Method for calculating traffic noise influence of oversized section road

Abstract

The invention discloses a method for calculating traffic noise influence of a super-large section road. The method solves the technical problem that a prediction result of an existing noise prediction method has a large deviation from actual monitoring data. The method comprises the steps that an equivalent line sound source model is established according to the number of lanes, the super-large-section road is equivalent to multiple single lanes, and each lane is regarded as a line sound source; calculating the noise influence of the lane close to one side of the receiving point, including calculating the sound pressure level of the lane close to one side of the receiving point; calculating the noise influence of the lane far away from the receiving point, including calculating the sound pressure level of the lane far away from the receiving point; and superposing the sound pressure levels of all lanes at the receiving points to obtain a total sound pressure level. According to the method, the noise influence of the lanes close to the receiving point and the noise influence of the lanes far away from the receiving point are calculated respectively, the sound pressure levels of all the lanes are superposed, and the actual traffic noise distribution situation can be reflected more comprehensively.

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 an extra-large cross-section road. Background Art

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

[0003] Traffic noise is one of the main pollution sources in the environment along expressways 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 extra-large cross-section roads is of great significance for formulating effective noise control measures and environmental protection policies. The existing noise prediction methods usually based on simplified sound source models do not fully consider the multi-lane characteristics of extra-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 extra-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 extra-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 an extra-large cross-section road 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: A method for calculating the traffic noise impact of an extra-large cross-section road provided by the present invention includes the following steps: Step 1: Establish an equivalent line source model according to the number of lanes, and equivalent the extra-large cross-section road into multiple single lanes, with each lane regarded as a line source; The sound pressure level at any receiving point R in the roadside space of the extra-large cross-section roadL i Expressed as: ; Wherein, L 0Ei is the average radiated noise level of lane i at the reference point, is the distance attenuation from the sound source reference point to any receiving point in space, C i is lane N i other correction terms at any receiving point in space; Step 2: Calculate the noise impact of the lane close to the receiving point, including the calculation of the sound pressure level of the lane close to the receiving point; Step 3: Calculate the noise impact of the lane far from the receiving point, including the calculation of the sound pressure level of the lane far from the receiving point; Step 4: Superimpose the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level.

[0007] Furthermore, in the equivalent line source model, the number of lanes is m = 2n, with n lanes on each side of the central median strip, the 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 close to the receiving point are sequentially designated as N 1 , N 2 ... N n , and the lanes far from the receiving point are sequentially defined as F 1 , F 2 ... F n .

[0008] Furthermore, the sound pressure level i generated by the lane N L Ni at any receiving point R in space is: ; ; ; Wherein, L 0Ei is the average radiated noise level of lane N i at the reference point R 0 , determined by correcting according to the reference point distance, vehicle speed and single-source intensity directivity, combined with the receiving point height; g(θ) is the directivity correction; is the distance attenuation of lane N i from the sound source reference point to any receiving point in space; C Ni is the other correction term of lane N i at any receiving point in space; r NiDistance from the receiving point to lane N i Distance from the center line of the road; d is the horizontal 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 height of the receiving point.

[0009] Further, 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: .

[0010] Further, for the lane F on the side far from the receiving point i The sound pressure level L of the noise generated at any receiving point R in space Fi is: ; ; ; Among them, 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 distance from the center line of the road.

[0011] Further, the sound pressure level L at any receiving point R in space on the lane side far from the receiving point F The superposition calculation formula for the sound energy of each lane is: .

[0012] Further, in the step 4, the sound pressure level L at the receiving point R of all lanes R is the superposition of the sound energy of all lanes on both sides, and the calculation formula is: .

[0013] Based on the above technical solutions, the implementation of the present invention can at least produce the following technical effects: (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 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.

[0014] (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 noise superposition effect and attenuation characteristics 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. Brief Description of the Drawings

[0015] 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 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.

[0016] Figure 1 It is a schematic plan view of the lane and the receiving point in the embodiment of the present invention; Figure 2 It is a schematic longitudinal view of the radiation path of the equivalent sound source in the embodiment of the present invention; Figure 3 It is a diagram of the daytime attenuation of eight-lane traffic noise in the embodiment of the present invention; Figure 4 It is a diagram of the daytime attenuation of twelve-lane traffic noise in the embodiment of the present invention; Figure 5 It is an effect diagram of the calculation result and the monitoring result in the embodiment of the present invention. Detailed Embodiment

[0017] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. In addition, the technical solutions between 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 conflicts or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0018] A method for calculating the impact of traffic noise on super-large cross-section roads includes the following steps: 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; It should be noted that in the equivalent line source model, let the number of lanes be 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 lane closest to the receiving point is sequentially designated as N 1 、N 2 ……N n , and the lanes far from the receiving point are sequentially defined as F 1 、F 2 ……F n , as Figure 1 shown.

[0019] 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: ; wherein, L 0Ei is the average radiation noise level of the i-th lane at the reference point, C i is the other correction term 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 reference point of the sound source at any receiving point in space.

[0020] 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; It should be noted that the average radiation noise level L 0 at the reference point R 0EiIn addition to the distance r between the vehicle and the reference point 0 it is also related to the directivity of the single-vehicle radiation noise, and 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)).

[0021] As Figure 2 shown, the sound pressure level L at any receiving point R in space of the noise generated in lane N on the side close to the receiving point i is: Ni ; ; ; ; wherein, L 0Ei is the average radiation noise level of lane N i at the reference point R 0 which is determined by correction in combination with the receiving point height according to the reference point distance, vehicle speed and single-vehicle source strength directivity; g(θ) is the directivity correction; is the distance attenuation of lane N i relative to the sound 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 from the receiving point to the road surface.

[0022] Therefore, the sound pressure level L at any receiving point R in space of the lane on the side close to the receiving point is the superposition calculation formula of the sound energy of each lane as: N ; ;

[0023] 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; It should be noted that the average radiation noise level L at the reference point 0Ei is related not only to the distance r between the vehicle and the reference point 0 but also to the directivity of the single-vehicle radiation noise, and the directivity correction is denoted as g(θ).

[0024] As Figure 2 shown, the sound pressure level L at any receiving point R in space of the noise generated in lane F on the side far from the receiving point i is: Fi ; ; ; ; Among them, is lane F i is the distance attenuation at any receiving point in space relative to the sound source reference point; C Fi is lane F i is other correction terms at any receiving point in space; r Fi is the distance from the receiving point to lane F i the distance from the road center line.

[0025] Therefore, the sound pressure level L at any receiving point R in space on the side of the lane far from the receiving point F is the superposition calculation formula of the sound energy of each lane as: .

[0026] Step 4: Superpose the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level.

[0027] 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: ; reference point R 0 is based on the average radiation noise level at a horizontal distance of 7.5 m from the sound source. Calculate the average radiation sound level according to the actual vehicle type and vehicle speed, and perform the directivity correction of the sound source, that is, the distance of r 0 is 7.5 m.

[0028] The calculation results of the daytime attenuation diagram of the traffic noise of eight lanes are as Figure 3 shown, and the daytime attenuation diagram of the traffic noise of twelve lanes is as Figure 4 shown. Extract the 1st layer prediction and 9th layer prediction data from the daytime attenuation diagram of the traffic noise of eight lanes, 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.

[0029] The above shows and describes 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. What is described in the above embodiments and the specification only illustrates 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 all 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 traffic noise on a super-large section road, characterized in that: The following steps are involved: Step 1: Establish an equivalent line sound source model according to the number of lanes, and treat the super-large section road as multiple single lanes, with each lane regarded as a line sound source; The sound pressure level L of the super-large section road at any receiving point R in the roadside space i It is expressed as: ； Among them, L 0Ei is the average radiated noise level of lane i at the sound source reference point R0, is the distance attenuation at any receiving point in space relative to the sound source reference point, C i For lane N i Other correction items at any receiving point in space, including corrections for noise attenuation caused by highway longitudinal slope, road surface type, and ground absorption; 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; 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; Step 4: Add the sound pressure levels of all lanes at the receiving point to obtain the total sound pressure level.

2. The method for calculating the impact of traffic noise on a super-large section road according to claim 1, characterized in that: In the equivalent line sound source model, the number of lanes is m=2n, there are n lanes on both sides of the central dividing strip, the horizontal distance between the receiving point and the center line of the road is d, the width of each lane is W, and the width of the central dividing strip is M; the lanes on the side close to the receiving point are designated as N1, N2...N n The lanes far from the receiving point are defined as F1, F2, ... F n .

3. The method for calculating the impact of traffic noise on a super-large section road according to claim 1, characterized in that: The lane N near the receiving point i The sound pressure level L of the generated noise at any receiving point R in space Ni for: ； ； ； Among them, L 0Ei For lane N i The average radiated noise level at the reference point R0 is corrected and determined based on the distance from the reference point, the vehicle speed, and the directivity of the single-vehicle source strength, combined with the height of the receiving point; g(θ) is the directivity correction; For lane N i The distance attenuation of 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 is the distance from the receiving point to lane N i d is the distance from the receiving point to the center line of the road; M is the width of the central dividing strip; W is the width of each lane; h is the vertical height from the receiving point to the road surface.

4. The method for calculating the impact of traffic noise on a super-large section road according to claim 3, characterized in that: The sound pressure level L of the lane close to the receiving point at any receiving point R in space N The superposition calculation formula for the sound energy of each lane is: 。 5. The method for calculating the impact of traffic noise on a super-large section road according to claim 1, characterized in that: The lane F on the side away from the receiving point i The sound pressure level L of the generated noise at any receiving point R in space Fi for: ； ； ； in, For lane F i The distance attenuation of 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 is the distance between the receiving point and lane F i Distance from the center line of the road.

6. The method for calculating the impact of traffic noise on a super-large section road according to claim 5, characterized in that: The sound pressure level L of the lane far from the receiving point at any receiving point R in space F The superposition calculation formula for the sound energy of each lane is: 。 7. The method for calculating the impact of traffic noise on a super-large section road according to claim 1, characterized in that: In step 4, 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: 。

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