CN109131854A - Low noise unmanned plane and its method for noise reduction control - Google Patents
Low noise unmanned plane and its method for noise reduction control Download PDFInfo
- Publication number
- CN109131854A CN109131854A CN201710505811.0A CN201710505811A CN109131854A CN 109131854 A CN109131854 A CN 109131854A CN 201710505811 A CN201710505811 A CN 201710505811A CN 109131854 A CN109131854 A CN 109131854A
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- vibration
- generating device
- unmanned plane
- motor
- vibration acquisition
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims description 31
- 238000001228 spectrum Methods 0.000 claims description 26
- 239000002033 PVDF binder Substances 0.000 claims description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/08—Helicopters with two or more rotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/02—Aircraft characterised by the type or position of power plants
- B64D27/24—Aircraft characterised by the type or position of power plants using steam or spring force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/40—Arrangements for mounting power plants in aircraft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U10/00—Type of UAV
- B64U10/10—Rotorcrafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U30/00—Means for producing lift; Empennages; Arrangements thereof
- B64U30/20—Rotors; Rotor supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U50/00—Propulsion; Power supply
- B64U50/10—Propulsion
- B64U50/19—Propulsion using electrically powered motors
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Remote Sensing (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The present invention discloses a kind of low noise unmanned plane and its method for noise reduction control, organic frame and horn are set, its key is: motor installation cabin is provided on horn, motor installs the motor driven propeller rotation in cabin, the inner wall in motor installation cabin and bottom are equipped with vibration acquisition generating device, the vibration acquisition generating device is connect by transmission line with controller, which drives the vibration acquisition generating device self-vibration, offsets the vibration that motor generates.Vibration frequency is simultaneously sent to the controller being arranged on the rack by the vibration frequency of vibration acquisition generating device acquisition motor generation, which generates the vibration of the frequency opposite with the vibration frequency according to vibration acquisition generating device described in vibration frequency control to offset the vibration of motor generation.Using low noise unmanned plane of the invention, the noise of unmanned plane motor generation can be reduced, and the weight of unmanned plane is not influenced.
Description
Technical field
The present invention relates to unmanned plane fields, more particularly to a kind of low noise unmanned plane and its method for noise reduction control.
Background technique
The reason of existing unmanned plane is because of structure and material, the noise that unmanned plane is generated in flight is larger, and existing
Generation unmanned plane application in, there are certain applications to have strict demand to the noise of unmanned plane, for example, need under low noise environment into
Row Image Acquisition, if unmanned plane fly height, Image Acquisition may be unclear, and if fly it is low, unmanned plane generate make an uproar
Sound will increase noise.
The main component that unmanned plane generates noise is motor, and the high speed rotation of motor installs motor in motor
It is vibrated in cabin, to produce biggish noise.Generally use in the prior art change motor installation cabin material and
The mode for generating the opposite canceling sound noise of frequency carries out noise reduction.Material for changing unmanned plane carries out the mode of noise reduction,
Because material requested is mostly nano material, price is higher, increases the cost of unmanned plane.
And it is adopted using the sound for generating reverse-frequency to offset to need by the way of noise to install installation sound at cabin in motor
Acquisition means and sound generating apparatus.The two devices not only increase the weight of entire unmanned plane, and to guarantee in motor
Installation installs the two devices in cabin, it is necessary to increase motor installation cabin, increase unmanned plane weight.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of low noise unmanned plane and its method for noise reduction control, because of sound
Sound is generated by vibration, so acquiring the vibration frequency of motor by vibration acquisition generating device, passes through inverse piezoelectric effect, control
Device processed generates the vibration generated with vibration frequency opposite oscillation, counteracting motor according to vibration frequency control vibration acquisition generating device
It is dynamic, to reduce noise.
Technical solution is as follows:
A kind of low noise unmanned plane is arranged organic frame and horn, key is: motor installation cabin is provided on horn,
Motor installs the motor driven propeller rotation in cabin, and the inner wall in motor installation cabin and bottom are equipped with vibration acquisition and fill
It sets, which is connect by transmission line with controller, which drives the vibration acquisition generating device
The vibration that motor generates is offset in self-vibration.
Using the above structure, vibration acquisition generating device incudes according to piezoelectric effect is converted into electricity for the mechanical oscillation of motor
Signal is pressed, not will receive the interference of other noises (such as ambient noise).Controller carries out spectrum analysis to voltage signal and obtains electricity
The vibration frequency of machine, and the reverse frequency opposite with the vibration frequency is generated according to vibration frequency.
Controller generates reverse voltage signal according to reverse frequency, and vibration acquisition generating device is generated according to inverse piezoelectric effect
Motor oscillating is offset in the vibration opposite with motor oscillating, reduces noise.Wherein, controller show that vibration frequency is the prior art,
Driving collection generating device to generate vibration by voltage signal is equally the prior art.
Further, the vibration acquisition generating device includes the first vibration acquisition generating device and the second vibration acquisition
Generating device, the first vibration acquisition generating device setting is between the motor and motor installation bilge portion, and described second
Vibration acquisition generating device setting the motor and motor installation cabin side wall between, the first vibration acquisition generating device and
The output end of second vibration acquisition generating device is connect with the controller respectively.
Using the above structure, the first vibration acquisition generating device can offset motor up-down vibration, and the second vibration acquisition occurs
Device can offset motor side-to-side vibrations, and the acquisition of vibration frequency and the generation of reverse-frequency are carried out convenient for controller, enhances noise reduction
Effect.
Further, input of the signal output end of the vibration acquisition generating device through signal amplifier and controller
End connection, the output end of the controller are connect through power amplifier with the signal output end of vibration acquisition generating device.
Using the above structure, signal amplifier can amplify the vibration signal of acquisition, it is ensured that the standard of the signal of acquisition
True property, the control signal that power amplifier can export controller amplify, and generate convenient for driving vibration acquisition generating device
Self-vibration.
Further, the vibration acquisition generating device is made of N block piezoelectric membrane, is adopted between N block piezoelectric membrane
It is connected with mode in parallel, the signal amplifier is charge amplifier, and N block piezoelectric membrane connects through charge amplifier and controller
It connects, the piezoelectric membrane is made through the piezoelectric membrane of PVDF (Kynoar).N is positive integer.
Using the above structure, because voltage signal or charge signal that monolithic piezoelectric membrane generates are all too small, and muti-piece pressure
Conductive film parallel connection can obtain bigger charge signal, and the weaker charge signal that charge amplifier can generate piezoelectric membrane
It amplifies.So muti-piece piezoelectric membrane is arranged in parallel the letter that can amplify the acquisition of vibration acquisition generating device with charge amplifier
Number, noise reduction control is carried out convenient for controller.
Further, the vibration acquisition generating device is made of N block piezoelectric membrane, is adopted between N block piezoelectric membrane
It is connected with concatenated mode, the signal amplifier is voltage amplifier, and N block piezoelectric membrane connects through voltage amplifier and controller
It connects, the piezoelectric membrane is made through the piezoelectric membrane of PVDF (Kynoar).
Using the above structure, because voltage signal or charge signal that monolithic piezoelectric membrane generates are all too small, and muti-piece pressure
Conductive film tandem energy obtains bigger voltage signal, and the relatively weak charge signal that piezoelectric membrane can be generated of voltage amplifier into
Row is further amplified.So being arranged in series for muti-piece piezoelectric membrane can amplify the acquisition of vibration acquisition generating device with voltage amplifier
Signal, convenient for controller carry out noise reduction control.
Piezoelectric membrane made of PVDF is high to the stability of temperature, so influence of the high temperature of motor generation to piezoelectric membrane
It is small, and piezoelectric membrane high mechanical strength made of PVDF, it is hardly damaged, and light-weight, does not almost have to the weight of unmanned plane
Have an impact.
Further, the bulkhead in motor installation cabin is provided with cable-through hole, the transmission of the vibration acquisition generating device
Line is connect by the cable-through hole with controller.
Using the above structure, convenient for the wiring of motor and vibration acquisition generating device in motor installation cabin.
Further, the motor installation cabin bottom and side wall has the first cable-through hole and the second cable-through hole, institute
The transmission line for stating the first vibration acquisition generating device and the second vibration acquisition generating device passes through the first cable-through hole and second respectively
Cable-through hole is connect with controller.
Further, M heat release hole is provided at the top of motor installation cabin.M is positive integer.
Using the above structure, the heat discharge motor that heat release hole can generate motor installs cabin, reduces motor installation cabin
Temperature.
Further, it is provided with bearing at the top of motor installation cabin, the transmission shaft passes through the bearing and propeller
Connection.
Using the above structure, the friction that can reduce transmission shaft and motor installation cabin, reduces noise.
A kind of method for noise reduction control of low noise unmanned plane, key be the following steps are included:
Step 1 obtains the collected vibration signal of vibration acquisition generating device；
Step 2 is AD converted collected vibration signal, obtains the digital signal of vibration signal；
Step 3 carries out Fast Fourier Transform (FFT), the rumble spectrum vibrated and vibration phase spectrum to digital signal；
Step 4, determined in conjunction with rumble spectrum and rumble spectrum the inverse frequency spectrum opposite with rumble spectrum and rumble spectrum and
Reverse phase spectrum；
Step 5 determines control signal according to inverse frequency spectrum and reverse phase spectrum；
Step 6 carries out DA conversion to control signal, and driving vibration acquisition generating device generates self-vibration.
Using the above method, control signal can be obtained by the analysis to vibration frequency, vibration can be driven according to control signal
Dynamic generating device generates self-vibration, offsets the vibration that motor generates.
The utility model has the advantages that using low noise unmanned plane of the invention the noise of unmanned plane motor generation can be reduced, and to nothing
Man-machine weight does not influence.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is that the motor of embodiment one installs the structural schematic diagram in cabin；
Fig. 3 is system structure diagram of the invention；
Fig. 4 is method for noise reduction control flow chart of the invention；
Fig. 5 is that the motor of embodiment two installs the structural schematic diagram in cabin.
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described.
Embodiment one, as shown in Figs 1-4, a kind of low noise unmanned plane, including 2,4 horns 2 of rack 1 and 4 piece horn are right
Claim to be arranged in rack 1, one end of horn 2 and rack 1 are fixed, and the other end and motor installation cabin 3 are fixed.Motor is installed in cabin 3
The transmission shaft 5 of motor 4 be pierced by and be located at the bearing 9 at motor installation cabin 3 top and connect with propeller 6.Motor is installed at the top of cabin 3 also
It is provided with a heat release hole 8 for heat dissipation of 4 (M=4).
Vibration acquisition generating device 7 is provided in motor installation cabin 3, vibration acquisition generating device 7 includes that the first vibration is adopted
Collect generating device 7a and the second vibration acquisition generating device 7b, the first vibration acquisition generating device 7a setting is in the motor
Between 4 and motor installation 3 bottom of cabin, the second vibration acquisition generating device 7b setting installs cabin 3 with motor in the motor 4
Between side wall.First vibration acquisition generating device 7a and the second vibration acquisition generating device 7b are by muti-piece PVDF Kynoar
Manufactured piezoelectric membrane composes in parallel.
The motor installation 3 bottom of cabin is provided with cable-through hole 10, the first vibration acquisition generating device 7a and the second vibration acquisition
The transmission line 13 of generating device 7b is connect by the cable-through hole 10 with controller.
First vibration acquisition generating device 7a and the second vibration acquisition generating device 7b acquires the upper and lower of the generation of motor 4 respectively
Vibration frequency and side-to-side vibrations frequency, and these vibration frequencies are sent to the controller being arranged in rack 1, the controller root
The first vibration acquisition generating device 7a and the second vibration acquisition generating device 7b is controlled respectively according to vibration frequency to generate and vibration up and down
The vibration that motor 4 generates is offset in dynamic frequency and the opposite vibration of side-to-side vibrations frequency.
The signal output end of first vibration acquisition generating device 7a and the second vibration acquisition generating device 7b are respectively through signal
The connection of the input terminal of amplifier and controller, signal amplifier use charge amplifier, two output ends point of the controller
It is not connect through power amplifier with the input terminal of the first vibration acquisition generating device 7a and the second vibration acquisition generating device 7b.
Controller carries out noise reduction control using following methods:
Step 1 obtains the collected vibration signal of vibration acquisition generating device 7；
Step 2 is AD converted collected vibration signal, obtains the digital signal of vibration signal；
Step 3 carries out Fast Fourier Transform (FFT), the rumble spectrum vibrated and vibration phase spectrum to digital signal；
Step 4 determines inverse frequency spectrum and reverse phase spectrum in conjunction with rumble spectrum and rumble spectrum；
Step 5 determines control signal according to inverse frequency spectrum and reverse phase spectrum；
Step 6 carries out DA conversion to control signal, and driving vibration acquisition generating device 7 generates self-vibration.
Embodiment two, as shown in figure 5, embodiment two is basically the same as the first embodiment, difference is: first vibration
Acquisition generating device 7a and the second vibration acquisition generating device 7b is composed in series by muti-piece piezoelectric membrane, first vibration acquisition
The output end of generating device 7a and the second vibration acquisition generating device 7b connect through the signal input part of voltage amplifier and controller
It connects.
Motor installation 3 bottom and side wall of cabin has the first cable-through hole 11 and the second cable-through hole 12.Described first
The transmission line 13 of vibration acquisition generating device 7a and the second vibration acquisition generating device 7b pass through the first cable-through hole 11 and the respectively
Two cable-through holes 12 are connect with controller.
Finally, it should be noted that foregoing description is only the preferred embodiment of the present invention, the ordinary skill people of this field
Member under the inspiration of the present invention, without prejudice to the purpose of the present invention and the claims, can make multiple similar tables
Show, such transformation is fallen within the scope of protection of the present invention.
Claims (10)
1. organic frame (1) and horn (2) is arranged, it is characterised in that: horn is provided with motor on (2) in a kind of low noise unmanned plane
Install cabin (3), motor installs motor (4) driving propeller (6) rotation in cabin (3), the inner wall of motor installation cabin (3) and
Bottom is equipped with vibration acquisition generating device (7), which is connect by transmission line (12) with controller,
The controller drives vibration acquisition generating device (7) self-vibration, offsets the vibration that motor (4) generate.
2. low noise unmanned plane according to claim 1, it is characterised in that: the vibration acquisition generating device (7) includes the
One vibration acquisition generating device (7a) and the second vibration acquisition generating device (7b), the first vibration acquisition generating device (7a) and
Two vibration acquisition generating devices (7b) are separately positioned on the bottom and side wall of motor installation cabin (3), and first vibration is adopted
Collection generating device (7a) and the second vibration acquisition generating device (7b) are connect with the controller respectively.
3. low noise unmanned plane according to claim 1, it is characterised in that: the signal of the vibration acquisition generating device (7)
Output end is connected through the input terminal of signal amplifier and controller, and the output end of the controller is adopted through power amplifier and vibration
Collect the signal output end connection of generating device (7).
4. low noise unmanned plane according to claim 3, it is characterised in that: the vibration acquisition generating device (7) is by N block
Piezoelectric membrane forms, and is connected by the way of in parallel between N block piezoelectric membrane, and the signal amplifier is charge amplifier, N block
Piezoelectric membrane is connect through charge amplifier with controller, and the piezoelectric membrane is through the piezoelectric membrane by PVDF (Kynoar)
It is made.
5. low noise unmanned plane according to claim 3, it is characterised in that: the vibration acquisition generating device (7) is by N block
Piezoelectric membrane forms, and is connected between N block piezoelectric membrane using concatenated mode, and the signal amplifier is voltage amplifier, N block
Piezoelectric membrane is connect through voltage amplifier with controller, and the piezoelectric membrane is through the piezoelectric membrane by PVDF (Kynoar)
It is made.
6. -5 any low noise unmanned plane according to claim 1, it is characterised in that: described motor installation cabin (3) bulkhead is opened
Have cable-through hole (10), the transmission line (13) of the vibration acquisition generating device (7) is connect by the cable-through hole (10) with controller.
7. low noise unmanned plane according to claim 2, it is characterised in that: motor installation cabin (3) bottom and side wall point
It is not provided with the first cable-through hole (11) and the second cable-through hole (12), the first vibration acquisition generating device (7a) and the second vibration are adopted
The transmission line (13) for collecting generating device (7b) is connect by the first cable-through hole (11) and the second cable-through hole (12) with controller respectively.
8. -5 any low noise unmanned plane according to claim 1, it is characterised in that: opened at the top of motor installation cabin (3)
There are M heat release hole (8).
9. -5 any low noise unmanned plane according to claim 1, it is characterised in that: set at the top of motor installation cabin (3)
It is equipped with bearing (9), the transmission shaft (5) passes through the bearing (9) and connect with propeller (6).
10. a kind of method for noise reduction control of low noise unmanned plane, it is characterised in that the following steps are included:
Step 1 obtains vibration acquisition generating device (7) collected vibration signal；
Step 2 is AD converted collected vibration signal, obtains the digital signal of vibration signal；
Step 3 carries out Fast Fourier Transform (FFT), the rumble spectrum vibrated and vibration phase spectrum to digital signal；
Step 4 determines inverse frequency spectrum and reverse phase spectrum in conjunction with rumble spectrum and rumble spectrum；
Step 5 determines control signal according to inverse frequency spectrum and reverse phase spectrum；
Step 6 carries out DA conversion to control signal, and driving vibration acquisition generating device (7) generates self-vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710505811.0A CN109131854A (en) | 2017-06-28 | 2017-06-28 | Low noise unmanned plane and its method for noise reduction control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710505811.0A CN109131854A (en) | 2017-06-28 | 2017-06-28 | Low noise unmanned plane and its method for noise reduction control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109131854A true CN109131854A (en) | 2019-01-04 |
Family
ID=64805432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710505811.0A Pending CN109131854A (en) | 2017-06-28 | 2017-06-28 | Low noise unmanned plane and its method for noise reduction control |
Country Status (1)
| Country | Link |
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| CN (1) | CN109131854A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113168842A (en) * | 2020-06-24 | 2021-07-23 | 深圳市大疆创新科技有限公司 | Sound processing method, sound processing device, unmanned aerial vehicle and computer-readable storage medium |
| CN115857052A (en) * | 2023-02-22 | 2023-03-28 | 中国民用航空飞行学院 | Navigation meteorological information receiving equipment with noise reduction function and broadcasting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113168842B (en) * | 2020-06-24 | 2023-02-17 | 深圳市大疆创新科技有限公司 | Sound processing method, sound processing device, unmanned aerial vehicle and computer-readable storage medium |
| CN115857052A (en) * | 2023-02-22 | 2023-03-28 | 中国民用航空飞行学院 | Navigation meteorological information receiving equipment with noise reduction function and broadcasting device |
| CN115857052B (en) * | 2023-02-22 | 2023-05-09 | 中国民用航空飞行学院 | Navigation weather information receiving equipment with noise reduction function and broadcasting device |
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