Moire assisted vibrational analysis of a cantelever beam : a case study / Analise vibracional de viga engastada utilizando a tecnica de moire : um estudo de caso

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Vibration phenomena are of common occurrence in mechanics, generally associated to structural members as well as to machine elements. Particularly, in the field of agricultural engineering, vibration comes also associated to vegetable bruising during field operations, which clearly includes harvesting, transportation and processing. The selection of a simple structural member as a cantilever beam to support the utility of a moiré technique in studying vibration analysis is to validate the method when more complex structures are being considered. Vibration modes of a cantilever beam are easily determined by analytical methods. The name moiré has its origin in the French language, referring to wave like pattern. The phenomenon is generated when screens superposed, producing wave like patterns or fringes, which move when its relative positions are displaced. The selected method is named geometric moiré, which consists in projecting a grid onto the object in study and superposing both, the original and the deformed grid. Specific software s were employed in the image analysis. The objective of the present work is to determine the transversal displacement of the elastic line of Euler-Bernoulli cantilever beam being excited by an electromagnetic varying field using the moiré technique described above. Keywords: vibration, geometric moiré.

ASSUNTO(S)

interferometria vibração vibration interferometry

ACESSO AO ARTIGO

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