龙溪口防护堤变形在线监控模型构建与优化

龙溪口库区防护堤的地质条件与运行环境复杂，如何利用原型监测数据实现其安全运行状态的在线监控是亟待解决的关键问题。针对传统监控模型在非线性特征的监测序列方面存在泛化性差、精度低等问题，基于长短时记忆神经网络(LSTM)算法，以水位、温度、时效为输入量，变形为输出量，构建防护堤LSTM在线变形监控模型。通过对比分析不同模型参数对精度的影响规律，揭示学习率>分块尺寸>最大迭代次数>隐藏层单元数的多参数敏感性规律，并提出相关参数的建议取值。工程应用表明，该模型精度高，适用性和稳定性强。     

Numerical method of electromagnetic pulse response of conductor with complex load北大核心CSCD

[Objectives]Electromagnetic pulse can seriously affect and even destroy naval shipborne electronic information systems, weapons, equipment and so on. Due to the complexity of the antenna port load circuit, it is necessary to formulate a numerical method which can easily obtain the antenna load current. [Methods]The induced current of the terminal is obtained on the basis of the finite-difference time-domain (FDTD) and Holland model. According to the Thévenin equivalent circuit, the conductor is equivalent to the voltage source to realize decoupling between the conductor and load end, and the load circuit is solved using Simulink software.[Results]Compared with the traditional terminal model, this method is simple and feasible for high-order circuit processing. The effectiveness of the model is verified using non-linear elements and parallel capacitors and resistors as the load respectively. The results show that the calculation results of this method are consistent with those of the traditional methods. Finally, the antenna of the end-connected protect- or is calculated. The results show that the lead inductance caused by the installation of the protector is an important factor affecting the protection performance.[Conclusions]The method proposed in this paper can greatly reduce the simulation complexity of the coupling current of an antenna with a complex load, giving it useful reference value for the field of ship electromagnetic pulse protection design. © 2023 Editorial Department of Chinese Journal of Ship Research. All Rights Reserved.