|Title:||Analysis and design of high noise insulation windows|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Windows -- Acoustic properties.
|Department:||Department of Mechanical Engineering|
|Pages:||x, 79 pages : color illustrations|
|Abstract:||This work systematically investigates the feasibility of applying transparent, micro-perforated panel absorbers (MPPAs) into window systems for traffic noise attenuation (1000-1500Hz), and establishes a generalized design strategy for optimizing MPPAs for window system noise control. Ageneral theoretical model was first established which predicts the acoustic performance of the micro-perforated panel with a regular backing cavity for normal incidence. The parameters of the panel were then varied and the respective sound absorption coefficients obtained and compared to identify MPPA acoustic performance variation trends. Simulations demonstrated MPPA control performance in a window structure within the frequency band of interest. MPPA parameters were optimized to improve the sound attenuation performance of a simulated window system based on the variation trends mentioned above; the average sound pressure level difference was considered the objective index for optimization. As validation, an experimental model was built and the experiment was conducted in a full anechoic chamber to demonstrate the effectiveness of transparent MPPA application for sound attenuation in window systems, sound attenuation performance of window system with different backing cavities were compared for optimization. Ventilation performance was likewise favorable, as evidenced by a simple experiment run to compare air flow velocities at the inlet and outlet of a test window system.|
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