Measured light vehicle noise reduction by hedges

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• 作者：Timothy Van Renterghem ; Keith Attenborough ; Manuel Maennel ; Jerome Defrance ; Kirill Horoshenkov ; Jian Kang ; Imran Bashir ; Shahram Taherzadeh ; Beate Altreuther ; Amir Khan ; Yuliya Smyrnova ; Hong-Seok Yang
• 关键词：Road traffic noise ; Vegetation ; Outdoor sound propagation
• 刊名：Applied Acoustics
• 出版年：April, 2014
• 年：2014
• 卷：78
• 期：Complete
• 页码：19-27
• 全文大小：3079 K

文摘

The acoustical effects of hedges result from a combination of physical noise reduction and their influences on perception. This study investigates the physical noise reduction so as to enable estimation of its relative importance. Different in-situ methods have been used to measure noise shielding by hedges. These include a statistical pass-by experiment where the real insertion loss of a hedge could be measured, three controlled pass-by experiments using a reference microphone at close distance, and transmission loss measurements using a point source. Thick dense hedges are found to provide only a small total A-weighted light vehicle noise reduction at low speeds. Measured insertion losses range from 1.1 dBA to 3.6 dBA. The higher noise reductions are found to be associated with an increased ground effect.