A method for calculating the impact of road traffic noise on super-large cross-section roads

Abstract

The present invention discloses a method for calculating the traffic noise impact of super-large cross-section roads, which solves the technical problem that there is a large deviation between the prediction results of existing noise prediction methods and actual monitoring data. It includes establishing an equivalent line sound source model according to the number of lanes, equivalenting the super-large cross-section road into multiple single lanes, and regarding each lane as a line sound source; calculating the noise impact of the lane close to the receiving point, including calculating the sound pressure level of the lane close to the receiving point; calculating the noise impact of the lane far from the receiving point, including calculating the sound pressure level of the lane far from the receiving point; and superimposing the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level. The present invention calculates the noise impacts of the lanes close to and far from the receiving point respectively and superimposes the sound pressure levels of all lanes, which can more comprehensively reflect the actual traffic noise distribution situation.

Description

Technical Field

[0001] The present invention relates to the technical field of traffic noise prediction, and particularly relates to a method for calculating the traffic noise impact of super-large cross-section roads. Background Art

[0002] With the rapid development of the economy, the demand for passenger and freight transportation on highways has increased rapidly. More and more highways have been expanded into multi-lane highways with eight or ten lanes to improve traffic capacity and driving speed. Compared with ordinary four-lane or six-lane highways, super-large cross-section highways with eight or more lanes have characteristics such as super-large cross-section and large traffic flow, and the traffic noise has a wide influence range and high intensity. At present, the calculation method for traffic noise of super-large cross-section highways with eight or more lanes is not yet perfect. The existing noise prediction models are mainly applicable to four-lane or six-lane highways and cannot accurately reflect the noise distribution characteristics of super-large cross-section roads.

[0003] Traffic noise is one of the main pollution sources in the environment along highways and has a significant impact on the quality of life and health of surrounding residents. Therefore, accurately predicting and evaluating the impact of traffic noise on super-large cross-section roads is of great significance for formulating effective noise control measures and environmental protection policies. The existing noise prediction methods usually rely on simplified sound source models and fail to fully consider the multi-lane characteristics of super-large cross-section roads, the influence of the central median strip, and the noise superposition effect of different lanes, resulting in a large deviation between the prediction results and the actual monitoring data.

[0004] In addition, as the road cross-section increases, the propagation path and attenuation characteristics of traffic noise become more complex. Traditional point source or line source models are difficult to accurately describe the noise distribution of super-large cross-section roads. Especially between different lanes near and far from the receiving point, the superposition effect and attenuation characteristics of noise are significantly different. Therefore, there is an urgent need for a method that can accurately calculate the traffic noise impact of super-large cross-section roads to solve the deficiencies in the existing technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for calculating the traffic noise impact of super-large cross-section roads to solve the technical problem that there is a large deviation between the prediction results of the existing noise prediction methods and the actual monitoring data.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A method for calculating the traffic noise impact of super-large cross-section roads provided by the present invention includes the following steps:

[0008] Step 1: Establish an equivalent line source model according to the number of lanes, and equivalent the super-large cross-section road into multiple single lanes, with each lane regarded as a line source;

[0009] The sound pressure level of the super-large cross-section road at any receiving point R in the roadside space L i Expressed as:

[0010] ;

[0011] in, L 0Ei is the average radiated noise level of lane i at the reference point, is the distance attenuation at any receiving point in space relative to the sound source reference point, C i Lane N i Other corrections at any receiving point in space;

[0012] Step 2: Calculate the noise impact of the lane close to the receiving point, including the sound pressure level calculation of the lane close to the receiving point;

[0013] Step 3: Calculate the noise impact of the lane far from the receiving point, including the sound pressure level calculation of the lane far from the receiving point;

[0014] Step 4: Add the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level.

[0015] Furthermore, in the equivalent line sound source model, the number of lanes is m=2n, there are n lanes on each side of the central divider, the distance between the receiving point and the road centerline is d, the width of each lane is W, and the width of the central divider is M; the lanes on the side close to the receiving point are designated as N1, N2...N n The lanes away from the receiving point are defined as F1, F2, ... F n .

[0016] Furthermore, the lane N near the receiving point i The sound pressure level of the noise generated at any receiving point R in space L Ni for:

[0017] ;

[0018] ;

[0019] ;

[0020] in, L 0Ei Lane N i The average radiated noise level at the reference point R0 is corrected based on the distance to the reference point, the vehicle speed, and the directivity of the single-vehicle source, combined with the height of the receiving point; g(θ) is the directivity correction; For lane N i Distance attenuation at any receiving point in space relative to the sound source reference point; C Ni For lane N i Other correction terms at any receiving point in space; r Ni Distance from the receiving point to lane N i Distance from the receiving point to the center line of the road; d is the horizontal distance from the projection of the receiving point on the ground to the center line of the road; M is the width of the central median; W is the width of each lane; h is the height of the receiving point.

[0021] Further, the sound pressure level L at any receiving point R in space on the side of the lane close to the receiving point N The superposition calculation formula for the sound energy of each lane is:

[0022] 。

[0023] Further, the noise generated by the lane F on the side far from the receiving point i The sound pressure level L at any receiving point R in space Fi Is:

[0024] ;

[0025] ;

[0026] ;

[0027] Wherein, For lane F i Distance attenuation at any receiving point in space relative to the sound source reference point; C Fi For lane F i Other correction terms at any receiving point in space; r Fi Distance from the receiving point to lane F i Distance from the center line of the road.

[0028] Further, the sound pressure level L at any receiving point R in space on the side of the lane far from the receiving point F The superposition calculation formula for the sound energy of each lane is:

[0029] 。

[0030] Further, in step 4, the sound pressure level L at the receiving point R for all lanes R Is the superposition of the sound energy of all lanes on both sides, and the calculation formula is:

[0031] 。

[0032] Based on the above technical solutions, the implementation of the present invention can at least produce the following technical effects:

[0033] (1) By establishing an equivalent line source model, the present invention equivalentizes an extra-large cross-section road into multiple single lanes, with each lane regarded as a line source, which can more accurately reflect the noise distribution characteristics of the extra-large cross-section road. The multi-lane characteristics of the extra-large cross-section road, the influence of the central median strip, and the noise superposition effect of different lanes are fully considered. By separately calculating the noise influence of the lanes on the side close to the receiving point and the side far from the receiving point and superimposing the sound pressure levels of all lanes, the distribution of the actual traffic noise can be more comprehensively reflected. Compared with the existing noise prediction models, the method of the present invention can significantly improve the prediction accuracy and reduce the deviation between the prediction result and the actual monitoring data.

[0034] (2) By introducing directivity correction and other correction terms, the present invention can more accurately describe the noise propagation and attenuation characteristics of the extra-large cross-section road, especially the significant differences in the superposition effect and attenuation characteristics of the noise between different lanes close to and far from the receiving point. This method is not only applicable to eight-lane expressways but can also be extended to extra-large cross-section roads with more lanes such as ten lanes and twelve lanes, having wide applicability. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0036] Figure 1 is a schematic plan view of the lane and the receiving point in the embodiment of the present invention;

[0037] Figure 2 is a schematic longitudinal section view of the radiation path of the equivalent sound source in the embodiment of the present invention;

[0038] Figure 3 is a diagram of the daytime attenuation of the traffic noise of eight lanes in the embodiment of the present invention;

[0039] Figure 4 is a diagram of the daytime attenuation of the traffic noise of twelve lanes in the embodiment of the present invention;

[0040] Figure 5 is a diagram showing the comparison between the calculated result and the monitored result in the embodiment of the present invention. Detailed Embodiments

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] A method for calculating the impact of road traffic noise on super-large cross-section roads includes the following steps:

[0043] Step 1: Establish an equivalent line source model according to the number of lanes, and equivalent the super-large cross-section road to multiple single lanes, with each lane regarded as a line source;

[0044] It should be noted that in the equivalent line source model, assume the number of lanes is m = 2n, with n lanes on each side of the central median strip, the distance from the projection of the receiving point on the ground to the road center line is d, the width of each lane is W, and the width of the central median strip is M; the lanes on the side close to the receiving point are sequentially designated as N1, N2... N n , and the lanes on the side far from the receiving point are sequentially defined as F1, F2... F n , as Figure 1 shown.

[0045] The sound pressure level L i at any receiving point R in the roadside space of the super-large cross-section road is expressed as:

[0046] ;

[0047] where L 0Ei is the average radiation noise level of the i-th lane at the reference point, C i is other correction terms of lane N i at any receiving point in space, and the calculation methods of L 0Ei and C i can be calculated according to the ecological environment standard "Technical Guidelines for Environmental Impact Assessment of Highway Construction Projects" (HJ 1358-2024); is the distance attenuation relative to the source reference point at any receiving point in space.

[0048] Step 2: Calculate the impact of the lanes on the side close to the receiving point, including calculating the sound pressure level of the lanes on the side close to the receiving point;

[0049] It should be noted that the average radiation noise level L 0EiIt is related not only to the distance r0 between the vehicle and the reference point, but also to the directivity of the single-vehicle radiation noise. The directivity correction is denoted as g(θ) (obtained by the method provided in the invention patent "Measurement and Evaluation Method for the Source Strength and Directivity of Vehicle Passing Noise" (Certificate No. 5162931)).

[0050] As Figure 2 shown, on the lane N on the side close to the receiving point i The sound pressure level L at any receiving point R in space generated by the noise Ni is:

[0051] ;

[0052] ;

[0053] ;

[0054] Among them, L 0Ei is the average radiation noise level of lane N i at the reference point R0, which is determined by correcting according to the reference point distance, vehicle speed, single-vehicle source strength directivity, and combining the receiving point height; g(θ) is the directivity correction; is the distance attenuation of lane N i relative to the source reference point at any receiving point in space; C Ni is the other correction term of lane N i at any receiving point in space; r Ni is the distance from the receiving point to the center line of lane N i ; d is the distance from the ground projection of the receiving point to the center line of the road; M is the width of the central median strip; W is the width of each lane; h is the vertical height of the receiving point from the road surface.

[0055] Therefore, the sound pressure level L of the lane on the side close to the receiving point at any receiving point R in space N is the superposition calculation formula of the sound energy of each lane as:

[0056] .

[0057] Step 3: Calculate the noise influence of the lane on the side far from the receiving point, including the calculation of the sound pressure level of the lane on the side far from the receiving point;

[0058] It should be noted that the average radiation noise level L at the reference point 0Ei is related not only to the distance r0 between the vehicle and the reference point, but also to the directivity of the single-vehicle radiation noise. The directivity correction is denoted as g(θ).

[0059] As Figure 2 shown, the lane F on the side far from the receiving point iThe sound pressure level L at any receiving point R in space generated by the noise Fi is:

[0060] ;

[0061] ;

[0062] ;

[0063] wherein, is the distance attenuation of lane F i relative to the sound source reference point at any receiving point in space; C Fi is the other correction term of lane F i at any receiving point in space; r Fi is the distance from the receiving point to the center line of lane F i road center line.

[0064] Therefore, the sound pressure level L at any receiving point R on the side away from the receiving point for each lane is F The superposition calculation formula for the sound energy of each lane is:

[0065] .

[0066] Step 4: Superpose the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level.

[0067] The sound pressure level L of all lanes at the receiving point R R is the superposition of the sound energy of all lanes on both sides, and the calculation formula is:

[0068] ;

[0069] The reference point R0 is based on the average radiation noise level at a horizontal distance of 7.5 m from the sound source. The average radiation sound level is calculated according to the actual vehicle type and vehicle speed, and the sound source directivity correction is performed, that is, the distance of r0 is 7.5 m.

[0070] The calculation results of the eight-lane traffic noise daytime attenuation diagram are as Figure 3 shown, and the twelve-lane traffic noise daytime attenuation diagram is as Figure 4 shown. Extract the 1st layer prediction and 9th layer prediction data from the eight-lane traffic noise daytime attenuation diagram and compare them with the data of the 1st layer monitoring and 9th layer monitoring. The results are as Figure 5 shown. The more prediction times are carried out, and the data are more in line with the actual monitoring.

[0071] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for calculating the impact of road traffic noise on super-large cross-section roads, characterized in that, Including the following steps: Step 1: Establish an equivalent line sound source model according to the number of lanes, equivalent the extra-large cross-section road to multiple single lanes, and regard each lane as a line sound source; In the equivalent line sound source model, the number of lanes is m = 2n, with n lanes on each side of the central median strip. The horizontal distance from the receiving point to the road center line is d, the width of each lane is W, and the width of the central median strip is M. The lanes on the side close to the receiving point are sequentially designated as N1, N2... N n , and the lanes on the side far from the receiving point are sequentially defined as F1, F2... F n ; The sound pressure level L at any receiving point R in the roadside space of the super-large cross-section road i is expressed as: ； where L 0Ei is the average radiation noise level of lane i at the sound source reference point R0, and ∆L i is the distance attenuation at any receiving point in space relative to the sound source reference point, and C i is the other correction term of lane N i at any receiving point in space, including the corrections for noise attenuation caused by highway longitudinal slope, pavement type, and ground absorption; Step 2: Calculate the noise impact of the lane on the side close to the receiving point, including the calculation of the sound pressure level of the lane on the side close to the receiving point; The lane N on the side close to the receiving point i The sound pressure level L of the noise generated at any receiving point R in space Ni is as follows: ； ； ； where, L 0Ei is the average radiated noise level at lane N i at the reference point R0, which is determined by correcting according to the reference point distance, vehicle speed, and single-vehicle source strength directivity, combined with the receiving point height; g(θ) is the directivity correction; ∆L Ni is the distance attenuation of lane N i relative to the source reference point at any receiving point in space; C Ni is the other correction term of lane N i at any receiving point in space; r Ni is the distance from the receiving point to the center line of lane N i ; d is the distance from the ground projection of the receiving point to the center line of the road; M is the width of the central median; W is the width of each lane; h is the vertical height of the receiving point from the road surface; Step 3: Calculate the noise impact of the lane on the side far from the receiving point, including the calculation of the sound pressure level of the lane on the side far from the receiving point; The lane F on the side away from the receiving point i The sound pressure level L of the noise generated at any receiving point R in space Fi is as follows: ； ； ； Among them, ∆L Fi is the distance attenuation of lane F i relative to the sound source reference point at any receiving point in space; C Fi is the other correction term of lane F i at any receiving point in space; r Fi is the distance from the receiving point to lane F i the center line of the road; Step 4: Superimpose the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level.

2. The method for calculating the influence of road traffic noise on super-large cross-section roads according to claim 1, wherein The sound pressure level L at any receiving point R in space on the lane side close to the receiving point N The superposition calculation formula for the sound energy of each lane is: 。 3. The method for calculating the influence of traffic noise on super-large cross-section roads according to claim 1, characterized in that The sound pressure level L at any receiving point R in space for the lane on the side away from the receiving point F The superposition calculation formula for the sound energy of each lane is: 。 4. The method for calculating the influence of road traffic noise on super-large cross-section roads according to claim 1, characterized in that In step 4, the sound pressure level L at the receiving point R for all lanes R is the superposition of the sound energy of all lanes on both sides, and the calculation formula is: 。

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