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Model Support Roll Balance and Roll Coupling

By Sharpes, R. E.

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Book Id: WPLBN0004285506
Format Type: PDF eBook :
File Size:
Reproduction Date: 1973-10-01

Title: Model Support Roll Balance and Roll Coupling  
Author: Sharpes, R. E.
Volume:
Language: English
Subject: Oso-7, Spectroheliographs, Systems Engineering
Collections: Government Library Collection, Government Library Collection
Historic
Publication Date:
1973
Publisher:

Citation

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E, S. R. (1973). Model Support Roll Balance and Roll Coupling. Retrieved from http://worldlibrary.in/


Description
Description: The design concepts of two specialized wind tunnel model support mechanisms are described. The forced oscillation roll balance mechanism was designed to meet the specific requirement to measure aerodynamic forces and moments to permit determination of the damping-in-roll parameters of winged configurations. A variable speed motor is used to oscillate the model by means of an offset crank. The oscillating motion is resisted by a torsion spring to provide a restoring torque and is attached to the section forward of the strain-gage balance. This spring action allows the model to be oscillated at a frequency for velocity resonance, whereby the mechanical spring and any aerodynamic spring balance. This spring action allows the model to be oscillated at a frequency for velocity resonance, whereby the mechanical spring and any aerodynamic spring balance out the model inertia. The only torque then required to oscillate the model at that particular frequency is equal to that due to aerodynamic damping. The second mechanism, a roll coupling for remotely rotating a model, was designed to invert or roll a model about its longitudinal axis when mounted for testing.; CASI; Nasa Publication Center: Langley Research Center; Unclassified; No Copyright; Unlimited; Publicly available

 

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