• Title/Summary/Keyword: 타이어소음

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Reduction of Air-pumping Noise based on a Genetic Algorithm (유전자 알고리즘을 이용한 타이어 공력소음의 저감)

  • Kim, Eui-Youl;Hwang, Sung-Wook;Kim, Byung-Hyun;Lee, Sang-Kwon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.1
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    • pp.61-73
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    • 2012

  • The paper presents the novel approach to solve some problems occurred in application of the genetic algorithm to the determination of the optimal tire pattern sequence in order to reduce the tire air-pumping noise which is generated by the repeated compression and expansion of the air cavity between tire pattern and road surface. The genetic algorithm has been used to find the optimal tire pattern sequence having a low level of tire air-pumping noise using the image based air-pumping model. In the genetic algorithm used in the previous researches, there are some problems in the encoding structure and the selection of objective function. The paper proposed single encoding element with five integers, divergent objective function based on evolutionary process and the optimal evolutionary rate based on Shannon entropy to solve the problems. The results of the proposed genetic algorithm with evolutionary process are compared with those of the randomized algorithm without evolutionary process on the two-dimensional normal distribution. It is confirmed that the genetic algorithm is more effective to reduce the peak value of the predicted tire air-pumping noise and the consistency and cohesion of the obtained simulation results are also improved in terms of probability.

  • https://doi.org/10.5050/KSNVE.2012.22.1.061 인용 PDF KSCI

CFD/Kirchhoff Integral Method for the Prediction of the Air-Pumping Noise by a Car Tyre (CFD/Kirchhoff 적분 방법을 이용한 자동차 타이어의 Air-Pumping 소음 예측)

  • Kim, Sung-Tae;Lee, Soo-Gab
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.916-919
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    • 2004

  • The monopole theory has long been used to model air-pumped effect from the elastic cavities in car tire. This approach models the change of an air as a piston moving backward and forward on a spring and equates local air movements exactly with the volume changes of the system. Thus, the monopole theory has a restricted domain of applicability due to the usual assumption of a small amplitude acoustic wave equation and acoustic monopole theory. This paper describes an approach to predict the air-pumping noise of a car ave with CFD/Kirchhoff integral method. The type groove is simply modeled as piston-cavity-sliding door geometry and with the aid of CFD technique flow properties in the groove of rolling car tyre are acquired. And these unsteady flow data are used as a air-pumping source in the next Cm calculation of full tyre-road geometry. Acoustic far field is predicted from Kirchhoff integral method by using unsteady flow data in space and time, which is provided by the CFD calculation of full tyre-road domain. This approach can cover the non-linearity of acoustic monopole theory with the aid of using Non-linear governing equation in CFD calculation. The method proposed in this paper is applied to the prediction of air-pumping noise of modeled car tyre and the predicted results are qualitatively compared with the experimental data.

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A Effect Analysis on Noise Reduction by Distance about General Noise and Noise Applied ANC (일반 소음과 ANC 적용 시 소음에 대한 거리별 소음 감쇄효과 분석)

  • Moon, Hak-Ryong;Lim, You-Jin;Kang, Won-Pyoung
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1046-1047
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    • 2015

  • 기존에 시행 중인 도로교통 소음을 저감시키기 위한 방안인 방음벽과 저소음 포장은 보편적으로 사용되어 오고 있으나, 몇 가지 단점을 가지고 있다. 방음벽은 높은 시공으로 인한 도시 경관 저하, 과도한 시공비 및 유지비, 조류가 방음벽에 부딪혀 유발되는 생태계 교란 현상 등 여러 문제점을 가지고 있다. 또한, 저소음 배수성 포장은 타이어와 도로 포장간의 마찰 소음을 원천적으로 저감시키는 효율적인 공법이나, 시공 후 일정기간이 지나면 공극이 막혀 성능이 저하되어 유지 보수가 적절하게 필요한 단점이 있다. 수음점의 거리별 소음예측을 통하여 일반적인 원소음과 능동형 소음 저감 기술(ANC) 적용 후의 효과를 알아보고, 소음원의 제어 및 영향거리에 따른 저감 목표를 예측하고자 한다.

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Correlation between Proximity Noise Measurement Method (CPX) and Roadside Measurement Method (SPB) for Road Traffic Noise (도로교통소음에 대한 근접소음 측정법(CPX)과 통과소음 측정법(SPB)의 상관관계)

  • Yoo, In-Kyoon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.12
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    • pp.310-319
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    • 2020

  • Korea estimates the traffic noise by measuring the total traffic noise when the traffic passes (SPB; Statistical Pass-By). Another method (CPX; Close Proximity) directly measures the tire/road noise by installing a microphone near the tire. The CPX method is not a formal test method in Korea. There has been little research between CPX and SPB. This study proposes a method for estimating SPB, using the CPX, which is easy to measure. This study used the results of a large-scale test conducted by Korea Expressway Corporation (KEC) and a research paper on CPX in this section. The results by the KEC showed that the low noise pavement has a noise reduction of 10.4dB. In CPX research, the noise reduction was 10.7dB and was similar to 10.4dB in SPB. This study shows why the noise reduction is the same regardless of the position, the reason that the amount of noise reduction is similar, the difference of the noise according to the position of the microphone using the concept of noise summation and distance reduction. This study shows that including the CPX as a variable in the traffic noise prediction program is very important to improve noise prediction reliability.

  • https://doi.org/10.5762/KAIS.2020.21.12.310 인용 PDF KSCI