Journal of NeuroEngineering and Rehabilitation

Table 2 Case study for the ankle energy harvesting device [14]

From: Harvesting biomechanical energy or carrying batteries? An evaluation method based on a comparison of metabolic power

				Device mass [kg]
		0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1
Walking time [hours]	40	−2.0	−4.9	−7.7	−10.6	−13.5	−16.4	−19.3	−22.3	−25.3	−28.3
	60	0.5	−2.4	−5.2	−8.1	−11.0	−13.9	−16.8	−19.8	−22.8	−25.8
	80	3.0	0.2	−2.7	−5.6	−8.5	−11.4	−14.3	−17.3	−20.2	−23.2
	100	5.5	2.7	−0.1	−3.0	−5.9	−8.8	−11.8	−14.7	−17.7	−20.7
	120	8.1	5.3	2.4	−0.5	−3.4	−6.3	−9.2	−12.2	−15.1	−18.1
	140	10.7	7.8	5.0	2.1	−0.8	−3.7	−6.6	−9.6	−12.6	−15.6
	160	13.3	10.4	7.6	4.7	1.8	−1.1	−4.0	−7.0	−10.0	−13.0
	180	15.9	13.0	10.2	7.3	4.4	1.5	−1.4	−4.4	−7.4	−10.4
	200	18.5	15.7	12.8	9.9	7.1	4.1	1.2	−1.8	−4.7	−7.7
	220	21.1	18.3	15.5	12.6	9.7	6.8	3.8	0.9	*−2.1*	−5.1
	240	23.8	21.0	18.1	15.3	12.4	9.4	6.5	3.6	0.6	−2.4
	260	26.5	23.7	20.8	17.9	15.0	12.1	9.2	6.2	3.3	0.3

The values in the table are the differences in metabolic power in watts (carrying batteries minus harvesting device scenarios), for given mass and walking times. Positive values indicate that the harvesting device requires less effort than batteries (i.e., energy harvesting is preferred over batteries), negative values (bold) represent combinations were batteries are preferred options. The Italic values refer to the current published device (0.86kg, 220h).

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ISSN: 1743-0003

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