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A New Spin On Teaching 3 D Kinematics And Gyroscopic Motion

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Conference

2008 Annual Conference & Exposition

Location

Pittsburgh, Pennsylvania

Publication Date

June 22, 2008

Start Date

June 22, 2008

End Date

June 25, 2008

ISSN

2153-5965

Conference Session

Anything New in Dynamics?

Tagged Division

Mechanics

Page Count

16

Page Numbers

13.73.1 - 13.73.16

Permanent URL

https://peer.asee.org/3858

Download Count

206

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Paper Authors

biography

Brian Self California Polytechnic State University

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Brian Self has been an Associate Professor at Cal Poly for the last two years. Before that, he taught at the Air Force Academy for seven years. He is the ASEE Campus Rep and the Zone IV Chair-Elect. Besides his pedagogical research, Dr Self is actively involved in aerospace physiology and biomechanics research. He has worked extensively to involve undergraduates in his research, taking students to present at national and international conferences. By involving students in solving ill-defined projects and problems that don’t have a “correct answer”, Dr Self hopes to further advance their intellectual curiosity and problem solving skills.

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biography

Charles Birdsong California Polytechnic State University

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Charles Birdsong has expertise in vibrations, controls, signal processing, instrumentation, real-time control, active noise control, and dynamic system modeling. He received his BSME at Cal Poly San Luis Obispo, MS and Ph.D. at Michigan State University where he worked on active noise control applications for the automotive industry. He has worked in the vibration test and measurement industry helping to drive new technologies to market and working with industry to meet their emerging needs. He is currently an Assistant Professor at California Polytechnic State University at San Luis Obispo in the Department of Mechanical Engineering teaching dynamics, vibrations and controls and is involved in several undergraduate and master’s level multidisciplinary projects. His recent research area is in active automotive safety.

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Eileen Rossman California Polytechnic State University

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Abstract
NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

A New Spin on Teaching 3D Kinematics and Gyroscopic Motion

Abstract

Students typically struggle with sophomore level dynamics – this difficulty is compounded when the material is extended to three dimensions. Coriolis acceleration can be daunting in planar kinetics – adding additional rotating frames can totally confuse students. Because most courses only offer a rudimentary coverage of three-dimensional motion, textbook problems are typically posed “at an instant in time.” For convenience, the rotating axes are usually chosen to be coincident with the non-rotating axes, and there are seldom rotations about multiple axes. Because of this, students rarely understand the time dependent nature of three-dimensional kinematics and how body-fixed rotating axes systems change over time. To help address this problem, a project was created that requires students to create a model of a motion-based flight simulator. In addition, hands-on mini-labs demonstrating gyroscopic motion were developed to provide a physical feel for three-dimensional kinematics. In the 3D Matlab simulation project, students were first provided a description of how the simulator moves. The team of 3-4 students created a physical model of the simulator with a representation of the different axis systems. This model was used to help the teams develop coordinate transformation matrices between the different axis systems. The angular velocities for each of the different motors (planetary, pitch, and roll) were provided to the student teams and they were asked to determine (a) the angular velocity and acceleration that a pilot in the gondola would experience and (b) the linear accelerations at the pilot’s head (i.e., the vestibular system). After calculating the inertial tensors for the gondola and the planetary arm, students determined the kinetic energy of the system and the moments applied at different bearings in the system as functions of time. We have found that students gain a good appreciation for the time varying nature of 3D kinematics, and understand how to do problems where the rotating and non-rotating axes are not coincident. An animation using the Matlab Virtual Reality Toolbox allowed the students to visualize the kinematic solution and also provided a visual check that the solution is valid. To help students gain a physical appreciation for gyroscopic motion, a set of mini-labs was created. Although most dynamics instructors routinely use a spinning bicycle wheel as a demo, few students get to experience the motion first hand. Similarly, toy gyroscopes can be used to help teach students about precession and demonstrate how gyroscopic navigational devices operate. These hands-on laboratories can be much more powerful than demonstrations and lecturing – the students can actually feel the gyroscopic moments generated. These demonstrations were assessed through two problems on the final examination. The first asked what happens to the motion of a gyroscope when you push gently on the outer gimble. The second involved the action-reaction moments involved with gyroscopic motion (e.g., if you are riding your bike and lean to the left, which way to do you have to push on your handlebars). Scores on these different problems along with subjective survey results were used to assess the effectiveness of the mini-labs.

Self, B., & Birdsong, C., & Rossman, E. (2008, June), A New Spin On Teaching 3 D Kinematics And Gyroscopic Motion Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. https://peer.asee.org/3858

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