1,152 research outputs found
Anatomy of Invention
No full textBYU Studies has a long history of publishing the annual lecture given by the recipient of the Karl G. Maeser Distinguished Faculty Lecturer Award, BYU’s highest faculty honor. It is with great pleasure that BYU Studies Quarterly publishes this year’s lecture by Dr. Larry L. Howell, a professor of mechanical engineering. His speech was delivered as a forum address on May 17, 2016, at Brigham Young University
C-0657a: Smithfield, Utah, Abattoir owned by R. Larry Lower, (previously owned by Jack L. Reeder and Howell B. Reese, then Russell L. Lower). Sec 27 T13n R1E. 1945
No full textC-0657a: Smithfield, Utah, Abattoir owned by R. Larry Lower, (previously owned by Jack L. Reeder and Howell B. Reese, then Russell L. Lower). Sec 27 T13n R1E. 194
On the modeling of a contact-aided cross-axis flexural pivot
No full textThis paper reports the study of a planar Cross-Axis Flexural Pivot (CAFP) comprising an additional contact pair. The proposed device may be useful for applications requiring a revolute joint that behaves differently when deflecting clockwise/anti-clockwise. The presence of the contact pair reduces the free length of one flexures, resulting in a considerable increment of the overall joint stiffness. The pivot behaviour is investigated, for different load cases, via the Chained-Beam-Constraint Model (CBCM), namely an accurate method to be applied in large deflection problems. A framework comprising Matlab and ANSYS is developed for testing the CAFP performances in terms of rotational stiffness, parasitic shift and maximum stress, with different combinations of geometrical aspect ratios and contact extensions. Results achieved via CBCM for a pure rotation applied to the CAFP's output link are then verified through Finite Element Analysis. The resulting performance maps show good agreement between the numerical results. Furthermore, the CBCM shows an improved computational efficiency, which is a crucial aspect for preliminary design steps. At last, direct comparison between simulations and experiments, developed by means of two custom test rigs, confirms the efficacy of the proposed design method for the modeling of contacts in large deflection problems
Load-displacement characterization in three degrees-of-freedom for general lamina emergent torsion arrays
No full textLamina emergent torsion (LET) joints for use in origami-based applications enables folding of panels. Placing LET joints in series and parallel (formulating LET arrays) opens the design space to provide for tunable stiffness characteristics in other directions while maintaining the ability to fold. Analytical equations characterizing the elastic load-displacement for general serial-parallel formulations of LET arrays for three degrees-of-freedom are presented: rotation about the desired axis, in-plane rotation, and extension/compression. These equations enable the design of LET arrays for a variety of applications, including origami-based mechanisms. These general equations are verified using finite element analysis, and to show variability of the LET array design space, several verification plots over a range of parameters are provided
Heat Set Creases in Polyethylene Terephthalate (PET)Sheets to Enable Origami-Based Applications
No full textThis data set includes the raw data from the tests described in the research paper “Heat Set Creases in Polyethylene Terephthalate (PET) Sheets to Enable Origami-Based Applications” by Brandon Sargent, Nathan Brown, Brian D. Jensen, Spencer P. Magleby, William G. Pitt, and Larry L. Howell
Stetson Law Review
No full textThis article discusses the important elder law issues in the context of civil litigation and how many procedural rules affect the elderly directly. The author focuses on four main subject areas that affect the elderly the most: (1) Service and default; (2) Capacity related issues; (3) Preserving and giving testimony; and (4) compulsory physical or mental examinations. Within these four main areas, the author gives several hypotheticals from real court cases and relates them to the law of civil procedure and the first year class. The author ends by giving suggestions to first year professors of civil procedure on how to incorporate these rules in class, giving students an opportunity to better understand the relationship between civil litigation and elder law.41273-12923
Zero torque compliant mechanisms employing pre-buckled beams
No full textThe concept of a statically balanced mechanism with a single rotational degree-of-freedom is presented. The proposed device achieves static balancing by combining positive stiffness elements and negative stiffness elements within an annular domain. Two designs are discussed. The first is composed of an Archimedean spiral and two pinned-pinned pre-buckled beams. The overall mechanism is modeled via an analytical approach and the element dimensions are optimized. The optimal configuration is then tested through finite element analysis (FEA). A second approach replaces the spiral beam with elastic custom-shaped spline beams. A FEA optimization is performed to determine the shape and size of such spline beams. The behavior of the negators is used as reference for the optimization so as to achieve a complete balancing. A physical prototype of each configuration is machined and tested. The comparison between predicted and acquired data confirmed the efficacy of the design methods
Teaching and Learning in Honors
No full textIntroduction Rinda West A Review of the Research on Personality Characteristics of Academically Talented College Students Larry Clark Fundamental Issues In Honors Teaching: Data, Information, Knowledge, and Wisdom on the Wired Campus Larry Crockett Community Building In Honors Education Linda Rutland Gillison Teaching Critical Thinking In the Honors Classroom Laird Edman Cooperative Learning In Honors Education Cheryl L. Fuiks Honors Composition: Thoughts on Pedagogy Stewart Justman Promoting CriticaL Thinking Through Classroom Discussion William Taylor Using Technology In the Honors Classroom Larry Clark and Larry Crockett A Review of Pedagogy In Honors Courses Cheryl L. Fuiks and Linda Rutland Gillison Conclusions Laird Edman Index of Articles on Teaching and Learning In Honors Cheryl L. Fuiks About the Author
Free space optical system performance for a Gaussian beam propagating through non Kolmogorov weak turbulence
No full textAtmospheric turbulence has been described for many years by Kolmogorov's power spectral density model because of its simplicity. Unfortunately several experiments have been reported recently that show Kolmogorov theory is sometimes incomplete to describe atmospheric statistics properly, in particular in portions of the troposphere and stratosphere. It is known that free space laser system performance is limited by atmospheric turbulence. In this paper we use a non-Kolmogorov power spectrum which uses a generalized exponent instead of constant standard exponent value 11/3 and a generalized amplitude factor instead of constant value 0.033. Using this spectrum in weak turbulence, we carry out, for a Gaussian beam propagating along a horizontal path, analysis of long term beam spread, scintillation, probability of fade, mean signal to noise ratio and mean bit error rate as variation of the spectrum exponent. Our theoretical results show that for alpha values lower than 11/3 , but not for alpha close to 3 , there is a remarkable increase of scintillation and consequently a major penalty on the system performance. However when alpha assumes values close to 3 or for alpha values higher than 11/3 scintillation decreases leading to an improvement on the system performanc
Bloom Pattern Data
No full textThis data is the supplementary material of the paper Bloom Patterns: Radially Expansive, Developable, and Flat-Foldable Origami by Zhongyuan (Kelvin) Wang , Robert J. Lang, and Larry L. Howell.
We present bloom patterns as a family of radially expansive, flat-foldable, and developable origami patterns, many of which are rotationally symmetric. Bloom patterns are defined with a generalized definition and a standardized definition. A classification scheme for bloom patterns is identified, and several types of bloom patterns are analysed. The distinct helical nature that characterizes bloom patterns is described, and a set of compatibility conditions is derived to help determine if a valid bloom pattern can be constructed based on the standardized definition. At last, applications of bloom patterns are discussed.
Images of crease pattern diagrams, digital models, and paper prototypes of bloom patterns are used throughout the paper to explain and demonstrate the content. A catalog of bloom patterns further demonstrates the diversity and characteristics of bloom patterns. This includes the abovementioned image types as well as video clips of the folding process of paper prototypes and simulated models. Furthermore, a computer program is written to generate the crease pattern of Yoshimura bloom patterns based on the corresponding mathematical model in the paper. The catalog and the computer program constitute this data
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