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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.
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.
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.