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research-article

Computation of multiple dynamic response patterns of a flexible multibody system with uncertain random parameters

[+] Author and Article Information
Qiang Tian

MOE Key Laboratory of Dynamics and Control of Flight Vehicle, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
tianqiang_hust@aliyun.com

Zhe Wang

MOE Key Laboratory of Dynamics and Control of Flight Vehicle, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
cwangzhe@126.com

Haiyan Hu

MOE Key Laboratory of Dynamics and Control of Flight Vehicle, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
haiyan_hu@bit.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041580 History: Received May 24, 2018; Revised September 15, 2018

Abstract

The mechanisms with uncertain parameters may exhibit multiple dynamic response patterns. As a single surrogate model can hardly describe all the dynamic response patterns of mechanism dynamics, a new computation methodology is proposed to study multiple dynamic response patterns of a flexible multibody system with uncertain random parameters. The flexible multibody system of concern is modeled by using a unified mesh of the Absolute Nodal Coordinate Formulation (ANCF). The Polynomial Chaos Expansion (PCE) with collocation methods is used to generate the surrogate model for the flexible multibody system with random parameters. Several sub-surrogate models are used to describe multiple dynamic response patterns of the system dynamics. By the motivation of the data mining, the Dirichlet Process Mixture Model (DPMM) is used to determine the dynamic response patterns and project the collocation points into different patterns. The uncertain Differential Algebraic Equations (DAEs) for the flexible multibody system are directly transformed into the uncertain nonlinear algebraic equations by using the generalized-alpha algorithm. Then, the PC expansion is further used to transform the uncertain nonlinear algebraic equations into several sets of nonlinear algebraic equations with deterministic collocation points. Finally, two numerical examples are presented to validate the proposed methodology. The first confirms the effectiveness of the proposed methodology, and the second one shows the effectiveness of the proposed computation methodology in multiple dynamic response patterns study of a complicated spatial flexible multibody system with uncertain random parameters.

Copyright (c) 2018 by ASME
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