Aeroservoelastic Encounters

Felt, Larry; Huttsell, Lawrence J.; Noll, Thomas; Cooley, D. E.

doi:10.2514/3.58551

Cited by 32 publications

(6 citation statements)

References 2 publications

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“…It was corrected by appropriate notch filter design. Other instances of aeroservoelastic instabilities described in Felt et al (1979) are related to the YF-17, F-4 and the B-52 CCV. In the YF-17, FCS modifications were made to minimize ASE interactions.…”

Section: Introductionmentioning

confidence: 98%

“…Some instances of structure control coupling that have occurred are reported in the literature. One of the earlier occurrences is the B-36 autopilot developed in 1948, where sensor pickup of fuselage bending was experienced and solved by shifting the sensor package (Felt et al 1979). In the YF-16, ASE instability was experienced at high subsonic Mach number and was attributed to coupling between the flight control system and the antisymmetric pitch mode of wing tip missile (Felt et al 1979, Allen et al 1986.…”

Section: Introductionmentioning

confidence: 99%

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Model updation using multiple parameters influencing servoelastic response of a flexible aircraft

Srinivasan¹,

Joshi²

2017

Advances in aircraft and spacecraft science

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In a flexible airvehicle, an assessment of the structural coupling levels through analysis and experiments provides structural data for the design of notch filters which are generally utilized in the flight control system to attenuate the flexible response pickup. This is necessitated as during flight, closed loop control actuation driven with flexible response inputs could lead to stability and performance related problems. In the present work, critical parameters influencing servoelastic response have been identified. A sensitivity study has been carried out to assess the extent of influence of each parameter. A multi-parameter tuning approach has been implemented to achieve an enhanced analytical model for improved predictions of aircraft servoelastic response. To illustrate the model updation approach, initial and improved test analysis correlation of lateral servoelastic responses for a generic flexible airvehicle are presented.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Model updation using multiple parameters influencing servoelastic response of a flexible aircraft

Srinivasan¹,

Joshi²

2017

Advances in aircraft and spacecraft science

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“…This interaction, known as aeroservoelasticity, can have many serious consequences such as loss of satisfactory rigid body control, undue system fatigue and wear, and possible structural failure (Zimmerman, 1990;Felt et al, 1979;Noll, 1990;Peloubet, 1975;Kehoe et cal9 1990). It is essential, therefore, that FCS designers avoid such interactions as much as possible.…”

Section: Introductionmentioning

confidence: 98%

The effects of sampled signals on the flight control system of an agile combat aircraft with a flexible structure

Taylor

Pratt

Caldwell

1996

Transactions of the Institute of Measurement and Control

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The introduction of digital flight control systems in modern aircraft has created an additional factor in the analysis and prevention of aeroservoelastic interactions. This paper focuses on the propagation of signals through an aeroservoelastic system incorporating a digital flight control system. It is shown that the digital system will increase the seriousness of the aeroservoelastic, effects due to aliasing . The contribution to the process of the zero-order-hold is explained, and additionally the possible consequences of high-frequency signals on the performance of the actuation system is examined. Finally, the paper offers general guidelines when designing filters for the attenuation of structural modes, including the significance of the phase, in the digital flight control system.

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“…The phrase Structural Coupling (also known as Aeroservoelasticity) is used to describe the interactions between the structural dynamics, the aerodynamics and the Flight Control System (FCS) Figure 1 Airframe Interactions of an aircraft (Felt, et al, 1979). These interactions are shown in Figure 1.…”

Section: Structural Couplingmentioning

confidence: 99%

Filtering Structural Modes in Aircraft: Notch Filters vs Kalman Filters

Halsey

Goodall

Caldwell

et al. 2005

IFAC Proceedings Volumes

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The disturbances to an airframe's sensors caused by the flexibility of the airframe is called structural coupling. Notch filters are currently used to attenuate the effect that the structural modes have on the aircraft's inertial flight control sensors. However, this approach is becoming more problematic with modern combat aircraft. A complex model which is representative of an agile combat aircraft has been developed, and a Kalman filter has been designed to reduce the effects of structural coupling. This work forms part of an ongoing project in conjunction with BAE Systems.

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Aeroservoelastic Encounters

Cited by 32 publications

References 2 publications

Model updation using multiple parameters influencing servoelastic response of a flexible aircraft

Model updation using multiple parameters influencing servoelastic response of a flexible aircraft

The effects of sampled signals on the flight control system of an agile combat aircraft with a flexible structure

Filtering Structural Modes in Aircraft: Notch Filters vs Kalman Filters

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