Papers by Richard Crawford
Understanding student use of epistemic criteria in engineering design contexts
Science Education
2012 ASEE Annual Conference & Exposition Proceedings
His research includes design of Micro Air Vehicles, development of innovative design methodologie... more His research includes design of Micro Air Vehicles, development of innovative design methodologies and enhancement of engineering education. Jensen has authored approximately 100 papers and has been awarded more than $2.5 million of research grants.
2012 ASEE Annual Conference & Exposition Proceedings
His research includes design of micro air vehicles, development of innovative design methodologie... more His research includes design of micro air vehicles, development of innovative design methodologies, and enhancement of engineering education. Jensen has authored approximately 100 papers and has been awarded more $2.5 million of research grants.
2013 ASEE Annual Conference & Exposition Proceedings
earned his B.S. in mechanical engineering from Villanova University and his M.S. and Ph.D. in mec... more earned his B.S. in mechanical engineering from Villanova University and his M.S. and Ph.D. in mechanical engineering from North Carolina State University. He has been a faculty member at the University of the Pacific since 2003 and has taught undergraduate courses in thermodynamics, heat transfer, combustion, airconditioning , dynamics, and senior capstone design.
Journal of Pre-College Engineering Education Research (J-PEER), 2019
The goal of this study was to examine how the use of a new instructional model is related to chan... more The goal of this study was to examine how the use of a new instructional model is related to changes in middle school students' engineering identity. The intent of this instructional model, which is called argument-driven engineering (ADE), is to give students opportunities to design and critique solutions to meaningful problems using the core ideas and practices of science and engineering. The model also reflects current recommendations found in the literature for supporting the development or maintenance of engineering identity. This study took place in the context of an eighth-grade science classroom in order to explore how middle school students' engineering identities change over time as they become more familiar with engineering core ideas and practices. One hundred students participated in this study. These students completed three design tasks during the school year that were created using the ADE instructional model. These students also completed a survey that was designed to measure two important aspects of an engineering identity (recognition and interest) at three different time points. The results of a hierarchical linear modeling analysis suggest that students' ideas about how they view themselves and others view them in terms of engineering did not change over time and their reported interest decreased from one survey to the next. The difficulty of the design tasks and the ways teachers enacted the instructional model are proposed as potential explanations for this counterintuitive finding.
Design Science, 2017
Prototyping is interwoven with nearly all product, service, and systems development efforts. A pr... more Prototyping is interwoven with nearly all product, service, and systems development efforts. A prototype is a pre-production representation of some aspect of a concept or final design. Prototyping often predetermines a large portion of resource deployment in development and influences design project success. This review surveys literature sources in engineering, management, design science, and architecture. The study is focused around design prototyping for early stage design. Insights are synthesized from critical review of the literature: key objectives of prototyping, critical review of major techniques, relationships between techniques, and a strategy matrix to connect objectives to techniques. The review is supported with exemplar prototypes provided from industrial design efforts. Techniques are roughly categorized into those that improve the outcomes of prototyping directly, and those that enable prototyping through lowering of cost and time. Compact descriptions of each tech...
The combination of direct-write techniques with the deposition of sol-gel films has the opportuni... more The combination of direct-write techniques with the deposition of sol-gel films has the opportunity of creating low-cost optical components. Recent advancements in both fields suggest the possibility of fabricating novel components for rapid prototyping purposes. This paper presents continuing work in the integration of these two concepts for the development of a novel manufacturing process. The results concentrate on laser processing stage, as well as on the optical characterization of simple waveguides.
Volume 3: 38th Design Automation Conference, Parts A and B, 2012
Many natural systems that transport heat, energy or fluid from a distributed volume to a single f... more Many natural systems that transport heat, energy or fluid from a distributed volume to a single flow channel exhibit an analogous appearance to trees (examples include bronchial tubes, watersheds, lightening, and blood vessels). Several authors have proceeded with analytical methods to develop fractal or pseudo-fractal designs analogous to these natural instances. This implicates an implicit belief in some designers that there is an optimal attribute to this 'tree-like' appearance. A novel explanation for the appearance of these systems is presented in this paper. Natural systems follow the path of least resistance; or in other words, minimize transport effort. Effort is required to overcome all forms of friction (an unavoidable consequence of motion). Therefore effort minimization is analogous to transport distance (path length) minimization. Effort due to friction will be integrated over the total transport distance. Leveraging this observation a simple, geometric explanation for the emergent 'tree-like' architecture of many natural systems is now achievable. Note that this 'tree' effect occurs when most of the flow volume exhibits diffusion, with a small percentage of interdigitated high flow velocity channels. One notable application of our novel method, path length analysis, is the automated creation of cooling channel networks for heat generating micro-chips. As a demonstration, this path length analysis method was used to develop a significantly more efficient channel configuration (by 14%) than the state of the art for conductive microchip cooling. An extensive array of finite element models confirms the performance of this novel configuration.
Many natural systems that transport heat, energy or fluid from a distributed volume to a single f...
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Papers by Richard Crawford