Frequency domain system identification of a light helicopter in hover

Stefano Geluardi, Frank M. Nieuwenhuizen, Lorenzo Pollini, Heinrich Bulthoff

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)


This paper presents the implementation of a Multi-Input Single-Output fully coupled transfer function model of a civil light helicopter in hover. A frequency domain identification method is implemented. It is discussed that the chosen frequency range of excitation allows to capture some important rotor dynamic modes. Therefore, studies that require coupled rotor/body models are possible. The pitch-rate response with respect to the longitudinal cyclic is considered in detail throughout the paper. Different transfer functions are evaluated to compare the capability to capture the main helicopter dynamic modes. It is concluded that models with order less than 6 are not able to model the lead-lag dynamics in the pitch axis. Nevertheless, a transfer function model of the 4th order can provide acceptable results for handling qualities evaluations. The identified transfer function models are validated in the time domain with different input signals than those used during the identification and show good predictive capabilities. From the results it is possible to conclude that the identified transfer function models are able to capture the main dynamic characteristics of the considered light helicopter in hover. Copyright

Original languageEnglish
Title of host publicationAnnual Forum Proceedings - AHS International
PublisherAmerican Helicopter Society
Number of pages11
ISBN (Print)9781632666918
Publication statusPublished - 2014
Externally publishedYes
Event70th American Helicopter Society International Annual Forum 2014 - Montreal, QC, Canada
Duration: 2014 May 202014 May 22


Other70th American Helicopter Society International Annual Forum 2014
CityMontreal, QC

ASJC Scopus subject areas

  • General Engineering


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