Tiltrotor Whirl-Flutter Stability Investigation using Lyapunov Characteristic Exponents and Multibody Dynamics

Gianni Cassoni, Alessandro Cocco, Aykut Tamer, Andrea Zanoni, Pierangelo Masarati

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

2 Citations (SciVal)

Abstract

This work discusses the use of Lyapunov Characteristic Exponents to assess the stability of nonlinear, time-dependent mechanical systems. Specific attention is dedicated to methods capable of estimating the largest exponent without requiring the Jacobian matrix of the problem, which can be applied to time histories resulting from existing multibody solvers. Tiltrotor whirl-flutter stability is analyzed. With respect to the available literature, the proposed method does not require the system to be strictly periodic, no linearization is required about a reference steady solution, and characteristic nonlinear aspects of stationary solutions like limit cycle oscillations are correctly identified and pointed out. A limitation lies in the ability to correctly identify the stability but no information is inferred about the related characteristic frequencies/periods, if any.

Original languageEnglish
Title of host publication48rd European Rotorcraft Forum, ERF 2022
PublisherAssociazione Italiana di Aeronautica e Astronautica (AIDAA)
Number of pages6
ISBN (Electronic)9781713870296
Publication statusPublished - 8 Sept 2022
Event48rd European Rotorcraft Forum, ERF 2022 - Winterthur, Switzerland
Duration: 6 Sept 20228 Sept 2022

Publication series

Name48rd European Rotorcraft Forum, ERF 2022

Conference

Conference48rd European Rotorcraft Forum, ERF 2022
Country/TerritorySwitzerland
CityWinterthur
Period6/09/228/09/22

Bibliographical note

Publisher Copyright:
Copyright © 2022 by author(s).

ASJC Scopus subject areas

  • Instrumentation
  • Aerospace Engineering
  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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