CN110751938A - Helmholtz resonator and working method thereof - Google Patents
Helmholtz resonator and working method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 16
- 230000008859 change Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 6
- 230000030279 gene silencing Effects 0.000 claims description 4
- 230000008030 elimination Effects 0.000 abstract description 7
- 238000003379 elimination reaction Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- 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
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
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Abstract
The invention discloses a Helmholtz resonator, which comprises: the device comprises an air inlet pipeline, a main resonant cavity, a first neck short pipe, a second neck short pipe, a frequency modulation control module and an aperture adjusting assembly; the aperture adjusting component is arranged in the middle of the main resonant cavity and is coaxially connected with the main resonant cavity, and the main resonant cavity is divided into a first resonant cavity and a second resonant cavity; one end of the first neck short pipe is communicated with the air inlet pipeline, and the other end of the first neck short pipe is communicated with the first resonant cavity; one end of the second neck short pipe is communicated with the air inlet pipeline, and the other end of the second neck short pipe is communicated with the second resonant cavity; the input end of the frequency modulation control module is connected with the pipe wall of the gas inlet pipeline and communicated with the inside of the gas inlet pipeline, the output end of the frequency modulation control module is connected with the aperture adjusting assembly, and the frequency modulation control module is used for collecting the gas frequency in the gas inlet pipeline and adjusting the aperture of the aperture adjusting assembly based on the collected gas frequency. According to the invention, through the structure that the common aperture adjusting components of the two coupling resonant cavities are used for adjusting the aperture, the number of resonance peaks can be increased, and the noise elimination frequency band can be widened.
Description
Technical Field
The invention relates to the technical field of Helmholtz resonators, in particular to a Helmholtz resonator for frequency-broadening frequency-modulation coupling and a working method thereof.
Background
Although the helmholtz resonator is widely used because of its simple structure and high noise reduction, it has many disadvantages. First, generally, a helmholtz resonator having only a single resonance chamber has only one resonance peak, which has certain limitations, and cannot meet the requirement of noise elimination in a wider frequency band, so that combining a plurality of resonance chambers may be a method for obtaining a wider noise elimination frequency band, and therefore, in order to widen the damping frequency range, a plurality of helmholtz resonance chambers are generally used. Second, helmholtz resonators coupled under a common sidewall for two resonance chambers can form two resonance peaks, but still have two natural frequencies, and cannot be flexibly tuned. Finally, noise airflow mainly flows into the cavity through the neck in the helmholtz resonator and acoustic energy dissipation is carried out in the cavity, and in general, the sound attenuation frequency can be changed by adjusting the diameter of the neck of the resonator, but the sound attenuation frequency cannot be adjusted to be optimal within a certain range by adjusting the diameter of the neck of the resonator.
Disclosure of Invention
The invention provides a Helmholtz resonator and a working method thereof, which aim to solve the technical problem that the prior art cannot widen the silencing frequency band.
The present invention provides a helmholtz resonator including: the device comprises an air inlet pipeline, a main resonant cavity, a first neck short pipe, a second neck short pipe, a frequency modulation control module and an aperture adjusting assembly; the aperture adjusting component is arranged in the middle of the main resonant cavity and is coaxially connected with the main resonant cavity, and the main resonant cavity is divided into a first resonant cavity and a second resonant cavity; one end of the first neck short pipe is communicated with the air inlet pipeline, and the other end of the first neck short pipe is communicated with the first resonant cavity; one end of the second neck short pipe is communicated with the air inlet pipeline, and the other end of the second neck short pipe is communicated with the second resonant cavity; the input end of the frequency modulation control module is connected with the pipe wall of the air inlet pipeline and communicated with the inside of the air inlet pipeline, the output end of the frequency modulation control module is connected with the aperture adjusting assembly, and the frequency modulation control module is used for collecting the gas frequency in the air inlet pipeline and adjusting the aperture of the aperture adjusting assembly based on the collected gas frequency.
Further, the aperture adjusting assembly is an iris valve; the frequency modulation control module comprises a pressure sensor, a signal processor, a stepping motor controller and a stepping motor which are sequentially connected through signals; the pressure sensor is arranged on the inner wall of the air inlet pipeline and is used as an input end of the frequency modulation control module; and an output shaft of the stepping motor is connected with the diaphragm valve.
Further, the first neck spool has a length equal to a length of the second neck spool.
Further, the first neck spool has a pipe inner diameter equal to a pipe inner diameter of the second neck spool.
The invention also provides a working method of the Helmholtz resonator, which comprises the following specific steps:
step 1: the pressure sensor collects the pressure value of noise airflow in the air inlet pipeline to form a pressure wave signal and sends the pressure wave signal to the signal processor;
step 2: the signal processor converts the pressure wave signal into a frequency domain pulse signal and sends the frequency domain pulse signal to the stepping motor controller;
and step 3: the stepping motor controller controls the stepping motor to rotate forward and backward according to the frequency domain pulse signal, and the stepping motor drives the aperture valve to open and close to complete the adjustment of the silencing frequency band.
Further, in the step 1, the pressure sensor forms a pressure wave signal for the noise airflow pressure value in the air inlet pipeline at the sampling frequency of 1024 Hz.
Further, the specific steps of converting the pressure wave signal into the frequency domain pulse signal by the signal processor in the step 2 are as follows:
step 21: performing Fourier transform on the pressure wave signal acquired in the step 1 to form a frequency domain signal;
step 22: and extracting main noise frequency from the frequency domain signal to form a frequency domain pulse signal.
Further, the specific method for controlling the forward and reverse rotation of the stepping motor by the stepping motor controller according to the frequency domain pulse signal in the step 3 is as follows:
when the number of pulses of the current frequency domain pulse signal is larger than that of the previous frequency domain pulse signal, the stepping motor controller controls the stepping motor to rotate forwards according to the change of the frequency domain pulse signal;
and when the number of pulses of the current frequency domain pulse signal is less than that of the pulses of the previous frequency domain pulse signal, the stepping motor controller controls the stepping motor to rotate reversely according to the change of the frequency domain pulse signal.
Further, the step motor controller in step 3 controls the step motor according to the frequency domain pulse signal according to the formula:
C＝0.25*(Bn-Bn-1)
wherein C is the variable aperture of the iris valve; b isnThe number of pulses of the current frequency domain pulse signal; b isn-1The number of pulses of the previous frequency domain pulse signal; 0.25 is the minimum variation aperture; when C is a negative number, the stepping motor controller controls the stepping motor to rotate reversely according to the change of the frequency domain pulse signal; and when the C is a positive number, the stepping motor controller controls the stepping motor to rotate forwards according to the change of the frequency domain pulse signal.
The invention has the beneficial effects that:
according to the invention, through the structure that the common aperture adjusting components of the two coupling resonant cavities are used for adjusting the aperture, the number of resonance peaks can be increased, and the noise elimination frequency band can be widened.
The invention collects and processes the pressure wave signal into a frequency domain pulse signal through the signal processor, and guides the frequency domain pulse signal into the stepping motor controller, the stepping motor controller obtains the rotation direction and the angle of the stepping motor required by the resonance frequency corresponding to the noise frequency according to a set formula, and finally adjusts the aperture size of the diaphragm valve in the aperture adjusting assembly through the power output end of the stepping motor, so that the resonance frequency can be adjusted in a certain range, and the noise elimination performance is improved.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial view of a seal mounting location for a pressure sensor;
FIG. 3 is a partial view of an iris valve mounting assembly;
FIG. 4 is a structural view of an iris valve;
FIG. 5 is a graph of the linear variation of each aperture and its corresponding resonant frequency in the absence of mean flow;
FIG. 6 is a graph of the transmission loss of four different flow velocities as a function of forcing frequency for an aperture of the iris valve of 1 cm;
FIG. 7 is a graph of the transmission loss of four different flow velocities as a function of forcing frequency for an aperture of 2 cm;
FIG. 8 is a graph showing the transmission loss of four different flow velocities according to the forcing frequency when the aperture of the iris valve is 3 cm.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, an embodiment of the present invention provides a helmholtz resonator including: the device comprises an air inlet pipeline 1, a main resonant cavity, a first neck short pipe 2, a second neck short pipe 3, a frequency modulation control module and an aperture adjusting assembly; the main resonant cavity comprises a first resonant cavity 4 with an opening at one end, a first flange 6, a second resonant cavity 5 with an opening at one end and a second flange 7; the aperture adjusting assembly comprises a flange assembly and an iris valve 10, the flange assembly comprises a third flange plate 8 and a fourth flange plate 9, and the iris valve 10 comprises a valve control gear 101, valve blades 102 and a valve body 103; the open end of the first resonant cavity 4 is hermetically connected with the first flange 6, two ends of the third flange 8 are respectively and coaxially and hermetically connected with one end of the first flange 6 and one end of the diaphragm valve 10, the other end of the diaphragm valve 10 is coaxially and hermetically connected with one end of the fourth flange 9, two ends of the second flange 7 are respectively and hermetically connected with the open ends of the fourth flange 9 and the second resonant cavity 5, and the first resonant cavity 4 and the second resonant cavity 5 are communicated through the diaphragm valve 10; one end of the first neck short pipe 2 is communicated with the air inlet pipeline 1, and the other end is communicated with the first resonant cavity 4; one end of the second neck short pipe 3 is communicated with the air inlet pipeline 1, and the other end is communicated with the second resonant cavity 5; after entering the air inlet pipeline 1, sound waves enter the first resonant cavity 4 through the first neck short pipe 2 for noise reduction, enter the second resonant cavity 5 through the second neck short pipe 3 for noise reduction, and can also be reduced between the first resonant cavity 4 and the second resonant cavity 5 through the diaphragm valve 10; the frequency modulation control module comprises a pressure sensor 11, a signal processor 12, a stepping motor controller 13 and a stepping motor 14 which are sequentially connected through signals; the pressure sensor 11 is sealed and arranged on the inner wall of the upstream of the air inlet pipeline 1 through two O-shaped sealing rings 111 and is used as the input end of the frequency modulation control module; an output gear of the stepping motor 14 is meshed with a valve control gear 101 of the iris valve 10, driven teeth are arranged on an outer ring of a valve blade 102, and the valve control gear 101 is meshed with the driven teeth to control the opening degree of the valve blade 102.
The working method of the Helmholtz resonator comprises the following specific steps:
step 1: when the noise airflow enters the air inlet pipeline 1, the pressure sensor 11 at the upstream of the air inlet pipeline 1 samples the pressure value of the noise airflow at a sampling frequency of 1024Hz to form a pressure wave signal, and the pressure wave signal is sent to the signal processor 12;
step 2: performing Fourier transform on the pressure wave signal acquired in the step 1 to form a frequency domain signal;
step 21: and (3) carrying out Fourier transform on the pressure wave signal obtained in the step (1) to form a frequency domain signal, and extracting main noise frequency from the frequency domain signal to form a frequency domain pulse signal. Sampling the pressure value of the noise airflow at a sampling frequency, wherein each sampling time is a group of frequency domain pulse signals, each group of frequency domain pulse signals consists of a plurality of pulses, and the number of the pulses corresponds to the noise frequency.
And step 3: the stepping motor controller 13 controls the stepping motor 14 to rotate forward and backward according to the frequency domain pulse signal, and can specifically control the rotation according to the following formula:
C＝0.25*(Bn-Bn-1)
where C is the variable aperture of the iris valve 10; b isnThe number of pulses of the current frequency domain pulse signal; b isn-1The number of pulses of the previous frequency domain pulse signal; 0.25 is the minimum variation aperture; when C is a negative number, that is, when the number of pulses of the current frequency domain pulse signal is less than the number of pulses of the previous frequency domain pulse signal, the stepping motor controller 13 controls the stepping motor 14 to rotate reversely according to the change of the frequency domain pulse signal; when C is a positive number, and when the number of pulses of the current frequency domain pulse signal is greater than the number of pulses of the previous frequency domain pulse signal, the stepping motor controller 13 controls the stepping motor 14 to rotate forward according to the change of the frequency domain pulse signal, and at this time, the aperture of the iris valve 10 is:
Cn＝Cn-1+0.25*(Bn-Bn-1)
wherein, CnIs the desired aperture of the iris valve 10; cn-1Is the aperture of the previous diaphragm valve 10; b isnThe number of pulses of the current frequency domain pulse signal; b isn-1The number of pulses of the previous frequency domain pulse signal; 0.25 is the minimum variation aperture. The number of pulses in the frequency domain pulse signal reflects the noise frequency, whether the noise frequency rises or falls is judged through the difference value of the number of pulses of the frequency domain pulse signal acquired twice, so that whether the aperture is increased or reduced on the basis of the original aperture is known, the difference value can also reflect the variation quantity required by the aperture of the diaphragm valve 10, and the required aperture of the diaphragm valve 10 is acquired through calculation.
Finally, the stepping motor 14 drives the aperture valve 10 to open and close to complete the adjustment of the silencing frequency band.
As shown in fig. 5-8, the inlet pipe 1 has a diameter of 12cm and a length of 118.5cm, the first neck pipe stub 2 and the second neck pipe stub 3 have the same size, a diameter of 5cm and a height of 8cm, the first resonant cavity 4 has a length of 31.8cm, the second resonant cavity 5 has a length of 51.4cm, and both resonant cavities have a diameter of 7.4 cm.
The range of the middle-low frequency band is 150Hz-500Hz, the sound attenuation effect is achieved in the frequency band, but the main frequency corresponding to noise has a certain range, when the aperture of the diaphragm valve 10 is 0cm, 1cm, 2cm and 3cm respectively and the hole is fully opened under 0Ma, the resonance frequency of the corresponding first resonance cavity 4 is 233Hz, 238Hz, 242Hz, 246Hz and 263Hz in sequence, the resonance frequency of the first resonance cavity 4 and the second resonance cavity 5 is in one-to-one correspondence according to the size of the aperture of the diaphragm valve 10, namely the noise frequency is 233Hz, when the noise frequency is 150Hz-233Hz, the aperture of the diaphragm valve 10 is in a fully closed state, the sound attenuation effect is the best state, and when the noise frequency is greater than 233Hz and less than 263Hz, the aperture of the diaphragm valve 10 and the noise frequency form a linear relationship of the following formula.
Fig. 6, 7 and 8 show graphs of transmission loss with the change of the forcing frequency at aperture diameters of the iris valve 10 of 1cm, 2cm and 3cm, and four mach numbers of 0, 0.03, 0.07 and 0.1, respectively. It can be seen from fig. 6, 7 and 8 that the two most dominant resonant frequencies do not change much as mach numbers increase, and in particular, the second resonant frequencies are 380Hz, 380Hz and 380Hz respectively at mach numbers 0, 0.03, 0.07 and 0.1 in fig. 7, so that the resonant frequencies do not change much under the influence of normal flow velocity changes. Referring to fig. 5, the aperture diameters are 0cm, 1cm, 2cm, 3cm and 7.4cm, the resonant frequencies are 233Hz, 238Hz, 242Hz, 246Hz and 263Hz, and it is also apparent from fig. 6 that three or more resonant peaks appear at 0.1Ma, and the number of resonant peaks is increased, so that after the aperture valve 10 is added to perform the piercing process, the resonant frequencies are sequentially increased and the sound-deadening band is widened as the aperture diameter is increased. Therefore, the main noise can be eliminated in a certain range according to the adjustment of the aperture size, so that the aim of optimal noise elimination effect is fulfilled, the noise elimination frequency band can be widened, and the resonance frequency can be adjusted in a certain range.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (9)
1. A Helmholtz resonator, comprising: the device comprises an air inlet pipeline, a main resonant cavity, a first neck short pipe, a second neck short pipe, a frequency modulation control module and an aperture adjusting assembly; the aperture adjusting component is arranged in the middle of the main resonant cavity and is coaxially connected with the main resonant cavity, and the main resonant cavity is divided into a first resonant cavity and a second resonant cavity; one end of the first neck short pipe is communicated with the air inlet pipeline, and the other end of the first neck short pipe is communicated with the first resonant cavity; one end of the second neck short pipe is communicated with the air inlet pipeline, and the other end of the second neck short pipe is communicated with the second resonant cavity; the input end of the frequency modulation control module is connected with the pipe wall of the air inlet pipeline and communicated with the inside of the air inlet pipeline, the output end of the frequency modulation control module is connected with the aperture adjusting assembly, and the frequency modulation control module is used for collecting the gas frequency in the air inlet pipeline and adjusting the aperture of the aperture adjusting assembly based on the collected gas frequency.
2. A helmholtz resonator according to claim 1, characterized in that the aperture adjusting assembly is an iris valve; the frequency modulation control module comprises a pressure sensor, a signal processor, a stepping motor controller and a stepping motor which are sequentially connected through signals; the pressure sensor is arranged on the inner wall of the air inlet pipeline and is used as an input end of the frequency modulation control module; and an output shaft of the stepping motor is connected with the diaphragm valve.
3. A helmholtz resonator according to claim 1 or 2, characterized in that the length of the first neck stub is equal to the length of the second neck stub.
4. A helmholtz resonator according to claim 1 or 2, characterized in that the tube inner diameter of the first neck stub is equal to the tube inner diameter of the second neck stub.
5. A method of operating a helmholtz resonator, comprising the steps of:
step 1: the pressure sensor collects the pressure value of noise airflow in the air inlet pipeline to form a pressure wave signal and sends the pressure wave signal to the signal processor;
step 2: the signal processor converts the pressure wave signal into a frequency domain pulse signal and sends the frequency domain pulse signal to the stepping motor controller;
and step 3: the stepping motor controller controls the stepping motor to rotate forward and backward according to the frequency domain pulse signal, and the stepping motor drives the aperture valve to open and close to complete the adjustment of the silencing frequency band.
6. A method for operating a Helmholtz resonator as claimed in claim 5, wherein in step 1 said pressure sensor generates a pressure wave signal at a sampling frequency of 1024Hz for the pressure value of the noise air flow in the inlet duct.
7. A method for operating a Helmholtz resonator as claimed in claim 6, wherein said step 2 of converting the pressure wave signal into a frequency domain pulse signal by the signal processor comprises the steps of:
step 21: performing Fourier transform on the pressure wave signal acquired in the step 1 to form a frequency domain signal;
step 22: and extracting main noise frequency from the frequency domain signal to form a frequency domain pulse signal.
8. The method of operating a Helmholtz resonator as claimed in claim 7, wherein said step 3 step comprises the specific method of the step motor controller controlling the forward and reverse rotation of the step motor according to the frequency domain pulse signal:
when the number of pulses of the current frequency domain pulse signal is larger than that of the previous frequency domain pulse signal, the stepping motor controller controls the stepping motor to rotate forwards according to the change of the frequency domain pulse signal;
and when the number of pulses of the current frequency domain pulse signal is less than that of the pulses of the previous frequency domain pulse signal, the stepping motor controller controls the stepping motor to rotate reversely according to the change of the frequency domain pulse signal.
9. A method of operating a helmholtz resonator as claimed in claim 7 or 8, wherein said step 3 step motor controller controls the stepping motor according to the frequency domain pulse signal by the following formula:
C＝0.25*(Bn-Bn-1)
wherein C is the variable aperture of the iris valve; bn is the pulse number of the current frequency domain pulse signal; bn-1 is the pulse number of the previous frequency domain pulse signal; 0.25 is the minimum variation aperture; when C is a negative number, the stepping motor controller controls the stepping motor to rotate reversely according to the change of the frequency domain pulse signal; and when the C is a positive number, the stepping motor controller controls the stepping motor to rotate forwards according to the change of the frequency domain pulse signal.
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| CN201910966633.0A CN110751938A (en) | 2019-10-12 | 2019-10-12 | Helmholtz resonator and working method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967708A (en) * | 2021-02-01 | 2021-06-15 | 江苏科技大学 | Cavity-movable Helmholtz resonator and control method thereof |
| CN113776724A (en) * | 2021-08-12 | 2021-12-10 | 中国船舶重工集团公司第七一九研究所 | Pressure measuring device |
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