CN115250079B - Sound barrier device for capturing sound energy generated by travel of a roadside vehicle - Google Patents
Sound barrier device for capturing sound energy generated by travel of a roadside vehicle Download PDFInfo
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- CN115250079B CN115250079B CN202210888219.4A CN202210888219A CN115250079B CN 115250079 B CN115250079 B CN 115250079B CN 202210888219 A CN202210888219 A CN 202210888219A CN 115250079 B CN115250079 B CN 115250079B
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- 238000006243 chemical reaction Methods 0.000 claims description 30
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- 238000000034 method Methods 0.000 claims description 15
- 238000003306 harvesting Methods 0.000 claims description 4
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/11—Combinations of wind motors with apparatus storing energy storing electrical energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/30—Wind motors specially adapted for installation in particular locations
- F03D9/34—Wind motors specially adapted for installation in particular locations on stationary objects or on stationary man-made structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
Abstract
The present invention provides a sound barrier device for capturing sound energy generated by the travel of a roadside vehicle, comprising: the energy collecting and converting device comprises a sound barrier screen body, wherein a plurality of energy collecting modules are distributed on the side face of one side of the sound barrier screen body, which faces to a highway, an acoustic energy collecting and converting device and a wind energy collecting and converting device are arranged in each energy collecting module, the acoustic energy collecting and converting device comprises an acoustic cavity resonator and a PVDF film acoustic-electric converting device, and the wind energy collecting and converting device adopts a wind motor; the power storage device is connected with the acoustic energy collecting and converting device and the wind energy collecting and converting device; and the active noise reduction device is connected with the power storage device. The sound barrier device can efficiently collect and convert sound energy and wind energy, and the noise reduction effect of the sound barrier can be improved by converting the energy into electric energy for supplying power to the active noise reduction device; meanwhile, clean energy can be provided for monitoring, early warning, illumination and the like of the road side.
Description
Technical Field
The invention belongs to the technical field of sound barrier design and application, and particularly relates to a sound barrier device for capturing sound energy generated by running of a road side vehicle.
Background
When the vehicle runs at a high speed on a road, larger traffic noise can be generated, and the physical and mental health of residents along the road is plagued. In order to reduce the influence of noise, a sound barrier is generally arranged along the road of the sensitive area, and the sound barrier realizes the attenuation of sound waves by reflecting and/or absorbing the noise sound waves.
The traditional sound barrier can effectively relieve traffic noise, but the sound wave energy of the traffic noise cannot be utilized. With increasing importance on energy conservation and emission reduction, a sound barrier device capable of realizing acoustic energy-electric energy conversion appears in the prior art, for example, chinese patent document CN113699907a discloses a two-dimensional phonon crystal sound barrier with energy supply, which includes a continuous physical matrix phase, a dispersed phase and a defect state filling phase, which are separately arranged, wherein the dispersed phase and the defect state filling phase are both fixed on the physical matrix phase, the dispersed phase is distributed in a two-dimensional periodic array, defect state channels are arranged in the two-dimensional periodic array, the defect state filling phase is located in the defect state channels, the physical matrix phase is a light material, the dispersed phase is a heavy material, the defect state filling phase is an acoustic energy conversion collecting device, and the acoustic energy conversion collecting device is a vibration sensor based on piezoelectric material.
The sound barrier of the prior art described above is capable of collecting sound energy, converting it into electrical energy, and powering the road side infrastructure. But the acoustic energy conversion and collection device on the sound barrier is used for collecting and converting highway noise, so that the conversion efficiency is low, and long-term operation of road side facilities is often difficult to maintain. Therefore, how to explore a novel sound barrier structure, so that the novel sound barrier structure can efficiently collect and convert the road side sound energy is a technical problem which needs to be solved in the prior art.
Disclosure of Invention
The invention solves the technical problem that the sound barrier in the prior art cannot collect and convert road side sound energy and wind energy at the same time, and further provides the sound barrier device which has high-efficiency conversion rate and good noise reduction function and is used for capturing sound energy generated by running of a road side vehicle.
The technical scheme adopted for solving the technical problems is as follows:
a sound barrier device for capturing sound energy generated by travel of a roadside vehicle, comprising: the sound barrier comprises a sound barrier screen body, wherein a plurality of energy collecting modules are distributed on the side face of one side of the sound barrier screen body, which faces to a highway, and each energy collecting module comprises a cavity and an energy collector positioned on one side of the cavity; the energy collector comprises a conical shell with gradually contracted diameter and an annular outer edge arranged around an opening of an expansion end of the conical shell, the opening of the contraction end of the conical shell is communicated with the cavity, and a PVDF film acoustic-electric conversion device is arranged in each energy collection module; fan blades are arranged in the annular outer edge; and the power storage device is connected with the acoustic energy collecting and converting device.
The cavity is square in cross section, and the shrinkage end opening is communicated with one side face of the cavity, which is square.
The ratio of the total area of the fan blades to the area of the opening of the expansion end is less than 1/3, and the number of the fan blades is calculated by firstly calculating the approximate value n of the blades according to the following formula:
wherein v is the average speed of the road vehicle, in m/s; a is the optimal tip speed ratio of the fan, and the value is 6; l is the length of the cavity in the axial direction along the conical shell, and the unit is m; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken;
if the calculated approximate value n is an integer, taking the value n as the slice value p of the blade; if the approximation n is not an integer, the nearest integer value larger than the value of n is taken as the slice value p of the blade.
The measured value a of the tip speed ratio of the fan blade under the condition that the road vehicle maintains the average speed v to run 0 Is in the range of 6-8, and satisfies the following conditions:
wherein v is the average speed of the road vehicle, in m/s; a, a 0 An actual value for the fan tip speed ratio; l is the length of the cavity in the axial direction along the conical shell, and the unit is m; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken; p is the number of blades of the fan.
The ratio of the length of the cavity and the energy collector in the axial direction of the conical shell is 1:1, and the ratio of the volume of the energy collector to the volume of the cavity is 1/4-1/3.
The ratio of the annular outer edge to the length of the conical shell in the axial direction is 1:4.
The thickness of the blades of the fan is less than or equal to 1cm.
The wind power generation device is characterized by further comprising a wind motor, wherein the wind motor is installed in the cavity, the fan blades are connected with the wind motor, and the wind motor is connected with the power storage device at the same time.
The power storage device is connected with the active noise reduction device and supplies power to the active noise reduction device.
The energy collection modules are arranged on the sound barrier screen body in sequence along the transverse direction and the vertical direction.
The sound barrier device for capturing the sound energy generated by the running of the road side vehicle comprises a cavity and an energy collector positioned at one side of the cavity, wherein the energy collector comprises a conical shell and an annular outer edge arranged around an opening of an expansion end of the conical shell, and the resonator formed by the structure can obviously promote the sound energy in the cavity so as to promote the converted electric energy; the gradually contracted conical shell is convenient for sound wave transmission into the cavity, meanwhile, between the vehicle and the sound barrier, disturbance to air flow is generated due to running of the vehicle, meanwhile, negative pressure disturbance is formed between the vehicle and the barrier, so that the fan blades positioned in the annular outer edge rotate. Meanwhile, as the vehicle runs and leaves, positive and negative pressure disturbance generated by air flow extrusion between the screen body and the vehicle further acts on PVDF, so that the acoustic energy density is improved. When the sound barrier device is designed, only the average speed of vehicles in lanes closest to the sound barrier is considered, the vehicles run in the device and play a dominant role in the conversion amount of sound energy and wind energy, and other lanes have smaller influence on the conversion amount of sound energy and wind energy due to longer distance.
According to the sound barrier device for capturing the sound energy generated by the running of the road side vehicle, the total area of the fan blades is preferably less than 1/3 of the opening area of the collecting device, the value range of the tip speed ratio of the wind wheel is 6.0-8.0, and the number of the fan blades is calculated by using the model, so that the frequency of sound generated by the fan is the same as the resonance frequency of the resonant cavity, and the electric energy generated by the sound energy can be increased by about 65% compared with that before the fan is installed.
The sound barrier device for capturing the sound energy generated by the running of the road-side vehicle can synchronously utilize the sound energy and the wind energy generated by the running of the vehicle on the road at high speed, and the average effective sound energy and the wind energy conversion density of the sound barrier can be not lower than 200W/m through the optimal design 2 Far greater than the energy density that can be produced when the acoustic and wind energy devices are independently arranged. The invention can improve the noise reduction effect of the sound barrier by converting sound energy and wind energy into electric energy and supplying power to the active noise reduction device. Meanwhile, the converted electric energy is utilized, clean energy can be provided for monitoring, early warning, illumination and the like of the road side, and therefore the aims of saving energy and reducing carbon emission are achieved.
In order to make the technical solution of the sound barrier device for capturing sound energy generated by driving a vehicle on a road side more clear, the present invention will be further described in detail with reference to the specific drawings and the specific embodiments.
Drawings
FIG. 1 is a schematic view of a sound barrier device according to the present invention;
FIG. 2 is a schematic view of the structure of the housing of the energy harvesting module of the sound barrier apparatus according to the present invention;
fig. 3 is a cross-sectional view of an energy harvesting module of a sound barrier device according to the present invention.
Wherein, the reference numerals are as follows:
1-an energy harvesting module; 11-a cavity; 12-an annular outer rim; 2-fan blades; 14-PVDF film; 15-a wind motor; 16-conical shell.
Detailed Description
Example 1
The present embodiment provides a sound barrier device for capturing sound energy generated by driving a vehicle on a road side, as shown in fig. 1, the sound barrier device includes a sound barrier screen body, a plurality of energy collecting modules 1 are distributed on a side surface of the sound barrier screen body facing the road, and the energy collecting modules 1 include a cavity 11 and an energy collector located on one side of the cavity 11; the energy collector comprises a conical shell 16 with gradually shrinking diameter and an annular outer edge 12 arranged around the opening of the expansion end of the conical shell 16, and the opening of the contraction end of the conical shell 16 is communicated with the cavity 11. In this embodiment, the cross section of the cavity 11 perpendicular to the axial direction of the conical housing 16 is square, as shown in fig. 2, the side length of the square is 10cm, the extension length of the cavity 11 along the axial direction is 5cm, and the whole cavity 11 is a rectangular cavity with the length of 10cm×10cm×5cm. The extension of the conical housing 16 in the axial direction of the conical housing 16 is 4cm, and the extension of the annular outer rim 12 in the axial direction is 1cm. The opening of the expansion end of the conical shell 16 is in a circular shape with the diameter of 10cm, the opening of the contraction end of the conical shell 16 is arranged on one side surface of the cavity 11, and the opening of the contraction end of the conical shell 16 is in a circular shape with the diameter of 2 cm.
In each energy collecting module 1, a PVDF film sonoelectric conversion device is provided, and the PVDF film 14 of the PVDF film sonoelectric conversion device is a square film with a side length of 6cm, and as a preferred embodiment, the ratio of the side length of the PVDF film 14 to the side length of the square cavity cross section is in the range of 0.4-0.6. The vertical distance between the PVDF film 14 and the converging end opening of the cone housing 16 is 4cm.
Inside the annular outer rim 12, fan blades 2 are mounted, the central axis of the fan blades 2 being arranged coaxially with the annular outer rim 12. The radial length of the fan blade 2 is 4.5cm; in this embodiment, the average speed of the vehicle running on the road lane closest to the sound barrier is 81km, and the tip speed ratio range of the fan blade 2 is 6.2 under the condition of corresponding average speed running, so that the vibration frequency of the energy collecting module 1 can be matched by controlling the rotation speed of the blade, so as to promote the absorption of the sound energy. The fan blade 2 in the present application is a luffing type fan blade used in fans of the prior art, said fan blade having a thickness of 0.4-0.5cm. The design of the fan blade meets the design standard in national standard GB/T13981-2009 general requirement for the design of small wind turbines. In this embodiment, the ratio of the total area of the fan blades 2 to the area of the opening of the expansion end is 1/4, and the total number of the blades is 4.
The sound barrier device is further provided with an electric storage device, the electric storage device is connected with the acoustic energy collecting and converting device, in this embodiment, the electric storage device is connected with the acoustic energy collecting and converting device through a rectifying device, and the rectifying device comprises a rectifying controller and a capacitor which are sequentially connected in series.
Example 2
The present embodiment provides a sound barrier device for capturing sound energy generated by driving a vehicle on a road side, as shown in fig. 1, the sound barrier device includes a sound barrier screen body, a plurality of energy collecting modules 1 are distributed on a side surface of the sound barrier screen body facing the road, and the energy collecting modules 1 include a cavity 11 and an energy collector located on one side of the cavity 11; the energy collector comprises a conical shell 16 with gradually shrinking diameter and an annular outer edge 12 arranged around the opening of the expansion end of the conical shell 16, and the opening of the contraction end of the conical shell 16 is communicated with the cavity 11. In this embodiment, the cross section of the cavity 11 perpendicular to the axial direction of the conical housing 16 is square, the side length of the square is 10cm, the extending length of the cavity 11 along the axial direction is 5cm, and the whole cavity 11 is a rectangular cavity with the length of 10cm×10cm×5cm. The extension of the conical housing 16 in the axial direction of the conical housing 16 is 4cm, and the extension of the annular outer rim 12 in the axial direction is 1cm. The opening of the expansion end of the conical shell 16 is in a circular shape with the diameter of 10cm, the opening of the contraction end of the conical shell 16 is arranged on one side surface of the cavity 11, and the opening of the contraction end of the conical shell 16 is in a circular shape with the diameter of 2 cm.
In each energy collecting module 1, a PVDF film acousto-electric conversion device and a wind energy collecting conversion device are arranged, as shown in fig. 2 and 3, a PVDF film 14 of the PVDF film acousto-electric conversion device is a square film with a side length of 6cm, and a vertical distance between the PVDF film 14 and the opening of the contraction end of the cone-shaped casing 16 is 4cm. The wind energy collecting and converting device comprises a fan blade 2 arranged in the annular outer edge 12 and a wind motor 15 arranged in the cavity 11, wherein the wind motor 15 is arranged at the side part of the PVDF film 14.
The radial length of the fan blade 2 in this embodiment is 4.5cm, and the central axis of the fan blade 2 is arranged coaxially with the annular outer edge 12. The blade shape and the installation position are the same as those of the embodiment 1, in this embodiment, the average running speed of the vehicle on the road lane closest to the sound barrier is 80km, and the tip speed ratio range of the fan blade 2 under the corresponding average running speed condition is 6.2. In this embodiment, the ratio of the total area of the fan blades 2 to the area of the opening of the expansion end is 1/4, and the total number of the blades is 4.
The sound barrier device is further provided with an electric storage device, the electric storage device is connected with the acoustic energy collecting and converting device, in this embodiment, the electric storage device is connected with the acoustic energy collecting and converting device through a rectifying device, and the rectifying device comprises a rectifying controller and a capacitor which are sequentially connected in series.
Example 3
The present embodiment provides a sound barrier device for capturing sound energy generated by driving a vehicle on a road side, as shown in fig. 1, the sound barrier device includes a sound barrier screen body, a plurality of energy collecting modules 1 are distributed on a side surface of the sound barrier screen body facing the road, and the energy collecting modules 1 include a cavity 11 and an energy collector located on one side of the cavity 11; the energy collector comprises a conical shell 16 with gradually shrinking diameter and an annular outer edge 12 arranged around the opening of the expansion end of the conical shell 16, and the opening of the contraction end of the conical shell 16 is communicated with the cavity 11. In this embodiment, as shown in fig. 2, the cross section of the cavity 11 perpendicular to the axial direction of the conical shell 16 is square, the side length of the square is 10cm, the extension length of the cavity 11 along the axial direction is 5cm, and the whole cavity 11 is a rectangular cavity with the length of 10cm×10cm×5cm. The extension of the conical housing 16 in the axial direction of the conical housing 16 is 4cm, and the extension of the annular outer rim 12 in the axial direction is 1cm. The opening of the expansion end of the conical shell 16 is in a circular shape with the diameter of 10cm, the opening of the contraction end of the conical shell 16 is arranged on one side surface of the cavity 11, and the opening of the contraction end of the conical shell 16 is in a circular shape with the diameter of 2 cm.
A PVDF film sonoelectric conversion device is provided in each of the energy collecting modules 1, and the PVDF film 14 of the PVDF film sonoelectric conversion device is a square film with a side length of 6 cm. The fan blades 2 are installed in the annular outer edge 12, the radial length of each fan blade 2 is 4.5cm, and the shape and the installation position of each fan blade are the same as those of the embodiment 1. In this embodiment, the ratio of the total area of the fan blades 2 to the area of the opening of the expansion end is 1/4, and the number of blades is calculated according to the following method:
wherein v is the average speed of the road vehicle in m/s, and the average speed of the vehicle on the road lane closest to the sound barrier in the embodiment is 22.2m/s; a is the optimal tip speed ratio of the fan, and the value is 6; l is the length of the cavity 11 along the axial direction of the conical shell 16, and is in unit of m, and L is 0.05m in the embodiment; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken;
the calculated approximation n is 2.12, and the nearest integer value 3 greater than the value m is taken as the blade number of the blade, so in this embodiment, 3 blades of the fan are provided in total.
In this embodiment, the radial length of the fan blade 2 is 4.5cm, the blade shape is the same as that of embodiment 1, the average running speed of the vehicle on the road where the sound barrier is located is 80km, and the actual measured value of the tip speed ratio of the fan blade 2 under the corresponding average running speed condition is 6.2.
Verifying the actual tip speed ratio, and calculating the following formula:
wherein v is the average speed of the road vehicle and takes a value of 22.2m/s; a, a 0 An actual value of 6.2 for the fan tip speed ratio; l is the length of the cavity 11 in the axial direction along the conical shell 16, 0.05m; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is a unit time, taking 1s.
Calculating to obtain n 0 =2.19 < 3, and its actual tip speed ratio meets the requirements.
In this embodiment, the sound barrier device is further provided with an electrical storage device, and in this embodiment, the electrical storage device is connected with the PVDF film sonotrode through a rectifying device, where the rectifying device includes a rectifying controller and a capacitor that are sequentially connected in series.
Example 4
The present embodiment provides a sound barrier device for capturing wind energy and sound energy generated by driving a road-side vehicle, as shown in fig. 1, the sound barrier device includes a sound barrier screen body, a plurality of energy collecting modules 1 are distributed on a side surface of the sound barrier screen body facing a road, and the energy collecting modules 1 include a cavity 11 and an energy collector located at one side of the cavity 11; the energy collector comprises a conical shell 16 with gradually shrinking diameter and an annular outer edge 12 arranged around the opening of the expansion end of the conical shell 16, and the opening of the contraction end of the conical shell 16 is communicated with the cavity 11. In this embodiment, the cross section of the cavity 11 perpendicular to the axial direction of the conical housing 16 is square, the side length of the square is 10cm, the extending length of the cavity 11 along the axial direction is 5cm, and the whole cavity 11 is a rectangular cavity with the length of 10cm×10cm×5cm. The extension length of the conical shell along the axial direction of the conical shell is 4cm, and the extension length of the annular outer edge 12 along the axial direction is 1cm. The opening of the expansion end of the conical shell 16 is in a circular shape with the diameter of 10cm, the opening of the contraction end of the conical shell 16 is arranged on one side surface of the cavity 11, and the opening of the contraction end of the conical shell 16 is in a circular shape with the diameter of 2 cm.
A PVDF film acousto-electric conversion device and a wind energy collecting conversion device are arranged in each energy collecting module 1, and as shown in fig. 2 and 3, a PVDF film 14 of the PVDF film acousto-electric conversion device is a square film with a side length of 6 cm. The wind energy collecting and converting device comprises a fan blade 2 arranged in the annular outer edge 12 and a wind motor 15 arranged in the cavity 11, wherein the wind motor 15 is arranged at the side part of the PVDF film 14.
Inside the annular outer edge 12, fan blades 2 are mounted, the radial length of the fan blades 2 is 4.5cm, and the shape of the blades is the same as that of the embodiment 1. In this embodiment, the ratio of the total area of the fan blades 2 to the area of the opening of the expansion end is 1/4, and the number of blades is calculated according to the following method:
wherein v is the average speed of the road vehicle in m/s, and the average speed of the vehicle on the road lane closest to the sound barrier in the embodiment is 22.4m/s; a is the optimal tip speed ratio of the fan, and the value is 6; l is the length of the cavity 11 along the axial direction of the conical shell 16, and is in unit of m, and L is 0.05m in the embodiment; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken;
the calculated approximation n is 2.14, and the nearest integer value 3 greater than the value m is taken as the blade number of the blade, so in this embodiment, 3 blades of the fan are provided in total.
In this embodiment, the radial length of the fan blade 2 is 4.5cm, the blade shape is the same as that of embodiment 1, the average running speed of the vehicle on the road where the sound barrier is located is 81km, and the actual measured value of the tip speed ratio of the fan blade 2 under the corresponding average running speed condition is 6.2.
The following formula is calculated:
wherein v is the average speed of the road vehicle and has a value of 22.4m/s; a, a 0 An actual value of 6.2 for the fan tip speed ratio; l is the length of the cavity 11 in the axial direction along the conical shell 16, 0.05m; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is a unit time, taking 1s.
Calculating to obtain n 0 =2.19 < 3, and its actual tip speed ratio meets the requirements.
In this embodiment, the sound barrier device is further provided with an electrical storage device, and in this embodiment, the electrical storage device is connected with the PVDF film acoustic electric conversion device and the wind turbine 15 through a rectifying device, where the rectifying device includes a rectifying controller and a capacitor that are sequentially connected in series.
Example 5
The present embodiment provides a sound barrier device for capturing sound energy generated by driving a vehicle on a road side, as shown in fig. 1, the sound barrier device includes a sound barrier screen body, a plurality of energy collecting modules 1 are distributed on a side surface of the sound barrier screen body facing the road, and the energy collecting modules 1 include a cavity 11 and an energy collector located on one side of the cavity 11; the energy collector comprises a conical shell 16 with gradually shrinking diameter and an annular outer edge 12 arranged around the opening of the expansion end of the conical shell 16, and the opening of the contraction end of the conical shell 16 is communicated with the cavity 11. In this embodiment, as shown in fig. 2, the cross section of the cavity 11 perpendicular to the axial direction of the conical shell 16 is square, the side length of the square is 10cm, the extension length of the cavity 11 along the axial direction is 5cm, and the whole cavity 11 is a rectangular cavity with the length of 10cm×10cm×5cm. The extension of the conical housing 16 in the axial direction of the conical housing is 4cm and the extension of the annular outer rim 12 in the axial direction is 1cm. The opening of the expansion end of the conical shell 16 is in a circular shape with the diameter of 10cm, the opening of the contraction end of the conical shell 16 is arranged on one side surface of the cavity 11, and the opening of the contraction end of the conical shell 16 is in a circular shape with the diameter of 2 cm.
A PVDF film sonoelectric conversion device is provided in each of the energy collecting modules 1, and the PVDF film 14 of the PVDF film sonoelectric conversion device is a square film with a side length of 6 cm. Inside the annular outer edge 12, fan blades 2 are mounted, the radial length of the fan blades 2 is 4.5cm, and the shape of the blades is the same as that of the embodiment 1. In this embodiment, the ratio of the total area of the fan blades 2 to the area of the opening of the expansion end is 1/4, and the number of blades is calculated according to the following method:
wherein v is the average speed of the road vehicle in m/s, and the average speed of the vehicle on the road lane closest to the sound barrier in the embodiment is 23.1m/s; a is the optimal tip speed ratio of the fan, and the value is 6; l is the length of the cavity 11 along the axial direction of the conical shell 16, and is in unit of m, and L is 0.05m in the embodiment; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken;
the calculated approximation n is 2.21, and the nearest integer value 3 greater than the value m is taken as the blade number of the blade, so in this embodiment, 3 blades of the fan are provided in total.
In this embodiment, the radial length of the fan blade 2 is 4.5cm, the blade shape is the same as that of embodiment 1, the average running speed of the vehicle on the road where the sound barrier is located is 83km, and the actual measured value of the tip speed ratio of the fan blade 2 under the corresponding average running speed condition is 8.4.
The following formula is calculated:
wherein v is the average speed of the road vehicle and takes a value of 23.1m/s; a, a 0 The actual value for the fan tip speed ratio is 8.4; l is the length of the cavity 11 in the axial direction along the conical shell 16, 0.05m; s is the unit area, 1m is taken 2 The method comprises the steps of carrying out a first treatment on the surface of the t is a unit time, taking 1s.
Calculating to obtain n 0 ＝3.1＞2.21。
In this embodiment, the sound barrier device is further provided with an electrical storage device, and in this embodiment, the electrical storage device is connected with the PVDF film sonotrode through a rectifying device, where the rectifying device includes a rectifying controller and a capacitor that are sequentially connected in series.
In the sound barrier device in the above embodiments 1 to 5, the energy collecting modules 1 are arranged on the sound barrier screen body in order along the transverse direction and the vertical direction, and the sound barrier screen body is an integral body formed by the energy collecting modules 1. The sound barrier screen body is arranged on the base body, the overall height of the sound barrier screen body is 3m, the ground clearance is 1m, the distance between the sound barrier screen body and the road side is 0.5m, and the road is the same bidirectional four-road.
The energy conversion of the sound barrier in examples 1 to 5 was measured, and the energy generated per unit area of the sound barrier was calculated as the energy density of the sound barrier, and the results showed that the energy density of the sound barrier for converting sound energy in examples 1, 3, and 5 was 121W/m 2 、143W/m 2 、108W/m 2 The sound barrier panels of examples 2 and 4, which convert sound energy and wind energy, have a capacity density of 201W/m 2 、225W/m 2 。
As a preferred embodiment, the active noise reduction device in the foregoing embodiments 1 to 5, where the power storage device may be connected to the active noise reduction device, for supplying power to the active noise reduction device, where the active noise reduction device includes a speaker, a microphone, and a host. The working frequency range of the microphone is required to be 20 Hz-20000 Hz. The host consists of a board card of ARM+DSP architecture, processes the acoustic signals acquired by the microphone, analyzes the distribution rule and propagation characteristics of the sound field, processes and calculates anti-noise, inputs the anti-noise signals to the loudspeaker, and outputs the anti-noise signals through the loudspeaker. As a further preferable embodiment, the power storage device can supply power to the lighting device, the monitoring device and the early warning device at the road side at the same time so as to realize energy conservation and emission reduction.
Comparative example
To further verify the effect of the sound barrier device of the present invention, the following comparative examples were set for comparative experiments.
Comparative example 1
The sound barrier device in this comparative example includes a sound barrier screen body on which a plurality of energy collecting modules are distributed on a side face of the sound barrier screen body facing a road, and the structures of the cavities of the energy collecting modules and the energy collectors are exactly the same as in example 1. The sound barrier device in this comparative example is different from that in example 1 in that the fan blades in the annular outer rim in example 1 are removed and not installed.
The overall structure of the sound barrier device in this comparative example is the same as that of example 1. The energy conversion amount of the sound barrier device in this comparative example was measured, and the energy generated per unit area of the sound barrier panel was calculated as the energy density of the sound barrier, and the energy density of the sound barrier panel in this comparative example was 51W/m 2 。
Comparative example 2
The sound barrier device in this comparative example includes a sound barrier screen body on which a plurality of energy collecting modules are distributed on a side face of the sound barrier screen body facing a road, and the structures of the cavities of the energy collecting modules and the energy collectors are exactly the same as in example 1. In this embodiment, the PVDF film acoustic-electric conversion device in each of the energy collecting modules in embodiment 1 is removed, and only the wind energy collecting-converting device is provided, that is, fan blades are installed in the annular outer edge, and a wind motor is installed in the cavity for collecting and converting wind energy.
The overall structure of the sound barrier device in this comparative example is the same as that of example 1. The electric energy conversion amount of the sound barrier device in this comparative example was examined, and the sound barrier panel in this comparative example had a capacity density of 93W/m 2 。
From the above results, the sum of the energy density values of the acoustic energy and the wind energy is far smaller than that of the embodiment, and the sound barrier screen body can effectively improve the collection and conversion rate of the acoustic energy.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the protection scope of the present invention is subject to the claims.
Claims (9)
1. A sound barrier device for capturing sound energy generated by travel of a roadside vehicle, comprising:
the sound barrier comprises a sound barrier screen body, wherein a plurality of energy collecting modules are distributed on the side face of one side of the sound barrier screen body, which faces to a highway, and each energy collecting module comprises a cavity and an energy collector positioned on one side of the cavity;
the energy collector comprises a conical shell with gradually contracted diameter and an annular outer edge arranged around an opening of an expansion end of the conical shell, the opening of the contraction end of the conical shell is communicated with the cavity, and a PVDF film acoustic-electric conversion device is arranged in each energy collection module;
fan blades are arranged in the annular outer edge;
the power storage device is connected with the PVDF film acousto-electric conversion device;
the ratio of the total area of the fan blades to the area of the opening of the expansion end is less than 1/3, and the number of the fan blades is calculated by firstly calculating the approximate value n of the blades according to the following formula:
n=；
wherein,the average speed of the road vehicle is in m/s; a is the optimal tip speed ratio of the fan, and the value is 6; />A unit m is the length of the cavity in the axial direction along the conical shell; />Is 1m in unit area 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken;
when the calculated approximate value n is an integer, taking the value n as a slice value p of the blade; when the approximation n is not an integer, the nearest integer value n larger than the value n is taken 1 As the blade number p of the blade.
2. The sound barrier device for capturing sound energy generated by travel of a roadside vehicle of claim 1, wherein the cavity is a square-sectioned cavity, the constricted end opening being in communication with a square-sectioned side face of the cavity.
3. The sound barrier device for capturing sound energy generated by a road-side vehicle traveling of claim 2, wherein said fan blade has an actual measured value a of a fan tip speed ratio under a condition that the road vehicle maintains an average vehicle speed traveling 0 Is in the range of 6-8, and satisfies the following conditions:
≤p
wherein,the average speed of the road vehicle is in m/s; a, a 0 The actual measurement value of the fan tip speed ratio; />A unit m is the length of the cavity in the axial direction along the conical shell; />Is 1m in unit area 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the unit time, 1s is taken; p is the number of blades of the fan.
4. A sound barrier device for capturing acoustic energy generated by road side vehicle travel as claimed in claim 3 wherein the ratio of the length of the cavity and the energy collector in the axial direction of the conical housing is 1:1 and the ratio of the volume of the energy collector to the volume of the cavity is 1/4-1/3.
5. The sound barrier device for capturing sound energy generated by travel of a roadside vehicle of claim 4, wherein a ratio of the annular outer rim to a length of the tapered housing in an axial direction is 1:4.
6. The sound barrier device for capturing sound energy generated by travel of a roadside vehicle of claim 5, wherein a blade thickness of the fan is less than or equal to 1cm.
7. The sound barrier device for capturing sound energy generated by travel of a roadside vehicle according to claim 6, wherein a wind motor is further provided, the wind motor being installed in the cavity, the fan blade being connected to the wind motor, the wind motor being simultaneously connected to the power storage device.
8. The sound barrier device for capturing sound energy generated by travel of a roadside vehicle according to claim 7, wherein an active noise reduction device is further provided, and the power storage device is connected to the active noise reduction device to supply power to the active noise reduction device.
9. The sound barrier apparatus for capturing sound energy generated by travel of a roadside vehicle of any one of claims 1-8, wherein the energy harvesting modules are arranged in a sequential order laterally and vertically on the sound barrier screen.
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