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Running mode test 를 이용한 대형버스 동적 특성 연구
김충완(Chungwan Kim),오태석(Taeseog Oh),김화영(Hwayoung Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fatigue failures of vehicle body structure in durability test have been considered local problems caused by notch (e.g. poor design), defect in welding and deficiency of strength. The solution of these problems relied heavily upon adding the reinforcement, increasing the size and thickness. Above often results in over-design and increasing time for vehicle development in body durability test. The fatigue failures of body structure mostly cause of global problem, not local. There are two cases of global problem; one is sharp change in stiffness - discontinuous static stiffness, the other is resonance of body structure - dynamic stiffness. Running mode test is a well-understood and widely accepted tool for troubleshooting vibrational, acoustical and fatigue problems. In terms of road simulator, the running mode test of full trimmed-body enables to solve the durability problems caused by resonance of vehicle body in a short time. The mode analysis of vehicle system (e.g. suspension, engine, body) for the causes and counterproposals of fatigue failures is necessary.
Field 기준노면을 이용한 버스 내구시험기간 단축기법 개발
김충완(Chungwan Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Durability test is that complete vehicles endures various load in severe and different field driving condition. The test engineers come up to customer's expectations of vehicle durability performance and function through this test. The durability test of complete vehicles is classified according to proving ground. First, accelerated durability test using Belgian and Pothole road verify the structural defect of body structure and the performance change of chassis parts. Second, Cross country road constructed as paved road, broken concrete road, rough road, slalom etc verify the global quality of vehicle. Third, Road simulation test using road simulator has the same target as accelerated durability test. These three test is difficult full vehicle adjusting the damage at a same rate to respective the sub system. Eg. Body, Chassis, Mounting system, etc. So, It is hard to correlate a proving ground between customer field condition.<br/> This development use process as deletion of non-damage road, scaling and compressing of road profile in a same damage rate for shortening test period and the method of selection of standard field road. The good reliability of the road simulator could perform durability test and develop the customer usage standard road profile. This field road simulation test during 4 months guarantees durability for 7 years 700,000㎞ in field driving condition. Accurate field correlation and optimum vehicle design is possible through this test and local test is possible instead of export area test.