국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	ANALYSIS OF STRUCTURAL RESPONSE DATA USING DISCRETE MODAL FILTERS.
저자	Lawrence C. Freudinger
Keyword	Aeroservoelastic; Flight test; Modal filter; Modal test; Reciprocal modal vector; Spatial filter; Vibration control
URL	http://www.dfrc.nasa.gov/DTRS/1991/PDF/H-1693.pdf
보고서번호	NASA-CR-179448
발행년도	1991
출처	NASA Dryden Flight Research Center
ABSTRACT	This thesis describes the application of reciprocal modal vectors to the analysis of structural response data. Reciprocal modal vectors are constructed using an existing experimental modal model and an existing frequency response matrix of a structure, and can be assembled into a matrix that effectively transforms the data from the physical space to a modal space within a particular frequency range. In other words, the weighting matrix necessary for modal vector orthogonality (typically the mass matrix) is contained within the reciprocal model matrix. The ability to extract the response of a particular mode from a system due to whatever forces may be acting on it has broad appicability, from operating date analysis and force identification to vibration control. The underlying goal of this work is mostly directed toward observing the modal state responses in the presence of unknown, possibly closed loop forcing functions, thus having an impact on both operating data analysis techniques and independent modal space control techniques. This study investigates the behavior of reciprocol modal vectors as modal filters with respect to certain calculation parameters and their performance with perturbed system frequency response data.