Research and optimization of acoustic environment in ordinary classrooms of middle school

¹ Wenzhou Industrial Design Institute Co., Ltd. Zhejiang Wenzhou 325000
² Wenzhou Design Group Co., Ltd. Zhejiang Wenzhou 325000
³ College of Civil Engineering, Xiangtan University, Xiangtan 411105,

^* Corresponding author: sunhf1212@xtu.edu.cn

Abstract

A good classroom acoustic environment will contribute to teachers’ health and students’ learning. Comfortable acoustic environment requires suitable reverberation time, sufficient loudness, uniform sound field distribution, high language clarity, and no acoustic defects such as echo and acoustic focusing. In this study, the optimization strategy of acoustic environment is proposed through the investigation, field testing and numerical simulation analysis of a middle school classroom in Wenzhou under different ventilation conditions. The results show: the key factors affecting the classroom acoustic environment are outdoor activity noise, corridor noise, and classroom teacher-student activity noise. Through optimization, the quality of classroom acoustic environment is improved significantly. Classroom reverberation time (intermediate frequency) decreased from 1.5s to 0.7s; ALC decreased from 9.65% to 4.75%; STI increased from 0.534 to 0.664. The research results provided reference for acoustic design of secondary school classrooms in the future.