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Multi-objective conceptual design optimization of a domestic unmanned airship

Amani S., Pourtakdoust S. H., Pazooki F.

Journal of Theoretical and Applied Mechanics

2014

Vol. 52 nr 1

47--60

Autonomous airships have gained a high degree of importance over the last decades, both theoretically as well and practically. This is due to their long endurance capability needed for monitoring, observation and communication missions. In this paper, a Multi-Objective Optimization approach (MOO) is followed for conceptual design of an airship taking aerody- namic drag, static stability, performance as well as the production cost that is proportional to the helium mass and the hull surface area, into account. Optimal interaction of the afo- rementioned disciplinary objectives is desirable and focused through the MOO analysis. Standard airship configurations are categorized into three major components that include the main body (hull), stabilizers (elevators and rudders) and gondola. Naturally, component sizing and positioning play an important role in the overall static stability and performance characteristics of the airship. The most important consequence of MOO analysis is that the resulting design not only meets the mission requirement, but will also be volumetrically optimal while having a desirable static and performance characteristics. The results of this paper are partly validated in the design and construction of a domestic unmanned airship indicating a good potential for the proposed approach.

Preparation, Spectroscopy and Magnetism of Di-mi-methoxy bis[copper(II)(benzo[d]pyridazine-1(2H)-one)2]2+ with NO- 3 or CIO- 4 as the Counter-ion

Sadeghy N., Amani S.

Polish Journal of Chemistry

2005

Vol. 79 / nr 11

1749-1755

The synthesis, spectrocopic and magnetic characterization of two new methoxo-bridged copper(II) complexes are described. Both compounds have the general formula [Cu(m-OCH3)(L)2]2X2, in which X = NO3 or ClO4 and L = benzo[d]pyridazine- 1(2H)- one (abbreviated L). The title compounds all consist of dinuclear units with methoxo-bridging group. Both complexes have been synthesized in one-step reaction, and characterized by elemental analysis, FTIR and electronic spectra and by magnetic properties. The compounds exhibit antiferromagnetic interaction at room temperature. The absorption bands, attributed to d-d transition of copper(II) ion, ligandŽmetal charge transition and pŽp* or nŽp* transitions of ligand. The IR spectra ind cate Cu2O2 ringvibrations in 540-440 cm-1 range. The magnetic properties of the [Cu2(OCH3)2(L)4](NO3)2 has been in vestigated in the 6-268 K range and a singlet-trilet energy gap of -145 cm-1 was observed.