Nondestructive Evaluation of Parts With Degenerate Modes Using Pseudorepeated RootsSource: Journal of Dynamic Systems, Measurement, and Control:;2004:;volume( 126 ):;issue: 003::page 498Author:Brandon J. Jellison
,
Research Assistant
,
David C. Nelson
,
Harold R. Kess
,
Research Assistant
,
Douglas E. Adams
DOI: 10.1115/1.1789536Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The modes of vibration of manufactured parts can be good indicators of the overall quality of the manufacturing process. That is, deviations in the modal frequencies or modal vectors of mechanical parts can help to identify outlier or systemic problems in the raw materials or fabrication procedure. A novel method for characterizing nonuniformities in homogeneous symmetric parts using pseudorepeated modal frequencies is discussed in this paper. It is demonstrated that the spacing between pseudorepeated roots in dominantly symmetric manufactured parts is a direct indicator of nonuniformities (i.e., inclusions, voids) in the stiffness or mass distributions. Smaller differences between split-peaks indicate less nonuniformity, and hence, higher quality parts. A simple fourth-order lumped parameter model is used to elaborate on this technique analytically, a representative finite element model is used to further this development, root locus techniques are used to study the sensitivity to nonuniformities, and acceleration response data from impact vibration tests on deep drawn hemispherical shells are used to verify the approach experimentally.
keyword(s): Manufacturing , Nondestructive evaluation , Vibration , Frequency , Shells AND Stiffness ,
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contributor author | Brandon J. Jellison | |
contributor author | Research Assistant | |
contributor author | David C. Nelson | |
contributor author | Harold R. Kess | |
contributor author | Research Assistant | |
contributor author | Douglas E. Adams | |
date accessioned | 2017-05-09T00:12:34Z | |
date available | 2017-05-09T00:12:34Z | |
date copyright | September, 2004 | |
date issued | 2004 | |
identifier issn | 0022-0434 | |
identifier other | JDSMAA-26333#498_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/129758 | |
description abstract | The modes of vibration of manufactured parts can be good indicators of the overall quality of the manufacturing process. That is, deviations in the modal frequencies or modal vectors of mechanical parts can help to identify outlier or systemic problems in the raw materials or fabrication procedure. A novel method for characterizing nonuniformities in homogeneous symmetric parts using pseudorepeated modal frequencies is discussed in this paper. It is demonstrated that the spacing between pseudorepeated roots in dominantly symmetric manufactured parts is a direct indicator of nonuniformities (i.e., inclusions, voids) in the stiffness or mass distributions. Smaller differences between split-peaks indicate less nonuniformity, and hence, higher quality parts. A simple fourth-order lumped parameter model is used to elaborate on this technique analytically, a representative finite element model is used to further this development, root locus techniques are used to study the sensitivity to nonuniformities, and acceleration response data from impact vibration tests on deep drawn hemispherical shells are used to verify the approach experimentally. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Nondestructive Evaluation of Parts With Degenerate Modes Using Pseudorepeated Roots | |
type | Journal Paper | |
journal volume | 126 | |
journal issue | 3 | |
journal title | Journal of Dynamic Systems, Measurement, and Control | |
identifier doi | 10.1115/1.1789536 | |
journal fristpage | 498 | |
journal lastpage | 508 | |
identifier eissn | 1528-9028 | |
keywords | Manufacturing | |
keywords | Nondestructive evaluation | |
keywords | Vibration | |
keywords | Frequency | |
keywords | Shells AND Stiffness | |
tree | Journal of Dynamic Systems, Measurement, and Control:;2004:;volume( 126 ):;issue: 003 | |
contenttype | Fulltext |