Abstract Background Conventional airship mathematical modeling usually involves six coupled degrees of freedom and two inputs, namely tail thrust. The current study focuses on aerodynamic modeling. model is developed in 3D-space based plane semi-empirical a symmetric airship. depends the main geometrical parameters introduces an optimal shape design objective function established to reduce drag...

Some results from a procedure for optimising the geometrical parameters of a refrigeration twin screw compressor, such as the basic geometrical parameters of its profile and the position of its discharge port etc., were presented by the authors at the International Compressor Engineering Conference at Purdue, 1992. In this paper the optimisation technique is developed by making use of programs ...