62 research outputs found
Simulations for the Test Flight of an Experimental HALE Aircraft
Recent events, such as the crash of NASA\u27s Helios aircraft during a test flight, show that more must be known about the nonlinear control of HALE aircraft. Shearer, Cesnik and their co-workers have developed a code that is a practical solution to the coupled nonlinear aeroelasticity and flight dynamics of very flexible aircraft called the University of Michigan\u27s Nonlinear Aeroelastic Simulation Toolbox (UM/NAST). They are also in the process of developing a model HALE aircraft called X-HALE which will be used to validate this code experimentally. This research performs flight simulations with UM/NAST so as to make predictions about X-HALE\u27s future test flights and subsequently uncover the strengths and weaknesses of UM/NAST when X-HALE is finally flown. These simulations include simulations of straight and level flight and rolling flight. Rolling simulations involve periodic changes in the angle of the ailerons. Both the 6 meter and the 8 meter models of X-HALE are studied. Two control models are compared. These include the linear and non-linear models of UM/NAST
Molecular Structure, Conformational Analysis, and Electronic Spectra of 1-Phenyl-1-aza- c
Synthesis, Strain, Conformational Analysis, and Molecular and Crystal Structures of 1,1,4,4-Tetraphenyl-1,4-disilacyclohexane and 1,1,4,4-Tetraphenyl-1,4-disilacyclohexa-2,5-diene †
Influence of 3-pentylbicyclo[1.1.1]pentane-1-carboxylic acid on a simplified stratum corneum lipid structure
T-Shaped Molecular Building Blocks by Combined Bridgehead and Bridge Substitution on Bicyclo[1.1.1]pentanes
Induction of smectic behaviour in a carborane‐containing mesogen. Tail fluorination of a three‐ring nematogen and its miscibility with benzene analogues
Cobalt(II) and Cobalt(III) Dipicolinate Complexes: Solid State, Solution, and in Vivo Insulin-like Properties
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