EP0852793B1 - Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues - Google Patents
Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues Download PDFInfo
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- EP0852793B1 EP0852793B1 EP96932664A EP96932664A EP0852793B1 EP 0852793 B1 EP0852793 B1 EP 0852793B1 EP 96932664 A EP96932664 A EP 96932664A EP 96932664 A EP96932664 A EP 96932664A EP 0852793 B1 EP0852793 B1 EP 0852793B1
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Definitions
- the present invention relates to active attenuation of vibrations, i.e. the operation which consists in attenuating certain vibrations, by superimposing other vibrations created in phase opposition with the vibrations to be attenuated.
- the feedback loop includes an input connected to so-called “close” vibration sensor means, arranged on the framework, and an output connected to actuator means of vibrations placed on the frame, near the means close sensors.
- the signal measured by the sensor means close is directly injected into the actuator means at through filtering means which correct said signal to try to cancel his energy.
- This retroactive technique makes it possible to obtain an attenuation vibration with a certain gain, without causing instability in a processing frequency band.
- this processing band corresponds to low frequencies, for example in sound vibrations at the frequency band ranging from 0 to 600 Hz.
- the anticipation technique is articulated around means adaptive filtering whose coefficients are adapted in real time according to an algorithm chosen so as to minimize the energy of the vibrations captured by the means close sensors according to the energy of the vibrations of reference received by the remote sensor means.
- active feedback depreciation is here performed on a single frequency, which makes this solution inappropriate and ineffective for active treatment on a wide frequency band.
- This active depreciation is in equivalent to passive amortization since it does not than the fundamental frequency of the framework, which is totally different from active broadband control by retroactive filtering.
- this is a simple juxtaposition of early screening and amortization active in which no synergy of techniques is implementation.
- the present invention provides a solution to these problems.
- Another object of the invention is to provide attenuation active type "hybrid" in which filtering by anticipation is grafted onto feedback filtering or conversely, in order to improve the respective behavior said filtering in advance and by feedback with a resulting attenuation greater than the algebraic sum attenuations of said filterings taken separately.
- the framework includes at least one cavity defined by one ear and passive mitigation means, the first means sensors and actuator means being housed in said cavity while the second sensor means being arranged out of the cavity.
- the framework includes a metal beam, a plate, a trellis, seat, ventilation duct or the like.
- the first and second sensor means comprise each at least: a type of sound sensor element microphone, a type acceleration sensor element accelerometer, a displacement sensor element, an element speed sensor, a strain sensor element, a force sensor element or the like.
- the first sensor means comprise two sensor elements, one being associated with the means of filtering in advance, the other being associated with the means filtering by feedback.
- the actuator means comprise a source speaker-type sounds, a test body, a jar vibrating or the like.
- the filtering means by feedback include a plurality of analog filters and / or active numerics of order greater than or equal to 1, arranged for generate a transfer function to avoid instabilities in the first frequency band in the sense of Nyquist, and the transfer function of the filtering means by feedback is determined so that the phase of said transfer function does not go through the value 0 in the first frequency band.
- the feedback filtering means are infinite impulse response type.
- the means of advance filtering are finite impulse response, and the minimization algorithm is of the average least squares type.
- the device comprises a plurality of first sensor means, and means actuators and the device is articulated around a master / slave multiprocessor structure, each processor slave being responsible for controlling a single actuator means.
- the present invention also relates to a method active hybrid attenuation of vibrations, in particular mechanical, sound or similar vibrations used by the device described above.
- the frame likely to be subject to vibrations at attenuate includes a cavity 2 delimited by an ear 4 and attenuation means 6 of the helmet type 6.
- the helmet with retroactive filter is the one sold by the company TECHNOFIRST.
- this helmet is equipped with a mitigation device active acoustic feedback.
- the pre-amplification means 9, the filtering means by feedback 12 and the amplification means 18 constitute here a feedback loop 30 arranged in a known manner to generate active acoustic attenuation without generate instability in a selected frequency band.
- Figure 1 there is shown near the helmet, a noise source 40 liable to generate vibrations sound for experimental and test purposes.
- the frequency band in which the means filtering methods are effective without causing instability in the sense of Nyquist is of the order of 0 to 600 Hz for sound vibrations (figure 3).
- the filtering means by feedback 12 include a plurality of active analog filters of order greater than or equal to 1, arranged to generate a transfer function to avoid instabilities in the frequency band 0-600 Hz in the sense of Nyquist, and the transfer function of the filtering means 12 is determined so that the phase of said function of transfer does not go through the value 0 in the band 0-600 Hz.
- the helmet allows treatment wide band up to 600 Hz and noise attenuations of around 20 dB.
- a pumping effect appears at from 650 Hz which results in an increase in noise level in relation to the action of the mitigation means passive alone.
- This phenomenon is well known from the skilled person, and constitutes a non-linearity (degradations performance) compared to the expected results of observing the open loop system.
- the Applicant has posed the problem of remedying the disadvantages related to feedback filtering.
- the solution according to the invention consists first of all, in use an additional microphone 100 placed at a certain distance from the microphone 8.
- the microphone additional 100 is arranged on the upper part of the means which allow the two shells of the helmet. Under these conditions, the additional microphone 100 is close to the noise source 40 and thus makes it possible to retrieve useful information to be processed.
- this remote microphone can be arranged differently.
- summing means 110 are provided at the level of the feedback loop 30. These summing means 110 have a first input 112 connected to the output 16 of the filtering means 12, a second input 114 and an output 116 connected to input 20 of the means amplifiers 18.
- type filtering means by anticipation are grafted to the feedback loop 30 to improve feedback filtering and, more exactly, in order to linearize the active attenuation in the entire frequency band wider than the 0-600 band Hz and thus improve the active attenuation gain in the widened band which can go up to 3000 Hz (figure 4), by total elimination of the mentioned pumping effect above.
- the means of advance filtering 130 include a first input 132 connected to the microphone additional 100, a second input 134 connected to the microphone 8 and an output 136 connected to the second input 114 of the summing means 110.
- the coefficients filtering the anticipation filtering means 130 are adapted in real time according to an algorithm chosen for minimize the energy of vibrations picked up by the microphone 8, depending on the energy of the vibrations picked up by the microphone 100, in order to linearize the retroactive attenuation in a whole frequency band wider than the band of frequencies processed directly by feedback, speed up convergence of the minimization algorithm, and improve the robustness of the anticipation filtering means.
- the means of advance filtering include type finite impulse response filters adaptive 140.
- the coefficients of the filters 140 are updated in real time by a minimization algorithm 150.
- the minimization algorithm is of the type of mean least squares, also called LMS for "LEAST MEAN SQUARES ".
- the active attenuation of the "hybrid" type obtained according to the invention results from a combination of means of filtering by anticipation and by feedback in which the advance filtering is grafted on the filtering by feedback or vice versa.
- This combination of filtering in advance and by feedback according to the invention improves behavior respective of said filterings, with active attenuation resulting greater than the algebraic sum of the attenuations individual said filterings taken separately.
- the anticipation filtering means 130 comprise a first A8 acquisition module associated with sensor means relatives 8 and a second A100 acquisition module associated with remote sensor means 100.
- the A8 and A100 acquisition modules are generally alike. However, in some configurations, the acquisition modules can be different. Their constituent elements are identified by the suffix 8 when associated with sensor means 8 and 100 when associated with the remote capture means 100.
- Each acquisition module is connected to processing means DSP which will ensure in particular the minimization algorithm described above.
- the digital processing means are of the type PSN digital signal processor.
- DSP processor includes an E8 input for receiving signals leaving the A8 acquisition module and an E100 input receiving signals from the A100 acquisition module.
- DSP processor includes signal output digital for a R rendering module.
- This R rendering module includes a digital / analog converter CNAR and a FLR smoothing filter, for example low pass type, the input of which receives the outgoing signal from the digital / analog converter CNAR and whose output is connected to the second input 114 of the summing means 110.
- a digital / analog converter CNAR and a FLR smoothing filter, for example low pass type, the input of which receives the outgoing signal from the digital / analog converter CNAR and whose output is connected to the second input 114 of the summing means 110.
- the DSP processor is the one sold by the company TEXAS INSTRUMENT under the reference TMS 320C25.
- the means of feedback filtering 12 are put into operation as well that the noise source 40, while the filtering means in advance are put in pause position.
- the preamplifiers are regulated on the means of advance filtering PE8 and PE100, to be in full scale of CAN8 analog / digital converters and CAN100.
- the transfer function is sampled and saved in the memory of the DSP processor.
- the transfer function is sampled at the frequency of 3000 Hz on a number of 80 points.
- the digital processing means acquire periodically, and in real time, the distant noise picked up by remote sensor means 100. They also calculate signal energy, representative of the sum of energies signals delivered by nearby sensor means 8. Then, the anticipation filter means 150 are placed in search of optimal parameters for the best active attenuation. Knowledge of impulse responses previously measured, signals from the means close and remote sensors in real time, allows a minimization algorithm chosen to determine, in time real, the attenuation control signal values active acoustics.
- the purpose of convergence here is to minimize the energy of signals delivered by the microphone 8 placed in the cavity to denoise from the helmet.
- the minimization algorithm uses the technique mean least squares which is most prevalent in real-time applications.
- the minimization algorithm may be a frequency algorithm working on transforms of Fourier of the signals considered.
- control 8 takes account of filtering by feedback here.
- the instability information related to filtering by feedback are introduced in the impulse response of the filter in advance.
- the information broadband active attenuation related to filtering by feedback appear in the sampled items of the impulse response.
- Figures 3 to 10B show the spectral densities of power measured using a fixed microphone in the ear of the experimenter in different configurations. Adverse reactions due to instability of the feedback filtering (rejection up to 8 dB) are eliminated by the action of the advance filtering device (see figures 3, 4 and 5).
- the anticipation device makes it possible to obtain, outside the feed back processing band (o-600 Hz), a gain in attenuation of 2 to 10 dB compared to a passive helmet (figure 6).
- the device described with reference to Figures 1 and 2 uses a single-channel type processing, articulated around the processor TMS 320C25 from TEXAS INSTRUMENT which can execute 10 million instructions per second.
- a multi-channel device comprising a plurality of sensors 8, remote sensors 100 and actuators 10.
- the processor can only work at sampling frequencies less than or equal to 1000 Hz.
- the present invention also provides a solution to these problems.
- the attenuation device is capable of manage a plurality of channels, for example twenty channels analog input capable of receiving signals from 19 close sensors individualized in 8-1 to 8-19 and a remote sensor 100.
- the device according to the invention also includes at least sixteen capable output channels to convey signals to sixteen individualized actuators in 10-1 to 10-16.
- Such a structure implies the processing of I (number error sensor integer 8) times J (integer number of actuators) impulse responses, one RIJ response for each combination of actuators J and error sensors I.
- the device is articulated around a master / slave multiprocessor structure, each processor slave being responsible for controlling a single actuator means.
- the DSPM master processor does the acquisition of all the signals emanating from the sensors 8 and 100, in particular the so-called remote reference signals as well as the so-called error control signals. He distributes them then to all DSPE slave processors, individualized here in DSPE-1 to DSPE-16.
- Each DSPE slave processor calculates the output signal of a single actuator 10.
- the sensors 8 and the remote sensor 100 are connected to the inputs of a BA acquisition block whose output is connected to the DSPM master processor.
- This BA acquisition block includes, like the acquisition modules A described with reference to FIG. 2, a preamplifier element PE, preferably a conditioning filter specific to the chosen application FAT and a converter analog / digital CAN.
- a preamplifier element PE preferably a conditioning filter specific to the chosen application FAT and a converter analog / digital CAN.
- the conditioning filter can be digital (anti-overlap) or analog (specific).
- a laptop type microcomputer can be provided. he is in this case connected to the master processor and is provided with all control software for the entire installation.
- the digital assembly is articulated around a processor element PSN digital signal, for example the one sold by the TEXAS INSTRUMENT under the reference TMS 320C50.
- Each slave processor is dedicated to the control of a single actuator.
- this is the processor associated with the 10-1 actuator and which is in connection with all microphones 8 as well as with the remote microphone 100.
- All signals from sensors 8 and 100 are routed through the BA acquisition block and the DSPM master processor to the DSPE-1 slave processor.
- the DSPE slave processor generally includes the same elements than those of the single-channel device described with reference in Figure 2. Thus, we find the means of restitution R, the feedback filtering means 12 as well as the advance filtering 130.
- a summing element 110 receives signals from both at its two inputs filtering to deliver the attenuation signal on its output to the actuator 10-1.
- the slave processor includes communication with the DSPM master processor.
- pairs of transducers 8 and 10 i.e. the treatment routes on which are applied the respective feedback filtering means.
- each DSPE slave processor calculates, in parallel advance filtering, feedback filtering which associated with it, in the case of filtering by feedback of digital type.
- the structure subject to vibrations can also be a metal beam, a plate, a trellis, a seat, ventilation duct or the like.
- the sensor means can be sensor means of sounds, but also of acceleration, constraint, force, displacement, speed or the like.
- the means actuators can be not just a sound actuator such as a speaker, but also a test body, a piezoelectric element, or the like.
- close sensor means may include two elements sensors, one being associated with the filtering means by anticipation, the other being associated with the filtering means by feedback.
Description
- une ossature susceptible d'être sujette à des vibrations à atténuer;
- des premiers moyens capteurs de vibrations, disposés sur l'ossature selon une première relation géométrique prédéterminée par rapport à ladite ossature;
- des moyens actionneurs de vibrations, disposés sur l'ossature à proximité des premiers moyens capteurs; et
- des moyens de filtrage comprenant au moins une entrée reliée aux premiers moyens capteurs et une sortie reliée aux moyens actionneurs, les moyens de filtrage étant agencés pour engendrer une atténuation active des vibrations sur l'ossature,
- des seconds moyens capteurs de vibrations, disposés sur l'ossature selon une seconde relation géométrique prédéterminée par rapport à ladite ossature;
- des moyens sommateurs possédant une première entrée, une seconde entrée, et une sortie reliée aux moyens actionneurs.
- des moyens de filtrage par rétroaction de type non adaptatif possédant une entrée reliée aux premiers moyens capteurs et une sortie reliée à la première entrée des moyens sommateurs, et propres à engendrer une atténuation active non adaptative des vibrations sur l'ossature, sans engendrer d'instabilité dans une première bande de fréquences;
- des moyens de mesure propres à mesurer, au préalable, en présence des moyens de filtrage par rétroaction, la fonction de transfert entre les moyens actionneurs et les premiers moyens capteurs;
- des moyens de filtrage par anticipation de type adaptatif comprenant une première entrée reliée aux seconds moyens capteurs, une seconde entrée reliée aux premiers moyens capteurs, et une sortie reliée à la seconde entrée des moyens sommateurs;
ce qui permet de linéariser l'atténuation rétroactive dans toute une seconde bande de fréquences plus large que la première bande de fréquences, d'accélérer la convergence de l'algorithme de minimisation, et d'améliorer la robustesse des moyens de filtrage par anticipation.
- la figure 1 est une représentation schématique du dispositif d'atténuation acoustique active selon l'invention;
- la figure 2 représente schématiquement les moyens essentiels et constitutifs du dispositif de la figure 1 selon l'invention;
- la figure 3 sont des courbes illustrant l'atténuation des vibrations sonores en présence/absence de moyens de filtrage par rétroaction, dans une bande de fréquences allant de 0 à 2500 Hz;
- les figures 4 et 5 sont des courbes illustrant l'atténuation des vibrations sonores en présence/absence de moyens de filtrage hybride selon l'invention, dans une bande de fréquences allant de 0 à 2500 Hz;
- les figures 6 et 7 sont des courbes illustrant l'atténuation des vibrations sonores en présence/absence des moyens de filtrage hybride selon l'invention, dans une bande de fréquences allant de 500 Hz à 1500 Hz;
- la figure 8 est une courbe illustrant l'atténuation des vibrations sonores en présence/absence des moyens de filtrage hybride selon l'invention, dans une bande de fréquences allant de 0 à 500 Hz;
- les figures 9, 10A et 10B sont des courbes illustrant l'atténuation des vibrations sonores en présence/absence des filtrage par anticipation;
- la figure 11 représente schématiquement la structure du dispositif d'atténuation multi-voies selon l'invention, dans lequel les filtrages par anticipation et par rétroaction sont numériques;
- la figure 12 représente schématiquement les éléments constitutifs du processeur esclave du dispositif de la figure 11;
- la figure 13 représente schématiquement la structure du dispositif d'atténuation multi-voies selon l'invention, dans lequel le filtrage par rétroaction est analogique; et
- la figure 14 représente schématiquement l'assemblage du filtrage par rétroaction analogique dans le dispositif de la figure 13.
- un microphone 8 disposé dans la cavité 2;
- un haut-parleur 10 disposé dans la cavité 2 à proximité du microphone 8;
- des moyens de pré-amplification 9 comprenant une entrée 7 reliée au microphone 8 et une sortie 11,
- des moyens de filtrage par rétroaction 12 comprenant une entrée 14 reliée à la sortie 11, et une sortie 16; et
- des moyens d'amplification 18 comprenant une entrée 20 reliée à la sortie 16, et une sortie 22 reliée à l'entrée du haut-parleur 10.
- un élément pré-amplificateur d'entrée PE possédant une entrée reliée aux moyens capteurs 8 ou 100 associés et une sortie;
- un filtre de conditionnement FAT spécifique à l'application choisie, de préférence de type anti-recouvrement possédant une entrée reliée à la sortie du pré-amplificateur d'entrée et une sortie; et
- un convertisseur analogique/numérique CAN possédant une entrée reliée à la sortie du filtre de conditionnement et une sortie.
- annulation des amplifications de signaux en haute fréquences liées aux instabilités par rétroaction;
- atténuation du bruit en dehors de la bande de traitement du filtrage par rétroaction (gain jusqu'à 10 dB par rapport au traitement passif des coquilles dans le cas du casque);
- amélioration du traitement dans la totalité de la bande de traitement de filtrage par rétroaction (gain jusqu'à 15 dB par rapport au filtrage par rétroaction seul), ce qui permet de le rendre encore plus linéaire;
- amélioration de la robustesse du système, par exemple aux effets Larsen;
- amélioration des performances par rapport à des filtrages par rétroaction et des filtrages par anticipation utilisés séparément.
- accélération de la convergence de l'algorithme de minimisation,
- amélioration de la robustesse des moyens de filtrage par anticipation (observable en comparant les courbes d'atténuation obtenues par les moyens de filtrage par anticipation seuls (figures 9, 10A et 10B) par rapport aux courbes d'atténuation obtenues par les moyens de filtrage hybride selon l'invention (figures 4 à 8).
- soit au nombre de capteurs 8, lorsque ce nombre est égal au nombre d'actionneurs 10,
- soit au nombre d'actionneurs 10, si ce nombre est inférieur au nombre de capteurs 8,
- soit au nombre de capteurs 8, si celui-ci est inférieur au nombre d'actionneurs 10.
Claims (17)
- Dispositif d'atténuation active de vibrations, du type comprenant:une ossature susceptible d'être sujette à des vibrations à atténuer;des premiers moyens capteurs de vibrations (8), disposés sur l'ossature selon une première relation géométrique prédéterminée par rapport à ladite ossature;des moyens actionneurs de vibrations (10), disposés sur l'ossature à proximité des premiers moyens capteurs (8); etdes moyens de filtrage comprenant au moins une entrée reliée aux premiers moyens capteurs et une sortie reliée aux moyens actionneurs, les moyens de filtrage étant agencés pour engendrer une atténuation active des vibrations sur l'ossature;des seconds moyens capteurs de vibrations (100), distants, disposés sur l'ossature selon une seconde relation géométrique prédéterminée par rapport à ladite ossature;des moyens sommateurs (110) possédant une première entree (112), une seconde entrée (114), et une sortie reliée aux moyens actionneurs (10);des moyens de filtrage par rétroaction (12) de type non adaptatif possédant une entrée reliée aux premiers moyens capteurs (8) et une sortie (16) reliée à la première entrée (112) des moyens sommateurs, et propres à engendrer une atténuation active de type non adaptatif des vibrations sur l'ossature, sans engendrer d'instabilité dans une première bande de fréquences;des moyens propres à mesurer au préalable, et en présence des moyens de filtrage par rétroaction, la fonction de transfert entre les moyens actionneurs (10) et les premiers moyens capteurs (8);des moyens de filtrage par anticipation (130) de type adaptatif comprenant une première entrée (132) reliée aux seconds moyens capteurs (100), une seconde entrée (134) reliée aux premiers moyens capteurs (8), et une sortie reliée à la seconde entrée (114) des moyens sommateurs (110);
- Dispositif selon la revendication 1, caractérisé en ce que l'ossature comprend au moins une cavité (2) délimitée par une oreille (4) et des moyens d'atténuation passif (6), les premiers moyens capteurs (8) et les moyens actionneurs (10) étant logés dans ladite cavité (2) tandis que les seconds moyens capteurs (100) étant disposés hors de la cavité.
- Dispositif selon la revendication 1, caractérisé en ce que l'ossature comprend une poutre de type métallique, ou une plaque, ou un treillis, ou un siège, ou une gaine de ventilation ou analogue.
- Dispositif selon la revendication 1, caractérisé en ce que les premiers moyens capteurs (8) comprennent au moins: un élément capteur de sons de type microphone, un élément capteur d'accélération de type accéléromètre, un élément capteur de déplacement, un élément capteur de vitesse, un élément capteur de contrainte, un élément capteur de force, ou analogue.
- Dispositif selon la revendication 4, caractérisé en ce que les premiers moyens capteurs (8) comprennent deux éléments capteurs, l'un étant associé aux moyens de filtrage par anticipation, l'autre étant associé aux moyens de filtrage par rétroaction.
- Dispositif selon la revendication 1, caractérisé en ce que les seconds moyens capteurs (100) comprennent au moins: un élément capteur de sons de type microphone, un élément capteur d'accélération de type accéléromètre, un élément capteur de déplacement, un élément capteur de vitesse, un élément capteur de contrainte, un élément capteur de force, ou analogue.
- Dispositif selon la revendication 1, caractérisé en ce que les moyens actionneurs (10) comprennent une source de sons de type haut-parleur, un corps d'épreuve, un pot vibrant, ou analogue.
- Dispositif selon l'une des revendications précédentes,
caractérisé en ce que les moyens de filtrage par rétroaction (12) comprennent une pluralité de filtres analogiques et/ou numériques actifs d'ordre supérieur ou égal à 1, agencés pour engendrer une fonction de transfert permettant d'éviter des instabilités dans la première bande de fréquences au sens de Nyquist et en ce que la fonction de transfert des moyens de filtrage par rétroaction est déterminée de telle sorte que la phase de ladite fonction de transfert ne passe pas par la valeur zéro dans la première bande. - Dispositif selon l'une quelconque des précédentes revendications, caractérisé en ce que les moyens de filtrage par rétroaction (12) sont à réponse impulsionnelle infinie.
- Dispositif selon l'une quelconque des précédentes revendications, caractérisé en ce que les moyens de filtrage par anticipation (130) comprennent:un premier module d'acquisition (A8) possédant une entrée reliée à la sortie des premiers moyens capteurs (8), et une sortie;un second module d'acquisition (A100) possédant une entrée reliée à la sortie des seconds moyens capteurs (100), et une sortie;des moyens de traitement numérique possédant une première entrée reliée à la sortie du premier module d'acquisition (A8), une seconde entrée reliée à la sortie du second module d'acquisition (A100), et une sortie, lesdits moyens de traitement numérique étant propres à commander l'algorithme - de minimisation de l'énergie des vibrations captées par les premiers moyens capteurs (8) en fonction de l'énergie des vibrations captées par les seconds moyens capteurs (100); etun module de restitution (R) possédant une entrée reliée à la sortie des moyens de traitement numérique et une sortie reliée à la seconde entrée (114) des moyens sommateurs.
- Dispositif selon la revendication 10, caractérisé en ce que les premier et second modules d'acquisition (A8 et A100) comprennent:un élément pré-amplificateur d'entrée (PE) possédant une entrée recevant les signaux issus des premiers moyens capteurs (8) ou des seconds moyens capteurs (100), et une sortie;un filtre de conditionnement (FAT) adapté à l'application choisie et possédant une entrée reliée à la sortie de l'élément pré-amplificateur d'entrée, et une sortie; etun convertisseur analogique/numérique (CAN) possédant une entrée reliée à la sortie du filtre de conditionnement et une sortie reliée à une entrée des moyens de traitement numérique.
- Dispositif selon la revendication 10, caractérisé en ce que le module de restitution (R) comprend:un convertisseur numérique/analogique (CNA) possédant une entrée reliée à la sortie des moyens de traitement numérique et une sortie; etun filtre de lissage (FLR) possédant une entrée reliée à la sortie du convertisseur numérique/analogique et une sortie reliée à la seconde entrée (114) des moyens sommateurs (110).
- Dispositif selon la revendication 10, caractérisé en ce que les moyens de filtrage par anticipation (130) sont à réponse impulsionnelle finie et en ce que l'algorithme de minimisation est du type des moindres carrés moyens.
- Dispositif selon la revendication 10, caractérisé en ce que les moyens de traitement numérique sont du type processeur de signal numérique.
- Dispositif selon l'une quelconque des précédentes revendications, caractérisé en ce qu'il comprend une pluralité de premiers moyens capteurs (8-1,8-2,8-3,...), et de moyens actionneurs (10-1,10-2,...) et en ce que le dispositif est articulé autour d'une structure à multiprocesseurs maítre/esclaves, chaque processeur esclave (DSPE-1) étant chargé de piloter un seul moyen actionneur (10-1).
- Procédé d'atténuation vibratoire active, notamment acoustique, du type comprenant les étapes suivantes:a) prévoir une ossature susceptible d'être sujette à des vibrations à atténuer,b) prévoir des premiers moyens capteurs de vibrations (8), disposés sur l'ossature selon une première relation géométrique prédéterminée par rapport à ladite ossature,c) prévoir des moyens actionneurs de vibrations (10), disposés sur l'ossature à proximité des premiers moyens capteurs,d) prévoir des moyens de filtrage comprenant au moins une entrée reliée aux premiers moyens capteurs (8) et une sortie (16),e) agencer les moyens de filtrage pour engendrer une atténuation active des vibrations sur l'ossature,f) prévoir des seconds moyens capteurs de vibrations (100), distants, disposés sur l'ossature selon une seconde relation géométrique prédéterminée,g) prévoir des moyens sommateurs (110) possédant une première entrée (112), une seconde entrée (114), et une sortie reliée aux moyens d'actionneurs (10),
caractérisé en ce qu'il comprend en outre les étapes suivantes:h) prévoir des moyens de filtrage par rétroaction (12) de type non adaptatif, possédant une entrée reliée aux premiers moyens capteurs (8) et une sortie (16) reliée à la première entrée (112) des moyens sommateurs, et agencer lesdits moyens de filtrage par rétroaction pour engendrer une atténuation active de type non adaptatif des vibrations sur l'ossature, sans engendrer d'instabilité dans une première bande de fréquences;i) mesurer au préalable, et en présence des moyens de filtrage par rétroaction, la fonction de transfert entre les moyens actionneurs (10) et les premiers moyens capteurs (8);j) prévoir des moyens de filtrage par anticipation (130) de type non adaptatif comprenant une première entrée (132) reliée aux seconds moyens capteurs (100), une seconde entrée (134) reliée aux premiers moyens capteurs (8), et une sortie reliée à la seconde entrée (114) des moyens sommateurs (110);k) adapter les coefficients de filtrage (140) des moyens de filtrage par anticipation (130) en temps réel selon un algorithme choisi pour minimiser l'énergie des vibrations captées par les premiers moyens capteurs (8) en fonction de l'énergie des vibrations captées par les seconds moyens capteurs (100), et la fonction de transfert préalablement mesurée; - Procédé selon la revendication 16, caractérisé en ce qu'il est mis en oeuvre par un dispositif selon l'une quelconque des revendications 1 à 15.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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FR9511327 | 1995-09-27 | ||
FR9511327A FR2739214B1 (fr) | 1995-09-27 | 1995-09-27 | Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues |
PCT/FR1996/001512 WO1997012359A1 (fr) | 1995-09-27 | 1996-09-27 | Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues |
Publications (2)
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EP0852793A1 EP0852793A1 (fr) | 1998-07-15 |
EP0852793B1 true EP0852793B1 (fr) | 2001-11-28 |
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EP96932664A Expired - Lifetime EP0852793B1 (fr) | 1995-09-27 | 1996-09-27 | Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues |
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US (1) | US6449369B1 (fr) |
EP (1) | EP0852793B1 (fr) |
AT (1) | ATE209813T1 (fr) |
AU (1) | AU719457B2 (fr) |
CA (1) | CA2231071C (fr) |
DE (1) | DE69617449T2 (fr) |
FR (1) | FR2739214B1 (fr) |
WO (1) | WO1997012359A1 (fr) |
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US20040086135A1 (en) * | 2002-11-01 | 2004-05-06 | Siemens Vdo Automotive Inc. | Active noise control system using pure feedforward method with order-based offline calibration |
FR2857551B1 (fr) * | 2003-04-30 | 2007-12-28 | Senneisher Electronic Gmbh & C | Dispositif pour capter ou reproduire des signaux audio |
GB2401744B (en) * | 2003-05-14 | 2006-02-15 | Ultra Electronics Ltd | An adaptive control unit with feedback compensation |
US7181296B2 (en) * | 2003-08-06 | 2007-02-20 | Asml Netherlands B.V. | Method of adaptive interactive learning control and a lithographic manufacturing process and apparatus employing such a method |
US7308106B2 (en) * | 2004-05-17 | 2007-12-11 | Adaptive Technologies, Inc. | System and method for optimized active controller design in an ANR system |
DE102005016204A1 (de) * | 2005-04-07 | 2006-10-12 | Sennheiser Electronic Gmbh & Co. Kg | Kopfhörer zum Anschluss an eine externe aktive Lärmkompensationsvorrichtung |
WO2007013622A1 (fr) * | 2005-07-29 | 2007-02-01 | Matsushita Electric Industrial Co., Ltd. | Dispositif de haut-parleur |
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JP5564743B2 (ja) * | 2006-11-13 | 2014-08-06 | ソニー株式会社 | ノイズキャンセル用のフィルタ回路、ノイズ低減信号生成方法、およびノイズキャンセリングシステム |
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-
1995
- 1995-09-27 FR FR9511327A patent/FR2739214B1/fr not_active Expired - Fee Related
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1996
- 1996-09-27 US US09/043,822 patent/US6449369B1/en not_active Expired - Lifetime
- 1996-09-27 DE DE69617449T patent/DE69617449T2/de not_active Expired - Lifetime
- 1996-09-27 WO PCT/FR1996/001512 patent/WO1997012359A1/fr active Search and Examination
- 1996-09-27 AT AT96932664T patent/ATE209813T1/de not_active IP Right Cessation
- 1996-09-27 CA CA002231071A patent/CA2231071C/fr not_active Expired - Lifetime
- 1996-09-27 AU AU71360/96A patent/AU719457B2/en not_active Expired
- 1996-09-27 EP EP96932664A patent/EP0852793B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2739214A1 (fr) | 1997-03-28 |
DE69617449D1 (de) | 2002-01-10 |
DE69617449T2 (de) | 2002-08-01 |
CA2231071C (fr) | 2009-01-27 |
WO1997012359A1 (fr) | 1997-04-03 |
CA2231071A1 (fr) | 1997-04-03 |
US6449369B1 (en) | 2002-09-10 |
FR2739214B1 (fr) | 1997-12-19 |
AU719457B2 (en) | 2000-05-11 |
AU7136096A (en) | 1997-04-17 |
EP0852793A1 (fr) | 1998-07-15 |
ATE209813T1 (de) | 2001-12-15 |
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