Increased energy harvesting from backpack to serve as self-sustainable power source via a tube-like harvester

Xie, Longhan; Li, Xiao Dong; Cai, Siqi; Huang, Ledeng; Li, Jiehong

doi:10.1016/j.ymssp.2017.04.013

Cited by 25 publications

(16 citation statements)

References 28 publications

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“…After this milestone work, Xie and Cai developed an improved energy harvester that consists of symmetric rack gear systems and generators, which outputs 4.1 W with a carried load of 15 kg at the same walking speed. [ 57 ] Later, to further enhance the power output and reduce the structure complexity, Xie et al explored a tube‐like energy harvester embedded in the backpack to capture the COM motion in multiple directions and achieved a maximum power output of 7 W, [ 58 ] as shown in Figure 6 . Apart from these works, various power enhancement methods have been investigated.…”

Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

“…It can be seen that the power density of these devices ranges from 0.195 to 1.4 W kg −1 . Among these devices, the energy harvesters [ 58,60 ] that are capable of capturing the motion in multiple directions can achieve the highest power densities. Although other devices have demonstrated significant improvement on power density, it seems that capturing the motion in multiple directions renders a promising strategy to enhance the performance.…”

Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

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Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

et al. 2020

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The development of wearable electronics and sensors is constrained by the limited capacity of their batteries. Therefore, energy harvesting from human motion is explored to provide a promising embedded sustainable power supply for wearable devices. Herein, the principles, development, and applications of human motion excited energy harvesters are reviewed. The energy harvesters are classified based on the human motions with distinguished characteristics: center of mass motion (COM), joint motion, foot strike, and limb swing motion. According to the motion characteristics, the principles, features, and limitations of different energy harvesters are discussed, and the power generation performances are compared. Finally, various self-powered applications enabled by embedded energy harvesters are introduced, so as to show the great potential of embedded energy harvesting systems in boosting the development of the wearables.

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Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

et al. 2020

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“…Our goal was to obtain the maximum electricity while minimizing the participant's metabolic consumption. In our previous studies, a light-weight tube-like energy harvester (TL harvester) which was embedded in a backpack [30] and a traditional frequency-tuneable backpack-based energy harvester (FT harvester), which could also relieve accelerative load [17] were proposed. Given that the electromagnetic generators have high energy density and do not need smart materials and external voltage source, compared to the piezoelectric and electrostatic generators [31,32], electromagnetic generators were used to produce electricity in both harvesters.…”

Section: Introductionmentioning

confidence: 99%

Energy Harvesting Backpacks for Human Load Carriage: Modelling and Performance Evaluation

et al. 2020

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In recent years, there has been an increasing demand for portable power sources as people are required to carry more equipment for occupational, military, or recreational purposes. The energy harvesting backpack that moves relative to the human body, could capture kinetic energy from human walking and convert vertical oscillation into the rotational motion of the generators to generate electricity. In our previous work, a light-weight tube-like energy harvester (TL harvester) and a traditional frequency-tuneable backpack-based energy harvester (FT harvester) were proposed. In this paper, we discuss the power generation performance of the two types of energy harvesters and the energy performance of human loaded walking, while carrying energy harvesting backpacks, based on two different spring-mass-damper models. Testing revealed that the electrical power in the experiments showed similar trends to the simulation results, but the calculated electrical power and the net metabolic power were higher than that of the experiments. Moreover, the total cost of harvesting (TCOH), defined as additional metabolic power in watt required to generate 1 W of electrical power, could be negative, which indicated that there is a chance to generate 6.11 W of electricity without increasing the metabolic cost while carrying energy harvesting backpacks.

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“…The advantage of a BMEHs is that they do not require dedicated attention for their operation, like a hand crank generator. A particular subset of BMEHs, called inertial based harvesters, generate electricity from the movement of an external mass [7][8][9][10][11][12][13][14][15][16][17]. This subset of harvesters are particularly advantaged by the aforementioned groups who work in remote areas, as these individuals often carry weight in a backpack for their expedition, ideal for use as a proof mass in an energy harvesting system.…”

Section: Introductionmentioning

confidence: 99%

“…Their device generated up to 7.4 W while carrying 38 kg of weight [7]. Since then, various groups have created energy harvesting backpacks that similarly generate electricity (46 mW-10.6 W) [9,15] from allowing the carried mass to oscillate in the vertical direction [9,[13][14][15][16]. Of the aforementioned devices, none have targeted medial-lateral (M -L) oscillations of carried mass in a backpack.…”

Section: Introductionmentioning

confidence: 99%

Generating electricity while walking with a medial–lateral oscillating load carriage device

Martin

2019

R. Soc. open sci.

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Biomechanical energy harvesters generate electricity, from human movement, to power portable electronics. We developed an energy harvesting module to be used in conjunction with a load carriage device that allows carried mass in a backpack to oscillate in the medial–lateral (M–L) direction. The energy harvesting module was designed to tune M–L oscillations of the carried mass to create favourable device–user interaction. We tested seven energy harvesting conditions and compared them to walking with the device when the weight was rigidly fixed to the backpack frame. For each energy harvesting condition, we changed the external load resistance: altering how much electricity was being generated and how much the carried mass would oscillate. We then correlated device behaviour to the biomechanical response of the user. The energy harvesting load carriage system generated electricity with no significant increase in the metabolic power required to walk, when compared to walking with the carried weight rigidly fixed. The device was able to generate up to 0.22 ± 0.03 W of electricity, while walking with 9 kg of carried weight. The device also reduced the interaction forces experienced by the user, in the M–L direction, compared to walking with the device when the mass was rigidly fixed.

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Increased energy harvesting from backpack to serve as self-sustainable power source via a tube-like harvester

Cited by 25 publications

References 28 publications

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Energy Harvesting Backpacks for Human Load Carriage: Modelling and Performance Evaluation

Generating electricity while walking with a medial–lateral oscillating load carriage device

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