Modular bridge joints: reduction of noise emissions by use of Helmholtz Absorber
Modular bridge joints: reduction of noise emissions by use of Helmholtz Absorber
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模块化桥接头：通过使用亥姆霍兹吸振器减少噪音排放
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
S. Brown
中科院分区：
文献类型：
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作者：
E. Ancich;S. Brown
观察表明，噪声产生机制可能涉及桥梁结构和关节本身的两个部分，因为简单的轮胎撞击不太可能有足够的声功率来解释周围环境中噪声的持久性。在Georges River （Tom Ugly’s）大桥进行了工程测量，对这些测量结果的分析表明，模块化桥梁伸缩缝的振动与关节下方桥台空隙空间内产生的声学共振的相互作用导致了环境噪声的干扰。在采用亥姆霍兹吸收器安装之前，考虑或研究了许多工程降噪方法。“之前”和“之后”的噪声测量结果表明，由于安装了亥姆霍兹吸收器，低频噪声显著降低。在50到200赫兹的频率范围内，包括所有的自然振动模式，好处是最明显的。亥姆霍兹吸收器装置提供的降噪约为10 dBA，相当于感知响度的一半。
Observation suggested that the noise generation mechanism involved possibly both parts of the bridge structure and the joint itself as it was unlikely that there was sufficient acoustic power in the simple tyre impact to explain the persistence of the noise in the surrounding environment. Engineering measurements were undertaken at Georges River (Tom Ugly’s) Bridge and the analysis of these measurements indicated that an environmental noise nuisance resulted from the interaction of vibration of the modular bridge expansion joint with acoustic resonances produced within the void space of the abutment below the joint. A number of engineering methods of noise abatement were considered or investigated before a Helmholtz Absorber installation was adopted. “Before” and “After” noise measurement results show a significant decrease of low frequency noise due to the Helmholtz Absorber installation. The benefit is most obvious in the frequency range of 50 to 200 Hz which encompasses all the natural vibration modes. The noise reduction provided by the Helmholtz Absorber installation is of the order of 10 dBA which is equivalent to a halving of the perceived loudness.