AIAA 99-1317 CONTROL LAW SYNTHESIS FOR VERTICAL FIN BUFFETING ALLEVIATION (2008)
Using Strain Actuation, F. Nitzsche, D. G. Zimcik, T. G. Ryall, R. W. Moses, D. A. Henderson
In the present investigation, the results obtained during the ground test of a closed-loop control system conducted on a full-scale fighter to attenuate vertical fin buffeting response using strain...
T. G. Ryall, R. W. Moses, D. G. Zimcik, F. Nitzsche, Ka Or
High performance aircraft are, by their very nature, often required to undergo manoeuvres involving high angles of attack. Under these conditions unsteady vortices emanating from the wing and the...
Using Strain Actuation, F. Nitzsche, D. G. Zimcik, T. G. Ryall, R. W. Moses, ...
In the present investigation, the results obtained during the ground test of a closed-loop control system conducted on a full-scale fighter to attenuate vertical fin buffeting response using strain...
This paper deals with a simple tool for the calculation of the linear and non-linear behaviour of hingeless rotor blades with uneven blade properties. The calculation bases on the Galerkin Method...
Buffet Load Alleviation (1999)
T. G. Ryall, R. W. Moses, M. A Hopkins, D. Henderson, D. G. Zimcik, F. Nitzsche, ...
High performance aircraft are, by their very nature, often required to undergo manoeuvres involving high angles of attack. Under these conditions unsteady vortices emanating from the wing and the...
Designing Efficient Helicopter Individual Blade Controllers Using Smart Structures. (1994)
The individual blade control of bearingless composite helicopter rotors aiming at vibration attenuation using adaptive structures is studied in this paper. A periodic model-following regulator is...
This investigation discusses some proposed techniques to attentuate rotary wing vibration using smart materials. Advantages and disadvantages of these solutions are analyzed in greater detail....
Dynamic Aeroelastic Stability of Vertical-Axis Wind Turbines under Constant Wind Velocity. (1994)
The flutter problem associated with the blades of a class of vertical-axis wind turbines called Darrieus is studied in detail. The spinning blade is supposed to be initially curved in a particular...
Whirl-Flutter Suppression in Advanced Turboprops and Propfans by Active Control Techniques. (1994)
The feasibility of using the active control technique to suppress the whirl-Flutter instability of advanced turboprops is further investigated. Aerodynamic vanes are incorporated at the engine...
Individual Blade Control of Hinged Blades Using Smart Structures (1994)
The feasibility of employing piezoceramic smart materials in active control of the higher harmonic vibration of hinged helicopter blades is investigated. The individual-blade-control concept is...
Vibration Control of Rotary Wings Using Smart Structures (1994)
The problem of vibration reduction of rotary wings in forward flight is studied using the concept of individual blade control. Smart structures are used as a means to construct geometric modal...
Smart Modal Sensors and Actuators for Aeroservoelastic Applications. (1993)
This paper describes a general method to develop modal filters to individually control aeroelastic modes using adaptive materials. An example of a composite wing demonstrates that high spillover...
Modal Sensors and Actuators for Individual Blade Control. (1993)
A general method to incorporate independent modal control to the individual blade control of rotary wings is described. Piezoelectric material may be embedded inthe blade structure and conveniently...
Vibration Control of Rotary Wings Using Smart Structures. (1993)
The problem of vibration reduction of rotary wings in forward flight is studied using the concept of individual blade control. Smart structures are used as a means to construct geometric modal...
An Implicit Model-Following Controller is developed in the modal domain to attenuate the vibration characteristics of helicopter rotors using adaptive structures. The dynamics of the blade in the...
Independent Modal Control for Non-Self-Adjoint Problems. (1993)
This study describes a general method of using the independent-modal-control concept in aeroservoelastic systems. Geometric modal filters, developed to individually control free-vibration modes using...
Can Smart Materials Modify Blade Root Boundary Conditions to Attenuate Helicopter Vibration? (1993)
Nitzsche, F., Lammering, R., Breitbach, E.
The feasibility studies of a new solution for the individual blade control aiming at helicopter vibration reduction are performed. Adaptive material actuators are installed at the blade root to...
Nitzsche, F. (1), Breitbach, E.
The performance of a single input, single output, individual blade control system, designed to attenuate the helicopter rotor vibration using piezoelectric crystals (PZT) embedded in the blade...
Nitzsche, F. (1), Breitbach, E.
This paper investigates the feasibility of employing adaptive material to build both sensors and actuators to attenuate the higher harmonic loads developed at the helicopter rotor blades using the...
Individaual Blade Control of Hinged Blades Using Smart Structures. (1992)
Nitzsche, F. (1), Breitbach, E.
The feasibility of employing piezoceramic smart materials in active control of the higher harmonic vibration of hinged helicopter blades is investigated. The individual-blade-control concept is...
The feasibility of using the active control technique to suppress the whirl-flutter instability of advanced turboprops is further investigated. Aerodynamic vanes are incorporated at the engine...