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신준탁(Jun Tak Shin),유연상(Yeon Sang Yoo),김성겸(Sung Kyeom Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
There are several test modes (CFT, RFT, Impact Test) for aluminum wheel to prove its performance. HMC (Hyundai Motor Company) Chassis CAE Team has been developing wheel analysis which has been correlated with tests. The aluminum wheel material properties(Strength, Durability) which apply to CAE are gotten from specimen tests. Using Flow-Forming Process in manufacturing aluminum wheel is on the increase recently. According to studies and papers, aluminum wheel which apply to Flow-Forming Process has higher mechanical properties(Strength, Durability, Elongation etc.) than aluminum wheel which is not apply to. But, we have not gotten the durability material property in aluminum wheel which apply to Flow-Forming Process. Because, rim of aluminum wheel which apply to Flow-Forming Process is too thin to get the specimen. In this paper, to get the durability material property of aluminum wheel which apply to Flow-Forming Process, we propose the ‘Rim Specimen Test’ instead of common specimen test. From the results of ‘Rim Specimen Test’ and using CAE, we get the durability material property of aluminum wheel apply to Flow-Forming Process. Also, we are able to compare the durability material property of Flow-Forming Process and Non-Flow-Forming Process.
필댐 기초지반 보강에 따른 침투수량의 물리적 변화 분석
이태근 ( Lee Tae-geun ),정해상 ( Jeong Hae-sang ),유연상 ( Yoo Yeon-sang ),한동석 ( Han Dong-seok ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
필댐에서의 침투수량 관리는 댐 운영 및 유지관리에 있어서 매우 중요한 사항으로 댐체 내 침투수에 따른 안정성 검토 등 판단 근거로 활용할 수 있다. 본 장에서는 침투수량 관리 개선 조치를 완료한 댐시설을 대상으로 최근 정밀안전진단 시 개선 조치 적정 여부 판단을 위한 침투수량의 물리적 변화 정도를 분석하여 과거 자료와 비교하고 그 결과를 토대로 기초지반 보강공사에 따른 침투수 집수기능 회복 효과를 판단한 결과를 정리하였다.
이태근 ( Lee Tae Geun ),최홍석 ( Choi Hong Seok ),임대웅 ( Lim Dae Woung ),유연상 ( Yoo Yeon Sang ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
The purpose of measuring a dam operated after design & construction is to properly operate reservoir and maintain dam structural safety by comparing the really measured data for the behavior of dam with the data for design & construction, the past mesured data and analyzing them. In this paper, the really measured data is analized for a dam facilitiy located near a seismic epicenter of earthquake that occurred on 12th, Nov. 2016 in Gyeong-ju and the results of safety inspection for a dam is shown by comparing the behavior of dam before and after occuring earthquake.
스틸 휠 굽힘 모멘트 내구시험의 내구신뢰성 개선에 대한 연구
정수식(Chung Soo Sik),정원욱(Jung Won Wook),유연상(Yoo Yeon Sang),강우종(Kang Woo Jong),김대성(Kim Dae Sung),권일기(Kwon iL Ki) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The failure mode of steel road wheels in a vehicle is cracks from ventilation hole through to contact plane on steel wheel’s disc plate. But a number of cracks of Cornering Fatigue Limit Test is on contact plane near to wheel nut mounting area, even though it’s satisfied with specified cycles. So this paper searches out causes to improve durability and reliability of C.F.T by uni-axial bending moment test. The verified cause is a “fretting” on contact area of steel wheel. In result, this paper suggests a solution to prevent a fretting by inserting a damping shim, 0.7㎜ between steel wheel contact areas. Therefore this paper makes it possible to move crack position of C.F.T in steel wheel from contact plane to vehicle’s failure mode.