Topic
Modal testing
About: Modal testing is a research topic. Over the lifetime, 4047 publications have been published within this topic receiving 64772 citations.
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01 Feb 1979
319 citations
TL;DR: In this paper, the authors identify instantaneous modal parameters (natural frequencies, damping characteristics and their dependencies on a vibration amplitude and frequency) in the process of free vibration analysis and through various kinds of excitation of the dynamic system.
313 citations
TL;DR: A fully automated, generally applicable three-stage clustering approach is developed for interpreting a stabilization diagram that does not require any user-specified parameter or threshold value, and can be used in an experimental, operational, and combined vibration testing context and with any parametric system identification algorithm.
304 citations
TL;DR: In this paper, the use of the combined deterministic-stochastic subspace identification algorithm for the experimental modal analysis of mechanical structures is discussed The algorithm requires artificial forces to be applied to the structure, so it can also be used for operational modality analysis (OMA), since the excitation level of the artificial forces can be low compared to the ambient forces.
293 citations
TL;DR: In this article, a damage identification technique based on changes in frequencies and mode shapes of vibration is proposed for predicting damage location and severity, which is applied at an element level with a conventional finite-element model.
Abstract: The change of modal characteristics directly provides an indication of structural damage. Based on changes in frequencies and mode shapes of vibration, a damage identification technique is proposed in this paper for predicting damage location and severity. The method is applied at an element level with a conventional finite-element model. The element damage equations have been established through the eigenvalue equations that characterize the dynamic behavior. Several solution techniques are discussed and compared. The influence of simulated noise in the modal data is also presented. The method has been verified by a number of damage scenarios for simulated beams and has found the exact location and severity of damage. It is demonstrated that multiplying the damaged eigenvalue equations with the undamaged or damaged mode shapes provides more equations and guarantees the damage localization. The resulting equations, however, become more sensitive to the deviation of modal data and the direct solution often...
274 citations