Conceptual design of a small non-rigid airship with particular attention to its static and dynamic stabilit

Hariri, Azian (2009) Conceptual design of a small non-rigid airship with particular attention to its static and dynamic stabilit. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Small size airships are traditionally designed and built based on experience rather than scientific approaches. Hence, its design approach has only been discussed in a very limited number of literatures. Thus, with these challenges at hand, a conceptual design study of airship in Malaysia was done to identify and explore the basic technology of airship design. This study focused on the conceptual design, determination of basic specifications and preliminary design of small size non-rigid airship for monitoring missions in Malaysia. The preliminary design focused on static stability, dynamic stability and development of a virtual simulator. The mathematical model of the designed airship for dynamic stability was rederived based on literatures and is then programmed to Graphical User Interface (GUI) with the aid of Matlab software. The airship was designed to fulfill the design specification suitable for monitoring with maximum speed of 40 km/h, cruising speed of20 km/h, operating altitude of 120 m and able to carry payload of at least of 6 kg. The dimension of 10 m length with maximum diameter of2.3 m was chosen with a pair of 0.25 hp engines to accomplish the desired specification. The designed airship was statically stable with trimmed angle of attack of approximately 0.18 degree. Through mathematical model of airship dynamics, following a detailed procedure including stability considerations, the airship had been analyzed and found to be dynamically stable with low control power and the time taken for the longitudinal response of elevator and vectored thrust to become stable was in the order of approximately 80 seconds while the lateral response of rudder becomes stable in approximately 30 seconds. The result of this study concluded that the designed airship fulfilled the design specification for monitoring mission and the designed airship was statically and dynamically stable during cruising speed. The virtual simulator also effectively provides a better understanding of the response of the designed airship through visualization.

Item Type:Thesis (Masters)
Subjects:T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500-778 Aeronautics. Aeronautical engineering
ID Code:1182
Deposited By:M.Iqbal Zainal A
Deposited On:12 May 2011 09:11
Last Modified:12 May 2011 09:11

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