News and Events


2012 年 02 月 07 日
Seminar - Progress in Research on Natural Ventilation ANC Windows by Prof Xiaojun Qiu

Date:   7 February 2012 (Tuesday)

Time:   3:00 pm – 4:00 pm

Venue:  EF305, The Hong Kong Polytechnic University

One weakness of natural ventilation windows is their low sound insulation capacity, especially in the low frequency range, which can be improved by using Active Noise Control (ANC) techniques. This presentaion reports recent progresses in research on natural ventilation ANC windows at Nanjing University. First, an analytical model based on the modal expansion method is described, which can be used to calculate the low frequency sound transmission through the staggered window system into a room and to be used to study the feasibility of applying ANC on such a window system numerically. Then, experimental results carried out with a 1:2 scale model in an anechoic chamber are reported. A design of a practical prototype is also introduced and their onsite measured performance is given. Finally, several issues on practical implementations of such natural ventilation ANC windows are discussed.

Xiaojun Qiu graduated in electronics from Peking University, China, in 1989 and received his Ph.D. degree from Nanjing University, China, in 1995 for a dissertation on active noise control. He worked in the University of Adelaide, Australia, as a Research Fellow from 1997 to 2002. He has been working in the Institute of Acoustics, Nanjing University, as a professor on Acoustics and Signal processing since 2002 and now is the head of the Institute. He visited Germany as a Humboldt Research Fellow in 2008. His main research areas include noise and vibration control, room acoustics, electro-acoustics and audio signal processing. He is a member of Audio Engineering Society and International Institute of Acoustics and Vibration.  He has authored and co-authored more than 200 technique papers and held more than 60 patents on audio acoustics and audio signal processing.