An investigation has been carried out into how much energy can be harvested from the vibration of a passing train, using a mechanical oscillator. Using the measured acceleration time-history of a track due to a specific train at a particular speed, the total energy harvested for the passage of a train has been calculated for a range of devices with different natural frequencies. The stiffness, and hence the tuning frequency of the device, was varied in simulations to determine the optimum frequency at which to tune the device for a fixed value of mass and damping in the device. So that the amplitude of the oscillation does not exceed the physical limit of the device a constraint was put on the relative displacement. With this constraint, it was found that the greatest energy was harvested at a frequency of 16.6 Hz even though this was not the dominant frequency in the velocity spectrum. However, a slight change in the tuning frequency of the harvester at 16.6 Hz, may result in the harvested power being much less. In the limited investigation carried out in this paper it has been found that in ideal conditions a single device can harvest a maximum of about 0.15 J/kg.
Energy harvesting from train vibrations
2013
9 Seiten, 8 Bilder, 22 Quellen
Conference paper
Storage medium
English
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