办公楼屋顶空调机组的声屏障降噪方案研究

Design of the Sound Barrier for Reduction of Noise from Roof Top Air Conditioner Units of an Office Building

以某一置于屋顶对周围居民建筑产生影响的室外空调机组为例，利用CadnaA环境噪声预测软件，将声源模拟为体源，并利用现场测量值反推源强。通过精确的现场模拟并计算不同的屏障设置方案，给出推荐方案。工程实施后，根据现场测试，监测结果与设计较为符合。可见，在声源与预测点距离较近时，通过精确的现场建模，将声源模拟为体源，可避免将其作为点源计算时产生的较大误差。

The design procedure of sound harrier system which prevents the noise of outdoor air conditioner units from distur bing surrounding residential buildings is presented. CandnaA, the Environmental noise prediction software, is used. The noise source is modeled as a voluminous source. The source intensity is estimated from on-site measurements. The recommended plan is decided through accurate simulations of a variety of sound harrier schemes. The on-site tests of implemented system show that the actual performance is close to expectation. Obviously, to model the noise source as a voluminous source instead of a point source gave better results since the noise source is close to test points.