{"id":{"repo_id":"brazil-uerj","oai_identifier":"oai:pantheon.ufrj.br:11422/3677"},"canonical_url":"https://search.dev.ndltd.org/etd/brazil-uerj/oai:pantheon.ufrj.br:11422/3677","repository":{"repo_id":"brazil-uerj","name":"Brazil UERJ","base_url":"https://pantheon.ufrj.br/oai/request"},"display":{"title":"Monitoração de sistemas mecânicos pela assinatura decrescimento aleatório","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Di Domênico, Celso"],"institution":"Universidade Federal do Rio de Janeiro","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Slama, Jules Ghislain"],"committee_chairs":[],"committee_members":[],"year":1984,"date_issued":"1984-11","date_published":"1984-11","updated_at":"2026-07-24T01:16:07Z","subjects":["Mecânica das estruturas","Análise não linear de estruturas","Mecânica do dano"],"languages":["por"],"rights":["Acesso Aberto"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11422/3677","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Slama, Jules Ghislain"]},{"key":"dc:creator","label":"Author","values":["Di Domênico, Celso"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-03-02T15:36:59Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-05-16T03:00:56Z"]},{"key":"dc:date.issued","label":"Date","values":["1984-11"]},{"key":"dc:publisher","label":"Institution","values":["Universidade Federal do Rio de Janeiro"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"]},{"key":"dc:type","label":"Dc Type","values":["Dissertação"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Mecânica das estruturas","Análise não linear de estruturas","Mecânica do dano"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["por"]},{"key":"dc:rights","label":"Dc Rights","values":["Acesso Aberto"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11422/3677"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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."]},{"key":"dc:title","label":"Title","values":["Monitoração de sistemas mecânicos pela assinatura decrescimento aleatório"]}]}],"canonical_facts":{"dc:contributor.advisor":["Slama, Jules Ghislain"],"dc:creator":["Di Domênico, Celso"],"dc:date.accessioned":["2018-03-02T15:36:59Z"],"dc:date.available":["2026-05-16T03:00:56Z"],"dc:date.issued":["1984-11"],"dc:description.abstract":["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."],"dc:identifier.uri":["http://hdl.handle.net/11422/3677"],"dc:language":["por"],"dc:publisher":["Universidade Federal do Rio de Janeiro"],"dc:publisher.department":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"],"dc:rights":["Acesso Aberto"],"dc:subject":["Mecânica das estruturas","Análise não linear de estruturas","Mecânica do dano"],"dc:title":["Monitoração de sistemas mecânicos pela assinatura decrescimento aleatório"],"dc:type":["Dissertação"]},"updated_at":"2026-07-24T01:16:07Z"}