A Trial Acoustic Improvement in a Lecture Hall with MPP Sound Absorbers and FDTD Acoustic Simulations

Sound absorbing micro-perforated panels (MPPs) are being increasingly used because of their high quality in terms hygiene, sustainability and durability. The present work investigates the feasibility performance MPPs when as an acoustic treatment lecture rooms. With this purpose, three different steel specimens were first designed following existing predictive models then physically manufactured through 3D additive metal printing. specimens’ behavior was analyzed with experimental measurements single-layer double-layer configurations. Then, investigation focused on application to ceiling university hall enhance speech intelligibility. Numerical simulations carried out using a full-spectrum wave-based method: finite-difference time-domain (FDTD) code chosen better handle time-dependent signals verbal communication. proposes workflow explore suitability specific material requirements. measured impedance complex values allowed derive input data referred FDTD simulations. outcomes process show influence reverberation time (T30) sound clarity (C50). A systematic comparison standard geometrical (GA) technique is reported well.