Search results for: Alberto Corigliano

Items from 1 to 20 out of 65 results

article

Real‐time topology optimization via learnable mappings

Gabriel Garayalde, Matteo Torzoni, Matteo Bruggi, Alberto Corigliano

International Journal for Numerical Methods in Engineering > 125 > 15 > n/a - n/a

In traditional topology optimization, the computing time required to iteratively update the material distribution within a design domain strongly depends on the complexity or size of the problem, limiting its application in real engineering contexts. This work proposes a multi‐stage machine learning strategy that aims to predict an optimal topology and the related stress fields of interest, either...

article

Optimal 2D auxetic micro-structures with band gap

Matteo Bruggi, Alberto Corigliano

Meccanica > 2019 > 54 > 13 > 2001-2027

A systematic investigation is presented that explores band gap properties of periodic micro-structures architected for maximum auxeticity. The design of two-dimensional auxetic cells is addressed using inverse homogenization. A non-convex optimization problem is formulated that is solved through mathematical programming. Different starting guesses are used to explore local minima when distributing...

article

The First 3-D-Printed z-Axis Accelerometers With Differential Capacitive Sensing

Valentina Zega, Caterina Credi, Roberto Bernasconi, Giacomo Langfelder, more

IEEE Sensors Journal > 2018 > 18 > 1 > 53 - 60

In this paper, additive manufacturing and wet metallization process are combined to fabricate three prototypes of differential electro-mechanical

${z}$

-axis accelerometers. The smart combination of existing fabrication processes makes the proposed fabrication flow unique in the sensors field. The mechanical design of the three proposed devices exploits the three-dimensionality of the 3-D-printing...

article

Non linear response and optimization of a new z-axis resonant micro-accelerometer

Claudia Comi, Alberto Corigliano, Valentina Zega, Sarah Zerbini

Mechatronics > 2016 > 40 > C > 235-243

Micro-Electro-Mechanical Systems (MEMS) accelerometers are micro-sized devices largely used for detecting accelerations in the consumer and automotive market. Both capacitive and resonant sensing have been successfully employed in these devices.In the present work, the focus is on a z-axis resonant accelerometer recently proposed in [1] and fabricated with the Thelma^© surface-micromachining technique...

article

Synthesis of auxetic structures using optimization of compliant mechanisms and a micropolar material model

Matteo Bruggi, Valentina Zega, Alberto Corigliano

Structural and Multidisciplinary Optimization > 2017 > 55 > 1 > 1-12

Aim of this work is the synthesis of auxetic structures using a topology optimization approach for micropolar (or Cosserat) materials. A distributed compliant mechanism design problem is formulated, adopting a SIMP–like model to approximate the constitutive parameters of 2D micropolar bodies. The robustness of the proposed approach is assessed through numerical examples concerning the optimal design...

article

Evaluation of adhesion in microsystems using equivalent rough surfaces modeled with spherical caps

Raffaele Ardito, Attilio Frangi, Francesco Rizzini, Alberto Corigliano

European Journal of Mechanics - A/Solids > 2016 > 57 > C > 121-131

The correct evaluation of adhesion energy is a challenging task and even more difficulties are found when dealing with real-life surfaces in Micro-Electro-Mechanical Systems (MEMS). In this paper, we devise an effective tool for such a computation, on the basis of an innovative, yet simple, geometrical model for the description of rough surfaces by means of spherical caps. A mechanical model is devised...

chapter

Experimental-Numerical Assessment of Impact-Induced Damage in Cross-Ply Laminates

Gigliola Salerno, Stefano Mariani, Alberto Corigliano, Francesco Caimmi, more

Advanced Structured Materials > Computer Methods in Mechanics > Structural Mechanics > 493-504

In this work we provide an experimental-numerical investigation of impact-induced failure of layered composites. An experimental campaign, consisting of multiple drop tests, was performed to determine the delamination threshold (in the low-velocity regime) and to assess how, beyond this limit, failure mode is affected by the impact energy. A three-dimensional finite element model of the laminated...

article

Torsional Microresonator in the Nonlinear Regime: Experimental, Numerical and Analytical Characterization

Claudia Comi, Alberto Corigliano, Milena Doti, Alessandro Garatti, more

Procedia Engineering > 2016 > 168 > C > 933-936

The dynamic behavior of a torsional microresonator is characterized analytically, numerically and experimentally both in the linear and nonlinear regime. Starting from the work presented in [1], here, the highly nonlinear regime is considered and the dynamic pull-in is experienced. Very good agreement between experimental data and numerical model is found also when the analytical methods usually employed...

article

Improved one-dimensional model of piezoelectric laminates for energy harvesters including three dimensional effects

Giacomo Gafforelli, Raffaele Ardito, Alberto Corigliano

Composite Structures > 2015 > 127 > Complete > 369-381

The application of piezoelectric composites in energy harvesters is continuously increasing even at the microscale, with the immediate corollary of a fundamental need for improved computational tools for optimization of performances at the design level. In this paper, a refined, yet simple model is proposed with the aim of providing fast and insightful solutions to the multi-physics problem of energy...

article

An Efficient Earth Magnetic Field MEMS Sensor: Modeling, Experimental Results, and Optimization

Mehrdad Bagherinia, Matteo Bruggi, Alberto Corigliano, Stefano Mariani, more

Journal of Microelectromechanical Systems > 2015 > 24 > 4 > 887 - 895

A new

$z$

-axis Lorentz force microelectromechanical systems magnetometer was designed, fabricated, and tested. The proposed device is characterized by simple design, reduced dimensions, and high efficiency. Furthermore, possible parasitic acceleration sensitivity is mechanically canceled in the proposed device. The initial design was subsequently studied through an ad hoc formulated multiphysics...

chapter

Modelling and characterization of circular microplate electrostatic actuators for micropump applications

Emanuele Bertarelli, Alice Colnago, Raffaele Ardito, Gabriele Dubini, more

2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems > 1 - 7

2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE)

In the last decades, an increasing interest is being directed towards micropumps, the main component of active microfluidic systems. A current research aim is to pursue compact dimensions and low power consumption; a viable alternative is to exploit MEMS manufacturing techniques. This work presents the modelling and the characterization of microplate electrostatic actuators for micropump applications...

article

Numerical solution of the Duffing equation with random coefficients

Marcin Kamiński, Alberto Corigliano

Meccanica > 2015 > 50 > 7 > 1841-1853

The main aim of this work is numerical solution of the nonlinear vibrations of micro-resonators exhibiting bounded and Gaussian uncertainty in their parameters. The mechanical response in deterministic situation is described by the Duffing equation, whose numerical solution is obtained with the Runge–Kutta–Fehlenberg algorithm, while probabilistic analysis is carried out using the generalized stochastic...

chapter

Experimental verification of a bridge-shaped, non-linear vibration energy harvesters

Giacomo Gafforelli, Alberto Corigliano, Ruize Xu, Sang-Gook Kim

IEEE SENSORS 2014 Proceedings > 2175 - 2178

2014 IEEE Sensors

This paper reports the modeling and a first experimental characterization of a bridge-shaped doubly clamped nonlinear energy harvester. The doubly clamped beam at large deflection induces stretching strain in the layers in addition to the bending strain, which stiffens the beam as the beam deflects and transforms the dynamics to the nonlinear regime widening the frequency bandwidth. The sectional...

article

Advanced models for the calculation of capillary attraction in axisymmetric configurations

Raffaele Ardito, Alberto Corigliano, Attilio Frangi, Francesco Rizzini

European Journal of Mechanics / A Solids > 2014 > 47 > Complete > 298-308

The proper estimate of capillary attraction is of great importance in many situations, for example the reliability assessment of Micro- Electro-Mechanical Systems (MEMS) with respect to spontaneous adhesion. In spite of many theoretical studies, there is a lack of general methods for obtaining the exact shape of the liquid meniscus between the asperities of rough surfaces. In this paper, a new analytical...

article

A three-scale approach to the numerical simulation of metallic bonding for MEMS packaging

Aldo Ghisi, Stefano Mariani, Alberto Corigliano, Giorgio Allegato, more

Microelectronics Reliability > 2014 > 54 > 9-10 > 2039-2043

In this work we present a numerical, multi-scale approach to estimate the strength of a wafer-to-wafer metallic thermo-compression bonding. Following a top-down approach, the mechanical problem is handled at three different length scales. Taking into account control variables such as temperature, overall applied force over the wafer and contact surface roughness, it is shown that the proposed approach...

article

A domain decomposition approach for the simulation of fracture phenomena in polycrystalline microsystems

Federica Confalonieri, Aldo Ghisi, Giuseppe Cocchetti, Alberto Corigliano

Computer Methods in Applied Mechanics and Engineering > 2014 > 277 > Complete > 180-218

In this work, a domain decomposition technique is proposed to reduce the computational burden of three-dimensional numerical analyses of fracture processes in polycrystalline solids under dynamic loads. The material considered is polysilicon, which is the most widely employed structural material for Micro-Electro-Mechanical Systems (MEMS).The algorithm extends the proposal of Gravouil and Combescure...

chapter

Numerical simulations of piezoelectric MEMS energy harvesters

Giacomo Gafforelli, Raffaele Ardito, Alberto Corigliano, Carlo Valzasina, more

2014 15th International Conference on Thermal, Mechanical and Mulit-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE) > 1 - 9

2014 15th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE)

The application of piezoelectric materials in MEMS energy harvesters is continuously increasing, with the immediate corollary of a fundamental need for improved computational tools in order to optimize the performances at the design level. In this paper, a refined, yet simple model is proposed with the aim of providing fast and insightful solutions to the multi-physics problem of piezoelectric energy...

chapter

An efficient earth magnetic field MEMS sensor: Modelling and experimental results

Mehrdad Bagherinia, Alberto Corigliano, Stefano Mariani, David A. Horsley, more

2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS) > 700 - 703

2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS)

The paper presents the experimental results and performance indexes of a new z-axis Lorentz force MEMS magnetometer with simple design, reduced dimensions and high efficiency. An ad-hoc formulated multi-physics approach is exploited to compute the sensor dynamics. Possible parasitic acceleration sensitivity is mechanically canceled in the proposed device. Optimality of the proposed configuration is...

article

Microsystems and Mechanics

Alberto Corigliano, Raffaele Ardito, Claudia Comi, Attilio Frangi, more

Procedia IUTAM > 2014 > 10 > Complete > 138-160

Study, design and industrial production of microsystems implies complex processes in which many disciplines like physics, chemistry, material science, electronics and mechanics play a central role. This paper contains an overview of important mechanical aspects in design and reliability of microsystems. Starting from the past nine years experience of the research group with reference to real devices,...

article

A Differential Resonant Micro Accelerometer for Out-of-plane Measurements

Alessandro Caspani, Claudia Comi, Alberto Corigliano, Giacomo Langfelder, more

Procedia Engineering > 2014 > 87 > Complete > 640-643

This paper reports the theoretical and experimental characterization of a new z-axis silicon resonant micro accelerometer fabricated by the THELMA ^© surface micromachining technique, characterized by differential sensing and very small dimensions. The working principle of this device is based on the variation of the electrostatic stiffness of two torsional resonators. This work is a prosecution...

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INFONA - science communication portal

Search results for: Alberto Corigliano

Real‐time topology optimization via learnable mappings

Optimal 2D auxetic micro-structures with band gap

The First 3-D-Printed z-Axis Accelerometers With Differential Capacitive Sensing

Non linear response and optimization of a new z-axis resonant micro-accelerometer

Synthesis of auxetic structures using optimization of compliant mechanisms and a micropolar material model

Evaluation of adhesion in microsystems using equivalent rough surfaces modeled with spherical caps

Experimental-Numerical Assessment of Impact-Induced Damage in Cross-Ply Laminates

Torsional Microresonator in the Nonlinear Regime: Experimental, Numerical and Analytical Characterization

Improved one-dimensional model of piezoelectric laminates for energy harvesters including three dimensional effects

An Efficient Earth Magnetic Field MEMS Sensor: Modeling, Experimental Results, and Optimization

Modelling and characterization of circular microplate electrostatic actuators for micropump applications

Numerical solution of the Duffing equation with random coefficients

Experimental verification of a bridge-shaped, non-linear vibration energy harvesters

Advanced models for the calculation of capillary attraction in axisymmetric configurations

A three-scale approach to the numerical simulation of metallic bonding for MEMS packaging

A domain decomposition approach for the simulation of fracture phenomena in polycrystalline microsystems

Numerical simulations of piezoelectric MEMS energy harvesters

An efficient earth magnetic field MEMS sensor: Modelling and experimental results

Microsystems and Mechanics

A Differential Resonant Micro Accelerometer for Out-of-plane Measurements

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