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首页> 外文期刊>Journal of the American Helicopter Society >Rotorcraft Lateral-Directional Oscillations: The Anatomy of a Nuisance Mode
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Rotorcraft Lateral-Directional Oscillations: The Anatomy of a Nuisance Mode

机译：旋翼飞机横向方向振荡：滋扰模式的解剖结构

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摘要

High-fidelity rotorcraft flight simulation relies on the availability of a quality flight model that further demands a good level of understanding of the complexities arising from aerodynamic couplings and interference effects. One such example is the difficulty in the prediction of the characteristics of the rotorcraft lateral-directional oscillation (LDO) mode in simulation. Achieving an acceptable level of the damping of this mode is a design challenge requiring simulation models with sufficient fidelity that reveal sources of destabilizing effects. This paper is focused on using System Identification to highlight such fidelity issues using Liverpool's FLIGHTLAB Bell 412 simulation model and in-flight LDO measurements from the bare airframe National Research Council's (Canada) Advanced Systems Research Aircraft. The simulation model was renovated to improve the fidelity of the model. The results show a close match between the identified models and flight test for the LDO mode frequency and damping. Comparison of identified stability and control derivatives with those predicted by the simulation model highlight areas of good and poor fidelity.
机译：高保真旋翼飞行飞行模拟依赖于优质飞行模型的可用性，这进一步要求对来自空气动力学联轴器产生的复杂性的良好理解水平和干扰效应。一个这样的示例是在模拟中预测旋转频横向振荡（LDO）模式的特性难以预测。实现这种模式的阻尼的可接受水平是一种设计挑战，需要具有足够保真度的模拟模型，揭示了稳定效果的来源。本文专注于使用系统识别，突出使用利物浦的FlightLab响铃412仿真模型和来自Bare Airframe国家研究委员会（加拿大）先进系统研究飞机的飞行方式和飞行LDO测量等忠诚问题。仿真模型被翻新以提高模型的保真度。结果显示了LDO模式频率和阻尼的所识别的模型和飞行试验之间的良好匹配。鉴定稳定性和控制衍生物与模拟模型预测的稳定性和控制衍生物的比较突出显示了良好且良好的保真度。

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