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실제 접촉 마찰면 모델을 이용한 제동 스퀼 소음 해석 정합성 향상에 관한 연구
황재근(Jaekeun Hwang),김정규(Jeongkyu Kim),김성호(Sungho Kim),강동훈(Donghoon Kang) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Brake squeal noise comes from the complex phenomenon of the disc and the friction interface. In fact, even in the friction material of the same shape, the noise characteristics are different depending on the friction interface pattern. However, the current squeal noise simulation does not reflect the effects of these friction interfaces, but only the friction coefficient and braking pressure are used to realize the phenomenon. Therefore, the reliability of the complex eigenvalue analysis result is inevitably lowered. In this study, the complex eigenvalue analysis is performed by reflecting the actual shape modeling technique of the friction interface, and the validity of the improved analysis method is verified through the test. The friction surface modeling technique of this study is designed to randomly generate the friction interface of the analytical model by measuring the shape (shape, waveform, roughness) of the actual friction surface. In order to express the actual friction surface shape in the analytical model, the friction layer size is also compactly constructed. Surface patterns of manufacturers and materials were analyzed for friction materials of the same shape, and the test and analysis results for the samples were compared. As a result of noise evaluation, the shape of the friction material is the same, but the squeal noise tends to be completely different according to the friction interface pattern. An analysis model similar to the friction interface pattern of each friction material used in the test was constructed, and the results of the complex eigenvalue analysis showed similar results. Therefore, it can be confirmed that the complex frictional application method with the actual friction surface can yield similar results with the actual phenomena. In addition, this study analyzed the spread on the brake system using random friction interface models. In case of using random friction interface, the squeal noise reproducibility tends to be higher than that of the case
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GDI 엔진용 고압 연료 펌프 설계를 위한 밸브의 유동 특성 해석
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),신외경(Waegyeong Shin),황재근(Jaekeun Hwang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
High pressure fuel at about 20 MPa is injected into the engine cylinder. At a GDI system, it is a technology to reduce emission and to improve engine output and fuel efficiency at the same time. But, this system requires an additional high pressure fuel pump with a low-pressure fuel pump that is used to a PFI(Port Fuel Injection) engine. The purpose of this paper is to investigate the performance characteristics of the main valves of a high pressure fuel pump for GDI engine. The flow characteristics of inlet/outlet check valves and a relief valve of high pressure fuel pump were analyzed by CFD method. The flow rate of the inlet/outlet check valves are decided by the valve openings. Therefore the flow characteristics of the inlet/outlet check valves were analyzed according to the valve openings and inlet/outlet pressures. In case that high pressure abnormally occurs at the injector part, the relief valve begins to work. The bypass flow rate of the relief valve according to inlet and outlet conditions of the valves was analyzed.
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실험계획법을 이용한 GDI연료펌프의 맥동저감을 위한 댐퍼 최적설계
김주영(Juyeong Kim),노진이(Jinyee Noh),이종욱(Jongwook Lee),김경남(Kyungnam Kim),박형종(Hyoungjong Park),황재근(Jaekeun Hwang),이연홍(Yeonhong Lee),윤길호(Gilho Yoon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study optimizes the profile of the diaphragm of a pressure pulsation damper structure in a high-pressure GDI engine system which is now under development by applying the design of experiment (DOE). As a high pressure pulsation ranging from 0 to 10 Bar deteriorates the performance of GDI engine, it is necessary to attenuate the large amplitude of fluid pulsation pressure of Gasoline fuel directly injected into GDI engine. In the development of this pressure damper, it becomes an issue to design optimal profiles of the enveloping diaphragms in terms of pulsation efficiency and mechanical stress for the sake of safety. Thus, this research develops a new finite element procedure considering the internal pressure variation by assuming the isoenthalpy state of the enveloped Helium gas inside the damper and integrates the iterative finite element procedure with the design of experiment (DOE).
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