TY - JOUR

T1 - Uncertain Dynamic Characteristic Analysis for Structures with Spatially Dependent Random System Parameters

AU - Du, Wenyi

AU - Ma, Juan

AU - Zhou, Changhu

AU - Yan, Yongchun

AU - Wriggers, Peter

N1 - Funding Information: The authors gratefully acknowledge the support of Natural Science Foundation of China (Grant No. 11572233) and Pre-Research Foundation (Grant No. 61400020106) to the project. The authors sincerely appreciate the reviewers for their valuable and constructive comments.

PY - 2023/1/30

Y1 - 2023/1/30

N2 - This work presents a robust non-deterministic free vibration analysis for engineering structures with random field parameters in the frame of stochastic finite element method. For this, considering the randomness and spatial correlation of structural physical parameters, a parameter setting model based on random field theory is proposed to represent the random uncertainty of parameters, and the stochastic dynamic characteristics of different structural systems are then analyzed by incorporating the presented parameter setting model with finite element method. First, Gauss random field theory is used to describe the uncertainty of structural material parameters, the random parameters are then characterized as the standard deviation and correlation length of the random field, and the random field parameters are then discretized with the Karhunen–Loeve expansion method. Moreover, based on the discretized random parameters and finite element method, structural dynamic characteristics analysis is addressed, and the probability distribution density function of the random natural frequency is estimated based on multi-dimensional kernel density estimation method. Finally, the random field parameters of the structures are quantified by using the maximum likelihood estimation method to verify the effectiveness of the proposed method and the applicability of the constructed model. The results indicate that (1) for the perspective of maximum likelihood estimation, the parameter setting at the maximum value point is highly similar to the input parameters; (2) the random field considering more parameters reflects a more realistic structure.

AB - This work presents a robust non-deterministic free vibration analysis for engineering structures with random field parameters in the frame of stochastic finite element method. For this, considering the randomness and spatial correlation of structural physical parameters, a parameter setting model based on random field theory is proposed to represent the random uncertainty of parameters, and the stochastic dynamic characteristics of different structural systems are then analyzed by incorporating the presented parameter setting model with finite element method. First, Gauss random field theory is used to describe the uncertainty of structural material parameters, the random parameters are then characterized as the standard deviation and correlation length of the random field, and the random field parameters are then discretized with the Karhunen–Loeve expansion method. Moreover, based on the discretized random parameters and finite element method, structural dynamic characteristics analysis is addressed, and the probability distribution density function of the random natural frequency is estimated based on multi-dimensional kernel density estimation method. Finally, the random field parameters of the structures are quantified by using the maximum likelihood estimation method to verify the effectiveness of the proposed method and the applicability of the constructed model. The results indicate that (1) for the perspective of maximum likelihood estimation, the parameter setting at the maximum value point is highly similar to the input parameters; (2) the random field considering more parameters reflects a more realistic structure.

KW - free vibration

KW - Karhunen–Loeve expansion

KW - multi-dimensional kernel density estimation

KW - random dynamic characteristic

KW - random field

UR - http://www.scopus.com/inward/record.url?scp=85147855122&partnerID=8YFLogxK

U2 - 10.3390/ma16031188

DO - 10.3390/ma16031188

M3 - Article

AN - SCOPUS:85147855122

VL - 16

JO - MATERIALS

JF - MATERIALS

SN - 1996-1944

IS - 3

M1 - 1188

ER -