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Method for determining noise equivalent frequency of motor vehicle

A technology of equivalent frequency and measurement method, which is applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as the diffraction attenuation of sound barriers that cannot accurately reflect traffic noise, and the inability to reflect the frequency characteristics of vehicle noise, etc.

Inactive Publication Date: 2012-10-24
SUN YAT SEN UNIV
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Problems solved by technology

[0005] However, with the development of the economy, the specifications and speed of motor vehicles have changed greatly. The equivalent frequency of 500 Hz can no longer accurately reflect the diffraction attenuation of the sound barrier of traffic noise, and the use of a single equivalent frequency cannot reflect Noise frequency characteristics of various types of vehicles at different speeds

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  • Method for determining noise equivalent frequency of motor vehicle

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Embodiment Construction

[0017] The invention will be further described below according to the embodiments:

[0018] According to the relevant provisions of "External Noise Limits and Measurement Methods of Accelerated Automobiles GB1495-2002", in order to avoid the interference of unnecessary factors, the selected sampling sections should be far away from intersections, rivers and densely populated areas. The object of sampling and detection is the noise spectrum of a single vehicle, and noise interference between vehicles should be excluded. There should be no other driving vehicles within a distance of 50 meters before and after the vehicle to be sampled and detected.

[0019] The sampling point is 7.5 meters away from the center line of the first lane, and 1.2 meters above the ground. When the driving vehicle is closest to the sampling point, use a sound level meter to record the 1 / 3 octave sound pressure level at that time, and record the vehicle type , and measure the speed of the vehicle using ...

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Abstract

The invention provides a method for determining the noise equivalent frequency of a motor vehicle, which is suitable for different travel speeds and different vehicle types, has simple calculation and high precision, and is used for accurately calculating the insertion loss of a sound barrier. The method for determining the noise equivalent frequency of the motor vehicle comprises the following steps of: step 1, acquiring the noise sample data of the vehicle, including 1 / 3 octave sound pressure level of a single vehicle, the vehicle type and the travel speed; step 2, using a method of Appendix B of Norm on Acoustical Design and Measurement of Noise Barriers to calculate the noise equivalent frequency; and step 3, analyzing a great number of sample data in a statistical manner according to different vehicle type intervals and different travel speed intervals, and determining the noise equivalent frequency which has the maximum probability of occurrence.

Description

technical field [0001] The invention belongs to the technical field of road traffic and environmental protection, in particular to the measurement of motor vehicle noise. Background technique [0002] With the continuous advancement of my country's urbanization process, the problem of urban noise pollution has become increasingly prominent, seriously endangering people's normal life and work, and has aroused widespread concern. According to the statistics of the National Bureau of Statistics in 2009, traffic noise, industrial noise, construction noise and social life noise in major cities in my country accounted for 38.6%, 19.6%, 25.7% and 16.1% of the sound energy of all noise, respectively. It can be seen that traffic noise is the main component of urban environmental noise, how to effectively prevent and control traffic noise is of great significance to improve urban environmental noise. [0003] Setting up sound barriers is one of the important means to prevent and cont...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 蔡铭罗鹏林郁山余志
Owner SUN YAT SEN UNIV
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