CN108842642A - A kind of road traffic noise decay calculation method for the sound barrier that frequency is equivalent - Google Patents
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Abstract
本发明提出了一种频率等效的声屏障的道路交通噪声衰减计算方法，该方法首先通过测量或计算获得道路交通噪声倍频程数据；接着选取一个声程差序列和一个频率序列，该频率序列称为标尺频率，并计算在每个声程差序列元素和每个频率序列元素下的道路交通噪声衰减量；然后计算在道路交通噪声倍频程数据的中心频率和每个声程差序列元素下的道路交通噪声衰减量，计算每个声程差序列元素下的总衰减量；最后计算和的差值，并找出使该差值达到最小的频率值，该频率值即为等价频率值。
The present invention proposes a method for calculating road traffic noise attenuation of a frequency-equivalent sound barrier. The method first obtains road traffic noise octave data through measurement or calculation; then selects a sound path difference sequence and a frequency sequence , the frequency sequence is called the scale frequency, and the road traffic noise attenuation under each sound path difference sequence element and each frequency sequence element is calculated ; Then calculate the center frequency of the road traffic noise octave data and the road traffic noise attenuation under each sound path difference sequence element , to calculate the total attenuation under each sound path difference sequence element ; final calculation and and find the frequency value that minimizes the difference , the frequency value is the equivalent frequency value.
Description
技术领域technical field
本发明涉及于道路交通噪声计算领域，更具体的，涉及一种频率等效的声屏障的道路交通噪声衰减计算方法。The invention relates to the field of road traffic noise calculation, and more specifically, to a method for calculating road traffic noise attenuation of a frequency-equivalent sound barrier.
背景技术Background technique
道路交通噪声是城市噪声污染的主要来源。建立声屏障是降低道路交通噪声对道路周边区域影响的重要措施之一。在建立声屏障之前需要预先计算声屏障的降噪效果，以确定声屏障的高度和材料选用。另外，在噪声地图应用过程中，需要对比未实施声屏障降噪的与实施声屏障降噪后两种情况的差异，采用实际测量方式计算该差异显然是一种成本高、效率低的方法。因此，需要一种在声屏障作用下的道路交通噪声衰减计算方法来解决以上问题。Road traffic noise is the main source of urban noise pollution. The establishment of sound barriers is one of the important measures to reduce the impact of road traffic noise on the surrounding areas of the road. Before building the sound barrier, it is necessary to pre-calculate the noise reduction effect of the sound barrier to determine the height and material selection of the sound barrier. In addition, in the application process of the noise map, it is necessary to compare the difference between the situation without the implementation of the noise barrier and the implementation of the noise reduction. It is obviously a costly and inefficient method to calculate the difference by using the actual measurement method. Therefore, a method for calculating road traffic noise attenuation under the action of sound barriers is needed to solve the above problems.
目前，常用的在声屏障作用下的道路交通噪声衰减计算方法只考虑了声程差一项因素，而噪声的衰减因素不仅与噪声源和噪声接收点之间的声程差有关，而且与噪声源的频率有关。为此，有学者将噪声源的频率纳入在声屏障作用下的道路交通噪声衰减计算因素中，通过计算某种车型或某种车流的道路交通噪声各中心频率的声压级衰减量，获得道路交通噪声声压级的总衰减量。At present, the commonly used road traffic noise attenuation calculation method under the action of sound barriers only considers the sound path difference, and the noise attenuation factor is not only related to the sound path difference between the noise source and the noise receiving point, but also to the noise depends on the frequency of the source. For this reason, some scholars include the frequency of the noise source into the calculation factor of road traffic noise attenuation under the action of the sound barrier, and obtain the road traffic noise attenuation by calculating the sound pressure level attenuation of each center frequency of road traffic noise of a certain vehicle type or a certain traffic flow. The total attenuation of the sound pressure level of traffic noise.
但是这种方法需要获取某种车型或某种车流的倍频程数据，而且需要计算每一个中心频率对应的衰减量，计算流程繁琐，不适合工程应用。因此，本发明提出一种频率等效的声屏障的道路交通噪声衰减计算方法，即计算某种车型或某种车流道路交通噪声的等价频率，同种车型或车流的道路交通噪声在声屏障作用下的衰减效果可以用等价频率直接计算，简化了衰减效果的计算流程。However, this method needs to obtain octave data of a certain vehicle type or a certain traffic flow, and needs to calculate the attenuation corresponding to each center frequency. The calculation process is cumbersome and not suitable for engineering applications. Therefore, the present invention proposes a method for calculating road traffic noise attenuation of a frequency-equivalent sound barrier, that is, to calculate the equivalent frequency of a certain vehicle type or certain vehicle flow road traffic noise, and the road traffic noise of the same type of vehicle type or vehicle flow in the sound barrier The attenuation effect under the action can be directly calculated by the equivalent frequency, which simplifies the calculation process of the attenuation effect.
发明内容Contents of the invention
本发明目的在于简化声屏障影响下的道路交通噪声衰减计算，提供一种频率等效的声屏障的道路交通噪声衰减计算方法，得到道路交通噪声的等效频率，用于简化声屏障作用下声压级插入损失的计算。The purpose of the present invention is to simplify the calculation of road traffic noise attenuation under the influence of sound barriers, provide a method for calculating road traffic noise attenuation of sound barriers with equivalent frequencies, and obtain the equivalent frequency of road traffic noise, which is used to simplify the noise reduction under the action of sound barriers. Calculation of pressure level insertion loss.
为解决上述技术问题，本发明采用的技术方案是：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种频率等效的声屏障的道路交通噪声衰减计算方法，包含以下步骤：A method for calculating road traffic noise attenuation of a frequency-equivalent sound barrier, comprising the following steps:
(a) 通过测量获得某种车型或车流的道路交通噪声倍频程数据；(a) Obtain octave data of road traffic noise of a certain type of vehicle or flow of traffic through measurement;
(b) 选取一个声程差序列和一个频率序列，该频率序列称为标尺频率， (b) Select a sound path difference sequence and a frequency sequence , this sequence of frequencies is called the scale frequency,
并计算在每个声程差序列元素和每个频率序列元素下的道路交通噪声衰减量； And calculate the road traffic noise attenuation under each sound path difference sequence element and each frequency sequence element ;
(c)计算在道路交通噪声倍频程数据的中心频率序列和每个声程差序列元素下的 道路交通噪声衰减量，计算每个声程差序列元素下的总衰减量； (c) Calculation of the center frequency series in the road traffic noise octave data and the road traffic noise attenuation under each sound path difference sequence element , to calculate the total attenuation under each sound path difference sequence element ;
(d)计算和的差值，并找出使该差值达到最小的频率值，该频率 值即为等价频率值，利用等价频率值直接计算声屏障作用下的噪声衰减量。 (d) calculation and and find the frequency value that minimizes the difference , the frequency value That is, the equivalent frequency value, using the equivalent frequency value to directly calculate the noise attenuation under the action of the sound barrier.
优选地，所述在声屏障影响下道路交通噪声各中心频率的声压级衰减量之和等价于道路交通噪声在某个等价频率下声压级衰减量，方法核心是计算该等价频率。Preferably, the sum of the sound pressure level attenuation of each center frequency of the road traffic noise under the influence of the sound barrier is equivalent to the sound pressure level attenuation of the road traffic noise at a certain equivalent frequency, and the core of the method is to calculate the equivalent frequency.
优选地，在所述步骤(a)中，道路交通噪声倍频程数据可以是任意一种倍频程，常用1/3倍频程数据。Preferably, in the step (a), the octave data of road traffic noise may be any octave, usually 1/3 octave data.
优选地，在所述步骤(b)中，声程差序列是一个一维向量，它的元素按从小到大 排列，元素个数决定等价频率值的计算精度和效率。 Preferably, in said step (b), the sound path difference sequence is a one-dimensional vector whose elements Arranged from small to large, the number of elements determines the calculation accuracy and efficiency of the equivalent frequency value.
优选地，在所述步骤(b)中，标尺频率序列是一个一维向量，它的元素按从 小到大排列，元素个数决定等价频率值的计算精度和效率，通常情况下，标尺频率序列 常用取值方式有两种：1）以1/3倍频程的中心频率作为标尺频率序列；2）以分辨率为1Hz的 递增序列作为标尺频率序列。 Preferably, in said step (b), the scale frequency sequence is a one-dimensional vector whose elements Arranged from small to large, the number of elements determines the calculation accuracy and efficiency of the equivalent frequency value, usually, the scale frequency sequence There are two commonly used methods of value selection: 1) use the center frequency of 1/3 octave as the scale frequency sequence; 2) use the incremental sequence with a resolution of 1 Hz as the scale frequency sequence.
优选地，在所述步骤(b)中，每个声程差序列元素和每个频率序列元素下的道路交 通噪声衰减量的计算公式为： Preferably, in the step (b), the road traffic noise attenuation amount under each sound path difference sequence element and each frequency sequence element The calculation formula is:
式中为声速，取值为340m/s。 In the formula is the speed of sound, the value is 340m/s.
优选地，在所述步骤(c)中，声倍频程数据的中心频率序列根据选用的倍频程 确定。 Preferably, in said step (c), the center frequency sequence of the acoustic octave data Determined according to the selected octave.
优选地，在所述步骤(c)中，在道路交通噪声倍频程数据的中心频率序列和每 个声程差序列元素下的道路交通噪声衰减量的计算公式为： Preferably, in the step (c), in the center frequency sequence of the road traffic noise octave data and the road traffic noise attenuation under each sound path difference sequence element The calculation formula is:
式中为声速，取值为340m/s。 In the formula is the speed of sound, the value is 340m/s.
优选地，在所述步骤(c)中，每个声程差序列元素下的总衰减量的计算公式 如下： Preferably, in said step (c), the total attenuation under each sound path difference sequence element The calculation formula is as follows:
式中是测量获得道路交通噪声倍频程数据的中心频率对应的声压级；是测量获得 道路交通噪声倍频程数据的总声压级；是声音衰减后每个中心频率对应的声压 级；是声音衰减后的总声压级；是每个声程差序列元素下的总衰减量。 In the formula It is the sound pressure level corresponding to the center frequency of the road traffic noise octave data obtained by measurement; It is the total sound pressure level obtained by measuring the octave band data of road traffic noise; is the sound pressure level corresponding to each center frequency after sound attenuation; is the total sound pressure level after sound attenuation; is the total attenuation under each sound path difference sequence element.
优选地，在所述步骤(d)中，和的差值的计算公式为： Preferably, in said step (d), and The formula for calculating the difference is:
式中为声程差序列的元素个数。 In the formula is the sound path difference sequence the number of elements.
优选地，在所述步骤(d)中，等价频率值的计算公式为： Preferably, in said step (d), the equivalent frequency value The calculation formula is:
即使差值达到最小的频率值。 Even if the difference reaches the minimum frequency value .
优选地，在所述步骤(d)中，利用等价频率值直接计算同种车型或车流在声屏障作用下的噪声衰减量的计算公式为：Preferably, in the step (d), the calculation formula for directly calculating the noise attenuation of the same type of vehicle or vehicle flow under the action of the sound barrier by using the equivalent frequency value is:
式中是声程差，为声速，取值为340m/s。 In the formula is the sound path difference, is the speed of sound, the value is 340m/s.
与现有技术相比，本发明具有以下优点：Compared with the prior art, the present invention has the following advantages:
本发明提出一种频率等效的声屏障的道路交通噪声衰减计算方法。该方法把在声屏障影响下道路交通噪声各中心频率的声压级衰减量之和等价于道路交通噪声在某个等价频率下声压级衰减量。通过计算获得某种车型或某种车流的等价频率之后，在工程应用中，当需要计算同种车型或同种车流受到声屏障影响后的噪声衰减量的时候，直接利用等价频率计算噪声衰减量，不再需要通过测量车型或车流的倍频程数据和计算各中心频率的声压级衰减量的方式获得噪声衰减量，大大简化了声屏障作用下道路交通噪声声压级插入损失的计算流程。The invention proposes a method for calculating road traffic noise attenuation of a frequency-equivalent sound barrier. In this method, the sum of the sound pressure level attenuation of each center frequency of road traffic noise under the influence of the sound barrier is equivalent to the sound pressure level attenuation of road traffic noise at an equivalent frequency. After obtaining the equivalent frequency of a certain vehicle type or a certain traffic flow through calculation, in engineering applications, when it is necessary to calculate the noise attenuation of the same type of vehicle type or the same type of traffic flow affected by the sound barrier, the equivalent frequency is directly used to calculate the noise Attenuation, it is no longer necessary to obtain the noise attenuation by measuring the octave data of the vehicle type or traffic flow and calculating the sound pressure level attenuation of each center frequency, which greatly simplifies the calculation of the insertion loss of the sound pressure level of road traffic noise under the action of the sound barrier Calculation process.
附图说明Description of drawings
图1是本发明流程示意图。Fig. 1 is a schematic flow chart of the present invention.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本发明作进一步的详细说明，应当理解，此处所描述的具体实施例仅仅用于解释本发明，并不用于限定本发明。The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.
如图1所示，本发明提供一种频率等效的声屏障的道路交通噪声衰减计算方法。通过以下步骤实现：As shown in FIG. 1 , the present invention provides a method for calculating road traffic noise attenuation of a frequency-equivalent sound barrier. This is achieved through the following steps:
步骤1：通过测量获得某种车型或车流的道路交通噪声倍频程数据，该倍频程数据可以是任意一种倍频程，常用1/3倍频程数据。Step 1: Obtain the octave data of road traffic noise of a certain vehicle type or traffic flow through measurement. The octave data can be any octave, and 1/3 octave data is commonly used.
步骤2：选取一个声程差序列和一个频率序列，该频率序列称为标尺频率，并 计算在每个声程差序列元素和每个频率序列元素下的道路交通噪声衰减量。声 程差序列和标尺频率序列都是递增序列，元素个数决定等价频率值的计算精度和效 率，在每个声程差序列元素和每个频率序列元素下的道路交通噪声衰减量的计 算公式为： Step 2: Select a sound path difference sequence and a frequency sequence , the frequency sequence is called the scale frequency, and the road traffic noise attenuation under each sound path difference sequence element and each frequency sequence element is calculated . Acoustic path difference sequence and scale frequency sequence Both are increasing sequences, the number of elements determines the calculation accuracy and efficiency of the equivalent frequency value, and the road traffic noise attenuation under each sound path difference sequence element and each frequency sequence element The calculation formula is:
式中是标尺频率序列的元素；是声程差序列的元素；为声速，取值为340m/s。 In the formula is the scale frequency sequence Elements; is the sound path difference sequence Elements; is the speed of sound, the value is 340m/s.
步骤3：计算在道路交通噪声倍频程数据的中心频率序列和每个声程差序列元 素下的道路交通噪声衰减量，计算每个声程差序列元素下的总衰减量。计 算公式如下： Step 3: Calculate the center frequency series in the road traffic noise octave data and the road traffic noise attenuation under each sound path difference sequence element , to calculate the total attenuation under each sound path difference sequence element . Calculated as follows:
式中是中心频率序列的元素；为声速，取值为340m/s；是测量获得道路交通 噪声倍频程数据的中心频率对应的声压级；是测量获得道路交通噪声倍频程数据的总声 压级；是声音衰减后每个中心频率对应的声压级；是声音衰减后的总声压 级；是每个声程差序列元素下的总衰减量。 In the formula is the center frequency sequence Elements; is the speed of sound, the value is 340m/s; It is the sound pressure level corresponding to the center frequency of the road traffic noise octave data obtained by measurement; It is the total sound pressure level obtained by measuring the octave band data of road traffic noise; is the sound pressure level corresponding to each center frequency after sound attenuation; is the total sound pressure level after sound attenuation; is the total attenuation under each sound path difference sequence element.
步骤4：计算和的差值，并找出使该差值达到最小的频率值， 计算公式如下： Step 4: Calculate and and find the frequency value that minimizes the difference , Calculated as follows:
式中为声程差序列的元素个数；使差值达到最小的频率值即是等价频 率。 In the formula is the sound path difference sequence The number of elements; make the difference reach the minimum frequency value is the equivalent frequency .
步骤5：利用等价频率直接计算同种车型或车流在声屏障作用下的噪声衰减量。 Step 5: Utilize Equivalent Frequency Directly calculate the noise attenuation of the same type of vehicle or traffic flow under the action of the sound barrier.
以上所述的本发明的实施方式，并不构成对本发明保护范围的限定。任何在本发明的精神原则之内所作出的修改、等同替换和改进等，均应包含在本发明的权利要求保护范围之内。The embodiments of the present invention described above are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
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| CN109668960B (en) * | 2018-11-23 | 2020-09-29 | 中山大学 | Point sound source house group attenuation calculation method |
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