CN101264798A - Three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition device - Google Patents
Three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition device Download PDFInfo
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- CN101264798A CN101264798A CNA2008100370997A CN200810037099A CN101264798A CN 101264798 A CN101264798 A CN 101264798A CN A2008100370997 A CNA2008100370997 A CN A2008100370997A CN 200810037099 A CN200810037099 A CN 200810037099A CN 101264798 A CN101264798 A CN 101264798A
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Abstract
The invention relates to a fluctuating pressure and pneumatic noise suppression device for three-dimensional cavity resonates, belonging to flow control technical field, comprising an aligned array groove, an actuating reed, a piezoelectric ceramic piece, an installing seat, a special high voltage power supply for piezoelectric ceramic, a dynamic pressure transducer and a computer with an A/D acquisition card. The dynamic pressure transducer is arranged under the cavity, and is connected with the computer with A/D acquisition card by the through hole under the cavity. The actuating reed is arranged in the aligned array groove. The piezoelectric ceramic piece is pasted on the bottom of the reed to be the excitation element. The piezoelectric ceramic piece is connected with the special high voltage power supply for piezoelectric ceramic. The piezoelectric ceramic piece produces extensional deformation under the control signal excitation, and drives the actuating reed to vibrate, the oscillation frequency of the shear layer is changed, the cavity resonates is broken down, and the cavity pneumatic noise is suppressed. The fluctuating pressure and pneumatic noise suppression device for three-dimensional cavity resonates has the advantages of wide adjustable range, realizing the accurate control of the phased array for the three-dimensional space of the cavity by the real time feedback of the fluctuating pressure of cavity.
Description
Technical field
The present invention relates to a kind of electromechanical device of vibration and noise field of engineering technology, specifically is a kind of device that utilizes distributed piezoelectric type exiter to carry out three-dimensional lumen pulsating pressure and aerodynamics noise inhibition.
Background technology
When high-velocity fluid flows through cavity structure,, produce pulsation such as violent pressure, speed because strong self sustained oscillation phenomenon can appear in mobile mutual action in accent shear layer and the chamber, i.e. cavity self sustained oscillation, and give off strong noise thus.The weapon-bay of fighter plane, the formed cavity of magazine, under the effect of high velocity air, the pulsating pressure level of vibration can surpass 180dB; During takeoff and landing, the noise that the pulsating pressure of landing gear compartment causes has become one of its overriding noise.In addition, the cavity pulsating pressure can make aircraft fuselage structures bear extra non-permanent load, and the inefficacy that accelerates fatigue influences flight safety.This strong acoustic load also can damage the sensitivity of electronics package, influences the service life of aircraft.Cavity vibration inhibition technology is to take measures, and reduces the pulsating pressure in the cavity, reduces aerodynamics noise.
Cavity self sustained oscillation mechanism complexity, the vibration of representative type cavity comprises following feature: boundary 1ayer separates in the accent leading edge, causes the erratic fluctuations of cavity opening part shear layer.The shear layer and the cavity trailing edge of fluctuation bump, and produce perturbation wave.Perturbation wave is passed the cavity leading edge back, forms backfeed loop with the shear layer mutual action.Include a large amount of whirlpools that comes off from the accent leading edge in the unsettled shear layer, its shedding frequence is relevant with cavity structure size, speed of incoming flow, density etc.When cavity geometric resonance frequency comes off whirlpool frequency or its higher order resonances frequency near shear layer, will in the chamber, form resonance, cause that noise increases rapidly in the chamber, form the cavity self sustained oscillation.The core that the cavity vibration suppresses is exactly to break self sustained oscillation by destroying backfeed loop.
Past cavity vibration is static passive control device with aerodynamic noise inhibition device mostly.The major defect of this class device is exactly only to play the effect that suppresses noise in the certain speed of incoming flow scope under design conditions; In case bigger change takes place speed of incoming flow, it is very limited that vibration suppresses effect.In addition, the general expenditure of energy of this class device is higher, and actual application value is little.Beginning of this century late nineteen nineties, development along with modern control technology, material technology, information techenology, by the local mode of injecting the active Flow Control of less energy of convection cell, seek cavity and suppress Study on Technology, greatly promoted the development of cavity vibration inhibition technology.Active Flow Control has broken through traditional technology barrier, can be used for improving the traveling comfort and the safety of aircraft, has huge direct and potential economy, environmental benefit, also has using value widely aspect military and national defense.A large amount of research both at home and abroad all confirms, introduces advanced active Flow Control and have simple in structurely in the cavity self sustained oscillation, and energy consumption is low, plurality of advantages such as work efficiency height.
Through the literature search of prior art is found, US Patent Aircraft Cavity AcousticResonance Suppression System (Granted publication number be US005699981).The main cylinder pure tone generator of this contrive equipment is formed.This cylinder is arranged in the cavity leading edge, vertically comes flow path direction, can produce peripheral flow when incoming flow flows through cylinder, forms the whirlpool that comes off in a large number.The cylinder whirlpool frequency height that comes off, yardstick is little, bumps with shear layer, causes the rapid dissipation in shear layer whirlpool, quickens tubulence energy and withers away.Its deficiency mainly is flox condition comparatively responsive, and the change of incoming flow flow regime can influence its action effect.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition device are provided, make it suppress cavity resonance, reduce discrete noise and part broadband noise under the self sustained oscillation frequency, control aerodynamics noise sound pressure level.The present invention by distributed exciter array, has realized extensive layout on the basis that keeps the advantage that piezoceramic exiter volume is little, energy consumption is low, speed of response is fast, can vibrate to cavity at three dimensional space to carry out Comprehensive Control.This system can work under the speed of incoming flow on a large scale, and applicability strengthens; Volume is littler, has very strong anti-interference resistance, can be under the big load of high flow rate stable operation, strengthened stability and reliability.In addition, by the real-time feedback of sensor, be easy to be implemented in the phased array self-adaptive processing on the room and time to the cavity noise.
The present invention is achieved by the following technical solutions, the present invention includes: array groove, the computing machine of making movable contact spring, piezoelectric ceramic piece, mount pad, piezoceramic high-voltage power supply special, dynamic pressure transducer and being furnished with the A/D capture card.The array groove is distributed in cavity and comes on the plane of flow path direction.Dynamic pressure transducer is installed in the bottom of cavity, is connected with the computing machine of being furnished with the A/D capture card.Make movable contact spring one end and be fixed on the mount pad, other end free vibration is made the movable contact spring upper surface and is come the flow path direction cavity surface concordant, and its mode of vibration is through design of Simulation.Do the bottom of movable contact spring and post piezoelectric ceramic piece as the exciting element.Piezoelectric ceramic piece driving power signal wire (SW) is connected with the piezoceramic high-voltage power supply special.Install for convenient, make movable contact spring and piezoelectric ceramic piece and be installed on the mount pad.The bottom of mount pad has the line hole, is connected with the bottom portion of groove of array, and signal wire (SW) is connected to piezoelectric ceramic piece by this hole, makes whole array compactness, and convenient the connection.
Described array groove is distributed in cavity in length and breadth at interval with array way and comes on the plane of flow path direction.
Described is metallic elastic component as movable contact spring, is installed in the array inside grooves.
Described piezoelectric ceramic piece is the thin part in the side of piezoceramic material, is attached to the bottom of making movable contact spring, is connected with the piezoceramic high-voltage power supply special by signal wire (SW).
Described dynamic pressure transducer is common dynamic pressure transducer, arranges along cavity bottom, and its signal is through amplifying, by the computer acquisition of A/D capture card and processing.
Described mount pad is a bottom opening, and an end is square of step shape.
During use, analyze behind the dynamic pressure signal of computer acquisition cavity bottom, obtain frequency response curve.By the comprehensive analyses to the signal on each sensor, computing machine sends each self-corresponding vibration energizing signal to the piezoelectric ceramic piece of array, after amplifying through the piezoceramic high-voltage power supply special, is sent to piezoelectric ceramic piece.Piezoelectric ceramic piece produces dilatation under galvanic action, and drives and to send vibration as movable contact spring, and then produces new disturbance in the cavity leading edge, and the shear layer of control cavity flows, and breaks the acoustic feed back that the shear layer disturbance forms in the downstream.When coming flow disturbance, computing machine is adjusted oscillation frequency in real time according to the sensor signal of gathering, and guarantees the robustness of system.
Compare with existing aerodynamics noise inhibition means, apparatus of the present invention are simple in structure, and speed of response is fast, and energy consumption is low; By arranging of vibration excitor, improved the load-carrying capacity of vibration excitor, can be used for high velocity air, the reliability height; By adjusting arranging of vibration excitor, enlarge range of control; Consider the three-dimensional character of incoming flow irregularity and cavity, be easy to realize the mobile phased array accuracy control that carries out of space three-dimensional.When coming flow disturbance, computing machine is adjusted oscillation frequency in real time according to sensor signal, has guaranteed the robustness of system.The noise that can suppress 30dB at most.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: array groove 1, make movable contact spring 2, piezoelectric ceramic piece 3, piezoceramic high-voltage power supply special 4, the computing machine 5 of being furnished with the A/D capture card, dynamic pressure transducer 6 and mount pad 7.Array groove 1 is distributed in cavity and comes on the plane of flow path direction.Make movable contact spring 2 one ends and be fixed on the mount pad 7, but other end free vibration is made movable contact spring 2 upper surfaces and come the flow path direction cavity surface concordant, its mode of vibration process design of Simulation.Piezoelectric ceramic piece 3 upper surfaces are attached to the bottom of making movable contact spring 2, and the end is fixed on the mount pad 7.Mount pad 7 is with the bottom of screw retention in array groove 1, and piezoelectric ceramic piece 3 is connected with piezoceramic high-voltage power supply special 4 by signal wire (SW).Dynamic pressure transducer 6 is installed in along cavity bottom, is connected with the computing machine 5 of being furnished with the A/D capture card.
Described array groove 1 is distributed in cavity in length and breadth at interval by array way and comes on the plane of flow path direction.
The described movable contact spring 2 of doing is metallic elastic component, is installed in array groove 1 inside.
Described piezoelectric ceramic piece 3 is thin parts in side of piezoceramic material.
Described piezoceramic high-voltage power supply special 4 is for driving the high-voltage power supply special that piezoelectric ceramic piece activates.
Described dynamic pressure transducer 6 distributes along line of centers and is installed in along cavity bottom, and its signal is furnished with the computing machine 5 of A/D capture card and gathers and handle through amplifying.
Described mount pad 7 is a bottom opening, and an end is square of step shape, with screw retention in array groove 1 bottom.
The described movable contact spring 2 of doing is metallic elastic component, and an end is fixed on the terrace of appearing on the stage of mount pad 7, and piezoelectric ceramic piece 3 ends are fixed on the leave from office terrace of mount pad 7.
During work, the dynamic pressure transducer 6 of cavity bottom receives the pulsating pressure signal, is sent to computing machine 5 by capture card.Computing machine 5 is analyzed the signal on each sensor, and then the piezoelectric ceramic piece 3 of array is sent cooresponding vibration energizing signal, after amplifying through piezoceramic high-voltage power supply special 4, is sent to piezoelectric ceramic piece 3.Piezoelectric ceramic piece 3 produces dilatation under galvanic action, and drives and to make movable contact spring 2 and send vibration, and then produces new disturbance in the cavity leading edge, and the shear layer of control cavity flows, and breaks the acoustic feed back that the shear layer disturbance forms in the downstream.When coming flow disturbance, computing machine 5 is adjusted oscillation frequency in real time according to the sensor signal of gathering, and guarantees the robustness of system.
Present embodiment at work, based on cavity self sustained oscillation and flow control principle thereof.The shear layer fugitiveness that cavity flows makes the disturbance of flowing to the starting stage very responsive, and initial disturbance is had the strong nonlinear amplification, and therefore the control disturbance that comes laminar boundary layer suppresses to have material impact to the development and the cavity vibration of downstream shear layer.Present embodiment passes through the analysis to the pulsating pressure signal of cavity bottom, output drive signal, the vibration of control multilayer actuation element, come laminar boundary layer to disturb to the cavity leading edge, change the shear layer oscillation frequency, break resonance, reach the purpose that suppresses the cavity aerodynamics noise.
The noise closed loop ACTIVE CONTROL energy consumption that present embodiment carried out is low, high efficiency; The speed of incoming flow that can adapt in a big way changes; Volume is little, reliability height, stable performance.
Claims (7)
1, a kind of three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition device, it is characterized in that, comprise: array groove (1), exciting reed (2), piezoelectric ceramic piece (3), piezoceramic high-voltage power supply special (4), the computing machine (5) of being furnished with the A/D capture card, dynamic pressure transducer (6), mount pad (7), wherein: array groove (1) is distributed in cavity and comes on the plane of flow path direction, making movable contact spring (2) one ends is fixed on the mount pad (7), other end free vibration, make movable contact spring (2) upper surface and come the flow path direction cavity surface concordant, piezoelectric ceramic piece (3) upper surface is attached to the bottom of doing movable contact spring (2), the end is fixed on the mount pad (7), the signal wire (SW) of piezoelectric ceramic piece (3) is connected with piezoceramic high-voltage power supply special (4), mount pad (7) is fixed in the bottom of array groove (1), dynamic pressure transducer (6) is installed in cavity bottom, and is connected with the computing machine of being furnished with the A/D capture card (5).
2, three-dimensional cavity resonance pulsating pressure according to claim 1 and aerodynamic noise inhibition device is characterized in that, described array groove (1) is distributed on the incoming flow surface at interval in length and breadth with array way.
3, three-dimensional cavity resonance pulsating pressure according to claim 2 and aerodynamic noise inhibition device is characterized in that, the described movable contact spring (2) of doing is a metallic elastic component, is installed in array groove (1) inside.
4, three-dimensional cavity resonance pulsating pressure according to claim 1 and aerodynamic noise inhibition device, it is characterized in that, described dynamic pressure transducer (6) distributes along line of centers and is installed in cavity bottom, measure sound pressure signal in real time, its signal is furnished with the computing machine (5) of A/D capture card and gathers and handle through amplifying.
5, according to claim 1 or 4 described three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition devices, it is characterized in that, described computing machine (5) is analyzed dynamic pressure transducer (6) signal, after passing through to piezoceramic high-voltage power supply special (4) and amplifying, triggers piezoelectric ceramic piece (3) in real time.
6, three-dimensional cavity resonance pulsating pressure according to claim 1 and aerodynamic noise inhibition device is characterized in that, described mount pad (7) is a bottom opening, and an end is square of step shape.
7, according to claim 1 or 6 described three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition devices, it is characterized in that, the described movable contact spring (2) of doing is a metallic elastic component, one end is fixed on the terrace of appearing on the stage of mount pad (7), and piezoelectric ceramic piece (3) end is fixed on the leave from office terrace of mount pad (7).
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085918A (en) * | 2010-12-31 | 2011-06-08 | 北京控制工程研究所 | Binary intelligent structure control device of satellite flexible vibration |
| CN103625639A (en) * | 2013-09-25 | 2014-03-12 | 中国商用飞机有限责任公司 | Noise control method for leading edge slat of airplane |
| CN105280199A (en) * | 2015-10-27 | 2016-01-27 | 武汉大学 | Acoustic pressure control based hard disk magnetic head vibration suppression method and apparatus |
| CN106864737A (en) * | 2017-01-20 | 2017-06-20 | 西北工业大学 | A kind of deformable cavities device |
| CN107314849A (en) * | 2017-08-21 | 2017-11-03 | 哈尔滨工业大学（威海） | A kind of sensor with the small high frequency Cutting Force Signal measurement capability of three-dimensional |
| CN108287948A (en) * | 2017-12-29 | 2018-07-17 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of cavity multi- scenarios method equation and boundary condition method for building up |
| CN108482641A (en) * | 2018-03-22 | 2018-09-04 | 中国空气动力研究与发展中心高速空气动力研究所 | The damping layer and rear wall relief tube fabricated structure of cabin aerodynamic noise are buried in a kind of reduction |
| CN109697971A (en) * | 2018-12-28 | 2019-04-30 | 西南交通大学 | A kind of automobile noise reduction system and method based on plasma |
| CN111625905A (en) * | 2020-05-29 | 2020-09-04 | 中国航空工业集团公司西安飞机设计研究所 | High-frequency simulation method for noise in propeller aircraft cabin |
| CN112623196A (en) * | 2020-12-29 | 2021-04-09 | 中国航空工业集团公司西安飞机设计研究所 | Cavity noise control method |
| CN113270084A (en) * | 2021-05-12 | 2021-08-17 | 中国航空工业集团公司沈阳空气动力研究所 | Noise reduction device and method for aircraft cavity based on sound absorption material |
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2008
- 2008-05-08 CN CNA2008100370997A patent/CN101264798A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085918B (en) * | 2010-12-31 | 2013-03-13 | 北京控制工程研究所 | Binary intelligent structure control device of satellite flexible vibration |
| CN102085918A (en) * | 2010-12-31 | 2011-06-08 | 北京控制工程研究所 | Binary intelligent structure control device of satellite flexible vibration |
| CN103625639A (en) * | 2013-09-25 | 2014-03-12 | 中国商用飞机有限责任公司 | Noise control method for leading edge slat of airplane |
| WO2015043074A1 (en) * | 2013-09-25 | 2015-04-02 | 中国商用飞机有限责任公司 | Method of controlling noise on aircraft leading-edge slat |
| CN105280199A (en) * | 2015-10-27 | 2016-01-27 | 武汉大学 | Acoustic pressure control based hard disk magnetic head vibration suppression method and apparatus |
| CN105280199B (en) * | 2015-10-27 | 2019-01-18 | 武汉大学 | A kind of hard disc magnetic head vibration suppressing method and device based on acoustic pressure control |
| CN106864737B (en) * | 2017-01-20 | 2019-07-05 | 西北工业大学 | A kind of deformable cavities device |
| CN106864737A (en) * | 2017-01-20 | 2017-06-20 | 西北工业大学 | A kind of deformable cavities device |
| CN107314849A (en) * | 2017-08-21 | 2017-11-03 | 哈尔滨工业大学（威海） | A kind of sensor with the small high frequency Cutting Force Signal measurement capability of three-dimensional |
| CN108287948A (en) * | 2017-12-29 | 2018-07-17 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of cavity multi- scenarios method equation and boundary condition method for building up |
| CN108287948B (en) * | 2017-12-29 | 2021-09-24 | 中国空气动力研究与发展中心高速空气动力研究所 | Boundary condition establishing method based on cavity multi-field coupling equation |
| CN108482641A (en) * | 2018-03-22 | 2018-09-04 | 中国空气动力研究与发展中心高速空气动力研究所 | The damping layer and rear wall relief tube fabricated structure of cabin aerodynamic noise are buried in a kind of reduction |
| CN108482641B (en) * | 2018-03-22 | 2020-06-30 | 中国空气动力研究与发展中心高速空气动力研究所 | Damping layer and rear wall pressure relief pipe combined structure for reducing pneumatic noise of embedded cabin |
| CN109697971B (en) * | 2018-12-28 | 2021-04-13 | 西南交通大学 | Plasma-based automobile noise reduction system and method |
| CN109697971A (en) * | 2018-12-28 | 2019-04-30 | 西南交通大学 | A kind of automobile noise reduction system and method based on plasma |
| CN111625905A (en) * | 2020-05-29 | 2020-09-04 | 中国航空工业集团公司西安飞机设计研究所 | High-frequency simulation method for noise in propeller aircraft cabin |
| CN111625905B (en) * | 2020-05-29 | 2023-08-04 | 中国航空工业集团公司西安飞机设计研究所 | High-frequency simulation method for noise in cabin of propeller aircraft |
| CN112623196A (en) * | 2020-12-29 | 2021-04-09 | 中国航空工业集团公司西安飞机设计研究所 | Cavity noise control method |
| CN113270084A (en) * | 2021-05-12 | 2021-08-17 | 中国航空工业集团公司沈阳空气动力研究所 | Noise reduction device and method for aircraft cavity based on sound absorption material |
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