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Semi-analytical steady-state response prediction for multi-dimensional quasi-Hamiltonian systems |
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 |
1 College of Civil Engineering, Huaqiao University, Xiamen 361021, China; 2 Key Laboratory for Intelligent Infrastructure and Monitoring of Fujian Province, Huaqiao University, Xiamen 361021, China; 3 Department of Mechanical Engineering School of Engineering, University of California Merced, CA 95343, USA |
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Abstract 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.
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Received: 14 October 2022
Revised: 06 December 2022
Accepted manuscript online: 27 December 2022
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PACS:
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05.10.-a
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(Computational methods in statistical physics and nonlinear dynamics)
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05.10.Gg
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(Stochastic analysis methods)
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05.10.Ln
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(Monte Carlo methods)
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05.40.-a
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(Fluctuation phenomena, random processes, noise, and Brownian motion)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12072118), the Natural Science Funds for Distinguished Young Scholar of the Fujian Province, China (Grant No. 2021J06024), and the Project for Youth Innovation Fund of Xiamen, China (Grant No. 3502Z20206005). |
Corresponding Authors:
Lin-Cong Chen
E-mail: lincongchen@hqu.edu.cn
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Cite this article:
Wen-Wei Ye(叶文伟), Lin-Cong Chen(陈林聪), Zi Yuan(原子), Jia-Min Qian(钱佳敏), and Jian-Qiao Sun(孙建桥) Semi-analytical steady-state response prediction for multi-dimensional quasi-Hamiltonian systems 2023 Chin. Phys. B 32 060506
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