[국내논문]튜닝댐퍼를 갖는 초대형 저속 2행정 디젤엔진의 비틀림진동 특성에 관한 연구 A Study on the Torsional Vibration Characteristics of Super Large Two Stroke Low Speed Diesel Engines with Tuning Damper원문보기
최근 조선소에서 고출력 디젤엔진의 요구에 의해서 초대형 저속 2행정 디젤엔진이 개발되었으며, 연속최대출력이 $8{\sim}14$실린더를 갖는 10만 마력 이상의 엔진을 사용할 수 있게 되었다. 이러한 엔진들은 열효율, 운전에 대한 신뢰성, 강인성 및 기동성은 뛰어나지만 크랭크축을 포함한 추진축계에서 높은 비틀림진동을 유발한다. 따라서 이 연구에서는 엔진설계자의 입장에서 비틀림진동을 줄이기 위하여 튜닝 비틀림진동 댐퍼를 갖는 추진축계의 비틀림진동을 이론적으로 검토하였으며 실험모델인 12K98MC엔진과 12RT-flex엔진에서 튜닝댐퍼의 성능과 동적거동을 확인하고 있다.
최근 조선소에서 고출력 디젤엔진의 요구에 의해서 초대형 저속 2행정 디젤엔진이 개발되었으며, 연속최대출력이 $8{\sim}14$실린더를 갖는 10만 마력 이상의 엔진을 사용할 수 있게 되었다. 이러한 엔진들은 열효율, 운전에 대한 신뢰성, 강인성 및 기동성은 뛰어나지만 크랭크축을 포함한 추진축계에서 높은 비틀림진동을 유발한다. 따라서 이 연구에서는 엔진설계자의 입장에서 비틀림진동을 줄이기 위하여 튜닝 비틀림진동 댐퍼를 갖는 추진축계의 비틀림진동을 이론적으로 검토하였으며 실험모델인 12K98MC엔진과 12RT-flex엔진에서 튜닝댐퍼의 성능과 동적거동을 확인하고 있다.
The shipbuilder's requirement for a higher power output rating has led to the development of a super large two stroke low speed diesel engines. Usually a large-sized bore engine ranging from $8{\sim}14$ cylinders, this engine group is capable of delivering power output of more than 100,00...
The shipbuilder's requirement for a higher power output rating has led to the development of a super large two stroke low speed diesel engines. Usually a large-sized bore engine ranging from $8{\sim}14$ cylinders, this engine group is capable of delivering power output of more than 100,000 bhp at maximum continuous rating(mcr). Other positive aspects of this engine type include higher thermal efficiency, reliability, durability and mobility. This plays a vital role in meeting the propulsion requirement of vessels, specifically for large container ships, of which speed is a primary concern to become more competitive. Consequently, this also resulted in the modification of engine parameters and new component designs to meet the consequential higher mean effective pressure and higher maximum combustion pressure. Even though the fundamental excitation mechanisms unchanged, torsional vibration stresses in the propulsion shafting are subsequently perceived to be higher. As such, one important viewpoint in the initial engine design is the resulting vibration characteristic expected to prevail on the propulsion shafting system(PSS). This paper investigated the torsional vibration characteristics of these super large engines. For the two node torsional vibration with a nodal point on the crankshaft, a tuning damper is necessary to reduce the torsional stresses on the crankshaft. Hence, the tuning torsional vibration damper design and compatibility to the shafting system was similarly reviewed and analyzed.
The shipbuilder's requirement for a higher power output rating has led to the development of a super large two stroke low speed diesel engines. Usually a large-sized bore engine ranging from $8{\sim}14$ cylinders, this engine group is capable of delivering power output of more than 100,000 bhp at maximum continuous rating(mcr). Other positive aspects of this engine type include higher thermal efficiency, reliability, durability and mobility. This plays a vital role in meeting the propulsion requirement of vessels, specifically for large container ships, of which speed is a primary concern to become more competitive. Consequently, this also resulted in the modification of engine parameters and new component designs to meet the consequential higher mean effective pressure and higher maximum combustion pressure. Even though the fundamental excitation mechanisms unchanged, torsional vibration stresses in the propulsion shafting are subsequently perceived to be higher. As such, one important viewpoint in the initial engine design is the resulting vibration characteristic expected to prevail on the propulsion shafting system(PSS). This paper investigated the torsional vibration characteristics of these super large engines. For the two node torsional vibration with a nodal point on the crankshaft, a tuning damper is necessary to reduce the torsional stresses on the crankshaft. Hence, the tuning torsional vibration damper design and compatibility to the shafting system was similarly reviewed and analyzed.
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문제 정의
Two twelve (12) cylinder engines with a 980 mm and 960 mm bore were employed as case study models. This study investigated the dynamic characteristics of torsional vibrations of super large two stroke low speed engines with tuning damper. Onboard measurements were carried out to confirm the theoretical calculated value of the torsional vibration stresses of the PSS.
제안 방법
This study investigated the dynamic characteristics of torsional vibrations of super large two stroke low speed engines with tuning damper. Onboard measurements were carried out to confirm the theoretical calculated value of the torsional vibration stresses of the PSS. Likewise, the angular velocities of the turning(fly) wheel were measured and the function of the Geislinger tuning damper was confirmed through its monitoring system.
A 12RT-flex 96C-B engine having a shaft power of around 93,360 SHP at 102 RPM was used as the second study model and emphasis was likewise focused on the two node torsional vibration of the PSS.
대상 데이터
. Two twelve (12) cylinder engines with a 980 mm and 960 mm bore were employed as case study models. This study investigated the dynamic characteristics of torsional vibrations of super large two stroke low speed engines with tuning damper.
Similarly, a damper is necessary if resonance occurs around the maximum continuous revolution and a barred operation zone (critical speed) can not be assigned. For the purpose of this study, a 12K98MC and a 12RTflex 96C-B engine were used as case models. Likewise, with the damping coefficient becoming larger in the second node vibration than the one node vibration system, a Geislinger type damper was installed to control the second node vibration.
성능/효과
(2) Four torsional vibration measuring points of the 12K98MC and 12RT-flex 96C-B engines were compared and evaluated. The calculated and measured torsional stresses of the crankshaft and intermediate shaft, and the outer damper angular velocity of both engines have shown proportional pattern.
후속연구
(4) The dynamic response of 12RT-flex 96C-B engine’s calculated and measured inner damper angular velocities was found to be almost equal, though this can not be attributed solely on measurement errors, this circumstance necessitates further study.
참고문헌 (11)
MAN B&W Diesel, 2006, First MAN B&W Diesel Engine Over 100000 BHP Now In Service, Press Release
Det Norske Veritas, Cost-saving Vibration Calculation for Shafting Systems, DNV
Lee, D. C., et al, 1992, “A Study on the Dynamic Characteristics and Performance of Geislinger Type Torsional Vibration Damper for Two stroke Low Speed Diesel Engines,” Journal of the Korean Society of Marine Engineering, Vol 16, No. 5, pp. 329-340
MAN B&W, 1988, “Vibration Characteristics of Two Stroke Low Speed Diesel Engines,” MAN B&W
MAN B&W, 2000, “An Introduction to Vibration Aspects of Two Stroke Diesel in Ships,” MAN B&W
Hyundai Heavy Industries Co. Ltd., 1993, “Dynamic Characteristics and Performance of Tuning Torsional Vibration Damper for Hyundai ？ MAN B&W Two Stroke Low Speed Diesel Engine,” MAN B&W Diesel AS, Meeting of Licensees
Nestorides, E. J., 1958, “A Handbook on Torsional Vibration, BICERA Research Laboratory,” Cambridge University Press
Wachel, J. C., Szenazi F. R., 1993, “Analysis of Torsional Vibrations in Rotating Machinery,” 22nd TurboMachinery Symposium
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