Sergio Pellegrino
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View article: Manufacturing of ultra-thin thermoplastic TRAC longerons
Manufacturing of ultra-thin thermoplastic TRAC longerons Open
View article: Space solar power generation: A viable system proposal and technoeconomic analysis
Space solar power generation: A viable system proposal and technoeconomic analysis Open
View article: Space solar power generation: a viable system proposaland technoeconomic analysis
Space solar power generation: a viable system proposaland technoeconomic analysis Open
This paper presents a distributed space solar power generation and transmission system that converts solar insolation into microwave power and beams it to Earth. This system, composed of a power station of large, close-flying modules resid…
View article: Experimental characterization and stochastic models for time-dependent rupture of thin-ply composite laminates
Experimental characterization and stochastic models for time-dependent rupture of thin-ply composite laminates Open
View article: Stability of Torsionally-Soft Deployable Structures Supporting Prestressed Membranes
Stability of Torsionally-Soft Deployable Structures Supporting Prestressed Membranes Open
View article: Space Solar Power Generation: A Viable System Proposal and Technoeconomic Analysis
Space Solar Power Generation: A Viable System Proposal and Technoeconomic Analysis Open
View article: Slew Maneuver Constraints for Agile Flexible Spacecraft
Slew Maneuver Constraints for Agile Flexible Spacecraft Open
Traditional spacecraft design paradigms rely on stiff bus structures with comparatively flexible appendages. More recent trends, however, trade deployed stiffness for packaging efficiency to stow apertures with larger areas inside existing…
View article: Popup Arrays for Large Space-Borne Apertures
Popup Arrays for Large Space-Borne Apertures Open
Large apertures in space are critical for high-power and high-bandwidth applications spanning wireless power transfer (WPT) and communication, however progress on this front is stunted by the geometric limitations of rocket flight. Here, w…
View article: Mass efficiency of strip-based coilable space structures
Mass efficiency of strip-based coilable space structures Open
View article: Probing the stability of thin-shell space structures under bending
Probing the stability of thin-shell space structures under bending Open
View article: A Lightweight Space-based Solar Power Generation and Transmission Satellite
A Lightweight Space-based Solar Power Generation and Transmission Satellite Open
We propose a novel design for a lightweight, high-performance space-based solar power array combined with power beaming capability for operation in geosynchronous orbit and transmission of power to Earth. We use a modular configuration of …
View article: Deployment Dynamics of Thin-Shell Space Structures
Deployment Dynamics of Thin-Shell Space Structures Open
Thin-shell structures provide a lightweight solution for deployable structure applications. Despite being only few tens of microns thick, these structures provide excellent bending stiffness, thanks to their curved cross-section. Their thi…
View article: supplemental materials.zip from Kirigami tiled surfaces with multiple configurations
supplemental materials.zip from Kirigami tiled surfaces with multiple configurations Open
This paper presents new kirigami patterns consisting of tiles connected by sub-folds that can approximate multiple specified target surfaces. The curvature of the surfaces approximated by the tiles varies as the patterns are …
View article: Correction: Experimental Study of Time-dependent Failure of High Strain Composites
Correction: Experimental Study of Time-dependent Failure of High Strain Composites Open
View article: A Theory for the Design of Multi-Stable Morphing Structures
A Theory for the Design of Multi-Stable Morphing Structures Open
View article: Attitude maneuver design for planar space solar power satellites
Attitude maneuver design for planar space solar power satellites Open
This paper investigates the attitude dynamics of a planar space solar power satellite (SSPS) by formulating the power-optimal guidance problem as a nonlinear trajectory optimization problem. The power-optimal guidance problem determines th…
View article: Lightweight Carbon Fiber Mirrors for Solar Concentrator Applications
Lightweight Carbon Fiber Mirrors for Solar Concentrator Applications Open
Lightweight parabolic mirrors for solar concentrators have been fabricated using carbon fiber reinforced polymer (CFRP) and a nanometer scale optical surface smoothing technique. The smoothing technique improved the surface roughness of th…
View article: Phenomenological model for coupled multi-axial piezoelectricity
Phenomenological model for coupled multi-axial piezoelectricity Open
A quantitative calibration of an existing phenomenological model for polycrystalline ferroelectric ceramics is presented. The model relies on remnant strain and polarization as independent variables. Innovative experimental and numerical m…
View article: Fast and broadband detector for laser radiation
Fast and broadband detector for laser radiation Open
We developed a fast detector (patent pending) based on the Laser Induced Transverse Voltage (LITV) effect. The advantage of detectors using the LITV effect over pyroelectric sensors and photodiodes for laser radiation measurements is the c…
View article: Design of ultra-thin composite deployable shell structures through machine learning
Design of ultra-thin composite deployable shell structures through machine learning Open
A data-driven computational framework is applied for the design of optimal ultra-thin Triangular Rollable and Collapsible (TRAC) carbon fiber booms. High-fidelity computational analyses of a large number of geometries are used to build a d…
View article: Trajectory Design of a Spacecraft Formation for Space-Based Solar Power Using Sequential Convex Programming
Trajectory Design of a Spacecraft Formation for Space-Based Solar Power Using Sequential Convex Programming Open
The concept of collecting solar power in space and transmitting it to the Earth using microwaves has been studied by numerous researchers in the past. The Space Solar Power Initiative (SSPI) at Caltech is a collaborative project to bring a…
View article: Multilayer active shell mirrors for space telescopes
Multilayer active shell mirrors for space telescopes Open
A novel active mirror technology based on carbon fiber reinforced polymer (CFRP) substrates and replication techniques has been developed. Multiple additional layers are implemented into the design serving various functions. Nanolaminate m…
View article: Architecture for in-space robotic assembly of a modular space telescope
Architecture for in-space robotic assembly of a modular space telescope Open
An architecture and conceptual design for a robotically assembled, modular space telescope (RAMST) that enables extremely large space telescopes to be conceived is presented. The distinguishing features of the RAMST architecture compared w…
View article: Fundamental investigation on the mechanical behavior of weld seams
Fundamental investigation on the mechanical behavior of weld seams Open
The solid state welding processes allow joints free from defects with reduced residual stresses and low distortion. However, such processes are generally characterized by a complex mechanical junction because of the particular material flo…
View article: Comparative analysis of bonding mechanism in solid state metal working processes
Comparative analysis of bonding mechanism in solid state metal working processes Open
\nThe Piwnik and Plata pressure-time bonding criterion was applied to Friction Stir Welding, Linear Friction Welding, Porthole Extrusion and Roll Bonding. A neural network was set up, trained and used to predict the bonding occurrence star…
View article: Optimized actuators for ultrathin deformable primary mirrors
Optimized actuators for ultrathin deformable primary mirrors Open
A novel design and selection scheme for surface-parallel actuators for ultrathin, lightweight mirrors is presented. The actuation system consists of electrodes printed on a continuous layer of piezoelectric material bonded to an optical-qu…
View article: Adaptive Multi-Functional Space Systems for Micro-Climate Control
Adaptive Multi-Functional Space Systems for Micro-Climate Control Open
This report summarizes the work done during the Adaptive Multifunctional Systems for Microclimate Control Study held at the Caltech Keck Institute for Space Studies (KISS) in 2014-2015. Dr. Marco Quadrelli (JPL), Dr. James Lyke (AFRL), and…
View article: Random Surface Texturing of mc-Silicon for Solar Cells with Picosecond Lasers; a Comparison between 1064 nm, 532 nm and 355 nm Laser Emission Wavelengths
Random Surface Texturing of mc-Silicon for Solar Cells with Picosecond Lasers; a Comparison between 1064 nm, 532 nm and 355 nm Laser Emission Wavelengths Open
Multicrystalline Silicon was textured with picosecond laser. Different laser wavelengths (λ = 1064, 532, 355 nm) where compared regarding laser-induced damage. We found that λ = 355 nm picosecond radiation resulted in shallower defect-reac…