Continuum Modeling of an Innovative Space-Based Radar Antenna Truss

Salehian, Armaghan; Cliff, Eugene M.; Inman, Daniel J.

doi:10.1061/(asce)0893-1321(2006)19:4(227)

Cited by 24 publications

(28 citation statements)

References 9 publications

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“…The need for such high compaction ratios spurred interest in innovative, unconventional, space truss technologies such as rigidizable-inflatable (RI) structures [21][22][23][24][25][26][27][28]. Additional discussion regarding design requirements and analysis of large deployable space antenna structures can be found in [29][30][31].…”

Section: A Deployable Radio Detection and Ranging Antennamentioning

confidence: 99%

Overview of the Innovative Space-Based Radar Antenna Technology Program

Lane

Murphey

Zatman

2011

Journal of Spacecraft and Rockets

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accomplished technology development and demonstration toward a 300 m deployable space antenna under the Innovative SpaceBased Radar Antenna Technology program. Risk-reduction activities focused on deployment testing, calibration, structural metrology, and real-time compensation. A 12 m phased-array-fed reflector engineering test unit was tested in a laboratory environment and demonstrated shaping of a single-curved, parabolic-cylinder mesh surface and deployment repeatability. A 12 m engineering test unit using rigidizable-inflatable structural components was also tested, but this approach was more problematic and less robust. Finally, two antenna metrology and compensation engineering test units were tested in a compact range. The results from one were reported. Data showed that the closed-loop system minimized phase error to less than 1=30 of a wavelength, given realistic disturbance inputs.

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Section: A Deployable Radio Detection and Ranging Antennamentioning

confidence: 99%

Overview of the Innovative Space-Based Radar Antenna Technology Program

Lane

Murphey

Zatman

2011

Journal of Spacecraft and Rockets

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“…For example, 1 st order hierarchical trusses are common for deployable booms, while a modular mesh deployable antenna [8] is a 2 nd order hierarchical truss.…”

Section: Definition and Examplesmentioning

confidence: 99%

Development of a new analytical tool to design hierarchical truss beams for natural frequency

et al. 2011

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A set of recursive equations are introduced for optimum design of a wide range of hierarchical truss beams to satisfy a minimum required natural frequency. The design equations are based on a general analytical solution, which are derived based on a critical dimensional analysis. A practical example is examined in both 2D and 3D spaces, which promises substantial mass reduction, as much as 99%, when using high order hierarchical truss beams. The results are verified by numerical evaluation of three case studies. The approach looks also very promising to design nanostructures when it comes to the problems associated with vibration.

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“…In this article we apply this dynamic modeling approach to the aforementioned inflatable satellite truss structure motivated by the Innovative Space-based radar Antenna Technology (ISAT), a DARPA program to place a large antenna in the Medium Earth Orbit (MEO). We derive the homogenized equations of motion for a satellite truss structure with a distributed array of macro-fiber composite (MFC) actuators, thereby extending the authors' previous work [7,8]. The resulting model is used to analyze the vibration response of the composite satellite structure and to quantify the dynamic effects of the MFC actuators.…”

Section: Introductionmentioning

confidence: 96%

“…This simplified modeling technique is particularly attractive for control applications. As discussed in Noor et al [5,6] and Salehian et al [7][8][9], there are a few ways of going about this discrete to continuum transformation process [10][11][12][13][14][15][16][17]. The method of interest here, developed by Noor et al [5], involves equating kinetic and potential energy expressions of the lattice and its intended beam equivalent.…”

Section: Introductionmentioning

confidence: 99%

“…The method of interest here, developed by Noor et al [5], involves equating kinetic and potential energy expressions of the lattice and its intended beam equivalent. From these expressions and by making necessary assumptions for local free deformations, the equivalent beam-like equations of motion can be derived [7,8]. In addition to the computational savings involved with the continuum modeling approach, also the mathematical structure of the equations of motion is preserved in that is possible to directly relate changes in structural design (i.e., geometry, material properties, etc.)…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Effects of Embedded Macro-Fiber Composite Actuators on Ultra-Light Flexible Structures of Repeated Pattern- a Homogenization Approach

Salehiana

2012

Shock and Vibration

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Motivated by deployable satellite technology, this article presents a homogenization model of an inflatable, rigidized lattice structure with distributed macro-fiber composite (MFC) actuation. The model is based upon a general expression for the strain and kinetic energy of a fundamental repeated element of the structure. These expressions are reduced in order and expressed in terms of the strain and displacement components of an equivalent one-dimensional vibration model. The resulting model is used to analyze changes in the structural natural frequencies introduced by the local effects of the added macro-fiber composite actuators for several configurations. A finite element solution is used as a comparison for the homogenization model, and the two are shown to be in good agreement, although the latter requires significantly less computational effort.

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Continuum Modeling of an Innovative Space-Based Radar Antenna Truss

Cited by 24 publications

References 9 publications

Overview of the Innovative Space-Based Radar Antenna Technology Program

Overview of the Innovative Space-Based Radar Antenna Technology Program

Development of a new analytical tool to design hierarchical truss beams for natural frequency

Dynamic Effects of Embedded Macro-Fiber Composite Actuators on Ultra-Light Flexible Structures of Repeated Pattern- a Homogenization Approach

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