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• W2004807834 abstract "T conclusions made by Nagabhushan and Faiss concerning use of thrust vectoring as a means of controlling a hovering V/STOL airship do not follow from test results that they present. A lack of detailed information about vehicle prevents results from being independently tested. Figure 10 shows results of an attempt made by lateral autopilot to minimize sideways motion of vehicle while it encounters a 20 ft/s side gust. The airship responds by drifting nearly 275 ft at a constant velocity of 2.75 ft/s while rolled an average -22 deg. The velocity and roll angle show no sign of leveling off at end of simulation. The only conclusion made from Fig. 10 was that the error in lateral ground position of airship obtained here is surely less than corresponding response of a conventional airship having no lateral control at all. An example of an uncontrolled response was not presented for comparison and, more importantly, details of operational requirements that vehicle were to fulfill were not presented so that an assessment of control system effectiveness could be made. The question still remains as to whether a vehicle that has drifted 275 ft without any decrease in speed has been sufficiently controlled. Consider next results presented in Fig. 11. It was shown that roll experienced by vehicle while encountering a similar 20 ft/s side gust could be counteracted by a control system that utilized large gains. It was stated that the corresponding tilt rate required for favorable roll response is perhaps beyond that of a gimballed ducted fan, but associated 1000 ft drift of airship was ignored. It would have been interesting to see an example showing whether both roll angle and lateral position could be controlled using thrust vectoring. Many of assumptions and much of information inherent in results presented in Figs. 10 and 11 were ignored. Readers are not given any detail about mission vehicle is expected to perform, and under what sort of environmental conditions it is to be accomplished. This information would suggest which aspects of vehicle's state are important to control and, therefore, set limits on state variables such as roll attitude and lateral location. It is not possible to test validity of results because description of vehicle is incomplete. The data could be used by other flight simulations, such as one described by Evans and DeLaurier, to test effectiveness of control schemes. It should also be possible to explicitly define thrust vectoring control systems and their reasons for use. Lastly, aerodynamic estimation techniques that were used should have been fully described because references that were cited are not detailed enough to completely estimate aerodynamics of an airship. Jones and DeLaurier present a thorough means for estimating aerodynamic properties of typical lighter-than-air vehicles." @default.
• W2004807834 created "2016-06-24" @default.
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• W2004807834 date "1985-04-01" @default.
• W2004807834 modified "2023-09-26" @default.
• W2004807834 title "Comment on Thrust Vector Control of a V/STOL Airship" @default.
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• W2004807834 doi "https://doi.org/10.2514/3.56751" @default.
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