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이재원(Jayone Lee),이성범(Seongbeom Lee),예수해(Soohae Ye) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Seat belt is the most fundamental safety device to protect passenger’s life from a clash or collision accident of vehicle. The role of seat belt system is preventing passenger from shock and getting out when the vehicle stops suddenly or turns over. Seat belt system consists of mainly four restraining parts: D-ring, buckle, anchorage, and retractor. Retractor is the major part which controls spool-in or out of webbing according to acceleration pulse in seat belt. Currently, spool of automotive seat belt is made of Al-alloy due to its light weight. In this paper, we performed solid model of spool using 3D scanner and CATIA V5. Moreover, for optimization of spool, we performed finite element analysis under various load between webbing and spool. In conclusion, we obtained optimized shape of automotive spool, and predicted fractural of spool through the result values of structural analysis.
박장수(Jangsoo Park),이재원(Jayone Lee),이성범(Seong Beom Lee),김흥섭(Heungseob Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The purpose of this paper is to compare with estimation of equivalent fatigue load in time domain and frequency domain. The fatigue analysis for random loads is discussed in several papers. In general, Equivalent fatigue load in time-domain is estimated by rainflow cycle counting. In case of frequency domain, it can estimate through probability density function of Dirlik`s method that directly use power spectrum density of stress. Probability density function of Dirlik`s method is function of spectral moment only. For verification of performance with two methods, simulations is performed with general random signal and FEM analysis.
서영욱(Youngwook Seo),손민혁(Minhyuk Son),이재원(Jayone Lee),이성범(Seongbeom Lee),김흥섭(Heungseob Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
There are various noises generated by friction. Expecially, reducing the disc brake squeal noise is an important technical issue in the automotive industry. Eliminating squeal noise generated during braking is an important task for the improvement of vehicle passenger comfort. Recent studies on brake squeal caused by a self-excited vibration phenomenon in brake systems forcused on reducing the squeal occurrence by changing the dynamic characteristics of brake components. In this study, CPF(Component Participation Factor) is used to quantify the influence of each component modes on the unstable mode. The least modification was proposed from the sensitivities to reduce the low frequency squeal noise. To verify this proposal, a reasonable finite element model was generated by correlating component and assembly modal tests. In processing correlation with component modal test, MAC(Modal Assurance Criteria) was used as a reference value for mode shape correlation. The experiment focused on squeal noise from vehicle tests on the noise dynamometer.