scholarly journals Design and experimental validation of a pendulum energy harvester with string-driven single clutch mechanical motion rectifier

2021 ◽  
pp. 113237
Author(s):  
James Graves ◽  
Meiling Zhu
Keyword(s):  
Experimental Validation ◽  
Energy Harvester ◽  
Mechanical Motion

A Belleville-Spring Based Piezoelectric or Electromagnetic Energy Harvester

2014 ◽  
Author(s):  
Davide Castagnetti
Keyword(s):  
Energy Harvesting ◽  
Power Output ◽  
Experimental Validation ◽  
Energy Harvester ◽  
Elastic System ◽  
Low Frequency ◽  
Electromagnetic Energy ◽  
Frequency Range ◽  
Modal Response ◽  
Force Displacement

Energy harvesting from kinetic ambient energy requires converters able to efficiently operate in the low frequency range. A limit of the solutions proposed in the literature, both electromagnetic and piezoelectric, is their operating frequency, which generally ranges from about 50 to 300 Hz. To overcome these limitations, this work proposes an innovative energy harvester exploiting two counteracting Belleville springs. Thanks to the peculiar height to thickness ratio of the springs a highly compliant elastic system is obtained, which can be used either for electromagnetic or piezoelectric harvesting. The harvester is modelled analytically and numerically both with regard to the force-displacement and to the modal response. The experimental validation of the harvester, highlights a noticeable power output but at a higher eigenfrequency than expected.

scholarly journals Trackhold: A Novel Passive Arm-Support Device

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Basilio Lenzo ◽  
Marco Fontana ◽  
Simone Marcheschi ◽  
Fabio Salsedo ◽  
Antonio Frisoli ◽  
...  
Keyword(s):  
Real Time ◽  
Upper Limb ◽  
Experimental Validation ◽  
Physical Rehabilitation ◽  
Design Approach ◽  
Mechanical Motion ◽  
Dynamic Analyses ◽  
Arm Support ◽  
Support Device ◽  
Limb Posture

This article introduces the design and the experimental validation of the Trackhold, a novel mechanical motion-tracker for upper limb physical rehabilitation. The Trackhold is based on a passively balanced mechanism that can approximately relieve the weight of the patient’s arm regardless of the position. The system features a novel kinematic architecture with large workspace and custom developed joint sensors providing accurate real-time measure of the upper limb posture. The design approach of the device, which went through kinetostatic and dynamic analyses, is presented and details on the employed mechatronic solutions are provided. A prototype of the Trackhold has been fabricated and functionally validated.

scholarly journals Experimental Validation of Aluminum Nitride Energy Harvester Model with Power Transfer Circuit

2009 ◽  
Vol 1 (1) ◽  
pp. 1443-1446 ◽  
Author(s):  
S. Matova ◽  
D. Hohlfeld ◽  
R. van Schaijk ◽  
C.J. Welham ◽  
S. Rouvillois
Keyword(s):  
Aluminum Nitride ◽  
Experimental Validation ◽  
Energy Harvester ◽  
Power Transfer

On Improvement of Operation Bandwidth of Duffing-Like Vibration-Based Harvesters Using a Mechanical Motion Rectifier

2017 ◽  
Author(s):  
Wei-Che Tai ◽  
Mingyi Liu ◽  
Yue Yuan ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Duffing Oscillator ◽  
Nonlinear Stiffness ◽  
Method Of Averaging ◽  
Jump Phenomenon ◽  
Mechanical Motion ◽  
Energy Harvesters ◽  
Vibratory Motion ◽  
Electromagnetic Generator

A novel vibration-based energy harvester which consists of a monostable Duffing oscillator connected to an electromagnetic generator with a mechanical motion rectifier (MMR-Duffing) is studied. The mechanical motion rectifier converts the bi-directional vibratory motion from ambient environments into uni-directional rotation to the generator and causes the harvester to periodically switch between a larger- and small-inertia system, resulting in nonlinearity in inertia. By means of the method of averaging, it is analytically shown that the proposed Duffing-MMR harvester outperforms traditional monostable Duffing oscillator energy harvesters in twofold. First of all, it increases the bandwidth of energy harvesting, given identical nonlinear stiffness. Second of all, it mitigates the jump phenomenon due to nonlinear stiffness and thus exploits more potential bandwidth of energy harvesting without inducing any jump phenomenon. Finally, the analytical analyses are verified via numerical simulations of a prototype of the proposed Duffing-MMR harvester.

A Piezoelectric Based Energy Harvester With Dynamic Magnification

2015 ◽  
Author(s):  
Davide Castagnetti
Keyword(s):  
Energy Harvesting ◽  
Fractal Geometry ◽  
Efficient Solution ◽  
Experimental Validation ◽  
Computational Analysis ◽  
Energy Harvester ◽  
Piezoelectric Materials ◽  
Piezoelectric Transducers ◽  
Ambient Vibrations ◽  
Piezoelectric Energy

Energy harvesting from ambient vibrations exploiting piezoelectric materials is an efficient solution for the development of self-sustainable electronic nodes. This work presents a simple and innovative piezoelectric energy harvester, intrinsically including dynamic magnification and inspired by fractal geometry. After an initial design step, computational analysis and experimental validation show a very good frequency response with five eigenfrequencies below 100 Hz. Even if the piezoelectric transducers were put only on a symmetric half of the top surface of the structure, the energy conversion is good for all the eigenfrequencies investigated.

Large stroke tri-stable vibration energy harvester: Modelling and experimental validation

2022 ◽  
Vol 168 ◽  
pp. 108699
Author(s):  
Chaoran Liu ◽  
Baopeng Liao ◽  
Rui Zhao ◽  
Kaiping Yu ◽  
Heow Pueh Lee ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Energy Harvester ◽  
Vibration Energy ◽  
Vibration Energy Harvester

A Novel Road Energy Harvester System Based on Sliding Deceleration Design and Model

2013 ◽  
Vol 805-806 ◽  
pp. 477-481 ◽  
Author(s):  
Zhi Feng Chao ◽  
Zu Tao Zhang
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Road Traffic ◽  
Experimental Results ◽  
Mechanical Motion ◽  
Main Components ◽  
Simulation Condition ◽  
Sliding Plate

Green, safe and efficient road energy harvesting is a challenge for road traffic application. In this paper, we present a novel road energy harvester system based on sliding deceleration design and model for the purposes of energy harvesting involved in road traffic. The main components of the system consist of sliding deceleration mechanism, rack and pinion transmission, mechanical motion rectifier, which are used to generate electricity from the vibration of the sliding plate excited by vehicles passing by. Compared with the conventional road harvester using the speed bump, the proposed road energy harvester system has potential advantages in reducing the dependence on the speed bump, increasing the safety of vehicle when passing by and expanding its application. The final experimental results show the validity of our method under simulation condition.

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