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크롤러 크레인에서 붐의 러핑각도에 따른 전도 모멘트와 와이어 로프 장력 사이의 관계
장효필(Hyo Pil Jang),한동섭(Dong Seop Han),한근조(Geun Jo Han) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
An overload limiter is used to prevent the overturning accident of a crawler crane during an operating. Recently the simultaneous measuring method, which measures hoisting load and overturning moment of the crane, is demanded instead of the existing method, which measures load at the end of boom. The simultaneous measuring method is how to conduct the hoisting load and overturning moment as measuring the tension of luffing wire for a driving of boom. To develop this preventing device for an overturning, the relation between the hoisting load and the overturning moment and the tension of luffing wire according to the luffing angle of boom must be numerically defined. In this study, the relation formula is derived between the hoisting load and the tension of wire and between the overturning moment and the tension according to the luffing angle of boom. Next the formula is compensated by application of the deflection of boom that is obtained by conduction the finite element analysis.
크롤러 크레인에서 붐의 처짐을 고려한 러핑와이어 장력과 전도모멘트 사이의 관계식 보정
장효필(Hyo-Pil Jang),한동섭(Dong-Seop Han) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.4
The crawler crane, which consists of a lattice boom, a driving system, and movable vehicle, is widely used in a construction site. It needs to be installed an overload limiter to prevent the overturning accident and the fracture of structure. This research is undertaken to provide the relation formula for designing the overload limiter as follows: First the relation formulas between the wire-rope tension and the hoisting load or the overturning ratio according to the luffing angle and length of a lattice boom are established. Secondly the derived formulas are corrected by using the compensated angle considering the deflection of boom through the finite element analysis. The stiffness analysis is carried out for 30-kinds of models as a combination of 6-kinds of luffing angle and 5-kinds of length of boom. Finally the shape design of a stick type load cell, which is the device to measure the wire-rope tension, is performed. 5-kinds of notch radius and 5-kinds of center hole radius are adopted as the design parameter for the strength analysis of the load cell.
연성해석을 통한 컨테이너 크레인의 경보시스템용 기준데이터 도출
한동섭(Dong Seop Han),장효필(Hyo Pil Jang),곽기석(Ki Suk Kwak),김태형(Tae Hyeong Kim),한근조(Geun Jo Han) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3
본 연구는 풍하중 하에서 컨테이너 크레인의 전도사고 예방을 위한 정보시스템용 기준데이터를 도출하기 위하여 수행된다. 분석방법으로 유동구조연성해석과 풍동실험이 사용되며, 크레인의 안정성에 대한 풍하중의 영향을 평가하기 위하여 컨테이너 터미널에서 널리 사용되고 있는 50 톤급 컨테이너 크레인이 해석모델로 선정되고, 19 가지 풍향이 설계변수로 채택된다. 연구방법은 먼저 경계층풍동을 사용하여 풍향에 따른 컨테이너 크레인 모형에 대한 풍동실험을 수행하고, ANSYS와 CFX를 사용하여 실제 크레인의 유동구조연성해석을 수행한다. 다음으로 유동구조연성해석을 통해 산출된 부상력과 풍동실험을 통해 도출된 부상력을 비교하여 두 방법에 있어서 차이을 보정하기 위한 식을 제시한다. This study is conducted to provide the reference data to design the alarm system to prevent an overturning accident of a container crane under wind load. Two methods, namely FSI analysis and wind tunnel test, are adopted in this investigation. To evaluate the effect of wind load on the stability of the crane, 50-ton class container crane widely used in container terminals is adopted for analysis model and 19-values are considered for wind direction as design parameter. Firstly the wind tunnel test for the reduced scale container crane model is performed according to the wind direction using an Eiffel type atmospheric boundary-layer wind tunnel, and next the FSI analysis for the real scale container crane is conducted using ANSYS and CFX. Then the uplift force yielded from FSI analysis is compared with it yielded from wind tunnel test. Finally the formula is suggested to compensate the difference between FSI and test.
부유식 원형구조물의 사각틀(Sideline) 계류에 따른 계류장력의 공간분포
김홍진(Hong-Jin Kim),윤준호(Joon-Ho Yoon),장효필(Hyo-Pil Jang),정종현(Jong-Hyun Jeong) 한국연안방재학회 2020 한국연안방재학회지 Vol.7 No.1
The spatial mooring tensions in sideline mooring systems for waves acting on floating collar were analyzed. In the sideline mooring system, the wave force acting on the floating collar was properly spreaded to the each mooring tension. However, the mooring tension tends to increase in the connecting and mooring ropes depending on the wave and structure conditions. The results are summarized as follows. 1. In the sideline mooring system, the sum of mooring tensions at the rear joint point was more than four times higher than the sum of mooring tensions at the front joint point. 2. The maximum mooring tension was occurred when the wave-steepness(H/L₀) was 0.05 to 0.08 and the relative diameter(B/L₀) was 0.15. 3. At the front joint point, mooring tension develops around the mooring rope connected to the anchor, At the rear joint point, high mooring tension occurred in the bridle and mooring ropes entrained with the direction of incident wave. 4. Although the load distribution is the main function of the bridle rope of the floating collar, more than 10 times of deviation may occur depending on the wave condition. Therefore this must be taken into account in the design.