2026-04-13T01:41:49Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/3725122025-07-17T16:51:03Zcom_2072_1033col_2072_452951

00925njm 22002777a 4500 dc Carmona Peña, Alex author 2022-07-13 The Wide Field Monitor (WFM) is a coded mask instrument that is one of the four instruments that compose the scientific payload of the enhanced X-ray Timing and Polarimetry mission (eXTP), designed to study the state of matter under conditions of extreme density, gravity and magnetism. This work assesses its design through mechanical simulations, focusing on the behaviour of the coded mask, its frames and the collimator. A big emphasis is placed on the study of the pretension of the mask, provided by the pretension mechanism, which consists of the frames and a series of uniformly distributed bolts and is required to give the mask enough rigidity to fulfil its scientific requirements. The mechanical simulations have consisted of two step analyses, which have a first static step that applies the pretension to the system and a second step that performs a modal analysis. The WFM has been assessed progressively, first studying the mask, then including the frames, and the final simulations have included the collimator. The optimisation of the pretension has been one of the focuses, and a code that employs a Genetic Algorithm (GA) has been developed for that purpose. The analyses have shown that pretension is an effective way of increasing the rigidity of the mask by showing a very significant increase in natural frequency when pretension was applied. Moreover, the current design of the pretension mechanism has been shown to be capable of applying the pretension effectively and solving the issues of a previous design. The, currently in-progress, execution of the GA shows a good evolution toward an optimal set of solutions, as the proposed solutions by the GA take shapes following what the analyses throughout this work indicated would improve the results. Finally, the analyses with the collimator, which tested various design differences, have shown which part should be reinforced in the final design. Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica Artificial satellites X-Rays Computer simulation Materials -- Mechanical properties Materials -- Effect of space environment on Large space structures (Astronautics) eXTP WFM ICE CSIC IEEC Space Astrophysics FEM Modes X-ray GA Satèl·lits artificials Raigs X Simulació per ordinador Materials -- Propietats mecàniques Materials -- Efecte del medi ambient espacial Grans estructures espacials (Astronàutica) Mechanical simulations of the Wide Field Monitor instrument for the eXTP X-ray satellite