TY - GEN
T1 - Numerical simulation of close-proximity (CPX) tyre/road noise measurement trailer enclosure acoustics design
AU - Li, Dong Fang
AU - Leung, Randolph Chi Kin
AU - Chan, Horus Yui Ho
AU - Hung, Wing Tat
N1 - Funding Information:
The authors gratefully acknowledge the funding support from the Environment and Conservation Fund under project number 71/2015.
Publisher Copyright:
© Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.
PY - 2020/8/23
Y1 - 2020/8/23
N2 - The Close-Proximity (CPX) method is a standard methodology (ISO/CD 11819-2) for on-road measurement of tyre/road noise based on the PolyU Mark II Twin-wheeled CPX trailer developed for measurement in Hong Kong urban environment. Its acoustic enclosure is equipped primarily for shielding the contamination from external noise. It would be ideal to be anechoic so as to give a free field radiation condition for generated noise from running tyres; however, this condition is often damaged by multiple internal reflection inside enclosure. As such, a quality acoustic enclosure has to be designed and built to provide minimal background due to multiple reflections. Unfortunately current trial-and-error design practice for modifying enclosure construction for fine tuning of enclosure acoustic field is extremely time consuming and ineffective. This paper reports an alternative approach for designing quality CPX acoustic enclosure using three dimensional finite element method (FEM) simulation and its associated development of modeling of enclosure internal absorption material, source excitation, boundary conditions. The verification and validation of numerical approach by comparing the enclosure acoustics of an existing CPX trailer will be reported. The effort on a numerical parametric study of various conceptual CPX enclosure designs for the search of superior enclosure acoustic quality is then described and discussed.
AB - The Close-Proximity (CPX) method is a standard methodology (ISO/CD 11819-2) for on-road measurement of tyre/road noise based on the PolyU Mark II Twin-wheeled CPX trailer developed for measurement in Hong Kong urban environment. Its acoustic enclosure is equipped primarily for shielding the contamination from external noise. It would be ideal to be anechoic so as to give a free field radiation condition for generated noise from running tyres; however, this condition is often damaged by multiple internal reflection inside enclosure. As such, a quality acoustic enclosure has to be designed and built to provide minimal background due to multiple reflections. Unfortunately current trial-and-error design practice for modifying enclosure construction for fine tuning of enclosure acoustic field is extremely time consuming and ineffective. This paper reports an alternative approach for designing quality CPX acoustic enclosure using three dimensional finite element method (FEM) simulation and its associated development of modeling of enclosure internal absorption material, source excitation, boundary conditions. The verification and validation of numerical approach by comparing the enclosure acoustics of an existing CPX trailer will be reported. The effort on a numerical parametric study of various conceptual CPX enclosure designs for the search of superior enclosure acoustic quality is then described and discussed.
UR - http://www.scopus.com/inward/record.url?scp=85101389235&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85101389235
T3 - Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
SP - 4743
EP - 4758
BT - Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
A2 - Jeon, Jin Yong
PB - Korean Society of Noise and Vibration Engineering
T2 - 49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020
Y2 - 23 August 2020 through 26 August 2020
ER -