Closed-form analytical approach for calculating noise contours of directive aircraft noise sources
Closed-form analytical approach for calculating noise contours of directive aircraft noise sources
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用于计算定向飞机噪声源噪声轮廓的闭式分析方法
DOI：
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Antonio J. Torija Martinez
中科院分区：
文献类型：
--
作者：
Daniel C. Amargianitakis;R. Self;Athanasios P. Synodinos;A. Proença;Antonio J. Torija Martinez
本文扩展了简化的机场噪声模型快速航空噪声评估器（RANE）[Torija等人，Journal of the Acoustical Society of America，第141卷，第2期，2017年，第981-995页]，增加了包括完全非各向同性噪声源的能力。该扩展工具RANE v2是作为新型飞机多学科声学评估的一部分开发的，目的是生成机场和直升机停机坪周围的地面轮廓。版本2扩展了RANE的能力，以适应未来的飞行器实施推进系统解决方案与固有的方向性的预测。该模型使用三维噪声发射表面周围的一系列离散段，代表飞机的飞行路径。主要的输入是声源的声功率级、距飞行路径的距离以及声源的三维方向性。方向性函数可以采用分析或数值形式，允许实验数据输入。本文演示了使用球谐函数作为一种形式的方向性函数与封闭形式的解析解计算噪声暴露的轮廓。结果和比较对联邦航空管理局的航空环境设计工具模块的直升机社区噪声表明，暴露轮廓坐标可以估计高和低的噪声暴露水平。通过假设单个源的方向性，并由此假设复杂的噪声面，将源的方向性纳入进来，可以评估横向衰减、发动机安装效应和过渡操作（垂直飞行到水平飞行，反之亦然）。由于模型的分析性质，低计算要求允许快速探索设计空间和参数研究，输入要求最低。通过预测三架直升机的噪声足迹证明了RANE v2的能力，每架直升机的尺寸、性能和方向性特性都不同。
This paper extends the simplified airport noise model Rapid Aviation Noise Evaluator (RANE) [Torija et al., Journal of the Acoustical Society of America, Vol. 141, No. 2, 2017, pp. 981–995], adding capability of including fully nonisotropic noise sources. This extended tool, RANE v2, is developed as a part of multidisciplinary acoustic assessment of novel aircraft, in order to produce ground contours around airports and helipads. Version 2 extends the capability of RANE to accommodate predictions of future air vehicles implementing propulsion systems solution with inherent directional properties. The model uses three-dimensional noise emission surfaces around a series of discretized segments that represent the aircraft flightpath. The main inputs are the sources’ sound power level, the distance from the flightpath at which a level is observed, and the source three-dimensional directivity. The directivity function may take analytical or numerical form, allowing for experimental data inputs. This paper demonstrates the use of spherical harmonics as a form of directivity function with a closed-form analytical solution for calculating the noise exposure contours. Results and comparison against the Federal Aviation Administration’s Aviation Environmental Design Tool module for helicopter community noise indicate that exposure contour coordinates can be estimated for high and low noise exposure levels. The incorporation of source directivity allows for the assessment of lateral attenuation, engine installation effects, and transition operations (for vertical to horizontal flight and vice versa) via the assumption of individual source directivities and, therefore, complex noise surfaces. As a consequence of the analytical nature of the model, low computational requirements allow for fast exploration of the design space and parametric studies, with minimal input requirements. The capabilities of RANE v2 are demonstrated by predicting noise footprints for three helicopters, each of different size, performance, and directivity characteristics.
DOI：
10.1121/1.4976053
发表时间：
2017
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
Torija AJ
通讯作者：
Torija AJ
用于航空战略环境影响评估的机场噪声建模
影响因子：
3.4
作者：
Torija A
通讯作者：
Torija A