Sosso Andrea, Durandetto Paolo
INRiM - Istituto Nazionale di Ricerca Metrologica, Torino, Italy.
MethodsX. 2018 Jun 26;5:841-847. doi: 10.1016/j.mex.2018.06.013. eCollection 2018.
This report deals with the analysis of a cryocooler as a linear dynamical system around a set point, over a range of temperatures where the thermal properties can be considered constant. The accurate knowledge of the cryocooler temperature dependence with a time dependent power stimulus allows to analyze the thermodynamical properties of the system and understand the power flow related, for example, to the cryocooler temperature fluctuations. This is useful for the design of efficient thermal dampers that are necessary for the thermal stabilization of the device under test Sosso et al. [1], Trinchera et al. [2]. Two different and independent methods for deriving the cooler dynamic (i.e. non-stationary) behavior are described using the two main approaches to mathematically represent a dynamical system: step response and transfer function. •Using both approaches we were able to cross check results and provide an estimate of the accuracy of each method.•The instrumentation required is typically available in physics and engineering laboratories.•These results provide insights on cryocooler thermodynamics and design tools for cryocooler engineering.
本报告探讨了将低温制冷机作为围绕设定点的线性动态系统进行分析，该分析是在一系列温度范围内进行的，在此温度范围内热特性可视为恒定。准确了解低温制冷机温度随时间变化的功率激励的依赖性，有助于分析系统的热力学特性，并理解例如与低温制冷机温度波动相关的功率流。这对于设计高效的热阻尼器很有用，而热阻尼器是被测设备热稳定所必需的（索索等人[1]，特里内拉等人[2]）。本文使用两种在数学上表示动态系统的主要方法：阶跃响应和传递函数，描述了两种不同且独立的推导制冷机动态（即非平稳）行为的方法。•使用这两种方法，我们能够交叉核对结果，并对每种方法的准确性进行估计。•所需的仪器设备在物理和工程实验室中通常都有。•这些结果为低温制冷机热力学提供了见解，并为低温制冷机工程提供了设计工具。
