Applicability of multi-objective optimization in classroom acoustics design using analytical and geometrical acoustic models

The purpose of this study is to improve the acoustic quality of classrooms for a better teaching-learning process by the development of a routine which aids in the optimization of typology, extension and position of acoustic materials. It is a tool addressed to architects, building designers and professionals alike that are involved in the planning, construction and renovation of rooms. One classroom in Turin has been selected for this study and a basic geometric model has been built in Grasshopper, that serves as the environment for parametric investigation and improvement of acoustics parameters. Reverberation time and STI, which are considered as the most important descriptors in classroom acoustics have been determined using theoretical calculations (Sabine, Eyring and Barron&Lee theories) and geometrical acoustic (GA) simulations (Pachyderm). The latter allows to take into account the scattering properties of surfaces and different combinations of all the acoustic materials Finally, Octopus has been used to perform multi‐objective optimization runs considering as objectives the acoustic parameters and the acoustic design/renovation costs. The algorithm has been developed in order to allow to choose different optimization sets depending on the material or the type of acoustic treatment to optimize. Said model provides, essential information on the acoustic quality of the classroom and recommendations on how to increase it by improving teaching-learning activities; which would normally be time-consuming. The results show that the GA simulations and theoretical calculations are compatible for the solutions without scattering properties. However, it needs further development in order to extend its application field in fact right now operating on the Grasshopper canvas would require significant knowledge on the designer?s behalf concerning parametric design and acoustics.