The Added Mass and Damping for the Axial Rigid Body Motion of a Marine Propeller Rotating in a Uniform Flow

AbstractAn experimental method to estimate the added mass of a marine p ropeller has been developed for the axial rigid body motion in still water, and t he experiments have been carried out. The experimental result has been compared to the theoretical result by PRODAS based on the unsteady lifting surface theory. The experimental method developed in this research and the theoretical method by PRODAS have been validated by confirming good agreements between the experimental results and the theoretical ones. Also the comparison to the results by empirical formula has been made and discussed. ※Keywords: Propeller(프로펠러), Added mass(부가질량), Axial vibration(종진동), Rigid body motion(강체운동), Vibration experiment in water(수중진동시험), Unsteady lifting surface theory(비정상 양력면이론) 1. 서 론 최근 신형식의 프로펠러들이 선박에 적용되는 추세에 따라 설계 단계에서부터 프로펠러의 진동특성에 관하여 보다 정도 높은 추정기법이 요구되고 있다.최근 국내에서는 이에 대한 연구로 축계진동시 프로펠러의 부가질량 및 감쇠, 프로펠러 명음 (singing), 프로펠러 날개의 탄성진동 등에 대한 접수일: 2008년 4월 29일, 승인일: 2008년 5월 22일✝교신저자: hylee@cnu.ac.kr, 042-821-6626