Development of edge-effect suppression barriers

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656340
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Architectural environment/equipment
• Research Institution: Kansai University
• Principal Investigator: KAWAI Yasuhito 関西大学, 環境都市工学部, 教授 (70121796)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 遮音壁 / エッジ効果 / 流れ抵抗 / 粒子速度 / 鏡像法 / 境界積分方程式

Outline of Final Research Achievements

In recent years, noise barriers have been widely used to reduce the impact of the noise caused by road and railway traffic. Alongside heavily-trafficked highways, in order to ensure the desired amount of noise attenuation, these noise barriers are often very high. High noise barriers, however, are not desirable due to their effect on the landscape and the cost of their installation. For this reason, many types of edge-modified noise barriers have been proposed to reduce the necessary height. In this research, an alternative noise barrier based on the "edge-effect" suppression technique is proposed, and the sound insulation performance is investigated both theoretically and experimentally. Numerical examples indicate that the diffracted sound is greatly attenuated by suppressing edge-effect using a thin absorbing material with a gradational distribution in impedance. This research result have already been widely commercialized.

Free Research Field

建築音響学