Integration of hydraulic lag-damper models with helicopter rotor simulations

Branislav Titurus*, Nick Lieven

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)


This paper describes the design and integration of a generic hydraulic lag-damper model into an industrial helicopter rotor simulation code. The paper explains the details of an implementation of a computational platform integrating the rotor simulation code with a damper model.Aparametric physical damper model is developed here in order to allow physically consistent improvements to helicopter performance studies. Further, this model enables investigating novel uses of lag dampers, such as for vibration reduction. The physical consistency of this work is demonstrated in two case studies. In the first instance, the damper laboratory experimental data are used for a correlation and validation study illustrating the capability of the modeling methodology to generate the model with refined response predictions. The second case study considers a physics-based lag-damper model with an active flow restrictor based on a modified version of the validated passive damper model. This realistic model is shown to be able to induce physically consistent changes in the nonrotating rotor-hub responses. A parametric study with harmonic three-per-revolution flow-restrictor activity suggests that significant load changes are possible in the nonrotating inplane hub forces and moment. The study also shows possible tradeoffs such as high damper peak forces corresponding to the reduced in-plane forces. Therefore, the presence of these tradeoffs will require the use of constrained optimization formulation to address more complex problem configurations.
Translated title of the contributionIntegration of hydraulic lag damper models with helicopter rotor simulations
Original languageEnglish
Pages (from-to)200-211
Number of pages12
JournalJournal of Guidance, Control, and Dynamics
Issue number1
Publication statusPublished - 1 Jan 2010

Bibliographical note

Publisher: AIAA


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