Tenders are invited for Simulation Software for Modelling Structure/Aocs Coupling - Expro plus The objective of this activity is to develop a software toolbox to link structural modelling software with AOCS control software. Description: Large space structures are expected to exhibit structural modes at low frequency likely to couple with the AOCS control system. The objective of this activity is to couple the structure mathematical model (FEM) with the AOCS control software to perform design, verification and validation activities. While a direct coupling of the FEM with the Functional Engineering Simulator (FES) that models the control system behaviour can serve for simulation purposes and play an important role in the validation process, an additional step is needed to develop linearised models that can be employed in the AOCS design and verification activities. Such models need to capture the nominal dynamic behaviour as well as uncertainties in the dynamics formulation and in the dynamical parameters. These need to be captured and quantified according to the specific modelling techniques used in control system design (typically Linear Fractional Transformations (LFT)). This would allow to model the interaction between a large flexible structure with the attitude control system (including investigating the effectiveness of distributed attitude control hardware sensors/actuators). Tis activity will develop suitable structural models for highly flexible structures to be accounted for in control design and verification activities.The activity will encompass the following tasks: Review and select on-board uncertainty modelling techniques based on the LFT framework. Assess the dynamic and kinematic modelling requirements for a very large space structure. Implement detailed nominal as well as uncertain models of the main effects relevant to the modellisation of very large space structures. Degraded configurations considering potential structural failures as well as failures in AOCS sensors or actuators shall be considered. Validate such models against analytical (where possible) as well as experimental data.Read more Tender Link : https://esastar-publication-ext.sso.esa.int/ESATenderActions/filter/open
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