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Modal Superposition Method를 이용한 MPV 차량의 내구해석
송대준(Dae Jun Song),서진관(Jin Kwan Suh) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
Modal Superposition Method (MSM) makes it possible to estimate the fatigue life of vehicle components using modal transient analysis, in which the load history of a real vehicle is imposed to obtain the dynamic response. The MSM has advantages of computing time and evaluation method compared with other methods developed for fatigue life prediction. Moreover, the MSM may provide a reliable result. To verify the reliability of the MSM, comparisons have been made between numerical results and experimental data measured in Belgian fatigue test of Multi Purpose Vehicle(MPV). It is demonstrated that the MSM shows a reliability of the fatigue life prediction for vehicle components.
Modal Superposition Method를 이용한 MPV 차량의 내구해석
송대준(Dae Jun Song),서진관(Jin Kwan Suh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Modal Superposition Method (MSM) makes it possible to estimate the fatigue life of vehicle components using modal transient analysis, in which the load history of a real vehicle is imposed to obtain the dynamic response. The MSM has advantages of computing time and evaluation method compared with other methods developed for fatigue life prediction. Moreover, the MSM may provide a reliable result. To verify the reliability of the MSM, comparisons have been made between numerical results and experimental data measured in Belgian fatigue test of Multi Purpose Vehicle(MPV). It is demonstrated that the MSM shows a reliability of the fatigue life prediction for vehicle components
형상변경에 따른 구조물 감쇠특성 및 소음 특성 예측기술 연구
유지우(Ji Woo Yoo),서진관(Jin-Kwan Suh),이상우(Sang Woo Lee),박정원(Jong Won Park),박준홍(Jun Hong Park) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Applying damping sheets or dampers (dynamic or mass) can reduce noise from vibrating structure as well as vibration. However, this approach requires increases of weight and cost. If one can reduce structural noise by only modifying the structural shape, which would be the best practice. It is natural that the noise characteristics change when the structure is modified, but the recent experiment on the sunroof frame showed that the modification of the frame beads results in change of the structural damping, so that the corresponding noise can be reduced. In this context, the reason why the structural damping and the related noise upon an impact excitation is changed is theoretically investigated. The change of dynamic and damping characteristics of the strip panels when their shapes are modified is experimentally found and it is shown that such behaviours can be predicted by computer simulation. Some experimental specimen, mainly striptype panels, are examined for the numerical verification, and especially damping ratios are investigated.
방사소음 및 투과소음에 대한 승용차량 대시패널의 설계인자별 영향도분석
유지우(Ji Woo Yoo),채기상(Ki-Sang Chae),박철민(Chul-Min Park),서진관(Jin Kwan Suh),이기용(Ki Yong Lee) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
A dash panel component, close to passengers, plays a very important role to protect heat and noise from a power train. Meanwhile, it is also a main path that transfers vibration energy and eventually radiates acoustic noise into the cavity. Therefore, it seems important to provide an optimal design scheme incorporating sound packages such as dash isolation pad and carpet, as well as structures. The present study is the extension of the previous investigation how design variables affect sound radiation, which was carried out using the simple plate and framed system. The system taken into account in this paper is a dash panel component of a sedan, which includes A pillar, front side member, dash panel and the corresponding sound packages. Design variables such as panel thickness and sound package layers are investigated how they are related for the better radiation performance (i.e. structure-borne) and sound transmission loss (i.e. air borne).
방사소음 및 투과소음에 대한 승용차량 대시패널의 설계인자 별 영향도 분석
유지우(Yoo, Ji-Woo),채기상(Chae, Ki-Sang),박철민(Park, Chul-Min),서진관(Suh, Jin-Kwan),이기용(Lee, Ki-Yong) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.1
While a dash panel component, close to passengers, plays a very important role to protect heat and noise from a power train, it is also a main path that transfers vibration energy and eventually radiates acoustic noise into the cavity. Therefore, it is important to provide optimal design schemes incorporating sound packages such as a dash isolation pad and a floor carpet, as well as structures. The present study is the extension of the previous investigation how design variables affect sound radiation, which was carried out using the simple plate and framed system. A novel FE-SEA hybrid simulation model is used for this study. The system taken into account is a dash panel component of a sedan vehicle, which includes front pillars, front side members, a dash panel and corresponding sound packages. Design variables such as panel thicknesses and sound packages are investigated how they are related to two main NVH indexes, sound radiation power(i.e. structure-borne) and sound transmission loss(i.e. air borne). In the viewpoint of obtaining better NVH performance, it is shown that these two indexes do not always result in same tendencies of improvement, which suggests that they should be dealt with independently and are also dependent on frequency regions.