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Broadening Student Knowledge Of Dynamics By Means Of Simulation Software

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Conference

2007 Annual Conference & Exposition

Location

Honolulu, Hawaii

Publication Date

June 24, 2007

Start Date

June 24, 2007

End Date

June 27, 2007

ISSN

2153-5965

Conference Session

What's New in Dynamics?

Tagged Division

Mechanical Engineering

Page Count

14

Page Numbers

12.327.1 - 12.327.14

DOI

10.18260/1-2--1570

Permanent URL

https://peer.asee.org/1570

Download Count

206

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Paper Authors

biography

Arnaldo Mazzei Kettering University

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ARNALDO MAZZEI is an Associate Professor of Mechanical Engineering at Kettering University. He received his Ph.D. in Mechanical Engineering from the University of Michigan in 1998. He specializes in dynamics and vibrations of mechanical systems and stability of drivetrains with universal joints. His current work relates to modal analysis, stability of drivetrains, finite element analysis and CAE. He is a member of ASME, ASEE and SEM.

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biography

Richard Scott University of Michigan

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RICHARD A. SCOTT received his Ph.D. in Engineering Science from The California Institute of Technology. He is a Professor of Mechanical Engineering at the University of Michigan, Ann Arbor. He has obtained a teaching award from the College of Engineering and was selected as professor of the semester four times by the local chapter of Pi-Tau-Sigma.

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

Broadening student knowledge of dynamics by means of simulation software

Abstract

Some examples are given with the aim of broadening undergraduate student knowledge and understanding of dynamics. Typically the examples involve non-linear equations and numerical methods must be employed. Here, because of its wide availability and of its increasing use in undergraduate mathematics courses, MAPLE[1] is employed. The central goal of the work is to introduce new phenomena, and the examples treated are: (i) The effect of viscous damping on the stability of an inverted pendulum. It is shown that with a linear model viscous damping does not stabilize an unstable state, whereas damping plays an important role when a non-linear model is considered. (ii) Forced harmonic motion of a non-linear hardening spring-mass system. The numerical simulation of the response illustrates the “jump phenomena” in which the steady state amplitude undergoes a jump in passing through frequencies close to the linear resonance frequency. (iii) A simple pendulum with an oscillating support, illustrating parametric resonance. Depending on the system parameter values instabilities can occur (parametric resonance). This is shown numerically and confirmed with an available analytic expression. The associated MAPLE files are given in an appendix.

Introduction

The availability of commercial codes such as MAPLE[1] has made it possible to numerically treat problems in dynamics which are analytically intractable. Of course other codes such as MATHCAD® and MATLAB®, for example, are also available. However the thrust here is not to debate the relative merits of finite difference schemes in various software packages. The students should be aware of the nature of finite difference schemes (a simple illustrative example is given in a previous work[2]) then, at least in dynamics classes, the software may be treated as a “black box”. Several examples that broaden student physical knowledge and understanding were given previously[2], namely: a non-linear pendulum subjected to various initial conditions, showing how the period depends on the amplitude; a non-linear softening spring showing the existence of instabilities; an undamped inverted pendulum restrained by a spiral spring, illustrating the existence of multiple equilibrium states and their stability; a simulation of a sweep test (forced motion of a single-degree-of-freedom system in which the forcing frequency varies with time), showing that if the sweep rate is too fast, no resonances will be observed. Here several new examples are presented (for convenience both sets are included in TABLE 1 in an appendix, which has MAPLE worksheet objects included). The examples are: (i) the effect of viscous damping on the stability of an inverted pendulum; (ii) forced harmonic motion of a non-linear hardening spring-mass system; and (iii) a simple pendulum with an oscillating support, illustrating parametric resonance. Examples (i) and (iii) can readily be handled in a beginning course, whereas example (ii) may be more suitable for an intermediate course.

Mazzei, A., & Scott, R. (2007, June), Broadening Student Knowledge Of Dynamics By Means Of Simulation Software Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. 10.18260/1-2--1570

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