Browsing by Author "Allam, S"

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    A comparative analysis of the tool-based versus material-based fabrication pedagogy in the context of digital craft
    (The Association for Computer-Aided Architectural Design Research in Asia (CAADRIA), 2021-04) Allam, S; Alaçam, S
    This study presents the comparative analysis of two undergraduate courses which focus on introducing digital fabrication to design students. The duration of the compared courses are 5 weeks and 7 weeks respectively. The study employs action research methodology, while the theoretical lectures, weekly exercises, materials, fabrication tools and techniques, and students' outcomes were used as data sources. Particularly the material-based pedagogy and tool-based pedagogy of the compared courses are evaluated in relation with the tools, materials and techniques. The outcomes of the study is expected to provide insights for instructors and design students in the context of digital craft. © 2021 and published by the Association for Computer-Aided Architectural Design Research in Asia (CAADRIA), Hong Kong
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    SHAPE OPTIMIZATION OF COMPLEX MULTI-CHAMBER MUFFLER
    (NT INST ACOUSTICS & VIBRATION, 2010) Allam, S
    A complex multi-chamber muffler is the most common noise control filter used for automotive exhaust systems. It is important when searching for an efficient acoustical mechanism to have an optimally shaped muffler designed especially for the constrained space found in today's vehicles. The research work of optimally shaped of multi-chamber perforated ducts is rarely addressed; so this paper will not only analyze the sound transmission loss (TL) of complex multi-chamber perforated muffler but also will analyze the optimal design shape within a limited space. The four-pole system matrix that is used in evaluating acoustic performance is derived by using the decoupled numerical method. Moreover, a simulated annealing (SA) algorithm, a robust scheme in searching for the global optimum by imitating the softening process of metal, has been adopted during shape optimization. To assure SA's correctness, the TL maximization of multi-chamber perforated mufflers at a targeted frequency of 1000 Hz is tested first. The result of the optimized muffler is compared with the measured results at room temperature. Furthermore, a numerical case in dealing with a broadband noise emitted from an I.C. Engine by using complex multi-chamber perforated mufflers has been introduced and fully discussed.