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김영하(Young-Ha Kim),김규식(Kyu-Sik Kim),김진목(Jin mok Kim),강연준(Yeon June Kang),김찬묵(Chan mook Kim),이재운(Jae woon Lee),김의제(Ui je Kim),홍성규(Sung kyu Hong) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper explores the feasibility of estimating the sound pressure level (SPL) in a vehicle compartment when the attachment stiffness (i.e., the local stiffness of the connecting point at which operational force is applied) is changed. The FRF-based synthesis (FBS) technique and FRF-based substructure identification method are used to estimate the change in attachment stiffness and simulate noise transfer function (NTF). The proposed methods are verified by comparing the estimated NTF with the measured results when the stiffness of the attachment is increased by connecting an additional beam to that attachment is required to estimate the SPL in the vehicle compartment, a transfer path analysis (TPA) is also performed to calculate the force data. The sound pressure levels in various operating conditions are estimated ultimately by using force data from the TPA procedure and the NTF estimated from the FBS technique.
[論文] Curved Taper Leaf Spring의 動特性에 關한 硏究
김찬묵(Chan-Mook Kim),김광식(Kwang-Sik Kim) 한국자동차공학회 1981 오토저널 Vol.3 No.1
In this paper, the natural frequencies of curved taper leaf springs using on vehicle suspen-<br/> sion systems are studied.<br/> By applying the Castigliano’s definition, Rayleigh’s principle and Dunkerley’s equation,new for-<br/> mulas defining the natural frequency of such shaped spring are derived.<br/> Numerical calculations are in very good agreement with experimental results on actual mo-dels. We found that the natural frequencies of curved taper spring are increased by 21-28 % compared with the spring having same weight, span and curve but uniform section.<br/>
모터 토크리플에 기인하는 전동식 조향장치 시스템의 조향감 해석에 대한 연구
김찬묵(Chan-Mook Kim),한정훈(Jeong-Hun Han) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
This paper presents the effects of an assisting motor torque ripple on a driver’s steering feeling using a simulink. The EPS(Electric Power Steering) System is modeled as a 5 degrees of freedom for simulation. To find out the influence of a torque ripple on a driver’s steering feeling, which is the purpose of this study, we observed the assisting torque in various different speeds, when the torque ripple increased by 0%~40%. The torque ripple had a small but definite influence on the assisting torque, and it had a greater influence in low speeds rather than high speeds.