WO2017200490A1 - Fenêtre dotée d'une prise en charge du bruit et procédés associés - Google Patents

Fenêtre dotée d'une prise en charge du bruit et procédés associés Download PDF

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Publication number
WO2017200490A1
WO2017200490A1 PCT/SG2017/050260 SG2017050260W WO2017200490A1 WO 2017200490 A1 WO2017200490 A1 WO 2017200490A1 SG 2017050260 W SG2017050260 W SG 2017050260W WO 2017200490 A1 WO2017200490 A1 WO 2017200490A1
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WO
WIPO (PCT)
Prior art keywords
transparent
cell
noise
film speaker
electroactive film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SG2017/050260
Other languages
English (en)
Inventor
Kui Yao
Meysam SHARIFZADEH MIRSHEKARLOO
Chin Yaw Tan
Zhang Lei
Shuting Chen
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Agency for Science Technology and Research Singapore
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Agency for Science Technology and Research Singapore
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Filing date
Publication date
Application filed by Agency for Science Technology and Research Singapore filed Critical Agency for Science Technology and Research Singapore
Priority to SG11201808550RA priority Critical patent/SG11201808550RA/en
Publication of WO2017200490A1 publication Critical patent/WO2017200490A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/20—Doors, windows, or like closures for special purposes; Border constructions therefor for insulation against noise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
    • 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
    • G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3227—Resonators
    • G10K2210/32271—Active resonators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/028—Casings; Cabinets ; Supports therefor; Mountings therein associated with devices performing functions other than acoustics, e.g. electric candles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones
    • H04R2410/05—Noise reduction with a separate noise microphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/005—Circuits for transducers for combining the signals of two or more microphones

Definitions

  • the present invention relates broadly, but not exclusively, to a window system, to a method of managing noise and to a method of installing a noise management system on a window.
  • a major challenge for reducing noise transmission through a window is that the noise reduction is desired to be effective across the whole window area while the window should still remain transparent and be aesthetically acceptable.
  • double-glazed technology is one of the main passive means to reduce noise transmission through window.
  • this technology is not satisfactory in low frequency range.
  • Embedding active noise mitigation elements within double glazed windows has led in improved noise mitigation performance at low frequencies.
  • electromagnetic loud-speakers can be embedded within the air gap of the double glazed window.
  • such windows are bulky and costly, and not aesthetically acceptable.
  • Alternative actuators instead of electromagnetic loud speakers may be discretely installed on the window glass, connected to driver circuits to realize active noise control, particularly for low frequency noise.
  • these windows are not able to achieve uniform noise mitigation over the entire area, in addition to the increased cost, and reduced transparency and aesthetics. The reduction of noise may vary significantly at different locations. Analysis results show that uniform noise mitigation can be achieved only when the length of the window glass pane is less than one-fifth of the wavelength of sound in air (e.g. 0.14 ⁇ 0.14 m 2 for frequencies up to 500 Hz). Such a small window glass is not practical for real applications.
  • the primary noise is normally measured by a reference microphone and analyzed and processed using a control system.
  • the control system then generates a driving signal to drive the loud speaker to generate an anti-phase acoustic wave for mitigating the primary noise.
  • several reference microphones and several loud speakers have to be installed on the windows, which can further increase the cost of the window and aggravate the aesthetic issue.
  • An aspect of the present invention provides a window system comprising a ventilation channel and a noise management system in or adjacent the ventilation channel.
  • the noise management system comprises a multi-cell transparent electroactive film speaker comprising a plurality of individually operable electroactive cells, wherein each cell includes a respective series of resonance frequencies such that the multi-cell transparent electroactive film speaker is capable of multiple series of resonance frequencies, and a control unit connected to the multi-cell transparent electroactive film speaker.
  • the control unit is configured to actively detect an incident noise entering the ventilation channel and control at least one cell of the multi-cell transparent electroactive film speaker to generate a corresponding counter noise to substantially cancel the incident noise.
  • the multi-cell transparent electroactive film speaker may comprise a layered structure comprising a plurality of transparent patterned top electrodes corresponding to the plurality of cells, a transparent electroactive layer disposed below the transparent top electrodes, a transparent bottom electrode layer disposed below the transparent electroactive layer, and a transparent substrate layer disposed below the transparent bottom electrode layer.
  • the layered structure may further comprise a transparent grid configured to mechanically secure the individual cells and separate the cells from each other.
  • the individual transparent top electrodes may be electrically separated from each other.
  • Each cell of the multi-cell transparent electroactive film speaker may comprise a respective size corresponding to its series of resonance frequencies.
  • Each cell of the multi-cell transparent electroactive film speaker may comprise a respective geometry corresponding to its series of resonance frequencies.
  • the transparent electroactive layer may comprise a transparent piezoelectric material.
  • the control unit may comprise a first acoustic sensor to actively detect the incident noise and a second acoustic sensor configured to detect a transmitted noise exiting the ventilation channel, and the control unit may be further configured to adjust the counter noise generated by the at least one cell based on the detected transmitted noise.
  • the control unit may comprise a first acoustic sensor to actively detect the incident noise, and the first acoustic sensor may comprise at least one selected cell of the multi-cell transparent electroactive film speaker.
  • the window system may further comprise at least one sash, and the at least one sash may be rotationally adjustable to form the ventilation channel.
  • the window system may further comprise at least one sash, and the at least one sash may be translationally adjustable to form the ventilation channel.
  • the window system may comprise a first sash and a second sash, and the ventilation channel may be in a space between the first and second sashes.
  • Another aspect of the present invention provides a method of managing noise.
  • the method comprises providing, on a window having a ventilation channel, a multi-cell transparent electroactive film speaker and a control unit connected to the multi-cell transparent electroactive film speaker, the multi-cell transparent electroactive film speaker comprising a plurality of individually operable electroactive cells, wherein each cell includes a respective series of resonance frequencies such that the multi-cell transparent electroactive film speaker is capable of multiple series of resonance frequencies.
  • the method further comprises actively detecting, by the control unit, an incident noise entering the ventilation channel, and generating a corresponding counter noise to substantially cancel the incident noise by controlling at least one cell of the multi-cell transparent electroactive film speaker based on the detected incident noise.
  • Providing the multi-cell transparent electroactive film speaker may comprise providing a layered structure comprising a plurality of transparent patterned top electrodes corresponding to the plurality of cells, a transparent electroactive layer disposed below the transparent top electrodes, a transparent bottom electrode layer disposed below the transparent electroactive layer, a transparent substrate layer disposed below the transparent bottom electrode layer, and a transparent grid configured to mechanically secure the individual cells and separate the cells from each other.
  • the transparent electroactive layer may comprise a transparent piezoelectric material.
  • Actively detecting the incident noise may comprise using a first acoustic sensor.
  • the method may further comprise detecting a transmitted noise exiting the ventilation channel using a second acoustic sensor, and adjusting the counter noise generated by the at least one cell based on the detected transmitted noise.
  • Actively detecting the incident noise may comprise using a first acoustic sensor, and the first acoustic sensor may comprise at least one selected cell of the multi-cell transparent electroactive film speaker.
  • Another aspect of the present invention provides a method of installing a noise management system on a window.
  • the method comprises mounting a multi- cell transparent electroactive film speaker in or adjacent a ventilation channel of the window, the multi-cell transparent electroactive film speaker comprising a plurality of individually operable electroactive cells, wherein each cell includes a respective series of resonance frequencies such that the multi-cell transparent electroactive film speaker is capable of multiple series of resonance frequencies.
  • the method further comprises connecting a control unit to the multi-cell transparent electroactive film speaker, the control unit being configured to actively detect an incident noise entering the ventilation channel and control at least one cell of the multi-cell transparent electroactive film speaker to generate a corresponding counter noise to substantially cancel the incident noise.
  • Mounting the multi-cell transparent electroactive film speaker may comprise mounting a layered structure comprising a plurality of transparent patterned top electrodes corresponding to the plurality of cells, a transparent electroactive layer disposed below the transparent top electrodes, a transparent bottom electrode layer disposed below the transparent electroactive layer, a transparent substrate layer disposed below the transparent bottom electrode layer, and a transparent grid configured to mechanically secure the individual cells and separate the cells from each other.
  • the control unit may comprise a first acoustic sensor, a second acoustic sensor, and a control circuit communicatively coupled to the first and second acoustic sensors.
  • the first acoustic sensor may comprise at least one selected cell of the multi-cell transparent electroactive film speaker.
  • Figure 1 shows a schematic block diagram of a window system according to an example embodiment.
  • Figure 2a shows a schematic plan view of a multi-cell transparent electroactive film speaker of the system of Figure 1 according to the example embodiment.
  • Figure 2b shows a schematic cross-sectional view of the multi-cell transparent electroactive film speaker of Figure 2a.
  • Figure 3 shows the window system of Figure 1 including a block diagram of the control unit according to an example embodiment.
  • Figure 4 shows the window system of Figure 1 including a block diagram of the control unit according to an alternate embodiment.
  • Figure 5 shows a schematic perspective view of an implementation of the window system of Figure 1 .
  • Figure 6 shows a schematic side view of another implementation of the window system of Figure 1 .
  • Figure 7 shows a schematic perspective view of another implementation of the window system of Figure 1 .
  • Figure 8 shows a schematic top view of another implementation of the window system of Figure 1 .
  • Figure 9 shows a flow chart of a method of managing noise according to an example embodiment.
  • Figure 10 shows flow chart of a method of installing a noise management system on a window according to an example embodiment.
  • the example embodiments provide a window system having both ventilation and noise management over a broad audio frequency range.
  • the window system comprises a ventilation channel and a noise management system in or adjacent the ventilation channel.
  • the noise management system comprises a multi-cell transparent electroactive film speaker and a control unit connected to the multi-cell transparent electroactive film speaker.
  • the multi-cell transparent electroactive film speaker includes a plurality of individually operable electroactive cells. Each cell includes a respective series of resonance frequencies such that the multi-cell transparent electroactive film speaker is capable of multiple series of resonance frequencies.
  • the control unit is configured to actively detect an incident noise entering the ventilation channel and control at least one cell of the multi-cell transparent electroactive film speaker to generate a corresponding counter noise to cancel the incident noise.
  • the example embodiments also provide a method of managing noise and a method of installing a noise management system on a window.
  • FIG. 1 shows a schematic block diagram of a window system 100 according to an example embodiment.
  • the window system 100 comprises a ventilation channel 102, a transparent film speaker 104 having a plurality of individually operable electroactive cells (hereinafter also referred to as a multi-cell transparent electroactive film speaker 104) in the ventilation channel 102 and a control unit 106.
  • the multi-cell transparent electroactive film speaker 104 is made up of multiple speaker cells which have varied geometries and/or dimensions, and hence varied resonance frequencies from each other.
  • an incident (or primary) noise 108 enters the ventilation channel 102 and is detected by the control unit 106.
  • the control unit 106 causes the multi-cell transparent electroactive film speaker 104 to emit a corresponding counter noise 1 10 to substantially cancel or reduce the incident noise 108.
  • the counter noise 1 10 is anti-phase to the incident noise 108 (e.g. 180° out of phase) and destructively interferes or interacts with the incident noise 108, such that a transmitted noise 1 12 exiting the ventilation channel is reduced or minimised.
  • the window system 100 can help to mitigate noise coming into the building from an outdoor environment.
  • FIG. 2a and 2b show schematic top view and cross-sectional view, respectively, of the multi-cell transparent electroactive film speaker 104 of the window system 100 according to an example embodiment.
  • the multi-cell transparent electroactive film speaker 104 includes a plurality of transparent patterned top electrodes 202 corresponding to the plurality of speaker cells 204, a transparent electroactive layer 206 disposed below the transparent top electrode electrodes 202, a transparent bottom electrode layer 208 disposed below the transparent electroactive layer 206, and a transparent substrate layer 210 disposed below the bottom electrode layer 208.
  • the transparent substrate layer 210 can move the neutral line of the structure out of the transparent electroactive layer 206. For example, by forming the transparent substrate layer 210 with the right material and thickness, the magnitude of the vibration excited by the electric field, and hence the sound pressure performance of the multi-cell transparent electroactive film speaker 104, can be significantly improved.
  • the multi-cell transparent electroactive film speaker 104 further includes a transparent grid 212.
  • the transparent grid 212 and patterned top electrodes 202 separate the transparent electroactive film speaker 104 into the multiple speaker cells, mechanically and electrically respectively, such that each speaker cell has its own set of resonance frequencies preferably different from the others and can be operated independently.
  • the speaker cells 204 have different sizes and geometry, resulting in corresponding different acoustic characteristics.
  • a square speaker cell 204 may exhibit different set of resonance frequencies from a rectangular speaker cell 204.
  • a smaller speaker cell 204 may have different set of resonance frequencies from a larger speaker cell 204.
  • broadband performance a wide variety of geometry and sizes may be used. For specific situations, e.g. low frequency noise, these parameters can be adapted accordingly such that the speaker cells are responsive to the desired frequency range.
  • the transparent electroactive layer 206 of the multi-cell transparent electroactive film speaker 104 may be fabricated form a transparent piezoelectric polymer with sufficiently high piezoelectric strain coefficients, including but not limited to polyvinylidene fluoride (PVDF), polyvinylidene fluoride— trifluoroethylene (P(VDF- TrFE)), or a transparent electroactive polymer including but not limited to electrets and dielectric elastomers.
  • PVDF polyvinylidene fluoride
  • P(VDF- TrFE) polyvinylidene fluoride— trifluoroethylene
  • a transparent electroactive polymer including but not limited to electrets and dielectric elastomers.
  • the transparent top and bottom electrode layers 202, 208 may be fabricated by coating a transparent conductive material including but not limited to indium tin oxide (ITO), carbon nano-tube, carbon nano-bud, graphene, metal nano- wires, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), on the transparent electroactive layer 206.
  • ITO indium tin oxide
  • carbon nano-tube carbon nano-bud
  • graphene metal nano- wires
  • PEDOT:PSS poly(3,4-ethylenedioxythiophene) polystyrene sulfonate
  • FIG. 3 shows the window system 100 of Figure 1 including a block diagram of the control unit 106 according to an example embodiment.
  • the control unit 106 comprises a first acoustic sensor in the form of at least one reference microphone 302, an analog to digital converter (ADC) 304, a digital signal processing (DSP) unit 306, a digital to analog converter (DAC) 308, a power amplifier 310 and a second acoustic sensor in the form of an error microphone 312.
  • a primary (i.e. incident) noise 108 which is carried by the air flow through the ventilation channel 102, is sensed by the reference microphone 302.
  • the ADC 304 converts the input analog primary noise signal from the reference microphone 302 to digital format data which is processed by the digital signal processing unit 306, based on a digital signal processor or field programmable gate array (FPGA), to generate a suitable digital output signal to be fed to the DAC 308 to produce an analog signal.
  • the analog signal output of DAC 308 is amplified via the power amplifier 310 and fed to the multi-cell transparent electroactive film speaker 104 to generate multiple cancelling (i.e. counter) noise 1 10 of anti-phase with the primary noise 108 at the various resonance frequencies of individual cells of the multi-cell transparent electroactive film speaker 104.
  • the control unit 106 includes a feedback loop to optimise or tune the speaker 104.
  • FIG. 4 shows the window system 100 of Figure 1 including a block diagram of a control unit 400 according to an alternate embodiment.
  • the electroactive layer 206 ( Figure 2b) is made of a piezoelectric material and the reference microphones are replaced with one or more sound sensors 402 integrated on a multi-cell transparent piezoelectric film speaker 403 (i.e. a multi-cell transparent electroactive film speaker in which the electroactive layer comprises a piezoelectric material).
  • the sound sensors 402 have the same structure as speaker cells 404 of the multi-cell transparent piezoelectric film speaker 403 and are fabricated on the same transparent piezoelectric film. Due to the piezoelectric effect, the primary noise 108 can generate an electrical signal as the output of the sound sensors 402.
  • the electrical signal is used by the control unit 400 to generate the driving signal to activate the multi- cell transparent piezoelectric film speaker 403 to generate the desired counter noise 1 10, similar to the operation of the control unit as described in Figure 3.
  • sound pressure level of the cancelling noise 1 10 generated by the multi-cell transparent electroactive film speaker 104 is largest at resonance frequencies of the speaker cells. Due to different sizes and shapes of the speaker cells of the multi-cell transparent electroactive film speaker 104 in the example embodiments, each of the speaker cells possesses a series of resonance frequencies different from the others. As a result, the multi-cell transparent electroactive film speaker 104 has multiple series of resonance frequencies over a broad frequency range. Since the sound pressure is largest at the resonance frequencies, the multi-cell transparent electroactive film speaker 104 has large sound pressure output over a broad frequency range and thus can minimize the transmitted noise over a broad audio frequency range.
  • a multi-cell transparent piezoelectric film speaker (i.e. one in which the electroactive layer comprises a piezoelectric material) comprising a 25 ⁇ thick PVDF film and a 75 ⁇ thick polyethylene terephthalate (PET) substrate was simulated and the resonance frequencies of each of the speaker cells were examined.
  • Six different sizes and geometries of speaker cells were combined to form the multi-cell transparent piezoelectric film speaker having 15 speaker cells in total.
  • Table 1 summarizes the simulation results of frequencies for the first three resonance modes. It has been found that the multi-cell transparent piezoelectric film speaker exhibits multiple resonance frequencies in the range of 69-938 Hz.
  • the window system 100 as described can be implemented in various building designs, either as a complete replacement of a conventional window or as a retrofit or upgrade thereof. While existing solutions are generally against having an opening for air flow, the window system 100 has the advantage of both ventilation and noise management capabilities, and indeed uses the ventilation channel for effective noise management.
  • FIG. 5 shows a schematic perspective view of an implementation of the window system 100 of Figure 1 in the form of a noise mitigation window 500.
  • the window 500 comprises split lower and upper parts 502, 504.
  • the lower part 502 is the conventional window without ventilation when closed.
  • the upper part 504 of the window 500 has a sash 506 which can be rotationally adjusted to have a certain opening to form a ventilation channel 508.
  • the upper part 504 of the window 500 further comprises a multi-cell transparent piezoelectric film speaker 510 on the sash 506 in the ventilation channel 508 and a control system 512.
  • FIG. 6 shows a schematic side view of another implementation of the window system 100 of Figure 1 in the form of a noise mitigation window 600.
  • the window 600 comprises split upper and lower parts 602, 604.
  • the lower part 604 is the conventional window without ventilation when closed.
  • the upper part 602 has a ventilation channel 606 with a front sash 608 and a rear sash 610.
  • the window 600 further comprises a multi-cell transparent piezoelectric film speaker 612 in the ventilation channel 606 and a control system 614.
  • a primary (i.e. incident) noise 618 enters the ventilation channel 606 with the air flow.
  • the multi-cell transparent piezoelectric film speaker 612 is activated by the control system 614 and generates a broad band cancelling noise (i.e. counter noise) 620 over a large area, with anti-phase to the primary noise 618, and results in a reduction of transmitted noise 622 through the window 600.
  • a broad band cancelling noise i.e. counter noise
  • FIG. 7 shows a schematic perspective view of another implementation of the window system of Figure 1 in the form of a noise mitigation window 700.
  • the window 700 comprises split upper and lower parts 702, 704.
  • the upper and lower parts 702, 704 each have a ventilation channel with front and rear sashes.
  • the upper part 702 has an upper ventilation channel 706 with upper front sash 708 and upper rear sash 710
  • the lower part 704 has a lower ventilation channel 712 with lower front sash 714 and lower rear sash 716.
  • the window 700 further comprises two multi-cell transparent piezoelectric film speakers 718, 720, one (718) in the upper ventilation channel 706 of the upper part 702 and another (720) in the lower ventilation channel 712 of the lower part 704, and a control system 722.
  • the noise mitigation window 700 may allow more ventilation as well as effective noise mitigation performance.
  • FIG 8 shows a schematic top view of another implementation of the window system of Figure 1 in the form of a noise mitigation window 800.
  • the window 800 comprises a ventilation channel 802 formed between a front sliding sash 804 and a rear sliding sash 806 spaced from and opposite to the front sliding sash 804 in relation to a window frame 808.
  • the window 800 further comprises a multi-cell transparent piezoelectric film speaker 810 mounted on an optional transparent supporting layer 812 in the ventilation channel 802, and a control system 814.
  • a primary noise 816 enters the ventilation channel 802 together with the air flow.
  • the multi-cell transparent piezoelectric film speaker 810 is activated by the control system 814 and generates a broadband cancelling noise 818 over a large area, with anti-phase to the primary noise 816, and results in a reduction of transmitted noise 820 through the window 800.
  • this implementation is suitable for implementation to windows with a slidable (i.e. translationally adjustable) sash.
  • the multi-cell transparent piezoelectric film speaker 810 of this implementation can cover a larger area within the ventilation channel 802 for a more effective interaction between the primary noise 816 and cancelling noise 818.
  • FIG. 9 shows a flow chart 900 of a method of managing noise according to an example embodiment.
  • a multi-cell transparent electroactive film speaker and a control unit connected to the multi-cell transparent electroactive film speaker are provided on a window having a ventilation channel.
  • the multi-cell transparent electroactive film speaker comprises a plurality of individually operable electroactive cells, and each cell includes a respective series of resonance frequencies such that the multi-cell transparent electroactive film speaker is capable of multiple series of resonance frequencies.
  • the control unit actively detects an incident noise entering the ventilation channel.
  • a corresponding counter noise to substantially cancel the incident noise is generated by controlling at least one cell of the multi-cell transparent electroactive film speaker based on the detected incident noise.
  • FIG. 10 shows flow chart of a method of installing a noise management system on a window according to an example embodiment.
  • a multi- cell transparent electroactive film speaker is mounted in or adjacent a ventilation channel of the window.
  • the multi-cell transparent electroactive film speaker comprises a plurality of individually operable electroactive cells, and each cell includes a respective series of resonance frequencies such that the multi-cell transparent electroactive film speaker is capable of multiple series of resonance frequencies.
  • a control unit is connected to the multi-cell transparent electroactive film speaker. The control unit is configured to actively detect an incident noise entering the ventilation channel and control at least one cell of the multi-cell transparent electroactive film speaker to generate a corresponding counter noise to substantially cancel the incident noise.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Building Environments (AREA)

Abstract

L'invention concerne un système de fenêtre, un procédé de prise en charge du bruit et un procédé d'installation d'un système de prise en charge du bruit sur une fenêtre. Le système de fenêtre comprend un canal de ventilation et un système de prise en charge du bruit dans ou à côté du canal de ventilation. Le système de prise en charge du bruit comprend un haut-parleur à film électroactif transparent à plusieurs cellules et une unité de commande connectée au haut-parleur à film électroactif transparent à plusieurs cellules. Le haut-parleur à film électroactif transparent à plusieurs cellules comprend une pluralité de cellules électroactives pouvant fonctionner individuellement. Chaque cellule comprend une série respective de fréquences de résonance de telle sorte que le haut-parleur à film électroactif transparent à plusieurs cellules permet plusieurs séries de fréquences de résonance. L'unité de commande est configurée pour détecter activement un bruit incident pénétrant dans le canal de ventilation et pour commander au moins une cellule du haut-parleur à film électroactif transparent à plusieurs cellules pour générer un contre-bruit correspondant afin d'annuler sensiblement le bruit incident.
PCT/SG2017/050260 2016-05-18 2017-05-18 Fenêtre dotée d'une prise en charge du bruit et procédés associés Ceased WO2017200490A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SG11201808550RA SG11201808550RA (en) 2016-05-18 2017-05-18 Window with noise management and related methods

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG10201603967P 2016-05-18
SG10201603967P 2016-05-18

Publications (1)

Publication Number Publication Date
WO2017200490A1 true WO2017200490A1 (fr) 2017-11-23

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PCT/SG2017/050260 Ceased WO2017200490A1 (fr) 2016-05-18 2017-05-18 Fenêtre dotée d'une prise en charge du bruit et procédés associés

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SG (1) SG11201808550RA (fr)
WO (1) WO2017200490A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020040702A1 (fr) * 2018-08-23 2020-02-27 Agency For Science, Technology And Research Système de gestion de bruit, système de fenêtre et procédés associés
EA035603B1 (ru) * 2017-12-14 2020-07-15 Ерлан Жандарбекович Джунусбеков Устройство и виброгенератор для подавления акустических шумов

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519637A (en) * 1993-08-20 1996-05-21 Mcdonnell Douglas Corporation Wavenumber-adaptive control of sound radiation from structures using a `virtual` microphone array method
US20020080684A1 (en) * 2000-11-16 2002-06-27 Dimitri Donskoy Large aperture vibration and acoustic sensor
DE10052093B4 (de) * 2000-10-20 2004-06-24 Jakob, André, Dr. Verwendung von Schallerzeugern in Fensterrahmen zur Schalldämmung
US20070081681A1 (en) * 2005-10-03 2007-04-12 Xun Yu Thin film transparent acoustic transducer
CN101881119A (zh) * 2010-06-11 2010-11-10 南京大学 一种有源降噪通风隔声推拉窗
US20140117812A1 (en) * 2012-10-26 2014-05-01 Arman HAJATI Micromachined ultrasonic transducer arrays with multiple harmonic modes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519637A (en) * 1993-08-20 1996-05-21 Mcdonnell Douglas Corporation Wavenumber-adaptive control of sound radiation from structures using a `virtual` microphone array method
DE10052093B4 (de) * 2000-10-20 2004-06-24 Jakob, André, Dr. Verwendung von Schallerzeugern in Fensterrahmen zur Schalldämmung
US20020080684A1 (en) * 2000-11-16 2002-06-27 Dimitri Donskoy Large aperture vibration and acoustic sensor
US20070081681A1 (en) * 2005-10-03 2007-04-12 Xun Yu Thin film transparent acoustic transducer
CN101881119A (zh) * 2010-06-11 2010-11-10 南京大学 一种有源降噪通风隔声推拉窗
US20140117812A1 (en) * 2012-10-26 2014-05-01 Arman HAJATI Micromachined ultrasonic transducer arrays with multiple harmonic modes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA035603B1 (ru) * 2017-12-14 2020-07-15 Ерлан Жандарбекович Джунусбеков Устройство и виброгенератор для подавления акустических шумов
WO2020040702A1 (fr) * 2018-08-23 2020-02-27 Agency For Science, Technology And Research Système de gestion de bruit, système de fenêtre et procédés associés
US11393445B2 (en) 2018-08-23 2022-07-19 Agency For Science, Technology And Research Noise management system, a window system and related methods

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