Author

Yin Fang

Publication Date

1992

Document Type

Dissertation/Thesis

First Advisor

Gupta, Abhijit

Degree Name

M.S. (Master of Science)

Department

Department of Mechanical Engineering

LCSH

Bolted joints--Vibration--Mathematical models||Vibration--Mathematical models||Printed circuits--Mathematical models

Abstract

One of the most typical supports for the printed circuit boards is a bolted joint.Un- derstanding the properties of bolted joints is necessary before a vibration analysis of circuit boards can be made. A bolted joint typically used to support printed circuit boards made of copper clad epoxy fiber glass is analyzed in this thesis. The bolted joint is modeled by appropriate linear and torsional springs. In order to isolate the bolted joint without being concerned about the elastic properties of the circuit board, a beam is made with an aluminum box channel attached to a beam made of copper clad fiber glass epoxy. This box beam attachment makes the beam very rigid in bending. The stiffness values are estimated by applying experimental modal analysis data to the beam model. Another experiment using Linear Variable Differential Transformer (LVDT) is performed to verify the results. Rayleigh damping is used to model the damping provided by the joint These damping parameters are obtained from experimental modal damping ratios. Finally, a different size beam, but with the same bolted joint, is used to compare theoretical and experimental natural frequencies and damping ratios.

Comments

Includes bibliographical references (pages 24)

Extent

vi, 24 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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