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http://dx.doi.org/10.7855/IJHE.2013.15.4.031

A Study of Eliminating the Vehicle Noise of Engine RPM from the Friction Noise between Tire and Road Pavement by Using a NCPX Method  

Han, Bong-Koo (서울과학기술대학교 건설시스템디자인공학부)
Kim, Do Wan (서울과학기술대학교 건설시스템디자인공학부)
Mun, Sungho (서울과학기술대학교 건설시스템디자인공학부)
Kim, Ha-Yeon (서울과학기술대학교 건설시스템디자인공학부)
Publication Information
International Journal of Highway Engineering / v.15, no.4, 2013 , pp. 31-42 More about this Journal
Abstract
PURPOSES : The purpose of this study is to eliminate the noise of the vehicle after measuring the friction noise obtained from the NCPX (Noble Close ProXimity) method. The pure friction noise between the tire and road pavement could be determined from filtering the compositeness of sound and the influence of the vehicle noise. METHODS: The noise magnitude could be determined by analyzing the sound pressure level (SPL) and sound power level (PWL) along with the noise frequency of a FFT (Fast Fourier Transform) analysis as well as CPB (Constant Percentage Bandwidth) analysis. RESULTS: When the test for measuring the friction noise originated somewhere between tire and road pavement is performed with NCPX method, it must be fulfilled by attaching the surface microphone near the tire. In this condition, the surface microphone can measure the friction noise occurred at between tire and pavement, the chassis noise from the engine and power transfer units, the fluctuating aerodynamic noise, and the turbulence noise directly affected to the surface microphone. By using the NCPX method, the noise occurred at the vehicle must be eliminated for measuring the friction noise between tire and pavement from the traffic noise. CONCLUSIONS: The vehicle's testing engine noise depends on the vehicle and road types. The effect of vehicle's engine noise is less than the friction noise occurred at between tire and pavement at less than 1% effect.
Keywords
FFT (Fast Fourier Transform) analysis; CPB (Constant Percentage Bandwidth) analysis; NCPX (Noble Close ProXimity) method; PWL(sound PoWer Level); SPL (Sound Pressure Level); correlation analysis; regression analysis; Two-Way ANOVA (ANalysis Of VAriance);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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