Flexible Multibody System Linear Modeling for Control using Component Modes Synthesis and Double-Port Approach

TL;DR

This paper introduces a novel methodology for creating parametric linear models of flexible multibody systems, combining finite element analysis with component modes synthesis and a double-port approach for improved control design.

Contribution

It presents a new integrated modeling approach that automatically assembles substructures while capturing elastic dynamics and allows for parametric variations for control and design.

Findings

Model accurately predicts flexible multibody dynamics.

Method validated against assumed modes for spacecraft.

Supports chain-like and star-like system configurations.

Abstract

The main objective of this study is to propose a methodology to build a parametric linear model of Flexible Multibody Systems for control design. This approach uses a combined Finite Element - State Space Approach based on component modes synthesis and double-port approach. The proposed scheme offers the advantage of automatic assembly of substructures, preserving the elastic dynamical behavior of the whole system. Substructures are connected following the double-port approach; i.e, through the transfer of accelerations and loads at the connection points, which take into account the dynamic coupling among them. In addition, parametric variations can be included in the model for accomplishing integrated control/structure design purposes. The method can be applied to combinations of chain-like or/and star-like flexible systems, and it is validated through its comparison with the assumed modes method for the case of a rotatory spacecraft.