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710 results on '"Howell, Larry L."'

10. Unpacking the Mathematics of Modeling Origami Folding Transformations with Quaternions

Author

Broyles, Zachary, Talbot, Spencer, Johnson, Jacob, Halverson, Denise M., Howell, Larry L., Ceccarelli, Marco, Series Editor, Hernandez, Alfonso, Editorial Board Member, Huang, Tian, Editorial Board Member, Takeda, Yukio, Editorial Board Member, Corves, Burkhard, Editorial Board Member, Agrawal, Sunil, Editorial Board Member, Larochelle, Pierre, editor, and McCarthy, J. Michael, editor

Published
2020
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11. Using Cyclic Quadrilaterals to Design Cylindrical Developable Mechanisms

Author

Hyatt, Lance P., Greenwood, Jacob R., Butler, Jared J., Magleby, Spencer P., Howell, Larry L., Ceccarelli, Marco, Series Editor, Hernandez, Alfonso, Editorial Board Member, Huang, Tian, Editorial Board Member, Takeda, Yukio, Editorial Board Member, Corves, Burkhard, Editorial Board Member, Agrawal, Sunil, Editorial Board Member, Larochelle, Pierre, editor, and McCarthy, J. Michael, editor

Published
2020
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24. Ultra-Compact Orthoplanar Spring via Euler-Spiral Flexures.

Author

Sutton, Jacob, Ynchausti, Collin, Dahl, Kyle, Magleby, Spencer P., Howell, Larry L., and Jensen, Brian D.

Subjects
FLEXURE, COMPLIANT mechanisms, ARC length, ANTENNAS (Electronics)
Abstract

Orthoplanar springs are single-component compliant mechanisms that can be fabricated from sheet material and undergo deflection orthogonal to the plane of the mechanism. They are useful in applications where spatial constraints are significant. An Euler spiral is a curve whose curvature is linearly proportional to the arc length allowing for the curve to assume a flat position under a load. In this work, orthoplanar spring and Euler-spiral concepts are synthesized to create a single-component spring mechanism that lies flat under a load. Where traditional planar springs under a load will take on an out-of-plane contour, the Euler-spiral orthoplanar spring lies completely flat under a load. The relationship between the load needed to flatten the orthoplanar Euler-spiral spring and its physical geometry is examined. A use case where the Euler-spiral orthoplanar spring is utilized as a deployment mechanism for a mid-flight emerging antenna on the surface of a flight body is presented. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Preliminary Exploration of Approaches to Increase the Stability of Flat-Foldable Origami-Adapted Designs in the Open, Flat State

Author

Ynchausti, Collin, Shirley, Spencer, and Howell, Larry L.

Subjects
Engineering, Physical Sciences and Mathematics
Abstract

Deployable spacecraft-based systems are benefitted from origami-adapted systems because they can be folded compactly and then deployed to larger areas. This unfolding motion must be stopped and held in specific configurations. In the case of reflectarrays, the panels need to deployed to flat and be kept there. Strain energy can be utilized to stabilize these systems. This works shows three ways, based on three different thickness accommodation techniques, that strain energy may be used to stabilize the systems in their deployed, flat positions. Additionally, each technique shown creates co-planar top surfaces to benefit reflectarray antenna design cases.

Published
2023

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