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Nonlinear dynamic analysis of a seismic vibrator-ground interaction system considering interval uncertainties
Abstract Seismic vibrators have wide prospections in geological exploration which can provide useful information of underground conditions for various geotechnical engineering. The enhancement of the exploration performance of the seismic vibrators closely relates to the dynamic response of the vibrator-ground (VG) system. This paper proposes an effective method for the uncertain nonlinear dynamics of the VG system. Firstly, the dynamic model of the VG system with uncertainties is developed based on the solution of the nonlinear soil-baseplate interaction. Then, the fundamental theory of the Chebyshev-based interval method and its implementation in the simulation of the VG dynamics are described. The efficiency and accuracy of the proposed method are validated by comparing with the scanning method. Finally, the effects of the multiple uncertainty parameters, sourced from both the soil conditions and the vibrator structure, on the dynamic response of the VG system are analyzed and discussed in detail. In addition, an interval sensitivity analysis is developed to evaluate and compare the effects of different uncertain parameters. The results indicate that uncertainties greatly influence the dynamics of the VG system, and their effects change with the excitation frequency and also relate to the sources of the uncertainties.
Highlights A Chebyshev-based interval method is proposed for the uncertainty analysis of the VG system. Dynamic response of the VG system with interval uncertainties is computed. Effects of multi-source uncertainties on the dynamics of the VG system are analyzed. An interval sensitivity analysis is developed to evaluate the uncertainty effects.
Nonlinear dynamic analysis of a seismic vibrator-ground interaction system considering interval uncertainties
Abstract Seismic vibrators have wide prospections in geological exploration which can provide useful information of underground conditions for various geotechnical engineering. The enhancement of the exploration performance of the seismic vibrators closely relates to the dynamic response of the vibrator-ground (VG) system. This paper proposes an effective method for the uncertain nonlinear dynamics of the VG system. Firstly, the dynamic model of the VG system with uncertainties is developed based on the solution of the nonlinear soil-baseplate interaction. Then, the fundamental theory of the Chebyshev-based interval method and its implementation in the simulation of the VG dynamics are described. The efficiency and accuracy of the proposed method are validated by comparing with the scanning method. Finally, the effects of the multiple uncertainty parameters, sourced from both the soil conditions and the vibrator structure, on the dynamic response of the VG system are analyzed and discussed in detail. In addition, an interval sensitivity analysis is developed to evaluate and compare the effects of different uncertain parameters. The results indicate that uncertainties greatly influence the dynamics of the VG system, and their effects change with the excitation frequency and also relate to the sources of the uncertainties.
Highlights A Chebyshev-based interval method is proposed for the uncertainty analysis of the VG system. Dynamic response of the VG system with interval uncertainties is computed. Effects of multi-source uncertainties on the dynamics of the VG system are analyzed. An interval sensitivity analysis is developed to evaluate the uncertainty effects.
Nonlinear dynamic analysis of a seismic vibrator-ground interaction system considering interval uncertainties
Peng, Xun (author) / Liu, Yangnanwang (author) / Hao, Lei (author)
2023-03-26
Article (Journal)
Electronic Resource
English
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