Digitala Vetenskapliga Arkivet

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  • 1.
    Staaf, Henrik
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Matsson, Simon
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Sepheri, Sobhan
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Köhler, Elof
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Daoud, Kaies
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Breas AB, Sweden.
    Ahrentorp, Fredrik
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Jonasson, Christian
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Folkow, Peter
    Chalmers University of Technology, Sweden.
    Ryynänen, Leena
    Nokian Tyres Plc, Finland.
    Penttila, Mika
    Nokian Tyres Plc, Finland.
    Rusu, Cristina
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Simulated and measured piezoelectric energy harvesting of dynamic load in tires2024In: Heliyon, E-ISSN 2405-8440, Vol. 10, no 7, article id e29043Article in journal (Refereed)
    Abstract [en]

    From 2007 in US and from 2022 in EU it is mandatory to use TPMS monitoring in new cars. Sensors mounted in tires require a continuous power supply, which currently only is from batteries. Piezoelectric energy harvesting is a promising technology to harvest energy from tire movement and deformation to prolong usage of batteries and even avoid them inside tires. This study presents a simpler method to simultaneous model the tire deformation and piezoelectric harvester performance by using a new simulation approach - dynamic bending zone. For this, angular and initial velocities were used for rolling motion, while angled polarization was introduced in the model for the piezoelectric material to generate correct voltage from tire deformation. We combined this numerical simulation in COMSOL Multiphysics with real-life measurements of electrical output of a piezoelectric energy harvester that was mounted onto a tire. This modelling approach allowed for 10 times decrease in simulation time as well as simpler investigation of systems parameters influencing the output power. By using experimental data, the simulation could be fine-tuned for material properties and for easier extrapolation of tire deformation with output harvested energy from simulations done at low velocity to the high velocity experimental data.

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  • 2.
    Romani, Aldo
    et al.
    University of Bologna, Italy.
    Rusu, Cristina
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Staaf, Henrik
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Avetisova, Ksenia
    TietoEVRY, Finland.
    The ENERGY ECS Project: Smart and Secure Energy Solutions for Future Mobility2023In: 2023 AEIT International Conference on Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE), IEEE , 2023Conference paper (Refereed)
    Abstract [en]

    Electric and smart mobility are key enablers for their green energy transition. However, the electrification of vehicles poses several challenges, from the development of power components to the organization of the electric grid system. Moreover, it is expected that the smartification of mobility via sensors and novel transport paradigms will play an essential role in the reduction of the consumed energy. In response to these challenges and expectations, the ENERGY ECS project is pursuing smart and secure energy solutions for the mobility of the future, by developing power components, battery charging electronics, and self-powered sensors for condition monitoring, along with advanced techniques for grid management, applications of artificial intelligence, machine learning and immersing technologies. This paper presents the project’s objectives and reports intermediate results from the perspective of the targeted use cases.

  • 3. Hassanein, Moataz
    Translation from Arabic into Italian of the first chapter of the novel "2063" by Moataz Hassanein2022In: ArabPop: Rivista di Arti e Letterature Arabe Contemporanee / [ed] Chiara Comito, Fernanda Fischione, Anna Gabai, Silvia Moresi, Olga Solombrino, Napoli: TAMU EDIZIONI , 2022, p. 29-31Chapter in book (Other (popular science, discussion, etc.))
  • 4.
    Staaf, Henrik
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Sawatdee, Anurak
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Rusu, Cristina
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Nilsson, David
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Schäffner, Philipp
    Joanneum Research Forschungsgesellschaft mbH, Austria.
    Johansson, Christer
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    High magnetoelectric coupling of Metglas and P(VDF-TrFE) laminates2022In: Scientific Reports, Vol. 12, no 1, article id 5233Article in journal (Refereed)
    Abstract [en]

    Magnetoelectric (magnetic/piezoelectric) heterostructures bring new functionalities to develop novel transducer devices such as (wireless) sensors or energy harvesters and thus have been attracting research interest in the last years. We have studied the magnetoelectric coupling between Metglas films (2826 MB) and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) in a laminate structure. The metallic Metglas film itself served as bottom electrode and as top electrode we used an electrically conductive polymer, poly(3,4-ethylene-dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). Besides a direct electrical wiring via a graphite ink, a novel contactless readout method is presented using a capacitive coupling between the PEDOT:PSS layer and an electrode not in contact with the PEDOT:PSS layer. From the experimental result we determined a magnetoelectric coupling of 1445 V/(cm·Oe) at the magnetoelastic resonance of the structure, which is among the highest reported values for laminate structures of a magnetostrictive and a piezoelectric polymer layer. With the noncontact readout method, a magnetoelectric coupling of about 950 V/(cm·Oe) could be achieved, which surpasses previously reported values for the case of direct sample contacting. 2D laser Doppler vibrometer measurements in combination with FE simulations were applied to reveal the complex vibration pattern resulting in the strong resonant response.

  • 5.
    Pamfil, Bogdan
    et al.
    Chalmers University of Technology, Sweden.
    Palm, Richard
    Chalmers University of Technology, Sweden.
    Vyas, Agin
    Chalmers University of Technology, Sweden.
    Staaf, Henrik
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Rusu, Cristina
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Folkow, Peter D.
    Chalmers University of Technology, Sweden.
    Multi-Objective Design Optimization of Fractal-based Piezoelectric Energy Harvester2021In: 2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), 2021, p. 96-99Conference paper (Refereed)
    Abstract [en]

    This paper studies optimization solutions for a proof-of-concept design methodology for a fractal-based tree energy harvester with a stress distribution optimized structure. The focus is on obtaining a sufficiently high-power output and a high enough stress in the longitudinal branch direction by using Frequency Response Functions. The design methodology shows that using the MATLAB code with Sensitivity Analysis and Multi-objective Optimization in combination with elitist genetic algorithm enables an optimal design.

  • 6.
    Vyas, Agin
    et al.
    Chalmers University of Technology, Sweden.
    Staaf, Henrik
    Chalmers University of Technology, Sweden.
    Rusu, Cristina
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Ebefors, Thorbjörn
    MyVox AB, Sweden.
    Liljeholm, Jessica
    Silex Microsystems AB, Sweden.
    Smith, Anderson
    Chalmers University of Technology, Sweden.
    Lundgren, Per
    Chalmers University of Technology, Sweden.
    Enoksson, Peter
    Chalmers University of Technology, Sweden.
    A micromachined coupled-cantilever for piezoelectric energy harvesters2018In: Micromachines, E-ISSN 2072-666X, Vol. 9, no 5, article id 252Article in journal (Refereed)
    Abstract [en]

    This paper presents a demonstration of the feasibility of fabricating micro-cantilever harvesters with extended stress distribution and enhanced bandwidth by exploiting an M-shaped two-degrees-of-freedom design. The measured mechanical response of the fabricated device displays the predicted dual resonance peak behavior with the fundamental peak at the intended frequency. This design has the features of high energy conversion efficiency in a miniaturized environment where the available vibrational energy varies in frequency. It makes such a design suitable for future large volume production of integrated self powered sensors nodes for the Internet-of-Things

  • 7.
    Trabaldo, Edoardo
    et al.
    RISE, Swedish ICT, Acreo. Chalmers University of Technology, Sweden.
    Köhler, Elof
    Chalmers University of Technology, Sweden.
    Staaf, Henrik
    Chalmers University of Technology, Sweden.
    Enoksson, Peter
    Chalmers University of Technology, Sweden.
    Rusu, Cristina
    RISE, Swedish ICT, Acreo.
    Simulation of a novel bridge MEMS-PZT energy harvester for tire pressure system2014In: Journal of Physics: Conference Series, 2014, Vol. 557, no 1, article id 012041Conference paper (Refereed)
    Abstract [en]

    Self-powering is becoming an important issue for autonomous sensor systems. By having an on-the-go power source the life span increases in comparison to a limited battery source. In this paper, simulation of an innovative design for a piezoelectric energy harvester for Tire Pressure Measurement System (TPMS) is presented. The MEMS-based thin-film PZT harvester structure is in the form of a bridge with a big central seismic mass and multiple electrodes. This design takes the advantage of the S-profile bending and a short beam length to concentrate the piezoelectric effect in a small segment along the beam and maximize the power output for a given displacement. From simulation in Comsol Multiphysics, the 9mm × 5mm bridge, seismic mass of 8.7mg and resonance frequency of 615Hz, generates 1 μW by mechanical pulses excitation equivalent to driving at 60 km/h (roughly 180G).

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