• 한국항공우주학회지
• /
• 제40권3호
• /
• pp.237-242
• /
• 2012

극저온이 요구되는 우주용 탑재장비의 냉각을 위해 일반적으로 Pulse Tube-type 압축기가 적용되고 있으며, 궤도상에서 압축기의 냉각성능, 임무수명 및 비대칭 온도분포에 의한 미소진동발생 방지를 위해 압축기를 허용온도 범위로 유지하는 열제어가 필요하다. 압축기는 궤도 운용 시 미소진동을 발생하여 관측성능이 요구되는 탑재체의 지향성능을 저하시키는 원인으로 작용한다. 본 논문에서는 압축기의 미소진동 방지를 목적으로 적용된 진동절연기의 성능유지 및 압축기의 허용온도범위 유지를 위한 열제어 성능을 동시에 만족하는 우주용 압축기 조립체의 열설계를 제안하였으며, 설계의 유효성을 해석적으로 입증하였다.

• 소음진동
• /
• 제9권4호
• /
• pp.795-805
• /
• 1999

Rubber mounts so called grommets and pipes are two major paths of vibration transmission from a compressor, an important vibration source in an air conditioner, to the whole unit. A procedure of configuring the suction and discharge pipes of the compressor was developed in this paper so as to reduce the vibration transmission through the pipes as well as the grommets. Through investigating the effects of shapes and connecting disrections of pipe elements on vibration transmission, a guideline to configure the pipe layout, which enables to reduce vibration transmission, was proposed. The initial pipe layout by the guideline was optimized with the objective function, minimization of boty vibration transmission and the cost, and with the constraints to yield the final dimensions of the pipes. The procedure not only minimizes the transmitted force to the circumferential devices but enables to eliminate rubber blocks or dampers, which are generally used to avoid resonances of the pipe system.

• 한국음향학회지
• /
• 제6권1호
• /
• pp.48-57
• /
• 1987

냉장고에 있어서 소음의 주발생원이 압축기라는 것은 잘 알려져 있는 사실이며 최근 제품의 경량화와 고급화 추세에 따라 그 영향이 더욱 증대되고 있다. 본 연구에서는 이러한 소음을 방지 또는 감소시키기 위하여 냉장고용 압축기에 대한 음압과 음향인텐시티를 측정하여 소음의 방사특성을 파악하였으며 이를 규명하기 위하여 실험적 모우드 해석법을 압축기 구조물에 대하여 적용하였다. 연구결과, 압축기 내부의 모우터 구동에 의해 발생한 진동이 스프링에 의해 효과적으로 절연되지 못하고 있으며 압축기의 shell과 mounting도 소음에 크게 기여하고 있음을 알았다.

• 한국소음진동공학회논문집
• /
• 제15권3호
• /
• pp.280-289
• /
• 2005

A single degree of freedom system and transmissibility are key concepts in many problems of vibration isolation. In order to apply this approach, however, several assumptions must be satisfied, which are often not realistic. For examples, in practical systems, vibration transmissions at multi-point with multi-degree of freedom(translational and rotational DOF) take place and mobilities or impedances of receiver structures cannot be ignored any more especially over high frequency range. Therefore, a multi-dimensional treatment is required for accurate estimation of dynamic behavior of the system. In this paper, an approach using vibrational power flow is introduced to deal with analysis of multi-dimensional vibration isolation system in a more practical way and in aspects of vibration isolations and vibration path analysis. Procedures of this approach and some results of research for vibrational power path analysis with rotational terms included are presented. Difficulties in this method are also discussed.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2003년도 춘계학술대회논문집
• /
• pp.1128-1133
• /
• 2003

A gas driven heat pump (GHP) core design comprises internal combustion engine, compressors incorporated to a cooling/heating system, rubber mountings and belt transmissions. Main excitation farces are generated by an engine, compressors themselves and belt fluctuation. It leads to high vibration level of the mount that can cause damage of GHP elements. Therefore an appropriate design of the mounting system is crucial in terms of reliability and vibration reduction. In this paper oscillation of the engine mount is explored both experimentally and analytically. Experimental analysis of natural frequencies and operational frequency response of the GHP engine mounting system enables to create simplified model for numerical and analytical investigations. It is worked out criteria f3r vibration abatement of the isolated structure. Influence of bracket stiffness between engine and compressors, suspension locations and damper performance is investigated. Ways to reduce excitation forces and improve dynamic performance of the engine-compressor mounting system are considered from these analyses. Implementation of the proposed approach permits to choose appropriate rubber mountings and their location as well as joining elements design A phase matching technique can be employed to control forces from main exciters. It enables to changing vibration response of the structure by control of natural modes contribution. Proposed changes lead to significant vibration reduction and can be easily utilized in engineering practice.