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Prediction of Helicopter Rotor Discrete Frequency Noise: A Computer Program Incorporating Realistic Blade Motions and Advanced Acoustic Formulation.

机译：直升机旋翼离散频率噪声的预测：结合实际叶片运动和先进声学公式的计算机程序。

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A computer program has been developed at the Langley Research Center to predict the discrete frequency noise of conventional and advanced helicopter rotors. The program, called WOPWOP, uses the most advanced subsonic formulation of Farassat that is less sensitive to errors and is valid for nearly all helicopter rotor geometries and flight conditions. A brief derivation of the acoustic formulation is presented along with a discussion of the numerical implementation of the formulation. The computer program uses realistic helicopter blade motion and aerodynamic loadings, input by the user, for noise calculation in the time domain. A detailed definition of all the input variables, default values, and output data is included. A comparison with experimental data shows good agreement between prediction and experiment; however, accurate aerodynamic loading is needed.

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作者
brentner, k. s.;
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年度 1986
页码 1-94
总页数 94
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Aeroacoustics; Aircraft noise; Noise prediction (Aircraft); Rotors; Aerodynamic loads; Computer programs; Discrete functions;

机译：气动声学;飞机噪声;噪声预测（飞机）;转子;气动载荷;计算机程序;离散函数;

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专利

1. Frequency-domain method for discrete frequency noise prediction of rotors in arbitrary steady motion [J] . Gennaretti M., Testa C., Bernardini G. Journal of Sound and Vibration . 2012,第25期

机译：任意平稳运动下转子离散频率噪声预测的频域方法
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机译：延迟反馈的直升机转子叶片运动稳定—建模，计算机仿真和实验验证
3. Impact of Tip-Vortex Modeling Uncertainty on Helicopter Rotor Blade-Vortex Interaction Noise Prediction [J] . Stavros Vouros, Ioannis Goulos, Calum Scullion, Journal of the American Helicopter Society . 2021,第1期

机译：尖端涡旋模型不确定性对直升机转子叶片 - 涡旋相互作用噪声预测的影响
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机译：直升机管道尾转子的声学噪声预测和缩减研究
5. UNSTEADY AERODYNAMICS IN TIME AND FREQUENCY DOMAINS FOR FINITE-TIME ARBITRARY MOTION OF HELICOPTER ROTOR BLADES IN HOVER AND FORWARD FLIGHT (AEROELASTICITY, NONLINEAR PERIODIC SYSTEMS, CASCADE AERO, MODELING, RATIONAL APPROXIMATIONS). [D] . ASGHAR-HESSARI-DINYAVARI, MEHRAN. 1985

机译：悬停和向前飞行中直升机转子叶片有限时任意运动的时间和频率域非定常气动特性（气动弹性，非线性周期系统，级联气动，建模，有理近似）。
6. Optimal location for a helicopter in a rural trauma system: prediction using discrete-event computer simulation. [O] . D. E. Clark, D. R. Hahn, R. W. Hall, 1994

机译：农村创伤系统中直升机的最佳位置：使用离散事件计算机模拟的预测。
7. Acoustic source and data acquisition system for a helicopter rotor blade-vortex interaction (BVI) noise reduction experiment [O] . Roth Brian D. 1996

机译：直升机旋翼-涡旋相互作用（BVI）降噪实验的声源和数据采集系统
8. Prediction of helicopter rotor discrete frequency noise: A computer program incorporating realistic blade motions and advanced acoustic formulation [R] . Brentner, K. S. 1986

机译：直升机旋翼离散频率噪声的预测：包含真实叶片运动和先进声学公式的计算机程序

Prediction of Helicopter Rotor Discrete Frequency Noise: A Computer Program Incorporating Realistic Blade Motions and Advanced Acoustic Formulation.

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