Performance evaluation of suspended energy harvesting backpack using half-wave mechanical rectification

Jia Mi, Qiaofeng Li, Mingyi Liu, Xiaofan Li, Lei Zuo*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Human beings are becoming more and more dependent on electronic devices, such as smart phones, smart watches, GPS, etc. This paper presents the design, modeling and testing of a novel suspended energy harvesting backpack using half-wave mechanical rectification. The proposed half-wave rectification mechanism can convert bidirectional linear vibration into unidirectional rotation with nonlinear inertia. Compared with full-wave mechanical rectification, the proposed half-wave rectification is designed only to convert the motion in one of the vibration directions while remaining idle in the other direction. Numerical simulation shows the proposed half-wave rectification based suspended energy harvesting backpack can obtain about two times of the average output power as the previous full-wave rectification design while also maintaining larger output power in the wideband frequency range. Bench test results indicate that the proposed half-wave rectification-based energy harvesting backpack can harvest 6.7 W (peak)/2.1 W (average) under 2 Hz and 6 mm excitation with a 31.8 kg payload, which is a significant improvement compared with 1.9 W(peak)/0.9 W (average) for the counterpart of full-wave rectification system. In addition, bench test results also validate the energy harvesting in wideband frequency range. Treadmill tests demonstrate an average power range of 1.2-11.0 W under walking speeds of 3.2-6.4 km/h with a 13.6 kg payload.

Original languageEnglish
Title of host publicationIntelligent Transportation/Vehicles; Manufacturing; Mechatronics; Engine/After-Treatment Systems; Soft Actuators/Manipulators; Modeling/Validation; Motion/Vibration Control Applications; Multi-Agent/Networked Systems; Path Planning/Motion Control; Renewable/Smart Energy Systems; Security/Privacy of Cyber-Physical Systems; Sensors/Actuators; Tracking Control Systems; Unmanned Ground/Aerial Vehicles; Vehicle Dynamics, Estimation, Control; Vibration/Control Systems; Vibrations
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791884287
StatePublished - 2020
Externally publishedYes
EventASME 2020 Dynamic Systems and Control Conference, DSCC 2020 - Virtual, Online
Duration: 5 Oct 20207 Oct 2020

Publication series

NameASME 2020 Dynamic Systems and Control Conference, DSCC 2020


ConferenceASME 2020 Dynamic Systems and Control Conference, DSCC 2020
CityVirtual, Online


  • Biomechanical energy
  • Energy harvesting
  • Half-wave mechanical rectification
  • Inertia nonlinearity
  • Suspended backpack


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