Thermal Stability Analysis in the Frequency Domain using the ESATAN Thermal Suite

2008-01-2078

06/29/2008

Event
International Conference On Environmental Systems
Authors Abstract
Content
An increasing number of spacecraft missions have very stringent requirements for thermal stability to avoid thermally driven noise from affecting the main observables. For example, it may be necessary to reduce temperature fluctuations in the neighbourhood of the instrument below micro-Kelvin (μK). Consequently, the influence of fluctuations in boundary temperature or internal power dissipation on temperature at the instrument detector must be precisely evaluated.
Thermal stability requirements are usually expressed as an upper limit on the linear spectrum density (LSD) of temperature fluctuations. This indicates the strength of the response to a perturbation of a given frequency, and is usually stated in units of K/√Hz. The LSD can be estimated by running a succession of transient simulations and applying Fast Fourier Transforms techniques, but this method is time-consuming and has numerical limitations. An alternative approach is to linearise the system and go directly to the frequency domain, in order to compute the transfer function from which the LSD can be obtained.
The latter analytical capability is now fully integrated into the ESATAN Thermal Suite. A new solution module computes the frequency-response transfer function from which the LSD can be calculated. This innovative integration into a thermal network software allows you to perform the core of the thermal stability analysis entirely within a single environment.
Meta TagsDetails
DOI
https://doi.org/10.4271/2008-01-2078
Pages
10
Citation
Brouquet, H., Strutt, J., Fertin, D., and Molon, M., "Thermal Stability Analysis in the Frequency Domain using the ESATAN Thermal Suite," SAE Technical Paper 2008-01-2078, 2008, https://doi.org/10.4271/2008-01-2078.
Additional Details
Publisher
Published
Jun 29, 2008
Product Code
2008-01-2078
Content Type
Technical Paper
Language
English