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Analysis of the stability modes of the non-rigid airship

Published online by Cambridge University Press:  04 July 2016

M. V. Cook ,
J. M. Lipscombe  and
F. Goineau
M. V. Cook
Affiliation:
Flight Test and Dynamics Group, College of Aeronautics, Cranfield University, Cranfield, Bedford, UK
J. M. Lipscombe
Affiliation:
Flight Test and Dynamics Group, College of Aeronautics, Cranfield University, Cranfield, Bedford, UK
F. Goineau
Affiliation:
Flight Test and Dynamics Group, College of Aeronautics, Cranfield University, Cranfield, Bedford, UK
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Abstract

This paper describes and compares various analyses leading to the development of approximate models for the linear stability modes of the non-rigid airship. The progress of the analyses was variously dependent on assumptions made from the detailed scrutiny of linear numerical models for three airships. For each airship studied, the linear models were obtained from non-linear simulation models by linearising about a number of chosen trim speeds representative of a typical speed envelope. The decoupled linear models comprised the longitudinal and lateral-directional state equations of the neutrally buoyant airship, for speeds from the hover to 30m/sec. Since the fidelity of the earliest airship models was not known, the principal purpose of this paper is to re-visit the original analysis using a later airship model of known excellent fidelity.

The longitudinal modes of the airship comprise the surge mode, the heave-pitch subsidence mode and the oscillatory pitch-incidence mode. The lateral-directional modes of the airship comprise the sideslip subsidence mode, the yaw subsidence mode and the oscillatory roll pendulum mode. Approximate models for these modes are derived and expressed in terms of concise aerodynamic stability derivatives. The mode characteristics are discussed, and the approximate models are compared with the actual airship modes over the typical airspeed envelope.

Type
Research Article
Information
The Aeronautical Journal , Volume 104 , Issue 1036 , June 2000 , pp. 279 - 290
Copyright
Copyright © Royal Aeronautical Society 2000 

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References

1. Bairstow, L. Applied Aerodynamics. Longmans Green, London 1920.Google Scholar
2. Gomes, S.B.V. An investigation of the flight dynamics of airships with application to the YEZ-2A. College of Aeronautics PhD thesis, Cranfield Institute of Technology 1990.Google Scholar
3. Lipscombe, J. M. Unpublished communication. College of Aeronautics, Cranfield Institute of Technology 1988.Google Scholar
4. Crawford, J.P Research into the flying and handling qualities of an airship. MSc thesis, College of Aeronautics, Cranfield Institute of Technology 1993.Google Scholar
5. Goineau, F. and Cook, M.V. The stability and control characteristics of the neutrally buoyant non-rigid airship. College of Aeronautics Report No: 9911, Cranfield University 1999.Google Scholar
6. Cook, M.V. Stability and control Chapter IV in Airship Technology. Khoury, G.A and Gillett, J.D (Eds). Cambridge University Press 1999.Google Scholar
7. Lewis, D.J., Lipscombe, J.M. and Thomasson, P.G. The simulation of remotely operated underwater vehicles. Proc ROV'84 Conference and Exposition, The Marine Technology Society, San Diego, California 1984.Google Scholar