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Gust Load Alleviation on a Large Transport Airplane

机译：减轻大型运输飞机上的阵风负荷

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摘要

This study develops an active control technology to reduce the incremental dynamic loads of a large four-engine transport airplane flying through a gust field. The mathematical model of the proposed gust-alleviation system features composite structural motions (for example, rigid-body motions, elastic vibrations, and deflections of control surfaces) and unsteady aerodynamic forces induced by the structural motions and the gusts. A clear outline of the procedure is first provided to determine the aeroservoelastic equation of the system. Then, an adaptive feedforward controller that uses the preview information of the gust sensed by an onboard alpha probe is designed to operate the ailerons symmetrically to alleviate the wing-root bending moment induced by the gust. The rigid-body motions due to travelling gusts are also compensated for using symmetrical deflections of the elevators. To solve the problems of weight drift and weight bias that are commonly encountered in adaptive control, the circular leaky least mean-squared algorithm is applied to update the weights of the adaptive controller. The simulation results show that a large transport airplane equipped with the proposed gust-alleviation system experiences a significantly lower wing-root bending moment in both stationary and nonstationary gusty environments.
机译：这项研究开发了一种主动控制技术，以减少飞过阵风场的大型四引擎运输飞机的增量动态载荷。所提出的阵风缓和系统的数学模型具有复合结构运动（例如，刚体运动，弹性振动和控制面挠度）以及由结构运动和阵风引起的不稳定的空气动力。首先提供该过程的明确概述，以确定系统的航空弹性方程。然后，使用由机载Alpha探头感测到的阵风的预览信息的自适应前馈控制器被设计为对称地操作副翼，以减轻阵风引起的机翼根部弯矩。通过使用阵风的对称偏转，也可以补偿由于阵风而引起的刚体运动。为了解决自适应控制中常见的权重漂移和权重偏差问题，采用圆形泄漏最小均方算法更新自适应控制器的权重。仿真结果表明，配备有拟议的缓解狂风系统的大型运输机在固定和非平稳的阵风环境中，机翼根部弯矩均显着降低。

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  • 来源
    《Journal of Aircraft》 |2016年第6期|1932-1946|共15页
  • 作者

    Zhao Yonghui; Yue Chengyu; Hu Haiyan;

  • 作者单位

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Dept Struct Engn & Mech, Nanjing 210016, Jiangsu, Peoples R China;

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Dept Struct Engn & Mech, Nanjing 210016, Jiangsu, Peoples R China;

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Dept Struct Engn & Mech, Nanjing 210016, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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