Accession Number : AD0630433

Title :   THE CRITICAL DAMPING CALCULATOR AND THE EVALUATION OF MEASURING SYSTEMS TO DETERMINE DAMPING PROPERTIES OF STRUCTURES.

Descriptive Note : Research and development rept.,

Corporate Author : NAVY MARINE ENGINEERING LAB ANNAPOLIS MD

Personal Author(s) : Douglas,B. ; Longley,C.

Report Date : MAR 1966

Pagination or Media Count : 21

Abstract : An analysis of existing experimental methods for measuring damping properties of structures revealed measurement limitations not previously reported. A new experimental approach, the critical damping calculator developed by MEL, is compared with previously used measurement systems and with theoretical results. Deficiencies in all the reported methods (free decay and the various impedance methods) are discussed, and a range of accuracy is determined and tabulated. The critical damping calculator was found to give relatively accurate results over a broad measurement range where a combination of the other measurement systems would be necessary to obtain the same accuracy. (Author)

Descriptors :   (*DAMPING, MEASUREMENT), (*STRUCTURES, VIBRATION), NOMOGRAPHS, MARINE ENGINEERING

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE