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Ambrósio, Jorge; Gonçalves, João Nikolai Vargas

doi:10.1023/a:1017522623008

Cited by 85 publications

(7 citation statements)

References 11 publications

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“…The actuation law presented here is different from that reported by Anantharaman and Hiller [1991], which was used to model the SAR antenna with panels made of isotropic material. In fact, when the actuation law used by Antharaman and Hiller is used for the composite flexible models the satellite antenna is driven to a different equilibrium state than that obtained in the rigid model.…”

Section: Description Of the Sar Antenna The Folding Antenna Shown Inmentioning

confidence: 79%

“…The technical system modeled within this application consists in the unfolding process of a satellite antenna, the Synthetic Aperture Radar (SAR) antenna, which is a part of the European research satellite ERS-1. The model of this antenna has been the object of different studies in several studies in multibody dynamics being first proposed by Hiller [1983] and Anantharaman and Hiller [1991]. Figure 3 is achieved through a relatively complex spatial mechanism.…”

Section: Optimization Of a Satellite Unfolding Processmentioning

confidence: 87%

“…The problems associated with the unfolding of an isotropic flexible model due to the actuator deployment law have been identified by Anantharaman and Hiller [1991], and the solution found was to modify that actuation in order to prevent the wrong deployment mechanism, which is in essence similar to the solution adopted here. When using composite material models, the problem of the first phase of the unfolding process increases in importance not only because the bending of the panels is significant but also because torsional modes come in play.…”

Section: Description Of the Sar Antenna The Folding Antenna Shown Inmentioning

confidence: 99%

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Optimization of a satellite with composite materials

Ambrósio

Neto

Leal

2007

JOMMS

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The design of complex flexible multibody systems for industrial applications requires not only the use of powerful methodologies for the system analysis, but also the ability to analyze potential designs and to decide on the merits of each one of them. This paper presents a methodology using optimization procedures to find the optimal layouts of fiber composite structure components in multibody systems. The goal of the optimization process is to minimize structural deformation and to fulfill a set of multidisciplinary constraints. These methodologies rely on the efficient and accurate calculation of the system sensitivities to support the optimization algorithms. In this work a general formulation for the computation of the first order analytic sensitivities based on the direct differentiation method is used. The direct method for sensitivity calculation is obtained by direct differentiation of the equations defining the response of the structure with respect to the design variables. The equations of motion and the sensitivities of the flexible multibody system are solved simultaneously and, therefore, the accelerations and velocities of the system, and the sensitivities of the accelerations and velocities, are integrated in time using a multistep multiorder integration algorithm. Different models for the flexible components of the system, using beam and plate elements, are also considered. Finally, the methodology proposed here is applied to the optimization of the unfolding of a complex satellite made of composite plates and beams. The ply orientations of lamination are the continuous design variables. The potential difficulties in the optimization of composite flexible multibody systems are highlighted in the discussion of the results obtained.

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Section: Description Of the Sar Antenna The Folding Antenna Shown Inmentioning

confidence: 79%

Section: Optimization Of a Satellite Unfolding Processmentioning

confidence: 87%

Section: Description Of the Sar Antenna The Folding Antenna Shown Inmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of a satellite with composite materials

Ambrósio

Neto

Leal

2007

JOMMS

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“…The first three mode shapes were shown in Figure 6. Since large vibration transmitted to the vehicle body is generally below 50 Hz [4]. The selected modal frequencies were up to 70 Hz, as shown in Table 1.…”

Section: Vehicle Flexible Body Structurementioning

confidence: 99%

Steering test of mid-size bus with flexible-body dynamics model

Chen

Hwang

2018

MATEC Web Conf.

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The object of this paper is to analyze the vehicle structural vibration responses during the step steering simulation test. With computer simulations, confirming the influence from the difference between configurations of components on mid-size electrical bus and tradition one could be possible. The difference of the vibration responses between flexible multi-body model and rigid one would be discussed. Since the wheel base of mid-size bus is longer than passenger car, the deformation of vehicle body more obviously influences the output of vibration response. The operating condition in practical driving can be expressed by flexible model, and the performance prediction of vehicle can be closer to the real vehicle behavior. The difference between the flexible body simulation and rigid body simulation is 1.17%, and the flexible body model is more practical.

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“…Among these approaches, the Lagrange equation has been widely applied to build forward or inverse kinematics model [11] and [12]. A flexible body can be considered as a collection of nodes in a finite element model, and deformation can be seen as a linear superposition of mode shapes.…”

Section: The Equations Of Motion For a Flexible Multi-body Systemmentioning

confidence: 99%