LAG DAMPER RESEARCH

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LAG DAMPER RESEARCH
Brano Titurus, Nick Lieven Peter Bunniss
Brano.Titurus,Nick.Lieven,Peter.Bunniss_at_bristol.
ac.uk
Lag damper research
Passive damper design
Active damper design
Model refinement
Data for validation
Test rig for validation
Control performance
R150 implement.
Evaluation concept
Model refinement for improved correlation with
experimental validation datasets.
Experiments designed for model validation,
parameter ID etc.
Test rig design for model validation, refinement
and substructuring.
Control performance studies for a range of cost
functions, response quantities and flight
conditions.
Algorithmic and software implementation of
HHC/IBC concept and new damper models into rotor
performance prediction code R150.
(Semi)active damper concept and initial
evaluation (damping capacity etc.) Model
selection and further use (e.g. in R150).
Research evolution
Passive damper design
Model validation
Lag damper on EH101
Displacement-Force profile for sine excitation
20.46 mm 3.5 Hz.
Velocity-Force profile for sine excitation 20.46
mm 3.5 Hz.
Characteristic lines for 3.5 Hz.
Attachment flexibility
Active damper design
R150 implementation
CONTROL ID
ROTOR
DAMPER
Aero-elasticity
Hydro-mechanics
Control logic
Z-transform
Runge-Kutta
HHC/IBC
Higher-Harmonic/Individual Blade Control
(HHC/IBC) schemes assuming sequences of trimmed
states.
A library of damper models for different design
options and configurations.
R150
Initialisations, data input
Modal trim convergence
(Damper) HHC/IBC controller
Damper v.X.X
Model ID
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Dcpl. logic
isID
Control logic
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Controller
Post-proc., struct.resp. etc.
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0
isNext
Analysis blocks