CN102477883A - Driving silencer - Google Patents
Driving silencer Download PDFInfo
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- CN102477883A CN102477883A CN201010558403XA CN201010558403A CN102477883A CN 102477883 A CN102477883 A CN 102477883A CN 201010558403X A CN201010558403X A CN 201010558403XA CN 201010558403 A CN201010558403 A CN 201010558403A CN 102477883 A CN102477883 A CN 102477883A
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- sound pressure
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- pressure sensor
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Abstract
The invention relates to a driving silencer. The silencer comprises a shell, wherein the shell is cylindrical, a porous material layer is axially vertically arranged in the cylindrical shell, two sound pressure sensors are arranged in the shell positioned on one side of the porous material layer, a disc-shaped rigid plate is arranged in the shell positioned on the other side of the porous material layer, and the rigid plate and the inner wall of the shell are in clearance fit; and signal wires of a first sound pressure sensor and a second sound pressure sensor are connected with an amplifier and a controller through wires. The two sound pressure sensors are arranged in the driving silencer and used for carrying out detection on sound pressure in the cylindrical silencer, the signal is amplified by the amplifier so as to input the controller, and the controller calculates supposed moving distance of the motional rigid plate; at that time, a stepping motor driven by a driver of the stepping motor leads a movable rigid wall to move the expectative displacement, therefore, the acoustic impedance on the surface of a porous sound-absorbing material is matched with that of the inner air of the silencer, thereby achieving the purpose of actively eliminating noise.
Description
Technical field
The present invention relates to vehicle, particularly Vehicular vibration and Noise Control Device specifically are a kind of active silencing apparatuss.
Background technique
Silencing apparatus is a kind of resulting structure that reduces the vehicle motor noise, and its kind is a lot, by its noise elimination mechanism, can be divided into dissipative muffler, reactive muffler and impedance muffler etc.The noise-cancelling theory of dissipative muffler is the sound-absorbing material that utilizes in the pipeline, partly absorbs the acoustic energy along pipe transmmision.Reactive muffler is pipeline and perforated pipe resonance sound-absorbing structure of utilizing different shape, size etc., causes sound wave in system's middle impedance mismatch, makes sound wave in pipeline and resonant cavity, come back reflective, consume, thereby reaches the purpose of noise elimination.Impedance muffler is that dissipative muffler and reactive muffler are combined, thereby realizes the purpose that wideband is eliminated the noise.Existing silencing apparatus is nothing more than top said several kinds of silencing apparatuss, but they all are passive silencing apparatuss, and the silencing apparatus performance is passive.The noise of motor is a kind of random noise, and its noise frequency is often to change, and frequency range is indefinite, therefore, with these passive silencing apparatuss motor is carried out noise reduction, and acoustic attenuation performance does not just reach the set goal.
Summary of the invention
The object of the present invention is to provide a kind of active silencing apparatus, described this active silencing apparatus will solve that silencing apparatus is passive silencing apparatus in the existing technology, can not regulate with the engine noise frequency, thereby cause the bad technical problem of its noise elimination effect.
The objective of the invention is to realize: comprise cylindrical circular shell through following technological scheme; In this cylindrical housing, axially be provided with porous material layer along it perpendicularly; This porous material layer is disc, and airtight closing is connected between porous material layer edge and outer casing inner wall, and the shell that is positioned at porous material layer one side is provided with two sound pressure sensors; These two sound pressure sensors along enclosure axis to setting; The distance of second sound pressure sensor and porous material layer equals the distance between first sound pressure sensor and second sound pressure sensor, and the shell that is positioned at the porous material layer opposite side is provided with a discoidal rigid plate, rigid plate and outer casing inner wall Spielpassung; The signaling line of first sound pressure sensor and second sound pressure sensor is connected with controller with amplifier through lead; Controller is connected with motor driver, and motor driver links to each other with motor, and motor output shaft is connected with rigid plate through transmission device.
The distance of second sound pressure sensor and porous material layer is 20mm.
Sound pressure sensor is a MIC microphone.
Motor is a stepper motor.
The stepper motor output shaft is connected with a rhizoid thick stick; Leading screw cooperates with a nut; Be fixedly linked with nut and be provided with a vertical rod member; Offer an axial groove at the cylindrical housing sidewall, this vertical rod member stretches in the groove along the radial direction of cylindrical housing, and vertically rod member is connected with rigid plate through horizontal bars.
Establish a support plate on the horizontal bars, the support plate disc, support plate and horizontal bars are connected to a fixed, and are provided with between support plate and outer casing inner wall along its axial sliding pair.
Porous material layer is the composite rock wool plate.
Controller is a computer.
The present invention compares with prior art, and its effect is actively with tangible.Two sound pressure sensors are set in this active silencing apparatus; Acoustic pressure in order in cylindrical shape is eliminated the noise detects; This signal amplifies the back input controller by putting device, and controller calculates sets out the distance that rigid plate should move, and make removable rigid walls move to the displacement of expection through the stepper motor driver drive stepping motor this moment; Make the acoustic impedance on sound-absorbing porous material surface and the acoustic impedance of silencing apparatus inner air be complementary, reach the purpose that wideband is initiatively eliminated the noise.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the A-A sectional drawing among Fig. 1.
Fig. 3 is the B-B sectional drawing among Fig. 1.
Fig. 4 carries out incident sound pressure and reflecting acoustic pressure schematic diagram calculation in the controller of the present invention.
Embodiment
Through embodiment the present invention is done further explain below in conjunction with accompanying drawing.
Like Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, comprise cylindrical circular shell 1, in this cylindrical housing 1, axially be provided with porous material layer 2 along it perpendicularly; Porous material layer 2 is the composite rock wool plate, and this porous material layer is disc, and airtight closing is connected between porous material layer 2 edges and shell 1 inwall; Porous material layer 2 matches with the draw-in groove of outer casing inner wall through three projections of circumferencial direction, and the shell 1 that is positioned at porous material layer 2 one sides is provided with two MIC microphones 3,4; These two MIC microphones 3,4 axially are provided with along shell 1, and second MIC microphone 4 is nearer apart from porous material layer; Second MIC microphone 4 is 20mm with the distance of porous material layer 2, and the distance of second MIC microphone 4 and porous material layer 2 equals the distance between first MIC microphone 3 and second MIC microphone 4, and the shell 1 that is positioned at porous material layer 2 opposite sides is provided with a discoidal rigid plate 5; Rigid plate 5 and shell 1 inwall Spielpassung, the signaling line of first MIC microphone 3 and second MIC microphone 4 is connected with computer 7 with amplifier 6 through lead, and computer 7 is connected with stepper motor driver 8; Stepper motor driver 8 links to each other with stepper motor 9, and stepper motor 9 output shafts are connected with a rhizoid thick stick 10, and leading screw 10 cooperates with a nut 11; Be fixedly linked with nut 11 and be provided with 12 on a vertical bar; Offer an axial groove 13 at the cylindrical housing sidewall, 12 radial directions along cylindrical housing of this vertical bar stretch in the groove 13, and vertically 12 on bar is connected with rigid plate 5 through horizontal bars 14; Establish a support plate 15 on the horizontal bars 14; Support plate 15 discs, support plate 15 is connected to a fixed with horizontal bars, is provided with along its axial sliding pair between support plate 15 and shell 1 inwall.
During concrete work; Two Mike's wind actions are equivalent to sensor; The sound pressure signal that gets at two MIC microphone places is delivered to signal acquiring system; Signal acquiring system is connected to computer; Computer Processing obtains the incident sound wave frequency; And the time lag that the sound pressure signal that gets at two MIC microphone places passes through
respectively (wherein;
;
is two distances between the MIC microphone; The speed that
propagates in air for sound wave); And carry out incident sound pressure and the reflecting acoustic pressure that corresponding calculated obtains the sound-absorbing porous material surface, just can obtain the acoustic absorptivity on sound-absorbing porous material surface.If the incident sound wave frequency is when being in high frequency; The removable rigid walls that is arranged in the sound-absorbing porous material back side this moment does not move; This absorbs sound in the good characteristics of high frequency sound absorbing capabilities to rely on sound-absorbing porous material, reaches the purpose of noise elimination, if the incident sound wave frequency be in, low frequency; This moment, COMPUTER CALCULATION obtained sound-absorbing porous material cavity depth behind, thereby calculated the distance that removable rigid walls need move.Computer is connected to stepper motor driver; Stepper motor driver is connected to stepper motor; The angular displacement of stepper motor is converted into the linear displacement of removable rigid walls through leading screw and pair of nut; Make the acoustic impedance on sound-absorbing porous material surface and the acoustic impedance of silencing apparatus inner air be complementary, reach the purpose that wideband is initiatively eliminated the noise.
According to the schematic diagram of Fig. 4, its computational process is following.
The incident sound pressure of simple harmonic quantity plane sound wave is
among Fig. 4; Two MIC microphones and sound-absorbing material are equidistantly arranged; Mutual spacing is
; If true origin is positioned at first MIC microphone place, direction is to the right a postive direction.Because the front supposed that the far field sound wave is the simple harmonic quantity plane sound wave, so incident acoustic wave and reflective sound wave can be expressed as:
Definition
is:
Will
Delay
get
:
In like manner; The time-delay
with
obtains:
（8）
Definition
is:
Getting sound pressure reflection coefficient
by formula (7) (9) is:
According to the sound pressure reflection coefficient
of formula (10) gained, the acoustic absorptivity
that can obtain sound-absorbing material is:
The formula
means
the conjugate transpose.
Change the surperficial acoustic impedance of sound-absorbing material through moving rigid walls, thereby change acoustic absorptivity, and this acoustic absorptivity is calculated by top formula.
Except such scheme, many places of the present invention structure can also many distortion.Such as, porous material layer can also adopt other resistant to elevated temperatures sound-absorbing material, and such as mineral rock cotton board or the like, drive motor also can adopt direct current generator, and transmission device can adopt the worm and gear device, also can adopt gear & rack structure.
Claims (8)
1. silencing apparatus initiatively; Comprise cylindrical circular shell, it is characterized in that: in this cylindrical housing, axially be provided with porous material layer along it, this porous material layer is disc perpendicularly; Airtight closing is connected between porous material layer edge and outer casing inner wall; The shell that is positioned at porous material layer one side is provided with two sound pressure sensors, and to setting, the distance of second sound pressure sensor and porous material layer equals the distance between first sound pressure sensor and second sound pressure sensor to these two sound pressure sensors along enclosure axis; The shell that is positioned at the porous material layer opposite side is provided with a discoidal rigid plate; Rigid plate and outer casing inner wall Spielpassung, the signaling line of first sound pressure sensor and second sound pressure sensor is connected with controller with amplifier through lead, and controller is connected with motor driver; Motor driver links to each other with motor, and motor output shaft is connected with rigid plate through transmission device.
2. active silencing apparatus as claimed in claim 1 is characterized in that: the distance of second sound pressure sensor and porous material layer is 20mm.
3. active silencing apparatus as claimed in claim 2 is characterized in that: sound pressure sensor is a MIC microphone.
4. active silencing apparatus as claimed in claim 1 is characterized in that: motor is a stepper motor.
5. active silencing apparatus as claimed in claim 4; It is characterized in that: the stepper motor output shaft is connected with a rhizoid thick stick; Leading screw cooperates with a nut, and being fixedly linked with nut is provided with a vertical rod member, offers an axial groove at the cylindrical housing sidewall; This vertical rod member stretches in the groove along the radial direction of cylindrical housing, and vertically rod member is connected with rigid plate through horizontal bars.
6. active silencing apparatus as claimed in claim 5 is characterized in that: establish a support plate on the horizontal bars, and the support plate disc, support plate and horizontal bars are connected to a fixed, and are provided with between support plate and outer casing inner wall along its axial sliding pair.
7. active silencing apparatus as claimed in claim 1 is characterized in that: porous material layer is the composite rock wool plate.
8. active silencing apparatus as claimed in claim 1 is characterized in that: controller is a computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010558403XA CN102477883A (en) | 2010-11-25 | 2010-11-25 | Driving silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010558403XA CN102477883A (en) | 2010-11-25 | 2010-11-25 | Driving silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102477883A true CN102477883A (en) | 2012-05-30 |
Family
ID=46090645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010558403XA Pending CN102477883A (en) | 2010-11-25 | 2010-11-25 | Driving silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102477883A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246306A (en) * | 2017-08-09 | 2017-10-13 | 安徽江淮汽车集团股份有限公司 | A kind of muffler ASSY |
| CN107972535A (en) * | 2016-10-21 | 2018-05-01 | 福特全球技术公司 | The system and method that variable acoustic suppresses in adjustable seat |
| CN110318845A (en) * | 2018-03-30 | 2019-10-11 | 现代自动车株式会社 | Silencer and its control method with removable baffle plate |
| CN110397528A (en) * | 2019-07-29 | 2019-11-01 | 浙江吉利新能源商用车集团有限公司 | Sound-attenuating system, sound reduction method and vehicle for air inlet system and exhaust system |
| CN112628517A (en) * | 2020-12-11 | 2021-04-09 | 南京光声超构材料研究院有限公司 | Pipeline silencer, device and manufacturing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08189327A (en) * | 1994-12-28 | 1996-07-23 | Nissan Motor Co Ltd | Muffler |
| CN1651726A (en) * | 2005-02-18 | 2005-08-10 | 中国船舶重工集团公司第七一一研究所 | Adaptive active control silencer |
| CN1834415A (en) * | 2006-04-21 | 2006-09-20 | 中原工学院 | Noise reducing muffle of engine |
-
2010
- 2010-11-25 CN CN201010558403XA patent/CN102477883A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08189327A (en) * | 1994-12-28 | 1996-07-23 | Nissan Motor Co Ltd | Muffler |
| CN1651726A (en) * | 2005-02-18 | 2005-08-10 | 中国船舶重工集团公司第七一一研究所 | Adaptive active control silencer |
| CN1834415A (en) * | 2006-04-21 | 2006-09-20 | 中原工学院 | Noise reducing muffle of engine |
Non-Patent Citations (5)
| Title |
|---|
| 朱从云, 赵则祥, 李春广, 黄其柏,: "噪声控制研究进展与展望", 《噪声与振动控制》, no. 3, 30 June 2007 (2007-06-30), pages 1 - 8 * |
| 朱从云,黄其柏,: "基于特性阻抗的测量吸声系数的一种新方法", 《机械设计与制造》, no. 8, 31 August 2008 (2008-08-31), pages 154 - 156 * |
| 朱从云,黄其柏,: "微穿孔板的主动吸声研究", 《机械设计与制造》, no. 4, 31 August 2004 (2004-08-31), pages 38 - 40 * |
| 朱从云,黄其柏,许志云,张均平,: "基于特性阻抗的半主动吸声研究", 《噪声与振动控制》, no. 2, 30 April 2004 (2004-04-30) * |
| 黄其柏, 朱从云,徐志云, 张均平,: "基于压电材料的主动吸声降噪方法研究", 《噪声与振动控制》, no. 6, 31 December 2004 (2004-12-31), pages 7 - 10 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107972535A (en) * | 2016-10-21 | 2018-05-01 | 福特全球技术公司 | The system and method that variable acoustic suppresses in adjustable seat |
| CN107246306A (en) * | 2017-08-09 | 2017-10-13 | 安徽江淮汽车集团股份有限公司 | A kind of muffler ASSY |
| CN107246306B (en) * | 2017-08-09 | 2019-09-24 | 安徽江淮汽车集团股份有限公司 | A kind of muffler ASSY |
| CN110318845A (en) * | 2018-03-30 | 2019-10-11 | 现代自动车株式会社 | Silencer and its control method with removable baffle plate |
| US11319858B2 (en) | 2018-03-30 | 2022-05-03 | Hyundai Motor Company | Muffler having movable baffle and control method of the same |
| CN110397528A (en) * | 2019-07-29 | 2019-11-01 | 浙江吉利新能源商用车集团有限公司 | Sound-attenuating system, sound reduction method and vehicle for air inlet system and exhaust system |
| CN112628517A (en) * | 2020-12-11 | 2021-04-09 | 南京光声超构材料研究院有限公司 | Pipeline silencer, device and manufacturing method |
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Application publication date: 20120530 |