Energy-harvesting power sources for gun-fired munitions

2011 ◽  
Author(s):  
J. Rastegar ◽  
R. Murray ◽  
C. Pereira ◽  
H.-L. Nguyen
Keyword(s):  
Energy Harvesting ◽  
Power Sources

scholarly journals Effects of the Angled Blades of Extremely Small Wind Turbines on Energy Harvesting Performance

Mathematics ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1295 ◽  
Author(s):  
Junseon Park ◽  
Seungjin Lee ◽  
Joong Yull Park
Keyword(s):  
Energy Harvesting ◽  
Wind Turbines ◽  
Load Resistance ◽  
Power Sources ◽  
Low Intensity ◽  
Basic Model ◽  
Computational Fluid Dynamics Analysis ◽  
Small Wind Turbines ◽  
Useful Power ◽  
Blade Geometry

Low-intensity winds can be useful power sources in the context of energy harvesting. This study aims to enhance the power generation capacity of a super micro wind turbine (SMWT) in low-intensity winds by modifying the blade geometry, which cannot be realized in conventional wind turbines owing to the stress concentration. By controlling the curved angle (θ) in the middle of the blade, the rotor performance can be improved, and the rotor diameter can be reduced to increase installation density. Experimental results indicated that the optimal θ value was 105°, at which the AC voltage was improved by 7.4% compared to that in the case of the basic model with θ = 0°. The maximum electric power output was 9.333 μW and the load resistance was 47.62 kΩ. Moreover, a computational fluid dynamics analysis was performed to clarify the pressure field and streamlines on and around the blade to demonstrate the aerodynamic performance of the SMWT. The proposed blade geometry is one of many possible designs that can enhance extremely small wind turbines for energy harvesting.

scholarly journals Hollow Piezoelectric Ceramic Fibers for Energy Harvesting Fabrics

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800
Author(s):  
François M. Guillot ◽  
Haskell W. Beckham ◽  
Johannes Leisen
Keyword(s):  
Energy Harvesting ◽  
Lead Zirconate Titanate ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Electrical Energy ◽  
Lead Zirconate ◽  
Ceramic Fibers ◽  
Power Sources ◽  
Electromechanical Performance ◽  
Alternative Power

In the past few years, the growing need for alternative power sources has generated considerable interest in the field of energy harvesting. A particularly exciting possibility within that field is the development of fabrics capable of harnessing mechanical energy and delivering electrical power to sensors and wearable devices. This study presents an evaluation of the electromechanical performance of hollow lead zirconate titanate (PZT) fibers as the basis for the construction of such fabrics. The fibers feature individual polymer claddings surrounding electrodes directly deposited onto both inside and outside ceramic surfaces. This configuration optimizes the amount of electrical energy available by placing the electrodes in direct contact with the surface of the material and by maximizing the active piezoelectric volume. Hollow fibers were electroded, encapsulated in a polymer cladding, poled and characterized in terms of their electromechanical properties. They were then glued to a vibrating cantilever beam equipped with a strain gauge, and their energy harvesting performance was measured. It was found that the fibers generated twice as much energy density as commercial state-of-the-art flexible composite sensors. Finally, the influence of the polymer cladding on the strain transmission to the fiber was evaluated. These fibers have the potential to be woven into fabrics that could harvest mechanical energy from the environment and could eventually be integrated into clothing.

Functional Materials for Wearable Sensing, Actuating and Energy Harvesting

2008 ◽  
Vol 57 ◽  
pp. 247-256 ◽  
Author(s):  
Danilo De Rossi ◽  
Federico Carpi ◽  
Fabia Galantini
Keyword(s):  
Energy Harvesting ◽  
Functional Materials ◽  
Wearable Devices ◽  
Electroactive Polymer ◽  
Electronic Textiles ◽  
Research Groups ◽  
Power Sources ◽  
Wearable Sensing ◽  
Potential Applicability ◽  
Biomedical Field

This paper describes the early conception and latest developments of electroactive polymer (EAP)- based sensors, actuators and power sources, implemented as wearable devices for smart electronic textiles (e-textiles). Such textiles, functioning as multifunctional wearable human interfaces, are today considered relevant promoters of progress and useful tools in several biomedical field, such as biomonitoring, rehabilitation and telemedicine. This paper presents the more performing EAPbased devices developed by our lab and other research groups for sensing, actuating and energy harvesting, with reference to their already demonstrated or potential applicability to electronic textiles.

scholarly journals A highly shape-adaptive, stretchable design based on conductive liquid for energy harvesting and self-powered biomechanical monitoring

2016 ◽  
Vol 2 (6) ◽  
pp. e1501624 ◽  
Author(s):  
Fang Yi ◽  
Xiaofeng Wang ◽  
Simiao Niu ◽  
Shengming Li ◽  
Yajiang Yin ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Three Dimensional ◽  
Power Source ◽  
Triboelectric Nanogenerator ◽  
Stretchable Electronics ◽  
Large Area ◽  
Conductive Liquid ◽  
Power Sources ◽  
Energy Harvesters ◽  
Self Powered

The rapid growth of deformable and stretchable electronics calls for a deformable and stretchable power source. We report a scalable approach for energy harvesters and self-powered sensors that can be highly deformable and stretchable. With conductive liquid contained in a polymer cover, a shape-adaptive triboelectric nanogenerator (saTENG) unit can effectively harvest energy in various working modes. The saTENG can maintain its performance under a strain of as large as 300%. The saTENG is so flexible that it can be conformed to any three-dimensional and curvilinear surface. We demonstrate applications of the saTENG as a wearable power source and self-powered sensor to monitor biomechanical motion. A bracelet-like saTENG worn on the wrist can light up more than 80 light-emitting diodes. Owing to the highly scalable manufacturing process, the saTENG can be easily applied for large-area energy harvesting. In addition, the saTENG can be extended to extract energy from mechanical motion using flowing water as the electrode. This approach provides a new prospect for deformable and stretchable power sources, as well as self-powered sensors, and has potential applications in various areas such as robotics, biomechanics, physiology, kinesiology, and entertainment.

The Effect of Nonlinear Piezoelectric Coupling on Vibration-Based Energy Harvesting

2008 ◽  
Author(s):  
Angela Triplett ◽  
D. Dane Quinn
Keyword(s):  
Energy Harvesting ◽  
Electrical Power ◽  
Original System ◽  
Constitutive Relationship ◽  
Ambient Vibration ◽  
Attractive Alternative ◽  
Maximum Output ◽  
Power Sources ◽  
Mechanical Coupling

Advances in electronic and consumer technology are increasing the need for smaller, more efficient energy sources. Thus vibration-based energy harvesting, the scavenging of energy from existing ambient vibration sources and its conversion to useful electrical power, is becoming an increasingly attractive alternative to traditional power sources such as batteries. Energy harvesting devices have been developed based on a number of electro-mechanical coupling mechanisms and their design must be optimized to produce the maximum output for given environmental conditions. While the role of nonlinearities in the components has been shown to be significant in terms of the overall device efficiency, few studies have systematically investigated their influence on the system performance. In this work the role of a nonlinear piezoelectric relationship is considered on the performance of a vibration-based energy harvester. Using a Poincare´-Lindstedt perturbation analysis the response of the harvesting system is approximated, including mechanical damping, stiffness nonlinearities, and the above mentioned nonlinear piezoelectric constitutive relationship. The predicted behavior is then compared against numerical simulations of the original system, focusing on the relationship between the power generated by the device, the ambient vibration characteristics, and the nonlinearities in the system.

A Low-order Model for the Design of Piezoelectric Energy Harvesting Devices

2008 ◽  
Vol 20 (5) ◽  
pp. 495-504 ◽  
Author(s):  
Jeffrey L. Kauffman ◽  
George A. Lesieutre
Keyword(s):  
Energy Harvesting ◽  
Design Tool ◽  
Mode Shapes ◽  
Piezoelectric Energy Harvesting ◽  
Coupling Coefficients ◽  
Order Model ◽  
Power Sources ◽  
Piezoelectric Energy ◽  
Energy Harvesting Devices ◽  
Low Order

Piezoelectric energy harvesting devices are an attractive approach to providing remote wireless power sources. They operate by converting available vibration energy and storing it as electrical energy. Currently, most devices rely on mechanical excitation near their resonance frequency, so a low-order model which computes a few indicators of device performance is a critical design tool. Such a model, based on the assumed modes method, develops equations of motion to provide rapid computations of key device parameters, such as the natural frequencies, mode shapes, and electro-mechanical coupling coefficients. The model is validated with a comparison of its predictions and experimental data.

scholarly journals ENERGY HARVESTING TECHNIQUES IN WIRELESS SENSOR NETWORKS

2018 ◽  
Vol 17 (2) ◽  
pp. 117
Author(s):  
Tatjana Nikolić ◽  
Mile Stojčev ◽  
Goran Nikolić ◽  
Goran Jovanović
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Energy Harvesting ◽  
Electrical Power ◽  
Electrical Energy ◽  
Wireless Sensor ◽  
Design Solution ◽  
Basic Operation ◽  
Alternative Source ◽  
Power Sources

Batteries are the main source of energy for low-power electronics such as micro-electro mechanical systems (MEMS), wireless sensor networks, embedded devices for remote sensing and control, etc. With the limited capacity of finite power sources and the need for supplying energy for the lifetime of a system/device there is a requirement for self-powered devices. Using conventional batteries is not always good design solution because batteries require human intervention to replace them (very often in hard-accessible and harsh-environmental conditions). Therefore, acquiring the electrical power, by using an alternative source of energy that is needed to operate these devices is a major concern. The process of extracting energy from the surrounding environment and converting it into consumable electrical energy is known as energy harvesting or power scavenging. The energy harvesting sources can be used to increase the lifetime and capability of the devices by either replacing or augmenting the battery usage. There are various forms of energy that can be scavenged, like solar, mechanical, thermal, and electromagnetic. Nowadays, there is a big interest in the field of research related to energy harvesting. This paper represents a survey for identifying the sources of energy harvesting and describes the basic operation of principles of the most common energy harvester. As first, we present, in short, the conversion principles of single energy source harvesting systems and point to their benefits and limitations in their usage. After that, hybrid structures of energy harvesters which simultaneously combine scavenged power from different ambient sources (solar, thermoelectric, electromagnetic), with aim to support higher load at the output, are considered.

scholarly journals Acoustic Energy Harvesting Through Multilayer Piezoelectric Harvester Model

2020 ◽  
Vol 9 (3) ◽  
pp. 1848-1856
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Mechanical Energy ◽  
Scaling Analysis ◽  
Ambient Vibrations ◽  
Specific Element ◽  
Power Sources ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
Effective Transfer

Low-power requirements of contemporary sensing technology attract research on alternate power sources that can replace batteries. Energy harvesters’ function as power sources for sensors and other low-power devices by transducing the ambient energy into usable electrical form. Energy harvesters absorbing the ambient vibrations that have potential to deliver uninterrupted power to sensing nodes installed in remote and vibration rich environments motivate the research in vibrational energy harvesting. Piezoelectric bimorphs have been demonstrating a pre-eminence in converting the mechanical energy in ambient vibrations into electrical energy. Improving the performance of these harvesters is pivotal, as the energy in ambient vibrations is innately low. In this paper, we propose a mechanism namely MultilayerPEHM (Piezoelectric Energy Harvester Model) which helps in converting the waste or unused energy into the useful energy. Multilayer-PEHM contains the various layer, which is placed one over the other, each layer is placed with specific element according to their properties and size, the size of the layer plays an important part for achieving efficiency. Furthermore, this paper presents an audit of the energy available in a vibrating source and design for effective transfer of the energy to harvesters, secondly, design of vibration energy harvesters with a focus to enhance their performance, and lastly, identification of key performance metrics influencing conversion efficiencies and scaling analysis for these acoustic harvesters. Typical vibration levels in stationary installations such as surfaces of blowers and ducts, and in mobile platforms such as light and heavy transport vehicles, are determined by measuring the acceleration signal. The frequency content in the signal is determined from the Fast Fourier Transform.

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