scholarly journals Piezoelectric Vibration-Based Energy Harvesting Enhancement Exploiting Nonsmoothness

Actuators ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 25 ◽  
Author(s):  
Rodrigo Ai ◽  
Luciana Monteiro ◽  
Paulo Monteiro ◽  
Pedro Pacheco ◽  
Marcelo Savi
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Nonlinear Effects ◽  
Dynamical Analysis ◽  
Portable Devices ◽  
Energy Capacity ◽  
Resonance Frequencies ◽  
Harvesting Systems ◽  
Displacement Constraints ◽  
Piezoelectric Vibration

Piezoelectric vibration-based energy harvesting systems have been used as an interesting alternative power source for actuators and portable devices. These systems have an inherent disadvantage when operating in linear conditions, presenting a maximum power output by matching their resonance frequencies with the ambient source frequencies. Based on that, there is a significant reduction of the output power due to small frequency deviations, resulting in a narrowband harvester system. Nonlinearities have been shown to play an important role in enhancing the harvesting capacity. This work deals with the use of nonsmooth nonlinearities to obtain a broadband harvesting system. A numerical investigation is undertaken considering a single-degree-of-freedom model with a mechanical end-stop. The results show that impacts can strongly modify the system dynamics, resulting in an increased broadband output power harvesting performance and introducing nonlinear effects as dynamical jumps. Nonsmoothness can increase the bandwidth of the harvesting system but, on the other hand, limits the energy capacity due to displacement constraints. A parametric analysis is carried out monitoring the energy capacity, and two main end-stop characteristics are explored: end-stop stiffness and gap. Dynamical analysis using proper nonlinear tools such as Poincaré maps, bifurcation diagrams, and phase spaces is performed together with the analysis of the device output power and efficiency. This offers a deep comprehension of the energy harvesting system, evaluating different possibilities related to complex behaviors such as dynamical jumps, bifurcations, and chaos.

A Study on Bandwidth and Performance Limitations of Array Vibration Harvester Configurations

2019 ◽  
Vol 4 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Noha Aboulfotoh ◽  
Jens Twiefel
Keyword(s):  
Energy Harvesting ◽  
Lower Limit ◽  
Output Power ◽  
Theoretical Study ◽  
Design Guidelines ◽  
Single Element ◽  
Upper Limit ◽  
Resonance Frequencies ◽  
And Performance ◽  
Power Capability

Abstract Many researchers introduced an array of generators for broadband energy harvesting. The array has been studied in comparison to a single element from this array, but never compared to a single reference harvester with same volume as the whole array. This paper presents a theoretical study of evaluating the performance of the array harvester in comparison to the reference harvester. Power from the reference harvester as well as from the array is analytically calculated. The array is compared to the reference harvester when loaded by their optimal resistances which provide maximum power capability. The comparison is divided into two sections: firstly when the elements of the array are tuned to resonate at matching frequencies and secondly when they are tuned to non-matching resonance frequencies. The comparisons lead to two significant limits of the working bandwidth of the array: the lower and the upper limit. Between the two limits, the power produced from the array is less than the reference harvester, but with a small additional bandwidth. Below the lower limit, the array has no advantage over the reference harvester. Above the upper limit, output power of the array is inconsistent. Hence, design guidelines for the array are provided.

LTCC Piezoelectric Transducer for Energy Harvesting

2015 ◽  
Vol 2015 (CICMT) ◽  
pp. 000105-000111
Author(s):  
Arkadiusz P. Dabrowski ◽  
Slawomir Owczarzak ◽  
Henryk Roguszczak ◽  
Leszek J. Golonka
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Lead Zirconate Titanate ◽  
Piezoelectric Transducer ◽  
Lead Zirconate ◽  
Mean Power ◽  
Optimum Load ◽  
Resonance Frequencies ◽  
The Mean ◽  
The Difference

In this paper, design, technology and properties of multi cantilever transducer for energy harvesting application were described. The piezoelectric transducer was made in LTCC (Low Temperature Cofired Ceramics) technology using PZT (Lead Zirconate-Titanate) based tape. In such devices the highest power can be reached at resonance frequencies of the cantilevers. Eight bimorph transducers with lengths corresponding to 33, 50, 58, 66, 75, 82, 91 and 100 Hz resonant frequency, were designed. The transducers were polarized in serial or parallel configuration. To avoid voltage reduction in the system of a few piezoelectric bimorphs, rectifiers were applied for each cantilever. Transducers had optimum resistance in ranges of 60–140 kΩ and 300–600 kΩ for bimorphs poled in parallel and serial configuration, respectively. The mean output power under sinusoidal excitation with 20 μm vibration amplitude calculated from all maxima at resonant frequencies for optimum load, were equal to 10.3 μW and 12.4μW for parallel and serial configurations with rectifier. Without rectifier the values were equal to 18.2 μW for both the transducers. In case of mean output power, the difference between both the transducers was not really significant, however at higher frequency the maximum power was higher for serial configuration. Besides, the output voltage obtained in serial bimorph was higher than in parallel one. The mean power density for all the resonant peaks measured at 0.41 g was equal to 210 μW/cm3/g and 360 μW/cm3/g with and without rectifier, respectively.

scholarly journals Chaotic Dynamics-Based Analysis of Broadband Piezoelectric Vibration Energy Harvesting Enhanced by Using Nonlinearity

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Zhongsheng Chen ◽  
Bin Guo ◽  
Congcong Cheng ◽  
Hongwu Shi ◽  
Yongmin Yang
Keyword(s):  
Energy Harvesting ◽  
Chaotic Dynamics ◽  
State Space Model ◽  
Excitation Amplitude ◽  
Single Frequency ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Piezoelectric Cantilever ◽  
Harvesting Systems ◽  
Piezoelectric Vibration

Nonlinear magnetic forces are always used to enlarge resonant bandwidth of vibration energy harvesting systems with piezoelectric cantilever beams. However, how to determine properly the distance between two magnets is one of the key engineering problems. In this paper, the Melnikov theory is introduced to overcome it. Firstly, the Melnikov state-space model of the nonlinear piezoelectric vibration energy harvesting (PVEH) system is built. Based on it, chaotic dynamics mechanisms of achieving broadband PVEH by nonlinearity are exposed by potential function of the unperturbed nonlinear PVEH system. Then the corresponding Melnikov function of the nonlinear PVEH system is defined, based on which two Melnikov necessary conditions of determining the distance are obtained. Finally, numerical simulations are done to testify the theoretic results. The results demonstrate that the distance is closely related to the excitation amplitude and frequency once geometric and material parameters are fixed. Under a single-frequency excitation, the nonlinear PVEH system can generate a periodic vibration around a stable point, a large-amplitude vibration around two stable points, or a chaotic vibration. The proposed method is very valuable for optimally designing and utilizing nonlinear broadband PVEH devices in engineering applications.

scholarly journals Optimization of a Tunable Piezoelectric Harvester Applied to Multimodal Structures

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Stella Brach ◽  
Giovanni Caruso ◽  
Giuseppe Vairo
Keyword(s):  
Energy Harvesting ◽  
Degrees Of Freedom ◽  
Piezoelectric Materials ◽  
Electric Circuit ◽  
Portable Devices ◽  
Vibration Source ◽  
Vibration Modes ◽  
Resonance Frequencies ◽  
Constant Growth ◽  
Piezoelectric Harvester

The field of energy harvesting experienced a constant growth in the last years, due to the possibility of developing standing-alone wireless portable devices with extended life. In this context, piezoelectric materials appear to be particularly effective for the development of harvesters able to scavenge energy from ambient vibrations. In this paper a piezoactuated cantilever beam used for energy harvesting purposes is considered, extracting energy from a vibration source applied at the clamped boundary. The piezoelectric dimensions and position are optimized in order to maximize the coupling on the vibration modes of interest. An electric circuit containing a resistor and an inductor, connected to the piezoelectric electrodes, is optimized, for extracting the maximum electric power for any frequency of the vibration source, accounting for several vibration modes of the structure. The inductance is used to compensate the presence of a mistuning between the vibration source and the cantilever resonance frequencies. Proposed analysis shows that a single inductance is much effective when the harvester can be treated essentially as a single-degree-of-freedom structure. For harvesters with multiple degrees-of-freedom a single inductance can perform only a trade-off compensation of the mistuning between the various modes.

Numerical investigation of nonlinear mechanical and constitutive effects on piezoelectric vibration-based energy harvesting

2018 ◽  
Vol 85 (9) ◽  
pp. 565-579 ◽  
Author(s):  
Ana Carolina Cellular ◽  
Luciana L. da Silva Monteiro ◽  
Marcelo A. Savi
Keyword(s):  
Energy Harvesting ◽  
Numerical Investigation ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Dynamical Behavior ◽  
Nonlinear Effects ◽  
Electrical Energy ◽  
Coupling Model ◽  
Mechanical Coupling ◽  
Piezoelectric Vibration

Abstract Vibration-based energy harvesting has the main objective to convert available environmental mechanical energy into electrical energy. Piezoelectric materials are usually employed to promote the mechanical-electrical conversion. This work deals with a numerical investigation that analyzes the influence of nonlinear effects in piezoelectric vibration-based energy harvesting. Duffing-type oscillator that can be either monostable or bistable represents mechanical nonlinearities. A quadratic constitutive electro-mechanical coupling model represents piezoelectric nonlinearities. The system performance is evaluated for different system characteristics being monitored by the input and the generated power. Numerical simulations are carried out exploring dynamical behavior of energy harvesting system evaluating different kinds of responses, including periodic and chaotic regimes.

High-Efficiency Millimeter-Wave Energy-Harvesting Systems With Milliwatt-Level Output Power

2017 ◽  
Vol 64 (6) ◽  
pp. 605-609 ◽  
Author(s):  
Med Nariman ◽  
Farid Shirinfar ◽  
Sudhakar Pamarti ◽  
Ahmadreza Rofougaran ◽  
Franco De Flaviis
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Millimeter Wave ◽  
Wave Energy ◽  
High Efficiency ◽  
Harvesting Systems

scholarly journals Triboelectric Energy Harvesting Response of Different Polymer-Based Materials

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4980
Author(s):  
Tiago Rodrigues-Marinho ◽  
Nelson Castro ◽  
Vitor Correia ◽  
Pedro Costa ◽  
Senentxu Lanceros-Méndez
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Polyvinylidene Fluoride ◽  
Light Emission ◽  
Mechanical Energy ◽  
Harvesting Systems ◽  
Self Powered ◽  
Triboelectric Nanogenerators ◽  
Vertical Contact ◽  
The Internet Of Things

Energy harvesting systems for low-power devices are increasingly being a requirement within the context of the Internet of Things and, in particular, for self-powered sensors in remote or inaccessible locations. Triboelectric nanogenerators are a suitable approach for harvesting environmental mechanical energy otherwise wasted in nature. This work reports on the evaluation of the output power of different polymer and polymer composites, by using the triboelectric contact-separation systems (10 N of force followed by 5 cm of separation per cycle). Different materials were used as positive (Mica, polyamide (PA66) and styrene/ethylene-butadiene/styrene (SEBS)) and negative (polyvinylidene fluoride (PVDF), polyurethane (PU), polypropylene (PP) and Kapton) charge materials. The obtained output power ranges from 0.2 to 5.9 mW, depending on the pair of materials, for an active area of 46.4 cm2. The highest response was obtained for Mica with PVDF composites with 30 wt.% of barium titanate (BT) and PA66 with PU pairs. A simple application has been developed based on vertical contact-separation mode, able to power up light emission diodes (LEDs) with around 30 cycles to charge a capacitor. Further, the capacitor can be charged in one triboelectric cycle if an area of 0.14 m2 is used.

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