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International Journal of Environmental Research
University of Tehran
ISSN: 1735-6865 EISSN: 1735-6865
Vol. 3, No. 3, 2009, pp. 327-334
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Bioline Code: er09035
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environmental Research, Vol. 3, No. 3, 2009, pp. 327-334
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Optimization of Profiled Diffuser Barrier Using the New Multiimpedance Discontinuities Model
Monazzam, M.R.
Abstract
The paper describes an investigation about the application of the new multipleimpedance
discontinuities model for optimizing profile diffuser barriers. The new multiple-impedance
discontinuities model is much faster than the numerical method, thus it is used in an optimization
process. The A-weighted insertion loss was used for the traffic noise spectrum.The result of
optimization, which is done by simplex downhill method, showed that the chosen method combined
with the appropriate cost function is both a fast and effective way to optimize a diffusive profiled
barrier, improving the performance of the barrier in the whole frequency bandwidth of the reactive
profiled barriers. The optimized barrier improves the A-weighted insertion loss of all different tested
barriers including absorbent, quadratic residue sequence and random sequence barriers.The
introduced optimization process in this investigation is fast, clear and flexible so that any different
ribbed surfaces and dimensions utilized on any different T-profile barriers can be optimized. The
parameter used to optimize is just simply the well depth sequence, which is easy to realize and
practical to design.
Keywords
Profiled noise barrier, Diffusion, Optimization, Multiple-impedance discontinuities, Quadratic residue diffuser
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© Copyright 2009 - Graduate Faculty of Environment University of Tehran Alternative site location: http://ijer.ut.ac.ir/
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