In this paper, bifurcation analysis of a full six degrees of freedom model of an airship is carried out both in unconstrained and constrained conditions. Equations of motion of airship are first modified to a suitable form and a standard as well as constrained bifurcation analysis performed with respect to airship control and design parameters. Typical modes of airship dynamics and regions of stable flights are identified via this analysis. Loss of stability and mode responsible for onset of instability at critical parameter values are also identified. © 2016 IEEE.

Nandan Kumar Sinha

Department of Aerospace Engineering

Anshul Tiwari

Aerospace engineering

Bifurcation (mathematics)

Degrees of freedom (mechanics)

Equations of motion

stability

Bifurcation analysis

CONSTRAINED CONDITIONS

CRITICAL PARAMETER VALUES

LIGHTER THAN AIR (LTA)

Non-linear stabilities

Onset of instabilities

Six degrees of freedom

Stability analysis

Airships

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IIT Madras

Airship trim and stability analysis using bifurcation techniques

Proceedings of 2016 7th International Conference on Mechanical and Aerospace Engineering, ICMAE 2016

The prime objective of this work is to estimate stability and control derivatives of an airship. The complete, nonlinear mathematical model of aerial vehicles has its aero model as a nonlinear function of angle of attack. This along with the necessity for an exhaustive dataset complicates the estimation procedure. In this work, data are generated by simulating the mathematical model of airship for different trim conditions obtained from continuation analysis. A modular neural network is then trained using back-propagation and Adam optimization algorithm for each aerodynamic coefficient separately. The estimated nonlinear airship parameters are found to be consistent with the DATCOM parameters which were used for open-loop simulation in data generation phase. This validates the proposed methodology and could be extended to estimate airship parameters from real flight data. © 2019 IEEE.

2019 5th Indian Control Conference, ICC 2019 - Proceedings

Estimation of nonlinear airship parameters using modular neural network

This paper addresses the issue of designing a feasible set of trajectories for a stratospheric airship model with the help of bifurcation based direct continuation methodology. An airship envelope is framed based on the maneuverability characteristics of the airship in the steady level circular turn maneuver. From the propounded envelope, appropriate trajectories are defined based on the application to which the airship is deployed. The proposed trajectories are then maneuvered using the nonlinear sliding mode based controller in conjunction with the three dimensional lookahead-based steering guidance law. The pertinent simulation results are presented to prove the efficacy of the designed hover corridor for the airship. © 2018

Fulltext

IFAC-PapersOnLine

Hover Corridor for a Stratospheric Airship

Who's Who

Mynott, Dr (Roger) Jeremy, (born 15 Feb. 1942), Chief Executive of the Press, Secretary of the Press Syndicate and University Printer, Cambridge University Press, 1999–2002; Fellow, Wolfson College, Cambridge, 1999–2009, now Emeritus

Baynham, Prof. Alexander Christopher, (born 22 Dec. 1935), strategic technical consultant, since 1996; Principal, Cranfield University (formerly Cranfield Institute of Technology) (Shrivenham Campus), 1989–96, now Emeritus Professor

45th AIAA Aerospace Sciences Meeting and Exhibit

Use of Bifurcation and Continuation Methods for Aircraft Trim and Stability Analysis - A State-of-the-Art

ACM Transactions on Mathematical Software (TOMS)

MATCONT

Inertial fusion research. Annual technical report, 1979

Journal	Data powered by TypesetProceedings of 2016 7th International Conference on Mechanical and Aerospace Engineering, ICMAE 2016
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open Access	No