Experiences in Teaching Multibody Dynamics

Cavacece, Massimo; Pennestrı̀, Ettore; Sinatra, Rosario

doi:10.1007/s11044-005-0723-z

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…At this point, several simulations of the deployment phase have been carried out to find the spring stiffness and damping coefficient of the dampers, imposing an opening time of the mechanism of about 30 s as a constraint. The integration method and the values of the parameters used for the simulation have been adapted for the specific case of contacts as suggested in References [23][24][25][26]. The selection of the stiffnesses of the torsion springs was influenced by the maximum torsion angle, which must be greater than 177 • , and by the diameter of the pin (8 mm) on which the spring is to be positioned.…”

Section: Spring-damper Systemmentioning

confidence: 99%

Design of a Large Deployable Reflector Opening System

et al. 2020

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Large Deployable Reflectors (LDR) are receiving considerable attention from aerospace government companies and researchers. In this paper, the design of the opening system of a LDR is presented. Starting from an elementary cell, a first ideal kinematic model is discussed. Then, a more complex "design model" including feasible design solutions for joints and links is developed. The final design avoids collisions between links while maintaining the original kinematic features.

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Section: Spring-damper Systemmentioning

confidence: 99%

Design of a Large Deployable Reflector Opening System

et al. 2020

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“…Several experimental methodologies [17][18][19][20] based on a multi-body approach have been developed [21][22][23][24][25][26][27][28][29]. Recently, methods based on fuzzy logic [30][31][32][33][34], neural networks [35], and genetic algorithms have been applied for the tensioning of space trusses [36,37].…”

Section: Experimental Settings For Calibrationmentioning

confidence: 99%

Tie-System Calibration for the Experimental Setup of Large Deployable Reflectors

et al. 2019

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The trade-off between the design phase and the experimental setup is crucial in satisfying the accuracy requirements of large deployable reflectors. Manufacturing errors and tolerances change the root mean square (RMS) of the reflecting surface and require careful calibration of the tie-rod system to be able to fit into the initial design specifications. To give a possible solution to this problem, two calibration methods—for rigid and flexible ring truss supports, respectively—are described in this study. Starting from the acquired experimental data on the net nodal co-ordinates, the initial problem of satisfying the static equilibrium with the measured configuration is described. Then, two constrained optimization problems (for rigid or flexible ring truss supports) are defined to meet the desired RMS accuracy of the reflecting surface by modifying the tie lengths. Finally, a case study to demonstrate the validity of the proposed methods is presented.

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“…Several experimental methodologies [17][18][19][20] based on multibody approach have been developed [21][22][23][24][25][26][27][28][29]. Recently, methods based on the Fuzzy logic [30][31][32][33][34], neural networks [35] and genetic algorithm have been applied for the tensioning of space trusses [36,37].…”

Section: Experimental Setting For Calibrationmentioning

confidence: 99%

Tie-System Calibration for the Experimental Setup of Large Deployable Reflectors

Cammarata¹,

Sinatra²,

Rigato³

et al. 2019

Preprint

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The tradeoff between the design phase and the experimental setup is crucial to satisfy the accuracy requirement of Large Deployable Reflectors. Manufacturing errors and tolerances change the RMS of the reflecting surface and require careful calibration of the tie rod system to be able to fit into the initial design specifications. To give a possible solution to this problem, here two calibration methods, respectively for rigid and flexible ring truss support, are described. Starting from the acquired experimental data on the net nodal coordinates, the initial problem of satisfying the static equilibrium at the measured configuration is described. Then, two constrained optimization problems, for rigid and flexible ring truss support, are defined to meet RMS accuracy of the reflecting surface modifying the tie lengths. Finally, a case study to demonstrate the validity of the proposed methods is presented.

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Experiences in Teaching Multibody Dynamics

Cited by 13 publications

References 11 publications

Design of a Large Deployable Reflector Opening System

Design of a Large Deployable Reflector Opening System

Tie-System Calibration for the Experimental Setup of Large Deployable Reflectors

Tie-System Calibration for the Experimental Setup of Large Deployable Reflectors

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