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이태근(Tae-Keun Lee),김병삼(Byoung-Sam Kim) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.4
The vibration and disturbances from operating the compact disk layer have an effect on the play ability. As the excitation sources of the compact disk player, there are the vibration of the motors and gears, impact by mechanical parts and the external excitations. So, most of the compact disk player have a anti-vibrational system, which is included some rubber or oil dampers. In this study, the vibration characteristics of rubber damper which is used home compact disk player are investigated. The materials and shape of rubber damper are changed, and the transmissibility is measured. As a conclusion, the natural frequency is moved to higher frequency and the transmissibility is reduced by the increasing rubber stiffness. In comparison to butyl rubber damper, the transmissibility of silicon damper was increased by larger restitution elasticity. The hollow damper was effective to reduced the transmissibility.
스티어링 휠 다이나믹 댐퍼의 방진고무 강성 파라메터 연구
남재현,박기완,강재영 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.1
The purpose of this study is to determine the stiffness of rubber of dynamic damper. This damper system reduces the steering wheel vibration caused by idling oscillation of the engine. Therefore, in order to measure the stiffness of the silicone rubber in the dynamic damper system, the material test of the silicone rubber was carried out. Using the measured stiffness, the FEM model of the dynamic damper system was constructed and the correlation by the experimental data was shown at an error of less than 2%. In addition, the dynamic damper system was simplified to a two-degree-of-freedom spring-mass model and the effect of the stiffness change of the rubber on the natural frequency of the column shaft was analyzed theoretically. As a result, the amplitude of the column shaft was reduced as the stiffness of the silicone rubber was lowered.
김병삼(Byoung-Sam Kim),이태근(Tae-Keun Lee) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10
The vibration and disturbances from operating the compact disk layer have an effect on the playability. As the excitation sources of the compact disk player, there are the vibration of the motors and gears, impact by mechanical parts and the external excitations. So, most of the compact disk player have a anti-vibrational system, which is included some rubber or oil dampers. In this study, we investigated the vibration characteristics of rubber damper which is used home compact disk player. We changed the materials and shape of rubber damper, and measured the transmissibility. As a conclusion, the natural frequency is moved to higher frequency and the transmissibility is reduced by the increasing rubber stiffness. In comparison to butyl rubber damper, the transmissibility of silicon damper was increased by larger restitution elasticity. The hollow damper was effective to reduced the transmissibility.
고감쇠 고무와 강재를 사용한 이중감쇠 제진시스템의 내진성능
김정욱,김동건 대한건축학회지회연합회 2019 대한건축학회연합논문집 Vol.21 No.1
Recently, the frequency and magnitude of earthquakes are increasing worldwide. In Korea, the Gyeongju earthquake (2016) and the Pohang earthquake (2017) caused structural damage to many buildings. ISince Korea's seismic design standards were revised to three or more stories in 2005, five-story buildings built before the revision are not designed to be earthquake-resistant. In this situation, if strong earthquake occurs in Korea, there will be great damage. To prevent this, seismic retrofit of buildings should be necessary. The seismic retrofit of classical method is mainly used to reduce the displacement generated in the structure by strengthening stiffness and strength. However, since this method increases the base shear force of the structure, it is difficult to apply it to buildings which have weak foundation. Therefore, in this study, we propose the damper system that reduces the response displacement of buildings and suppresses the increase of base shear force by using high damping rubber and steel. And the seismic performance of the damper system is verified through the experiment and the seismic analysis of the structure. 최근 세계적으로 지진의 빈도와 규모가 증가하고 있다. 국내에서도 경주지진(2016)과 포항지진(2017)이 발생하여 많은 건축물에 구조적인 손상을 입었다. 우리나라의 내진설계 기준은 2005년에 3층 이상 건축물로 개정되었기 때문에 개정 전에 지어진 5층 규모의 건축물은 내진설계가 되어있지 않다. 이러한 상황에서 한국에 대규모 지진이 발생할 경우 큰 피해가 우려되며, 이를 방지하기 위해서는 건축물의 내진보강이 필요하다. 고전방식의 내진보강은 강성과 강도를 확보함으로써 구조물에 발생하는 변위를 감소시키는 방법을 주로 사용하였다. 하지만 이러한 방법은 구조물의 밑면전단력을 증가시키기 때문에 기초 내력이 부족한 건축물에는 적용하기 힘들다. 따라서 본 연구에서는 고감쇠 고무와 강재를 사용하여 건축물의 응답 변위를 감소시키고 밑면전단력의 증가를 억제하는 제진시스템을 제안하고자 한다. 그리고 구조물의 내진해석과 실험을 통해 제진시스템의 내진성능을 검증하고자 한다.
무인기용 진동 저감 마운트의 고무 감쇠 특성에 대한 연구
강찬휘,박현서,곽동기 국제문화기술진흥원 2023 The Journal of the Convergence on Culture Technolo Vol.9 No.6
In modern times, with advances in semiconductor technology such as electronic devices, the need to improve the quality of onboard equipment with advanced electronic parts in automobiles, drones, airplanes, projectiles, and various fields, and reduce the impact of various disturbances on onboard equipment is becoming more important. Vibration control through hardware must be determined to prevent damage and improve quality to equipment operating in various environments such as automobiles, drones, airplanes, and projectiles. This study focuses on the study of vibration damping systems to protect mounted equipment from various disturbances and improve stability. Dynamic characteristics analysis, including compressive stiffness, damping rate, and frequency response, and vibration characteristics in the frequency domain of rubber dampers were identified through FEM analysis to identify the characteristics of rubber dampers. Through these findings, we would like to present the criteria for selecting a suitable rubber damper under various disturbance conditions.
직접분사방식 디젤엔진의 6σ 기법을 적용한 비틀림 최적화에 대한 연구
김장수(Jangsu Kim),이치우(Chiwoo Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
Due to a low stiffness of cranktrain and a failure experience from a history within short development time, a viscous torsional vibration damper was applied in order to reduce the torsional vibration and keep the high reliability for the durability of cranktrain system in the direct injection diesel engine. As an improvement of the crankshaft stiffness by increasing the diameter of main and pin journal, a rubber type damper could be considered. In this study, the control factors of rubber damper, the moment of inertia ring, stiffness of damper and damping coefficient of ring, were investigated by DFSS method through the analysis work and the measurement in the real engine condition.
비선형 특성을 적용한 파워트레인 마운팅 시스템의 마운트 전달력 해석
김진훈(J. H. Kim),이수종(S. J. Lee),이우현(W. H. Lee),김정렬(J. R. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The primary objective of this study is to truly understand reaction force be due to engine exciting force. Exciting forces of the engine apply a source of the vehicle NVH(Noise, Vibration, Harshness). To understand reaction force was applied MSC.Nastran software. Analyzed frequency response analysis of powertrain mount system. First, engine exciting force was applied field function. Also nonlinear characteristics was applied field function : such as dynamic spring constant and loss factor. And nonlinear characteristics was applied CBUSH. Generally characteristics of rubber mount is constant frequency. But characteristics of hydraulic mount depend to frequency. Therefore nonlinear characteristics was applied. Powertrain mounting system be influenced by powertrain specification, mount position, mount angle and mount characteristics etc. In this study, we was analyzed effects of powertrain mounting system. And we was varied dynamics spring constant and loss factor of mounts.