Effect of nonlinear substructure behavior on uncertainty quantification for hybrid simulation
Hybrid simulation integrates physically tested experimental substructures and numerically modeled analytical substructures and enables large-scale experiments in size-limited laboratories.An integration algorithm is utilized to compute the structural response based on deterministic properties of analytical substructures.These properties in practice however often involve uncertainties.How to quantify these uncertainties through hybrid simulation presents a challenge to utilize this advanced experimental technique to its full potential.Polynomial chaos expansion(PCE)projects the model outputs on a basis of orthogonal stochastic polynomials to account for influences of model uncertainties.This study explores to evaluate effect of different nonlinear behavior on quantifying uncertainty using the PCE approach.Two different nonlinearities are considered including the elastic plastic hysteresis with hardening and the flag-shape hysteresis.The order of PCE,the number of sample points as well as the method for coefficients calculation are first discussed.The PCE approach is then applied to determine the mean,variance and Sobol indices for the maximum response of the structure under consideration.Results show that different substructure nonlinearity should be accounted for the uncertainty quantification analysis.
hybrid simulation polynomial chaos expansion nonlinearity uncertainty quantification
Cheng Chen Yifeng Xu
School of Engineering,San Francisco State University,San Francisco,CA 94132,United States
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
1285-1294
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）