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김효식(Hyo-Sig Kim),김상섭(Sang-Sup Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This paper presents a computational method for deformation modes of a flexible body in multibody<br/> system from the experimental modal analysis and an efficient method for flexible multibody dynamic analysis<br/> by use of the modes. It is difficult to directly use experimental modal parameters in flexible multibody<br/> dynamic analysis. The major reasons are that there are many inconsistencies between experimental and<br/> analytical modal data and experimental noises are inherent in the experimental data. So two methods, such as,<br/> a method for ortho-normalization of experimental modes and the other one for mode expansion, are suggested<br/> to gain deformation modes of a flexible body from the experimental modal parameters. Using the virtual work<br/> principle, the equation of motion of a flexible body is derived. The effectiveness of the proposed method will<br/> be verified in the numerical example of cab vibration of a truck by comparing analysis and test results.
Hyo-Sig Kim(김효식),De-Kerdrel Taneggy,Hee-Jin Kim(김희진) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An efficient application of computational models for trimmed body development in a vehicle development process, considering the characteristics of computational models and design concerns in each development stage, will be proposed. The conventional approach using full finite element models have been applied to make a design and pre-validation for interior noise. From stage to stage, however, it is different for designer to make a concern, and to make a decision which is depend on development stages. So, it is necessary to study efficient applications of computational models according to design stages. An analysis using QFD(Quality Function Deployment) is carried out to compute and compare the effectiveness of three kinds of models. A new application with the best combination of models through the whole process is proposed. This proposed one consists of the FEM substructure synthesis model(FEM+FEM) at the design stage, the hybrid one(FEM+Test) at the proto-validation stage and the test based one(Test+Test) at the pilot-validation stage. According to the result of QFD, it is 1.49 times more efficient to use the new application than the conventional one. Finally, three experiences are introduced in order to verify the effectiveness of the proposed application.
김효식(Hyo-Sig Kim),조남걸(Nam-Gul Cho) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
This paper considers the computational simulation method to estimate the durability of a vehicle body at an early stage in the design cycle. There are three fundamental steps In this simulation approach. The first step is to measure the acceleration, which will be used at the next step, of a vehicle body on the Belgian<br/> block. The second step is to define the dynamic environment of a global body and frame and to estabilish the load-stress relation of a local area. The final step is to determine the life prediction of the local area.<br/> <br/> <br/>
김효식(Hyo Sig Kim),김창부(Chang Boo Kim),임홍재(Hong Jae Yim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
This paper presents a computer-integrated method for durability of a vehicle body structure. The proposed method gains the optimal design of the body structure through iterative cycles of two phases. The first phase is for durability estimation cycle, which is carried out by use of a computational durability analysis. The other one is for durability design cycle, which is executed by use of optimal design method. The final optimal design is resulted from several iterations of two cycles. The effectiveness of the proposed methodology is verified to be applied the durability confirmation of the developed body structure in a prototype bus.