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Isolating Vibration in Miniature Linear Cryogenic Cooler with Tuned Vibration Absorber

동조질량 진동흡수기를 이용한 미니 저온쿨러의 진동 절연

  • Received : 2009.12.28
  • Accepted : 2010.03.05
  • Published : 2010.05.01

Abstract

In modern surveillance equipment, infrared (IR) sensors are essential for detection and observation. The IR sensor is connected to a miniature cryogenic cooler to maintain the temperature at very low levels, i.e., temperatures as low as 77 K. However, the quality of the image captured by the sensor is degraded by the transmission of vibration disturbances from the cooler. Therefore, to maintain high image quality, the compressor vibration and the force transmitted to the sensor have to be mitigated. For the compressor vibration isolating system, a tuned dynamic vibration absorber, combined with a passive isolator, is proposed. A cryogenic compressor bracket and springs are designed to allow the absorber mass to mitigate the vibration jitter in the axial direction. The system design is analyzed and evaluated in terms of the dynamic suppression of the harmonic force at the operating frequency of the cooler.

적외선 센서를 사용하는 최신 관측용 장비들을 저온으로 유지하기 위해서는 극저온 컴프레서를 센서에 연결한다. 그러나 컴프레서 진동원으로부터 발생한 외란 힘에 의해 취득 영상 품질이 저하된다. 따라서 고품질의 영상을 얻기 위해 극저온 쿨러에 대한 진동 절연 설계가 필요하다. 본 논문은 수동 진동 절연 방법의 장점을 사용하면서 컴프레서 외란 진동에 대한 높은 절연 성능이 있는 시스템을 연구 및 설계하는 것이다. 수동 진동 흡수기는 컴프레서의 구동 주파수를 고려하여 설계했다. 또한, 특정 외란 진동과 고주파수의 진동도 절연되는 쿨러 절연 브래킷을 설계하였고, 성능 분석을 위한 실험을 수행하였다.

Keywords

References

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