加热器对LTP动力学的诱导热效应
Heater induced thermal effects on the LTP dynamics
摘要：
LPF（LISA路径）任务的STOC（科学和技术操作中心）模拟器旨在为任务操作远程指挥链提供验证工具，以及更深入地了解LTP（LISA技术包）中发生的底层物理过程。在将出现的不同物理效应中，电极外壳（EH）中的温度波动可能会对干涉仪（IFO）读数产生干扰，因此必须了解并控制它们。在这篇文章中，我们报告的最新进展，分析在IEEC的LTP响应的热信号注入加热器。更具体地说，我们确定了在LTP频带（从1 mHz到30 mHz）中将热输入信号与测试质量（TM）上的力相关联的传递函数。由欧洲航天技术中心（ESTEC）制定和维护的整个LPF航天器和有效载荷的完整热模型用于获得对规定点（加热器）的热输入作出响应的温度分布，随后对该温度分布进行处理，以计算对试验质量的相关动力学影响。
英文摘要：
The STOC (Science and Technology Operations Centre) simulator of the LPF (LISA PathFinder) mission is intended to provide a validation tool for the mission operations tele-commanding chain, as well as for a deeper understanding of the underlying physical processes happening in the LTP (LISA Technology Package). Amongst the different physical effects that will appear onboard, temperature fluctuations in the Electrode Housing (EH) could generate disturbances on the interferometer (IFO) readouts, therefore they must be known and controlled. In this article we report on the latest progress in the analysis at IEEC of the LTP response to thermal signals injected by means of heaters. More specifically, we determine the transfer functions relating heat input signals to forces on the Test Masses (TMs) in the LTP frequency band, from 1 mHz to 30 mHz. A complete thermal model of the entire LPF spacecraft plus payload, elaborated and maintained at European Space Technology Center (ESTEC), was used to obtain temperature distributions in response to heat inputs at prescribed spots (heaters), which are later processed to calculate the associated dynamical effects on the Test Masses.
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