Conceptual design of a small non-rigid airship with particular attention to its static and dynamic stability
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...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7308/1/24p%20AZIAN%20HARIRI.pdf http://eprints.uthm.edu.my/7308/2/AZIAN%20HARIRI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7308/3/AZIAN%20HARIRI%20WATERMARK.pdf http://eprints.uthm.edu.my/7308/ |
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| Summary: | 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. |
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