EP3371521B1 - Apparatus for natural ventilation of a room having a ventilation passage combined with a noise absorber - Google Patents
Apparatus for natural ventilation of a room having a ventilation passage combined with a noise absorber Download PDFInfo
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- EP3371521B1 EP3371521B1 EP16809959.6A EP16809959A EP3371521B1 EP 3371521 B1 EP3371521 B1 EP 3371521B1 EP 16809959 A EP16809959 A EP 16809959A EP 3371521 B1 EP3371521 B1 EP 3371521B1
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- opening frame
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/18—Air-flow control members, e.g. louvres, grilles, flaps or guide plates specially adapted for insertion in flat panels, e.g. in door or window-pane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- 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
- G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
-
- 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
- G10K2210/129—Vibration, e.g. instead of, or in addition to, acoustic noise
-
- 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
- G10K2210/3211—Active mounts for vibrating structures with means to actively suppress the vibration, e.g. for vehicles
Definitions
- the subject of the invention is an installation for the natural ventilation of a room having a ventilation passage associated with a sound absorber.
- This ventilation passage communicates between the exterior of the building and the interior of said building so as to allow natural ventilation between the exterior and interior of said building. More precisely, it has a first end, closed off by a hatch and opening into the building, and a second end opening out to the outside of said building.
- a sound absorber is installed in the ventilation passage to reduce the noise.
- the damper comprises at least one monitoring microphone installed to pick up noise in the ventilation passage, and at least one loudspeaker provided with a vibrating membrane adapted to generate counter noise in the ventilation passage in response to the picked up noise. through the monitoring microphone.
- the WISEMAN installation has certain drawbacks. First of all, it is necessary to provide a hatch to release the first end of the ventilation passage and initiate natural ventilation. The handling and access to this hatch are not necessarily easy for some people, especially the elderly. In addition, this hatch can be the source of thermal leakage harmful to the insulation of the building.
- the installation is complex to perform and to install.
- the ventilation passage is either installed in the opening frame of the door or window, or between the fixed frame and a masonry wall. It is therefore necessary to provide substantial modifications to the opening frames of the door or window and / or a masonry structure for the installation of the ventilation passage.
- the invention aims to remedy this state of affairs.
- an objective of the invention is to simplify the design of the ventilation passage as well as its handling.
- Another objective of the invention is to reduce the risks of thermal leakage at the level of the ventilation passage.
- Yet another objective of the invention is to simplify the positioning of the ventilation passage.
- the present invention relates to an installation for the natural ventilation of a room, which is characterized by a particular design of the ventilation passage and of the noise damper that it comprises.
- the installation includes a room L delimited by walls P.
- This room can be a room in a house or an office.
- the walls P are typically masonry walls.
- At least one door or a window F is installed in one of the walls P of the room L. To simplify the understanding of the invention, the remainder of the description only mentions one window F.
- This window F is preferably a multi-glazed window, for example double glazing, but can be single-glazed. It forms an interface between the interior of the room L and the exterior of said room.
- the window F in itself is of the known type. It consists of one or more V, V 'leaves as illustrated on figure 1 .
- Each leaf V, V ' consists of an opening frame 30, 30' (simply called "opening" in joinery) formed by horizontal profiles 30a, 30'a and vertical 30b1, 30b2, 30'b1, 30'b2 framing at least one glazed panel 4, 4 '.
- the opening frames 30, 30 ' have a generally rectangular shape, which borders the respective panels 4, 4' on its four sides. They are preferably identical.
- the opening frames 30, 30 ' are movably mounted in a fixed frame 31 (simply called “frame” in carpentry) fixed to the wall P.
- This fixed frame 31 is secured to the wall P and more generally to the shell or to the frame. the assembly where the window F must be placed. It is also formed by horizontal 31a and vertical 31b1, 31b2 sections framing the opening frames 30, 30 '.
- the dimensions of the opening frames 30, 30' in width are substantially equal to half those of the fixed frame 31 which surrounds them. Their height dimensions are substantially equal to that of the fixed frame 31, except for the thicknesses of the profiles.
- the opening frames 30, 30 ' have a width of 1.5 m and a height of 2.5 m.
- the profiles 30a, 30'a, 30b1, 30b2, 30'b1, 30'b2, 31a, 31b1, 31b2 are rigid, made of metal such as aluminum or other, of wood, of plastic, or even of a combination of such materials.
- window F is a sliding window.
- At least the leaf V is capable of moving by sliding laterally on at least one horizontal carrier rail 31c mounted in the fixed frame 31, and in particular in its lower part.
- the opening frame 30 may comprise one or more carriages with casters or rollers, suitable for ensuring its sliding in the rail 31c.
- the opening frame 30 is movable between a closed position ( figures 1 , 2 and 5 ) where it closes the fixed frame 31 and an open position where it releases it.
- the open position ensures natural ventilation between the inside and the outside E of the room L.
- the two leaves V, V ' are an extension of each other, while in the open position they overlap.
- the lateral vertical profile 30b1 of the opening frame 30 penetrates into the corresponding vertical profile 31b1 of the fixed frame 31, these two profiles joining together hermetically.
- these two profiles 30b1, 31b1 comprise mutual locking means for locking the leaf V in this position.
- no ventilation between the interior and the exterior E of the room L is possible through the window F.
- the lateral vertical section 30b1 of the opening frame 30 separates from the corresponding vertical section 31b1 of the fixed frame 31, and moves away from the latter. Natural ventilation is possible between the interior and exterior E of room L, through window F.
- the lateral vertical profile 30b1 of the opening frame 30 moves away from the corresponding vertical profile 31b1 of the fixed frame 31, by a predetermined distance (for example between 2 cm and 15 cm, preferably 10 cm) when the leaf V slides. Natural ventilation remains possible between the interior and exterior E of room L, through window F.
- the ventilation passage 1 is formed. It is delimited by the space separating the lateral vertical section 30b1 of the opening frame 30 from the corresponding vertical section 31b1 of the fixed frame 31 when said opening frame 30 is in the intermediate open position. Passage 1 communicates between the outside E of the room L and the inside of the said room. so as to allow natural ventilation between the outside E and the inside of said room, over the entire height of the window F. This natural ventilation is shown diagrammatically on the figures 4 and 6 by the arrow drawn in passage 1.
- the width of the ventilation passage 1 corresponds to the sliding distance of the leaf V from the closed position to the intermediate open position, for example between 2 cm and 15 cm, preferably 10 cm. In the closed position, the ventilation passage 1 has zero thickness. Any ventilation between the interior and exterior E of room L through ventilation passage 1 is prohibited.
- the ventilation passage 1 is delimited by the profiles 30b1 and 31b1, it is not necessary to add an additional accessory likely to reduce the total glazed surface of the window F and the lighting of the room L. Thanks to the invention, this total glazed surface and this illumination are fully preserved.
- an element 310c forming a stop when the opening frame 30 is in the intermediate open position.
- This element 310c is clearly visible on the figures 2 and 5 and is for example in the form of an elastomeric rib installed in the rail 31c.
- An active noise damper 2 is associated with the ventilation passage 1. This damper is used for active or passive noise control. It is directly integrated into one of the aforementioned profiles 30b1 or 31b1.
- the noise damper 2 is directly installed in the first section 31b1 of the fixed frame 31.
- the sound absorber 2 is directly installed in the first section 30b1 of the opening frame 30.
- An active damper 2 generates, in the ventilation passage 1, a sound level equivalent to the ambient sound level to be controlled, in particular a noise coming from a noise source located outside E of the room L. In practice, this damper 2 active generates a counter noise which is superimposed on the sound waves propagating in the ventilation passage 1.
- the active noise damper 2 may be in the form of a piezoelectric actuator or of a loudspeaker.
- a linear loudspeaker of the type described in the patent document is used. US 6,285,773 (Carmel ) aforementioned, and to which those skilled in the art may refer where appropriate.
- This type of linear loudspeaker can in fact be easily accommodated in a reduced volume and in particular in a narrow space, while having an efficiency comparable to that of a conventional loudspeaker with conical membranes.
- the geometric shape and the particular arrangement of the constituent elements of the linear loudspeaker offer a very satisfactory performance. In particular, given the considerable length of the membrane, the latter displaces a large mass of air during its vibration, which makes it possible to have good efficiency in the low frequencies.
- This linear loudspeaker is for example installed vertically over the entire length of the profile 30b1 or 31b1.
- the linear loudspeaker can however be replaced by several circular loudspeakers 22 installed side by side over the entire length of the profile 30b1. or 31b1 as shown on the figures 1 and 3 . It is for example possible to use ASCA loudspeakers marketed by the applicant.
- loudspeaker is used in the remainder of the description, bearing the reference 22, whether the latter is a loudspeaker as such (linear or circular) or a piezoelectric actuator.
- the noise damper 2 can comprise a single linear loudspeaker or several circular loudspeakers 22 arranged along the profile 30b1 or 31b1. Integration into the fixed frame 31 makes it possible to simplify the design of the shock absorber 2 and its wiring. The choice of the number of loudspeakers and their arrangement depends on the sound field to be attenuated, by superposition, of the noise propagating in the passage ventilation unit 1, to increase sound insulation when the window is in the intermediate open position.
- the loudspeaker 22 comprises a membrane 220 adapted to vibrate and generate a counter noise in the ventilation passage 1.
- An actuator 221 is associated with the membrane 220. This actuator 221 is adapted to induce a vibratory movement in the membrane 220. It may be a piezoelectric actuator or more conventionally an actuator using an arrangement of magnets and electrically excited coil to cause the membrane 220 to vibrate which generates the counter noise.
- At least one microphone 21 is installed in the ventilation passage 1 to pick up the acoustic signals propagating in the latter.
- the microphone 21 sends a signal representative of the noise in the ventilation passage 1 to a control electronics 23. Consequently, the control electronics 23 sends a control signal to the actuator 221 as a function of the control electronics. acoustic signals picked up by the microphone 21.
- the damper 2 thus makes it possible to increase the sound insulation of the window F while it is in the intermediate open position.
- the microphone 21 is advantageously a control microphone connected to the control electronics 23.
- This control microphone 21 is installed in the ventilation passage 1 so that it is as far as possible from the noise source S.
- the monitoring microphone 21 is offset from the longitudinal median plane MP of the profile 30b1, 31b1 on which it is installed, opposite the source of noise S to be attenuated.
- the noise source S is the ambient noise prevailing outside the room L (for example the noise of vehicles traveling in a street or on a road, the noise of an airplane engine, etc.)
- the control microphone 21 is offset from the longitudinal median plane MP, towards the room L.
- the noise source S is the ambient noise prevailing inside the room L (for example the music of a discotheque)
- the microphone of control 21 is offset from the longitudinal median plane MP, outwards E.
- the applicant has been able to observe, surprisingly, that the noise attenuation was effective and stable, in a relatively wide frequency band from 0 Hz to 650 Hz, and more particularly from 70 Hz to 650 Hz.
- the monitoring microphone 21 is oriented in a direction which is perpendicular to the direction of propagation, in the ventilation passage 1, of the acoustic signals coming from the noise source S.
- the monitoring microphone 21 is thus oriented in a direction which is parallel to the direction of movement of the leaf V, that is to say parallel to the longitudinal median plane MP.
- the monitoring microphone 21 satisfactorily collects the residual acoustic signal which is used as an error signal in the feedback filtering described below in the description.
- This residual acoustic signal is a combination of the noise residual reaching inside the room L and a counter noise generated by the loudspeaker 22 which is ideally the reverse copy of the noise to be removed from the source S.
- the monitoring microphone 21 is installed on the same profile 30b1, 31b1 as that in which the loudspeaker 22 is installed. More particularly, the monitoring microphone 21 is adjacent to the membrane 220. This configuration simplifies the design of the damper. noise 2 insofar as all its constituent elements are grouped together in one and the same profile 30b1, 31b1.
- the control microphone 21 can however be installed in the ventilation passage 1, on another profile which is remote from the profile 30b1, 31b1 in which the loudspeaker 22 is installed.
- the control microphone 21 can for example be arranged on the profile 30b1 of the opening frame 30 which is opposite to the profile 31b1 of the fixed frame 31 in which the loudspeaker 22 is installed.
- the reverse configuration can of course be envisaged.
- the control microphone 21 can also be installed on one of the horizontal profiles 31a of the fixed frame, in the ventilation passage 1, while the loudspeaker 22 is installed on one of the vertical profiles 30b1 or 30b2, and vice versa.
- control electronics 23 comprises a non-adaptive type feedback filtering means FB (in English "FEEDBACK”) having an input FBe connected to the control microphone 21 and an output FBs connected to the actuator 11.
- FB in English "FEEDBACK”
- the feedback active attenuation technique is based on a feedback loop arranged to generate active attenuation of the sound waves propagating in the ventilation passage 1.
- the signal measured by the monitoring microphone 21 is injected into the actuator. 221 through the feedback filtering means FB which corrects said signal in an attempt to cancel its energy.
- This retroactive technique makes it possible to obtain acoustic attenuation with a certain gain, without causing instability in a processing frequency band. Most often, this processing frequency band corresponds to low frequencies, for example sound waves at the frequency band ranging from 0 to 400 Hz and more particularly from 70 Hz to 400 Hz.
- the control electronics 23 advantageously comprise: - pre-amplification means comprising an input connected to the control microphone 21 and an output connected to the input FBe of the feedback filtering means FB; - And amplification means comprising an input connected to the output FBs of the feedback filtering means FB, and an output connected to the actuator 221.
- This control electronics 23 here constitutes a feedback loop arranged to generate active acoustic attenuation without causing instability in a chosen frequency band.
- the frequency band in which the feedback filtering means FB is effective without generating instability in the Nyquist sense is of the order of 0 to 650 Hz for sound waves, and more particularly from 70 Hz to 650 Hz.
- the feedback filtering means FB comprises a plurality of active analog filters of order greater than or equal to 1, arranged to generate a transfer function making it possible to avoid instabilities in the frequency band 0-650 Hz in the sense of Nyquist, more particularly in the 70-650 Hz band, and the transfer function of the filtering means FB is determined such that the phase of said transfer function does not pass through the value 0 in the 0-600 Hz band , and more particularly the 70-600 Hz band.
- the control electronics 23 comprises for this purpose an anticipatory filtering means FF (in English “FEEDFORWARD”), having an input FFe connected to a reference microphone 25 and an output FFs connected to the actuator 221.
- FF in English “FEEDFORWARD”
- a reference acoustic field upstream of the propagation of the acoustic field in the ventilation passage 1, is detected by the reference microphone 25, then processed by the filtering means FF in order to determine the command to apply to actuator 221.
- pre-amplification means comprising an input connected to the reference microphone 25 and an output connected to the input FFe of the feedforward filtering means FF
- - And amplification means comprising an input connected to the output FFs of the feedforward filtering means FF, and an output connected to the actuator 221.
- the control electronics 23 comprises a summing means 24 having: a first input 24e1 connected to the output FBs of the feedback filtering means FB; a second input 24e2 connected to the output FFs of the anticipatory filtering means FF; - And an output 24s connected to the actuator 221.
- the output signal of the summing means 24 which is applied to the actuator 11 is thus a linear combination of the signals coming from the channels of feedback and anticipation filtering.
- Amplification means are advantageously provided comprising an input connected to the output 24s of the summing means 24, and an output connected to the actuator 221.
- the anticipation technique is articulated around the anticipatory filtering means FF of the non-adaptive or adaptive type. Compared to non-adaptive filtering, adaptive filtering is more efficient in terms of noise attenuation, but requires more computing power and higher production cost.
- the anticipatory filtering means FF is of the non-adaptive type, its transfer function is a fixed function which is preset and which does not vary.
- the transfer function is modified dynamically, continuously, by an algorithm for real-time analysis of the acoustic signal coming from the source S.
- the coefficients of the FF feed-forward filtering means are adapted. in real time according to an algorithm chosen so as to minimize the energy of the vibrations picked up by the control microphone 21 as a function of the energy of the reference vibrations picked up by the reference microphone 25.
- the anticipatory filtering means FF comprises: a first input FFe1 connected to the monitoring microphone 21; and a second input FFe2 connected to the reference microphone 25.
- the anticipatory filtering means FF comprises filters with finite impulse response of the adaptive type. The coefficients of these filters are updated in real time by a minimization algorithm which takes into account the signals picked up by the control microphone 21.
- the minimization algorithm is of the least squares means type, also called LMS for " LEAST MEAN SQUARES "or more advantageously of the least type mean squares with filtered reference, also called FXLMS for “Filtered-X Least Mean Squares”.
- the transfer function of the so-called secondary path between the loudspeaker 22 and the control microphone 21 is measured, sampled and saved in the memory of a processor of the control electronics 23. This function transfer thus previously measured will then be used in the calibration phase for the adaptation of the filtering elements by anticipation. This step is carried out in a manner known to those skilled in the art.
- the active attenuation of the “hybrid” type obtained according to the invention results from a combination of the anticipation and feedback filtering means in which the anticipation filtering is grafted onto the feedback filtering or vice versa.
- This makes it possible to linearize the feedback attenuation in a whole frequency band wider than the frequency band (0-650 Hz, and more particularly 70-650 Hz) processed directly by the means of feedback filtering FB, to accelerate the convergence of the minimization algorithm, and to improve the robustness of the feedforward filtering means FF.
- This improves the gain of active attenuation in a widened band which can go up to 4000 Hz, by eliminating the pumping effect mentioned above.
- the reference microphone 25 is installed on the same profile 30b1, 31b1 as that in which the loudspeaker 22 is installed. Unlike the control microphone 21, it is installed outside the ventilation passage 1 and oriented towards the source of noise S. The reference microphone 25 can thus optimally capture the copy of the noise to be removed from the source S and transmit this signal to the control electronics 23.
- the reference microphone 25 is oriented in a direction which is parallel to the direction of propagation of the acoustic signals coming from the noise source S.
- the reference microphone 25 is thus oriented in a direction which is perpendicular to the direction of displacement of the membrane 220, that is to say perpendicular to the longitudinal median plane MP of the profile 30b1 , 31b1.
- the reference microphone 25 satisfactorily collects the acoustic signal coming from the noise source S, without being disturbed by the counter noise generated by the loudspeaker 22.
- the reference microphone 25 and the monitoring microphone 21 are carried by the same section 30b1, 31b1.
- the reference microphone 25 can for example be arranged on the profile 30b1 of the opening frame 30 which is opposite the vertical profile 31b1 in which the loudspeaker 22 and the monitoring microphone 21 are installed. 'one of the horizontal profiles 31a of the fixed frame 31, while the loudspeaker 22 and the control microphone 21 are installed on one of the profiles 30b1, 31b1, and vice versa.
- Noise damper 2 does not need to be activated when window F is in the closed position.
- a switch is adapted to activate the noise damper 2.
- the switch 5 is in the form of a toggle or push-button switch installed in the room L, on a wall P, which switch is of the type traditionally used for lighting. By manipulating this switch 5, the user can activate or deactivate the noise damper 2, for example by controlling the power supply to the control electronics 23.
- the switch is controlled by the movement of the window F so that when said window passes from the closed position to the intermediate open position, said switch automatically activates the active noise damper 2.
- a position sensor can be installed in the rail 31c. When the window F is in the intermediate open position, the position sensor cooperates with the switch so that the latter automatically activates the active noise damper 2.
- This switch can also be adapted to automatically deactivate the active noise damper 2 when the window F is in the closed position or not in the intermediate open position.
- the damper 2 can also be passive, that is to say that it is suitable for absorbing all or part of the sound waves propagating in the ventilation passage 1.
- the faces of the profiles 30b1, 31b1, 31a which are located in the ventilation passage 1 and which delimit said passage on these four sides may be partially or totally covered with a sound-insulating material.
- the noise damper 2 is installed in the profile 31b1 of the fixed frame 31.
- the face of the corresponding profile 30b1 of the opening frame 30, which is located opposite the damper 2 is coated with the sound-insulating material 13.
- the noise damper 2 is installed in the profile 30b1 of the opening frame 31.
- the face of the corresponding profile 31b1 of the fixed frame 31, which is located opposite the damper 2 is coated with the sound-insulating material 13 .
- damper 2 is passive.
- a flexible membrane 220 is simply suspended from the side walls of a cavity 223 provided in the profile 30b1, 31b1.
- the membrane 220 closes the cavity 223 so as to be able to vibrate in the ventilation passage 1.
- the membrane 220 absorbs all or part of the sound waves propagating in the ventilation passage 1, making it possible to increase the sound insulation.
- the membrane 220 is for example formed by a film with elastic properties, such as an elastomer having elastic power or a polyethylene film.
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Description
L'invention a pour objet une installation pour la ventilation naturelle d'un local présentant un passage de ventilation associé à un amortisseur de bruit.The subject of the invention is an installation for the natural ventilation of a room having a ventilation passage associated with a sound absorber.
Elle concerne le domaine technique des aménagements particuliers permettant d'assurer la ventilation naturelle d'un local au travers d'une porte ou d'une fenêtre.It relates to the technical field of special arrangements making it possible to ensure the natural ventilation of a room through a door or a window.
On connait par les documents brevets
Ce passage de ventilation communique entre l'extérieur du bâtiment et l'intérieur dudit bâtiment de manière à permettre une ventilation naturelle entre l'extérieur et l'intérieur dudit bâtiment. Plus précisément, il présente une première extrémité, obturée par une trappe et débouchant dans le bâtiment, et une seconde extrémité débouchant à l'extérieur dudit bâtiment.This ventilation passage communicates between the exterior of the building and the interior of said building so as to allow natural ventilation between the exterior and interior of said building. More precisely, it has a first end, closed off by a hatch and opening into the building, and a second end opening out to the outside of said building.
Dans l'installation WISEMAN, un amortisseur de bruit est installé dans le passage de ventilation pour réduire le bruit. L'amortisseur comprend au moins un microphone de contrôle installé pour capter le bruit dans le passage de ventilation, et au moins un haut-parleur pourvu d'une membrane vibrante adaptée pour générer un contre bruit dans le passage de ventilation en réponse au bruit capté par le microphone de contrôle.In the WISEMAN installation, a sound absorber is installed in the ventilation passage to reduce the noise. The damper comprises at least one monitoring microphone installed to pick up noise in the ventilation passage, and at least one loudspeaker provided with a vibrating membrane adapted to generate counter noise in the ventilation passage in response to the picked up noise. through the monitoring microphone.
L'installation WISEMAN présente certains inconvénients. Tout d'abord, il est nécessaire de prévoir une trappe pour libérer la première extrémité du passage de ventilation et initier la ventilation naturelle. La manipulation et l'accès à cette trappe ne sont pas forcément aisés pour certaines personnes, notamment des personnes âgées. En outre, cette trappe peut être à l'origine de fuite thermique néfaste à l'isolation du bâtiment.The WISEMAN installation has certain drawbacks. First of all, it is necessary to provide a hatch to release the first end of the ventilation passage and initiate natural ventilation. The handling and access to this hatch are not necessarily easy for some people, especially the elderly. In addition, this hatch can be the source of thermal leakage harmful to the insulation of the building.
En outre l'installation est complexe à réaliser et à installer. En effet, le passage de ventilation est soit installé dans le châssis ouvrant de la porte ou de la fenêtre, soit entre le châssis dormant et une paroi maçonnée. Il est donc nécessaire de prévoir des modifications substantielles sur les châssis ouvrants de la porte ou de la fenêtre et/ou un ouvrage de maçonnerie pour la mise en place du passage de ventilation.In addition, the installation is complex to perform and to install. Indeed, the ventilation passage is either installed in the opening frame of the door or window, or between the fixed frame and a masonry wall. It is therefore necessary to provide substantial modifications to the opening frames of the door or window and / or a masonry structure for the installation of the ventilation passage.
L'invention vise à remédier à cet état des choses. En particulier, un objectif de l'invention est de simplifier la conception du passage de ventilation ainsi que sa manipulation.The invention aims to remedy this state of affairs. In particular, an objective of the invention is to simplify the design of the ventilation passage as well as its handling.
Un autre objectif de l'invention est de réduire les risques de fuite thermique au niveau du passage de ventilation.Another objective of the invention is to reduce the risks of thermal leakage at the level of the ventilation passage.
Encore un autre objectif de l'invention est de simplifier la mise en place du passage de ventilation.Yet another objective of the invention is to simplify the positioning of the ventilation passage.
La solution proposée par l'invention est une installation pour la ventilation d'un local, ladite installation comprenant :
- un local délimité par des parois,
- au moins une porte ou une fenêtre installée dans une des parois du local et comprenant un châssis ouvrant réalisé par des profilés supportant au moins un panneau vitré, lequel châssis ouvrant est monté mobile dans un châssis dormant fixe formé par des profilés encadrant ledit châssis ouvrant,
- un passage de ventilation qui communique entre l'extérieur du local et l'intérieur dudit local de manière à permettre une ventilation naturelle entre l'extérieur et l'intérieur dudit local,
- un amortisseur de bruit actif adapté pour atténuer les ondes sonores se propageant dans le passage de ventilation, laquelle atténuation est réalisée par la génération d'un contre bruit qui se superpose auxdites ondes sonores,
- le châssis ouvrant est monté mobile dans le châssis dormant entre une position fermée où un premier profilé du châssis ouvrant se solidarise avec un premier profilé correspondant du châssis dormant et une position ouverte où le premier profilé du châssis ouvrant est écarté du premier profilé du châssis dormant.
- a room delimited by walls,
- at least one door or window installed in one of the walls of the room and comprising an opening frame made by profiles supporting at least one glazed panel, which opening frame is movably mounted in a fixed fixed frame formed by profiles framing said opening frame,
- a ventilation passage which communicates between the outside of the room and the inside of said room so as to allow natural ventilation between the outside and the inside of said room,
- an active noise damper adapted to attenuate the sound waves propagating in the ventilation passage, which attenuation is achieved by the generation of a counter noise which is superimposed on said sound waves,
- the opening frame is movably mounted in the fixed frame between a closed position where a first section of the opening frame is joined to a corresponding first section of the frame and an open position where the first section of the opening frame is separated from the first section of the frame of the frame .
Cette installation est remarquable en ce que :
- dans une position ouverte intermédiaire, le premier profilé du châssis ouvrant est écarté du premier profilé du châssis dormant d'une distance prédéterminée,
- le passage de ventilation est délimité par l'espace séparant le premier profilé du châssis ouvrant du premier profilé du châssis dormant lorsque ledit châssis ouvrant est dans la position ouverte intermédiaire,
- l'amortisseur de bruit est directement installé dans le premier profilé du châssis ouvrant et/ou dans le premier profilé du châssis dormant,
- lorsque le châssis ouvrant est dans la position fermée, les premiers profilés se solidarisent de sorte que le passage de ventilation est obturé hermétiquement, toute ventilation entre l'intérieur et l'extérieur du local par ledit passage de ventilation étant interdite.
- in an intermediate open position, the first section of the opening frame is spaced from the first section of the fixed frame by a predetermined distance,
- the ventilation passage is delimited by the space separating the first section of the opening frame from the first section of the fixed frame when said opening frame is in the intermediate open position,
- the sound absorber is installed directly in the first section of the opening frame and / or in the first section of the fixed frame,
- when the opening frame is in the closed position, the first profiles join together so that the ventilation passage is hermetically sealed, any ventilation between the interior and the exterior of the room through said ventilation passage being prohibited.
C'est donc maintenant en manipulant simplement et directement la porte ou la fenêtre, que l'utilisateur peut autoriser ou interdire la ventilation naturelle au travers du passage de ventilation. De plus, il n'est plus nécessaire de prévoir une trappe comme dans l'installation WISEMAN, ce qui simplifie la conception du passage de ventilation. En outre, les profilés des châssis ouvrant et dormant fermant hermétiquement le passage de ventilation, les déperditions thermiques sont réduites, voire nulles, à ce niveau.It is therefore now by simply and directly manipulating the door or window, that the user can authorize or prohibit natural ventilation through the ventilation passage. In addition, it is no longer necessary to provide a hatch as in the WISEMAN installation, which simplifies the design of the ventilation passage. In addition, the profiles of the opening and fixed frames hermetically closing the ventilation passage, heat losses are reduced, or even zero, at this level.
D'autres caractéristiques avantageuses de l'invention sont listées ci-dessous. Chacune de ces caractéristiques peut être considérée seule ou en combinaison avec les caractéristiques remarquables définies ci-dessus, et faire l'objet, le cas échéant, d'une ou plusieurs demandes de brevet divisionnaires :
- Les premiers profilés sont avantageusement des profilés verticaux.
- L'amortisseur de bruit peut être directement installé dans le premier profilé du châssis dormant ; le premier profilé correspondant du châssis ouvrant présentant une face qui est située en vis-à-vis de l'amortisseur de bruit, laquelle face est revêtue d'un matériau isolant phonique.
- Dans une variante de réalisation, l'amortisseur de bruit peut être directement installé dans le premier profilé du châssis ouvrant ; le premier profilé correspondant du châssis dormant présentant une face qui est située en vis-à-vis de l'amortisseur de bruit, laquelle face est revêtue d'un matériau isolant phonique.
- L'amortisseur de bruit comprend avantageusement au moins un microphone agencé pour capter le bruit dans le passage de ventilation et au moins un haut-parleur adapté pour générer un contre bruit dans le passage de ventilation en réponse au bruit capté par le microphone.
- Un interrupteur peut être adapté pour activer l'amortisseur de bruit.
- Cet interrupteur peut être adapté pour être commandé par le mouvement du châssis ouvrant de sorte que lorsque ledit châssis ouvrant passe de la position fermée à la position ouverte intermédiaire, ledit interrupteur active automatiquement l'amortisseur de bruit.
- L'interrupteur peut également être adapté pour désactiver automatiquement l'amortisseur de bruit lorsque le châssis ouvrant est dans la position fermée.
- Le microphone est préférentiellement installé sur le même profilé que celui dans lequel est installé le haut-parleur, ledit microphone étant adjacent audit haut-parleur.
- Le microphone peut être un microphone de contrôle connecté à une électronique de contrôle, cette dernière étant adaptée pour contrôler le haut-parleur en fonction des signaux acoustiques captés par le microphone de contrôle, laquelle électronique de contrôle comprend un moyen de filtrage par rétroaction possédant une entrée reliée au microphone de contrôle et une sortie reliée au haut-parleur.
- Le microphone de contrôle est avantageusement décalé du plan médian longitudinal du profilé sur lequel il est installé, à l'opposé de la source de bruit à atténuer.
- Le microphone de contrôle est avantageusement orienté dans une direction qui est perpendiculaire à la direction de propagation, dans le passage de ventilation, des signaux acoustiques provenant de la source de bruit à atténuer.
- Au moins un microphone de référence peut être installé en dehors du passage de ventilation, lequel microphone est orienté vers la source de bruit, l'électronique de contrôle comprenant un moyen de filtrage par anticipation, possédant une entrée (reliée au microphone de référence et une sortie reliée au haut-parleur.
- Le microphone de contrôle et le microphone de référence sont avantageusement portés par le même profilé ou sont portés chacun par un profilé distinct.
- Avantageusement, l'électronique de contrôle comprend un moyen sommateur possédant une première entrée, une seconde entrée et une sortie reliée au haut-parleur ; le moyen de filtrage par rétroaction comprend une entrée reliée au microphone de contrôle et une sortie reliée à la première entrée du moyen sommateur ; le moyen de filtrage par anticipation comprend une entrée reliée au microphone de référence et une sortie reliée à la seconde entrée du moyen sommateur.
- Le moyen de filtrage par anticipation est préférentiellement du type adaptatif et comprend : - une première entrée reliée au microphone de contrôle ; - une seconde entrée reliée au microphone de référence.
- Le haut-parleur peut être un haut parleur circulaire ou un haut-parleur linéaire.
- The first sections are advantageously vertical sections.
- The sound absorber can be directly installed in the first profile of the fixed frame; the first corresponding section of the opening frame having a face which is located opposite the sound absorber, which face is coated with a sound-insulating material.
- In an alternative embodiment, the noise damper can be directly installed in the first section of the opening frame; the corresponding first section of the fixed frame having a face which is located opposite the sound absorber, which face is coated with a sound-insulating material.
- The noise damper advantageously comprises at least one microphone arranged to pick up noise in the ventilation passage and at least one loudspeaker adapted to generate counter noise in the ventilation passage in response to the noise picked up by the microphone.
- A switch can be adapted to activate the sound absorber.
- This switch can be adapted to be controlled by the movement of the opening frame so that when said opening frame moves from the position closed to the intermediate open position, said switch automatically activates the noise damper.
- The switch can also be adapted to automatically deactivate the sound absorber when the opening frame is in the closed position.
- The microphone is preferably installed on the same profile as that in which the loudspeaker is installed, said microphone being adjacent to said loudspeaker.
- The microphone may be a control microphone connected to control electronics, the latter being adapted to control the loudspeaker as a function of the acoustic signals picked up by the control microphone, which control electronics comprises feedback filtering means having a input connected to the monitoring microphone and an output connected to the loudspeaker.
- The monitoring microphone is advantageously offset from the longitudinal median plane of the section on which it is installed, opposite the source of noise to be attenuated.
- The monitoring microphone is advantageously oriented in a direction which is perpendicular to the direction of propagation, in the ventilation passage, of the acoustic signals coming from the noise source to be attenuated.
- At least one reference microphone can be installed outside the ventilation passage, which microphone is directed towards the noise source, the control electronics comprising a feed-forward filtering means, having an input (connected to the reference microphone and a output connected to the loudspeaker.
- The control microphone and the reference microphone are advantageously carried by the same section or are each carried by a separate section.
- Advantageously, the control electronics comprise summing means having a first input, a second input and an output connected to the loudspeaker; the feedback filter means comprises an input connected to the monitoring microphone and an output connected to the first input of the summing medium; the anticipatory filtering means comprises an input connected to the reference microphone and an output connected to the second input of the summing means.
- The anticipatory filtering means is preferably of the adaptive type and comprises: a first input connected to the monitoring microphone; - a second input connected to the reference microphone.
- The loudspeaker can be a circular loudspeaker or a linear loudspeaker.
D'autres avantages et caractéristiques de l'invention apparaîtront mieux à la lecture de la description d'un mode de réalisation préféré qui va suivre, en référence aux dessins annexés, réalisés à titre d'exemples indicatifs et non limitatifs et sur lesquels :
- la
figure 1 est une vue schématique de face, depuis l'extérieur du local, d'une installation conforme à l'invention selon un premier mode de réalisation, la fenêtre étant en position fermée, - la
figure 2 est une vue schématique en coupe selon A-A de l'installation de lafigure 1 , - la
figure 3 est une vue schématique de face, depuis l'extérieur du local, de l'installation selon le premier mode de réalisation, la fenêtre étant en position ouverte intermédiaire, - la
figure 4 est une vue schématique en coupe selon B-B de l'installation de lafigure 3 , - la
figure 5 est une vue schématique en coupe transversale d'une installation conforme à l'invention selon un second mode de réalisation, la fenêtre étant en position fermée, - la
figure 6 montre l'installation de lafigure 5 avec la fenêtre en position ouverte intermédiaire, - la
figure 7 illustre un exemple de réalisation et d'agencement d'un amortisseur de bruit actif, - la
figure 8 illustre un autre exemple de réalisation et d'agencement d'un amortisseur de bruit actif, - la
figure 9 illustre encore un exemple de réalisation et d'agencement d'un amortisseur de bruit actif. - la
figure 10 illustre un exemple de réalisation et d'agencement d'un amortisseur de bruit passif.
- the
figure 1 is a schematic front view, from outside the room, of an installation according to the invention according to a first embodiment, the window being in the closed position, - the
figure 2 is a schematic sectional view along AA of the installation of thefigure 1 , - the
figure 3 is a schematic front view, from outside the room, of the installation according to the first embodiment, the window being in the intermediate open position, - the
figure 4 is a schematic sectional view along BB of the installation of thefigure 3 , - the
figure 5 is a schematic cross-sectional view of an installation according to the invention according to a second embodiment, the window being in the closed position, - the
figure 6 shows the installation of thefigure 5 with the window in the intermediate open position, - the
figure 7 illustrates an exemplary embodiment and arrangement of an active noise damper, - the
figure 8 illustrates another embodiment and arrangement of an active noise damper, - the
figure 9 further illustrates an exemplary embodiment and arrangement of an active noise damper. - the
figure 10 illustrates an exemplary embodiment and arrangement of a passive noise damper.
La présente invention concerne une installation pour la ventilation naturelle d'un local, qui se caractérise par une conception particulière du passage de ventilation et de l'amortisseur de bruit qu'elle comporte.The present invention relates to an installation for the natural ventilation of a room, which is characterized by a particular design of the ventilation passage and of the noise damper that it comprises.
En se rapportant aux
Au moins une porte ou une fenêtre F est installée dans une des parois P du local L. Pour simplifier la compréhension de l'invention, la suite de la description ne fait état que d'une fenêtre F.At least one door or a window F is installed in one of the walls P of the room L. To simplify the understanding of the invention, the remainder of the description only mentions one window F.
Cette fenêtre F est préférentiellement une fenêtre multi-vitrage, par exemple double vitrage, mais peut être à simple vitrage. Elle forme une interface entre l'intérieur du local L et l'extérieur dudit local.This window F is preferably a multi-glazed window, for example double glazing, but can be single-glazed. It forms an interface between the interior of the room L and the exterior of said room.
La fenêtre F en elle-même est du type connu. Elle se compose d'un ou plusieurs vantaux V, V' comme illustré sur la
Les châssis ouvrants 30, 30' sont montés mobiles dans un châssis dormant 31 (simplement dénommé « dormant » en menuiserie) fixé à la paroi P. Ce châssis dormant 31 est solidaire de la paroi P et plus généralement du gros œuvre ou du bâti de l'ensemble où doit être disposée la fenêtre F. Il est également formé par des profilés horizontaux 31a et verticaux 31b1, 31b2 encadrant les châssis ouvrants 30, 30'.The opening frames 30, 30 'are movably mounted in a fixed frame 31 (simply called "frame" in carpentry) fixed to the wall P. This fixed
Dans le cas où l'ouvrant est formé de deux vantaux V, V', les dimensions des châssis ouvrants 30, 30' en largeur sont sensiblement égales à la moitié de celles du châssis dormant 31 qui les entoure. Leurs dimensions en hauteur sont sensiblement égales à celle du châssis dormant 31, aux épaisseurs des profilés près. A titre d'exemple illustratif seulement, les châssis ouvrants 30, 30' ont une largeur de 1,5 m et une hauteur de 2,5 m.In the case where the opening is formed of two leaves V, V ', the dimensions of the opening frames 30, 30' in width are substantially equal to half those of the fixed
Les profilés 30a, 30'a, 30b1, 30b2, 30'b1, 30'b2, 31a, 31b1, 31b2 sont rigides, réalisés en métal tel que l'aluminium ou autre, en bois, en matière plastique, voire en combinant de tels matériaux.The
Sur les
De manière classique, le châssis ouvrant 30 est mobile entre une position fermée (
En position fermée, le profilé vertical 30b1 latéral du châssis ouvrant 30 pénètre dans le profilé vertical 31b1 correspondant du châssis dormant 31, ces deux profilés se solidarisant hermétiquement. Préférentiellement, ces deux profilés 30b1, 31b1 comprennent des moyens de verrouillage mutuels pour bloquer le vantail V dans cette position. Typiquement, dans la position fermée, aucune ventilation entre l'intérieur et l'extérieur E du local L, n'est possible par la fenêtre F.In the closed position, the lateral vertical profile 30b1 of the
Dans la position ouverte, le profilé vertical 30b1 latéral du châssis ouvrant 30 se désolidarise du profilé vertical 31b1 correspondant du châssis dormant 31, et s'écarte de ce dernier. Une ventilation naturelle est possible entre l'intérieur et l'extérieur E du local L, par la fenêtre F.In the open position, the lateral vertical section 30b1 of the
Dans une position ouverte intermédiaire (
Dans cette position ouverte intermédiaire, le passage de ventilation 1 est formé. Il est délimité par l'espace séparant le profilé vertical 30b1 latéral du châssis ouvrant 30 du profilé vertical 31b1 correspondant du châssis dormant 31 lorsque ledit châssis ouvrant 30 est dans la position ouverte intermédiaire. Le passage 1 communique entre l'extérieur E du local L et l'intérieur dudit local de manière à permettre une ventilation naturelle entre l'extérieur E et l'intérieur dudit local, sur toute la hauteur de la fenêtre F. Cette ventilation naturelle est schématisée sur les
La largeur du passage de ventilation 1 correspond à la distance de coulissement du vantail V de la position fermée jusqu'à la position ouverte intermédiaire, par exemple entre 2 cm et 15 cm, préférentiellement 10 cm. En position fermée, le passage de ventilation 1 a une épaisseur nulle. Toute ventilation entre l'intérieur et l'extérieur E du local L par le passage de ventilation 1 est interdite.The width of the
Etant donné que le passage de ventilation 1 est délimité par les profilés 30b1 et 31b1, il n'est pas nécessaire de rajouter un accessoire supplémentaire susceptible de réduire la surface vitrée totale de la fenêtre F et l'éclairement du local L. Grâce à l'invention, cette surface vitrée totale et cet éclairement sont intégralement préservés.Since the
Pour que l'utilisateur puisse facilement atteindre la position ouverte intermédiaire sans ouvrir davantage le vantail V, on prévoit avantageusement d'installer dans le rail 31c, un élément 310c formant butée lorsque le châssis ouvrant 30 est dans la position ouverte intermédiaire. Cet élément 310c est clairement visible sur les
Un amortisseur de bruit actif 2 est associé au passage de ventilation 1. Cet amortisseur est utilisé pour un contrôle actif ou passif du bruit. Il est directement intégré dans l'un des profilés 30b1 ou 31b1 précité.An
Dans le mode de réalisation des
Un amortisseur 2 actif génère, dans le passage de ventilation 1, un niveau sonore équivalent au niveau sonore ambiant à contrôler, notamment un bruit provenant d'une source de bruit située à l'extérieur E du local L. En pratique, cet amortisseur 2 actif génère un contre bruit qui se superpose aux ondes sonores se propageant dans le passage de ventilation 1.An
L'amortisseur de bruit 2 actif peut se présenter sous la forme d'un actionneur piézo-électrique ou d'un haut-parleur. On utilise préférentiellement un haut-parleur linéaire du type décrit dans le document brevet
Le haut parleur linéaire peut toutefois être remplacé par plusieurs haut-parleurs circulaires 22 installés côte-à-côte sur toute la longueur du profilé 30b1 ou 31b1 comme illustré sur les
On utilise dans la suite de la description le terme générique de haut-parleur, portant la référence 22, que ce dernier soit un haut-parleur en tant que tel (linéaire ou circulaire) ou un actionneur piézo-électrique.The generic term loudspeaker is used in the remainder of the description, bearing the
L'amortisseur de bruit 2 peut comprendre un seul haut-parleur linéaire ou plusieurs haut-parleurs circulaires 22 disposés le long du profilé 30b1 ou 31b1. Une intégration dans le châssis dormant 31 permet de simplifier la conception de l'amortisseur 2 et son câblage, Le choix du nombre de haut-parleurs et de leur agencement dépend du champ sonore à atténuer, par superposition, des bruits se propageant dans le passage de ventilation 1, pour augmenter l'isolation phonique dès lors que la fenêtre est en position ouverte intermédiaire.The
Sur la
Au moins un microphone 21 est installé dans le passage de ventilation 1 pour capter les signaux acoustiques se propageant dans ce dernier. A titre d'exemple on peut utiliser un microphone de la marque PUI Audio portant la référence POM-2246L-C33-R et fabriqué par la société PUI Audio.At least one
Le microphone 21 envoie un signal représentatif du bruit dans le passage de ventilation 1 à une électronique de contrôle 23. Dès lors, l'électronique de contrôle 23 émet un signal de commande à l'actionneur 221 en fonction des signaux acoustiques captés par le microphone 21. L'amortisseur 2 permet ainsi d'augmenter l'isolation phonique de la fenêtre F alors qu'elle est dans la position ouverte intermédiaire.The
Le microphone 21 est avantageusement un microphone de contrôle connecté à l'électronique de contrôle 23. Ce microphone de contrôle 21 est installé dans le passage de ventilation 1 de sorte qu'il soit le plus éloigné possible de la source de bruit S. De manière générale, le microphone de contrôle 21 est décalé du plan médian longitudinal MP du profilé 30b1, 31b1 sur lequel il est installé, à l'opposé de la source de bruit S à atténuer. Dans l'exemple des
Grâce à cette position du microphone de contrôle 21, la demanderesse a pu constater de manière surprenante que l'atténuation du bruit était efficace et stable, dans une bande de fréquences relativement large de 0 Hz à 650 Hz, et plus particulièrement de 70 Hz à 650 Hz.Thanks to this position of the
De bons résultats sont obtenus lorsque le microphone de contrôle 21 est orienté dans une direction qui est perpendiculaire à la direction de propagation, dans le passage de ventilation 1, des signaux acoustiques provenant de la source de bruit S. Le microphone de contrôle 21 est ainsi orienté dans une direction qui est parallèle à la direction de déplacement du vantail V, c'est-à-dire parallèle au plan médian longitudinal MP. Dans cette disposition, il apparait que le microphone de contrôle 21 recueille de manière satisfaisante le signal acoustique résiduel qui est utilisé comme signal d'erreur dans le filtrage par rétroaction décrit ci-après dans la description. Ce signal acoustique résiduel est une combinaison du bruit résiduel atteignant l'intérieur du local L et d'un contre bruit généré par le haut-parleur 22 qui est idéalement la copie inversée du bruit à supprimer issu de la source S.Good results are obtained when the
Sur les
Le microphone de contrôle 21 peut toutefois être installé dans le passage de ventilation 1, sur un autre profilé qui est distant du profilé 30b1, 31b1 dans lequel est installé le haut-parleur 22. Le microphone de contrôle 21 peut par exemple être agencé sur le profilé 30b1 du châssis ouvrant 30 qui est à l'opposé du profilé 31b1 du châssis dormant 31 dans lequel est installé le haut parleur 22. La configuration inverse étant bien entendu envisageable. Le microphone de contrôle 21 peut encore être installé sur l'un des profilés horizontaux 31a du châssis dormant, dans le passage de ventilation 1, alors que le haut parleur 22 est installé sur l'un des profilés verticaux 30b1 ou 30b2, et inversement.The
Sur la
La technique d'atténuation active par rétroaction est fondée sur une boucle de contre-réaction agencée pour engendrer une atténuation active des ondes sonores se propageant dans le passage de ventilation 1. Le signal mesuré par le microphone de contrôle 21 est injecté à l'actionneur 221 à travers le moyen de filtrage par rétroaction FB qui corrige ledit signal pour tenter d'annuler son énergie. Cette technique rétroactive permet d'obtenir une atténuation acoustique avec un certain gain, sans engendrer d'instabilité dans une bande de fréquences de traitement. Le plus souvent, cette bande de fréquences de traitement correspond à des basses fréquences, par exemple en ondes sonores à la bande de fréquences allant de 0 à 400 Hz et plus particulièrement de 70 Hz à 400 Hz.The feedback active attenuation technique is based on a feedback loop arranged to generate active attenuation of the sound waves propagating in the
L'électronique de contrôle 23 comprend avantageusement : - des moyens de pré-amplification comprenant une entrée reliée au microphone de contrôle 21 et une sortie reliée à l'entrée FBe du moyen de filtrage par rétroaction FB ; - et des moyens d'amplification comprenant une entrée reliée à la sortie FBs du moyen de filtrage par rétroaction FB, et une sortie reliée à l'actionneur 221.The
Cette électronique de contrôle 23 constitue ici une boucle de contre-réaction agencée pour engendrer une atténuation acoustique active sans engendrer d'instabilité dans une bande de fréquences choisie. Par exemple, la bande de fréquences dans laquelle le moyen de filtrage par rétroaction FB est efficace sans engendrer d'instabilité au sens de Nyquist, est de l'ordre de 0 à 650 Hz pour des ondes sonores, et plus particulièrement de 70 Hz à 650 Hz.This
En pratique, le moyen de filtrage par rétroaction FB comprend une pluralité de filtres analogiques actifs d'ordre supérieur ou égal à 1, agencés pour engendrer une fonction de transfert permettant d'éviter des instabilités dans la bande de fréquence 0-650 Hz au sens de Nyquist, plus particulièrement dans la bande 70-650 Hz, et la fonction de transfert du moyen de filtrage FB est déterminée de telle sorte que la phase de ladite fonction de transfert ne passe pas par la valeur 0 dans la bande 0-600 Hz, et plus particulièrement la bande 70-600 Hz.In practice, the feedback filtering means FB comprises a plurality of active analog filters of order greater than or equal to 1, arranged to generate a transfer function making it possible to avoid instabilities in the frequency band 0-650 Hz in the sense of Nyquist, more particularly in the 70-650 Hz band, and the transfer function of the filtering means FB is determined such that the phase of said transfer function does not pass through the
Cependant, un effet de pompage apparaît au-delà de 650 Hz qui se traduit par une augmentation du niveau de bruit par rapport à l'action des moyens d'atténuation passive seule, c'est-à-dire le panneau 4 seul. Ce phénomène est tout à fait connu de l'homme du métier, et constitue une non-linéarité (dégradations des performances) par rapport aux résultats attendus de l'observation du système en boucle ouverte.However, a pumping effect appears above 650 Hz which results in an increase in the noise level compared to the action of the passive attenuation means alone, that is to say the
Pour remédier à cela, il est avantageux de combiner l'atténuation active par rétroaction à une atténuation active par anticipation. Sur la
A titre d'exemple on peut utiliser un microphone de référence 25 de la marque PUI Audio portant la référence POM-2246L-C33-R et fabriqué par la société PUI Audio.By way of example, it is possible to use a
Dans cette technique d'atténuation active par anticipation, un champ acoustique de référence, en amont de la propagation du champ acoustique dans le passage de ventilation 1, est détecté par le microphone de référence 25, puis traité par le moyen de filtrage FF afin de déterminer la commande à appliquer à l'actionneur 221.In this active attenuation technique by anticipation, a reference acoustic field, upstream of the propagation of the acoustic field in the
Pour optimiser le traitement des signaux, on prévoit : - des moyens de pré-amplification comprenant une entrée reliée au microphone de référence 25 et une sortie reliée à l'entrée FFe du moyen de filtrage par anticipation FF ; - et des moyens d'amplification comprenant une entrée reliée à la sortie FFs du moyen de filtrage par anticipation FF, et une sortie reliée à l'actionneur 221.To optimize the processing of the signals, the following are provided: pre-amplification means comprising an input connected to the
Sur la
La technique par anticipation est articulée autour du moyen de filtrage par anticipation FF de type non adaptatif ou adaptatif. Comparé à un filtrage non adaptatif, le filtrage adaptatif est plus efficace sur le plan de l'atténuation du bruit, mais nécessite une puissance de calcul plus importante et un coût de réalisation plus élevé.The anticipation technique is articulated around the anticipatory filtering means FF of the non-adaptive or adaptive type. Compared to non-adaptive filtering, adaptive filtering is more efficient in terms of noise attenuation, but requires more computing power and higher production cost.
Dans le cas où le moyen de filtrage par anticipation FF est du type non adaptatif, sa fonction de transfert est une fonction fixe qui est préréglée et qui ne varie pas.In the case where the anticipatory filtering means FF is of the non-adaptive type, its transfer function is a fixed function which is preset and which does not vary.
Avec un moyen de filtrage par anticipation FF adaptatif, la fonction de transfert est modifiée dynamiquement, en continu, par un algorithme d'analyse en temps réel du signal acoustique provenant de la source S. Les coefficients du moyen de filtrage par anticipation FF sont adaptés en temps réel selon un algorithme choisi de façon à minimiser l'énergie des vibrations captées par le microphone de contrôle 21 en fonction de l'énergie des vibrations de référence captées par le microphone de référence 25.With an adaptive FF feed-forward filtering means, the transfer function is modified dynamically, continuously, by an algorithm for real-time analysis of the acoustic signal coming from the source S. The coefficients of the FF feed-forward filtering means are adapted. in real time according to an algorithm chosen so as to minimize the energy of the vibrations picked up by the
Ce filtrage adaptatif est schématisé sur la
Dans une étape préalable d'initialisation la fonction de transfert du chemin dit secondaire entre le haut-parleur 22 et le microphone de contrôle 21 est mesurée, échantillonnée et sauvegardée dans la mémoire d'un processeur de l'électronique de contrôle 23. Cette fonction de transfert ainsi préalablement mesurée va servir ensuite dans la phase de calibration pour l'adaptation des éléments de filtrage par anticipation. Cette étape est réalisée d'une manière connue de l'homme du métier.In a preliminary initialization step, the transfer function of the so-called secondary path between the
L'atténuation active de type "hybride" obtenue selon l'invention résulte d'une combinaison des moyens de filtrage par anticipation et par rétroaction dans laquelle le filtrage par anticipation est greffé sur le filtrage par rétroaction ou réciproquement. Cela permet de linéariser l'atténuation rétroactive dans toute une bande de fréquences plus large que la bande de fréquences (0-650 Hz, et plus particulièrement 70-650 Hz) traitée directement par le moyen de filtrage par rétroaction FB, d'accélérer la convergence de l'algorithme de minimisation, et d'améliorer la robustesse du moyen de filtrage par anticipation FF. On améliore ainsi le gain d'atténuation active dans une bande élargie qui peut aller jusqu'à 4000 Hz, par suppression de l'effet de pompage mentionné précédemment.The active attenuation of the “hybrid” type obtained according to the invention results from a combination of the anticipation and feedback filtering means in which the anticipation filtering is grafted onto the feedback filtering or vice versa. This makes it possible to linearize the feedback attenuation in a whole frequency band wider than the frequency band (0-650 Hz, and more particularly 70-650 Hz) processed directly by the means of feedback filtering FB, to accelerate the convergence of the minimization algorithm, and to improve the robustness of the feedforward filtering means FF. This improves the gain of active attenuation in a widened band which can go up to 4000 Hz, by eliminating the pumping effect mentioned above.
Sur les
De bons résultats sont obtenus lorsque le microphone de référence 25 est orienté dans une direction qui est parallèle à la direction de propagation des signaux acoustiques provenant de la source de bruit S. Le microphone de référence 25 est ainsi orienté dans une direction qui est perpendiculaire à la direction de déplacement de la membrane 220, c'est-à-dire perpendiculaire au plan médian longitudinal MP du profilé 30b1, 31b1. Dans cette disposition, il apparait que le microphone de référence 25 recueille de manière satisfaisante le signal acoustique provenant de la source de bruit S, sans être perturbé par le contre bruit généré par le haut-parleur 22.Good results are obtained when the
Pour simplifier la conception de l'amortisseur de bruit 2, le microphone de référence 25 et le microphone de contrôle 21 sont portés par le même profilé 30b1, 31b1. On peut toutefois prévoir que le microphone de contrôle 21 et le microphone de référence 25 soient portés chacun par un profilé distinct. Le microphone de référence 25 peut par exemple être agencé sur le profilé 30b1 du châssis ouvrant 30 qui est à l'opposé du profilé vertical 31b1 dans lequel sont installés le haut parleur 22 et le microphone de contrôle 21. Il peut également être installé sur l'un des profilés horizontaux 31a du châssis dormant 31, alors que le haut parleur 22 et le microphone de contrôle 21 sont installés sur l'un des profilés 30b1, 31b1, et inversement.To simplify the design of the
D'autres montages sont envisageables comme ceux décrits dans le brevet européen
Il n'est pas nécessaire que l'amortisseur de bruit 2 soit activé lorsque la fenêtre F est dans la position fermée. A cet effet, un interrupteur est adapté pour activer l'amortisseur de bruit 2. Sur les
Dans une variante de réalisation, on prévoit que l'interrupteur soit commandé par le mouvement de la fenêtre F de sorte que lorsque ladite fenêtre passe de la position fermée à la position ouverte intermédiaire, ledit interrupteur active automatiquement l'amortisseur de bruit 2 actif. A cet effet, un capteur de position peut être installé dans le rail 31c. Lorsque la fenêtre F est dans la position ouverte intermédiaire, le capteur de position coopère avec l'interrupteur pour que ce dernier active automatiquement l'amortisseur de bruit 2 actif. Cet interrupteur peut également être adapté pour désactiver automatiquement l'amortisseur de bruit 2 actif lorsque la fenêtre F est dans la position fermée ou qu'elle n'est pas dans la position ouverte intermédiaire.In an alternative embodiment, provision is made for the switch to be controlled by the movement of the window F so that when said window passes from the closed position to the intermediate open position, said switch automatically activates the
L'amortisseur 2 peut également être passif, c'est-à-dire qu'il est adapté pour absorber tout ou partie des ondes sonores se propageant dans le passage de ventilation 1. Pour ce faire, les faces des profilés 30b1, 31b1, 31a qui sont situées dans le passage de ventilation 1 et qui délimitent ledit passage sur ces quatre côtés, peuvent être recouvertes partiellement ou totalement d'un matériau isolant phonique. Sur les
Pour améliorer davantage la réduction du bruit dans le passage de ventilation 1, il est avantageux de combiner une atténuation active par l'usage de l'amortisseur actif 2 et une atténuation passive par le revêtement 13.To further improve the reduction of noise in the
Sur la
L'agencement des différents éléments et/ou moyens et/ou étapes de l'invention, dans les modes de réalisation décrits ci-dessus, ne doit pas être compris comme exigeant un tel agencement dans toutes les implémentations. En tout état de cause, on comprendra que diverses modifications peuvent être apportées à ces éléments et/ou moyens et/ou étapes, sans s'écarter de l'invention telle que définie dans les revendications. En particulier :
- Le local L peut être un habitacle particulier, tel que l'habitacle d'un véhicule automobile, d'un train, voire d'un aéronef. Les parois P sont alors par exemple constituées de tôles.
- La fenêtre F peut comprendre un seul vantail V formé par le châssis ouvrant 30 monté mobile dans le châssis dormant 31, ou plus de deux vantaux.
- Les deux vantaux V, V' peuvent être susceptibles de se déplacer en glissant latéralement dans des plans parallèles sur des rails porteurs horizontaux montés à la partie inférieure du châssis
dormant fixe 31. - Le vantail V peut se déplacer en glissant verticalement sur un ou plusieurs rails porteurs verticaux montés dans la partie latérale du châssis dormant 31, et notamment dans les profilés verticaux 31b.
- Les châssis 30
et 31 sont préférentiellement de forme rectangulaire ou carrée, mais peuvent être de forme polygonale, avoir un ou plusieurs bords incurvés, etc. - La ventilation naturelle dans le
passage 1 peut se faire de l'extérieur du local L vers l'extérieur E ; ou de l'intérieur du local L vers l'extérieur E. L'élément 310c formant butée peut se présenter sous toute autre forme convenant à l'homme du métier.- Le passage de
ventilation 1 et l'amortisseur de bruit 2 peuvent être associés à une fenêtre oscillante où le châssis ouvrant 30 est monté mobile en rotation dans le châssis dormant 31. - Le filtre par rétroaction FEEDBACK peut être adaptatif, en utilisant par exemple un algorithme de type IMC-FXLMS pour « Internai Model Control Filtered-X Least Mean Squares ».
- Concernant les algorithmes de contrôle en mode FEEDBACK et/ou FEEDFORWARD, le traitement peut être soit analogique soit numérique.
- Le filtre par anticipation FEEDFORWARD peut être utilisé seul, sans filtre par rétroaction FEEDBACK.
- The room L can be a particular passenger compartment, such as the passenger compartment of a motor vehicle, of a train, or even of an aircraft. The walls P are then for example made of sheets.
- The window F can comprise a single leaf V formed by the
opening frame 30 movably mounted in the fixedframe 31, or more than two leaves. - The two leaves V, V 'may be able to move by sliding laterally in parallel planes on horizontal support rails mounted on the lower part of the fixed fixed
frame 31. - The leaf V can move by sliding vertically on one or more vertical support rails mounted in the lateral part of the fixed
frame 31, and in particular in the vertical profiles 31b. - The
30 and 31 are preferably of rectangular or square shape, but may be of polygonal shape, have one or more curved edges, etc.frames - Natural ventilation in
passage 1 can be done from outside room L to outside E; or from inside room L to outside E. - The
element 310c forming a stopper can be in any other form suitable for those skilled in the art. - The
ventilation passage 1 and thenoise damper 2 can be associated with an oscillating window where theopening frame 30 is mounted so as to be able to rotate in the fixedframe 31. - The FEEDBACK feedback filter can be adaptive, using for example an algorithm of the IMC-FXLMS type for “Internai Model Control Filtered-X Least Mean Squares”.
- Regarding the control algorithms in FEEDBACK and / or FEEDFORWARD mode, the processing can be either analog or digital.
- The FEEDFORWARD feed-forward filter can be used alone, without a FEEDBACK feed-back filter.
Claims (17)
- Apparatus for natural ventilation of a room, said apparatus comprising:- a room (L) delimited by walls (P),- at least one door or one window (F) installed in one of the room (L) walls (P) and comprises an opening frame (30) produced from profiles (30a, 30b1, 30b2) supporting at least one glass panel (4), which opening frame (30) is mounted so as to move in a fixed stationary frame (31) formed by profiles (31a, 31b) surrounding said opening frame (30),- a ventilation passage (1) which communicates between the outside (E) of the room and the inside of the room (L) in such a way as to allow natural ventilation between the outside (E) and inside of said room,- a noise absorber (2) capable of attenuating sound waves propagating in the ventilation passage (1), said attenuation being realized by the generation of a counter-noise which is superimposed on said sound waves,- the opening frame (30) is mounted movably in the stationary frame (31) between a closed position wherein a first profile (30b1) of the opening frame (30) is attached to the first corresponding profile (31b1) of the stationary frame (31) and an open position wherein the first profile (30b1) of the opening frame (30) is separated from the first profile (31b1) of the stationary frame (31),
wherein,- in an intermediate open position of the opening frame (30), the first profile (30b1) of the opening frame (30) is separated from the first profile (31b1) of the stationary frame (31) by a predetermined distance,- the ventilation passage (1) is delimited by the space separating the first profile (30b1) of the opening frame (30) from the first profile (31b1) of the stationary frame (31) when said opening frame (30) is in the intermediate open position,- the noise absorber (2) is directly installed in the first profile (30b1) of the opening frame (30) and/or in the first profile (31b1) of the stationary frame (31),- when the opening frame (30) is in the closed position, the first profiles (30b1, 31b1) are attached together in such a way that the ventilation passage (1) is hermetically closed, with any ventilation between the inside and outside (E) of the room (L) by said ventilation passage (1) being prevented. - Installation according to claim 1, wherein the first profiles (30b1, 31b1) are vertical profiles.
- Installation according to one of claims 1 or 2, wherein:- the noise absorber (2) is directly installed in the first profile (31b1) of the stationary frame (31),- the first corresponding profile (30b1) of the opening frame (30) has a face which is located facing the noise absorber (2), which face is covered with a sound-insulating material (13).
- Installation according to one of claims 1 or 2, wherein:- the noise absorber (2) is directly installed in the first profile (30b1) of the opening frame (30),- the first corresponding profile (31b1) of the stationary frame (31) has a face which is located facing the noise absorber (2), which face is covered with a sound-insulating material (13).
- Installation according to one of claims 1 to 4, wherein the noise absorber (2) comprises at least one microphone (21) arranged to sense the noise in the ventilation passage (1) and at least one loudspeaker (22) adapted to generate a counter-noise in the ventilation passage (1) in response to the noise sensed by the microphone (21).
- Installation according to claim 5, wherein a switch (5) is adapted to activate the noise absorber (2).
- Installation according to claim 6, wherein the switch is adapted to be controlled by the movement of the opening frame (30) in such a way that when said opening frame passes from the closed position to the intermediate open position, said switch (5) automatically activates the noise absorber (2).
- Installation according to one of claims 6 or 7, wherein the switch is adapted to automatically deactivate the noise absorber (2) when the opening frame (30) is in the closed position.
- Installation according to one of claims 5 to 8, wherein the microphone (21) is installed on the same profile (30b1, 31b1) as the one in which the loudspeaker (22) is installed, said microphone (21) being adjacent to said loudspeaker (22).
- Installation according to one of claims 5 to 9, wherein:- the microphone (21) is a control microphone connected to a control electronics (23),- the control electronics (23) is adapted to control the loudspeaker (22) according to the acoustic signals sensed by the control microphone (21), which control electronics (23) comprises a means of filtering via feedback (FB) having an input (FBe) connected to the control microphone (21) and an output (FBs) connected to the loudspeaker (22).
- Installation according to one of claims 9 or 10, wherein the control microphone (21) is offset from the longitudinal median plane (MP) of the profile (30b1, 31b1) whereon it is installed, opposite the noise source (S) to be attenuated.
- Installation according to one of claims 9 to 11, wherein the control microphone (21) is oriented in a direction that is perpendicular to the direction of propagation, in the ventilation passage (1), of the acoustic signals coming from the noise source (S) to be attenuated.
- Installation according to one of claims 5 to 12, wherein:- at least one reference microphone (25) is installed outside of the ventilation passage (1), which microphone is oriented towards the noise source (S),- the control electronics (23) comprise a means of filtering via feedforward (FF), having an input (FFe) connected to the reference microphone (25) and an output (FFs) connected to the loudspeaker (22).
- Installation according to claim 13 taken in combination with claim 11, wherein the control microphone (21) and the reference microphone (25) are carried by the same profile (30b1, 31b1) or are each carried by a separate profile (30b1, 31b1).
- Installation according to one of claims 13 or 14 taken in combination with claim 11, wherein:- the control electronics (23) comprises a summing means (24) having a first input (24e1), a second input (24e2) and an output (24s) connected to the loudspeaker (22),- the means of filtering via feedback (FB) comprises an input (FBe) connected to the control microphone (21) and an output (FBs) connected to the first input (24e1) of the summing means (24),- the means of filtering via feedforward (FF) comprises an input (FFe) connected to the reference microphone (25) and an output (FFs) connected to the second input (24e2) of the summing means (24).
- Installation according to one of claims 13 to 15, wherein the means of filtering via feedforward (FF) is of the adaptive type and comprises:- a first input (FFe1) connected to the control microphone (21),- a second input (FFe2) connected to the reference microphone (25).
- Installation according to one of claims 1 to 16, wherein the loudspeaker (22) is a circular loudspeaker or a linear loudspeaker.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1560495A FR3043179A1 (en) | 2015-11-02 | 2015-11-02 | INSTALLATION FOR THE NATURAL VENTILATION OF A LOCAL HAVING A VENTILATION PASSAGE ASSOCIATED WITH A NOISE DAMPER |
PCT/FR2016/052836 WO2017077233A1 (en) | 2015-11-02 | 2016-11-02 | Apparatus for natural ventilation of a room having a ventilation passage combined with a noise absorber |
Publications (2)
Publication Number | Publication Date |
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EP3371521A1 EP3371521A1 (en) | 2018-09-12 |
EP3371521B1 true EP3371521B1 (en) | 2021-06-09 |
Family
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Application Number | Title | Priority Date | Filing Date |
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EP16809959.6A Active EP3371521B1 (en) | 2015-11-02 | 2016-11-02 | Apparatus for natural ventilation of a room having a ventilation passage combined with a noise absorber |
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US (1) | US20180320922A1 (en) |
EP (1) | EP3371521B1 (en) |
FR (1) | FR3043179A1 (en) |
WO (1) | WO2017077233A1 (en) |
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FR3035432A1 (en) * | 2015-04-21 | 2016-10-28 | Sapa Building Systems France | WINDOW COMPRISING AN ACOUSTIC DAMPING DEVICE |
CN107507608A (en) * | 2017-09-08 | 2017-12-22 | 肇庆高新区恒泰信息服务有限公司 | Denoising device in a kind of smart home room |
DE102019209438B4 (en) * | 2019-06-28 | 2022-01-13 | Audi Ag | Motor vehicle with a system for reducing a sound pressure level in a motor vehicle interior and method for reducing the sound pressure level |
Family Cites Families (12)
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US5000079A (en) * | 1990-05-17 | 1991-03-19 | Mardis Michael C | Noise-attenuating ventilation pedestal for an electronic enclosure |
WO1992014023A2 (en) * | 1991-01-23 | 1992-08-20 | Cox Marcus C | Sound deadening window ventilation apparatus |
WO1997043754A1 (en) | 1996-05-14 | 1997-11-20 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Reactive sound absorber |
FR2766650A1 (en) | 1997-07-23 | 1999-01-29 | Technofirst | LINEAR SPEAKER |
DE19861018C2 (en) | 1998-12-15 | 2001-06-13 | Fraunhofer Ges Forschung | Controlled acoustic waveguide for sound absorption |
GB9920883D0 (en) * | 1999-09-03 | 1999-11-10 | Titon Hardware | Ventilation assemblies |
WO2004070155A1 (en) * | 2003-02-07 | 2004-08-19 | Jane Cynthia Margaret Harding | Window vent |
JP4871714B2 (en) * | 2006-12-07 | 2012-02-08 | エムケー精工株式会社 | Ventilation equipment |
US20140113541A1 (en) * | 2012-10-22 | 2014-04-24 | II Paul E. DRIER | Ventilation device for building exterior |
US9469247B2 (en) * | 2013-11-21 | 2016-10-18 | Harman International Industries, Incorporated | Using external sounds to alert vehicle occupants of external events and mask in-car conversations |
US9551180B2 (en) * | 2014-06-04 | 2017-01-24 | Milgard Manufacturing Incorporated | System for controlling noise in a window assembly |
US20160093282A1 (en) * | 2014-09-29 | 2016-03-31 | Sina MOSHKSAR | Method and apparatus for active noise cancellation within an enclosed space |
-
2015
- 2015-11-02 FR FR1560495A patent/FR3043179A1/en active Pending
-
2016
- 2016-11-02 US US15/772,890 patent/US20180320922A1/en not_active Abandoned
- 2016-11-02 EP EP16809959.6A patent/EP3371521B1/en active Active
- 2016-11-02 WO PCT/FR2016/052836 patent/WO2017077233A1/en active Application Filing
Non-Patent Citations (1)
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FR3043179A1 (en) | 2017-05-05 |
WO2017077233A1 (en) | 2017-05-11 |
US20180320922A1 (en) | 2018-11-08 |
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