Sound barrier structure arranged back to noise source

Abstract

The utility model discloses a sound barrier structure arranged back to a noise source, which comprises a T-shaped device body, the top end of the device body is provided with a sound absorber structure, the sound absorber structure comprises a plurality of tip sound absorbers which are arranged in sequence, each tip sound absorber is of an isosceles right triangle structure, and the tip sound absorbers are arranged at the top end of the T-shaped device body. The first right-angle side of each tip sound absorber serves as the bottom of the tip sound absorber and is connected with the top end of the T-shaped device body, the first right-angle sides and the inclined sides are arranged in the mode that the first right-angle sides and the inclined sides do not face a noise source, namely the second right-angle sides are opposite to the noise source, and the second right-angle side of each tip sound absorber serves as the height of the tip sound absorber and is right opposite to the noise source in a vertical mode. Compared with the prior art, the sound barrier structure has the highest insertion loss value within the center frequency range of 500 Hz to 1600 Hz, so that the sound wave absorption rate is highest, and the noise reduction effect is best.

Description

Technical Field

[0001] The utility model belongs to the technical field of noise control, and in particular relates to a sound barrier structure arranged in a manner of facing away from a noise source. Background Art

[0002] At present, setting up sound barriers on both sides of the road for noise protection is a relatively effective way to block noise propagation, and it has been widely used in the prevention and control of road traffic noise pollution. Figure 1 As shown, there are three propagation paths for noise to reach the receiving point through the sound barrier: diffraction, transmission and reflection. Among them, diffraction is the most important path. Except for a small number of sound waves that reach the receiving point through transmission and multiple reflections, most sound waves are diffracted to the receiving point through the top of the sound barrier. The noise reduction effect of the upright sound barrier is closely related to its height. In order to improve the noise reduction effect, its height must be increased, and increasing the height of the sound barrier will have an impact on economy, safety and other aspects. In order to reduce the dependence on the height of the sound barrier, acoustic workers and technicians have developed a top noise reduction device. The top noise reduction device is placed on the top of the upright sound barrier, which can improve the noise reduction effect of the sound barrier without significantly increasing the height of the sound barrier. At present, the road sound barriers actually used are mainly "upright type", but the diffraction attenuation effect is obviously insufficient. As an improvement, a common method is to add a top structure on the basis of the "upright" sound barrier. As Figure 2 As shown, these top structures include the common "T-shaped," "inverted L-shaped," and "antler-shaped" shapes. By varying the angle and shape of the top of the sound barrier, the effective height of the barrier is increased. These top structures are currently the most commonly used sound barrier structures, but they suffer from disadvantages such as suboptimal additional noise reduction and limited noise reduction capabilities. Furthermore, the frequency characteristics of different noise environments can vary significantly, such as between urban main roads and urban light rail. However, traditional sound barriers are not designed to adapt to specific noise environments. Instead, the same barrier is used in all noise environments, resulting in significantly insufficient noise reduction performance in some environments. Furthermore, the increased structure of traditional sound barriers increases the overall height of the barrier, reducing its light transmittance. This affects visibility in natural light conditions and indirectly increases the risk of high-speed driving.

[0003] The existing sound barrier structure has the following specific problems:

[0004] 1. The attenuation of top diffraction sound is limited, the additional noise reduction effect is not ideal, and the overall noise reduction capability is insufficient;

[0005] 2. The noise reduction effect lacks specificity. Since the dominant factors of road noise are different, the main noise frequency bands are also different. At present, most areas in the country use the same type of vertical sound barriers, which results in a large waste of resources and unsatisfactory noise reduction effects.

[0006] 3. To achieve better noise reduction effects, if we continue to use upright sound barriers, we must increase the height of the sound barriers. Continuous high sound barriers on both sides of the road will cause a sense of oppression to vehicle drivers and passengers, affect light, and are not conducive to driving safety and riding comfort. From an aesthetic point of view, it is also not conducive to integration with the traffic landscape along the road. Utility Model Content

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a new sound barrier structure arranged in a manner facing away from the noise source, which can absorb noise in the highway noise frequency band of 315-1600Hz to the greatest extent.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A sound barrier structure arranged in a manner facing away from the noise source, comprising:

[0010] T-type device body,

[0011] The top of the T-shaped device body is provided with a sound absorbing structure, and the sound absorbing structure comprises a plurality of sequentially arranged tip sound absorbing bodies.

[0012] Each tip sound absorber is an isosceles right triangle structure.

[0013] The first right-angled side of each tip sound absorber serves as the bottom of each tip sound absorber and is connected to the top of the T-shaped device body. The first right-angled side and the oblique side are arranged in a manner that they do not face the noise source, that is, they face away from the noise source.

[0014] The second right-angled side of each tip sound absorber serves as the height of each tip sound absorber and faces the noise source in a vertical manner.

[0015] Preferably, the sound absorber structure includes a first tip sound absorber.

[0016] Preferably, the sound absorber structure includes a second tip sound absorber.

[0017] Preferably, the sound absorber structure includes a third tip sound absorber.

[0018] Preferably, a first wedge-shaped groove is formed between the first tip sound absorber and the second tip sound absorber.

[0019] Preferably, a second wedge-shaped groove is formed between the second tip sound absorber and the third tip sound absorber.

[0020] Preferably, the bottom and height of the first tip sound absorber, the second tip sound absorber and the third tip sound absorber are all 1 / 3 m.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The utility model optimizes the top structure of the existing sound barrier device and arranges it to face away from the noise source, thereby achieving maximum control of noise in the highway noise frequency band of 315-1600Hz. Installing sound barriers in the corresponding sections can make the noise reduction effect more effective and targeted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the propagation path of noise through the sound barrier to the receiving point;

[0024] Figure 2 It is a structural diagram of the existing sound barrier structure;

[0025] Figure 3 This is a schematic diagram of a three-dimensional structure of a sound barrier structure provided by one embodiment of the present invention, which is arranged in a manner of facing away from the noise source;

[0026] Figure 4 This is a schematic diagram of a planar structure of a sound barrier structure provided by another embodiment of the present invention, which is arranged in a manner of facing away from the noise source;

[0027] Figure 5 This is a schematic diagram of the actual installation of a sound barrier structure provided by another embodiment of the present invention, which is arranged in a manner of facing away from the noise source;

[0028] Figure 6 This is a schematic diagram comparing insertion loss values ​​of sound barriers with different numbers of tip sound absorbers at a center frequency of 500 Hz, provided by another embodiment of the present invention;

[0029] Figure 7 A one-third octave band insertion loss curve of a sound barrier structure arranged in a manner facing away from a noise source, provided by another embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram comparing insertion loss values ​​of a sound barrier structure arranged in a manner facing away from the noise source and other types of sound barrier structures provided by another embodiment of the present invention at a center frequency of 500 Hz;

[0031] Figure 9 This is a schematic diagram comparing insertion loss values ​​of a sound barrier structure arranged in a manner facing away from the noise source and other types of sound barrier structures provided by another embodiment of the present invention at a center frequency of 1000 Hz;

[0032] Figure 10This is a schematic diagram comparing insertion loss values ​​of a sound barrier structure arranged in a manner facing away from the noise source and other types of sound barrier structures provided by another embodiment of the present invention at a center frequency of 1600 Hz;

[0033] Figure 11 This is a cloud diagram of the noise reduction effect of a sound barrier structure arranged in a manner facing away from the noise source at a center frequency of 1000 Hz, provided by another embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram comparing the insertion loss values ​​of a sound barrier structure arranged in a manner facing away from the noise source provided by another embodiment of the present invention and other sound barrier structures in the prior art at a center frequency of 1600 Hz;

[0035] Figure 13 It is a schematic diagram of comparative analysis of insertion loss values ​​in various frequency bands of a sound barrier structure arranged in a manner facing away from the noise source provided by another embodiment of the present invention and other sound barrier structures in the prior art.

[0036] The following are the descriptions of the reference numerals:

[0037] 1. T-shaped device body; 2. First tip sound absorber; 3. Second tip sound absorber; 4. Third tip sound absorber. DETAILED DESCRIPTION

[0038] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although the accompanying drawings illustrate specific embodiments of the present invention, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. For example, "including" or "comprising" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the definition of the attached claims.

[0040] To facilitate understanding of the embodiments of the present invention, further explanation will be given below using specific embodiments as examples in conjunction with the accompanying drawings, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0041] In one embodiment, Figure 3 and Figure 4 as well as Figure 5 As shown, the utility model provides a sound barrier structure arranged in a manner of facing away from the noise source, comprising:

[0042] T-type device body 1,

[0043] A sound absorbing structure is provided at the top of the T-shaped device body 1, and the sound absorbing structure includes a plurality of sequentially arranged tip sound absorbing bodies, and the first right angle side and the oblique side of each tip sound absorbing body are arranged in a manner not facing the noise source, that is, facing away from the noise source.

[0044] In another embodiment, the plurality of sequentially arranged sound absorbers include at least a first tip sound absorber 2 and a second tip sound absorber 3. Furthermore, a third tip sound absorber 4 may also be included.

[0045] See also Figure 6 , Figure 6 The figure is a comparison diagram of the case where the number of top wedges (i.e. the number of tip sound absorbers) is set to 2, 3 and 4 respectively, with the center frequency being 500Hz. Figure 6 It can be seen that as the number of tip absorbers increases, the insertion loss value also increases accordingly. When the number of absorbers is 3, the insertion loss value is 10% higher than the insertion loss value when the number of absorbers is 2, while the insertion loss value when the number of absorbers is 4 is only 3% higher than the insertion loss value when the number of absorbers is 3. As the number of absorbers increases, the required manufacturing materials will also increase. Therefore, after comprehensive comparison, setting the number of absorbers to 3 is the optimal option.

[0046] In another embodiment, the first tip sound absorber, the second tip sound absorber and the third tip sound absorber are all isosceles right triangle structures.

[0047] In this embodiment, the first, second, and third tip sound absorbers, each designed as an isosceles right triangle structure, are connected to the T-shaped device body in the same manner. The first right-angled side of each tip sound absorber is connected to the top of the T-shaped device body, while the second right-angled side serves as the height. The angles between the first and second right-angled sides and the hypotenuse are both 45°.

[0048] It should be noted that the reason why the tip sound absorber is designed as an isosceles right triangle is that:

[0049] 1. Compared with other geometric shapes, the isosceles right triangle has higher flexibility in spatial arrangement, which helps to improve the space utilization at the top of the T-shaped device body.

[0050] 2. Due to its asymmetry in the vertical direction, the isosceles right triangle can disperse reflected sound waves, which helps to provide a more balanced sound absorption effect in a wider frequency range, especially for eliminating standing waves and reducing reverberation time.

[0051] 3. The right-angled edges of the isosceles right triangle can increase the scattering of sound waves, reduce the continuous reflection of sound waves, and thus improve the sound absorption efficiency.

[0052] 4. Isosceles right triangles can be easily combined with other polygons to form effective sound diffusers, which help to evenly distribute noise throughout the space, thereby reducing the noise volume in local areas.

[0053] It should be noted that although some sound absorbers in the prior art use isosceles triangles or other irregular triangles, the inventors have found that isosceles triangles or other irregular triangles, which are represented by non-isosceles right triangles, objectively have some disadvantages, including the following disadvantages:

[0054] 1. The irregular triangular shape of the sound absorber will cause the reflection and propagation patterns of sound waves on its surface to be more complicated, making it difficult to accurately predict and control its sound absorption effect at different frequencies.

[0055] 2. The production of non-isosceles right triangles requires more complex molds and cutting processes, which will bring additional costs and labor time.

[0056] 3. When installing sound-absorbing bodies that are not isosceles right triangles, it will cause difficulties in splicing, which will affect the overall aesthetics and consistency of the sound absorption effect.

[0057] 4. The shape of a non-isosceles right triangle is not conducive to close arrangement, which will affect the space utilization, resulting in uneven sound absorption coverage or blind spots.

[0058] In another embodiment, a first wedge-shaped groove is formed between the first tip sound absorber and the second tip sound absorber; and a second wedge-shaped groove is formed between the second tip sound absorber and the third tip sound absorber.

[0059] Further, such as Figure 3 As shown, the first wedge-shaped groove and the second wedge-shaped groove are both right-angled wedge-shaped grooves. It has been verified that, compared with the non-right-angled grooves between the wedge tips in the sound-absorbing structure in the prior art, the right-angled wedge-shaped grooves have the following technical effects:

[0060] 1. The right-angled wedge-shaped groove can increase the surface area of ​​the sound absorber, which is conducive to more sound waves entering the sound-absorbing material and being absorbed. Especially for high-frequency sound waves, due to their short wavelength, they can be reflected and scattered multiple times in the groove, thereby improving the sound absorption efficiency.

[0061] 2. The right-angled wedge-shaped groove can make the sound waves propagate in a tortuous manner, thereby increasing the propagation path length of the sound waves inside the sound-absorbing material and prolonging the contact time between the sound waves and the sound-absorbing material, thereby increasing the effective sound absorption of the sound-absorbing material.

[0062] 3. The right-angled wedge-shaped groove helps guide sound waves in different directions to enter the sound-absorbing material at a suitable incident angle. Especially for the pointed sound absorber, this design can make fuller use of the wedge sound absorption principle and achieve effective absorption of sound waves of different frequencies.

[0063] 4. The right-angled wedge-shaped groove can reduce the direct reflection of sound waves on the surface of the sound absorber, thereby effectively improving the unevenness of the sound field and reducing acoustic defects such as standing waves and flutter echoes.

[0064] 5. The right-angled wedge-shaped groove has high stability in physical mechanics, which facilitates the mutual support and fixation between the sound absorbers, simplifies the installation process, and also provides a flexible modular design possibility for the overall acoustic treatment solution.

[0065] In another embodiment, the bottom and height of the first tip sound absorber, the second tip sound absorber and the third tip sound absorber are all 1 / 3 m.

[0066] In this embodiment, after multiple verifications, the bottom and height of the tip sound absorber are both designed to be 1 / 3m, which can bring the following technical effects:

[0067] 1. The size of the tip absorber is closely related to its sound absorption performance. Smaller sizes are more conducive to absorbing high-frequency sound waves. Because high-frequency sound waves have short wavelengths, they are more easily absorbed by the sound-absorbing material over a shorter distance. Therefore, a height and width of 1 / 3 meter can make the absorber perform better in the high-frequency band.

[0068] 2. Sound absorbers of this size can better match the wavelength of sound waves, ensuring that when sound waves are incident on the wedge sound absorber, they can be absorbed as much as possible instead of being reflected back.

[0069] 3. The size of the sound absorber allows the wedge sound absorbers to be densely arranged in a limited space, which not only meets the sound absorption requirements but also saves space.

[0070] 4. Based on the Helmholtz resonance principle, a sound absorber of a specific size can produce a strong resonant absorption effect on sound waves within a certain frequency range. It has been proven that when both the height and width are designed to be 1 / 3 meter, the sound absorber can effectively absorb the high-frequency noise generated by various vehicles on the road.

[0071] In summary, the bottom and height design of the above-mentioned cutting-edge sound absorber of 1 / 3m is precisely calculated and verified by experiments. It meets strict acoustic design standards and can achieve the best sound absorption effect within a certain frequency spectrum. Therefore, this size is an optimal parameter value that can be determined after comprehensive consideration of multiple factors.

[0072] In another embodiment, Figure 5 As shown, the first, second, and third tip absorbers are arranged facing away from the noise source. Specifically, the first right-angled side of each tip absorber (i.e., the bottom of each tip absorber) is connected to the top of the T-shaped device body. Neither the first right-angled side nor the hypotenuse face the noise source (or are referred to as facing away from the noise source). The second right-angled side of each tip absorber (i.e., the height of each tip absorber) is perpendicularly facing the noise source.

[0073] In this embodiment, it has been verified that arranging the tip sound absorber in the above-mentioned specific manner so as to face away from the road has the following effects:

[0074] 1. When the sound absorber is arranged near the noise source (such as the road), it can directly absorb most of the direct sound waves propagating in a straight line and reduce the direct propagation of noise.

[0075] 2. If the sound absorber faces the noise source, although it can absorb part of the sound waves from the main sound source, it may also cause some sound waves to focus or reflect behind the sound absorber, which in turn increases the noise in certain areas. Arranging it facing away from the noise source can avoid this situation as much as possible.

[0076] 3. When the tip sound absorber is arranged with its back to the noise source, sound waves can reach the sound absorber from all directions, including indirect reflected sound, so that the omnidirectional sound absorption characteristics of the sound absorber can be fully utilized to improve the overall noise reduction effect.

[0077] 4. As part of the sound barrier, the pointed sound absorber can form an effective sound barrier together with other sound insulation materials or structures when arranged facing away from the road, preventing noise from spreading to residential areas or other sensitive areas on the back side.

[0078] In summary, compared with setting it facing the noise source, arranging the pointed sound absorber with its back to the noise source can more effectively absorb, weaken and control the impact of traffic noise and other environmental noise on the surrounding environment.

[0079] Next, in another embodiment, the present invention is combined with Figures 7 to 12 The noise reduction effects of the sound barrier device with the above-mentioned sound barrier structure and the ordinary sound barrier device in the noise range of 315-1600Hz are explained.

[0080] Figure 7 This is a comparison curve of the insertion loss values ​​of the T-type sound barrier with or without top structure optimization. Figure 7 It can be seen that within the noise range of 315-1600Hz, the insertion loss of the ordinary T-shaped sound barrier is lower than that of the sound barrier structure with optimized top structure, and its noise reduction reaches 10-24dB. The sound barrier structure with optimized top structure has a certain improvement in the overall noise reduction effect of the entire frequency band of 315-1600Hz, with an average noise reduction of 3.7-11.6dB compared with the ordinary T-shaped sound barrier. This is because the sound barrier with optimized top structure can further change the diffraction path and distance of the sound wave, thereby improving the noise reduction effect.

[0081] Figure 8 The figure is a comparison diagram of the insertion loss values ​​of the T-shaped sound barrier of the present invention and other structures at a center frequency of 500Hz. Figure 8 It can be seen that when the center frequency is 500 Hz, compared with other structures, the structure of the utility model (ie Figure 8 The insertion loss value of the right angle of 45 degrees (reverse) is the highest, which means the sound wave absorption rate is the highest in the field of acoustics, so the noise reduction effect is the best.

[0082] Figure 9 The figure is a comparison diagram of the insertion loss values ​​of the T-shaped sound barrier of the present invention and other structures when the center frequency is 1000Hz. Figure 9 It can be seen that when the center frequency is 1000 Hz, compared with other structures, the structure of the present invention (i.e. Figure 9 The insertion loss value of the right angle of 45 degrees (reverse) is the highest, which means the sound wave absorption rate is the highest in the field of acoustics, so the noise reduction effect is the best.

[0083] Figure 10 The figure is a comparison diagram of the insertion loss values ​​of the T-shaped sound barrier of the present invention and other structures at a center frequency of 1600 Hz. Figure 10 It can be seen that when the center frequency is 1600 Hz, compared with other structures, the structure of the utility model (ie Figure 10 The insertion loss value of the right angle of 45 degrees (reverse) is the highest, which means the sound wave absorption rate is the highest in the field of acoustics, so the noise reduction effect is the best.

[0084] See also Figure 11 , which is a cloud diagram of the noise reduction effect of the sound barrier structure disclosed by the present utility model in actual application. Among them, the sound wave energy on the left side of the sound barrier structure is obviously stronger than that on the right side, indicating the feasibility of its noise reduction.

[0085] See further Figure 12 It is a comparative analysis of the insertion loss values ​​of the sound barrier structure disclosed in the present invention and other sound barrier structures in the prior art in various frequency bands. It can be found that in all frequency bands, the noise reduction effect of the sound barrier structure described in the present invention is better than that of other sound barrier structures in the prior art.

[0086] See further Figure 13 It is a comparative analysis of the insertion loss values ​​of the sound barrier structure disclosed in the present invention and other sound barrier structures in the prior art in various frequency bands. It can be found that in all frequency bands, the noise reduction effect of the sound barrier structure described in the present invention is better than that of other sound barrier structures in the prior art.

[0087] Therefore, under the premise of similar construction technology, the noise reduction effect of the sound barrier structure disclosed by the present invention is better.

[0088] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and not restrictive. A person skilled in the art can make many different forms under the guidance of this specification and without departing from the scope of protection of the claims of the present invention, and all of these forms are protected by the present invention.

Claims

1. A sound barrier structure arranged in a manner facing away from a noise source, comprising: T-type device body, The top of the T-shaped device body is provided with a sound absorbing structure, and the sound absorbing structure comprises a plurality of sequentially arranged tip sound absorbing bodies. Each tip sound absorber is an isosceles right triangle structure. The first right-angled side of each tip sound absorber serves as the bottom of each tip sound absorber and is connected to the top of the T-shaped device body. The first right-angled side and the oblique side are arranged in a manner that they do not face the noise source, that is, they face away from the noise source. The second right-angled side of each tip sound absorber serves as the height of each tip sound absorber and faces the noise source in a vertical manner.

2. The sound barrier structure according to claim 1, wherein: The sound absorber structure includes a first tip sound absorber.

3. The sound barrier structure according to claim 2, wherein: The sound absorber structure includes a second tip sound absorber.

4. The sound barrier structure according to claim 3, wherein: The sound absorber structure includes a third tip sound absorber.

5. The sound barrier structure according to claim 3, wherein: A first wedge-shaped groove is formed between the first tip sound absorber and the second tip sound absorber.

6. The sound barrier structure according to claim 4, wherein: A second wedge-shaped groove is formed between the second tip sound absorber and the third tip sound absorber.

7. The sound barrier structure according to claim 4, wherein: The bottom and height of the first tip sound absorber, the second tip sound absorber and the third tip sound absorber are all 1 / 3 m.

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