Road load shedding type sound barrier and load shedding adjusting method

Abstract

The invention discloses a road load shedding type sound barrier and a load shedding adjusting method. The sound barrier comprises an upper screen body plate, a lower screen body plate, load shedding mechanisms and steel stand columns, and the multiple load shedding mechanisms transversely arranged at equal intervals are arranged between the upper screen body plate and the lower screen body plate; the load shedding mechanism is composed of an impeller movably connected between the upper screen body plate and the lower screen body plate and a plurality of arc-shaped blades arranged on the impeller. By arranging the load shedding structure on the sound barrier, the sound barrier can still keep high safety under the action of strong wind, meanwhile, the load shedding structure can achieve multi-flow-direction energy capturing, in other words, the good capturing effect on wind energy in different wind directions can be achieved, the wind energy is converted into mechanical energy of the impeller, and the safety of the sound barrier is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of noise reduction, and in particular to a highway load-reducing sound barrier and a load-reducing adjustment method. Background Art

[0002] Urban rail transit has become an effective means of transportation to solve the problem of urban congestion with its characteristics of "large passenger volume, low pollution, convenience, speed, safety and comfort". However, while rail transit brings convenience to society, it also causes environmental noise pollution to people's living and working environment that cannot be ignored. In order to effectively prevent and control railway environmental noise pollution, the railway department often sets up sound barriers of varying heights and types along the railway.

[0003] However, most of the sound barriers widely used at present are of the non-ventilated type. When the sound barriers are hit by crosswinds, the wind loads they receive will inevitably be transferred downward, which will inevitably affect their stability and durability, especially in the bridge area. The increase in the load on the bridge may even affect its safety and service life. Coastal areas are often affected by monsoons and typhoons with high frequency, high wind speed and pressure, which is also a challenge for elevated bridges with sound barriers. In view of the aerodynamic pressure problem of the sound barrier, a sound barrier that can be ventilated and unloaded needs to be designed to solve the above problem. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a highway load-reducing sound barrier and a load-reducing adjustment method, which aims to solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a highway load-reducing sound barrier, comprising an upper screen plate, a lower screen plate, a load-reducing mechanism and steel columns, wherein a plurality of load-reducing mechanisms arranged equidistantly in the horizontal direction are arranged between the upper screen plate and the lower screen plate; the load-reducing mechanism is composed of an impeller movably connected between the upper screen plate and the lower screen plate and a plurality of arc-shaped blades arranged on the impeller.

[0006] Furthermore, the impeller includes a transmission main shaft, a rotor bearing, an upper base plate, a lower base plate impeller and arc-shaped blades. The upper base plate and the lower base plate are connected by the transmission main shaft, and a rotor bearing is provided at the connection between the upper base plate, the lower base plate and the transmission main shaft. The impeller is provided on the transmission main shaft, and a plurality of arc-shaped blades are provided on one side of the impeller; the top of the upper base plate is connected to the bottom of the upper screen plate, and the lower base plate is connected to the top of the lower screen plate.

[0007] Furthermore, a plurality of clamping plates are provided at the same position on the bottom of the upper base plate and the top of the lower base plate, and the arc-shaped blades are arranged on one side of the impeller through the clamping plates.

[0008] Furthermore, the arc-shaped blades are arranged on the concave side of the impeller and are arranged at equal intervals, and the size of the arc-shaped blades is one-fourth of the impeller.

[0009] Furthermore, both sides of the upper screen body plate and the lower screen body plate are connected and fixed by steel columns.

[0010] Furthermore, a solar folding plate is arranged on the top of the upper screen plate.

[0011] Furthermore, the upper and lower screen plates adopt aluminum alloy shells, and porous sound-absorbing materials are filled in the aluminum alloy shells; cavities are arranged inside the upper and lower screen plates, and louver holes are arranged outside the upper and lower screen plates.

[0012] Furthermore, magnetic blocks are arranged on the upper base plate and the lower base plate.

[0013] A load reduction adjustment method, applied to a highway load reduction type sound barrier, comprises the following steps: achieving different load reduction rates by adjusting the structural parameters of the load reduction mechanism;

[0014] The structural parameters that affect the load reduction mechanism include the number of curved blades b, the height-to-diameter ratio A R (H / D), overlap ratio δ(d / D), calculate the energy capture efficiency of the load reduction mechanism. The energy capture efficiency is usually calculated using the power coefficient C p , torque coefficient C m And the tip speed ratio λ is expressed as:

[0015]

[0016] Where ρ is the fluid density; M is the rotational torque; P TURBINE The energy captured by the load-reducing mechanism; P THEORY is the theoretical energy of the area swept by the unloading mechanism; U is the air speed; θ is the rotation angle of the unloading mechanism; ω is the rotation speed of the impeller; D is the diameter of the impeller; d is the diameter of the arc blade; T is the rotation period of the impeller; e is the gap between two adjacent arc blades; H is the height of the impeller.

[0017] Furthermore, when the wind energy threshold is met, the load reduction mechanism is connected to the permanent magnet synchronous generator.

[0018] Compared with the existing technology, the present invention has the following beneficial effects:

[0019] (1) The present invention provides a load-reducing structure on the sound barrier, so that the sound barrier can still maintain a high degree of safety under the influence of strong winds. At the same time, the load-reducing structure can achieve multi-directional energy capture, that is, it can capture wind energy from different wind directions very well, convert wind energy into mechanical energy of the impeller, and greatly improve the safety of the sound barrier.

[0020] (2) The present invention realizes the wind pressure load reduction requirements in different regions by adjusting the structural parameters of the load reduction structure. At the same time, the blades of the load reduction structure have the advantages of simple structure, low cost, easy processing, low operating speed and not easy to cavitation. In actual use, the sealing requirements are low, it is easy to maintain and maintain, and has a long service life.

[0021] (3) The present invention adds curved blades to the impeller, analyzes its aerodynamic characteristics based on the changes in the thickness, number and spacing of the curved blades through computational fluid dynamics simulation methods, and adds two curved blades. Compared with traditional blades, the energy capture efficiency is increased to 17%, and the structural design is simple, with a significant performance improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the sound barrier of the present invention.

[0023] Figure 2 It is a schematic diagram of the plane structure of the sound barrier of the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the load-reducing mechanism of the present invention.

[0025] Figure 4 It is a schematic diagram of the internal structure of the load reduction mechanism of the present invention.

[0026] Figure 5 It is a schematic diagram of the planar structure of the load-reducing mechanism of the present invention.

[0027] Figure 6 It is a schematic diagram of the card board structure of the present invention.

[0028] Figure 7 This is a power coefficient diagram of each load reduction structure with different numbers of curved blades of the present invention.

[0029] In the figure, 1. transmission main shaft; 2. rotor bearing; 3. upper base plate; 4. lower base plate; 5. impeller; 6. arc blades; 7. solar folding plate; 8. steel column; 9. upper screen plate; 10. load reduction mechanism; 11. lower screen plate; 12. clamping plate. DETAILED DESCRIPTION

[0030] like Figure 1-Figure 2As shown, the present invention provides a technical solution: a highway load-reducing sound barrier, comprising an upper screen plate 9, a lower screen plate 11, a load-reducing mechanism 10 and a steel column 8, wherein a plurality of load-reducing mechanisms 10 arranged equidistantly in the transverse direction are arranged between the upper screen plate 9 and the lower screen plate 11; the load-reducing mechanism 10 is composed of an impeller 5 movably connected between the upper screen plate 9 and the lower screen plate 11 and a plurality of arc-shaped blades 6 arranged on the impeller 5; through the load-reducing mechanism 10, strong crosswind and train wind can be effectively utilized and converted for ventilation and pressure relief, thereby improving the service life of the sound barrier.

[0031] like Figure 3-Figure 5 As shown, the impeller 5 includes a transmission main shaft 1, a rotor bearing 2, an upper base plate 3, a lower base plate 4, an impeller 5 and arc-shaped blades 6. The upper base plate 3 and the lower base plate 4 are connected through the transmission main shaft 1, and the rotor bearing 2 is provided at the connection between the upper base plate 3, the lower base plate 4 and the transmission main shaft 1. The impeller 5 is provided on the transmission main shaft 1, and a plurality of arc-shaped blades 6 are provided on one side of the impeller 5; the top of the upper base plate 3 is connected to the bottom of the upper screen plate 9, and the lower base plate 4 is connected to the top of the lower screen plate 11.

[0032] like Figure 6 As shown, a plurality of clamping plates 12 are disposed at the same position at the bottom of the upper base plate 3 and the top of the lower base plate 4 , and the arc-shaped blades 6 are disposed at one side of the impeller 5 through the clamping plates 12 .

[0033] The arc blades 6 are disposed inside the concave side of the impeller 5 and are arranged at equal intervals. The size of the arc blades 6 is one quarter of the size of the impeller 5 .

[0034] Among them, the impeller 5 and the curved blades 6 are made of glass fiber reinforced plastic (GRP), and the upper base plate 3 and the lower base plate 4 are made of epoxy resin; the impeller 5 and the curved blades 6 made of glass fiber reinforced plastic (GRP) have small resistance and are easy to push, and have good lightweight and durability, and good mechanical properties.

[0035] The upper screen body plate 9 and the lower screen body plate 11 are connected and fixed at both sides by steel columns 8 .

[0036] Among them, a solar folding plate 7 is arranged on the top of the upper screen plate 9; the solar folding plate 7 can not only increase the noise reduction effect of the sound barrier but also generate electricity by using solar energy through its own bending design, converting solar energy into electrical energy for storage, and the stored electrical energy can be used to power nearby street lights; the solar folding plate 7 can be set to Y-shape, T-shape, etc. according to needs.

[0037] The upper screen plate 9 and the lower screen plate 11 are made of aluminum alloy shells, and porous sound-absorbing materials are filled in the aluminum alloy shells.

[0038] The upper screen plate 9 and the lower screen plate 11 are provided with cavities inside, and the upper screen plate 9 and the lower screen plate 11 are provided with louver holes outside.

[0039] Among them, magnetic blocks are arranged on the upper base plate 3 and the lower base plate 4. Through the arranged magnetic blocks, in a windless state, the impeller 5 in the load-reducing mechanism 10 will not rotate, thereby ensuring the airtightness of the sound barrier; and the upper base plate 3 and the lower base plate 4 can block the fluid flowing through the edge of the arc-shaped blade 6, which helps to prevent the fluid on the concave surface of the impeller 5 from leaking, thereby increasing the pressure generated on the blade surface of the impeller 5, increasing the resistance difference formed on the surface of the impeller 5, and then enhancing the lift generated by the Magnus effect when the object is rotating.

[0040] A load reduction adjustment method is applied to a highway load reduction sound barrier, comprising the following steps: achieving different load reduction rates by adjusting the structural parameters of the load reduction mechanism 10.

[0041] Based on the parameters that affect the energy capture coefficient of the load-reducing mechanism 10, that is, the structural parameters of the load-reducing mechanism 10 (the number of arc-shaped blades 6 b, the number of vertical layers of the load-reducing mechanism 10, whether the load-reducing mechanism 10 has a base plate, and the height-to-diameter ratio A R (H / D), overlap ratio δ(d / D), shape of the curved blade 6, etc.), calculate the energy capture efficiency of the load reduction mechanism 10. The energy capture efficiency is usually calculated using the power coefficient C p , torque coefficient C m And the tip speed ratio λ is expressed as:

[0042]

[0043] Where ρ is the fluid density, which is generally the air density; M is the rotational torque; P TURBINE Energy captured by the load-reducing mechanism 10; P THEORY is the theoretical energy of the area swept by the unloading mechanism 10; U is the air speed; θ is the rotation angle of the unloading mechanism 10; ω is the rotation speed of the impeller 5; D is the diameter of the impeller 5; d is the diameter of the arc blade 6; T is the rotation period of the impeller 5; e is the gap between two adjacent arc blades 6; H is the height of the impeller 5.

[0044] When the wind energy is relatively large, the load reduction mechanism 10 is connected to the permanent magnet synchronous generator, and the solar folding plate 7 is used to improve the power generation efficiency.

[0045] The tip speed ratio is the ratio of the linear velocity of the tip of the arc-shaped blade 6 to the wind speed TSR. By using this as the independent variable and combining equations (1), (2), and (3) to analyze the structural parameters of the load-reducing mechanism 10 in the computational fluid dynamics software (CFD), it can be seen that the upper base plate 3 and the lower base plate 4 play a blocking role on the fluid flowing through the edge of the impeller 5, which helps to prevent the fluid on the concave surface of the impeller 5 from leaking out, thereby increasing the pressure generated on the impeller 5 and increasing the resistance difference formed on the surface of the impeller 5. At the same time, the upper base plate 3 and the lower base plate 4 have a blocking effect on the fluid flowing through the edge of the impeller 5. The best effect is achieved when the diameter of the plate 4 is 1.1 times the diameter of the impeller 5. The effect is better when the height-to-diameter ratio is 6 under the two conditions of constant impeller 5 diameter and swept area. However, from the perspective of the overall size of the sound barrier and the requirements for meeting noise reduction, the height-to-diameter ratio should not exceed 7. The performance is better when the number of impellers 5 is 2. Considering the size of the load-reducing mechanism 10, the load-reducing requirement can be met when the number of vertical layers of the load-reducing mechanism 10 is 1. The simulation analysis is performed on different numbers of quarter-sized arc-shaped blades 6 set on one side of the impeller 5, such as Figure 7 As shown, it is found that the load unloading efficiency of the load unloading mechanism 10 is optimal when two quarter-sized arc-shaped blades 6 are added.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highway load-reducing sound barrier, comprising an upper screen plate (9), a lower screen plate (11), a load-reducing mechanism (10) and a steel column (8), Features: A plurality of load-reducing mechanisms (10) arranged equidistantly in the transverse direction are provided between the upper screen plate (9) and the lower screen plate (11); the load-reducing mechanism (10) is composed of an impeller (5) movably connected between the upper screen plate (9) and the lower screen plate (11), and a plurality of arc-shaped blades (6) provided on the impeller (5).

2. A highway load-reducing sound barrier according to claim 1, Features: The impeller (5) comprises a transmission main shaft (1), a rotor bearing (2), an upper base plate (3), a lower base plate (4), an impeller (5) and arc-shaped blades (6); the upper base plate (3) and the lower base plate (4) are connected via the transmission main shaft (1); a rotor bearing (2) is provided at the connection between the upper base plate (3), the lower base plate (4) and the transmission main shaft (1); an impeller (5) is provided on the transmission main shaft (1); and a plurality of arc-shaped blades (6) are provided on one side of the impeller (5); the top of the upper base plate (3) is connected to the bottom of the upper screen plate (9), and the lower base plate (4) is connected to the top of the lower screen plate (11).

3. A highway load-reducing sound barrier according to claim 2, Features: A plurality of clamping plates (12) are arranged at the same position on the bottom of the upper base plate (3) and the top of the lower base plate (4), and the arc-shaped blades (6) are arranged on one side of the impeller (5) through the clamping plates (12).

4. A highway load-reducing sound barrier according to claim 3, Features: The arc-shaped blades (6) are arranged on the concave side of the impeller (5) and are arranged at equal intervals. The size of the arc-shaped blades (6) is one quarter of the size of the impeller (5).

5. A highway load-reducing sound barrier according to claim 4, Features: The upper screen body plate (9) and the lower screen body plate (11) are connected and fixed at both sides by steel columns (8).

6. A highway load-reducing sound barrier according to claim 5, Features: A solar folding plate (7) is arranged on the top of the upper screen plate (9).

7. A highway load-reducing sound barrier according to claim 6, Features: The upper screen plate (9) and the lower screen plate (11) are made of an aluminum alloy shell, and a porous sound-absorbing material is filled in the aluminum alloy shell; cavities are arranged inside the upper screen plate (9) and the lower screen plate (11), and louver holes are arranged outside the upper screen plate (9) and the lower screen plate (11).

8. A highway load-reducing sound barrier according to claim 7, Features: Magnetic blocks are arranged on the upper base plate (3) and the lower base plate (4).

9. A load reduction adjustment method, applied to a highway load reduction sound barrier according to any one of claims 1 to 8, comprising the following steps: achieving different load reduction rates by adjusting the structural parameters of the load reduction mechanism (10); Based on the structural parameters affecting the load reduction mechanism (10), including the number b of the curved blades (6), the height-to-diameter ratio A R (H / D), overlap ratio δ(d / D), calculate the energy capture efficiency of the load reduction mechanism (10), the energy capture efficiency is usually calculated using the power coefficient C p , torque coefficient C m And the tip speed ratio λ is expressed as: Where ρ is the fluid density; M is the rotational torque; P TURBINE P is the energy captured by the load-reducing mechanism (10); THEORY is the theoretical energy of the area swept by the load-reducing mechanism (10); U is the air speed; θ is the rotation angle of the load-reducing mechanism (10); ω is the rotation speed of the impeller (5); D is the diameter of the impeller (5); d is the diameter of the arc blade (6); T is the rotation period of the impeller (5); e is the gap between two adjacent arc blades (6); and H is the height of the impeller (5).

10. A load reduction regulation method according to claim 9, Features: When the wind energy threshold is met, the load reduction mechanism (10) is connected to the permanent magnet synchronous generator.

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