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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.
실험적 모드해석을 이용한 다물체계내 유연체의 변형모드 계산
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.
차체골격내 복합체 삽입을 이용한 구조기인 아이들 소음저감
김효식(Kim, Hyo-Sig),김중희(Kim, Joong-Hee) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.4
As a matter of fact, it has been not allowed to modify the shape of a vehicle body skeleton since the technical definition for the structure was fixed and the corresponding molds were developed. By the way, if it is available to apply an alternative to reinforce the skeleton without changing its mold, it must be much flexible to improve the performance qualities relevant to not only NVH(noise, vibration and harshness) but also crash and durability. Recently, a solution of so-called composite body becomes available for the need. We present a design method to insert the composite body inside a vehicle body skeleton in order to improve a structure-borne noise at the idle condition. The algorithms, topology optimization and design sensitivity analysis, are applied to mainly search the sensitive structural sections in the body skeleton and to extract the target stiffness of the sections. Inserting the composite bodies into the sensitive portions, it is predicted to achieve the countermeasures which can compromize the design availability in terms of the idle noise and weight. According to the validation result with test vehicles, the concerned noise transfer function is reduced and the idle booming noise is resultantly improved.