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IEEE Conference on Electromagnetic Field Computation

作者： Paolo Bettini Roberto Benato Sebastian Dambone Sessa Ruben Specogna Department of Industrial Engineering (DII) University of Padova Padova Italy Polytechnic Department of Engineering and Architecture (DPIA) University of Udine Udine Italy

ISBN: (纸本)9781509010332

This paper presents a novel technique to perform the topological pre-processing needed in formulations based on an electric vector potential and a magnetic scalar potential when the eddy current problem being solved is subject to periodic boundary conditions (PBC). In this case, in fact, all the techniques to produce the generators for the first cohomology group introduced in literature cannot be used. The novel technique is very fast and it is used to model cables for power delivery.

关键词： Generators Boundary conditions Conductors Benchmark testing Eddy currents Electric potential Convergence

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Intermixed Product and Service Boundaries: Exploring Servitization in Sheet Metal Industry

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Procedia CIRP 2016年 47卷 258-263页

作者： Antonella Meneghetti Silvia Moro Petri Helo DPIA - Polytechnic Department of Engineering and Architecture University of Udine Udine 33100 Italy Networked Value Systems Department of Production University of Vaasa Vaasa FI 65100 Finland

In the sheet metal industry, single machines or more complex production systems are integrated with a software needed to control them. While it is clear both for the company and the client that the machine is a product offered with the related services, the software deserves more attention. In the company where our team has been involved in an action research program, the software is conceived as a product with its related services, but this concept has not been properly transmitted to clients, who don’t recognize it and pretend software services for free. In this industry, machinery is linked to its software and both are enhanced by the related services, so the final product-service bundle should be made by four components. In order to better clarify this concept and illustrate the solutions our research team has identified to promote a complete PSS offer, the four-leg chair metaphor is proposed. The proper value of the whole PSS offer can be transmitted by an effective communication process, supporting sales people with instruments such as predefined packets for software services. Organisational changes should be adopted such as job enlargement for software technicians and cross-training with salespeople. By the former, software technicians, who are frontline employees in direct contact with customers during the training phase, can be transformed into internal entrepreneurs by proper incentives. Since they lack marketing education and sometimes trust of salespeople, cross-training is proposed as an effective way to keep in touch software technicians with salespeople with mutual learning.

关键词： Machinery industry Product-Service Systems machine software internal entrapreneurs cross-training

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Energy-efficient motion planning for robotic systems using polynomials in the Chebyshev basis

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Robotics and Autonomous Systems 2025年 192卷

作者： Robbe De Laet Nick Van Oosterwyck Lorenzo Scalera Annie Cuyt Alessandro Gasparetto Stijn Derammelaere Department of Electromechanics CoSys-Lab University of Antwerp CGB Groenenborgerlaan 171 2020 Antwerpen Belgium AnSyMo/Cosys Flanders Make the strategic research center for the manufacturing industry Belgium Polytechnic Department of Engineering and Architecture (DPIA) University of Udine Via delle Scienze 206 33100 Udine Italy Department of Computer Science Computational Mathematics University of Antwerp CMI Middelheimlaan 1 2020 Antwerpen Belgium Division of Computing Science and Mathematics University of Stirling Stirling FK9 4LA Scotland United Kingdom

Motion profile optimization is a powerful technique for enhancing the efficiency of robotic systems without necessitating hardware modifications. Nonetheless, the prevailing usage of piecewise or polynomial position functions can often require a high number of design parameters or result in unbounded optimization problems. This paper presents a novel approach employing polynomials expressed in the Chebyshev basis for the position function of multi-degree-of-freedom (DOF) systems, enabling substantial performance improvements with a minimal number of design parameters while enabling the use of a bounded design space. More specifically, this work focuses on reducing energy consumption while maintaining a fixed motion time. Moreover, by symbolically formulating the motion profile, it is demonstrated that kinematic constraints can be linearized, leading to accelerated convergence in the optimization process. To illustrate the robustness of the proposed method under different operational conditions, optimizations were executed on three distinct motion tasks and a range of payload values, and compared to a state-of-the-art method. Experimental results strongly validate the effectiveness of the proposed approach, demonstrating a reduction in root mean square (rms) torque by up to −47.6% with a limited number of design parameters for each joint.

关键词： Robotic arms

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Modeling the cyclic plasticity behavior of 42CrMo4 steel with an isotropic model calibrated on the whole shape of the evolution curve

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Procedia Structural Integrity 2020年 28卷 53-60页

作者： Jelena Srnec Novak Marina Franulović Denis Benasciutti Francesco De Bona Polytechnic Department of Engineering and Architecture (DPIA) University of Udine via delle Scienze 206 33100 Udine Italy Faculty of Engineering University of Rijeka Croatia Department of Engineering University of Ferrara via Saragat 1 44122 Ferrara Italy

A durability analysis of a mechanical component generally requires accurate numerical simulations. For this purpose, the adopted cyclic plasticity material model should follow as closely as possible the material behavior observed during experimental testing. This work presents calibration of the isotropic material model for a 42CrMo4 steel, based on a series of cyclic fully-reversed tension-compression strain controlled tests performed at different strain amplitudes. Stress-strain cycles were recorded until end of each test with the goal to capture the isotropic stabilization effect of the material. As the isotropic model calibration gave poor results, if the exponential law proposed by Voce is adopted, an alternative Three parameters (TP) isotropic model is thus considered. The comparison with the experimental results show that the TP model fits significantly better the experimental results in almost all the considered cases. A possible justification of such improvement seems to be related to the fact that the equation governing the TP model contain a parameter that controls also the slope of the “S-shape curve” which describes the evolution of the material from initial to stabilized condition.

关键词： low-alloy 42CrMo4 steel material characterization isotropic model cyclic plasticity

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Energy benefit assessment of a water loop heat pump system integrated with a CO 2 commercial refrigeration unit

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Energy Procedia 2017年 123卷 36-45页

作者： Alessio Polzot Chiara Dipasquale Paola D’Agaro Giovanni Cortella University of Udine Polytechnic Department of Engineering and Architecture (DPIA) via delle Scienze 206 33100 Udine Italy Eurac Research Institute of Renewable Energy viale Druso 1 39100 Bolzano Italy

The improvement of energy efficiency and the use of environmentally friendly working fluids are key elements of current European policies. Supermarkets are intensive energy consumers and approximately the 40% of their annual energy consumption is for refrigeration. Direct emissions of greenhouse gases associated with the use of high Global Warming Potential (GWP) refrigerants, and the indirect impact on the environment related to high electrical energy consumption, make shopping malls not sustainable buildings. This paper analyses the energy saving potential of integrated supermarket air conditioning and refrigeration systems using a Water Loop Heat Pump system (WLHP). A basic CO 2 booster commercial refrigeration system, applied to cold rooms and display cabinets, is considered. Heat recovery from the refrigeration circuit is performed in the heating season, while in the cooling season a dry cooler on the water loop allows heat rejection to outdoors. The building and all systems are modelled in the Trnsys environment taking into account the hourly weather data, the simulated daily profiles of the cooling and heating load demand and the request from refrigerated food storage equipment. Such a model allows a thorough understanding of the potential for energy savings with heat recovery solutions.

关键词： CO 2 booster system control strategies HVAC integration supermarket

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A Fast and Efficient Simulation Method for Inductive Position Sensors Design

A Fast and Efficient Simulation Method for Inductive Positio...

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IEEE Sensors

作者： Mauro Passarotto Gentjan Qama Ruben Specogna Polytechnic Department of Engineering and Architecture (DPIA) Università di Udine Udine Italy Munich Design Office IDT Europe GmbH München Germany

Inductive position sensors (IPSs) are contactless sensors used for detecting the absolute position of an item in case of angular or linear motion. The active sensing part is manufactured by positioning copper traces on a printed circuit board (PCB) in order to obtain a system of transmitting and receiving coils. A designing procedure based on trial-and-error method is not considerable because of the low time and costs efficiency of the process. Therefore, the here presented coil design process aims at efficiently evaluating the performance of each sensor before its industrial production and application. The simulation is based on the sequential solution of different eddy current problems in the frequency domain by using a fast and efficient surface integral formulation in place of the much more widely diffused commercial finite element (FE) codes. Due to this innovative practice, simulation time can be reduced to some tens of seconds thus allowing the evaluation of many design and the final performance of the sensor can be deeply enhanced, reducing the maximum linearity error from more than 2% up to 0.2% FS.

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Automatic MTPA tracking in IPMSM drives: Loop dynamics, design and auto-tuning

Automatic MTPA tracking in IPMSM drives: Loop dynamics, desi...

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IEEE Energy Conversion Congress and Exposition

作者： Sandro Calligaro Christian Olsen Roberto Petrella Nicola Bedetti Polytechnic Department of Engineering and Architecture (DPIA) University of Udine Udine Italy Drives and Motion Control Unit (DMCU) Gefran s.p.a. Gerenzano Varese Italy

ISBN: (纸本)9781509007387

In the control of Interior Permanent Magnet Synchronous Machines (IPMSMs), Maximum Torque Per Ampere (MTPA) based on motor parameters is a common approach to achieve high efficiency and torque density. Parametric uncertainty (e.g. due to identification errors, magnetic saturation or temperature variation) results in undesired deviation from the optimal operating trajectory. To solve this problem, MTPA tracking methods have been proposed, which exploit signal injection to search the minimum current point for a certain load torque, in a closed-loop fashion. For one of these methods, [13], stability of the non-linear dynamics was analyzed, and an upper bound for the convergence time was found, but no explicit method was proposed for the design of the tracking regulator. In this paper this last topic is addressed. By introducing some approximations, the linearized system is calculated and a loop transfer function obtained, which is invariant with the operating point. Thus, by means of a very simple design rule (i.e. suitable for auto-tuning), the MTPA tracking regulator gains can be designed in order to obtain the desired bandwidth. The method has been studied analytically and in simulation, also considering the influence of noise and parametric uncertainties. Finally the technique has been implemented on the hardware of a commercial industrial drive, proving the effectiveness of the proposal.

关键词： auto-tuning MTPA tracking linearization

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Identification of Axon Bendings in Neurons by Multiphysics FEM Simulations of High-Density MEA Extracellular Recordings

Identification of Axon Bendings in Neurons by Multiphysics F...

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IEEE SENSORS

作者： Federico Leva Andrea Corna Paul Werginz Pierpaolo Palestri Günter Zeck Luca Selmi Department of Engineering “Enzo Ferrari” Università degli studi di Modena e Reggio Emilia Modena Italy Institute of Biomedical Electronics Technische Universität Wien Vienna Austria DPIA Polytechnic Department of Engineering and Architecture University of Udine Udine Italy

A three-dimensional finite element method (FEM) simulation of a neuron (retinal ganglion cell) interfaced to a high-density CMOS-based microelectrode array (MEA) is performed and compared to recordings. The adopted multiscale simulation approach accurately reproduces the signals recorded by the patch clamp and the MEA sensors. The simulation leads us to identify bendings of the axon initial segment of a few neurons embedded in tissue, which are reported here for the first time.

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Adiabatic leaky integrate and fire neurons with refractory period for ultra low energy neuromorphic computing

npj Unconventional Computing

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npj Unconventional Computing 2024年第1期1卷 1-11页

作者： Marco Massarotto Stefano Saggini Mirko Loghi David Esseni DPIA—Polytechnic Department of Engineering and Architecture University of Udine Udine Italy

In recent years, the in-memory-computing in charge domain has gained significant interest as a promising solution to further enhance the energy efficiency of neuromorphic hardware. In this work, we explore the synergy between the brain-inspired computation and the adiabatic paradigm by presenting an adiabatic Leaky Integrate-and-Fire neuron in 180 nm CMOS technology, that is able to emulate the most important primitives for a valuable neuromorphic computation, such as the accumulation of the incoming input spikes, an exponential leakage of the membrane potential and a tunable refractory period. Differently from previous contributions in the literature, our design can exploit both the charging and recovery phases of the adiabatic operation to ensure a seamless and continuous computation, all the while exchanging energy with the power supply with an efficiency higher than 90% over a wide range of resonance frequencies, and even surpassing 99% for the lowest frequencies. Our simulations unveil a minimum energy per synaptic operation of 470 fJ at a 500 kHz resonance frequency, which yields a 9x energy saving with respect to a non-adiabatic operation.

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Young drivers’ pedestrian anti-collision braking operation data modelling for ADAS development

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Transportation Research Procedia 2022年 60卷 432-439页

作者： Matteo Miani Matteo Dunnhofer Christian Micheloni Andrea Marini Nicola Baldo Polytechnic Department of Engineering and Architecture (DPIA) University of Udine Via del Cotonificio 114 33100 Udine Italy Department of Mathematics Computer Science and Physics (DMIF) University of Udine Via delle Scienze 206 33100 Udine Italy Department of Languages Literatures Communication Education and Society (DILL) University of Udine Via Margreth 3 33100 Udine Italy Claudiana—Landesfachhochschule für Gesundheitsberufe I-39100 Bolzano Italy

Smart cities and smart mobility come from intelligent systems designed by humans. Artificial Intelligence (AI) is contributing significantly to the development of these systems, and the automotive industry is the most prominent example of "smart" technology entering the market: there are Advanced Driver Assistance System (ADAS), Radar/LIDAR detection units and camera-based Computer Vision systems that can assess driving conditions. Actually, these technologies have become consumer goods and services in mass-produced vehicles to provide human drivers with tools for a more comfortable and safer driving. Nevertheless, they need to be further improved for progress in the transition to fully automated driving or simply to increase vehicle automation levels. To this end, it becomes imperative to accurately predict driver’s decisions, model human driving behaviors, and introduce more accurate risk assessment metrics. This paper presents a system that can learn to predict the future braking behavior of a driver in a typically urban vehicle-pedestrian conflict, i.e., when a pedestrian enters a zebra crossing from the curb and a vehicle is approaching. The algorithm proposes a sequential prediction of relevant operational indicators that continuously describe the encounter process. A car driving simulator was used to collect reliable data on braking behaviours of a cohort of 68 licensed university students, who faced the same urban scenario. The vehicle speed, steering wheel angle, and pedal activity were recorded as the participants approached the crosswalk, along with the azimuth angle of the pedestrian and the relative longitudinal distance between the vehicle and the pedestrian: the proposed system employs the vehicle information as human driving decisions and the pedestrian information as explanatory variables of the environmental state. In fact, the pedestrian’s polar coordinates are usually calculated by an on-board millimeter-wave radar which is typically used to perc

关键词： ADAS Traffic safety Driver behaviour Gated Recurrent Units Driving simulator

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