Engineering Seminar Series: Energy-friendly broadband compact duct silencing device and the related aeroacoustics
The Faculty of Science and Engineering, Engineering Department presents:
Energy-friendly broadband compact duct silencing device and the related aeroacoustics, Prof. Shiu Keung Tang
Staff and students are invited to hear from our lecturer in Electrical and Electronic Engineering, Prof. Shiu Keung Tang.
The air conditioning and ventilation system is the major source of noise in a modernized building. Silencers are required to attenuate the noise before it reaches the occupied building interior. Conventional dissipiative silencers are strong flow resistances and much energy is wasted. Energy-friendly broadband compact flow duct silencers are thus in urgent need. Expansion chambers could result in much less pressure drop but its sound attenuation capacity is capped by the cross sectional area expansion ratio. A recent study shows that the acoustical performance of such chamber can be largely enhanced by simply offset the cavities which form the expansion chamber. The performance of this new ‘offset’ chamber is reduced when the duct flow speed exceeds a threshold. Some preliminary experimental results illustrate that there could be a new similitude specific to this aeroacoustical problem, such that the frequency range of attenuation and the threshold flow speed can be related to the dimensions of the device. Methods to enhance the performance of the device are to be explored.
We hope that you can come along and show your support!
Registration is not necessary, please do turn up if you have some free time!