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Analysis and design using the allowable eigenvector subspace

Research output: Contribution to journalArticlepeer-review



Publication details

JournalProceedings of the institution of mechanical engineers part g-Journal of aerospace engineering
DatePublished - 1 Jun 2002
Issue number6
Number of pages13
Pages (from-to)117 - 130
Original languageEnglish


Eigenstructure assignment has enjoyed considerable success in applications where both the modal response and mode distribution are important. However, a significant constraint on eigenvector selection is defined by an allowable subspace, the range of which varies both with model parameters and desired eigenvalue. This paper presents a technique that explores this constraint, from which analysis and design methods result. A four-input, eighth-order helicopter model is presented. The application of the novel method reveals the achievable response rates in the helicopter states, and provides information on how parameter variations affect the system dynamics. A revised eigenstructure is developed, and the resulting closed-loop system is shown to comply with handling qualities specifications while reducing cross-coupling between modes.

    Research areas

  • eigenstructure assignment, eigenmode analysis, helicopter dynamics, helicopter control, EIGENSTRUCTURE ASSIGNMENT, SYSTEMS, FEEDBACK

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