Tyre/road interaction noise is one of the major contributors to the overall traffic noise when vehicles are travelling at high speeds in free flow traffic. The Close-Proximity (CPX) method is a standard method (ISO/CD 11819-2) for on-road measurement of tyre/road noise. Based on the methodology of this standard, the PolyU Mark II Twin-wheeled CPX trailer was developed and has been the major facility for measurement of tyre/road noise 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 for generated noise from running tyres; however, this radiation condition is often influenced by multiple internal reflection inside enclosure. As such, better CPX trailer acoustics is required for more accurate and faithful measurement of tyre/road noise. The fine tuning of CPX enclosure acoustic field design is very time consuming and ineffective. This seminar reports an approach for designing CPX trailer acoustic quality by means of numerical simulation. The verification and validation of numerical approach with acoustics of existing PolyU Mark II trailer is reported. A numerical parametric study of various conceptual CPX enclosure designs is discussed. Road testing results with optimal acoustic quality design (Mark III) on selected Hong Kong roads will be presented.

Mr. Dong Fang LI 

PhD student at Department of Mechanical Engineering of The Hong Kong Polytechnic University

Dr Randolph Chi Kin LEUNG 

Associate professor in the Department of Mechanical Engineering of The Hong Kong Polytechnic University

Dr Wing Tat HUNG 

Former associate professor in the Department of Civil and Environment Engineering

English
Registration & Enquiries 

This seminar is free of charge and prior registration is required. Applications will be accepted on a first-come-first-served basis with priority given to members of MMNC Division. Only on-line registration via https://forms.gle/4AstuyksXuPgfC2aA shall be accepted for registration. Successful applicants will be notified individually. Attendance certificates will be issued after the event. For enquiries, please contact Dr Randolph C. K. LEUNG at email: mmrleung@polyu.edu.hk.