Article | REF: R6191 V1

Vibrations of industrial structures - Modeling, predictive and interpretation tools

Author: Bernard GARNIER

Publication date: June 10, 2009, Review date: October 4, 2021

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ABSTRACT

After having introduced certain physical quantities necessary to the approach, this article presents a number of modeling methods for the vibratory phenomena of industrial structures which forecast or confirm a necessary experimental approach. Therefore, in order to assist the designer, installer and operator, a set of tools is available, be they conceptual (methods) or material (means for analyzing and testing). These qualitative and quantitative approaches produce several representation charts of the vibratory phenomena: calculation by finite elements, energy methods and mass-spring diagrams.

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AUTHOR

  • Bernard GARNIER: Civil engineer from the École nationale des ponts et chaussées - Technical Operations Director at THALES Underwater Systems

 INTRODUCTION

This article makes the deliberate choice of first presenting a number of methods for modeling and predicting vibratory phenomena (§ 1 to ), before describing experimental approaches, considering that today's engineering practice must favor predictive over curative. The maturity of the approaches described is such that any problem properly posed, with the introduction of a few necessary physical quantities, can be solved by calculation, the test often being carried out only as a check, or even substituted for the calculation because it is more economical. On the other hand, a test alone is generally not sufficient to interpret the often highly complex observations of the vibratory state of an industrial structure, and modeling must accompany and support it, predicting the effect of any modifications and thus guiding the designer, installer and operator.

However, if there is any doubt between prediction and reality, the experimental result, if it can be achieved and is not disputable, cannot but impose itself on the engineer. It is therefore the purpose of paragraph 7 and of the article Industrial vibration sensors [R 6 193] to present the full range of measurement and test equipment available on the market, and then, in the fascicule [R 6 192] Vibrations des structures industrielles. Tools and methods for experimental analysis, signal and information processing techniques and a few criteria.

What follows is a description of a set of "tools", whether conceptual tools (i.e. methods) or material tools (i.e. analysis and testing resources), bearing in mind that the engineer, who is generally called upon to carry out remedial work, must not only identify a specific disorder (diagnosis), but also specify corrective solutions: In this case, he or she needs to use diagrams to represent vibratory phenomena, which will enable him or her to identify, qualitatively or quantitatively, the physical...

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Vibration of industrial structures