Engineering topics
Wada, B.
Publications and source records attributed to Wada, B..
Static Shape Control of Inflatable Structures
Inflatable structural concepts have been proposed for numerous applications such as antennas for microwave remote sensing, space-based interferometry, solar concentrators, and for dual purposes (e.g. concentrator for power/antenna for communication). In comparison to other mechanically deployable systems, inflatable structures have significant advantages of a much lower cost, weight, and packaging volume, but higher deployment reliability and damping properties.
On-Orbit Shape Correction of Inflatable Structures
Piezo induced deformations are proposed as a means of achieving a higher degree of on-orbit surface accuracy of inflatable antennas.
Experiences in the Development of the Mighty Worm
The field of adaptive structures has expanded dramatically during the past few years. Inch worm actuators are commercially available, but do not meet all the desired static and dynamic features in one actuator. The objective of the development of the Mighty Worm was to develop such an actuator. The Mighty Work actuator consists of a piezoelectric transducer, its housing, and two clamping devices. In operation, Mighty Worm either pushes or pulls a load.
Experiences in the development of the Mighty Worm
A 'Mighty Worm' actuator with the active member capable of carrying large loads during the launch phase was developed for adaptive structures applications. Two types of Mighty Worm performance are characterized, namely, long-stroke motion and incremental positioning at 0, 25, 50, 75, and 100 lb. Long-stroke motion involves successive translations of all Mighty Worm moving elements, and incremental positioning involves only in-place stack expansion.
Dynamics of Large Precision Space Structures for Structural Control
This paper presents an overview of the challenges encountered in the prediction and ground test verification of structural dynamics for on-orbit control of large precision space structures.
Adaptive Space Structures
The term adaptive structures refers to a structural control approach in which sensors, actuators, electronics, materials, structures, structural concepts, and system-performance-validation strategies are integrated to achieve specific objectives.
Modal test/analysis correlation for the Centaur G prime launch vehicle
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Modal test/analysis correlation for Centaur G Prime launch vehicle
A modal test was performed on the Centaur G Prime launch vehicle for the purpose of verifying the loads analysis model. This paper describes the procedure by which modal parameters obtained in this test were correlated with the corresponding analytical predictions. Based on this correlation the stiffness model of the shuttle trunnion system has been modified. The evolution of the model updating and the final results are described.
Strain gaged struts and data reduction techniques to maximize quality data from spacecraft flight measurements
The flight instrumentation for the Viking project was established to obtain environmental data, and maximize the data obtainable from the limited number of telemetry channels. To achieve these objectives, a set of six struts were strain gaged and calibrated as load cells to obtain a complete force-time history across an interface. The force-time history can be used with an analytical model to calculate the response of any part of the structure above the instrumented interface. Special matched filters were required to reduce the flight data and derive the phase correlated loads. Flight data results from the Viking Dynamic Simulator flown in February 1974 are described in addition to ground test results used to verify the data reduction process.
Stiffness matrix structural analysis
Computer program for stiffness of structure with lumped masses, weightless members, and many degrees of freedom - structural dynamics