Consideration of the Lifting Lug Structure using the Hybrid Structural Design System

J. Ocean Eng. Technol. 2009;23(2):104-109.

Ham Juh-Hyeok,Kim Dong-Jin

Department of Computer-aided Engineering Halla University,Department of Computer-aided Engineering Halla University

하이브리드 구조설계 시스템을 이용한 선박블록 탑재용 러그구조 고찰

함주혁,김동진

한라대학교 컴퓨터응용설계학과,한라대학교 컴퓨터응용설계학과

Keywords: Lifting lug, Shackle pin, Structural analysis, Lug strength, Optimum structural design, Hybrid structural design system

핵심용어: 탑재용 러그, 셔클 핀, 구조해석, 러그 강도, 최적 구조설계, 하이브리드 구조설계시스템

Abstract

In the view of the importance of material reduction due to the jump in oil and steel prices, an optimized structural system for lifting lugs was developed. Such a system is needed hundreds of thousands of times a year. A direct design process was added to this developed optimized system to increase the design efficiency and provide a way of directly inserting a designer's decisions into the design system process. In order to verify the system efficiency and convenience, several new prototype lug shapes were suggested using the developed system. From these research results, it was found that the slope of the main plate of the lug structure has a tendency to move from about 45 degrees to about 60 degrees and the design weight was reduced from an initial value of about 32kgf to about $15{sim}19kg_f$ after the redesign. Based on these initial research results, an efficient reduction in steel weight was expected considering the enormous consumption of lug structures per year. Additionally, a more detail structural analysis through local strength evaluations will be performed to verify the efficiency of the optimum structural design for a lug structure.