Abstract
Door hinges of a large refrigerator employ a complicated mechanism in combination with crank-rockers and slide-cranks to help the doors open and close smoothly. The main frame of the hinge covering the mechanism part should support the weight of the door along with food loaded on it, and endure impact load due to the opening and closing movement of the door. Thus, the door hinges should be designed such that the mechanism part is smoothly operated and the main frame has the required strength without significantly increasing the weight. For this purpose, the deterministic design optimization (DDO) of door hinges has been studied, but it does not guarantee desirable reliabilities in the design results. In this research, reliability-based design optimization (RBDO) was carried out to obtain a more reliable design than the DDO. By comparing the RBDO results with the DO results, it was found that the RBDO results had slightly larger door weights than the DDO results, but provided much larger reliabilities. The entire process of analysis and design optimization were automated using PIDO(Progress Integration and Design Optimization) technology, where Excel was used to analyze the mechanical behavior of the hinge and ANSYS was used to carry out crash analysis.
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