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Articles 1 - 27 of 27
Full-Text Articles in Mechanical Engineering
A Study On The Student Success In A Blended-Model Engineering Classroom, Vimal Viswanathan, John Solomon
A Study On The Student Success In A Blended-Model Engineering Classroom, Vimal Viswanathan, John Solomon
Faculty Publications, Mechanical Engineering
One of the primary concern that many engineering educators face is the lack of engagement of students in their classroom. While literature suggests a variety of factors that might negatively influence student engagement, the theory of “Tailored Instructions and Engineered Delivery Using Protocols” (TIED UP) specifically addresses the lack of engagement arising from a weak pre-requisite base. TIED UP is a blended teaching model where the content delivery follows a set of protocols inspired by the brain-based learning approach. In a typical TIED UP classroom, content delivery is performed using short, animated and scripted concept videos that are generated before …
Application Of Brain-Based Learning Principles To Engineering Mechanics Education: Implementation And Preliminary Analysis Of Connections Between Employed Strategies And Improved Student Engagement, Firas Akasheh, John Solomon, Eric Hamilton, Chitra Nayak, Vimal Viswanathan
Application Of Brain-Based Learning Principles To Engineering Mechanics Education: Implementation And Preliminary Analysis Of Connections Between Employed Strategies And Improved Student Engagement, Firas Akasheh, John Solomon, Eric Hamilton, Chitra Nayak, Vimal Viswanathan
Faculty Publications, Mechanical Engineering
In a pilot study supported by NSF, an instructional model that uses brain based learning principles as instructional protocols has been developed and successfully implemented in the course Introduction to Fluid Mechanics at a HBCU. Motivated by that success, we extended a similar intervention to another course, Dynamics, in the same school. In this paper, we report preliminary data from this intervention. The main strategies implemented in this intervention include: organization of the course into specific concepts and sub-concepts, which are concisely presented by short (limited to 2-6 minutes) content-rich lectures (diagrams, animations, narrations), active learning through in-class worksheets, and …
Fabricating Zirconia Parts With Organic Support Material By The Ceramic On-Demand Extrusion Process, Wenbin Li, Amir Ghazanfari, Devin Mcmillen, Andrew Scherff, Ming Leu, Gregory Hilmas
Fabricating Zirconia Parts With Organic Support Material By The Ceramic On-Demand Extrusion Process, Wenbin Li, Amir Ghazanfari, Devin Mcmillen, Andrew Scherff, Ming Leu, Gregory Hilmas
Faculty Publications, Mechanical Engineering
Ceramic On-Demand Extrusion (CODE) is an extrusion-based additive manufacturing process recently developed for fabricating dense, functional ceramic components. This paper presents a further development of this process and focuses on fabricating 3 mol% yttria-stabilized zirconia (3YSZ) components that cannot be fabricated without using support structures. The 3YSZ paste is deposited through the main nozzle, and a polycaprolactone (PCL) pellet feedstock is melted and deposited through an auxiliary nozzle to build support structures. After a green part is printed and dried, the support structures are removed by heating the part to ~70°C to melt the PCL. The part is then sintered …
Design Prototyping Methods: State Of The Art In Strategies, Techniques, And Guidelines, Bradley Camburn, Vimal Viswanathan, Julie Linsey, David Anderson, Daniel Jensen, Richard Crawford, Kevin Otto, Kristin Wood
Design Prototyping Methods: State Of The Art In Strategies, Techniques, And Guidelines, Bradley Camburn, Vimal Viswanathan, Julie Linsey, David Anderson, Daniel Jensen, Richard Crawford, Kevin Otto, Kristin Wood
Faculty Publications, Mechanical Engineering
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 …
Mechanical Characterization Of Parts Produced By Ceramic On‐Demand Extrusion Process, Amir Ghazanfari, Wenbin Li, Ming Leu, Gregory Hilmas
Mechanical Characterization Of Parts Produced By Ceramic On‐Demand Extrusion Process, Amir Ghazanfari, Wenbin Li, Ming Leu, Gregory Hilmas
Faculty Publications, Mechanical Engineering
Ceramic On‐Demand Extrusion (CODE) is an additive manufacturing process recently developed to produce dense three‐dimensional ceramic components. In this paper, the properties of parts produced using this freeform extrusion fabrication process are described. High solids loading (~60 vol%) alumina paste was prepared to fabricate parts and standard test methods were employed to examine their properties including the density, strength, Young's modulus, Weibull modulus, toughness, and hardness. Microstructural evaluation was also performed to measure the grain size and critical flaw size. The results indicate that the properties of parts surpass most other ceramic additive manufacturing processes and match conventional fabrication techniques.
Maker: Redesign Of A Multipurpose Hardware Tool To Improve Its Functionality And Marketability, David Alexander, Vimal Viswanathan, Shraddha Sangelkar, Johnathan Moody
Maker: Redesign Of A Multipurpose Hardware Tool To Improve Its Functionality And Marketability, David Alexander, Vimal Viswanathan, Shraddha Sangelkar, Johnathan Moody
Faculty Publications, Mechanical Engineering
In this maker project, we redesigned a hardware tool that is primarily used by linemen working in power companies. At the top of the posts where they work, it is essential to have easily accessible and easy-to-use tools with firm grip. With the use of a multi-purpose product that combines the functionalities of many other common tools, the handling of the tools can be made easy. This maker project is conducted as a case study for a larger research study where the investigators developed a new set of guidelines for the development of multi-purpose products. Though multi-purpose products are very …
A Study On The Effects Of Example Familiarity And Modality On Design Fixation, Vimal Viswanathan, Megan Tomko, Julie Linsey
A Study On The Effects Of Example Familiarity And Modality On Design Fixation, Vimal Viswanathan, Megan Tomko, Julie Linsey
Faculty Publications, Mechanical Engineering
Design fixation is a factor that negatively influences the generation of novel design concepts (Jansson & Smith, 1991). When designers fixate, they tend to reproduce example features or features from their initial ideas. In order to mitigate design fixation, it is crucial to identify the factors that influence the extent of design fixation. This paper investigates two such factors: the modality of examples and the familiarity of designers with the example features. To investigate this, an experiment is conducted with mechanical engineering students who were asked to generate ideas to solve a peanut sheller design problem. The students generated ideas …
A Novel Extrusion-Based Additive Manufacturing Process For Ceramic Parts, Amir Ghazanfari, Wenbin Li, Ming Leu, Gregory Hilmas
A Novel Extrusion-Based Additive Manufacturing Process For Ceramic Parts, Amir Ghazanfari, Wenbin Li, Ming Leu, Gregory Hilmas
Faculty Publications, Mechanical Engineering
An extrusion-based additive manufacturing process, called the Ceramic On-Demand Extrusion (CODE) process, for producing three-dimensional ceramic components with near theoretical density is introduced in this paper. In this process, an aqueous paste of ceramic particles with a very low binder content (<1 vol%) is extruded through a moving nozzle at room temperature. After a layer is deposited, it is surrounded by oil (to a level just below the top surface of most recent layer) to preclude non-uniform evaporation from the sides. Infrared radiation is then used to partially, and uniformly, dry the just-deposited layer so that the yield stress of the paste increases and the part maintains its shape. The same procedure is repeated for every layer until part fabrication is completed. Several sample parts for various applications were produced using this process and their properties were obtained. The results indicate that the proposed method enables fabrication of large, dense ceramic parts with complex geometries.
Properties Of Partially Stabilized Zirconia Components Fabricated By The Ceramic On-Demand Extrusion Process, Wenbin Li, Amir Ghazanfari, Devin Mcmillen, Ming Leu, Gregory Hilmas, Jeremy Watts
Properties Of Partially Stabilized Zirconia Components Fabricated By The Ceramic On-Demand Extrusion Process, Wenbin Li, Amir Ghazanfari, Devin Mcmillen, Ming Leu, Gregory Hilmas, Jeremy Watts
Faculty Publications, Mechanical Engineering
The Ceramic On-Demand Extrusion (CODE) process is a novel additive manufacturing process for fabricating dense ceramic components from aqueous pastes of high solids loading. In this study, 3 mol% Y2O3 stabilized tetragonal zirconia polycrystal (3Y-TZP) parts were fabricated using the CODE process. The parts were then dried in a humidity controlled environmental chamber and sintered under atmospheric pressure. Mechanical properties of the sintered parts were examined using ASTM standard test techniques, including density, Young’s modulus, flexural strength, Weibull modulus, fracture toughness and Vickers hardness. The microstructure was analyzed, and grain size was measured using scanning electron microscopy. The results compared …
Improving Student Learning Experience In An Engineering Graphics Classroom Through A Rapid Feedback And Re-Submission Cycle., Vimal Viswanathan, Maria Charlton
Improving Student Learning Experience In An Engineering Graphics Classroom Through A Rapid Feedback And Re-Submission Cycle., Vimal Viswanathan, Maria Charlton
Faculty Publications, Mechanical Engineering
Improving Student Learning Experience in an Engineering Graphics Classroom through the Mastery Approach Pictorial representation of three-dimensional objects has been one of the oldest forms of communication. Engineering graphics courses deal with the art of documenting three dimensional objects in two-dimensional format. Prior literature shows that graphics communication is a key skill for an engineer to possess. However, students in engineering graphics classrooms struggle to understand the concepts being taught due to a variety of reasons including poor visualization skills, limited class time, huge class sizes and unavailability of simple demonstrations. Most of the schools offer this course in the …
Methods Of Extrusion On Demand For High Solids Loading Ceramic Paste In Freeform Extrusion Fabrication, Wenbin Li, Amir Ghazanfari, Ming Leu, Robert Landers
Methods Of Extrusion On Demand For High Solids Loading Ceramic Paste In Freeform Extrusion Fabrication, Wenbin Li, Amir Ghazanfari, Ming Leu, Robert Landers
Faculty Publications, Mechanical Engineering
Fabrication of highly dense parts with complex geometry by paste-extrusion-based solid freeform fabrication processes requires a precise control of the extrusion flow rate to dispense material on demand, which is often referred as Extrusion-On-Demand (EOD). The extrusion process for aqueous ceramic pastes is complex and difficult to control due to their non-Newtonian behavior, compressibility and inhomogeneity. In this study, three methods of EOD (based on ram extruder, needle valve, and auger valve) are introduced and investigated for the extrusion of high solids loading (i.e., >50%, volumetric) aqueous alumina paste. Optimal extrusion process parameters for these methods are determined through printing …
Optimal Rastering Orientation In Freeform Extrusion Fabrication Processes, Amir Ghazanfari, Wenbin Li, Ming Leu, Robert Landers
Optimal Rastering Orientation In Freeform Extrusion Fabrication Processes, Amir Ghazanfari, Wenbin Li, Ming Leu, Robert Landers
Faculty Publications, Mechanical Engineering
Many researchers have tried to optimize the build direction of additively manufactured parts to minimize the vertical staircase effect. However, the horizontal staircase effect should also be considered when fully dense parts are to be fabricated. In this paper, part inaccuracy due to the horizontal staircase effect is considered in order to determine the optimal rastering orientation in building the part. An algorithm is developed to estimate this inaccuracy and a technique is proposed to minimize it. The effect of rastering orientation on staircase errors is examined, and the particle swarm optimization method is used to determine the optimum rastering …
Planning Freeform Extrusion Fabrication Processes With Consideration Of Horizontal Staircase Effect, Amir Ghazanfari, Wenbin Li, Ming Leu, Robert Landers
Planning Freeform Extrusion Fabrication Processes With Consideration Of Horizontal Staircase Effect, Amir Ghazanfari, Wenbin Li, Ming Leu, Robert Landers
Faculty Publications, Mechanical Engineering
An algorithm has been developed to estimate the “horizontal” staircase effect and a technique is proposed to reduce this type of geometrical error for freeform extrusion fabrication processes of 3D “solid” parts. The adaptive rastering technique, proposed in this paper, analyzes the geometry of each layer and changes the width of each line of the raster adaptively in order to reduce the staircase error and increase the productivity simultaneously. For each line, the maximum width that results in a staircase error smaller than a predefined threshold is determined for decreasing the fabrication time or increasing the dimensional accuracy, or both. …
Spanning The Complexity Chasm: A Research Approach To Move From Simple To Complex Engineering Systems, Vimal Viswanathan, Julie Linsey
Spanning The Complexity Chasm: A Research Approach To Move From Simple To Complex Engineering Systems, Vimal Viswanathan, Julie Linsey
Faculty Publications, Mechanical Engineering
A multistudy approach is presented that allows design thinking of complex systems to be studied by triangulating causal controlled lab findings with coded data from more complex products. A case study illustration of this approach is provided. During the conceptual design of engineering systems, designers face many cognitive challenges, including design fixation, errors in their mental models, and the sunk cost effect. These factors need to be mitigated for the generation of effective ideas. Understanding the effects of these challenges in a realistic and complex engineering system is especially difficult due to a variety of factors influencing the results. Studying …
A Study On The Factors Influencing The Usage Of Environmentally Friendly Products, Nicole Esposito, Vimal Viswanathan, Julie Linsey
A Study On The Factors Influencing The Usage Of Environmentally Friendly Products, Nicole Esposito, Vimal Viswanathan, Julie Linsey
Faculty Publications, Mechanical Engineering
Benchmarking in Design Projects: Lessons Learned from a Sophomore Design Course This paper presents some of the lessons learned from a sophomore design course offered at one of the major universities in the United States. This course is developed to provide realistic design, machining and mechatronics experiences to mechanical engineering sophomores. As apart of this course, the students are required to generate ideas for solving a real-life design problem. The objective of this study is to identify the influences of benchmarking products on the final concepts generated by student designers. Literature shows that designers, while solving open-ended design problems, tend …
A Study On The Role Of Physical Models In The Mitigation Of Design Fixation, Vimal Viswanathan, Olufunmilola Atilola, Nicole Esposito, Julie Linsey
A Study On The Role Of Physical Models In The Mitigation Of Design Fixation, Vimal Viswanathan, Olufunmilola Atilola, Nicole Esposito, Julie Linsey
Faculty Publications, Mechanical Engineering
Designers implement a variety of models and representations during the design process, yet little is known about the cognitive impacts of various representations. This study focuses on how physical models can assist novices in mitigating design fixation on undesirable features. During idea generation, designers tend to fixate on examples they encounter or on their own initial ideas. The first hypothesis states that designers tend to duplicate features of provided examples. The second hypothesis states that this fixation can be mitigated with appropriate warnings. The last hypothesis is that building and testing physical models can help designers in mitigating fixation. To …
Loading Path Determination For Tube Hydroforming Process Of Automotive Component Using Apdl, E. Masoumi Khalil Abad, Amir Ghazanfari, R. Hashemi
Loading Path Determination For Tube Hydroforming Process Of Automotive Component Using Apdl, E. Masoumi Khalil Abad, Amir Ghazanfari, R. Hashemi
Faculty Publications, Mechanical Engineering
In this study, an extended stress-based forming limit diagram (FLD) for prediction of necking based on the Marciniak and Kucznski (M-K) model is represented and applied in tube hydroforming. The bulge forming of a straight tube is simulated by finite element method and verified with published experimental data. This adaptive simulation technique is based on the ability to detect the onset and growth of defects (e.g., bursting and wrinkling) and to promptly readjust the loading paths. Thus, a suitable load path is determined by applying Adaptive Simulation Method in ANSYS Parametric Design Language (APDL).
Connecting Design Problem Characteristics To Prototyping Choices To Form A Prototyping Strategy, Bradley Camburn, Brock Dunlap, Vimal Viswanathan, Julie Linsey, Daniel Jensen, Richard Crawford, Kevin Otto, Kristin Wood
Connecting Design Problem Characteristics To Prototyping Choices To Form A Prototyping Strategy, Bradley Camburn, Brock Dunlap, Vimal Viswanathan, Julie Linsey, Daniel Jensen, Richard Crawford, Kevin Otto, Kristin Wood
Faculty Publications, Mechanical Engineering
Connecting Design Problem Characteristics to Prototyping Choices to Form a Prototyping Strategy Abstract Prototyping is a critical part of the product design process with the potential to play a significant role in determining the success or failure of the product. A variety of decisions are made by the design team when determining the manner in which they will develop prototypes. Example decisions include: choosing to develop either multiple prototypes or only a single prototype; and choosing to develop either a scaled or fully functional prototype. We define a prototyping strategy as the compilation of all the decisions that need to …
Training Future Designers: A Study On The Role Of Physical Models, Vimal Viswanathan, Julie Linsey
Training Future Designers: A Study On The Role Of Physical Models, Vimal Viswanathan, Julie Linsey
Faculty Publications, Mechanical Engineering
Physical Models in Engineering Education: Making Tomorrow’s Designers Creative Innovation and creativity are two essential qualities for tomorrow’s designers. In order to nurture these skills in designers, our engineering curricula need to include more hands-on training. In recent times, many engineering educators have recognized the importance of hands-on training in engineering curriculum. Allowing students to build and test their own physical models and learn from their mistakes can be a very effective way of teaching. Recent studies have shown that physical models play a very important role in design innovation and creativity. Building and testing such models can lead designers …
Examining Design Fixation In Engineering Idea Generation: The Role Of Example Modality, Vimal Viswanathan, Julie Linsey
Examining Design Fixation In Engineering Idea Generation: The Role Of Example Modality, Vimal Viswanathan, Julie Linsey
Faculty Publications, Mechanical Engineering
Design fixation is a major concern in engineering idea generation because it restricts the solution space in which designers search for their ideas. For designers to be more creative, it is essential to mitigate their fixation. The majority of studies in the literature investigate the role of pictorial stimuli in design fixation; however, the role of examples presented in other formats, including physical prototypes, is largely unknown. This paper presents a study that compares design fixation, in novice designers, caused by pictorial and physical representations. The effects of defixating materials proposed by Linsey et al. (2010) are also investigated. The …
Training Tomorrow’S Designers: A Study On The Design Fixation, Vimal Viswanathan, Nicole Esposito, Julie Linsey
Training Tomorrow’S Designers: A Study On The Design Fixation, Vimal Viswanathan, Nicole Esposito, Julie Linsey
Faculty Publications, Mechanical Engineering
Training Tomorrow’s Designers: A Study on the Design Fixation Training engineering students for being tomorrow’s efficient designers has been an area of concern in recent times. The ability to come up with novel and functional solutions to design problems is an essential skill for a good designer. Researchers have identified many factors that affect the generation of novel ideas. The presence of rich pictorial stimuli around designers is one such factor. Designers tend to duplicate features from the examples they encounter in their immediate surroundings or in their day-to-day activities. This adhesion to the existing features from their surroundings is …
Build To Learn: Effective Strategies To Train Tomorrow’S Designers, Vimal Viswanathan, Julie Linsey
Build To Learn: Effective Strategies To Train Tomorrow’S Designers, Vimal Viswanathan, Julie Linsey
Faculty Publications, Mechanical Engineering
Build to Learn: Effective Strategies to Train Tomorrow’s Designers use various representations to externalize their ideas, physical models being an important one. Engineering students need physical models are widely used by designers and their use is promoted as an effective design tool by industry and government agencies. However, very little is known about the cognitive effects of physical models in the design process. The available guidelines are conflicting. Some researchers argue for the frequent implementation of physical models; others observe that the use of physical models fixates designers. In light of these conflicts, this research project focuses on understanding the …
Innovation Skills For Tomorrow’S Sustainable Designers, Julie Linsey, Vimal Viswanathan
Innovation Skills For Tomorrow’S Sustainable Designers, Julie Linsey, Vimal Viswanathan
Faculty Publications, Mechanical Engineering
Tomorrow’s sustainable designers will need an arsenal of tools for innovation. An approach for teaching design methods and innovation is described. A new approach for teaching design methods based on the use of analogous products to provide concrete experiences prior to the method’s application to a novel design problem was evaluated. Students’ opinions of the various design methods and their perceptions of the class’s influence on their creativity were also measured. Past experiments have shown that the presentation of example solutions has the potential to cause design fixation thus limiting the design solutions considered. Due to this, the teams’ final …
Battery-Operated Atomic Force Microscope, Burford J. Furman, J. Christman, M. Kearny, F. Wojcik, M. Tortonese
Battery-Operated Atomic Force Microscope, Burford J. Furman, J. Christman, M. Kearny, F. Wojcik, M. Tortonese
Faculty Publications, Mechanical Engineering
The design of a battery-operated atomic force microscope (AFM) using a piezoresistive cantilever is described. The AFM is designed so that all power to drive the scanning tube and detection electronics comes from a self-contained battery. The prototype AFM uses a 6 V, Ni–Cd, camcorder battery, however, any battery that supplies between 6 and 12 V may be used. Scanner control and data acquisition are implemented using commercially available software running on an external computer. The prototype AFM achieves a scan area of 53 by 53 μm, consumes 1.8 W of power, and can scan continuously for about 7 h …
Mechatronics Engineering Laboratory Development At San Jose State University, J. Wang, Burford Furman, T. Hsu, P. Hsu, P. Reischl, Freidoon Barez
Mechatronics Engineering Laboratory Development At San Jose State University, J. Wang, Burford Furman, T. Hsu, P. Hsu, P. Reischl, Freidoon Barez
Faculty Publications, Mechanical Engineering
The Mechanical Engineering Department of San Jose State University has been developing a new mechatronics engineering laboratory since Fall 1995. This laboratory is intended to provide engineering students on the application of electronics, microprocessors and software in designing electro-mechanical systems, mechatronics products and process control systems. The laboratory development is a principal part of an award for “Undergraduate Curriculum Development on Mechatronics System Engineering” by the division of undergraduate education of the National Science Foundation (NSF). Major task of the new laboratory is to support instruction and provide hands-on study of two of the five new courses: ME106 Fundamentals of …
Laboratory Development For Mechatronics Education, Burford Furman, T. Hsu, Freidoon Barez, A. Tesfaye, J. Wang, P. Hsu, P. Reischl
Laboratory Development For Mechatronics Education, Burford Furman, T. Hsu, Freidoon Barez, A. Tesfaye, J. Wang, P. Hsu, P. Reischl
Faculty Publications, Mechanical Engineering
This paper presents the strategy for developing the “Mechatronic Engineering Laboratory” at the authors’ university. The laboratory development was a principal part of an award for “Undergraduate Curriculum Development on Mechatronic Systems Engineering” by the Division of Undergraduate Education of the National Science Foundation (NSF). Major tasks involved in the award include the development and implementation of five new courses and a new laboratory. The purpose of the new laboratory is to support instruction of two of the five new courses: ME 105 Fundamentals of Mechatronic Systems Engineering and ME 190 Electromechanical Systems and Microprocessor Applications.
An Improved Rotary Singulator, Burford J. Furman, J. M. Henderson
An Improved Rotary Singulator, Burford J. Furman, J. M. Henderson
Faculty Publications, Mechanical Engineering
A new operating approach for a previously existing rotary singulator was developed which improves the versatility of the device. This was accomplished by the implementation of a modular mechanism that performed the basic functions of agitation, gating, pocket formation, and exit, all inherent in this type of singulation device.