국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Experimental Methodology for Determining Turbomachinery Blade Damping Using Magnetic Bearing Excitation and Non-Contacting Optical Measurements
저자	Provenza, Andrew J.;; Duffy, Kirsten P.
Keyword	MAGNETIC BEARINGS;; MECHANICAL PROPERTIES;; OPTICAL MEASUREMENT;; PIEZOELECTRICITY;; ROTATION;; ROTOR SPEED;; TURBOMACHINERY;; VACUUM CHAMBERS
URL	http://hdl.handle.net/2060/20100039314
보고서번호	NASA/TM-2010-216770
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Experiments to determine the effects of turbomachinery fan blade damping concepts such as passively shunted piezoelectric materials on blade response are ongoing at the NASA Glenn Research Center. A vertical rotor is suspended and excited with active magnetic bearings (AMBs) usually in a vacuum chamber to eliminate aerodynamic forces. Electromagnetic rotor excitation is superimposed onto rotor PD-controlled support and can be fixed to either a stationary or rotating frame of reference. The rotor speed is controlled with an air turbine system. Blade vibrations are measured using optical probes as part of a Non-Contacting Stress Measurement System (NSMS). Damping is calculated from these measurements. It can be difficult to get accurate damping measurements using this experimental setup and some of the details of how to obtain quality results are seemingly nontrivial. The intent of this paper is to present those details.