• Title/Summary/Keyword: Vibration isolator

Search Result 210, Processing Time 0.033 seconds

Evaluation for Fatigue Life of Rubber Isolator for Vibration Characteristic on Automotive Cooling Module (진동 특성을 고려한 자동차 냉각모듈 방진고무의 내구성 평가)

  • Shim, Hee-Jin;Kim, Han-Chul;Kim, Jung-Kyu
    • Proceedings of the KSME Conference
    • /
    • 2008.11a
    • /
    • pp.350-355
    • /
    • 2008

  • A Rubber mount is widely used for mechanical parts or engineering materials. Especially, it plays an important role in reducing mechanical vibration due to cyclic loading. But, rubber mount is damaged due to the cyclic loading and resonance. Therefore, it is necessary to investigate evaluation of fatigue life considering vibration characteristics for rubber. In this study, a vibration fatigue analysis was performed and based on Power Spectral Density(PSD) and the stress-life curve and a result of frequency response analysis in the finite element method. The measured load history in experiment was transformed to PSD curve. The stress-life curve was obtained by nonlinear static analysis and fatigue test. In addition, frequency response analysis was conducted for mechanical part. In order to evaluate fatigue life of rubber mount, vibration fatigue test was conducted at the constant acceleration-level as well. Fatigue life was determined when the load capacity is reduced to 60% of its initial value. As a result, predicted fatigue life of rubber mount agreed fairly well with the experimental fatigue life.

  • PDF

The Development of a Floating Slab Track to Isolation System (플로팅 슬래브 궤도용 방진시스템 개발)

  • Park, Sang Gon;Koo, Hyung Wook;Han, Hyun Hee;Chun, Chong Keun;Jang, Seung Yup
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2013.04a
    • /
    • pp.636-641
    • /
    • 2013

  • Recently the construction of stations under railway lines and railway sections passing through central area of cities are increasing, calling for an urgent establishment of countermeasures against railway vibration and its subsequent second-phase noise. Of technology developed up to now, the most efficient countermeasure is the floating slab track, a track system isolated from the sub-structure by springs. Unfortunately, however, the system design technology and technology for key components have not yet developed in Korea. As such, in this study, the analysis and design technology of floating slab track and its vibration isolator technology can be achieved. In preparation for future demands, it is expected to raise awareness for the need of technology self-support and to make a meaningful contribution to mitigating vibration and noise produced by the next-generation high-speed railway.

  • PDF

Development of Isolators (Laminated Rubber Bearing) for the Seismic Isolation of LNG Storage Tanks (LNG 저장 탱크의 지진방지를 위한 면진베어링(LRB)의 개발)

  • 유춘화;김두훈;이동근;김남식;정우정
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1994.04a
    • /
    • pp.116-121
    • /
    • 1994

  • 지금까지 대형 구조물에 널리 사용되고 있는 Base Isolator는 특히, 지진하중에 대하여 상부 구조물의 지반분리(base isolation)을 이용한 지진제어를 목적으로 하기 때문에 Seismic Isolator라 한다. 일반적으로 면진베어링에는 LRB(Laminated Rubber Bearing) 방식과 R-FBI(resilient-friction base isolator) 방식으로 크게 나눌 수 있다. LRB 방식은 가장 널리 사용되는 면진베어링으로써 방진고무를 주된 재료로 하고 수직강성을 보강하기 위하여 steel plate를 조합하여 제작하며, 초기강성 및 에너지 소산능력을 증가시키기 위하여 단면중앙에 납(lead plug)를 삽입하기도 한다. R-FBI 방식은 방진고무 적층판 내부에 미끄럼판을 가지고 있으므로 LRB 방식에 비하여 더 큰 수평변위를 발생시킬 수 있다. 이번에 설계 제작한 면진베어링은 LNG 저장탱크의 Seismic Isolation을 목적으로 적용대상의 사양에 맞추어 설계 제작하고 성능평가 시험을 수행하여 LNG 저장탱크, 원자로, 대형 건축물등 지진으로부터 보호되어야 하는 대형구조물의 방진재로 적용할 수 있는가를 평가하고자 한다. 본 논문에서는 제작된 면진베어링의 설계를 검증하고 방진고무(HDR)재료의 물리적 특성시험, 축소모델에 의한 정적, 동적시험을 통하여 시험방법을 소개하고 이러한 시험결과를 기초로 하여 면진베어리의 성능을 평가하였으며, 면진베어링의 온도변화, 외부 수직하중의 변화등에 따른 특성변화와 LNG 저장탱크와 면진베어링의 체결방법에 따른 시험으로 체결방법을 검증하였으며, 대상물의 사양에 적합한가를 고찰하였다.

  • PDF

Experiment for Position Accuracy Using Laser Scale Unit with 10 Nano-Meter Resoultion (10 nano-meter 분해능을 갖는 laser scale을 이용한 위치 결정 실험)

  • 임선종;정광조;최재완
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.1
    • /
    • pp.21-26
    • /
    • 2000

  • This paper describes a positioning system for ultra-precision that will be utilized in semiconductor manufacturing field and precision machinery. This system is composed with laser scale unit with 10nm resolution, ball screw with LM guide, brushless DC servo motor, vibration isolator and is equipped in chamber for continuous measuring environment. The dynamic of table, the problem of servo control and the traceability for micro step motion are described. These data will be applied for getting more stable system with 50nm resolution.

  • PDF