Aerodynamic design method of high-speed railway ventilation type noise reduction structure and its application

Abstract

The present application belongs to the technical field of aerodynamic design of noise reduction structure in railway industry, and relates to an aerodynamic design method of a ventilation type noise reduction structure of high-speed railway and application thereof, comprising the following steps: determining a target value of load reduction rate of the ventilation type noise reduction structure; determining the size and shape of the ventilation type noise reduction structure; determining a load reduction rate calculation formula of the ventilation type noise reduction structure under different conditions, and calculating the load reduction rate of the ventilation type noise reduction structure under different ventilation hole distances L , chamfer radius R conditions according to the formula; determining the applicable conditions in the load reduction rate calculation formula; and determining the load reduction rate of the ventilation type noise reduction structure meeting the applicable conditions through the load reduction rate calculation formula. The load reduction rate calculation formula of the ventilation type noise reduction structure under different conditions proposed by the method clearly defines the target value of the load reduction rate to be reached under different working conditions, avoids large modeling analysis and large-scale testing, is suitable for ordinary engineering technicians, has strong engineering applicability, has a wide application range, and is conducive to the design of ventilation and noise reduction structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aerodynamic design of noise reduction structure, specifically to the technical field of aerodynamic design of noise reduction structure applied to railway industry, and particularly relates to an aerodynamic design method of a ventilation type noise reduction structure for high-speed railway and application thereof. BACKGROUND

[0002] The increase of train speed causes the increase of noise, the increase of train fluctuating wind load, the amplification of aerodynamic effect, and the more severe test of trackside equipment safety.

[0003] The fluctuating wind pressure of the train acting on the sound barrier increases by 30% when the speed of the high-speed railway is increased from 350 km / h to 400 km / h, which leads to the increase of the fatigue cyclic load of the sound barrier unit board, the column and the bolt fastening, and the intensification of the structural dynamic response. In addition, the existing sound barrier does not have the function of ventilation and pressure relief, which leads to the further increase of the load acting on the infrastructure and forms a safety hazard.

[0004] The ventilation type noise reduction structure is specially designed for the ventilation hole, realizes "ventilation without sound", guarantees the noise reduction effect, utilizes the pressure relief and load reduction to enhance the stability of the noise reduction structure, makes the load acting on the infrastructure not exceed the design limit, and ensures the safety of the train. The existing design of the ventilation type noise reduction structure pays more attention to its acoustic function, and the quantitative relationship between the pressure relief and load reduction capacity, the structure parameters of the ventilation hole and the pressure relief and load reduction is not clear. The existing calculation of the load reduction rate of the ventilation type noise reduction structure generally uses large commercial software, which has long modeling period, low calculation efficiency and high specialization, so that the engineering and technical personnel cannot quickly complete the aerodynamic fine design of the ventilation type noise reduction structure, which restricts the engineering application of the ventilation type noise reduction structure. SUMMARY

[0005] In order to solve the problem that the quantitative relationship of the load reduction rate of the existing ventilation type noise reduction structure is not clear and cannot guide the design of the noise reduction structure, the present application provides an aerodynamic design method of the ventilation type noise reduction structure. The present application establishes the load reduction evaluation index and the calculation formula of the load reduction rate, provides the quantitative index for the pressure relief and load reduction performance of the ventilation type noise reduction structure, and is beneficial to promote the design technology innovation of the ventilation type noise reduction structure. The calculation formula of the load reduction rate of the ventilation type noise reduction structure avoids large modeling calculation and large-scale test, improves the calculation efficiency, saves manpower and material resources, is suitable for ordinary engineering and technical personnel, has stronger engineering applicability, wider application range, and is convenient for carrying out the aerodynamic fine design of the ventilation type noise reduction structure, and provides technical guidance for improving the safety performance of the noise reduction structure in complex environment and accelerating the marketization application.

[0006] The technical solution is as follows:

[0007] The application discloses an aerodynamic design method of a ventilation type noise reduction structure of a high-speed railway.

[0008] A1, determining a load reduction rate target value of the ventilation type noise reduction structure, and a calculation formula is as follows:

[0009] Formula I;

[0010] wherein, represents the load reduction rate, and respectively represent train pulsating wind loadings of an equal height 1-span ordinary noise reduction structure and a 1-span ventilation type noise reduction structure under the same working condition;

[0011] A2, determining the size and shape of the ventilation type noise reduction structure;

[0012] A3, determining a load reduction rate calculation formula of the ventilation type noise reduction structure under different conditions, and calculating the load reduction rate of the ventilation type noise reduction structure under different ventilation hole spacing L , chamfer radius R conditions according to the formula;

[0013] A4, determining the applicable conditions in the load reduction rate calculation formula;

[0014] A5, determining the load reduction rate of the ventilation type noise reduction structure meeting the applicable conditions through the load reduction rate calculation formula in step A3.

[0015] In one embodiment, step A3 comprises the following steps:

[0016] A31, calculating the load reduction rate of the ventilation type noise reduction structure through different ventilation hole spacing L ;

[0017] A32, calculating the load reduction rate of the ventilation type noise reduction structure through different chamfer radius R ;

[0018] A33, calculating the load reduction rate of the ventilation type noise reduction structure through different ventilation hole spacing L and different chamfer radius R .

[0019] In one embodiment, the ventilation hole spacing in step A31, and the load reduction rate calculation formula of the ventilation type noise reduction structure is as follows:

[0020] Formula II;

[0021] wherein, is the load reduction rate of the ventilation type noise reduction structure, L is the ventilation hole spacing;

[0022] In one embodiment, the different chamfer radius, ventilation type noise reduction structure load reduction rate calculation formula in step A32 is:

[0023] Formula three;

[0024] In the formula, is the ventilation type noise reduction structure load reduction rate, R is the chamfer radius;

[0025] In one embodiment, the different ventilation hole spacing, different chamfer radius, ventilation type noise reduction structure load reduction rate calculation formula in step A33 is:

[0026] Formula four;

[0027] In the formula, is the ventilation type noise reduction structure load reduction rate, R is the chamfer radius, L is the ventilation hole spacing.

[0028] In one embodiment, step A4 is aerodynamic design by the load reduction rate calculation formula in steps A31, A32 and A33 to determine the applicable conditions in the load reduction rate calculation formula.

[0029] The second application object of the application is to provide a ventilation type noise reduction structure designed using the aerodynamic design method for the ventilation type noise reduction structure applied to high-speed railway.

[0030] In one embodiment, the inverted L-shaped support is located at the bottom of the noise reduction structure, and 11-23 ordinary ventilation and sound absorption structures are arranged in sequence above it, with a top ventilation and sound absorption structure at the top. The geometric shape and size of the ordinary ventilation and sound absorption structures are consistent, the geometric shape and size of the ordinary upper chamfer and ordinary upper chamfer of each ordinary ventilation and sound absorption structure are consistent, the top lower chamfer of the top ventilation and sound absorption structure is completely consistent with the ordinary lower chamfer of the ordinary ventilation and sound absorption structure, and the upper part of the top ventilation and sound absorption structure is flush with the top of the H-shaped steel column.

[0031] In one embodiment, the air layer between the ventilation and sound absorption structures is the ventilation hole, and the gap between two ordinary ventilation and sound absorption structures and the gap between the ordinary ventilation and sound absorption structure and the top ventilation and sound absorption structure are consistent, i.e. the spacing of the ventilation hole. L， This noise reduction structure uses ventilation holes for ventilation to reduce the pulsating load received by the noise reduction structure.

[0032] In one embodiment, the height H2 of the common ventilation sound absorption structure is 0.15m~0.20m, the width W is 0.14m~0.15m, the length X is 1.8m~2m, the height H1 of the top ventilation sound absorption structure is 0.15m~0.20m, the width W is 0.14m~0.15m, the length X is 1.8m~2m, the chamfer is a rounded chamfer with a radius of 0m~0.05m, and the included angle is 45°~150°.

[0033] In one embodiment, when the ventilation type noise reduction structure is aerodynamically designed by the three load reduction rate calculation formulas of steps A31, A32 and A33, the geometric parameters and structural characteristics of the ventilation type noise reduction structure need to meet the following applicable conditions:

[0034] The applicable condition of the calculation formula of step A31 is, R =0.02m, 0.011m≤ L ≤0.051m;

[0035] The applicable condition of the calculation formula of step A32 is, L =0.041m, 0m≤ R ≤0.05m;

[0036] The applicable condition of the calculation formula of step A33 is, 0m≤ R ≤0.05m, 0.011m≤ L ≤0.051m.

[0037] In combination with all the above technical solutions, the advantages and positive effects possessed by the present application are:

[0038] 1. The present application establishes the train pulsating wind load reduction rate of a 1-span ventilation type noise reduction structure as a load reduction evaluation index, proposes a load reduction rate calculation formula, provides a quantitative index for the pressure relief and load reduction performance of the ventilation type noise reduction structure, and is conducive to promoting the design technology innovation of noise reduction structures.

[0039] 2. The present application clearly defines the relationship between the spacing of the ventilation holes, the chamfer radius and the load reduction rate of the ventilation type noise reduction structure, provides technical guidance for improving the safety performance of noise reduction structures in complex environments, and accelerates the marketization application.

[0040] 3. The ventilation type noise reduction structure load reduction rate calculation formula proposed by the present application avoids large modeling analysis and large-scale testing, is suitable for ordinary engineering technicians, has stronger engineering applicability, has a wider application range, and is conducive to the aerodynamic design of noise reduction structures.

[0041] In addition, as the creative auxiliary evidence of the present application, it is also embodied in the following important aspects:

[0042] 1. The aerodynamic design method of the ventilation type noise reduction structure can design noise reduction structures suitable for different scenes according to actual needs, and can consider noise reduction function and safety for different speed levels, especially high-speed railways above 350 km / h. The ventilation type noise reduction structure designed according to the aerodynamic design method of the ventilation type noise reduction structure can ensure that the noise reduction effect does not decrease and the load on the noise reduction structure does not increase after the train speed is increased without large-scale modification of the infrastructure. Not only can the infrastructure reconstruction cost of hundreds of millions of yuan be saved, but also a favorable position can be occupied in the market of billions of yuan of sound barriers.

[0043] 2. The aerodynamic design method of the ventilation type noise reduction structure can not only be applied to high-speed railways to reduce fluctuating wind load, but also can be used for other scenes requiring ventilation and noise reduction, and the types of products formed by transformation are various, and the market prospect is broad.

[0044] 3. In order to solve the technical problem that the quantitative relationship of the load reduction rate of the ventilation type noise reduction structure is not clear, the aerodynamic design method of the ventilation type noise reduction structure is designed, the load reduction rate calculation formula of the ventilation type noise reduction structure is proposed, and the technical blank of predicting the load reduction effect of the ventilation type noise reduction structure at home and abroad is filled. BRIEF DESCRIPTION OF DRAWINGS

[0045] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure;

[0046] Figure 1 The flow chart of the aerodynamic design method of the ventilation type noise reduction structure of the present application;

[0047] Figure 2 The schematic diagram of the ventilation type noise reduction structure of the present application;

[0048] Figure 3 The longitudinal section view of the ventilation and sound absorption structure of the present application;

[0049] Figure 4 The comparative curve graph of the load reduction rate of the ventilation type noise reduction structure obtained by fitting the formula and numerical simulation of different ventilation hole distances;

[0050] Figure 5 The comparative curve graph of the load reduction rate of the ventilation type noise reduction structure obtained by fitting the formula and numerical simulation of different chamfer radii;

[0051] Figure 6 The comparative surface graph of the load reduction rate of the ventilation type noise reduction structure obtained by fitting the formula and numerical simulation of different ventilation hole distances and different chamfer radii.

[0052] In the figure: 1, inverted L-shaped support, 2, H-shaped steel column, 3, ventilation and sound absorption structure, 3a, common ventilation and sound absorption structure, 3b, top ventilation and sound absorption structure, 3c, common upper chamfer, 3d, common lower chamfer, 3e, top lower chamfer, 4, ventilation channel. DETAILED DESCRIPTION

[0053] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific details described herein. Thus, the present application is not intended to be limited to the following disclosed specific embodiments.

[0054] The present application will be described in further detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application. Example 1

[0055] An aerodynamic design method of a ventilation type noise reduction structure, comprising the following steps:

[0056] A1, determining a target value of the load reduction rate of the ventilation type noise reduction structure, the calculation formula being:

[0057] Formula I;

[0058] wherein, represents the load reduction rate, and respectively represent the train fluctuating wind load received by the common noise reduction structure and the ventilation type noise reduction structure of the same height and 1 span under the same working condition. In Example 1, the train fluctuating wind load of the common noise reduction structure of 3.3m height and 1 span for a high-speed railway at a speed of 400km / h is 5731N, the design requirement for the train fluctuating wind load received by the ventilation type noise reduction structure of 1 span is 4405N, and the calculated load reduction rate is 23.1%.

[0059] A2, determining the geometric parameters and structural features of the ventilation type noise reduction structure;

[0060] The ventilation type noise reduction structure is composed of one 0.3m high inverted L-shaped support 1, two H-shaped steel columns 2 and 18 ventilation sound absorption structures 3 arranged along the height direction, and the height of the noise reduction structure is 3.3m; the inverted L-shaped support 1 is located at the bottom of the noise reduction structure, and 17 ordinary ventilation sound absorption structures 3a are arranged in turn above it, and the uppermost is one top ventilation sound absorption structure 3b; the shape and size of the ordinary ventilation sound absorption structure 3a are consistent, the height H2 is 0.165m, the width W is 0.14m, and the length A is 1.96m, the radius R of the ordinary upper chamfer 3c and the ordinary upper chamfer 3d of each ordinary ventilation sound absorption structure 3a is 0m~0.05m, which is in the form of inverted V-shaped, the included angle is 45°~150°, and the included angle of the V-shaped structure in Example 1 is 120°; the height H1 of the top ventilation sound absorption structure 3b is 0.195m, the width W is 0.14m, and the length A is 1.96m, the top lower chamfer 3e of the top ventilation sound absorption structure 3b is completely consistent with the ordinary lower chamfer 3d of the ordinary ventilation sound absorption structure 3a, the radius R is 0m~0.05m, which is in the form of inverted V-shaped, the included angle is 45°~150°, and the included angle of the V-shaped structure in Example 1 is 120°, the upper part of the top ventilation sound absorption structure 3b is flush with the top of the H-shaped steel column 2; the air layer between the ventilation sound absorption structures 3 is the ventilation hole channel 4, which can ventilate, relieve pressure and reduce load; the gap between two ordinary ventilation sound absorption structures 3a and the gap between the ordinary ventilation sound absorption structure 3a and the top ventilation sound absorption structure 3b are consistent, which is the spacing L of the ventilation hole channel; the ventilation sound absorption structure 3 is embedded in the H-shaped steel column 2 at both ends, and the inverted L-shaped support 1 is connected with the H-shaped steel column 2 by bolts.

[0061] A3, the load reduction rate of the ventilation type noise reduction structure under different spacing L of ventilation hole channel and chamfer radius R is calculated according to the formula, including;

[0062] A31, the spacing of different ventilation hole channels, the load reduction rate calculation formula of the ventilation type noise reduction structure:

[0063] Formula two;

[0064] In the formula, is the load reduction rate of the ventilation type noise reduction structure, L is the spacing of the ventilation hole channel, and the results are shown in Table 1;

[0065] Table 1 original data of fitting formula two

[0066] Pitch of ventilation channels / m Relief ratio / % 0.051 43.6 0.046 41.0 0.041 36.5 0.036 32.5 0.031 27.3 0.026 22.5 0.021 17.8 0.016 12.7 0.011 8.0

[0067] Table 1 shows the results of the numerical calculations, which were performed using numerical simulation software for three-dimensional modeling. First, a three-dimensional model of the noise reduction structure was established. The train bogie was retained, and the noise reduction structure was defined as an aluminum plate, with measuring points placed on its surface. The area around the computational domain was defined as the pressure outlet, and the entire computational domain adopted the AAT k~w turbulence model. Fluid dynamics software was used, employing overlapping mesh technology to realize the train's horizontal motion. The flow field around the train was defined as donor mesh elements (marked as active mesh elements), while the flow field in the noise reduction structure area and the roadbed was defined as recipient mesh elements (marked as inactive mesh elements). All meshes used hexahedral meshes, with a maximum mesh element size of 1m. Due to the presence of linear surfaces on the train, the surface mesh size ranged from approximately 0.01m to 0.06m. The maximum mesh sizes for the noise reduction structure and the roadbed surface were 0.03m and 0.125m, respectively. During the numerical simulation, the time step of the computational model was set to 0.002 seconds. Initially, each time step underwent 10 iterations. After the residuals converged, each time step was reduced to 5 iterations until the calculation was complete. The train pulsating wind loads on the ordinary noise reduction structure and the ventilated noise reduction structure were obtained, and the load reduction rate was obtained by substituting them into Equation 1. The data in Tables 2 and 3 were calculated using the above simulation method.

[0068] Data fitting is performed using second-order polynomial approximation to obtain the spacing of different ventilation ducts, and the second formula for calculating the load reduction rate of the ventilation-type noise reduction structure is derived. (For example...) Figure 4 As shown, the curves comparing the load reduction rate of the ventilation-type noise reduction structure with the spacing of different ventilation ducts obtained from the fitting formula and numerical simulation are presented. For example, when... L When the radius is 0.044m, the load reduction rate obtained by numerical simulation is 39.2%, while the load reduction rate obtained by formula 2 is 38.4%, with an error of 0.8%. By comparing the results of numerical simulation and formula calculation, it can be proved that formula 2 has high accuracy.

[0069] For A32, the formula for calculating the load reduction rate of ventilated noise reduction structures with different chamfer radii is as follows:

[0070] Formula 3;

[0071] In the formula, For ventilation-type noise reduction structure load reduction rate, R The chamfer radius is shown in Table 2.

[0072] Table 2. Original data for fitting formula 3

[0073] Chamfer radius / m Relief ratio / % 0 28.0 0.005 30.4 0.01 33.0 0.015 35.2 0.02 36.5 0.025 38.0 0.03 38.2 0.035 38.3 0.04 38.4 0.045 39.0 0.05 39.4

[0074] Table 2 shows the results of numerical calculations. Data fitting was performed using a third-order polynomial approximation to obtain formula three for calculating the load reduction rate of the ventilation-type noise reduction structure with different chamfer radii. (For example...)Figure 5 As shown, the curves compare the load reduction rates of the ventilation-type noise reduction structure with different chamfer radii obtained from the fitting formula and numerical simulation. For example, when... R When the radius is 0.022m, the load reduction rate obtained by numerical simulation is 37.1%, while the load reduction rate obtained by formula 3 is 36.3%, with an error of 0.8%. By comparing the results of numerical simulation and formula calculation, it can be proved that formula 3 has high accuracy.

[0075] A33, Calculation formula for load reduction rate of ventilation-type noise reduction structure with different ventilation duct spacing and different chamfer radii:

[0076] Formula 4;

[0077] In the formula, The load reduction rate of the ventilation-type noise reduction structure is given by R, where R is the chamfer radius and L is the spacing of the ventilation ducts. The results are shown in Table 3.

[0078] Table 3. Original data for fitting formula four

[0079] Pitch of ventilation channels / mChamfer radius / m 0.051 0.046 0.041 0.036 0.031 0.026 0.021 0.016 0.011 0 31.8% 29.6% 28.0% 23.9% 21.5% 20.6% 15.9% 11.2% 6.7% 0.005 35.6% 33.2% 30.4% 27.1% 25.0% 21.6% 17.1% 11.5% 7.9% 0.01 39.8% 36.4% 33.0% 28.7% 26.1% 21.7% 17.7% 12.6% 7.9% 0.015 42.3% 39.2% 35.4% 31.3% 26.6% 22.4% 17.8% 12.6% 8.0% 0.02 43.6% 41.0% 36.5% 32.5% 27.3% 22.5% 17.8% 12.7% 8.0% 0.025 45.7% 42.2% 38.0% 32.6% 27.4% 22.6% 17.8% 12.8% 8.1% 0.03 46.4% 43.3% 38.1% 32.8% 27.9% 22.6% 17.9% 12.9% 8.2% 0.035 47.8% 43.9% 38.2% 33.3% 28.1% 22.7% 18.0% 12.9% 8.2% 0.04 48.0% 44.0% 38.4% 33.4% 28.5% 22.8% 18.3% 12.9% 8.2% 0.045 48.1% 44.4% 39.0% 33.5% 29.0% 22.8% 18.3% 13.0% 8.3% 0.05 48.3% 44.6% 39.4% 33.5% 29.0% 22.9% 18.4% 13.1% 8.4%

[0080] Table 3 shows the results of numerical calculations. Surface data fitting was performed using polynomial approximation (the spacing L of the ventilation ducts is third-order, and the chamfer radius R is second-order) to obtain the calculation formula for the load reduction rate of the ventilation-type noise reduction structure with different ventilation duct spacings and chamfer radii. (See formula four.) Figure 6 As shown, the fitted formula and numerical simulation are used to compare the load reduction rate of the ventilation-type noise reduction structure with different ventilation duct spacings and different chamfer radii. For example, when... L =0.03m R When the radius is 0.027m, the load reduction rate obtained from numerical simulation is 29.3%, while the load reduction rate obtained from Formula 4 is 27.0%, with an error of 2.3%. By comparing the results of numerical simulation and the results calculated by the formula, it can be proved that Formula 4 has high accuracy.

[0081] Based on the calculation results of Formula 1, if the load reduction rate of the noise reduction structure for a 400 km / h high-speed railway needs to reach 23.3%, then Formula 4 can be used to obtain the result. R =0.02m, L The load reduction rate can meet the requirements when the height is 0.031m. The calculation formula for the load reduction rate of the ventilation-type noise reduction structure proposed in this method under different conditions avoids large-scale modeling analysis and large-scale experiments. It is suitable for ordinary engineering technicians, has stronger engineering applicability, wider application, and is conducive to the design of noise reduction structures.

[0082] A4. Determine the applicable conditions for the load reduction rate calculation formulas of A31, A32, and A33.

[0083] A31 the applicable condition of the calculation formula is, R = 0.02m, 0.011m≤ L ≤ 0.051m;

[0084] A32 the applicable condition of the calculation formula is, L = 0.041m, 0m≤ R ≤ 0.05m;

[0085] A33 the applicable condition of the calculation formula is, 0m≤ R ≤ 0.05m, 0.011m≤ L ≤ 0.051m.

[0086] The formula is not applicable beyond the above defined range.

[0087] A5, determining the load reduction rate of the ventilation type noise reduction structure that meets the applicable condition through the load reduction rate calculation formula in steps A31, A32 and A33.

[0088] Application Example 1:

[0089] The aerodynamic design method of the ventilation type noise reduction structure of the high-speed railway provided in the above embodiment can also run on a computer device, which comprises at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor implements the method in the above embodiment when executing the computer program.

[0090] Application Example 2:

[0091] The aerodynamic design method of the ventilation type noise reduction structure of the high-speed railway provided in the above embodiment can also run on a computer readable storage medium, which stores a computer program, wherein the computer program is executable by a processor to implement the method in the above embodiment.

[0092] Application Example 3:

[0093] The aerodynamic design method of the ventilation type noise reduction structure of the high-speed railway provided in the above embodiment can also run on an information data processing terminal, which is used to provide a user input interface to implement the method in the above embodiment when executed on an electronic device, and the information data processing terminal is not limited to a mobile phone, a computer, or a switch.

[0094] Application Example 4:

[0095] The aerodynamic design method of the ventilation type noise reduction structure of the high-speed railway provided in the above embodiment can also run on a server, which is used to provide a user input interface to implement the method in the above embodiment when executed on an electronic device.

[0096] Application Example 5:

[0097] The aerodynamic design method of the high-speed railway ventilation type noise reduction structure provided by the above-mentioned embodiments can also be run in a computer program product, and when the computer program product is run on an electronic device, the electronic device can implement the method in the above-mentioned embodiments when executed.

[0098] The present application can implement all or part of the steps in the above-mentioned embodiment methods by a computer program to instruct related hardware, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of each method embodiment can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms, etc. The computer readable medium at least includes any entity or device capable of carrying the computer program code to the photographing device / terminal equipment, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk, etc.

[0099] The above-mentioned is only the preferred embodiment of the present application, and it should be pointed out that for the ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for aerodynamic design of a high-speed railway ventilation type noise reduction structure, characterized in that: It comprises the following steps: A1, determining the target value of the load reduction rate of the ventilation type noise reduction structure; A2, determining the size and shape of the ventilation type noise reduction structure; A3, determine the load reduction rate calculation formula of the ventilation type noise reduction structure under different conditions, and calculate the load reduction rate of the ventilation type noise reduction structure under different conditions according to the formula L , chamfer radius R conditions, including the following steps: A31, by the spacing of different ventilation channels L The load reduction rate of the ventilation type noise reduction structure is calculated, and the calculation formula of the load reduction rate of the ventilation type noise reduction structure is: Formula Two In the formula, is the load reduction rate of the vented noise reduction structure, L is the pitch of the vent channels; A32, by different chamfer radius R The load reduction rate of the ventilation type noise reduction structure is calculated, and the calculation formula of the load reduction rate of the ventilation type noise reduction structure is: Formula Three Formula Three In the formula, is the load reduction rate of the ventilation type noise reduction structure, R is the chamfer radius; A33, by the spacing of different ventilation channels L , different chamfer radius R , the load reduction rate of the ventilation type noise reduction structure is calculated, and the load reduction rate calculation formula of the ventilation type noise reduction structure is: Formula 4 In the formula, is the load reduction rate of the ventilation type noise reduction structure, R is the chamfer radius, L is the pitch of the ventilation holes. A4, aerodynamic design is performed through the load reduction rate calculation formula in steps A31, A32 and A33 to determine the applicable conditions in the load reduction rate calculation formula; When the ventilation type noise reduction structure is aerodynamically designed through the three load reduction rate calculation formulas in steps A31, A32 and A33, the size and shape of the ventilation type noise reduction structure need to meet the following applicable conditions: Step A31 the applicable condition of the calculation formula is, R = 0.02m, 0.011m≤ L ≤ 0.051m; Step A32 the applicable condition of the calculation formula is, L = 0.041m, 0m≤ R ≤ 0.05m; Step A33 the applicable condition of the formula is 0m≤ R ≤0.05m, 0.011m≤ L ≤0.051m; A5, determining the load reduction rate of the ventilation type noise reduction structure that meets the applicable conditions through the load reduction rate calculation formula in step A3.

2. The aerodynamic design method of a high-speed railway ventilation type noise reduction structure according to claim 1, characterized in that: In step A1, the calculation formula of the load reduction rate is: Formula One wherein, denotes the reduction rate, and respectively represent the train fluctuating wind load received by the equal height 1-span ordinary noise reduction structure and the 1-span ventilation type noise reduction structure under the same working condition.

3. A vented noise reducing structure, characterized by: It is structurally designed using the aerodynamic design method of the high-speed railway ventilation type noise reduction structure according to any one of claims 1-2, and the ventilation type noise reduction structure is composed of one 0.3m high inverted L-shaped support (1), two H-shaped steel columns (2), and 12-24 ventilation and sound absorption structures (3) arranged along the height direction.

4. The vented noise reducing structure of claim 3, wherein: The inverted L-shaped support (1) is located at the bottom of the noise reduction structure, and 11-23 ordinary ventilation and sound absorption structures (3a) are arranged in turn above it, and the top is one top ventilation and sound absorption structure (3b). The geometric shape and size of the ordinary ventilation and sound absorption structure (3a) are consistent, the geometric shape and size of the ordinary upper chamfer (3c) and the ordinary lower chamfer (3d) of each ordinary ventilation and sound absorption structure (3a) are consistent, the top lower chamfer (3e) of the top ventilation and sound absorption structure (3b) is completely consistent with the ordinary lower chamfer (3d) of the ordinary ventilation and sound absorption structure (3a), and the upper part of the top ventilation and sound absorption structure (3b) is flush with the top of the H-shaped steel column (2). The air layer between the ventilation sound absorption structures (3) is the ventilation hole (4), and the gap between two ordinary ventilation sound absorption structures (3a) and the gap between the ordinary ventilation sound absorption structure (3a) and the top ventilation sound absorption structure (3b) are consistent, that is, the spacing of the ventilation hole L ; The ventilation and sound absorption structure (3) is embedded in the H-shaped steel column (2) at both ends, and the inverted L-shaped support (1) is connected with the H-shaped steel column (2) through bolts.

5. A computer device, characterized by: The computer device comprises a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor to make the processor execute the aerodynamic design method of the high-speed railway ventilation type noise reduction structure according to any one of claims 1-2.

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