INTEGRATED PASSIVE AND ACTIVE CONTROL OF HUMMING NOISE FROM KCGM’S HAUL TRUCKS

该项目旨在解决Kalgoorlie Consolidated Gold Mines运输卡车在Kalgoorlie， Boulder和Williamstown地区的嗡嗡声所造成的环境噪音问题。该解决方案利用集成的被动和主动控制系统来减弱卡车排气和发动机嗡嗡声的频率成分。该技术的一个新方面是使用被动式微穿孔结构来提供必要的吸声能力，改变卡车排气和发动机的声传播和辐射特性，并提高主动控制的有效性。

This project aims to resolve an environmental noise issue caused by the humming noise of Kalgoorlie Consolidated Gold Mines haul trucks in the areas of Kalgoorlie, Boulder, and Williamstown. This solution utilises integrated passive and active control systems to attenuate the frequency components of humming noise from a truck’s exhaust and engine. A novel aspect of this technique is the use of passive micro-perforated structures to provide the necessary sound absorption capability and to alter the sound propagation and radiation properties of the truck exhaust and engine, and increase the effectiveness of active control.