• 한국강구조학회 논문집
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• 제12권6호
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• pp.715-725
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• 2000

본 논문은 링크구성 설계를 통하여 결정된 하나의 이중링크 형식 수평인입 집 크레인에 대하여 작업위치에 따라 각 링크의 변위, 속도, 가속도 해석을 하고, 인입 가감속에 의한 관성력, 바람에 의한 풍하중, 크레인 자중 및 정격 권상하중 등이 크레인에 작용할 때 인입장치에 요구되는 정적 힘을 계산하였다. 모든 해석과정은 전산 프로그램으로 작성되었고, 프로그램의 신뢰성은 관련 범용 소프트웨어들의 해석 결과와 비교하여 검증하였다. 따라서, 본 논문에서 개발한 전산 프로그램은 이중링크 형식 수평인입 집 크레인의 설계 실무에 있어서 이동하중에 대한 인입궤적의 진폭 및 작업위치에 따라 인입장치에 요구되는 힘의 해석을 신속, 정확하게 처리할 수 있어 설계의 생산성 및 신뢰성 제고뿐만 아니라 기본설계 기술력의 확보 측면에서 그 의의가 있다.

• 동력기계공학회지
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• 제15권1호
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• pp.57-63
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• 2011

It is very important to determine link composition of a crane in the basic design of the crane. There are many parameters in the design for the link composition of a double link type level luffing jib crane. We analyze the variation of link composition according to the variation of these parameters which are the angle of fixed link, the angle between the fixed link and backstay when the position of the crane is the maximum working radius, the ratio of fly jib length between two moving hinges to the total length of fly jib, the length of backstay, and the slewing radius. In this paper, we describe the application of the previous analysis program of the link composition design for a double link type level luffing jib crane.

• 동력기계공학회지
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• 제13권1호
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• pp.19-25
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• 2009

This paper is a study on the link composition design of a double link type level luffing jib crane using path generation synthesis passing through three precision points according to parameters, the length of backstay, the ratio of fly jib length between two moving hinges to the total length of fly jib, the location of a intermediate passing point etc. when the maximum and minimum working radius of the crane are given. The performance of the crane depends on the deviation of the luffing trajectory at fly jib tip. The luffing trajectories according to the above parameters are analyzed and shown in graphs by the developed computer program. In a real-life design, some trials are needed to arrive at a proper link composition design. Therefore, it is expected that the present computer program can rapidly and exactly deal with a link composition design proper to the design criteria of the crane.

• 대한금속재료학회지
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• 제48권6호
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• pp.489-497
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• 2010

The remaining life estimation of the level luffing crane component, which has operated for about 20 years is examined carefully, especially on the crane structures. To analyse the crane sructures, the basic load and load combination needed to be considered. We modeled various parts of the level luffing crane to analyse fatigue. Fatigue analysis results showed that the level luffing crane is in the fatigue life so that the crane is in the safe state in fatigue cumulative damage. Analysis results show that the remaining life of a jib upper beam would be about 10 years therefore, the level luffing crane should be stable for fatigue for that period.

• 한국안전학회지
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• 제16권4호
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• pp.65-73
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• 2001

This paper is a study on the fatigue analysis using BS5400 Part10(1980), code of practice for fatigue for a double link type level luffing jib crane which has been operated since the crane was built in 1985 at a domestic pier. South Korea. In addition, on the basis of the design lift due to fatigue analysis and the number of cracks detected from the nondestructive test the structural reliability and the residual life of the crane is predicted by evaluating the expected development of detectable fatigue oracle during the next five to ten years using Paris's Law for predicting fatigue crack growth and Gaussian probability density function to be reasonable for stress ranges below the mean values determined by laboratory tests. The statistical data used for the analysis of the structural reliability and life expectancy is given in the above referred code.