Engineering topics
Blackwood, Gary H.
Publications and source records attributed to Blackwood, Gary H..
Exoplanet and Excellence NASA's Search for Life in our Galaxy
No abstract provided
The NASA Exoplanet Exploration Program: Recent Results and Future Directions
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Show Me the Planets! NASA’s Search for Exoplanets and for Life in our Galaxy
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Show Me the Planets! NASA’s Search for Exoplanets and for Life in our Galaxy
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Optical interferometer testbed
Viewgraphs on optical interferometer testbed presented at the MIT Space Research Engineering Center 3rd Annual Symposium are included. Topics covered include: space-based optical interferometer; optical metrology; sensors and actuators; real time control hardware; controlled structures technology (CST) design methodology; identification for MIMO control; FEM/ID correlation for the naked truss; disturbance modeling; disturbance source implementation; structure design: passive damping; low authority control; active isolation of lightweight mirrors on flexible structures; open loop transfer function of mirror; and global/high authority control.
Experimental component mode synthesis of structures with sloppy joints
The accuracy of component mode synthesis is investigated experimentally for substructures coupled by nonideal joints. The work is based upon a segmented experimental beam for which free-interface frequency response matrices are measured for each segment. These measurements are used directly in component mode synthesis to predict the behavior of the assembled structure; the segments are then physically joined, and the resulting frequency response of the superstructure is compared to the prediction. Rotational freeplay is then introduced into the connecting joint, and the new superstructure frequency response is compared to the original linear component mode synthesis prediction. The level of accuracy to be expected in component mode synthesis is discussed in terms of the degree of nonlinearity in the joints, mode number, and mode shapes.