Analysis of a gravity compensation system for deployment tests
Marchand, Anthony
Promotor(s) : Bruls, Olivier
Date of defense : 8-Sep-2016/9-Sep-2016 • Permalink : http://hdl.handle.net/2268.2/1619
Details
Title : | Analysis of a gravity compensation system for deployment tests |
Translated title : | [fr] Analyse d'un système de compensation de gravité pour des tests en déploiement |
Author : | Marchand, Anthony |
Date of defense : | 8-Sep-2016/9-Sep-2016 |
Advisor(s) : | Bruls, Olivier |
Committee's member(s) : | Rochus, Pierre
Kerschen, Gaëtan Dewalque, Florence |
Language : | English |
Number of pages : | 83 |
Discipline(s) : | Engineering, computing & technology > Aerospace & aeronautics engineering Engineering, computing & technology > Mechanical engineering |
Institution(s) : | Université de Liège, Liège, Belgique |
Degree: | Master en ingénieur civil en aérospatiale, à finalité approfondie |
Faculty: | Master thesis of the Faculté des Sciences appliquées |
Abstract
[en] This thesis aims to design a gravity compensation system for deployment tests of solar
panels performed in order to study the behavior of tape-spring hinges. The proposed
system consists of a set of two-link manipulators moving above the solar panels and whose
tips are attached to the solar panels through suspension points. A system of pulleys and
cable allows to link each solar panel to a counterweight and hence to compensate its
weight. The lengths of the manipulators links are deduced from a kinematic analysis
taking into account the avoidance of singularities. It is shown that for limiting the length
of the manipulators and so their inertia, the xation support of the manipulators should
coincide with the xation support of the solar panels. Then, di erent hollow rectangle
cross-sections made of Aluminum alloys are selected for the manipulators links taking
into account the limitation of the de
ection at the manipulator tip in addition to the
limitation of the inertia. A dynamical analysis assesses the validity of the implemented
gravity compensation system. Simulations are performed on the suspension of one solar
panel for deployment tests (high amplitude, low frequency) as well as for small vibration
tests (low amplitude, high frequency). For each type of tests, three ranges of frequencies
are de ned in which respectively the maximum relative error on the gravity compensation
remains under 10%, the compensation system still supports correctly the solar panels
despite of a lower gravity compensation and the system is not anymore able to ensure
any of these two functions. The impact of the gravity compensation system is also
discussed and it is shown that it is more important for small vibration tests where
higher frequencies are encountered. Finally, some technical aspects as the conception
of speci c hinges allowing the decoupling of the horizontal and vertical motions of the
cable are discussed.
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