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박일수(I. S. Park),옥철호(C. H. Ok) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The purpose of this research is to study the torsional vibration characteristics of form shaft by experiment. An experimental investigated the rotational speed from 600rpm to 1500rpm through torsional vibration meter and two channel signal analyzer. The phenomenon of angular vibration displacement in small size had on stable region and that angular vibration velocity in big size had on stable region. Each points of angular vibration displacement in ф45 had on stable region and that angular vibration velocity in ф40 had on unstable region.
Disk가 부착된 회전축의 비틀림진동 특성에 관한 연구
박일수(I. S. Park) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper presented experimental results of angular vibration velocity and angular vibration displacement for the rotating shaft which is rotates below 1500rpm. A laser system of non-contact method was used, and the model of torsional vibration was horizontal rotating shaft which was attached three disks with uniformed distance. ; The distance between the disks was fixed then, diameter of disks was changed. The measured angular displacement and angular velocity in their torsional vibration were analyzed. This results will provide information for lightening, exactness and the control about rotating shafts with variable shapes.
송오섭(Ohseop Song),박상윤(Sang-Yun Park),김선홍(Sunhong Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
In this study, the torsional vibration analysis for the marine propulsion system is carried out by using the transfer matrix method(TMM). The torsional torque by gas pressure and reciprocating inertia force is caused severe torsional vibration in the shafting, which is damage to the shaft. normal torque and many harmonic torque are applied to the crankshaft and rotate the shafting. In four stroke cycle, if the cycle of the n-harmonic torque matches the natural frequency of the shaft, the torsional vibration of n/2-order is generated. In general, as a method for controlling the torsional vibration, there are various ways to change natural frequency due to the shaft diameter and the inertia moment adjustment and to reduce excitation force by firing order and crank arrangement and to lower the vibration energy by torsional vibration damper. In this paper, the viscous damper is used for reducing the torsional vibration of shafting as torsional vibration damper and it was confirmed damping effect of the torsional vibration.
비틀림 댐퍼를 이용한 트랙터 PTO 전동라인의 비틀림 진동 저감
안다빈 ( Da-vin Ahn ),오주선 ( Joo-seon Oh ),정우진 ( Woo-jin Chung ),신인경 ( In-kyung Shin ),박영준 ( Young-jun Park ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
농업용 트랙터의 진동과 소음은 동력원인 엔진과 동력전달계인 변속기 및 PTO 전동라인에서 주로 발생한다. 동력전달계의 진동과 소음은 엔진의 토크 변동에 의해 발생하며, 이는 PTO 전동라인에 비틀림 진동을 유발시킨다. 비틀림 진동은 PTO 전동라인의 구동기어와 피동기어에 연속적인 충돌을 발생시키며, 심한 진동과 래틀 소음의 원인이 된다. 트랙터의 진동 및 래틀 소음을 저감하기 위하여 비틀림 댐퍼를 설치하여 해결하려는 연구가 진행되고 있다. 본 연구에서는 비틀림 댐퍼를 이용하여 PTO 전동라인에서 발생하는 비틀림 진동을 감소시키고 공진 현상을 회피하는 연구를 수행하였다. 각속도 시험을 통해 PTO 전동라인의 비틀림 진동이 래틀 소음에 미치는 영향을 분석하였고 PTO 구동축 기어에서의 과도한 각속도 증폭을 확인하였다. 시뮬레이션 모형을 개발하여 공진 현상을 확인하였고, 공진 회피 및 비틀림 진동 저감을 위한 PTO 전동라인 모형을 개발하였으며, 실제 시험 결과를 이용하여 개발된 모형을 검증하였다. 검증된 모델을 이용하여 비틀림 댐퍼의 설계변수가 래틀 소음에 미치는 영향을 분석하였으며, 비틀림 댐퍼의 설계 변수 최적화를 수행하였다. 최적화된 비틀림 댐퍼는 공진 영역을 회피하고 비틀림 진동이 감소함을 확인할 수 있었다.
선박용 디젤엔진의 진동해석 모델링 방안 및 축계 비틀림 진동에 의한 엔진 본체 연성진동에 관한 연구
김상진,박종훈,김정렬,이기수 한국마린엔지니어링학회 2018 한국마린엔지니어링학회지 Vol.42 No.4
A low-speed diesel engine which is used as the main propulsion engine for a ship is the main source of ship vibration. Therefore, it is necessary to predict the excitation force of the engine and vibration during the design stage to improve or avoid the unexpected vibration in order to secure vibration quality of the hull and engine. In this study, we proposed a method to generate an analytical model for engine vibration of 6G60ME-C type with ultra-long stroke of MAN Diesel & Turbo, which is being recently applied to the ship. The engine-body vibration analysis was carried out considering the coupled effect with being recently crankshaft torsional vibration and the validity of the analytical model was verified through comparison with the measured results. 선박용 주 추진기관으로 적용되는 저속 디젤엔진은 선박의 주요 기진원으로 양호한 선체 및 엔진 진동 품질 확보를 위해서는 사전에 엔진 기진력 및 진동을 예측하고 진동감소를 위한 개선방안을 수립하는 것이 필요하다. 본 연구에서는 최근 선박에 주로 적용되는 초장행정 엔진인 MAN Diesel & Turbo의 6G60ME-C Type 엔진 본체진동해석을 위한해석 모델생성 방안을 제안하고 생성된 해석모델을 활용하여 비틀림 진동과 연성된 엔진 본체진동해석을 수행하고 이를측정결과와 비교/검증함으로써 해석 모델의 정합성을 확인하였다.
한형석(HyungSuk Han),이경현(KyungHyun Lee),박성호(Sungho Park),김청식(ChungSik Kim) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.5
The diesel engine and reduction gear combination is one of the common propulsion system in a naval vessel. Since the diesel engine has torsional vibration caused by reciprocating motion of the mass and gas pressure force of the cylinder, high cycle torsional fatigue can be occurred. Therefore, ROK navy restricts the maximum stress of the propulsion shaft according to MIL G 17859D. In this paper, the root cause for the failure of the diesel engine and reduction gear connecting shaft occurred in typical naval vessel is investigated based on the measured bending and torsional moment according to MIL G 17859D procedure.
이돈출(Lee, Don-Chool),로날드디.바로(Barro, Ronald D.) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
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.
음향블랙홀 보를 이용한 비틀림 진동 감쇠기의 설계 및 실험적 확인
이두호(Dooho Lee),배시완(Si Wan Bae),김선용(Sun-Yong Kim) 한국소음진동공학회 2022 한국소음진동공학회 논문집 Vol.32 No.2
In this study, a novel type of torsional vibration damper was proposed and experimentally verified. The torsional vibration damper is composed of acoustic black hole (ABH) beams arranged in the outward radial direction and a base structure to fix the root of the ABH beam. The effective frequencies of the proposed torsional vibration damper are not limited to a narrow frequency range but all frequency ranges beyond a cut-off frequency. The proposed torsional vibration damper was fabricated and examined on a test-bed for torsional vibration. The experimental results showed that the proposed torsional vibration damper reduces all vibrational peaks in the magnitude generated owing to torsional modes.
자동변속기에서 2중 동조 강성형 클러치를 이용한 입력축의 비틀림 진동 및 차체 진동의 개선에 관한 연구
정병환(Jung, Byung-Hwan),황선양(Hwang, Seon-Yang),강구태(Kang, Koo-Tae) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.10
According to torsional vibration characteristic of a tunable dual stiffness type clutch(TDSTC) in auto-transmission, the input shaft system have occurred breakdown for the duration cycle and over-vibration happened on vehicle at specific condition. This paper introduces the improvement of the torsional vibration of input shaft and the vehicle vibration by tuning of the TDSTC.
시간영역에서 과도 비틀림 진동에 의한 저속 2행정 디젤엔진의 축계 피로강도 평가
이돈출(Lee, Don-Chool),김상환(Kim, Sang-Hwan) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.7
Two stroke low speed diesel engines are widely used for marine propulsion or as power plant prime mover. These engines have many merits which includes higher thermal efficiency, mobility and durability. Yet various annoying vibrations occur sometimes in ships or at the plant itself. Of these vibrations, torsional vibration is very important and dictates a careful investigation during the engme's initial design stage for safe operation. With the rule and limit on torsional vibration in place, shaft strength fatigue due to torsional vibration however demands further analysis which possibly can be incorporated in the classification societies' rule and limit. In addition, the shaft's torsional vibration stresses can be calculated equivalently from accumulated fatigue cycles number due to transient torsional vibration in time domain. In this paper, authors suggest a new estimation method combined with Palmgren-Miner equation. A 6S70MC-C ($25,320ps{\times}91rpm$) engine for ship propulsion was selected as a case study. Angular velocity was measured, instead of shaft's strain, for simplified measurement and it was converted to torsional vibration stress for accumulated fatigue cycle numbers in shafting life time. Likewise, the accumulated fatigue calculation was compared with shaft fatigue strength limit. This new method can be further realized and confirmed in ship with two stroke low speed diesel engine.