High noise levels in a multi-noise plant can be harmful to workers and will not only lead to psychological but also to physiological ailments. Consequently, noise control of industrial equipment becomes vital for workers. The study focuses on shape optimization of space-constrained close-fitting acoustic hoods. In this paper, a sound insertion loss used for evaluating the acoustic performance of an acoustical hood will be adopted. Numerical assessments of case studies for depressing the broadband noise emitted from motor-driven equipment by optimally designing a shaped one-layer close-fitting acoustic hood within a space constrained situation will be introduced. Additionally, simulated annealing (SA), a robust scheme used to search for the global optimum of a one-layer close-fitting acoustic hood by imitating the metal’s heating process, was used during the optimization process. Before dealing with a broadband noise, the maximization of sound insertion loss (IL) with respect to a one-tone noise was introduced for a reliability check on the SA method. Also, an accuracy check on the mathematical model was performed. This paper, by using a simulated annealing method, presents an optimally designed one-layer close-fitting acoustic hood to provide a quick and effective method to reduce the noise level of the equipment.

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