WO2000036590A1 - A method of and a device for actively reducing the level of a primary field of sound or vibration in a space - Google Patents
A method of and a device for actively reducing the level of a primary field of sound or vibration in a space Download PDFInfo
- Publication number
- WO2000036590A1 WO2000036590A1 PCT/SE1999/002218 SE9902218W WO0036590A1 WO 2000036590 A1 WO2000036590 A1 WO 2000036590A1 SE 9902218 W SE9902218 W SE 9902218W WO 0036590 A1 WO0036590 A1 WO 0036590A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- level
- sensors
- control
- matrix
- parameter
- Prior art date
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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
-
- 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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
-
- 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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
-
- 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
- G10K2210/10—Applications
- G10K2210/106—Boxes, i.e. active box covering a noise source; Enclosures
-
- 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
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1281—Aircraft, e.g. spacecraft, airplane or helicopter
-
- 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
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
-
- 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
- G10K2210/301—Computational
- G10K2210/3023—Estimation of noise, e.g. on error signals
- G10K2210/30232—Transfer functions, e.g. impulse response
-
- 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
- G10K2210/301—Computational
- G10K2210/3055—Transfer function of the acoustic system
-
- 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
- G10K2210/3221—Headrests, seats or the like, for personal ANC systems
Definitions
- the present invention refers to a method of actively reducing the level of a primary field of sound or vibration in a space, comprising the steps of: providing a first number of actuators in the space to produce a secondary field of sound or vibration, which is adapted to interfere with the primary field; providing a second number of control sensors in the space to sense a parameter related to the residual level of the primary field and the secondary field; and determining a first transfer matrix defining for each control sensor the level of the parameter caused by a certain level of the excitation from each actuator.
- the present invention refers to a device for actively reducing the level of a primary field of sound or vibration in a space, comprising a first number of control sensors provided in the space to sense a parameter related to the residual level of the primary field and the secondary field; a second number of actuators provided in the space to produce a secondary field of sound or vibration, which is adapted to interfere with the primary field; and a first determining means provided to determine a first transfer function matrix defining for each control sensor the level of the parameter caused by a certain level of the excitation from each actuator.
- Such a known noise reduction method is effective to reduce the noise at the location of the control sensors, whereas the noise level in the space at positions removed from the control sensors is not directly controllable by the method.
- the noise level at positions removed from the control sensors may be significant, and at certain locations the secondary field may, instead of reducing the primary field, interfere in such a way that the total level of the combined fields is higher than the level of the primary field alone.
- US-A-5 381 485 discloses a device for actively reducing the sound or noise level m a specific region of a space.
- the device of this document comprises a loudspeaker which is intended to generate sound waves to interfere with unwanted sound waves and thereby produce a region having a substantially reduced sound level.
- a control icropnone located closer to the loudspeaker than the region, is provided to sense the sound in the space.
- a loudspeaker control means has an input connected to the control microphone and an output connected to the loudspeaker for operating the latter.
- the loudspeaker control means comprises a signal processing means arranged to simulate a virtual microphone signal that would have been obtained if tne microphone were to be positioned in sa d region, i.e.
- the simulated signal is used to control the loudspeaker.
- the technique presented in this document n reality merely appears to be applicable to one microphone and one loudspeaker.
- the known solution may only be employed when the control microphone and the virtual microphone are located at a relatively small distance from each other in relation to the acoustic wave length, i.e. significantly shorter than the acoustic wave length.
- the object of the present invention is to provide an improved reduction of the noise and/or vibration level in a space.
- it is aimed at a reduction of the noise and/or vibration level at an arbitrary position in a space .
- This object is obtained by the method initially defined and cnaracte ⁇ zed by providing, during an initial, provisional period of time, a third number of monitor sensors in the space to sense the parameter related to the level of the primary field, determining a second transfer matrix defining for each monitor sensor the level of the parameter caused by a certain level from each actuator, and controlling the actuators by means of a force vector being a function of the first transfer matrix, a first projection matrix reflecting tne relation between the first transfer matrix and said second transfer matrix, a second projection matrix reflecting the relations between the parameter sensed by the control sensors and the parameter sensed by sa d monitor sensors, and a residual vector of the actual level of the parameter at the control sensors .
- said monitor sensors are provided at a respective position at which a significant reduction of the level of the primary field is desired.
- the control sensors may be provided at a distance from the positions of said monitor sensors .
- said force vector is advantageously produced by a multiplication of the pseudo inverse of the first transfer matrix, said first projection matrix, the pseudo inverse of said second projection matrix, and said residual vector. Consequently, an effective control function for controlling the forces to be applied to the actuators may be achieved by simple matrix multiplication, which may be performed by conventional computer means.
- the number of control sensors is reduced in the first projection matrix and the second projection matrix to include only an optimal set of sensors for projecting each monitor sensor. In such a manner, it is possible to improve the projection of the control sensors to the monitor sensors by using only the most significant control sensors.
- the object is also obtained by the device initially defined and characterized by a third number of monitor sensors arranged to be provided in the space during an initial, provisional period of time to sense the parameter related to the level of the primary field, second determining means provided to determine a second transfer matrix defining for each monitor sensor the level of the parameter caused by a certain level of the excitation from each actuator, and a control unit provided to control the actuators by means of a force vector being a function of the first transfer matrix, a first projection matrix reflecting the relation between the first transfer matrix and said second transfer matrix, a second projection matrix reflecting the relations between the parameter sensed by the control sensors and the parameter sensed by said monitor sensors, and a residual vector of the actual level of the parameter at the control sensors.
- Fig 1 shows a schematic cross-sectional view of an aircraft cabin having a device according to the invention for reducing the noise level.
- Fig 1 discloses a cross-section through an aircraft body 1, comprising an inner space in the form of a conventional passenger cabin 2.
- the passenger cabin 2 is delimited by an inner wall 3 and a floor 4.
- a plurality of seat rows merely one of which is disclosed in Fig 1.
- Each seat row comprises four seats 5.
- a primary field of sound or noise in the passenger cabin 2 is produced by the operation of the aircraft .
- a device is provided in the passenger cabin 2 in order to reduce the level of the primary field.
- the device comprises a number of actuators 6 which are distributed along the inner wall 3 and the floor 4.
- the actuators 6 are realized as loudspeakers arranged to produce a secondary field of sound.
- the secondary field is adapted to interfere with said primary field.
- the device comprises a number of control sensors 7 which are distributed along the inner wall 3 and the floor 4.
- the control sensors 7 are realized as microphones arranged to sense the residual level of the pressure caused by the primary field and the secondary field.
- Each actuator 6 and each control sensor 7 is connected via a conduit 8 and 9, respectively, to a control unit 10.
- the control unit 10 may comprise an input member 11, provided to receive signals from the control sensors 7 and to convert the signals to a suitable digital form; a computerized processing member 12, provided to process said converted signals; and an output member 13, provided to convert the processed signals to a suitable form and to transmit these signals to a respective actuator 6.
- said control unit 10 comprises a memory member 14 including a memory of the type RAM and connected to the processing member 12.
- a number of monitor sensors 16, in the form of monitor microphones, is arranged m the regions 15 during an initial preparing period before the device is employed for noise reduction. It is to be noted that the monitor sensors 16 may be removed from the passenger cabin 2 after the performance of such measurements and during operation of the device.
- the provisionally provided monitor sensors 16 are also connected to the control unit 10 during said preparing period and arranged to sense the pressure level caused by a certain force applied to the actuators 6. During this preparing or measurement period the level of the primary field is essentially equal to zero.
- control sensors 7, actuators 6 and monitor sensors 16 may vary depending on the actual conditions, for instance the size and the complexity of the passenger cabin 2. Although not a requirement, m the embodiment disclosed the number of control sensors 7 is higher than the number of actuators 6. According to an example, the number of actuators 6 may be 36, the number of control sensors 7 may be 72, and the number of monitor sensors 16 may be 70.
- I is an index indicating the time step m the update of the equation in the controller
- E c is a residual vector of the actual level of the (b) pressure at each control sensor 7
- H c is a first matrix defining the transfer function (c) from each actuator 6 to each control sensor 7,
- H c + is an pseudo inverse of the first transfer (e) function matrix H c .
- control function (a) in the embodiment disclosed, is realized by the LMS-algorithm (Least Mean Square) .
- LMS-algorithm Least Mean Square
- other types of the LMS-algorithms may be employed, for instance a so called leaky LMS-algorithm.
- RLS-algorithm Recursive Least Square
- H m is a second matrix defining the transfer function (g) from each actuator 6 to each monitor sensor 16,
- H m + is the pseudo inverse of the second transfer (h) function matrix H m .
- E m is a residual vector of the actual level of (i) the pressure at each monitor sensor 16.
- the monitor sensors 16 are not employed during flight and therefore the matrix H m is determined in advance by means of the processing member 12 of the control unit 10 during the above-identified preparing period and is stored in the memory member 14.
- a projection matrix P H may be set up as
- P H is a first projection matrix reflecting the relation between the transfer matrix H c and the transfer matrix H m .
- a projection matrix Pu may be set up where
- Pu is a second projection matrix reflecting the (k) relation between the pressure level at each control sensor 7 and the pressure level at each monitor sensor 16 due to the primary field
- U c is a vector of the actual level of the pressure (1) at each control sensor 7 due to the primary field
- U m is a vector of the actual level of the pressure (m) actual level of the pressure at each monitor sensor 16 due to the primary field.
- the residual force may hence be defined by the control function
- Pu + is the pseudo inverse of the second projection matrix u. Also P H and Pu + may be calculated by the processing member 12 and stored in the memory member 1 .
- the noise reduction according to the control function (n) takes into account the fact that the control sensors 7 are not located in the regions 15 where a maximum noise reduction is desired.
- the device according to the invention permits a large number of control sensors and monitor sensors 16 to be utilized, and thus it is possible to effectively reduce the noise at an arbitrary location within the space 2 defined.
- the determination of the first projection matrix (j) for the control function (n) is an error minimization of the predicted response compared to the actual response of the monitor sensors 16.
- the first projection matrix P H as defined takes into account all control sensors 7.
- an optimal set of control sensors 7 is obtained for projecting each monitor sensor 16. Thereby, it is possible to reduce the number of control sensors 7 to include only the best control sensors 7 in the control function (n) .
- the full set of control sensors 7 in the second projection matrix Pu is reduced to include only the most significant control sensors 7 in the pseudo inverse of the first projection matrix P H for a given monitor sensor 16.
- the selected control sensors are used in (k) and an iterative process is used to populate the second projection matrix Pu.
- control function (n) is continuously updated according to an appropriate iteration algorithm, at least with regard to the residual vector E c and potentially with regard to the transfer matrix H c . This means that an actual level of the force vector F is continuously calculated and applied to the actuators 6.
- control function (n) described above is defined for calculations in a frequency plane, which means that a control function (n) is utilized for each frequency to be reduced. It is to be noted that the invention may also be applied to a control function in a time plane. In an example for noise reduction in an aircraft, it is considered appropriate to reduce three different frequencies or frequency intervals.
- control sensors 7 may be arranged to sense a vibration
- actuators may comprise shakers.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99963776A EP1147512A1 (en) | 1998-12-14 | 1999-11-29 | A method of and a device for actively reducing the level of a primary field of sound or vibration in a space |
AU20147/00A AU2014700A (en) | 1998-12-14 | 1999-11-29 | A method of and a device for actively reducing the level of a primary field of sound or vibration in a space |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9804311-0 | 1998-12-14 | ||
SE9804311A SE513754C2 (en) | 1998-12-14 | 1998-12-14 | Method and apparatus for actively reducing the level of a primary field of sound or vibration in a space |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000036590A1 true WO2000036590A1 (en) | 2000-06-22 |
Family
ID=20413645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/002218 WO2000036590A1 (en) | 1998-12-14 | 1999-11-29 | A method of and a device for actively reducing the level of a primary field of sound or vibration in a space |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1147512A1 (en) |
AU (1) | AU2014700A (en) |
SE (1) | SE513754C2 (en) |
WO (1) | WO2000036590A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009007387A1 (en) * | 2007-07-10 | 2009-01-15 | European Aeronautic Defence And Space Compagny Eads France | Aeroplane with improved acoustic comfort |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5245552A (en) * | 1990-10-31 | 1993-09-14 | The Boeing Company | Method and apparatus for actively reducing multiple-source repetitive vibrations |
EP0568282A2 (en) * | 1992-04-28 | 1993-11-03 | Westinghouse Electric Corporation | Noise control system |
US5426703A (en) * | 1991-06-28 | 1995-06-20 | Nissan Motor Co., Ltd. | Active noise eliminating system |
WO1998006089A1 (en) * | 1996-08-07 | 1998-02-12 | Lord Corporation | ACTIVE STRUCTURAL CONTROL SYSTEM AND METHOD INCLUDING ACTIVE VIBRATION ABSORBERS (AVAs) |
-
1998
- 1998-12-14 SE SE9804311A patent/SE513754C2/en not_active IP Right Cessation
-
1999
- 1999-11-29 EP EP99963776A patent/EP1147512A1/en not_active Withdrawn
- 1999-11-29 WO PCT/SE1999/002218 patent/WO2000036590A1/en not_active Application Discontinuation
- 1999-11-29 AU AU20147/00A patent/AU2014700A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5245552A (en) * | 1990-10-31 | 1993-09-14 | The Boeing Company | Method and apparatus for actively reducing multiple-source repetitive vibrations |
US5426703A (en) * | 1991-06-28 | 1995-06-20 | Nissan Motor Co., Ltd. | Active noise eliminating system |
EP0568282A2 (en) * | 1992-04-28 | 1993-11-03 | Westinghouse Electric Corporation | Noise control system |
WO1998006089A1 (en) * | 1996-08-07 | 1998-02-12 | Lord Corporation | ACTIVE STRUCTURAL CONTROL SYSTEM AND METHOD INCLUDING ACTIVE VIBRATION ABSORBERS (AVAs) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009007387A1 (en) * | 2007-07-10 | 2009-01-15 | European Aeronautic Defence And Space Compagny Eads France | Aeroplane with improved acoustic comfort |
FR2918636A1 (en) * | 2007-07-10 | 2009-01-16 | Eads Europ Aeronautic Defence | AIRCRAFT WITH IMPROVED ACOUSTIC COMFORT |
US8376262B2 (en) | 2007-07-10 | 2013-02-19 | European Aeronautic Defence And Space Company Eads France | Aeroplane with improved acoustic comfort |
Also Published As
Publication number | Publication date |
---|---|
AU2014700A (en) | 2000-07-03 |
SE9804311L (en) | 2000-06-15 |
EP1147512A1 (en) | 2001-10-24 |
SE9804311D0 (en) | 1998-12-14 |
SE513754C2 (en) | 2000-10-30 |
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