Estimation of error in motor‐vehicle noise‐level measurements

1974 ◽  
Vol 56 (6) ◽  
pp. 1801-1803
Author(s):  
John F. Hemdal
Keyword(s):  
Noise Level ◽  
Motor Vehicle ◽  
Vehicle Noise ◽  
Estimation Of Error

scholarly journals Assessment of acoustic pollution of areas bordering highways

2021 ◽  
Vol 937 (2) ◽  
pp. 022055
Author(s):  
E V Antonenko ◽  
A Yu Melnichuk ◽  
V V Popovich
Keyword(s):  
Traffic Flow ◽  
Noise Level ◽  
Motor Vehicle ◽  
Noise Source ◽  
Research Result ◽  
Maximum Level ◽  
Vehicle Noise ◽  
Acoustic Load ◽  
The Republic

Abstract The work is devoted to the peculiarities of acoustic pollution of roadside territories. The studied territory is characterized by uneven acoustic load on the experimental sections of the highways of the Republic of Crimea, which is associated with the peculiarities of traffic flow and technical characteristics of cars. The article considers the indicators of the equivalent and maximum levels of motor vehicle noise. As the research result, the excess of noise level from 10 to 30 dBA was revealed. The maximum level of acoustic pollution was recorded in 10-meter zone, at a distance of 30 m from the noise source the level of acoustic pollution is reduced to 5-10 dBA.

The influence of noise in vehicles on the driver’s subjective evaluation of driveability

2017 ◽  
Vol 232 (11) ◽  
pp. 1494-1500
Author(s):  
Hyoseong Wi ◽  
Jinil Park ◽  
Jonghwa Lee
Keyword(s):  
Fuel Economy ◽  
Noise Level ◽  
Subjective Evaluation ◽  
Engine Performance ◽  
Operating Conditions ◽  
Vehicle Noise ◽  
Noise Characteristics ◽  
Noise Frequency ◽  
Influence Of Noise ◽  
Physical Quantities

Driveability, including maneuverability, stability, and riding quality, is one of the most important factors determining the marketability of vehicles. However, unlike fuel economy or engine performance, driveability is very difficult to be evaluated quantitatively. With regard to research on vehicle noise related to driveability, existing works mainly deal with quantification or improvement methods. In this study, the various physical quantities regarding vehicle operating conditions were measured and the noise characteristics were manipulated in several ways to evaluate and analyze the influence of noise on subjective drivability. The results show that the noise level as well as noise frequency characteristics are influencing the drivers’ subjective evaluation of driveability.

Analysis of sound radiation from the coupling effect of vibrating noise and moving-vehicle noise on bridges

2005 ◽  
Vol 32 (5) ◽  
pp. 881-898 ◽  
Author(s):  
Yong-Seon Lee ◽  
Sang-Hyo Kim ◽  
Won-Suk Jang
Keyword(s):  
Dynamic Response ◽  
Noise Level ◽  
Acoustic Pressure ◽  
Sound Radiation ◽  
Element Model ◽  
Frequency Noise ◽  
Vehicle Noise ◽  
The Road ◽  
Vehicle Weight ◽  
Vibration Noise

An acoustic finite element model of a bridge is developed to evaluate the noise generated by the traffic-induced vibration of the bridge. The dynamic response of a multi-girder bridge, modeled by a three-dimensional (3-D) frame element model, is analyzed with a 3-axle (8 degrees of freedom (DOF)) truck model and a 5-axle (13 DOF) tractor-trailer. The flat plate element is used to analyze the acoustic pressure due to the fluid–structure interactions between the vibrating surface and contiguous acoustic fluid medium. The radiation fields of noise with a specified distribution of vibrating velocity and pressure on the structural surface are also computed using the Kirchhoff–Helmholtz integral. Among the diverse parameters affecting the dynamic response of a bridge, vehicle velocity, vehicle weight, and spatial distribution of the road surface roughness are found to be the main factors that increase the level of vibration noise. In an attempt to illustrate the influence of the structural vibration noise of a bridge to total noise level around the bridge, the random function is used to generate the vehicle noise source including the engine noise and the rolling noise between the road and tire. The results show that the low-frequency noise produced by the vibrating bridge members amplifies the high-frequency vehicle noise by 4–7 dB. In addition, the amplification rate of noise increases with traveling speed and vehicle weight. Key words: acoustic pressure on surface, sound radiation, noise level, Kirchhoff–Helmholtz integrals, dynamic response, vehicle noise model, sound pressure level.

scholarly journals Motor Vehicle Noise Assessment by Semireverberant Testing

1972 ◽  
Vol 51 (1A) ◽  
pp. 152-152
Author(s):  
K. D. Harford ◽  
T. E. Siddon
Keyword(s):  
Motor Vehicle ◽  
Vehicle Noise ◽  
Noise Assessment

Motor vehicle noise insulation

1987 ◽  
Vol 82 (5) ◽  
pp. 1860-1860
Author(s):  
H. Gahlau
Keyword(s):  
Motor Vehicle ◽  
Vehicle Noise
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