CN117579976A - Low-frequency transducer and active noise elimination system - Google Patents

Low-frequency transducer and active noise elimination system Download PDF

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Publication number
CN117579976A
CN117579976A CN202311429060.0A CN202311429060A CN117579976A CN 117579976 A CN117579976 A CN 117579976A CN 202311429060 A CN202311429060 A CN 202311429060A CN 117579976 A CN117579976 A CN 117579976A
Authority
CN
China
Prior art keywords
frequency transducer
piezoelectric stack
low
low frequency
shell
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.)
Pending
Application number
CN202311429060.0A
Other languages
Chinese (zh)
Inventor
吴牧云
代路
何涛
柯汉兵
徐广展
柯志武
赵振兴
郑召利
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
719th Research Institute Of China State Shipbuilding Corp
Original Assignee
719th Research Institute Of China State Shipbuilding Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 719th Research Institute Of China State Shipbuilding Corp filed Critical 719th Research Institute Of China State Shipbuilding Corp
Priority to CN202311429060.0A priority Critical patent/CN117579976A/en
Publication of CN117579976A publication Critical patent/CN117579976A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
    • 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
    • G10K2210/3226—Sensor details, e.g. for producing a reference or error signal

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

The invention relates to the technical field of active noise elimination, and provides a low-frequency transducer and an active noise elimination system. The low frequency transducer includes: the piezoelectric stack is adhered to the center of the bottom in the shell, the bottom of the vibration piece is connected with the top of the piezoelectric stack, the top of the vibration piece is connected with the top of the side wall of the shell, the piezoelectric stack is electrified to drive the vibration piece to vibrate, and sound waves are radiated to offset sound source noise. According to the invention, the piezoelectric stack is adhered to the center of the bottom of the shell, the bottom of the vibrating piece is connected with the piezoelectric stack, the top of the vibrating piece is connected with the top of the shell, when the acoustic sensor collects radiation noise generated by the acoustic source equipment, the piezoelectric stack is driven to do work, so that the vibrating piece vibrates, radiates acoustic waves and counteracts acoustic radiation of a controlled system, and the purpose of reducing structural acoustic radiation at a terminal is achieved. The low-frequency transducer has good directivity and excellent low-frequency performance, and can adapt to the pressurized working environment in a medium with corrosion and conductive characteristics.

Description

Low-frequency transducer and active noise elimination system
Technical Field
The invention relates to the technical field of active noise elimination, in particular to a low-frequency transducer and an active noise elimination system.
Background
In the prior art, related researches on an actuating mechanism of an active noise elimination system in a pressure environment are few, a bending transducer based on a piezoelectric structure is mainly used as the actuating mechanism at present, but the working frequency band of the traditional bending transducer is higher than the frequency range of attention of a low-frequency active noise elimination system, and vibration parts of the traditional bending transducer are of a symmetrical structure, so that the directivity is poor. While conventional transducers used in non-pressurized environments, such as low-frequency speakers, have excellent low-frequency performance and good directivity, they cannot be adapted to pressurized working environments with corrosive and conductive fluids.
Disclosure of Invention
The invention provides a low-frequency transducer and an active noise elimination system, which are used for solving the problems that the transducer in the prior art cannot meet the requirements of low-frequency performance, directivity and the like and cannot adapt to the under-pressure working environment of a medium with corrosion and conductive characteristics.
The invention provides a low frequency transducer comprising: the piezoelectric stack is adhered to the center of the bottom in the shell, the bottom of the vibration piece is connected with the top of the piezoelectric stack, the top of the vibration piece is connected with the top of the side wall of the shell, and the piezoelectric stack can drive the vibration piece to vibrate by being electrified, so that sound waves are radiated and used for counteracting sound source noise.
According to the low-frequency transducer provided by the invention, the bottom of the shell is provided with a plurality of through holes, and the through holes are positioned between the piezoelectric stack and the side wall of the shell; the low-frequency transducer further comprises a plurality of first flexible sealing elements and a plurality of second flexible sealing elements, the first flexible sealing elements and the second flexible sealing elements are respectively arranged on two sides of each through hole in a covering mode, and a sealing accommodating cavity for accommodating filling liquid is formed by the first flexible sealing elements, the inner wall of the shell, the piezoelectric stack and the second flexible sealing elements.
According to the invention, the filling liquid comprises a low-damping incompressible filling liquid.
According to the low-frequency transducer provided by the invention, the low-frequency transducer further comprises a cover plate, and the cover plate is covered on the top of the piezoelectric stack.
According to the low-frequency transducer provided by the invention, the side wall of the shell is provided with a plurality of liquid-permeable holes, a cavity is formed between the vibrating piece and the inner side wall of the shell, and the liquid-permeable holes are respectively communicated with the cavity.
According to the low-frequency transducer provided by the invention, the vibrating piece comprises the cone basin, the low-frequency transducer further comprises the folded lug, the bottom of the cone basin is connected with the cover plate, and the top of the cone basin is connected with the top of the shell through the folded lug.
According to the low-frequency transducer provided by the invention, the bending lug and the vibrating piece are made of elastic materials.
According to the low-frequency transducer provided by the invention, the shell comprises the bottom, the connecting part and the inclined part, the bottom of the connecting part is vertically connected with the bottom, the bottom of the inclined part is connected with the top of the connecting part, and the inclined part is obliquely arranged upwards in a direction away from the inside of the shell.
The invention also provides an active noise abatement system comprising a low frequency transducer as claimed in any one of the preceding claims.
According to the active noise elimination system provided by the invention, the active noise elimination system further comprises an acoustic sensor and a controller, wherein the acoustic sensor is connected with the controller, the acoustic sensor is used for collecting radiation noise in a medium, and the controller is used for acquiring data information of the acoustic sensor and driving the low-frequency transducer to operate according to the data information.
According to the low-frequency transducer and the active noise elimination system, the piezoelectric stack is adhered to the center of the bottom of the shell, the bottom of the vibrating piece is connected with the piezoelectric stack, the top of the vibrating piece is connected with the top of the shell, a cavity is formed between the vibrating piece and the inner wall of the shell, when the acoustic sensor collects radiation noise generated by the acoustic source equipment, the piezoelectric stack is driven to do work, so that the vibrating piece vibrates, radiates acoustic waves, counteracts acoustic radiation of a controlled system, and the purpose of reducing structural acoustic radiation at a terminal is achieved. The low-frequency transducer has good directivity and excellent low-frequency performance, and can adapt to the pressurized working environment in a medium with corrosion and conductive characteristics.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a bottom view of a low frequency transducer provided by the present invention;
FIG. 2 is a schematic cross-sectional view of the low frequency transducer A-A of FIG. 1 provided by the present invention;
reference numerals:
1. a housing; 11. a bottom; 12. a connection part; 13. an inclined portion; 131. a liquid-permeable hole; 2. a piezoelectric stack; 3. a vibrating member; 4. a cavity; 5. a first flexible seal; 6. a second flexible seal; 7. filling liquid; 8. a cover plate; 9. folding the ears.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.
The low frequency transducer and the active noise abatement system provided by the present invention are described below with reference to fig. 1 to 2.
The invention provides a low frequency transducer comprising: the piezoelectric stack 2 is adhered to the center of the bottom 11 in the shell 1, the bottom 11 of the vibration piece 3 is connected with the top of the piezoelectric stack 2, the top of the vibration piece 3 is connected with the top of the side wall of the shell 1, the piezoelectric stack 2 is electrified to drive the vibration piece 3 to vibrate, and sound waves are radiated to offset sound source noise.
Referring to fig. 2, the bottom of the piezoelectric stack 2 is adhered to the center of the bottom 11 in the housing 1 by using an adhesive, the bottom 11 of the vibrating member 3 is connected with the bottom 11 of the piezoelectric stack 2, the top of the vibrating member 3 is connected with the top of the housing 1, and a cavity 4 is formed by enclosing the inner wall of the housing 1, the outer wall surface of the piezoelectric stack 2 and the vibrating member 3; when the acoustic sensor collects radiation noise generated by the acoustic source device, the piezoelectric stack 2 is electrified, current of the piezoelectric stack 2 is adjusted, the vibrating piece 3 is driven to vibrate, the acoustic wave is radiated, and the noise generated by the acoustic source device is counteracted.
According to the low-frequency transducer provided by the invention, the piezoelectric stack 2 is adhered to the center of the bottom 11 of the shell 1, the bottom 11 of the vibrating piece 3 is connected with the piezoelectric stack 2, the top of the vibrating piece 3 is connected with the top of the shell 1, the cavity 4 is formed between the vibrating piece 3 and the inner wall of the shell 1, when the acoustic sensor collects radiation noise generated by the acoustic source equipment, the piezoelectric stack 2 is driven to do work, so that the vibrating piece 3 connected with the piezoelectric stack 2 vibrates, and the radiation acoustic wave counteracts the acoustic radiation of a controlled system, thereby achieving the purpose of reducing the structural acoustic radiation at a terminal. The low-frequency transducer has good directivity and excellent low-frequency performance, and can adapt to the pressurized working environment in a medium with corrosion and conductive characteristics.
In the invention, the bottom 11 of the shell 1 is provided with a plurality of through holes, and the through holes are positioned between the piezoelectric stack 2 and the side wall of the shell 1; the low-frequency transducer further comprises a plurality of first flexible sealing elements 5 and a plurality of second flexible sealing elements 6, the number of the first flexible sealing elements 5 and the number of the second flexible sealing elements 6 are the same as the number of through holes, the first flexible sealing elements 5 and the second flexible sealing elements 6 are respectively arranged on two sides of each through hole in a covering mode, and a sealing accommodating cavity for accommodating filling liquid 7 is formed by the first flexible sealing elements 5, the inner wall of the shell 1, the piezoelectric stack 2 and the second flexible sealing elements 6.
Referring to fig. 1 and 2, the bottom 11 of the case 1 is provided with 4 through holes, the 4 through holes are located between the piezoelectric stack 2 and the side wall of the case 1, and the 4 through holes are uniformly distributed around the central axis of the bottom 11 of the case 1.
Further, the low-frequency transducer further comprises a plurality of first flexible sealing elements 5 and a plurality of second flexible sealing elements 6, the number of the first flexible sealing elements 5 and the number of the second flexible sealing elements 6 are equal to the number of through holes, the number of the first flexible sealing elements 5 and the number of the second flexible sealing elements 6 are equal to the number of the through holes, the two sides of each through hole are respectively covered with the first flexible sealing elements 5 and the second flexible sealing elements 6, wherein the first flexible sealing elements 5 are arranged on the outer side of the bottom 11 of the shell 1 and cover the through holes, the second flexible sealing elements 6 are covered in the shell 1, the covering position of the second flexible sealing elements 6 can be designed according to the design requirement of the depth of the through holes, the depth of the through holes is consistent with the depth of the piezoelectric stack 2, the outer edges of the second flexible sealing elements 6 are arranged on the top surface of the piezoelectric stack 2 and the side wall surface of the shell 1, the covers the through holes of the second flexible sealing elements 6, the first flexible sealing elements 5 and the second flexible sealing elements 6 can avoid direct contact between the piezoelectric stack 2 and media with corrosion and conductive characteristics outside, and normal operation of the piezoelectric stack 2 is protected.
Further, the first flexible sealing element 5, the inner wall of the shell 1, the piezoelectric stack 2 and the second flexible sealing element 6 form a sealed accommodating cavity, filling liquid 7 is filled in the sealed accommodating cavity, the filling liquid 7 can balance pressure and prevent the structure from being damaged due to overhigh pressure, so that the low-frequency transducer is ensured to work normally, sound waves are radiated, noise of a controlled system is counteracted, and sound radiation of the controlled system is reduced from a terminal.
The number and the positions of the through holes in the invention are not particularly limited, and can be set according to actual requirements. In addition, the depth of the through hole is not particularly limited, and can be adjusted according to the actual use situation, the depth of the through hole (the depth of the sealed accommodating cavity) can be consistent with the height of the piezoelectric stack 2, and can be lower than the height of the piezoelectric stack 2, so that the pressure between the inside and the outside can be effectively relieved.
The first flexible seal 5 and the second flexible seal 6 in the present invention may each be a flexible diaphragm.
The filling liquid 7 in the invention comprises a low-damping incompressible filling liquid so as to balance the pressure of the inside and the outside environment of the low-frequency transducer and avoid the structure from generating large deformation.
Furthermore, the filling liquid 7 can also select filling liquid with a certain heat conductivity coefficient according to requirements, and the filling liquid 7 not only can play a role of balancing pressure, but also can disperse heat generated in the working process of the piezoelectric stack 2, so that the low-frequency transducer can reliably operate.
The low-frequency transducer provided by the invention further comprises the cover plate 8, wherein the cover plate 8 is arranged on the top of the piezoelectric stack 2 in a covering way, and the cover plate 8 can protect the piezoelectric stack 2 from corrosion and conductive media to influence the operation of the piezoelectric stack 2. The cover plate 8 also facilitates the provision of the second flexible seal 6, i.e. the outer edge of the second flexible seal 6 can be pressed under the cover plate 8, i.e. between the cover plate 8 and the piezo-stack 2, and also facilitates the connection of the vibrating element 3 to the piezo-stack 2, i.e. the vibrating element 3 to the cover plate 8.
To protect the normal operation of the piezoelectric stack 2, the piezoelectric stack 2 may be placed in a case, where the case includes a cover plate 8, and the cover plate 8 is covered on top of the piezoelectric stack 2.
The side wall of the shell 1 is also provided with a plurality of liquid-permeable holes 131, the liquid-permeable holes 131 are respectively communicated with the cavity 4 formed by the side wall of the shell 1 and the vibrating piece 3, and in the process that the piezoelectric stack 2 drives the vibrating piece 3 to vibrate, fluid media in the external environment can enter the cavity 4 through the liquid-permeable holes 131 so as to balance pressure pulsation during vibration, reduce the work load of the piezoelectric stack 2 and improve the quality of sound wave radiated by the vibrating piece 3.
The vibrating member 3 of the present invention includes a cone basin, the structure of which is not described in detail herein. The bottom 11 of the cone basin is connected with the cover plate 8, and the top of the cone basin is connected with the upper part of the top of the shell 1.
For convenient connection, the low-frequency transducer provided by the invention further comprises a folding lug 9, and the top of the cone basin is connected with the top of the shell 1 through the folding lug 9. Specifically, the bottom 11 of the lug 9 is connected with the top of the cone basin, the top of the lug 9 is connected with the top of the shell 1, and the cone basin is flexibly connected with the shell through the lug, so that the vibration displacement of the cone basin is increased.
The lug 9 and the vibrating piece 3 are made of elastic materials.
The housing 1 in the present invention may be funnel-shaped, referring to fig. 2, the housing 1 includes a bottom 11, a connection portion 12, and an inclined portion 13, wherein the bottom 11 of the connection portion 12 is connected with the bottom 11, and the connection portion 12 is perpendicular to the bottom 11; the top of the connection portion 12 is connected to the inclined portion 13, the inclined portion 13 is provided obliquely upward from the bottom 11, and the top of the inclined portion 13 is inclined in a direction away from the inside of the housing 1.
It is understood that the height of the connection portion 12 may be identical to the height of the piezoelectric stack 2, and the depth of a seal accommodating cavity formed by enclosing the first flexible sealing member 5, the inner wall surface of the connection portion 12, the inner wall of the piezoelectric stack 2, and the second flexible sealing member 6 is identical to the height of the connection portion 12, and the seal accommodating cavity is filled with the filling liquid 7 for balancing the internal and external pressures.
The low-frequency transducer provided by the invention can be applied to an active noise elimination system in liquid with corrosion and conductive characteristics, and has the advantages of strong directivity and low working frequency compared with the low-frequency transducer which is used as an actuating mechanism of the active noise elimination system and used in air by using the traditional bending transducer.
The first flexible sealing element 5, the second flexible sealing element 6, the liquid-permeable hole 131 and the filling liquid 7 are reasonably arranged, so that deformation caused by external pressure and pressure pulsation generated when the piezoelectric stack 2 works can be counteracted, and normal working of the piezoelectric stack in a medium with corrosion and conductive characteristics can be ensured.
The low-frequency transducer is suitable for vibration noise control in a pressurized environment, such as a pressurized environment in water, an air pressurized environment and the like.
The invention also provides an active noise elimination system, which comprises the low-frequency transducer in any embodiment.
The active muffler system further includes an acoustic sensor for collecting radiated noise in the medium and a controller for acquiring data information of the acoustic sensor and driving the low frequency transducer to operate based on the data information.
The low-frequency energy converter can be integrated with sound source equipment, an acoustic sensor is arranged near the sound source equipment and used for collecting data information of radiation noise generated by the sound source equipment in the medium, and the controller receives the data information and calculates control information so as to control the low-frequency energy converter to work and counteract noise radiated by the sound source equipment into the medium.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A low frequency transducer comprising: the piezoelectric stack is adhered to the center of the bottom in the shell, the bottom of the vibration piece is connected with the top of the piezoelectric stack, the top of the vibration piece is connected with the top of the side wall of the shell, and the piezoelectric stack can drive the vibration piece to vibrate by being electrified, so that sound waves are radiated and used for counteracting sound source noise.
2. The low frequency transducer of claim 1, wherein a bottom of the housing is provided with a plurality of through holes, the plurality of through holes being located between the piezoelectric stack and a side wall of the housing; the low-frequency transducer further comprises a plurality of first flexible sealing elements and a plurality of second flexible sealing elements, the first flexible sealing elements and the second flexible sealing elements are respectively arranged on two sides of each through hole in a covering mode, and a sealing accommodating cavity for accommodating filling liquid is formed by the first flexible sealing elements, the inner wall of the shell, the piezoelectric stack and the second flexible sealing elements.
3. The low frequency transducer of claim 2, wherein the fill fluid comprises a low damping incompressible fill fluid.
4. The low frequency transducer of claim 1, further comprising a cover plate covering a top portion of the piezoelectric stack.
5. The low frequency transducer of claim 4, wherein the side wall of the housing is provided with a plurality of liquid-permeable holes, a cavity is formed between the vibrating member and the inner side wall of the housing, and the plurality of liquid-permeable holes are respectively communicated with the cavity.
6. The low frequency transducer of claim 4, wherein the vibrating member comprises a cone, the low frequency transducer further comprises a folded ear, a bottom of the cone is connected to the cover plate, and a top of the cone is connected to a top of the housing through the folded ear.
7. The low frequency transducer of claim 6, wherein the horn and the vibrating member are each made of an elastic material.
8. The low frequency transducer of any of claims 1-7, wherein the housing comprises a bottom portion, a connecting portion, and an inclined portion, the bottom portion of the connecting portion is vertically connected to the bottom portion, the bottom portion of the inclined portion is connected to the top portion of the connecting portion, and the inclined portion is disposed obliquely upward toward a direction away from the interior of the housing.
9. An active muffler system comprising a low frequency transducer as claimed in any one of claims 1 to 8.
10. The active muffler system of claim 9, further comprising an acoustic sensor coupled to the controller, the acoustic sensor configured to collect radiation noise in a medium, and a controller configured to acquire data information of the acoustic sensor and to drive the low frequency transducer to operate based on the data information.
CN202311429060.0A 2023-10-31 2023-10-31 Low-frequency transducer and active noise elimination system Pending CN117579976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311429060.0A CN117579976A (en) 2023-10-31 2023-10-31 Low-frequency transducer and active noise elimination system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311429060.0A CN117579976A (en) 2023-10-31 2023-10-31 Low-frequency transducer and active noise elimination system

Publications (1)

Publication Number Publication Date
CN117579976A true CN117579976A (en) 2024-02-20

Family

ID=89859713

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311429060.0A Pending CN117579976A (en) 2023-10-31 2023-10-31 Low-frequency transducer and active noise elimination system

Country Status (1)

Country Link
CN (1) CN117579976A (en)

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