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Active local control of propeller-aircraft run-up noise

机译：主动控制螺旋桨-飞机起步噪声

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摘要

Engine run-ups are part of the regular maintenance schedule at airports. The noise generated by the run-ups propagates into neighbouring communities, disturbing the residents. Active noise control is a potentially cost-effective alternative to passive methods, such as enclosures. Propeller aircraft generate low-frequency tonal noise that is highly compatible with active control. This paper presents a preliminary investigation of the feasibility and effectiveness of controlling run up noise from propeller aircraft using local active control. Computer simulations for different configurations of multi-channel active-noise-control systems, aimed at reducing run-up noise in adjacent residential areas using a local-control strategy, were performed. The variations of the attenuation and amplification zones with the number of control channels, and with the source/control-system geometry, were studied. The aircraft was modeled using one or two sources, with monopole or multipote radiation patters. Both free-field and half-space conditions were considered, for the configurations studied, results were similar in the two cases. In both cases, large triangular quiet zones, with local attenuations of 10 dB or more, were obtained when nine or more control channels were used. Increases of noise were predicted outside of these areas, but these were minimized as more control channels were employed. By combining predicted attenuations with measured noise spectra, noise levels after implementation of an active control system were estimated.
机译：发动机启动是机场常规维护计划的一部分。助跑器产生的噪音传播到附近社区，打扰了居民。主动噪声控制是无源方法（例如外壳）的一种潜在的经济有效替代方法。螺旋桨飞机会产生与主动控制高度兼容的低频音调噪声。本文对使用局部主动控制来控制螺旋桨飞机的助跑噪声的可行性和有效性进行了初步研究。针对不同通道的多通道有源噪声控制系统进行了计算机模拟，旨在使用本地控制策略减少相邻居民区的启动噪声。研究了衰减和放大区域随控制通道数量以及源/控制系统几何形状的变化。该飞机使用一个或两个辐射源，单极或多点辐射图进行了建模。考虑了自由场和半空间条件，对于所研究的配置，两种情况下的结果相似。在这两种情况下，当使用九个或更多控制通道时，均会获得局部衰减为10 dB或更大的大三角形静区。预计在这些区域之外会增加噪声，但随着使用更多控制通道，这些噪声会最小化。通过将预测的衰减与测得的噪声频谱结合起来，可以估算出实施主动控制系统后的噪声水平。

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