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디스크 브레이크 허브 볼트의 억지 끼워 맞춤에서 발생하는 소성변형의 해석
이요셉(J. S. Lee),곽시영(S. Y. Kwak),강신일(S. Kang) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.6
A brake system in automobile is one of the important parts that directly affect the safety of passengers. Particularly, disk brake module is applied to almost all kinds of automobile brake system due to its remarkable braking power and braking distance. In the disk brake module of an automobile, the bolt for tire wheel is assembled to the disk brake hub by interference fit (bolt pressing process). The process induces small deformation whose range is within tens of ㎛ and this deformation may cause the runout badness of the whole disk brake module, and even braking problems such as judder or squeal phenomena which makes the loss of braking efficiency. In this study, bolt pressing fit into hub was simulated by ANSYSTM, a commercial structure analysis program. Also, the aspect and the cause of hub displacement were analyzed and the solution for decreasing runout of hub was proposed.
Yin Song,곽시영(S.Y. Kwak),황호영(H.Y. Hwang) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.3
The safety valve is an essential device for high-pressure equipment; because high-pressure equipment is used in many fields, the use of safety valves is also increasing. Safety valves are used in various fields such as the petroleum industry, power plants, and nuclear power industries. In the 19th century, many boiler explosion accidents occurred due to improper boiler design or the failure of safety valves used in boilers. These incidents drew the attention of the US government, and the American Society of Mechanical Engineers (ASME) enacted the first ASME code for safety valves in response to government requirements. A safety valve is a device used to protect high-pressure systems and people from accidents, and because of its importance, many related studies have been conducted, and related standards are continuously being updated. In actual safety valve experiments, it is difficult to observe the characteristics of fluid flow. In this study, the opening process of a safety valve under high pressure was studied using a simulation method. Analysis was conducted using the commercial software COMSOL Multiphysics and the fluid–structure interaction (FSI) technique. The FSI is calculated by reflecting the interaction between a structure and fluid and is a suitable method for analyzing the safety valve operation process. Two shapes that can reduce flow resistance were designed by analyzing the simulation results and the same flow analysis was performed on these shapes. By comparing the proposed shape’s simulation results with those of existing shapes, it was confirmed that the pressure loss was reduced in the improved method, and the flow rate was further increased due to a relatively low pressure loss. This means that the fluid inside the pressure vessel can be discharged faster and the pressure can be lowered faster, so it was determined that the improved shape safety valve showed better performance.