9,645 research outputs found
Simulation-driven parameter study of concentric Halbach cylinders for magnetorheological robotic grasping
No full textDue to their peculiar property of controlled stiffness and strength under an external magnetic field, magnetorheological (MR) fluids show great potential in developing hybrid robotic grippers that in the future could offer the same versatility as the human hand. This demands for suffciently strong, compact and switchable magnetic field sources for which permanent magnets are often overshadowed by electromagnets. However, permanent magnets possess higher magnetic flux densities per mass unit, and when assembled in certain ways, they allow to control their joint magnetic field. Within this paper, an extensive parameter study is conducted using grid search for the design of concentric Halbach cylinder assemblies based on finite element simulations. The influence of decisive geometric and material properties on the performance of these magnetic activation mechanisms is studied. These include the magnets’ shapes, sizes and number; the cylinders’ radii and number of pole pairs; and the relative permeabilities of the MR fluid and the grasped object. The performance of a design is measured by a multi-objective function that considers: the mean magnetic flux densities generated in the mechanism’s ON and OFF-state, the magnetic field’s inhomogeneity (i.e. standard deviation) in the ON-state, and the total magnet area for both cylinders. This work concludes by deriving guidelines for the most optimal design of concentric Halbach cylinders for a cylindrical radial bellow gripper.sponsorship: Jeroen Cramer thanks KU Leuven, Diepenbeek Campus for granting a FLOF mandate therewith facilitating this research. Martijn Cramer is a SB PhD fellow at FWO (Research Foundation Flanders) under grant
agreement 1SA6919N. (Fonds Wetenschappelijk Onderzoek|1SA6919N)status: Published onlin
Orin Cramer
No full textOrin Cramer is pictured his sophomore year at Uintah High School. He is the son of Eric A. and Magdelen Cramer
ROSENTHAL, Eric Inventory of documents
No full textCOVERAGE 1904; 1 File; 011 metre.Private papers of Eric Rosenthal, author, journalist and broadcaster
tritrophic-dispersal-model: Code used for creating figures for "Non-hierarchical dispersal promotes stability and resilience in a tri-trophic metacommunity"
No full text<p>This is the commented code used for creating figures for the paper. Any questions regarding the code should be directed to the corresponding author and repository owner (Eric Pedersen). </p>
Eric Velazquez Spanish Language Picture Book Award 2022 Acceptance Speech
No full textAuthor Eric Velazquez gives his Silver Medal acceptance speech for Pulpo Guisado (Holiday House)https://educate.bankstreet.edu/spanishlanguageaward/1001/thumbnail.jp
Eric C. Lincoln, Professor of Sociology and Religion, 1971
No full textThis is an interview with Eric C. Lincoln. Eric was a Professor of Sociology and religion, Union Theological Seminary and author of many books and articles on Negro history. In this recording the contributors discuss local memphis politics, sociology, and race relations compared to that of other cities in the South and the rest of the country
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