强吸收-强反射型听音室声场的有限元优化

为获得听音室预期的平直混响时间和合适的房间形状,提出了一种结合强吸收-强反射概念和有限元优化技术的设计方法,并进行了实验验证。对按照优化设计结果所搭建的听音室的房间频率响应、混响时间进行了实际测量,实测数据显示了与解析计算、数值模拟结果有着较好的吻合。在整个设计频段内混响时间特性曲线平直,优化后房间低频段两个倍频程内频率响应的标准偏差可降低约6dB。1/3倍频程中心频率上实测混响时间的方均根值和设计值的偏差在63至4 kHz的6个倍频程内仅为0.02 s。 

Optimized design for an anechoic-reverberant-type listening room

A method based on the combination of finite element method and Anechoic-Reverberant-Type theory is proposed for obtaining an expected listening room with a flat reverberant characteristic and a suitable shape.The industry practice was carried out and the measurement was taken.The predicted results matched well with the measured data.A 6 dB reduction of standard difference of frequency response was achieved after the room was optimized.A flat reverberation time characteristic was also obtained in the trail room.