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실험 4단자정수를 이용한 저소음 흡기계의 강건 최적 설계
조용구(Joe, Yong-Goo),오재응(Oh, Jae-Eung),이유엽(Lee, You-Yub),김흥섭(Kim, Heung-Seob) 한국소음진동공학회 2002 한국소음진동공학회 논문집 Vol.12 No.6
Recently, regulations of the government and concerns of people give rise to the interest in exhaust and intake noise of passenger car as much as other vehicles. In these demands, performance prediction software with hybrid method was developed at first. Secondly, robust design was used for improving the noise reduction capacity of intake system with the performance prediction software. On the basis of the existing design, length and radios of each component that was thought to effect on the capacity of intake system was selected. The factors were arranged by using L18 table of orthogonal array and optimum value was obtained.
마찰기인 접촉 강성을 가지는 2-자유도계 면외 방향 진동 시스템의 선형 안정성 해석
조용구(Joe, Yong-goo),신기홍(Shin, Ki-hong),이현영(Lee, Hyun-young),오재응(Oh, Jae-Eung),이수갑(Lee, Su-Gab) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.3
A two-degree-of-freedom out-of-plane model with contact stiffness is presented to describe dynamical interaction between the pad and disc of a disc brake system. It is assumed that the out-of-plane motion of the system depends on the friction force acting along the in-plane direction. Dynamic friction coefficient is modelled as a function of both in-plane relative velocity and out-of-plane normal force. When the friction coefficient depends only on the relative velocity, the contact stiffness has the role of negative stiffness. The results of stability analysis show that the stiffness of both pad and disc is equally important. Complex eigen value analysis is conducted for the case that the friction coefficient is also dependent on the normal force. The results further verify the importance of the stiffness. It has also been found that increasing the gradient of friction coefficient with respect to the normal force makes the system more unstable.
2자유도계 모델을 이용한 디스크 브레이크 스퀼 소음에 대한 댐핑의 영향에 관한 연구
신기홍(Shin, Ki-Hong),조용구(Joe, Yong-Goo),오재응(Oh, Jae-Eung) 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.12
A two-degree-of-freedom model is suggested to describe basic dynamical behaviors of the interaction between the pad and the disc of a disc brake system. Although a pad (and a disc) has many modes of vibration in practice, only one mode of each component Is considered. In this paper, a linear analysis is performed by means of the stability analysis to show various conditions for the system to become unstable, and is based on the assumption that the existence of limit cycle (this corresponds to an unstable equilibrium point inside the limit cycle) represents the squeal state of the disc brake system. The results of the stability analysis show that the damping of the disc is as much Important as that of the pad, whereas the damping of the pad only is considered In most practical situations.
크리깅기법을 이용한 전륜 디스크 브레이크 모델의 스퀼 저감 해석
심현진(Hyoun-Jin Sim),조용구(Yong-Goo Joe),NOOR FAWAZI,오재응(Jae-Eung Oh) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Disc brake noise is an important customer satisfaction and warranty issue for many manufacturers as indicated by technical literature regarding the subject coming from Motor Company. This research describes results of a study to assess disk brake squeal propensity using finite element methods and optimal technique (Kriging). In this study, finite element analysis has been performed to determine likely modes of brake squeal. This paper deals with friction-induced vibration of disc brake system under contact friction coefficient. A linear, finite element model to represent the floating caliper disc brake system is proposed. The complex eigen-values are used to investigate the dynamic stability and in order to verify simulations which are based on the FEM model. In this paper, Kriging from among the meta-modeling techniques is proposed for an optimal design scheme to reduce the brake squeal noise.
이충휘(Choong-Hwi Lee),조용구(Joe Yong-Goo),이유엽(You-Yub Lee),오재응(Jae-Eung Oh),이정윤(Jung Youn Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The method of the reduction of the induction noise can be classified by the method of passive control and the method of active control However, the passive control method has a demerit to reduce the effect of noise reduction at low frequency (below 500Hz) range and to be limited by a space of the engine room. Whereas, the active control method can overcome the demerit of passive control method, The algorithm of active control is mostly used the LMS (Least-Mean-Square) algorithm because the LMS algorithm can easily obtain the complex transfer function in real-time. Especially, Filtered-X LMS (FXLMS) algorithm is applied to an ANC system However, the convergence performance of LMS algorithm goes bad when the FXLMS algorithm is applied to an active control of the induction noise under rapidly accelerated driving conditions. So, this study demonstrates the modified FXLMS algorithm and improves the control performance to reduce the automotive induction noise under the rapidly accelerated driving conditions.