Monitoração de sistemas mecânicos pela assinatura decrescimento aleatório

The applicability of the "Random Decrement Function" to the detection of failures in linear mechanical systems is studied together with its sensitivity to the variations of measurement parameter such as, accelerometer position, frequency range, threshold level, number of samples. A continuous system consisting of a cantilever beam excited at its end has been studied. The sensitivity of the first natural modes under variation of the spring-mass characteristics at the end, is obtained, using Euler and Timoshenko theories. The theorectical basis for the Randon Decrement Function is presented to single degree of freedom and continuous systems. Experimentally obtained Random Decrement Signatures for the cantilever beam excited at the end indicate the convenient threshold level, number and size of samples, the sensitivity to failures, and also verify the repeatability of these signatures.

Grantor dc:publisher

Universidade Federal do Rio de Janeiro

Year dc:date.issued

1984

Author dc:creator

• Di Domênico, Celso

Advisor dc:contributor.advisor

• Slama, Jules Ghislain

• Mecânica das estruturas
• Análise não linear de estruturas
• Mecânica do dano

Statement dc:rights

• Acesso Aberto

Language dc:language

por

Handle dc:identifier.uri

http://hdl.handle.net/11422/3677

OAI identifier oai:identifier

oai:pantheon.ufrj.br:11422/3677