arXiv:2603.23496cs.LG2026-03

用结构振动数据估算飞行器速度和迎角,无需传统测压设备。

Estimating Flow Velocity and Vehicle Angle-of-Attack from Non-invasive Piezoelectric Structural Measurements Using Deep Learning

  • 通过贴在壳体内的压电传感器捕捉湍流压力引起的振动信号
  • 卷积神经网络将振动信号反演为速度误差<2.27m/s,迎角误差<0.44°
  • 适用于风洞实验中复杂变工况的非侵入式状态估计

准确估算自由流速度和迎角(AoA)对气动载荷预测、飞行控制和模型验证至关重要。本文提出一种非侵入式方法,基于结构振动测量而非传统皮托管等流场仪器来估算车辆速度与迎角。在气动壳体内壁布置密集压电传感器阵列,采集湍流边界层压力脉动引发的振动信号,再使用卷积神经网络(CNN)逆向求解出速度与迎角。在桑迪亚国家实验室高超音速风洞中开展验证实验,覆盖零与非零迎角、马赫数5与8、恒定及连续变化运行条件。利用16次风洞试验数据训练并评估CNN,每组试验内选取时间中心区域作为独立测试集以评估跨时序泛化能力。原始CNN输出在变工况下方差增大;引入短窗移动中值后处理可有效抑制波动,提升鲁棒性。后处理后,速度相对低通滤波参考值的平均误差低于2.27 m/s(0.21%),迎角平均误差为0.44°(8.25%),证明了在受控实验室环境下基于振动信号进行速度与迎角估计的可行性。

原文摘要 · Abstract (English)

Accurate estimation of aerodynamic state variables such as freestream velocity and angle of attack (AoA) is important for aerodynamic load prediction, flight control, and model validation. This work presents a non-intrusive method for estimating vehicle velocity and AoA from structural vibration measurements rather than direct flow instrumentation such as pitot tubes. A dense array of piezoelectric sensors mounted on the interior skin of an aeroshell capture vibrations induced by turbulent boundary layer pressure fluctuations, and a convolutional neural network (CNN) is trained to invert these structural responses to recover velocity and AoA. Proof-of-concept is demonstrated through controlled experiments in Sandia's hypersonic wind tunnel spanning zero and nonzero AoA configurations, Mach~5 and Mach~8 conditions, and both constant and continuously varying tunnel operations. The CNN is trained and evaluated using data from 16 wind tunnel runs, with a temporally centered held-out interval within each run used to form training, validation, and test datasets and assess intra-run temporal generalization. Raw CNN predictions exhibit increased variance during continuously varying conditions; a short-window moving-median post-processing step suppresses this variance and improves robustness. After post-processing, the method achieves a mean velocity error relative to the low-pass filtered reference velocity below 2.27~m/s (0.21\%) and a mean AoA error of $0.44^{\circ} (8.25\%)$ on held-out test data from the same experimental campaign, demonstrating feasibility of vibration-based velocity and AoA estimation in a controlled laboratory environment.

状态估计压电传感深度学习风洞实验

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