轻轨交通新型声屏障技术

实验分析了轻轨交通噪声的频率特性。针对现有声屏障的优缺点，开发研制了两种阻抗复合型声屏障，在轻轨交通噪声的主要频率范围内，该声屏障的吸声性能较出色，且有能够防止雨尘侵害的优点。为分析新声屏障的斜入射吸声系数，提出了一种多通道脉冲响应方法，该方法排除了被测对象的反射与散射指向性影响，适合测量不平整吸声辊面的斜入射吸声系数，新声屏障的测量实验证明了该方法的有效性。

Novel Barrier for Lightweight Railway Traffic Noise

Based on the investigation of characteristics of lightweight railway traffic noise and current barriers, a new kind of barriers for railway traffic noise was designed, which combines the advantages of absorption material and resonance absorbers. The absorption performance of the novel berriers on the dominant frequencies of lightweight railway noise are satisfactory. With the help of the distinct structure, the new barriers can prevent from the damage of rain and dust. The ordinary impulse response methods are unable to be applied for analyzing the absorption of unsmoothed surface. A multi channel impulse response method was presented to study the absorption coefficient at oblique incidence of the new barriers with triangle absorption units. The orientation effect of reflection and scattering can be eliminated by this new experiment technique. The experiment of the new barrier shows the efficacy of the proposed multi channel impulse response method.