|Title:||An attempt to predict noise barrier performance using computational aeroacoustic method|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Noise barriers -- Design and construction -- Data processing.
Noise control -- Mathematical models
|Department:||Department of Mechanical Engineering|
|Pages:||viii, 68 leaves : ill. (some col.), col. map ; 30 cm.|
|Abstract:||This thesis is focus on attempting to use a new computational aeroacoustic method to predict the noise barrier performance. The new computational aeroacoustic method is based on conservation element and solution element (CE/SE) method, which has a unified treatment of space and time. It provides a robust computational aeroacoustic tool with low dissipation and dispersion errors to ensure the flow modeling equations can be done at a high accuracy; hence the difficulties and error level in the later optimal noise control process can be reduced. One barrier case was simulated firstly to validate this method. The comparison of the different time propagation of the same wavelength λ, and the different λ propagation of the same time were shown separately. The simulated insertion loss of one barrier was conducted and plotted against frequency. The simulation agrees reasonably well with both the MacDonald solution and the Hadden and Pierce formula in the frequency range of interest. This illustrates the computational aeroacoustic method is feasible and effective for noise barrier performance simulation. Then another two cases were conducted by the method. They are two barriers and two barriers with rooms. The results shows the comparison propagation status at the same time or at the same λ|
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