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Technical Paper

Verification of ENVISAT ASAR Active Antenna Thermal Design by a Thorough Sensitivity Analysis

1997-07-01
972531
The ENVISAT ASAR antenna is 10 meters in length in the deployed configuration and consequently thermal balance testing was impossible due to TVAC chamber size and MGSE limitations. Therefore the verification of the ASAR active antenna thermal design was based mainly on analysis complemented, when necessary, by thermal balance tests at subsystem level on key components. This approach called up for extensive sensitivity analyses, taking into account the fact that all of the design, orbital parameters, operational scenario and mathematical simulation are subject to uncertainties. Special emphasis was put on assessing the impact of uncertainties on albedo and earthshine for low time constant components of the ASAR antenna which is facing the Earth.
Technical Paper

MANIP A Modelling and Simulation Tool for Thermal Engineers

1989-07-01
891557
MANIP development aims at providing an interactive, integrated software environment for performing the thermal design of spacecrafts. The user of MANIP is expected to be a thermal engineer, not a programmer. This basic requirement determines the essence of MANIP and has a major impact on the requirements related to defining, refining and simulating a model, and subsequently analysing the simulation results. The paper highlights the main aspects of implementation and use.
Technical Paper

First Use of ECOSIM in Air Management Systems

1992-07-01
921292
ECOSIM is a software tool for the simulation of Environmental Control and Life Support (ECLS) systems which has been developed for the European Space Agency. A preliminary model of the Hermes Air Management System has been developed during the ECOSIM testing in order to assess the functionality of the software and to verify its results with those obtained from previous simulation tools. The model represents the Hermes cabin with its crew and it includes submodels for the sub-systems performing the following functions: Temperature and Humidity Control. Total Pressure and Composition Control. Air revitalisation. The interactions between these different subsystem are taken into account by the model, while many of the previous simulations made assumptions to decouple the different subsystems (e.g: a constant cabin temperature has been assumed during cabin depressurization transients, to decouple the pressure control section from the air conditioning section).
Technical Paper

ESATAN FHTS Fluid Network Analysis

1989-07-01
891559
Fluid loop modelling has been added to the capabilities of the thermal analyser ESATAN. Predictions of pressure and mass flow rate, in addition to the thermal solution, may now be obtained in one dimensional piped fluid networks. Such predictions may be steady state or transient, with single or homogeneous two phase flow. The user interface has been designed for compatibility with conventional ESATAN model input, by definition of fluid nodes and links. Predefined models of common fluid loop hardware are provided as part of the software package. Analysis may be all-fluid, all-thermal, or both fluid and thermal simultaneously.
Technical Paper

ECOSIM - An Environmental Control Simulation Software

1991-07-01
911543
This paper discusses the capabilities of the ECOSIM software which is currently under development for the European Space Agency. This software is primarily intended to simulate Environmental Control and Life Support (ECLS) systems. It may be also customised to the simulation of passive and active thermal control systems, power systems, and more generally any system which can be described as a set of interconnected physical components. ECOSIM shall provide a powerful continuous simulation language, a graphical user interface and a library of ECLSS custom-made components. After a brief overview of the major aims of the development, the software is discussed from its main aspects, the language and its mathematical formalism, the graphical user interface, and the ECLS systems customisation for representing the physical, chemical, and biological processes of interest. Examples are provided aiming at enhancing the understanding of the critical aspects of the language and the user interface.
Technical Paper

ABLAT, Ablation Modeling Extension to ESATAN

1992-07-01
921294
This paper discusses the capabilities of the ABLAT software which has been developed by ERC and Dornier for the European Space Agency. The software provides an ablation modelling capability for the ESATAN thermal analyser and consists of two sections: i. A stand-alone preprocessor allowing specification of the ablation model. This has both an X11/OSF Motif and a command line interface. ii. An integrated solver capability within the ESATAN system, allowing transient analysis of an ablating surface in conjunction with a standard thermal model. After a brief overview of the major aims of the development, the software is discussed from two main points of view, the user interface facilities (how the user defines the model to the system), and the calculation facilities (what can be calculated, and how are these calculations performed).
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