基于CNN-LSTM-SA神经网络的薄墙的动态负载识别
Jun Wang1, Shaowei Song1,2, Chang Liu1
1National Key Laboratory of Aerospace Liquid Propulsion, Xi'an Aerospace Propulsion Institute, Xi'an 710100, China.
Materials (Basel, Switzerland)
|March 27, 2025
概括
精确的航天器载荷识别对于结构安全至关重要. 一种新的CNN-LSTM-SA神经网络方法提高了薄壁航天器结构的负载采集精度和稳定性.
科学领域:
- 航空航天工程 航空航天工程
- 结构健康监测 结构健康监测
- 机器学习应用 机器学习应用
背景情况:
- 航天器的结构安全和功能稳定性取决于了解外部飞行负载.
- 精确的负载识别对于航天器健康检测和故障预警系统至关重要.
- 传统的时间域负载识别方法通常需要复杂的反向建模.
研究的目的:
- 提出一种基于神经网络的新方法,用于精确识别薄壁航天器中的负载.
- 与传统方法相比,评估拟议方法的性能.
- 通过改进负载获取来提高航天器健康监测的可靠性.
主要方法:
- 开发一个卷积神经网络-长期短期记忆-柔软注意力 (CNN-LSTM-SA) 神经网络模型.
- 该模型在薄壁空间飞船结构上用于时间域负载识别的应用.
- 模拟和实验验证在各种噪声水平和负载类型 (正弦,随机) 下.
主要成果:
- 与其他网络结构相比,CNN-LSTM-SA方法显示出更高的识别准确性和稳定性.
- 在20%的噪音水平下,实现了根平均平方误差 (RMSE) 和平均绝对误差 (MAE) 分别为8.47和10.83.
- 实验结果显示了优异的装配性能,确定系数 (R2) 为0.98的正弦负荷和0.93的随机负荷.
结论:
- 拟议的CNN-LSTM-SA神经网络为薄壁航天器的负载识别提供了可靠和准确的方法.
- 这种方法避免了反向建模的需要,简化了负载获取过程.
- 这项研究为航天器结构健康监测和故障诊断提供了重大进展.
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