Prof. Francesco Braghin Profile

Prof. Francesco Braghin

at Politecnico di Milano

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Author

Publications (16)

Proceedings Article | 20 April 2022 Presentation + Paper

Temporal waveguiding in modulated 2D lattices

J. Santini, E. Riva, F. Braghin

Proceedings Volume 12043, 1204307 (2022) https://doi.org/10.1117/12.2612352

KEYWORDS: Modulation, Wave propagation, Scattering, Waveguides

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Proceedings Article | 20 April 2022 Presentation + Paper

Tailoring edge-to-edge pumping via adiabatic transformations and non-Hermitian shortcuts

E. Riva, G. Castaldini, F. Braghin

Proceedings Volume 12043, 1204308 (2022) https://doi.org/10.1117/12.2605347

KEYWORDS: Modulation, Scattering, Wave propagation, Energy transfer

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Proceedings Article | 22 April 2020 Presentation + Paper

Design and experimental analysis of nonreciprocal wave propagation in a space-time modulated beam

Emanuele Riva, Davide Quadrelli, Jacopo Marconi, Gabriele Cazzulani, Francesco Braghin

Proceedings Volume 11376, 1137613 (2020) https://doi.org/10.1117/12.2558429

KEYWORDS: Modulation, Wave propagation, Switching, Diodes, Acoustics

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Proceedings Article | 15 March 2018 Presentation + Paper

Synchronized switch technique based on dynamical state of bi-stable energy harvesters

L. Alari, J. Udani, A. Arrieta, F. Braghin

Proceedings Volume 10595, 105950T (2018) https://doi.org/10.1117/12.2296710

KEYWORDS: Oscillators, Energy harvesting, Sensors, Mathematical modeling, Switching, Bistability

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Vibration energy harvesters have been proposed as an autonomous power source for meeting the limited power requirements of present-day sensors and electronics that find extensive usage in structural health monitoring systems. Recent research reveals that nonlinear energy harvesters outperform their linear counterparts, designed to operate on the principle of resonance, owing to their wide frequency bandwidth which allows for better performance in realistic operational environments. Particularly, bi-stable energy harvesters designed to exploit piezoelectricity to achieve the mechanical to electrical energy conversion have been widely investigated in literature. Additionally, several investigations have been also proposed to enhance power conversion in linear harvesters by introducing nonlinear circuits, e.g. based on synchronized switching (SS). In this respect, unveiling the effects on the bandwidth and coexisting solutions in the response of strongly nonlinear electrical SS shunts interacting with multi-stable structures requires further investigation. In particular, synchronized switch harvesting on inductor (SSHI) circuits, when connected in parallel with bi-stable energy harvesters, facilitate an increase in the harvested voltage, thus allowing for higher power generation as compared to a standard shunt load. This paper investigates the effects of utilizing a SSHI circuit for enhancing the power output in the different dynamical regimes of a bi-stable energy harvester. In particular, we present a comprehensive study of the efficiency of the SSHI circuit when the response configuration of the system is shifted between coexisting dynamical states of the bi-stable harvester. The herein presented semi-analytical and numerical results show that the qualitative performance of the SSHI circuit is quite robust in terms of superiority over the standard load circuit. However, the quantitative nature of the increase in power harvested by the SSHI circuit is sensitive to the optimal load in the circuit, which in turn varies with the dynamical state of the system.

Proceedings Article | 15 March 2018 Presentation + Paper

Observations on the behavior of discretely modulated spatiotemporal periodic structures

Jacopo Marconi, Gabriele Cazzulani, Emanuele Riva, Francesco Braghin

Proceedings Volume 10595, 105952N (2018) https://doi.org/10.1117/12.2297559

KEYWORDS: Metamaterials, Modulation, Smart materials, Numerical simulations, Mechanics, Smart structures, Wave propagation

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Proceedings Article | 11 April 2017 Paper

Semi active tunable mass damper for helicopters

Simone Cinquemani, Francesco Braghin, Ferruccio Resta

Proceedings Volume 10164, 1016431 (2017) https://doi.org/10.1117/12.2259987

KEYWORDS: Control systems, Chemical elements, 3D modeling, Actuators, Magnetism, Bismuth, Instrument modeling, Vibration control, Smart structures, Aerospace engineering, Head

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Proceedings Article | 11 April 2017 Paper

Enhanced synchronized switch damping control to cancel out the beating phenomenon

Gabriele Cazzulani, Marco Costantini, Francesco Braghin

Proceedings Volume 10164, 1016420 (2017) https://doi.org/10.1117/12.2259942

KEYWORDS: Actuators, Switches, Resistance, Switching, Vibration isolation, Systems modeling, Optimization (mathematics), Signal processing, Process control, Control systems, Circuit switching, Logic, Capacitance, Electrodes, Mechanical engineering

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Proceedings Article | 11 April 2017 Paper

Dynamics of periodic spring-mass chain coupled with an electric transmission line

Edoardo Belloni, Mattia Cenedese, Francesco Braghin

Proceedings Volume 10164, 101642Y (2017) https://doi.org/10.1117/12.2259896

KEYWORDS: Metamaterials, Vibration isolation, Systems modeling, System integration, Wave propagation, Transmittance, Picosecond phenomena, Ferroelectric materials, Inductance, Finite element methods, Smart structures, Photonic crystals

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Proceedings Article | 15 April 2016 Presentation + Paper

Periodic substructure for multi-frequency energy harvesting with single piezoelectric patch

F. Braghin, I. Mehdipour, N. Lecis, C. Galassi

Proceedings Volume 9799, 97990O (2016) https://doi.org/10.1117/12.2219547

KEYWORDS: Magnetism, Energy harvesting, Prototyping, Ceramics, Energy efficiency, Ferroelectric materials, Neodymium, Electromagnetism, Magnetic sensors, Sensors

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Proceedings Article | 15 April 2016 Presentation + Paper

Optimal layout of piezo patches and control circuit parameters for vibration damping of a bounded beam using switching control

Gabriele Cazzulani, Francesco Braghin, Fabrizio Mazzocchi

Proceedings Volume 9799, 97991V (2016) https://doi.org/10.1117/12.2219537

KEYWORDS: Switching, Switches, Vibration control, Control systems, Actuators, Circuit switching, Vibration isolation, Piezoelectric effects, Resistance, Inductance, Electrodes

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Proceedings Article | 15 April 2016 Paper

Interaction of multiple actuators for synchronized switching damping control

Gabriele Cazzulani, Francesco Braghin, Fabrizio Mazzocchi

Proceedings Volume 9799, 97991D (2016) https://doi.org/10.1117/12.2219555

KEYWORDS: Piezoelectric effects, Actuators, Switching, Vibration control, Circuit switching, Control systems, Vibration isolation, Switches, Sensors, Resistance, Inductance

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Proceedings Article | 10 April 2014 Paper

On the use of electrical and optical strain gauges paired to magnetostrictive patch actuators

Francesco Braghin, Simone Cinquemani, Gabriele Cazzulani, Lorenzo Comolli

Proceedings Volume 9061, 906133 (2014) https://doi.org/10.1117/12.2045044

KEYWORDS: Actuators, Sensors, Fiber Bragg gratings, Magnetism, Vibration control, Control systems, Magnetostrictive materials, Magnetic sensors, Electromagnetism, Optical sensors

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Proceedings Article | 10 March 2014 Paper

Vibration control of shell-like structures with optical strain sensors

Simone Cinquemani, Gabriele Cazzulani, Francesco Braghin

Proceedings Volume 9057, 90572Z (2014) https://doi.org/10.1117/12.2045043

KEYWORDS: Sensors, Fiber Bragg gratings, Actuators, Control systems, Carbon, Vibration control, Active vibration control, Smart structures, Ferroelectric materials, Structured optical fibers

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Proceedings Article | 19 April 2013 Paper

Averaging sensors technique for active vibration control applications

S. Cinquemani, G. Cazzulani, F. Braghin, F. Resta

Proceedings Volume 8692, 869231 (2013) https://doi.org/10.1117/12.2009713

KEYWORDS: Sensors, Fiber Bragg gratings, Actuators, Control systems, Active vibration control, Smart structures, Ferroelectric materials, Carbon, Vibration control, Optical fibers

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Proceedings Article | 10 April 2013 Paper

Analysis and modeling of a piezoelectric energy harvester for powering a wireless sensor

Marco Bassetti, Francesco Braghin, Damiano Milani, Francesco Ripamonti, Gisella Tomasini

Proceedings Volume 8688, 86882A (2013) https://doi.org/10.1117/12.2012239

KEYWORDS: Sensors, Transformers, Electroluminescent displays, Energy harvesting, Resistance, Resistors, Finite element methods, Transducers, Electronic circuits, Electronic components

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Proceedings Article | 10 April 2013 Paper

An active control logic to improve the fatigue strength of smart flexible structures

Pasquale Ambrosio, Francesco Braghin, Ferruccio Resta, Francesco Ripamonti

Proceedings Volume 8688, 86881U (2013) https://doi.org/10.1117/12.2009678

KEYWORDS: Logic, Control systems, Vibration control, Smart structures, Adaptive control, Sensors, Active vibration control, Actuators, Carbon, Epoxies

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Showing 5 of 16 publications

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