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首页> 外文期刊>Journal of the American Helicopter Society >Rotoreraft Vibration Reduction and Noise Prediction Using a Unified Aeroelastic Response Simulation
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Rotoreraft Vibration Reduction and Noise Prediction Using a Unified Aeroelastic Response Simulation

机译：使用统一的气弹响应模拟的旋翼机减振和噪声预测

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A numerical simulation of noise generation during closed-loop vibration reduction using actively controlled flaps (ACFs) has been conducted. To develop this simulation capability, a rotor aerodynamic model generating unsteady time-domain blade surface pressure distributions and including effects of compressibility and a free-wake was developed. This aerodynamic tool was incorporated into an aeroelastic model featuring fully coupled flap-lag-torsional dynamics and including moderate deflections. An acoustic prediction tool based on WOPWOP was also introduced and modified to fully account for blade flexibility on noise generation. This unified aeroelastic/aeroacoustic analysis program was validated with experimental aerodynamic and acoustic data. Single and dual ACF configurations were used to reduce 4/rev vibrations in descending flight, where heavy blade-vortex interaction (BVI) effects are expected, and the accompanying changes to noise generation were carefully examined. It was observed that noise on a carpet plane beneath the rotor increases by 1-3 dB for all ACF vibration reduction configurations simulated. However, imposing saturation limits on flap deflections and using the dual flap configuration-was found to reduce the acoustic penalty as a result of vibration reduction.
机译：进行了使用主动控制襟翼（ACF）进行闭环减振过程中产生噪声的数值模拟。为了开发这种仿真能力，开发了一种转子空气动力学模型，该模型生成了不稳定的时域叶片表面压力分布，并包括了可压缩性和自由苏醒的影响。这款气动工具被并入到气动弹性模型中，该模型具有完全耦合的襟翼-滞后-扭转动力学特性，并包括适度的挠度。还引入并修改了基于WOPWOP的声学预测工具，以充分考虑叶片在产生噪声方面的灵活性。该统一的空气弹性/空气声学分析程序已通过实验空气动力学和声学数据进行了验证。单和双ACF配置用于减少下降飞行中的4 / rev振动，在这种情况下预期会有严重的叶片涡旋相互作用（BVI）效应，并且仔细检查了随之产生的噪声变化。观察到，对于所有模拟的ACF减振配置，转子下方地毯平面上的噪声会增加1-3 dB。然而，发现通过对襟翼偏转施加饱和极限并使用双襟翼构造可减小由于振动减小而引起的声学损失。

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