A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:
Selected papers from the latest issue:
Halbach array linear alternator for thermo-acoustic engine
05 February 2012, 21:52:53
Publication year: 2012
Source: Sensors and Actuators A: Physical, Available online 4 February 2012
C.R. Saha, Paul. H. Riley, J. Paul, Z. Yu, A.J. Jaworski, ...
This paper focuses on the design issues of a thermo-acoustically driven low-cost linear alternator for the SCORE project. SCORE (www.score.uk.com) aims to improve the quality of life around 2 billion poor people in the rural communities of the developing countries. The advantage of the double Halbach array permanent magnet moving coil alternator structure over traditional loudspeaker as a linear alternator is presented. The theoretical analysis of the linear alternator at different coil configurations with the rectifier circuit is explained and analysed with the finite elements simulation results. The simulation results show that the double coil structure with the smaller number of coil turns would be suitable for this project. The experimental results of the double Halbach array prototype which has been built and tested are discussed and compared with the simulation results.
Source: Sensors and Actuators A: Physical, Available online 4 February 2012
C.R. Saha, Paul. H. Riley, J. Paul, Z. Yu, A.J. Jaworski, ...
This paper focuses on the design issues of a thermo-acoustically driven low-cost linear alternator for the SCORE project. SCORE (www.score.uk.com) aims to improve the quality of life around 2 billion poor people in the rural communities of the developing countries. The advantage of the double Halbach array permanent magnet moving coil alternator structure over traditional loudspeaker as a linear alternator is presented. The theoretical analysis of the linear alternator at different coil configurations with the rectifier circuit is explained and analysed with the finite elements simulation results. The simulation results show that the double coil structure with the smaller number of coil turns would be suitable for this project. The experimental results of the double Halbach array prototype which has been built and tested are discussed and compared with the simulation results.
Highlights
► This paper focuses on the design issues of a thermo-acoustically driven low-cost (£4 for 150 W) linear alternator to generate electricity from cooking stove for SCORE (www.score.uk.com) project. ► Describe the theoretical issues of the alternator coil design to understand the fundamental concepts of voltage and efficiency when used with a battery rectifier circuit. ► Simulation and experimental result of the double Halbach array alternator is presented and discussed how the Halbach array alternator will meet the cost target of the SCORE project.Wide-Bandwidth, Meandering Vibration Energy Harvester With Distributed Circuit Board Inertial Mass
05 February 2012, 21:52:53
Publication year: 2012
Source: Sensors and Actuators A: Physical, Available online 4 February 2012
D.F. Berdy, B. Jung, J.F. Rhoads, D. Peroulis
A wide-bandwidth, meandering piezoelectric vibration energy harvester is presented for the first time utilizing the sensor node electronics as a distributed inertial mass. The energy harvester achieves an experimental maximum power output of 198 μW when excited with a peak acceleration of 0.2 g (where 1 g is 9.8 m/s) at 35 Hz. The output power remains higher than half of the maximum power (99 μW) for the frequency band from 34.4 Hz to 42 Hz, achieving a half power fractional bandwidth of 19.9%, an increase of 4× compared to typical single-mode energy harvesters. The output power remains above 20 μW from 29.5 to 48 Hz, achieving a 20-μW fractional bandwidth of 48%. This is the highest reported fractional bandwidth for this low 0.2 g acceleration level. The distributed inertial mass in combination with the meandering harvester's close natural frequency spacing is what enables the wide bandwidth. The energy harvester is demonstrated to autonomously operate a sensor node to sense and transmit temperature through a 434 MHz on-off-keying wireless transmitter while the electronics are used as the inertial distributed mass.
Source: Sensors and Actuators A: Physical, Available online 4 February 2012
D.F. Berdy, B. Jung, J.F. Rhoads, D. Peroulis
A wide-bandwidth, meandering piezoelectric vibration energy harvester is presented for the first time utilizing the sensor node electronics as a distributed inertial mass. The energy harvester achieves an experimental maximum power output of 198 μW when excited with a peak acceleration of 0.2 g (where 1 g is 9.8 m/s) at 35 Hz. The output power remains higher than half of the maximum power (99 μW) for the frequency band from 34.4 Hz to 42 Hz, achieving a half power fractional bandwidth of 19.9%, an increase of 4× compared to typical single-mode energy harvesters. The output power remains above 20 μW from 29.5 to 48 Hz, achieving a 20-μW fractional bandwidth of 48%. This is the highest reported fractional bandwidth for this low 0.2 g acceleration level. The distributed inertial mass in combination with the meandering harvester's close natural frequency spacing is what enables the wide bandwidth. The energy harvester is demonstrated to autonomously operate a sensor node to sense and transmit temperature through a 434 MHz on-off-keying wireless transmitter while the electronics are used as the inertial distributed mass.
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