Accession Number : AD0434390

Title :   A PHOTOGRAMMETRIC METHOD OF DETERMINING THE MODE SHAPES OF VIBRATING OBJECTS AND RESULTS FOR A THIN WING,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO)

Personal Author(s) : Ohman,L. H. ; van Wijk,M. C.

Report Date : 1943

Pagination or Media Count : 6

Abstract : A photogrammetric method of measuring the maximum displacements of a harmonically oscillating structure is described. A photographic exposure is taken of reference marks on the oscillating object and the photogrammetric measurements are made on the negative plate. The method has been applied to determine the normal mode shapes of a thin wing. The experimental arrangements for these tests are described and the results for the first two normal modes presented. (Author)

Descriptors :   (*PHOTOGRAMMETRY, AIRFOILS), STRUCTURES, VIBRATION, PHOTOGRAPHIC RECORDING SYSTEMS, LOW DRAG AIRFOILS, SUPERSONIC AIRFOILS, DEFLECTION, MEASUREMENT, TEST METHODS, WINGS

Distribution Statement : APPROVED FOR PUBLIC RELEASE