厅堂侧向能量因子的仿真与实测

侧向能量因子是衡量厅堂空间感的重要客观指标之一。厅堂侧向能量因子通常采用计算机仿真的方法得到。首先采用MKH800电容型传声器在实际厅堂中开展侧向能量因子测试工作。然后，通过ODEON6.5建立厅堂三维仿真模型，计算相同位置处侧向能量因子的模拟值，并将实测值与模拟值进行对比分析。研究结果表明，各点位的仿真值均大于实测值，座席区前部偏差较小，正对舞台中后部区域偏差较大。造成偏差的主要原因是由于ODEON软件中扩散系数的设置与所在面特性无关，同时，软件无法分别定义各频段的扩散系数。因此，在实际工程项目中，为了准确地预测室内音质效果，建议普遍采用缩尺模型实验测量侧向能量因子。

Simulation and field measurement of the lateral energy fraction in hall

The lateral energy fraction in hall is an important objective factor of spatial impression, and it is usually simulated by computer simulation. We first used MKH800 to measure the lateral energy fractions at the corresponding positions of a real hall. Then, we established a 3D model of the hall with ODEON 6.5 to simulate the lateral energy fractions at the receiving points. Finally, the simulated lateral energy fractions were compared with the measured ones. The comparison results show that the simulation values are larger than the measured ones. The deviation of the simulated values is small in the front part of the seating area, and it is large in the middle and back part of the seating area in front of the stage. The reason for the deviation is that the diffusion coefficient of ODEON is not related to the areas'' character, and the diffusion coefficient of each frequency band can not be separately defined in this software. Therefore, in order to accurately predict the indoor acoustics, it is recommended to use architectural acoustic scale model to measure lateral energy fractions.