a is determined according to
  • the sound should be extinguished at one end of the Helmholtz resonator.
  • the extinction is mainly caused by the loudspeaker located at the opposite, other end of the Helmholtz resonator. Accordingly, the sound must pass through the Helmholtz chamber, which is why the consideration of this temperature is advantageous.
  • a second temperature sensor for measuring the temperature value T N is provided in the neck, the fluid characteristic l a is determined according to
  • the loudspeaker can be used, for example, to generate anti-sound, for which purpose the current voltage U (t) on the loudspeaker is determined by means of the control unit and as part of a signal analysis by a fast Fourier transformation U (oo). is obtained, the current ⁇ ( ⁇ ) is calculated using the transfer function 1 / Z L and ultimately this current is applied as a converted time signal l (t) on the speaker.
  • U (t) current voltage
  • U (oo) the current ⁇ ( ⁇ ) is calculated using the transfer function 1 / Z L and ultimately this current is applied as a converted time signal l (t) on the speaker.
  • the application of anti-sound eliminates residual noise despite the complex resistance control. This further improves the noise cancellation.
  • the regulation for the generation of the anti-noise is independent of the regulation of the complex resistance. The rules can therefore be parallel, but also sequential.
  • the current I (t) is provided via an electrical connection.
  • the voltage Uwi + i (t) or 1 ) ⁇ ( ⁇ ) is determined after application of the current I (t) and then a difference value ⁇ is calculated as the difference of U M + i and U M (t) and UM + I (CÜ) and U M (W), respectively, where the iteration loop is repeated until the difference value e is less than 1 or less than 0.1 or less than Is 0.001.
  • All time values or t values can be transformed into ⁇ values by Fast Fourier Transformation FFT. This signal analysis can be be tegraler part of the respective control block of the control unit or be integrated as a separate control block.
  • the recalculation of the angular frequency ⁇ is implemented in a main control loop and if the recalculation of the impedance Z L is implemented in a Z-control loop and if the Z-control loop in the Main control loop is integrated.
  • the recalculation of the impedance Z L then takes place on the basis of the current angular frequency ⁇ .
  • the determination of the voltage Uivi (t) at the loudspeaker, the calculation of the current ⁇ ( ⁇ ) and the application of the current I (t) to the loudspeaker is implemented in an I-control loop and if the I- Control loop is integrated into the main control loop, with the Z-control loop is placed before the I-control loop.
  • the current I (t) is optimized.
  • the I-control loop has a repetition frequency which is higher by a factor of 3 - 100 or 10 - 500 than the repetition frequency of the main control loop and / or the Z-control loop.
  • the iteration loop can be executed several times for a value Z L and the current I (t) can be optimized on the basis of Z L.
  • FIG. 1 Schematic representation of the noise reduction system
  • FIG. 2 a main control loop for setting the complex resistance
  • Figure 2b Z-control loop for controlling the complex resistance
  • Figure 2c I-control loop for optimizing the current l (t).
  • a noise suppression system 1 comprises a Helmholtz resonator 2.
  • the Helmholtz resonator 2 has a Helmholtz chamber 13 and a NEN neck 3, which is formed as a tube with a radius r and a length l n .
  • the neck 3 discharges via a connection opening 4 in an exhaust gas or intake pipe 9 of an internal combustion engine and couples these, in particular with respect to the sound with the Helmholtz chamber 13.
  • a loudspeaker 5 is provided which forms the rear wall of the Helmholtz resonator 2.
  • control unit 7 which controls the noise cancellation.
  • the control unit 7 regulates on the one hand a complex resistor 6, which rests on the loudspeaker 5, and on the other hand a current I (t), which is applied to the loudspeaker rather 5 via an electrical connection 12.
  • I (t) a current which is applied to the loudspeaker rather 5 via an electrical connection 12.
  • the control unit 7 is supplied via an ECU unit 8 with vehicle data, such as in particular the engine speed RPM. Furthermore, the control unit 7 is supplied with a temperature value T c , which is measured by a first temperature sensor 10, and a temperature value T N , which is measured by a second temperature sensor 11.
  • the first temperature sensor 10 is mounted in the region of the Helmholtz chamber 13 in order to measure the exhaust gas temperature in the Helmholtz chamber 13.
  • the second temperature sensor 11 is mounted in the region of the neck 3 in order to measure the exhaust gas temperature in the neck 3.
  • the main control loop 7a shown in FIG. 2a is used. Based on the rotational speed RPM is determined according to the illustrated equation ⁇ as the angular frequency of the ignition order.
  • the engine order N which is significantly dependent on the number of cylinders and the engine timing, but also of Kurbelwellenkröpfung and the architecture of the manifold.
  • N 2, 4, 6, 8, 10, and 12.
  • the most important engine orders 2.5, 5, 7.5 and 10.
  • Combinations in particular, can be used for cylinder deactivation.
  • this main control loop two further control loops are used, the Z-control loop 7b and the I-control loop 7c.
  • the temperature values T c, T N and the angular frequency of the firing order to be detected ⁇ in the Z control loop 7b are subsequently calculated.
  • the complex resistor 6 is set to the calculated value Z L. The control is carried out continuously with a frequency of 10 Hz to 00 Hz.
  • the I-control loop 7c comprises the following steps to optimize the desired anti-noise. First, the voltage generated by the residual noise by the movement of the membrane current voltage U M (t) is measured on the speaker 5.
  • the voltage Uivi (t), a voltage ⁇ ⁇ ( ⁇ ) is determined as part of a signal analysis by means of a fast Fourier transformation FFT.
  • the FFT supplies a voltage spectrum of, for example, 1024 values U (u>). From this voltage spectrum, the voltage values U (u>) are selected for the relevant angular frequencies of the ignition order.
  • the signal analysis can be done in a separate control module 7.1. The signal analysis can also be part of the control module 7.2 for l (t).
  • the resulting actual voltage U M + i (t) is repeatedly determined, and thereafter a difference value ⁇ of the amounts of the two voltages, hence the amount of the difference between U M + i (t) and U M (t ). If the difference value ⁇ is less than 1 or less than 0, 1 or less than 0.001, the iteration loop is not repeated. Otherwise, this iteration loop is repeated.
  • the I-control loop 7c operates at a repetition frequency of 100 Hz to 1000 Hz. If the difference value e is greater than the defined threshold value, 201
  • the iteration loop is repeated.
  • the defined threshold value is preferably reached for the difference value ⁇ and the iteration loop is ended before a recalculation of the angular frequency ⁇ of the ignition order and the impedance Z L takes place in the context of the main control loop 7a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un système de réduction de bruit de véhicule automobile (1) comprenant un résonateur de Helmholtz (2) pourvu d'une chambre de Helmholtz (13), un col (3) et une ouverture de raccordement (4), un haut-parleur (5) placé dans le résonateur de Helmholtz, une résistance complexe variable (6) connectée électriquement au haut-parleur, une unité de régulation (7) destinée à modifier la résistance complexe variable (6) et comprenant une unité de calcul (8) faisant partie de la commande de moteur pour fournir au moins une vitesse de rotation comme paramètre de moteur. Le résonateur de Helmholtz peut être raccordé par le biais du col à un conduit d'admission ou de gaz d'échappement (9) d'un moteur à combustion interne. Le haut-parleur (5 ) limite partiellement le volume du résonateur de Helmholtz (2). Afin d'obtenir une valeur d'impédance acoustique au niveau de l'ouverture de raccordement, une valeur Z2 de l'impédance acoustique immédiatement avant le haut-parleur (5) est tout d'abord déterminée selon la formule (I) et, pour Z 1=0, une valeur cible Z 20 pour Z 2 est déterminée selon la formule (II) puis la résistance complexe (6) est réglée à une impédance électrique artificielle ZL, qui est déterminée selon la formule (III) de sorte que le bruit au niveau de l'ouverture de raccordement peut être au moins partiellement supprimé.
PCT/EP2018/066654 2017-07-07 2018-06-21 Système de réduction de bruit WO2019007700A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017115287 2017-07-07
DE102017115287.3 2017-07-07

Publications (1)

Publication Number Publication Date
WO2019007700A1 true WO2019007700A1 (fr) 2019-01-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112944095A (zh) * 2021-02-22 2021-06-11 南京亿准纳自动化控制技术有限公司 具有消音装置的模块化气体放空立管
CN116085572A (zh) * 2021-01-14 2023-05-09 哈尔滨工程大学 一种基于电声耦合的管道低频噪声控制装置
CN117514419A (zh) * 2024-01-04 2024-02-06 南昌大学 一种发动机排气噪声的控制方法及系统

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226885A1 (de) 1992-08-13 1994-02-17 Bayerische Motoren Werke Ag Schallabsorptionsverfahren für Kraftfahrzeuge
JPH0783729A (ja) * 1993-09-17 1995-03-31 Nissan Motor Co Ltd 容積計
GB2316829A (en) * 1996-08-30 1998-03-04 Nokia Mobile Phones Ltd A telephone handset with a noise-cancelling microphone mounted in a connector
WO1998022700A2 (fr) 1996-11-18 1998-05-28 Leistritz Ag & Co. Abgastechnik Amortisseur actif de bruit
EP1085201B1 (fr) 1999-09-16 2003-11-19 Siemens VDO Automotive Inc. Résonateur Helmholtz actif, ajusté et à réponse forcée
WO2006048557A1 (fr) 2004-11-04 2006-05-11 Faurecia Systemes D'echappement Resonateur de helmholtz et ligne d'echappement le comportant
EP2384023A1 (fr) 2010-04-28 2011-11-02 Nxp B.V. Utilisation de haut-parleur en tant que capteur de vibrations
WO2014053994A1 (fr) 2012-10-01 2014-04-10 Ecole Polytechnique Federale De Lausanne (Epfl) Baffle electroacoustique
DE102013112409A1 (de) 2013-11-12 2015-05-28 Eberspächer Exhaust Technology GmbH & Co. KG Aktive erzeugung und/oder beeinflussung von fahrzeuggeräuschen
US20150303884A1 (en) 2014-04-16 2015-10-22 Yamaha Corporation Driving Apparatus

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226885A1 (de) 1992-08-13 1994-02-17 Bayerische Motoren Werke Ag Schallabsorptionsverfahren für Kraftfahrzeuge
JPH0783729A (ja) * 1993-09-17 1995-03-31 Nissan Motor Co Ltd 容積計
GB2316829A (en) * 1996-08-30 1998-03-04 Nokia Mobile Phones Ltd A telephone handset with a noise-cancelling microphone mounted in a connector
WO1998022700A2 (fr) 1996-11-18 1998-05-28 Leistritz Ag & Co. Abgastechnik Amortisseur actif de bruit
EP1085201B1 (fr) 1999-09-16 2003-11-19 Siemens VDO Automotive Inc. Résonateur Helmholtz actif, ajusté et à réponse forcée
WO2006048557A1 (fr) 2004-11-04 2006-05-11 Faurecia Systemes D'echappement Resonateur de helmholtz et ligne d'echappement le comportant
EP2384023A1 (fr) 2010-04-28 2011-11-02 Nxp B.V. Utilisation de haut-parleur en tant que capteur de vibrations
WO2014053994A1 (fr) 2012-10-01 2014-04-10 Ecole Polytechnique Federale De Lausanne (Epfl) Baffle electroacoustique
DE102013112409A1 (de) 2013-11-12 2015-05-28 Eberspächer Exhaust Technology GmbH & Co. KG Aktive erzeugung und/oder beeinflussung von fahrzeuggeräuschen
US20150303884A1 (en) 2014-04-16 2015-10-22 Yamaha Corporation Driving Apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116085572A (zh) * 2021-01-14 2023-05-09 哈尔滨工程大学 一种基于电声耦合的管道低频噪声控制装置
CN112944095A (zh) * 2021-02-22 2021-06-11 南京亿准纳自动化控制技术有限公司 具有消音装置的模块化气体放空立管
CN112944095B (zh) * 2021-02-22 2022-07-08 南京亿准纳自动化控制技术有限公司 具有消音装置的模块化气体放空立管
CN117514419A (zh) * 2024-01-04 2024-02-06 南昌大学 一种发动机排气噪声的控制方法及系统
CN117514419B (zh) * 2024-01-04 2024-03-22 南昌大学 一种发动机排气噪声的控制方法及系统

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