6. Direct measurement

Direct measurement of modal parameters during vibration testing is not only of historical and educational interest, but also a reference method in terms of reliability of results.

6.1 Isolated mode

Let's first consider the case of an isolated mode in the spectrum. In the absence of coupling with neighboring modes, all ddl oscillate in phase or in phase opposition to each other under sinusoidal excitation in the vicinity of the natural frequency (see § 3.2.2

You do not have access to this resource.

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!

The Ultimate Scientific and Technical Reference

A Comprehensive Knowledge Base, with over 1,200 authors and 100 scientific advisors

+ More than 10,000 articles and 1,000 how-to sheets, over 800 new or updated articles every year

From design to prototyping, right through to industrialization, the reference for securing the development of your industrial projects

This article is included in

Mechanical and dimensional measurements

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Subscribe now!

Ongoing reading
Direct measurement

Previous
page Modal identification

Local modal identification

Bibliography

(1) - RAYLEIGH (J.W.S.) - The Theory of Sound. Volume 1. - MacMillan (1877).
(2) - BASILE (R.) - Recherche des caractéristiques dynamiques des systèmes continus. - Publications Scientifiques et Techniques du ministère de l'Air, n° 261...