CN101540167A - Self-adapting frequency modulation semi-active noise control device - Google Patents
Self-adapting frequency modulation semi-active noise control device Download PDFInfo
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- CN101540167A CN101540167A CN200910071703A CN200910071703A CN101540167A CN 101540167 A CN101540167 A CN 101540167A CN 200910071703 A CN200910071703 A CN 200910071703A CN 200910071703 A CN200910071703 A CN 200910071703A CN 101540167 A CN101540167 A CN 101540167A
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Abstract
The invention provides a self-adapting frequency modulation semi-active noise control device which comprises a controlled enclosed sound field 1, a sound conducting apparatus 3, a sound conducting apparatus 4, a band-pass filter 5, a DSP controller 6, a stepper motor driver 7, a DC power supply 8, a stepper motor 9 and a semi-active vibration absorber 2. An enclosed system 1 is provided with a semi-active vibration absorber- helmholtz resonator 2, the sound conducting apparatus 3 is used for measuring a sound pressure signal inside the helmholtz resonator, and the sound conducting apparatus 4 is used for measuring a sound pressure signal at an opening of the helmholtz resonator; the two signals simultaneously pass through the band-pass filter 5 and are switched in the DSP controller 6 by a signal output by the filter 5. The invention can be regulated in real time, meets the requirements of track excitation frequency, and ensures the overall performance of an acoustical damper to be effectively improved.
Description
(1) technical field
What the present invention relates to is a kind of enclosure space (cabin) noise control technique, particularly a kind of self-adapting frequency modulation semi-active noise control device based on the dot product control algolithm.
(2) background technology
Indoor or cabin noise more and more is subject to people's attention as an important environmental pollution.It all is a very important job that indoor or cabin noise is controlled at the military and civilian field.Utilizing Helmholtz resonator sound absorption is a widely used sqouynd absorption lowering noise technology, because it is simple in structure, the effective less noise of controlled frequency variation range is implemented the important means that noise is controlled so Helmholtz resonator has become again.Yet the sound absorption frequency of traditional Helmholtz resonator is just determined at the beginning of design, can not be changed with the variation of excitation frequency and system performance, therefore, when noise source or sound field excitation frequency changed, its sound absorbing capabilities will reduce greatly, even does not have the effect of sound absorption.The Helmholtz resonator that parameter is adjustable belongs to half Active Absorption technology category, and it has advantages such as control system is simple relatively, cost is lower, reliable, than the engineering practical application of being more convenient for of Active Absorption technology, has obtained extensive studies.By changing the parameter of sound absorber, neck area, neck length and resonant cavity volume wait the sound absorption frequency and the sound absorption characteristics of regulating resonator, make the engineering actual application prospect of sound absorber bigger.
Yet the key link of half active noise control technique is half ACTIVE CONTROL algorithm, promptly passes through and so on the online adjusting that control method and CONTROL LAW DESIGN can realize the sound absorber parameter.Do not have half ACTIVE CONTROL algorithm, just can not reach the purpose of half ACTIVE CONTROL, can only pass through manual adjustments.
(3) summary of the invention
The object of the present invention is to provide a kind of automatic adjusting that can realize sound absorber sound absorption frequency, thus a kind of self-adapting frequency modulation semi-active noise control device of half ACTIVE CONTROL of implementation space noise etc.
The object of the present invention is achieved like this:
The composition of self-adapting frequency modulation semi-active noise control device of the present invention is included in and goes up semi active vibration absorber-Helmholtz resonator 2 of installing in the closed system 1, in sealing sound field 1, first microphone 3 is set, second microphone 4, first microphone 3 measures the inner sound pressure signal of its Helmholtz resonator, second microphone 4 measures Helmholtz resonator opening part sound pressure signal, the output connecting band bandpass filter 5 of first microphone 3 and second microphone 4, the output of bandpass filter 5 connects dsp controller 6, dsp controller 6 control step motor drivers 7, stepper motor driver 7 control step motors 9, stepper motor driver 7 also links to each other with direct supply 8.
Compared with prior art, the invention has the advantages that:
At first, the present invention can monitor the variation of the sound pressure signal of enclosure space automatically, come the rotation of control step motor to adjust the resonant frequency of sound absorber by the size of judging the dot product value, make the resonant frequency of sound absorber be consistent with the excitation frequency all the time, make the control effect of sound absorber be in the best all the time.
Secondly, controller of the present invention is DSP, its remarkable arithmetic speed makes that half ACTIVE CONTROL System response time among the present invention is rapid, can catch the excitation signal fast changes and the duty that changes half Active Absorption device fast, so the System response time of half ACTIVE CONTROL system is shorter, can in time track the excitation frequency, thereby make the best effect of sound absorber performance.
In sum, the invention provides a kind of self-adaptive frequency modulation semi-active noise control method, and can carry out real-time adjustment, can satisfy the requirement for track excitation frequency, the overall performance of the sound absorber behind use the present invention can both be effectively improved.
(4) description of drawings
Fig. 1 is the synoptic diagram of half Active Absorption device adaptive control system of the present invention;
Fig. 2 is the present invention's half Active Absorption device adaptive control system process flow diagram;
Half active noise controlling effect in enclosure space when Fig. 3 (a)-Fig. 3 (c) 242Hz encourages, wherein:
The sound pressure amplitude control curve of the interior half Active Absorption device opening part of Fig. 3 (a) enclosure space,
The change curve of Fig. 3 (b) sound absorber opening diameter,
Fig. 3 (c) dot product value change curve;
Half active noise controlling effect in enclosure space during Figure 42 12Hz excitation, wherein:
The sound pressure amplitude control curve of the interior half Active Absorption device opening part of Fig. 4 (a) enclosure space,
The change curve of Fig. 4 (b) sound absorber opening diameter,
Fig. 4 (c) dot product value change curve.
(5) embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1, the composition of self-adapting frequency modulation semi-active noise control device comprises: as controlled sealing sound field 1; Microphone 3, microphone 4, bandpass filter 5, dsp controller 6, stepper motor driver 7, direct supply 8, stepper motor 9 and semi active vibration absorber 2 have constituted half active noise controlling system.Semi active vibration absorber-Helmholtz resonator 2 has been installed in the closed system 1, and measured the inner sound pressure signal of its Helmholtz resonator by microphone 3, and microphone 4 measures Helmholtz resonator opening part sound pressure signal, two signals are simultaneously by in the bandpass filter 5, in the signal access dsp controller 6 by output in the wave filter 5.
Control program in the dsp controller 6 carries out dot product to these two signals and handles according to two signals of input, judges the size of the dot product value that adds up, and the corresponding pulse control signal of output is given stepper motor driver 7 after the computing, thus drive stepping motor 9 runnings.Stepper motor 9 changes the aperture area of Helmholtz resonator 2 by corresponding topworks, thereby changes the resonant frequency of Helmholtz resonator 2, makes it to be tending towards the excitation frequency.
In conjunction with Fig. 2, the realization to the some integration method among the present invention is described in detail below:
Excitation frequency in the sealing sound field 1 changes, and makes the acoustically effective that is in half Active Absorption device-Helmholtz resonator 2 wherein weaken.The point integration method carries out normalized earlier to Helmholtz resonator 2 opening parts and inner two sound pressure signals, and product adds up mutually in the whole cycle.Dsp controller 6 sends corresponding pulse control signal according to the size of the dot product value that adds up to stepper motor driver 7.
1) when adding up the dot product value greater than zero the time, dsp controller 6 sends the forward deflection vein to stepper motor driver 7 and dashes and the pulse signal of advancing accordingly, stepper motor 9 is just changeing, by corresponding topworks the neck opening area of Helmholtz resonator 2 is diminished, thereby lower the resonant frequency of Helmholtz resonator 2.
2) when adding up the dot product value less than zero the time, dsp controller 6 sends the counter steering pulse and the pulse signal of advancing accordingly to stepper motor driver 7, stepper motor 9 counter-rotatings, make the neck opening area of Helmholtz resonator 2 become big by corresponding topworks, thereby the resonant frequency of Helmholtz resonator 2 is increased.
3) when the dot product value that adds up goes to zero, dsp controller 6 does not send deflection vein to stepper motor driver 7 and dashes and the pulse signal of advancing accordingly, stepper motor 9 stalls, and the neck opening area and the resonant frequency of Helmholtz resonator 2 remain unchanged.
When the dot product value that adds up went to zero, the resonant frequency of Helmholtz resonator 2 was constant, illustrated that its resonant frequency trends towards the excitation frequency, and whole half active noise controlling system tracks the variation of excitation frequency accurately.
Verify the validity of semi-active noise control method of the present invention by an example.Used enclosure space size in the experiment: long L
1=0.82m, wide L
2=0.72m, high L
3=0.6m.H.R. adopt organic glass to make.H.R. cavity is one section plexi-glass tubular, and external diameter is 90mm, and internal diameter is 80mm, and length is 200mm.The volume ratio of the whole H.R. and the operatic tunes is about 0.28%.242Hz and 212Hz are the natural frequency of this enclosure space, and therefore, the sound field when experiment is primarily aimed at these two frequency excitation is carried out noise control.
Half active noise controlling effect in enclosure space when Fig. 3 and Fig. 4 are respectively 242Hz and 212Hz excitation.As seen from Figure 3, acoustic pressure dot product value curve is tending towards 0, has reached desired value, and the diameter of H.R. opening is regulated last opening diameter through self-adaptation and is adjusted into 23.3mm by original 36mm.As calculated, the resonant frequency of H.R. is adjusted into 246.1Hz by 279Hz, basic excitation frequency near 242Hz.As seen from Figure 4, acoustic pressure dot product value curve is tending towards 0, has reached desired value, and the diameter of H.R. opening is regulated through self-adaptation by original 36mm, and last opening diameter is adjusted into 17.2mm.As calculated, the resonant frequency of H.R. is adjusted into 209.7Hz by 279Hz, basic excitation frequency near 212Hz.Thereby verified the validity of semi-active noise control method of the present invention.
Claims (1)
1, a kind of self-adapting frequency modulation semi-active noise control device, it is characterized in that: its composition is included in and goes up semi active vibration absorber-Helmholtz resonator [2] of installing in the closed system [1], in sealing sound field [1], first microphone [3] is set, second microphone [4], first microphone [3] measures the inner sound pressure signal of its Helmholtz resonator, second microphone [4] measures Helmholtz resonator opening part sound pressure signal, the output connecting band bandpass filter [5] of first microphone [3] and second microphone [4], the output of bandpass filter [5] connects dsp controller [6], dsp controller [6] control step motor driver [7], stepper motor driver [7] control step motor [9], stepper motor driver [7] also link to each other with direct supply [8].
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910071703A CN101540167A (en) | 2009-04-03 | 2009-04-03 | Self-adapting frequency modulation semi-active noise control device |
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| CN200910071703A CN101540167A (en) | 2009-04-03 | 2009-04-03 | Self-adapting frequency modulation semi-active noise control device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799110A (en) * | 2017-11-01 | 2018-03-13 | 南昌航空大学 | A kind of sweep-frequency Békésy audiometer Helmholtz silencer |
| CN111312202A (en) * | 2018-12-11 | 2020-06-19 | 上海汽车集团股份有限公司 | Silencing equipment |
| CN111981236A (en) * | 2020-07-14 | 2020-11-24 | 江苏科技大学 | Silencing device for actively modulating frequency and changing stop band and silencing method thereof |
| CN113162474A (en) * | 2021-04-29 | 2021-07-23 | 湘潭大学 | Noise power generation device and power generation method thereof |
| CN113539223A (en) * | 2021-07-11 | 2021-10-22 | 哈尔滨工程大学 | Helmholtz sound absorption device |
| CN115780227A (en) * | 2022-10-27 | 2023-03-14 | 西北核技术研究所 | Automatic frequency modulation acoustic effect cabin based on Helmholtz resonant cavity and frequency modulation method |
-
2009
- 2009-04-03 CN CN200910071703A patent/CN101540167A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799110A (en) * | 2017-11-01 | 2018-03-13 | 南昌航空大学 | A kind of sweep-frequency Békésy audiometer Helmholtz silencer |
| CN107799110B (en) * | 2017-11-01 | 2020-11-20 | 南昌航空大学 | Sweep frequency type Helmholtz silencer |
| CN111312202A (en) * | 2018-12-11 | 2020-06-19 | 上海汽车集团股份有限公司 | Silencing equipment |
| CN111312202B (en) * | 2018-12-11 | 2024-03-08 | 上海汽车集团股份有限公司 | Sound-deadening equipment |
| CN111981236A (en) * | 2020-07-14 | 2020-11-24 | 江苏科技大学 | Silencing device for actively modulating frequency and changing stop band and silencing method thereof |
| CN113162474A (en) * | 2021-04-29 | 2021-07-23 | 湘潭大学 | Noise power generation device and power generation method thereof |
| CN113162474B (en) * | 2021-04-29 | 2022-09-16 | 湘潭大学 | Noise power generation device and power generation method thereof |
| CN113539223A (en) * | 2021-07-11 | 2021-10-22 | 哈尔滨工程大学 | Helmholtz sound absorption device |
| CN113539223B (en) * | 2021-07-11 | 2022-05-06 | 哈尔滨工程大学 | Helmholtz sound absorption device |
| CN115780227A (en) * | 2022-10-27 | 2023-03-14 | 西北核技术研究所 | Automatic frequency modulation acoustic effect cabin based on Helmholtz resonant cavity and frequency modulation method |
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