CN216074826U - Broadband multi-band expressway phononic crystal sound barrier with information display function - Google Patents
Broadband multi-band expressway phononic crystal sound barrier with information display function Download PDFInfo
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Abstract
The utility model relates to a broadband multi-band highway phononic crystal sound barrier with information display, which comprises: the display panel comprises a fixed base, a display substrate assembly, a connecting tie beam, an hourglass-shaped scatterer and rock wool media; a clamping groove is arranged on the fixed base; the clamping groove is matched with the bottom of the hourglass-shaped scatterer; the hourglass-shaped scatterer can be clamped on the fixed base by means of the clamping groove and is fixed on the fixed base through screws; the connecting tie beam is fixedly arranged in the middle of the hourglass-shaped scatterer and used for fixing the hourglass-shaped scatterer; the display substrate assembly is fixedly arranged on the connecting tie beam; the display substrate assembly includes: the display device comprises a frame, a plurality of display modules and a power supply unit; the frame is fixedly arranged on the connecting tie beam; the display screen which can cover the frame is formed by splicing a plurality of display modules and is used for displaying traffic information or advertisement information. The sound barrier provided by the utility model can realize the control and information display of the noise in the noise frequency range of 160-2500Hz on the expressway to the maximum extent.
Description
Technical Field
The utility model belongs to the technical field of highway traffic noise control, and particularly relates to a broadband multi-band highway phononic crystal sound barrier with information display.
Background
The highway brings great convenience to people and brings serious noise pollution to residents along the highway, wherein about 80% of environmental noise on two sides of a traffic trunk line in China exceeds 70dB (A) in daytime and 55dB (A) at night. At present, the national traffic noise exceeding road sections reach more than 60 percent, and the area polluted by traffic noise exceeds 30 percent. The land price around the road in the area with the excessive noise is reduced, and the data show that the land price is reduced by 0.08-1.26% when the traffic noise is increased by 1 dB. The problem of road noise pollution which is becoming increasingly serious has become a considerable environmental problem in road construction.
The most direct and effective measure for controlling road traffic noise is to control the noise of the vehicle itself, but this is related to the development level of the automobile industry, and every 1dB reduction requires a huge investment and long-term research, so that it is difficult to reduce the noise from the sound source. At present, the control of noise propagation from the propagation path is the main means for reducing road noise, mainly including: building sound barriers and setting sound insulation windows, etc., wherein the most effective measure is to establish the sound barrier. A sound barrier is an acoustic barrier made of a solid material between a sound source and a receiving point. The effect of the method is to prevent direct sound from spreading, isolate transmitted sound, enable noise to have obvious additional attenuation in the spreading process, and generally reduce noise by 5-15 dB. The equivalent noise frequency of the current highway sound barrier design is 500Hz, but the noise sources of the highway can be mainly divided into two types: the noise generated by the operation of the automobile power system and the noise generated by the action of the automobile tire and the road surface are generated. The vehicle type, the vehicle speed and the road surface structure are three main factors influencing the noise magnitude and the frequency of the expressway. Previous studies have shown that the ratio of different vehicle types affects the proportion of noise of each frequency, the addition of small and medium vehicles increases the medium-high frequency component of the noise spectrum, and the addition of large vehicles increases the low frequency component. For the vehicle speed, when the vehicle speed is less than 50km/h, the noise of the vehicle power system is dominant, when the vehicle speed is more than 50km/h, the tire-road noise plays a dominant role, and when the vehicle speed increases, the proportion of the tire noise is gradually increased. Different road surface materials have great influence on the size and frequency of noise, in the aspect of tire-road surface noise, the average noise generated by a cement concrete road surface is 76-79dB, and the average noise of an asphalt road surface is 73-76dB, so that different types of road sections have different noise frequencies, which cannot be summarized, and the design standard of the conventional sound barrier is not fine enough.
The traditional sound barrier has various types, various metal plates, composite plates, gypsum plates, wood plates and the like are frequently adopted in engineering, the metal plates, the composite plates, the gypsum plates, the wood plates and the like belong to uniform medium structures, the sound insulation quantity of the material conforms to the mass density theorem, namely the sound insulation performance of the material is related to the surface density, and the sound insulation quantity can be increased by 6 decibels after the surface density is doubled. Therefore, to obtain a good sound insulation effect, the density of the sound insulation material must be increased. However, increasing the density of the sound insulation material increases the material cost and the construction difficulty, which limits the application range of the traditional sound insulation material.
In order to reduce noise more efficiently in a noise transmission way, a plurality of enterprises begin to develop new products by adopting new sound absorption materials and technologies, such as foamed aluminum, particle sound absorption materials and manufacturing technologies, at the enterprise level, and the new products are used as selling points to seize the market share of noise pollution control sound barriers. However, the new material has high cost and different difficulties in use, so the new material has not been widely used
However, in recent years, with the extensive use of traditional sound barriers, the problems of the traditional sound barriers are gradually highlighted. Firstly, the existing noise barrier lacks pertinence, and the main noise frequency bands are different due to different leading factors generated by different road noises, and the existing noise barrier does not perform targeted noise reduction setting on the main noise frequency bands. Secondly, the service life of the sound barrier is obviously reduced due to the pulsating wind pressure around the automobile body and the wind load action of natural environments on two sides of the road during the driving process of the automobile. Thirdly, the continuous high and big sound barrier of road both sides can cause the oppression to vehicle driver and passenger, influences light, is unfavorable for driving safety and comfortable by bus, from the aesthetic angle moreover, also is unfavorable for fusing mutually with the traffic view along the line.
A phononic crystal is a periodic composite structure characterized by an elastic band gap, and is essentially characterized by suppression of elastic waves in the band gap frequency range as they propagate in the phononic crystal. Therefore, phononic crystals are often used for noise reduction in a specific frequency range.
The photonic crystal sound barrier overcomes three defects of the traditional sound barrier, and can obtain a main traffic noise characteristic frequency spectrum according to the specific conditions of passing vehicles on the road, so that band gap design is carried out, and the noise reduction is more targeted; the scatterers of the phononic crystal sound barrier are not closely connected, the wind area can be reduced by the middle gap, the service life is prolonged, and the light transmission is beneficial to the vision of a driver and the riding experience of passengers; the phononic crystal sound barrier has flexible and changeable appearance design, higher artistic design potential and capability of being blended with traffic landscapes along the line. Meanwhile, compared with the existing sound barrier, the phononic crystal sound barrier has a certain noise reduction effect in a low-frequency noise frequency band.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the existing technical problems, the utility model provides the broadband multi-band highway photonic crystal sound barrier with the information display function, which can control the noise of a highway noise frequency band of 160-1250 Hz to the maximum extent, particularly obviously reduce the traffic noise of a main noise frequency band of 800-1250Hz, reduce the sound pressure level at a sound receiving point, ensure that the noise reduction effect of the sound barrier is more effective and more targeted, realize the information display, improve the attractiveness of two sides of a highway and increase the economic benefit.
(II) technical scheme
In order to achieve the purpose, the utility model adopts the main technical scheme that:
a broadband multi-band highway phononic crystal sound barrier with information display comprises: the display panel comprises a fixed base, a display substrate assembly, a connecting tie beam, an hourglass-shaped scatterer and rock wool media;
a clamping groove is formed in the fixed base;
the clamping groove is matched with the bottom of the hourglass-shaped scatterer;
the hourglass-shaped scatterer can be clamped on the fixing base by means of the clamping groove and is fixed on the fixing base through screws;
the connecting tie beam is fixedly arranged in the middle of the hourglass-shaped scatterer and used for fixing the hourglass-shaped scatterer;
the display substrate assembly is fixedly arranged on the connecting tie beam;
wherein the display substrate assembly comprises: the display device comprises a frame, a plurality of display modules and a power supply unit;
the frame is fixedly arranged on the connecting tie beam;
the display modules are spliced to form a display screen capable of covering the frame, and are fixedly arranged on the frame to display traffic information or advertisement information;
the power supply unit is arranged on the frame and is in power supply connection with the display screen;
the rock wool medium is filled in the hourglass-shaped scatterer, so that the noise reduction effect of the sound barrier is enhanced.
Preferably, the display substrate assembly further comprises a control unit;
the control unit is respectively connected with the display screen and the power supply unit;
the control unit is also connected with a remote information display server.
Preferably, the control unit includes: the device comprises a memory, a control chip and a wireless data transceiver;
the control chip is respectively connected with the memory and the wireless data transceiver;
the control chip is also respectively connected with the display screen and the power supply unit;
the control chip can be connected with a remote information display server by means of the wireless data transceiver.
Preferably, the power supply unit includes: the storage battery, the power control chip and the external power line are connected with the power supply control chip;
the power supply control chip is respectively connected with the storage battery and the external power supply line;
the power supply control chip is also respectively connected with the display screen and the control chip.
Preferably, the frame is made of acrylic;
the fixed base and the connecting tie beam are made of metal;
the hourglass-shaped scatterers are made of glass fiber reinforced plastic upright columns with the same height and are arranged in a square lattice mode.
Preferably, the cross-section of the hourglass-shaped diffuser is rectangular;
the resonance sound absorption cavity of the hourglass-shaped scatterer is hourglass-shaped;
the interior of the hourglass-shaped scatterer is of a hollow structure.
Preferably, the openings of the resonant sound absorption cavities of the hourglass-shaped diffuser are arranged perpendicular to the direction of the road.
Preferably, the plurality of hourglass shaped diffusers of the hourglass shaped diffusers are each arranged in a square lattice;
the wall thickness of the hourglass-shaped scatterer is 2-3.2 mm;
wherein, the lattice constant is a, that is, the horizontal and vertical center-to-center distances of the hourglass scatterers adjacent to each other are 0.17 m.
Preferably, the plurality of hourglass diffusers of the hourglass diffuser is arranged in 3 rows;
the rock wool medium has the volume weight of 32kg/m3The flow resistivity is 23000 Pa.s/m2A thermosetting resin is used as the binder.
Preferably, the length of the hourglass-shaped diffuser is one quarter of the length of the road noise wavelength.
(III) advantageous effects
The utility model has the beneficial effects that: the utility model provides a broadband multi-band highway phononic crystal sound barrier with information display, which has the following beneficial effects:
(1) the sound barrier provided by the application can realize information display, improves the attractiveness of both sides of a road, and increases economic benefits.
(2) The phononic crystal sound barrier is a discontinuous closed sound barrier, and the influence of pulsating wind pressure generated by a running vehicle is effectively weakened by gaps among scattering bodies, so that the service life of the sound barrier is prolonged; the light transmission is beneficial to the vision of a driver during driving, and the oppressive feeling of the conventional high and large closed sound barrier to the driver is avoided; because the 1/4 wavelength tube is adopted for noise reduction, the hourglass-shaped phononic crystal sound barrier has a more obvious noise reduction effect on noise in a specific frequency band; each scatterer of the hourglass-shaped phononic crystal sound barrier is provided with two resonant cavities, so that the noise absorption effect is more obvious; rock wool media are filled in the hourglass-shaped phononic crystal sound barrier, so that low-frequency traffic noise is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the main principle of noise reduction of the sound barrier according to the present invention;
FIG. 2 is a schematic diagram of a lattice unit cell of a phononic crystal sound barrier in accordance with a preferred embodiment of the phononic crystal sound barrier of the present invention;
FIG. 3 is a schematic diagram of the phononic crystal unit cell band structure of a preferred embodiment of the phononic crystal sound barrier of the present invention;
FIG. 4 is a top view of a preferred embodiment of the phononic crystal sound barrier of the present invention;
FIG. 5 is a front view of a photonic crystal sound barrier in accordance with a preferred embodiment of the photonic crystal sound barrier of the present invention;
FIG. 6 is a side view of a phononic crystal sound barrier of a preferred embodiment of the phononic crystal sound barrier of the present invention;
FIG. 7 is a schematic illustration of the insertion loss of the phononic crystal sound barrier of the present invention;
FIG. 8 is a schematic view of the structure of the frame of the present invention;
FIG. 9 is a system diagram illustrating a substrate assembly according to the present invention.
[ description of reference ]
1: a fixed base; 2: connecting the tie beam; 3: an hourglass-shaped diffuser; 4: rock wool medium.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 2-9: the embodiment discloses a broadband multi-band highway phononic crystal sound barrier with information display, which comprises: the device comprises a fixed base 1, a display substrate assembly, a connecting tie beam 2, an hourglass-shaped scatterer 3 and a rock wool medium 4; a clamping groove is formed in the fixed base 1; the clamping groove is matched with the bottom of the hourglass-shaped scatterer 3; the hourglass-shaped scatterer 3 can be clamped on the fixing base 1 by means of the clamping groove and is fixed on the fixing base 1 through screws; the connecting tie beam 2 is fixedly arranged in the middle of the hourglass-shaped scatterer 3 and used for fixing the hourglass-shaped scatterer 3; the display substrate assembly is fixedly arranged on the connecting tie beam 2; wherein the display substrate assembly comprises: the display device comprises a frame, a plurality of display modules and a power supply unit; the frame is fixedly arranged on the connecting tie beam 2; the display modules are spliced to form a display screen capable of covering the frame, and are fixedly arranged on the frame to display traffic information or advertisement information; the power supply unit is arranged on the frame and is in power supply connection with the display screen; the rock wool medium is filled in the hourglass-shaped scatterer, so that the noise reduction effect of the sound barrier is enhanced.
The display substrate assembly described in this embodiment further includes a control unit; the control unit is respectively connected with the display screen and the power supply unit; the control unit is also connected with a remote information display server.
It should be noted that: the telematics server here is capable of providing the control unit with the played-back film source data at irregular intervals, where the film source data at least comprises: traffic safety information and announcement information.
The control unit described in this embodiment includes: the device comprises a memory, a control chip and a wireless data transceiver; the control chip is respectively connected with the memory and the wireless data transceiver; the control chip is also respectively connected with the display screen and the power supply unit; the control chip can be connected with a remote information display server by means of the wireless data transceiver. The memory here is capable of storing a local playback source of certain data.
The power supply unit described in this embodiment includes: the storage battery, the power control chip and the external power line are connected with the power supply control chip; the power supply control chip is respectively connected with the storage battery and the external power supply line; the power supply control chip is also respectively connected with the display screen and the control chip. The external power line can be connected with commercial power or solar power and the like.
In the embodiment, the frame is made of acrylic; the fixed base 1 and the connecting tie beam 2 are made of metal; the hourglass-shaped scatterers 3 are made of glass fiber reinforced plastic columns with the same height and are arranged in a square lattice mode.
The cross-section of the hourglass-shaped diffuser 3 in this embodiment is rectangular; the resonance sound absorption cavity of the hourglass-shaped scatterer is hourglass-shaped; the hourglass-shaped scatterer 3 is internally of a hollow structure.
The openings of the resonant sound-absorbing cavities of the hourglass-shaped diffuser 3 described in this embodiment are arranged perpendicular to the direction of the road.
The plurality of hourglass-shaped scatterers of the hourglass-shaped scatterer 3 described in this embodiment are all arranged in a square lattice; the wall thickness of the hourglass-shaped scatterer 3 is 2-3.2 mm; here, the lattice constant is a, that is, the horizontal and vertical center-to-center distances of the hourglass scatterers 3 adjacent to each other are 0.17 m.
The plurality of hourglass-shaped diffusers of the hourglass-shaped diffuser 3 described in this embodiment are arranged in 3 rows; the rock wool medium 4 has a volume weight of 32kg/m3 and a flow resistivity of 23000Pa · s/m2, and uses a thermosetting resin as a binder.
The length of the hourglass-shaped diffuser 3 in this embodiment is one quarter of the wavelength of the road noise.
Fig. 1 shows a schematic diagram of the main principle of noise reduction of a sound barrier. The sound barrier is the most widely used in the traffic field as a noise reduction form for controlling the propagation of noise, and is recognized as the most effective measure, and the barrier is inserted between a sound source and a sound receiving point to prevent the noise from directly transmitting to the sound receiving point. Most of the noise will be detoured to the sound receiving point through the top of the sound barrier, except that a small portion of the noise will reach the sound receiving point by transmission and multiple reflections. The inserted sound barrier changes the propagation path of sound waves, indirectly increases the attenuation propagation distance and plays a role in reducing sound pressure of sound receiving points.
On the basis of the prior art, the embodiment provides a broadband multi-band highway phononic crystal sound barrier to realize effective attenuation of traffic noise at a main noise frequency band of 800-.
The phononic crystal sound barrier of the embodiment comprises a fixed base 1, a connecting tie beam 2, an hourglass-shaped scatterer 3 and a rock wool medium 4; inserting the hourglass-shaped scatterer 3 into a clamping groove in the fixing base 1, clamping and fixing by using screws, and fixing the connecting tie beam 2 and the hourglass-shaped scatterer 3 in the middle part to enhance the overall stability; rock wool medium 4 is filled in the hourglass-shaped scatterer 3 to enhance the noise reduction effect of the sound barrier. The hourglass-shaped scatterers are designed by adopting glass fiber reinforced plastic upright columns with the same height and are arranged in a square lattice manner. Under the combined action of the Bragg interference noise elimination mechanism and the cavity resonance sound absorption mechanism, the sound barrier structure of the phononic crystal can effectively attenuate traffic noise of 800-.
The broadband multi-band highway photonic crystal sound barrier with information display in the middle of the embodiment can fully play the advantage of improving the road traffic environment landscape function of the photonic crystal sound barrier while ensuring the noise reduction effect, fully optimize and improve the road traffic environment landscape quality and the visual environment quality of the highway, effectively reduce the load of wind load and prolong the service life of the sound barrier.
As shown in fig. 2, the hourglass-shaped scatterer is made of glass fiber reinforced plastic pipe, the length b of the scatterer is 0.13m, the width h of the scatterer is 0.1m, and the depth L1 of the hourglass-shaped resonant cavity is 0.06m, wherein the depth L11 of the small resonant cavity is 0.02m, the depth L22 of the large resonant cavity is 0.04m, the width L2 of the bottom is 0.05m, the radius R of the small corner is 0.01m, and the radius R of the circular wall of the small resonant cavity is 0.03 m. The sound wave enters the resonant cavity through the opening, and is violently rubbed with air in the cavity to consume sound energy, so that the noise reduction effect is achieved.
Meanwhile, attention needs to be paid to installation of the hourglass-shaped scatterer 3, and the opening of the hourglass-shaped scatterer is arranged perpendicular to the road direction.
The hourglass-shaped scatterers 3 are arranged in a square lattice with a lattice constant a, i.e. the distance between the horizontal and vertical centres of adjacent scatterers is 0.17 m.
The technical solution specifically adopted in the present embodiment, the characteristics thereof, the implementation manner and the test effect are described in detail below with reference to fig. 2 to 7.
Fig. 2 is a schematic diagram of a unit cell structure of an open type sound-absorbing scatterer. As shown in fig. 2, in this embodiment, a Bragg scattering mechanism is combined with a cavity resonance mechanism, the hourglass-shaped scatterer 3 is made of a glass fiber reinforced plastic scatterer wall, and since acoustic impedance of the glass fiber reinforced plastic is far greater than that of air, when sound waves are transmitted from an air matrix to the glass fiber reinforced plastic scatterer wall, total reflection occurs on an interface, and destructive interference occurs between adjacent phononic crystals, so that a part of sound waves with specific frequency cannot be transmitted, and a noise reduction effect with specific frequency is achieved; meanwhile, the hourglass-shaped scatterer 3 is provided with two resonant cavities, so that the resonant frequency range can be effectively expanded, when sound waves enter the resonant cavities through the openings, the sound waves and air in the cavities are rubbed, sound energy is converted into heat energy, and meanwhile, the sound waves are locally resonated in the cavities to play a role in noise reduction.
FIG. 3 is a schematic diagram of the energy band structure of the hourglass-shaped phononic crystal unit cell. As can be seen from the figure, in the main noise frequency band of 800-1250Hz on the expressway, the phononic crystal sound barrier can generate corresponding complete forbidden bands, and in the complete forbidden bands, sound waves cannot be continuously transmitted, so that the noise reduction function of specific frequency is realized, and the pertinence is realized.
Fig. 4 is a top view of the structure of the phononic crystal sound barrier. As can be seen from the figure, the scatterers 3 are sequentially inserted into the slots of the fixing base 1 in rows, then screws are driven into the joints of the back parts of the scatterers and the slots for fixing, finally the connecting tie beams 2 are installed, and screws are driven into the joints of the back parts of the scatterers and the connecting tie beams for fixing.
Fig. 5 is a front view of a phononic crystal sound barrier. As can be seen from the figure, the height of the phononic crystal sound barrier hourglass-shaped scatterers is the same and is 3 m.
Fig. 6 is a side view of a phononic crystal sound barrier. As can be seen, the hourglass-shaped diffusers are arranged in 3 rows.
Fig. 7 is a schematic illustration of insertion loss. As can be seen from the figure, the hourglass-shaped phononic crystal sound barrier has a certain control effect on traffic noise in all frequency ranges of 160-.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (10)
1. A broadband multi-band highway phononic crystal sound barrier with information display is characterized by comprising: the display panel comprises a fixed base, a display substrate assembly, a connecting tie beam, an hourglass-shaped scatterer and rock wool media;
a clamping groove is formed in the fixed base;
the clamping groove is matched with the bottom of the hourglass-shaped scatterer;
the hourglass-shaped scatterer can be clamped on the fixing base by means of the clamping groove and is fixed on the fixing base through screws;
the connecting tie beam is fixedly arranged in the middle of the hourglass-shaped scatterer and used for fixing the hourglass-shaped scatterer;
the display substrate assembly is fixedly arranged on the connecting tie beam;
wherein the display substrate assembly comprises: the display device comprises a frame, a plurality of display modules and a power supply unit;
the frame is fixedly arranged on the connecting tie beam;
the display modules are spliced to form a display screen capable of covering the frame, and are fixedly arranged on the frame to display traffic information or advertisement information;
the power supply unit is arranged on the frame and is in power supply connection with the display screen;
the rock wool medium is filled in the hourglass-shaped scatterer, so that the noise reduction effect of the sound barrier is enhanced.
2. The sound barrier of claim 1,
the display substrate assembly further comprises a control unit;
the control unit is respectively connected with the display screen and the power supply unit;
the control unit is also connected with a remote information display server.
3. The sound barrier of claim 2,
the control unit includes: the device comprises a memory, a control chip and a wireless data transceiver;
the control chip is respectively connected with the memory and the wireless data transceiver;
the control chip is also respectively connected with the display screen and the power supply unit;
the control chip can be connected with a remote information display server by means of the wireless data transceiver.
4. The sound barrier of claim 2,
the power supply unit includes: the storage battery, the power control chip and the external power line are connected with the power supply control chip;
the power supply control chip is respectively connected with the storage battery and the external power supply line;
the power supply control chip is also respectively connected with the display screen and the control chip.
5. The sound barrier of claim 4,
the frame is made of acrylic;
the fixed base and the connecting tie beam are made of metal;
the hourglass-shaped scatterers are made of glass fiber reinforced plastic upright columns with the same height and are arranged in a square lattice mode.
6. The sound barrier of claim 5,
the cross section of the hourglass-shaped scatterer is rectangular;
the resonance sound absorption cavity of the hourglass-shaped scatterer is hourglass-shaped;
the interior of the hourglass-shaped scatterer is of a hollow structure.
7. The sound barrier of claim 5,
the openings of the resonant sound absorption cavities of the hourglass-shaped scatterers are arranged perpendicular to the direction of the road.
8. The sound barrier of claim 7,
a plurality of hourglass-shaped scatterers of the hourglass-shaped scatterers are arranged according to square lattices;
the wall thickness of the hourglass-shaped scatterer is 2-3.2 mm;
wherein, the lattice constant is a, that is, the horizontal and vertical center-to-center distances of the hourglass scatterers adjacent to each other are 0.17 m.
9. The sound barrier of claim 1,
a plurality of hourglass-shaped scatterers of the hourglass-shaped scatterers are arranged in 3 rows;
the rock wool medium has the volume weight of 32kg/m3The flow resistivity is 23000 Pa.s/m2Use ofThermosetting resins act as binders.
10. The sound barrier of claim 7, wherein said hourglass shaped diffuser has a length that is one quarter of a wavelength of road noise.
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