This study examines the optimum shape of a trolley, the driving device of the retractable membrane roof. The closed-type trolley was determined as the model of the study, and a trolley composed of cylindrical-shaped inner and outer holders was selected as the basic model. Based on this model, a cylindrical-based optimal trolley model was proposed. In the basic trolley model, steel was used for the outer holder, and steel, titanium, and aluminum were used for the inner holder. In each case, the most economical shape for the external load of the basic model was newly proposed through the topology optimization process, and the finite element analysis results of the proposed model were compared to define the durability and economics. Here, topology optimization analysis and finite element analysis used the commercial software ANSYS. As a result of optimization, the volume of the outer holder of the trolley was reduced by 58.2% and the volume of the inner holder was reduced by 25.0% compared to the basic model. In the case of stress, a stress increase of 43.2 to 79.2% occurred depending on the material of the inner holder, but it was found to be significantly lower than the yield strength, thereby ensuring safety.

Middle size of membrane retractable roof is under 25m span which consists of various moving systems. Trolley is the system that leads the membrane to parking place, transferring the load from the membrane to structural cable. When membrane closes roof completely, thus, structural behavior of trolley, which may contain various material with different friction coefficients, should be investigated by vertical load. Nummerical simulation of trolley prototypes, in this research, was performed by incrementation of vertical load. Consequently, this paper studied proper friction characteristics and provided the effective inner materials of trolley.

컨테이너 크레인은 컨테이너터미널에서 사용되는 주요 장비면서 컨테이너 크레인의 효율은 컨테이너터미널의 생산성을 결정한다. 컨테이너 크레인의 전형적인 유형은 싱글 트롤리를 가지고 있으며 진보된 유형들 중의 하나가 듀얼 트롤리형이다. 본 논문의 목적은 컨테이너 터미널에서 듀얼 트를리형 컨테이너 크레인의 버퍼 사이즈를 분석하는 것이다. 듀얼 트롤리형 컨테이너 크레인의 버퍼 공간을 분석하기 위한 시뮬레이션 모델을 소개한다. 버퍼 공간은 해측의 메인 트롤리와 야드측의 세컨 트롤리 사이에 위치한다. 요구 생산성을 추정하기 위해 다양한 시뮬레이션 실험을 수행하여 버퍼 사이즈를 분석한다.