Investigation of Gas Effects on Cryocooler Resonance Characteristics
Investigation of Gas Effects on Cryocooler Resonance Characteristics
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DOI：
10.1007/978-1-4615-5869-9_49
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
M. Heun;S. Collins;D. Johnson;R. Ross
中科院分区：
文献类型：
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作者：
M. Heun;S. Collins;D. Johnson;R. Ross
低温冷却器的热性能和振动性能从根本上来说是由机械系统和工作流体之间的动态相互作用决定的。本文探讨了工作流体特性对冷却器机械响应的影响。从喷气推进实验室的低温冷却器测试和表征的广泛计划下表征的两个冷却器收集的实验数据表明，经典的单自由度弹簧质量阻尼器模型无法捕获机械响应的完整频率依赖性。来自两种冷却器运行模式（晃动和头对头）的数据用于解释工作流体特性在高频下占主导地位，而机械系统特性在低频下占主导地位。工作温度被证明是决定共振行为的重要因素。最后，讨论提供了一个框架，在该框架内可以从实验数据中提取谐振参数和冷却器特性。
Cryocooler thermal and vibrational performance is determined, fundamentally, by the dynamic interactions between the mechanical system and the working fluid. This paper explores the effect of working-fluid characteristics on the mechanical response of the cooler. Experimental data collected from two coolers characterized under the Jet Propulsion Laboratory’s extensive program of cryocooler testing and characterization show that a classical single-degree-of- freedom spring-mass-damper model does not capture the full frequency dependence of the mechanical response. The data from two modes of cooler operation (slosh and head-to-head) are used to motivate the explanation that working-fluid characteristics dominate at high frequencies, and mechanical system characteristics dominate at lower frequencies. Operating temperature is shown to be a significant factor in determining resonance behavior. Finally, the discussion provides a framework within which resonant parameters and cooler characteristics can extracted from the experimental data.