EP0555266B1 - Active vibration control system - Google Patents
Active vibration control system Download PDFInfo
- Publication number
- EP0555266B1 EP0555266B1 EP91918376A EP91918376A EP0555266B1 EP 0555266 B1 EP0555266 B1 EP 0555266B1 EP 91918376 A EP91918376 A EP 91918376A EP 91918376 A EP91918376 A EP 91918376A EP 0555266 B1 EP0555266 B1 EP 0555266B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- region
- signals
- vibration
- controller
- transfer function
- 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 - Lifetime
Links
Images
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
- G10K11/1781—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
- G10K11/17817—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 between the output signals and the error signals, i.e. secondary path
-
- 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
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- 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
- 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
- G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
-
- 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
- G10K2210/3045—Multiple acoustic inputs, single acoustic output
-
- 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
- G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
-
- 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
- G10K2210/3212—Actuator details, e.g. composition or microstructure
-
- 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
- G10K2210/3216—Cancellation means disposed in the vicinity of the source
Definitions
- the invention relates to active control systems for vibration which reduce vibration in a region where it is undesirable or impossible to mount residual sensors in order to monitor the reduced level of vibration.
- vibration when used in this document, should be taken to include sound and other small amplitude linear disturbances.
- the transfer function of the feedforward controller (sometimes referred to as the transfer characteristic, or frequency response, or impulse response), which relates the output signal of the controller to its input signal, was adjusted during a set-up phase and then left fixed. Since Lueg there were similar systems described which accomplished the same task but used more modern technology.
- Lawson-Tancred (GB1492963) described a system for a duct but he also began to recognize that the input sensor would also respond to the cancelling field (secondary field) generated by the loudspeaker (or actuator). This made the controller more difficult to set-up as the degree of attenuation was potentially very sensitive to small changes in the feedforward transfer function. Consequently, small changes in the acoustics of the system being controlled (here a duct) or changes in the feedforward transfer function of the controller due to the 'drift' in analogue components resulted in poor sound reduction performance.
- One feature of his invention was to incorporate a passive attenuator between the loudspeaker and the input sensor.
- Swinbanks made further improvements by using an input sensor which only responded to and an actuator which only generated sound in one direction, thus acoustically decoupling the input sensor and the actuator.
- Chaplin (GB1555760) recognized that this 'acoustic feedback' could be dealt with by electronic subtraction once digital technology was available with its more constant characteristic. This move to digital technology and the use of signal subtraction was a key aspect in the development of the technology.
- One key aspect of that invention was the recognition of the fact that the feedforward transfer function was at its optimum when the correlation between the input sensor and the residual sensor was at a minimum.
- the automatic procedure minimized the correlation, and thus described a self-calibrating system which could be used to reduce the sound in a region around the residual sensor.
- a system of this type is used in a duct, for example, because the primary field is propagating in one direction the region where quiet is produced is everywhere downstream of the actuator, and the residual sensor is at a point which represents the acoustic excitation in that whole region due to waves emanating upstream in the duct.
- the residual sensor is in the region and the controller is functioning by minimizing the sound at the residual sensor.
- Chaplin (PCT/GB82/00299 or GB2107960) described the workings of a controller which was for controlling 'periodic' sounds made by rotating or repetitive sources.
- This controller used a tachometer as an input sensor.
- An input sensor of this type is only responsive to the phase of the (primary) vibration field as it is not responsive to the amplitude of the vibration.
- the system required sensors (microphones or accelerometers) in the region where quiet was required, and the operation of the system was to minimize the residual sensor signal's correlation with the input sensor signal.
- Nelson and Elliott (GB2149614) described a system of this type in which a few algorithms are used to reduce the sound in a cabin. The system minimizes the sum of the squares of the amplitude of the residual sensor signals.
- a system for controlling the vibration in a helicopter structure generally is described by King (US4819182 and GB2160840) which uses multiple (12) residual sensors, however, the system again envisages that by reducing the vibration at the accelerometers the vibration of the whole structure will be reduced, but it does not describe a way of achieving this.
- PCT/GB89/00964 An earlier patent application by the current inventors (PCT/GB89/00964) discusses the provision of an active control system inside a cabin which achieves attenuation of the sound at passengers' head positions.
- U.S. Patent No. 4,689,821 discloses a system in which one or more input sensors generate first signals related to the phase or amplitude of a primary vibration field produced by a propeller/turbofan, an actuator produces a secondary vibration field, monitoring sensors positioned in a first region produce third signals responsively to excitation by the primary and secondary vibration fields, and a controller including a feedforward path which responds to the first signals to produce second signals for reducing vibration in a second region excited by the primary and secondary vibration fields tends to be reduced.
- the controller adapts the transfer function of the feedforward path with reference to the first and third signals, but no account is taken of relationships between vibration fields as between the first and second regions or between these fields and the output of the controller.
- an active vibration control system comprises:
- the relationship is preferably determined, at least in part, from a measured relationship between the third signals and fourth signals obtained from calibration sensors positioned in the second region only during calibration.
- controller's transfer function adaptation may also make use of the relationship between the secondary vibration fields in the first region and the controller output.
- the controller's transfer function adaptation may also make use of the relationship between the secondary vibration field in the second region and the controller output.
- controller's transfer function adaptation may also make use of the relationship between the secondary vibration field in the first and second regions.
- controller's transfer function adaptation may be made so as to minimize the weighted sum of products of calculated signals which represent the expected vibration in the second region.
- the controller's transfer function adaptation may be made so as to minimize the weighted sum of products of calculated signals which represent the expected vibration in the second region and the weighted sum of products of the transfer function elements.
- the controller's transfer function adaptation may be made so as to minimize the weighted sum of products of the third signals where the weighted sum is chosen so that the vibration in the second region is reduced.
- the controller may be calibrated using calibration sensors positioned in the second region which produce the said fourth signals representative of the vibration in the said second region.
- the first region may be close to and/or bounded by the surface of a cabin interior to be occupied by at least one person, the second region being that region within the said cabin interior which will normally be occupied by the person's head.
- the actuators may be positioned close to or on the interior surface of the said cabin interior, or the actuators may be incorporated in the structure surrounding the said cabin.
- the primary vibration field will be that produced by the engine or tyres of the vehicle, the cabin interior being the passenger compartment of the vehicle and the actuators being incorporated in the engine or suspension mounting systems of the vehicle.
- the first region may be close to and/or bounded by the surface of a body and the second region may be the surrounding space, and the actuators may be positioned on or close to the surface of the said body, or incorporated into the structure of the body.
- the first and second regions may partly overlap.
- the residual sensors, 8, are positioned in the region where quiet is desired, 9.
- the input sensor, 2, is a single tachometer.
- the actuators, 1, are loudspeakers.
- the feedforward part of the controller, 7, has its transfer function adjusted in response to the signals from the residual sensor signals.
- the present invention provides an active vibration control system which reduces the vibration in a (second) region without the need to position residual sensors in that region.
- the invention does require sensors (monitoring sensors) but these can be outside the second region, where the vibration is to be reduced.
- these monitoring sensors are not required to be in the second region they are described as being in a first region.
- the vibration at the monitoring sensors ie in the first region
- the third signals are used, in conjunction with the first (input sensor) signals, to adapt the transfer function of the feedforward part of the controller in order to maintain the attenuation in the second region.
- this operation can be thought of as calculating the amplitude of the vibration in the second region from the values of the third signals and the first signals and adjusting the feedforward transfer function to minimize this calculated value.
- the present invention differs from previously disclosed systems in that the additional sensors (in this case called monitoring sensors to distinguish them from the 'residual' sensors of previous systems) are not necessarily in the quiet region and thus the adaption of the feedforward transfer function of the controller of the present invention does not minimize the sum of the squares of the amplitude of these additional sensor signals.
- the additional sensors in this case called monitoring sensors to distinguish them from the 'residual' sensors of previous systems
- the active vibration control system has actuators, 1, driven by second signals which produce a secondary vibration field, input sensors, 2, which generate first signals related to the phase and/or amplitude of the primary vibration field, monitoring sensors, 3, positioned in a first region, 4, which produce third signals, and a controller, 5, which generates the second signals in response to the first and third signals.
- the primary and secondary fields meet in a second region, 6, and the transfer function of the part of the controller between the first signals and the second signals (the feedforward path), 7, is adjusted in response to the first and third signals in order to maintain a reduction in the vibration in the second region.
- calibration sensors are mounted in the second region in order to give information about the acoustics of the system under control and the statistics of the signals. These calibration sensors produce fourth signals. The calibration sensors can be removed after the calibration proceedure has been finished.
- the signals from the input sensors are represented by u (where u is a vector of i complex numbers for a single frequency, with each element corresponding to one of the i first signals).
- the n second signals (which are used to drive the n actuators) are represented by an n-long vector x .
- the third signals (from the monitoring sensors) due to the primary field alone are represented by an r-long vector Y m , and P m when the primary and secondary fields are present.
- the fourth signals (from the calibration sensors) due to the primary field alone are represented by a t-long vector Y c , and P c when the primary and secondary fields are present.
- the transfer function of that part of the controller between the first and second signals is represented by a complex matrix Q (which has n rows corresponding to the n second signals, and i columns corresponding to the i first signals).
- Q Q u .
- the transfer function relating the second signals to the third signals is represented by the complex matrix A (which has r rows and n columns) and the transfer function relating the second signals to the fourth signals is represented by the complex matrix D (which has t rows and n columns).
- P c Y c + DQ u
- P m Y m + AQ u .
- the active vibration control system operates by calculating the expected value of the fourth signals from the third signals and the first signals and adjusts the feedforward transfer function to minimize the weighted sum of the squares of these calculated signals.
- C is a complex matrix with t rows and r columns which is chosen to minimize the norm of e , and ⁇ .. ⁇ is the expectation operator.
- the controller's feedforward transfer function can be set equal to the value given in equation (6) or (7).
- the vibrational characteristics may have changed and it will be desirable to adapt the controller's feedforward transfer function in order to compensate for the changes. This now requires the calculated value of the fourth signal to be used as the calibration sensors are no longer available.
- the transfer function D represents the signal path from the second signals, through the actuators, through the vibration bearing medium, to the second region.
- the system operates to minimise the sound in the second region by minimising a weighted sum of products of the third signals, the weights being selected so that the vibration in the second region is minimised.
- An alternative method of finding C would extend the range of primary vibration fields measured during the third part of the calibration by using additional sources, driven by additional test signals, and close to the positions of the real sources. This would ensure that the system would continue to minimise the weighted sum of products of the expected fourth signals for all classes of expected primary fields and those created by the additional test signals which would be chosen to represent likely departures of the primary field from its normal state.
- the subject invention is particularly useful for controlling sound in a cabin or passenger compartment of a passenger vehicle.
- the monitoring sensors could be placed in or close to the trim of the cabin walls, or in or close to the seats and the second region would be the region in the cabin which would be occupied by the heads of the passengers.
- the actuators for producing the secondary vibration field could be loudspeakers positioned in or close to the trim of the cabin or in or close to the seats.
- the actuators could form part of the structure of the cabin walls. For example, they could be electro or magneto strictive materials attached to the cabin walls which cause the cabin walls to vibrate.
- a further alternative form of actuators could be positioned in or close to the suspension bushings or engine mounts or any other part of the vibration path from a source of sound in a vehicle cabin to the cabin interior.
- the monitoring sensors may be better positioned close to the actuators and not in the trim as first described.
- the invention will also be seen to be useful in controlling the noise radiated from an object when it is difficult or impractical to position residual sensors in the far field. This would be the case in controlling the radiated noise from a transformer casing, a ship, or the tyre of a road vehicle. In any of these cases the monitoring sensors would likely be positioned close enough to the surface of the radiating body to be in the near field of both the actuators and the body itself. Consequently, whilst the primary and secondary fields will combine they will not combine in a way to cancel each other when the cancellation is at its optimum in the far field. The present invention is thus particularly useful in controlling noise from such objects.
Abstract
Description
Claims (19)
- An active vibration control system comprising:one or more input sensors (2) which generate first signals related to the phase and/or the amplitude of a primary vibration field,a plurality of actuators (1) drivenby second signals which produce a secondary vibration field,a plurality of monitoring sensors (3) positioned in a first region (4) where they are excited by the combination of the said primary and secondary vibration fields and which produce third signals,a controller (5) including a feedforward path which is responsive to the said first signals and generates the said second signals so that the vibration in a second region (6), which is excited by the said primary and secondary vibration fields, tends to be reduced,
- A system according to claim 1, in which the relationship is at least in part determined from a measured relationship between the third signals and fourth signals obtained from calibration sensors positioned in the second region (6) only during calibration.
- A system according to claim 1 or claim 2, in which the adaptation of the controller's transfer function also makes use of the relationship between the secondary vibration field in the first region (4) and the output of the controller (5).
- A system according to claim 1 or claim 2 or claim 3, in which the adaptation of the controller's transfer function also makes use of the relationship between the secondary vibration field in the second region (6) and the output of the controller (5).
- A system according to any of claims 1 to 4, in which the adaptation of the controller's transfer function also makes use of the relationship between the secondary vibration field in the first and second regions (4, 6).
- A system according to any of the preceding claims, in which adaptation of the controller's transfer function is made so as to minimize the weighted sum of products of calculated signals which represent the expected vibration in the second region (6).
- A system according to any of claims 1 to 6, in which the adaptation of the controller's transfer function is made so as to minimize the weighted sum of products of calculated signals which represent the expected vibration in the second region (6) and the weighted sum of products of the transfer function elements.
- A system according to any of claims 1 to 6, in which the adaptation of the controller's transfer function is made so as to minimize the weichted sum of products of the third signals where the weighted sum is chosen so that the vibration in the second region (6) is reduced.
- A system according to claim 2 or any claim appendant thereto, in which the controller (5) is calibrated using calibration sensors positioned in the second region (6) which produce the said fourth signals representative of the vibration in the said second region.
- A system according to any of the preceding claims, in which any of the relationships A, B, C or D as hereinbefore defined are stored in the controller (5).
- A system according to any of the preceding claims, in which any of the relationships A, C or D as hereinbefore defined are adjusted in order to take account of changes.
- A system according to any of the preceding claims, in which the first region (4) is close to and/or bounded by the surface of a cabin interior and the second region (6) is that part of the said cabin interior where the occupants' heads tend to be.
- A system according to claim 12, in which the said actuators (1) are positioned close to or on the interior surface of the said cabin interior.
- A system according to claim 12, in which the said actuators (1) are incorporated in the structure surrounding the said cabin.
- A system according to claim 12, in which the primary vibraration field is produced by the engine or tyres of a car, the said cabin interior is in the said car and the said actuators (1) are incorporated in the engine or suspension mounting systems.
- A system according to any of claims 1 to 11, in which the first region (4) is close to and/or bounded by the surface of a body and the second region (6) is the surrounding space.
- A system according to claim 16, in which the said actuators (1) are positioned on or close to the surface of the said body.
- A system according to claim 16, in which the said actuators (1) are incorporated in the structure of the body.
- A system according to any of the preceding claims, in which the first and second regions (4, 6) partly overlap.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909023459A GB9023459D0 (en) | 1990-10-29 | 1990-10-29 | Active vibration control system |
GB9023459 | 1990-10-29 | ||
PCT/GB1991/001849 WO1992008223A1 (en) | 1990-10-29 | 1991-10-22 | Active vibration control system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0555266A1 EP0555266A1 (en) | 1993-08-18 |
EP0555266B1 true EP0555266B1 (en) | 1998-09-02 |
Family
ID=10684492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91918376A Expired - Lifetime EP0555266B1 (en) | 1990-10-29 | 1991-10-22 | Active vibration control system |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0555266B1 (en) |
JP (1) | JPH06502257A (en) |
AT (1) | ATE170654T1 (en) |
AU (1) | AU660423B2 (en) |
CA (1) | CA2095033C (en) |
DE (1) | DE69130112T2 (en) |
DK (1) | DK0555266T3 (en) |
ES (1) | ES2121790T3 (en) |
GB (1) | GB9023459D0 (en) |
WO (1) | WO1992008223A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7983813B2 (en) | 2004-10-29 | 2011-07-19 | Bose Corporation | Active suspending |
US8095268B2 (en) | 2004-10-29 | 2012-01-10 | Bose Corporation | Active suspending |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5381485A (en) * | 1992-08-29 | 1995-01-10 | Adaptive Control Limited | Active sound control systems and sound reproduction systems |
GB9218465D0 (en) * | 1992-08-29 | 1992-10-14 | Adaptive Control Ltd | Active sound control systems and sound reproduction systems |
US5481615A (en) * | 1993-04-01 | 1996-01-02 | Noise Cancellation Technologies, Inc. | Audio reproduction system |
US7962261B2 (en) | 2007-11-12 | 2011-06-14 | Bose Corporation | Vehicle suspension |
DE102008061552A1 (en) * | 2008-12-11 | 2010-07-01 | Areva Energietechnik Gmbh | Method for reducing noise of electrical transformer, involves determining current operating point of transformer and providing measurement protocol for characterizing operating point dependent behavior of transformer |
ES2915268T3 (en) * | 2015-06-06 | 2022-06-21 | Yehuda Oppenheimer | A system and method for the active reduction of a predefined audio acoustic noise through the use of synchronization signals |
JP6917914B2 (en) * | 2018-01-18 | 2021-08-11 | 株式会社奥村組 | Active noise controlled sound field simulation method and simulation device |
JP6917937B2 (en) * | 2018-03-27 | 2021-08-11 | 株式会社奥村組 | Evaluation method and evaluation device for sound field simulation by active noise control |
DE102020116451B4 (en) | 2020-06-23 | 2024-02-08 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Device and method for active noise suppression in a vehicle |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4689821A (en) * | 1985-09-23 | 1987-08-25 | Lockheed Corporation | Active noise control system |
GB8610744D0 (en) * | 1986-05-01 | 1986-06-04 | Plessey Co Plc | Adaptive disturbance suppression |
JP2890196B2 (en) * | 1986-10-07 | 1999-05-10 | アダプティブ コントロール リミテッド | Active vibration control device or related improvements |
-
1990
- 1990-10-29 GB GB909023459A patent/GB9023459D0/en active Pending
-
1991
- 1991-10-22 AU AU87393/91A patent/AU660423B2/en not_active Ceased
- 1991-10-22 DK DK91918376T patent/DK0555266T3/en active
- 1991-10-22 JP JP3516923A patent/JPH06502257A/en active Pending
- 1991-10-22 WO PCT/GB1991/001849 patent/WO1992008223A1/en active IP Right Grant
- 1991-10-22 EP EP91918376A patent/EP0555266B1/en not_active Expired - Lifetime
- 1991-10-22 ES ES91918376T patent/ES2121790T3/en not_active Expired - Lifetime
- 1991-10-22 CA CA002095033A patent/CA2095033C/en not_active Expired - Fee Related
- 1991-10-22 AT AT91918376T patent/ATE170654T1/en not_active IP Right Cessation
- 1991-10-22 DE DE69130112T patent/DE69130112T2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7983813B2 (en) | 2004-10-29 | 2011-07-19 | Bose Corporation | Active suspending |
US8095268B2 (en) | 2004-10-29 | 2012-01-10 | Bose Corporation | Active suspending |
Also Published As
Publication number | Publication date |
---|---|
EP0555266A1 (en) | 1993-08-18 |
ATE170654T1 (en) | 1998-09-15 |
DE69130112T2 (en) | 1999-03-04 |
WO1992008223A1 (en) | 1992-05-14 |
DK0555266T3 (en) | 1999-05-31 |
JPH06502257A (en) | 1994-03-10 |
ES2121790T3 (en) | 1998-12-16 |
CA2095033A1 (en) | 1992-04-30 |
AU660423B2 (en) | 1995-06-29 |
DE69130112D1 (en) | 1998-10-08 |
AU8739391A (en) | 1992-05-26 |
CA2095033C (en) | 1997-12-30 |
GB9023459D0 (en) | 1990-12-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5337365A (en) | Apparatus for actively reducing noise for interior of enclosed space | |
EP0795169B1 (en) | Frequency-focused actuators for active vibrational energy control systems | |
EP0555266B1 (en) | Active vibration control system | |
EP0724762B1 (en) | Active control system for noise shaping | |
JP3276214B2 (en) | Vehicle vibration reduction device | |
EP3996086B1 (en) | Virtual location noise signal estimation for engine order cancellation | |
JPH0687335A (en) | Vibration reducing device for vehicle | |
Hasegawa et al. | The development of an active noise control system for automobiles | |
KR20200110365A (en) | Active noise control method and system using variable actuator and sensor engagement | |
Elliott | Active control of structure-borne noise | |
JP5040163B2 (en) | Noise reduction apparatus and method | |
Gulyas et al. | Active noise control in agricultural machines | |
JPH03228097A (en) | Vibration controller | |
JPH06138888A (en) | Active vibration controller | |
JPH04342296A (en) | Active type noise controller | |
WO1994029845A1 (en) | Top speaker mounting for active noise cancellation | |
JP3502112B2 (en) | Noise canceling device | |
JP2597565Y2 (en) | Muffler using movable noise canceling speaker | |
KR19990042877A (en) | Method of controlling active noise of automobile | |
JPH09281975A (en) | Vibration noise controller | |
JP3275449B2 (en) | Active noise control device and active vibration control device | |
JPH06250674A (en) | Active noise controller | |
JPH10301579A (en) | Adaptive control system | |
JP3503140B2 (en) | Vehicle vibration control device | |
JPH06266371A (en) | Active noise controller for vehicle |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19930505 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
17Q | First examination report despatched |
Effective date: 19960524 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19980902 |
|
REF | Corresponds to: |
Ref document number: 170654 Country of ref document: AT Date of ref document: 19980915 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 69130112 Country of ref document: DE Date of ref document: 19981008 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19981022 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: PATENTANWALTSBUERO FELDMANN AG |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2121790 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20060915 Year of fee payment: 16 Ref country code: AT Payment date: 20060915 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DK Payment date: 20060919 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20060921 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20061005 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20061020 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20061026 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20061031 Year of fee payment: 16 Ref country code: IT Payment date: 20061031 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20061103 Year of fee payment: 16 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Owner name: NOISE CANCELLATION TECHNOLOGIES, INC. Free format text: NOISE CANCELLATION TECHNOLOGIES, INC.#1015 WEST NURSERY ROAD, SUITE 101#LINTHICUM, MD 21090 (US) -TRANSFER TO- NOISE CANCELLATION TECHNOLOGIES, INC.#1015 WEST NURSERY ROAD, SUITE 101#LINTHICUM, MD 21090 (US) |
|
BERE | Be: lapsed |
Owner name: *NOISE CANCELLATION TECHNOLOGIES INC. Effective date: 20071031 |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: EBP |
|
EUG | Se: european patent has lapsed | ||
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20071022 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20080501 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080501 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071022 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20080630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071023 Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080501 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20061003 Year of fee payment: 16 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071022 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20071023 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071031 Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071023 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071022 |