Subspace-based damage detection on steel frame structure under changing excitation

International audienceDamage detection can be performed by detecting changes in the modal parameters between a reference state and the current (possibly damaged) state of a structure from measured output-only vibration data. Alternatively, a subspace-based damage detection test has been proposed and applied successfully, where changes in the modal parameters are detected, but the estimation of the modal parameters themselves is avoided. Like this, the test can run in an automated way directly on the vibration measurements. However, it was assumed that the unmeasured ambient excitation properties during measurements of the structure in the reference and possibly damaged condition stay constant, which is hardly satisfied by any application. A new version of the test has been derived recently that is robust to such changes in the ambient excitation. In this paper, the robust test is recalled and its performance is evaluated both on numerical simulations and a real application, where a steel frame structure is artificially damaged in the lab

O que a comparação entre a tradição religiosa e os novos movimentos religiosos nos ensina sobre o sujeito hoje? Religious tradition and the new religious movements compared: a vision about the subject today

O artigo toma a distinção feita por Freud (1939/1996) em "Moisés e o monoteísmo", entre uma tradição herdada e uma tradição comunicada, para comparar alguns traços das religiões tradicionais com características dos novos movimentos religiosos. Usando os recursos epistemológicos que mais tarde foram desenvolvidos por Lacan, observa que a religião monoteísta mantém relação com uma tradição herdada, pondo em cena um real. Argumenta que tanto essa relação quanto a tradição foram perdidas nas práticas das seitas atuais. Conclui que devido ao afastamento dessa dimensão que remete a um real, as novas práticas religiosas recebem uma inflexão que as coloca ao lado da mera prescrição comportamental, fazendo de seus adeptos, sujeitos de uma nova economia psíquica.<br>The article resumes the distinction referred to by Freud (1939/1996) in the text "Moses and Monotheism" between an inherited tradition and a tradition transmitted by communication. Uses this distinction in order to compare some traits of traditional religions with characteristics of the new religious movements. Utilizes epistemological tools developed by Lacan to observe that the monotheistic religion is related to the inherited tradition - the one that supposes the dimension of the real. This tradition and the relation that it entails were lost in the sectarian practices of today. It concludes that due to the fact that they are not related to the dimension of the real new religious practices become subject to mere behavior prescription. Their followers being subjects to a new psychic economy