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기하학적 공분산(Geometric Covariance)을 고려한 변형 조립체의 공차 해석
소현철(Hyunchul So),김국생(Kuksaeng Kim),임현준(Hyunjune Yim),지해성(Haeseong Jee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Existing sensitivity analysis have done with assumption of independency of the sources of variation. But if the number of welding points is increased, we can see that the assembly variation will increase. This phenomenon is explained because as the number of sources increases the welding points are getting closer to each other and the independency assumption becomes questionable. Intuitively, closer points over the same surface cannot move independently of each other. Moreover intuition shows that if the number of welds increase, the assembly variation should decrease because the stiffness of the assembly increase with the number of welds and the springback will be smaller. So it can be concluded that the covariance among the sources of variation plays an important role in predicting the assembly variation.
이동열(Dongyul Lee),이재열(Jaeyeol Lee),김국생(Kuksaeng Kim),임현준(Hyunjune Yim),이규봉(Gyu Bong Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A methodology of analyzing dimensional variations of a subassembly has been developed. considering the effects of weld distortion and weld sequence. As an example, the tailgate of a sports utility vehicle has been considered. A complete thermo-elasto-plastic<br/> finite element analysis has been conducted to find the weld distortion. Using the results.<br/> tolerance analyses have been conducted to find the effects of different weld sequences. Variances of the measured dimensions on the subassembly have been found to be affected by the weld sequence. in spite of the small magnitudes of weld distortion.