30th Congress of the International Council of the Aeronautical Sciences

05.2 - Flight Dynamics and Control (UAV related)

DYNAMIC MODELING AND STABILITY ANALYSIS OF A HIGH ALTITUDE AIRSHIP

R. Hun¹, N.K. Sinha¹, D. Chakraborti, ADRDE, India; P. Balasubramanian, RIC, India; ¹Indian Institute of Technology,Madras, India

The use of Lighter-Than-Air (LTAs) vehicles for telecommunication and surveillance purpose has attained a great interest in recent years. This platform is very attractive because of its long endurance and cost effectiveness. Literature suggests that shape of airship should be such that it should have significant maneuvering capabilities and stability in stratosphere. This paper provides a comprehensive shape analysis of stratospheric airship based on fineness ratio, minimum circumferential stresses, minimum drag and payload capacity, which may have huge impact on performance. Based on these analysis we have given complete 6 DOF non-linear mathematical model with static and dynamic stability analysis of high altitude airship. As airship is a buoyant vehicle, added mass effect is consider while deriving the equation of motion. Detail analysis of Linearized model is also given in the paper to compare with non-linear. Here both time domain and frequency domain techniques are used to determine the stability of linearized model. Result shows that shape used here is having better performance and stability than other shapes. The simulation of target airship is under development which has hull of length 217m and maximum diameter of 55m. All the analysis and results will be used for development of next stages.


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