Engineering Design Graphic Journal (ASEE - American Society for Engineering Education)
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Continuing Evolution of a Web-based Engineering Graphics Tutorial: Interactive Input and Response
Get PDFThis paper explains the ongoing evolution and advances made with a computer-based tutorial, including the incorporation of an interactive input and response capability that allows the user to develop multiview drawings and receive details, real-time feedback as part of the tutorial function. A review of the original purpose and pedagogy of the tutorial project are included, as well as future plans for the tutorial and related efforts. Formal experimental plans, procedures, and results validating the tutorial's effectiveness will be presented and discussed
Defining Expertise in the Use of Constraint-based CAD Tools by Examining Practicing Professionals
Get PDFAcademic engineering graphics curricula are facing a rapidly changing knowledge base and current teaching and assessment methods are struggling to keep pace. This paper is the second in a two-part series which examines practicing engineering graphics professionals to discover their experiences in developing expertise in the use of constraint-based CAD tools. It presents the results of a knowledge-mapping task and think-aloud modeling task used with five practicing product designers to examine their solid modeling strategies used when creating a 3D model and their organization of the concepts surrounding the knowledge domain of constraint-based CAD tools. The results of the think-aloud modeling task yielded five specific modeling procedures which were distilled into one common modeling procedure for the given object. The results of the knowledge mapping task revealed five separate knowledge maps, and the common elements from each one were combined to form a generic knowledge map related to the use of constraint-based CAD tools. These two sets of results comprised the initial elements used to define expertise in the use of constraint-based CAD tools based on these five participants. This article provides an initial look at an approach to creating geometry with constraint-based CAD tools, as well as specific topics to be included in a curriculum that includes constraint-based CAD tools. There conclusions also suggest potential teaching and assessment methodologies
Spatial Visualization by Realistic 3D Views
Get PDFIn this study, the popular Purdue Spatial Visualization Test – Visualization by Rotations (PSVT-R) in isometric drawings was recreated with CAD software that allows 3D solid modeling and rendering to provide more realistic pictorial views. Both the original and the modified PSVT-R tests were given to students and their scores on the two tests were compared to investigate whether there was improvement in performance on spatial visualization tests with realistic 3D views. The study involved 157 first year community college students in engineering and technology majors and 34 high school seniors from a technical careers high school, all of whom were taking an engineering graphics course or a CAD course at the college when taking the tests. The test scores were analyzed in four groups: graphics classes, CAD classes, high school students, and a comparison group. In all four groups, the mean scores of the realistic 3D test were higher than the mean scores of the isometric test, which shows enhanced performance on the spatial visualization test with realistic 3D views
Cam Design Projects in an Advanced CAD Course for Mechanical Engineers
Get PDFThe objective of this paper is to present applications of solid modeling aimed at modeling of complex geometries such as splines and blended surfaces in advanced CAD courses. These projects, in CAD-based Mechanical Engineering courses, are focused on the use of the CAD system to solve design problems for applications in machine design, namely the geometric and mechanical design of cam mechanisms
Assessing Student Work in Engineering Graphics and Visualization Course
Get PDFAdvances in computer technology have led to significant changes in the content of the freshman engineering graphics course. Course topics, textbooks, and software choices differ from one institution to another, depending in part on the programs of study the engineering graphics course serves. In addition, institutions differ in the methods used to assess student learning. A number of authors have presented their work in the area of grading criteria and assessment of student work in the freshman engineering graphics course. In the latest revision of the engineering graphics course at Georgia Tech, a backward design approach was used to identify goals for student understanding, to establish assessments for measuring student understanding, and to plan instruction. This paper describes the evolution of the freshman engineering graphics course at Georgia Tech, in terms of course content and assessment methodology. The paper includes a statement of learning objectives, an assessment matrix, and examples of student assignments
A Low Cost Virtual Reality Human Computer Interface for CAD Model Manipulation
Get PDFInteractions with high volume complex three-dimensional data using traditional two-dimensional computer interfaces have, historically, been inefficient and restrictive. However, during the past decade, virtual reality (VR) has presented a new paradigm for human-computer interaction. This paper presents a VR human-computer interface system, which aims at providing a solution to the human-computer interaction problems present in today’s computer-aided design (CAD) software applications. A data glove device is used as a 3D interface for CAD model manipulation in a virtual design space. To make the visualization more realistic, real-time active stereo vision is provided using LCD shutter glasses. To determine the ease of use and intuitiveness of the interface, a human subject study was conducted for performing standard CAD manipulation tasks. Analysis results and technical issues are also presented and discussed
Assessment of a "New and Improved" Course for the Development of 3-D Spatial Skills
Get PDFSince 1993, Michigan Tech has offered a course aimed at improving the spatial skills of incoming engineering students who have a demonstrated weakness in ability as measured by the Purdue Spatial Visualization Test: Rotations (PSVT:R). In the fall of 2000, this course was altered dramatically in terms of both content and instructional delivery method. The modified course was described in detail in a paper presented at a previous EDGD annual conference. This paper will outline the changes made in the delivery of the course, examine results from the revised course, and compare findings with results from the previous version of the course. Particular attention will be paid to changes in success and retention rates among students with weak initial spatial skills
Assessment Measures and Outcomes for Computer Graphics Programs
Get PDFComputer graphics is a fast growing field of study, which has many variable course offerings to accommodate the ever-changing technology. The differences and ambiguities in course names and degree offerings can best be explained and quantified through assessment measures. The assessment measures identify the scope of each assignment and course and identify program and department learning objectives and outcomes, and show how they are related to each other. Assessment measures also set the stage for future accreditation of a computer graphics program. This paper will discuss how to begin the assessment process for the program as a whole, and how to facilitate and use course embedded assessments within a computer graphics program and within supporting courses in other disciplines. By having a plan and a template of assessment measurement for faculty, beginning course-embedded assessments becomes an easier task for the busy faculty and will greatly improve the continuity of course offerings within the ever changing computer graphics field
A Virtual Campus Based on Human Factor Engineering
Get PDFThree Dimensional or 3D virtual reality has become increasingly popular in many areas, especially in building a digital campus. This paper introduces a virtual campus, which is based on a 3D model of The Tourism and Culture College of Yunnan University (TCYU). Production of the virtual campus was aided by Human Factor and Ergonomics (HF&E), an application which provided a convenient, comfortable, practical and simple environment for users. TCYU, in Lijiang, China, occupies approximately 800 acres. Set in a parkland environment, it is a modern campus with a rich architectural style based on local Naxi houses with gray tiles and white painted walls. Because it is very large for a virtual campus, the scale and complexity of models have been simplified. They have also been reduced for ease of loading the computer program by three means: Object-Oriented Modeling (OOM), textures and portal-connectors, and many easy-to-use tools have been created which support different input hardware and avatars to help the user tour the campus from different perspectives. Testing results show that the virtual system can run smoothly on the general personal computer