中国物理B ›› 2023, Vol. 32 ›› Issue (6): 60506-060506.doi: 10.1088/1674-1056/acae7c
Wen-Wei Ye(叶文伟)1,2, Lin-Cong Chen(陈林聪)1,2,†, Zi Yuan(原子)1,2, Jia-Min Qian(钱佳敏)1,2, and Jian-Qiao Sun(孙建桥)3
Wen-Wei Ye(叶文伟)1,2, Lin-Cong Chen(陈林聪)1,2,†, Zi Yuan(原子)1,2, Jia-Min Qian(钱佳敏)1,2, and Jian-Qiao Sun(孙建桥)3
摘要: The majority of nonlinear stochastic systems can be expressed as the quasi-Hamiltonian systems in science and engineering. Moreover, the corresponding Hamiltonian system offers two concepts of integrability and resonance that can fully describe the global relationship among the degrees-of-freedom (DOFs) of the system. In this work, an effective and promising approximate semi-analytical method is proposed for the steady-state response of multi-dimensional quasi-Hamiltonian systems. To be specific, the trial solution of the reduced Fokker-Plank-Kolmogorov (FPK) equation is obtained by using radial basis function (RBF) neural networks. Then, the residual generated by substituting the trial solution into the reduced FPK equation is considered, and a loss function is constructed by combining random sampling technique. The unknown weight coefficients are optimized by minimizing the loss function through the Lagrange multiplier method. Moreover, an efficient sampling strategy is employed to promote the implementation of algorithms. Finally, two numerical examples are studied in detail, and all the semi-analytical solutions are compared with Monte Carlo simulations (MCS) results. The results indicate that the complex nonlinear dynamic features of the system response can be captured through the proposed scheme accurately.
中图分类号: (Computational methods in statistical physics and nonlinear dynamics)