Distribution-free P-box processes based on translation theory

Definition and simulation

authored by: Matthias G.R. Faes, Matteo Broggi, Guan Chen, Kok Kwang Phoon, Michael Beer
Abstract: Typically, non-deterministic models of spatial or time dependent uncertainty are modelled using the well-established random field framework. However, while tailored for exactly these types of time and spatial variations, stochastic processes and random fields currently have only limited success in industrial engineering practice. This is mainly caused by its computational burden, which renders the analysis of industrially sized problems very challenging, even when resorting to highly efficient random field analysis methods such as EOLE. Apart from that, also the methodological complexity, high information demand and rather indirect control of the spatial (or time) variation has limited its cost–benefit potential for potential end-users. This data requirement was recently relaxed by some of the authors with the introduction of imprecise random fields, but so far the method is only applicable to parametric p-box valued stochastic processes and random fields. This paper extends these concepts by expanding the framework towards distribution-free p-boxes. The main challenges addressed in this contribution are related to both the non-Gaussianity of realisations of the imprecise random field in between the p-box bounds, as well as maintaining the imposed auto-correlation structure while sampling from the p-box. Two case studies involving a dynamical model of a car suspension and the settlement of an embankment are included to illustrate the presented concepts.
Organisation(s): Institute for Risk and Reliability
External Organisation(s): TU Dortmund University
Wuhan University
Singapore University of Technology and Design
University of Liverpool
Tongji University
Type: Article
Journal: Probabilistic Engineering Mechanics
Volume: 69
ISSN: 0266-8920
Publication date: 07.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Statistical and Nonlinear Physics, Civil and Structural Engineering, Nuclear Energy and Engineering, Aerospace Engineering, Condensed Matter Physics, Ocean Engineering, Mechanical Engineering
Electronic version(s): https://doi.org/10.1016/j.probengmech.2022.103287 (Access: Closed)