June 22, 2008
June 22, 2008
June 25, 2008
13.1382.1 - 13.1382.14
Vibration Labs to Help Achieve a Resonance in Learning
Abstract A sequence of laboratories has been designed and implemented in an undergraduate course in mechanical vibrations to introduce students to experimental aspects of vibrations and experimental modal analysis. Unfortunately, undergraduate vibration courses, especially if they do not have a lab associated with them, are often perceived by many students to be courses in differential equations. By exposing students to vibration measurement instrumentation such as accelerometers and dynamic signal analyzers, and by allowing them to take experimental data, calculate frequency response functions, and identify system parameters and mode shapes, student learning and motivation is enhanced. One characteristic of the labs described in this paper, in contrast to other vibrations labs discussed in the literature, is the way each lab builds upon the previous one and the fact students test real engineering structures. The initial labs in the course use Electronic Control Products (ECP) hardware and introduce the idea of frequency response functions (FRFs) and system identification. After students are familiar with these ideas, they progress to using PHOTON II’s (a 32 bit, 4 channel data acquisition system), RT Pro for data acquisition and signal processing, and DIAMOND for system identification and mode shape animation. In this paper the labs will be described and assessment results presented as to their efficacy.
According to the dictionary, resonance is “a vibration of large amplitude in a mechanical or electrical system caused by a relatively small periodic stimulus of the same or nearly the same period as the natural vibration period of the system.”1 Thus, a large motion can result from a very small stimulus if it is at just the right frequency, that is, at the natural frequency of the system. Is there an analogous phenomenon in learning? Do some teaching strategies result in a larger amount of learning, or a “resonance” in learning, than others? How does one achieve this resonance?
According to the National Research Council report How People Learn: Brain, Mind, Experience and School2, one aspect of effective learning is its durability, that is, does the learning have long- term impact in the ways it influences other kinds of learning or performance? A key conclusion in this report on the concept of durability is the fact that it is essential for a learner to develop a sense of when what has been learned can be used--the conditions of application. Failure to transfer is often due to learners' lack of this type of conditional knowledge. If the problems examined in a vibrations course are always presented in the context of idealized mass, stiffness and damping elements, i.e. looking nothing like a realistic system, then it will be difficult for students to apply the concepts discussed in the course.
Unfortunately, vibrations courses often do not have a dedicated lab associated with them, and the only exposure students have to vibrations experiments are in more general laboratory courses on
Cornwell, P. (2008, June), Vibrations Labs To Help Achieve A Resonance In Learning Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. https://peer.asee.org/3100
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