Energy performance analysis of a suspended backpack with an optimally controlled variable damper for human load carriage

Yang，Lianxin1; Zhang，Jiwen1; Xu，Yuning1; Chen，Ken1; Fu，Chenglong2

2020-04-01

10.1016/j.mechmachtheory.2019.103738

MECHANISM AND MACHINE THEORY   影响因子和分区

0094-114X

This paper investigates the energy performance of human load carriage with a variable damped suspended backpack. A vertical double-mass coupled-oscillator model is adopted to predict the load movement and energy consumption. Optimal control is found to be bang-bang, switching four times between the minimum and the maximum damping in a step cycle. With analytically tested laws for optimal switching timing, an orbitally stable event-based control strategy with feedback is designed. Simulation results reveal that the suspended backpack with an optimally controlled variable damper improves the energy efficiency of load carriage and reduces the load force exerting on carriers for a wide range of suspension stiffness and walking conditions, representing less energy expenditure, better comfort and stronger adaptability over the passive elastic backpacks with constant suspension parameters. The working principle of the variable damper is also analyzed. Although this paper only deals with the theoretical model and analysis of the problem, the discussion on validity implies a considerable improvement in energy performance, including efficiency and adaptability.

Energetic cost Human walking Load carriage Optimal control Semi-active suspension

SCI ; EI

英语

通讯

[2018YFB1305400] ; [SGLH20180619172011638] ; National Natural Science Foundation of China[U1913205] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06G587]

Engineering

Engineering, Mechanical

WOS:000509752800023

Elsevier Ltd

20195307949961

Energy efficiency ; Energy utilization ; Loads (forces) ; Oscillators (mechanical)

Structural Design:408 ; Energy Conservation:525.2 ; Energy Utilization:525.3 ; Mechanical Devices:601.1 ; Machine Components:601.2

ENGINEERING

2-s2.0-85077072090

Scopus

1.Department of Mechanical Engineering,Tsinghua University,Beijing,100084,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Yang，Lianxin,Zhang，Jiwen,Xu，Yuning,et al. Energy performance analysis of a suspended backpack with an optimally controlled variable damper for human load carriage[J]. MECHANISM AND MACHINE THEORY,2020,146.

Yang，Lianxin,Zhang，Jiwen,Xu，Yuning,Chen，Ken,&Fu，Chenglong.(2020).Energy performance analysis of a suspended backpack with an optimally controlled variable damper for human load carriage.MECHANISM AND MACHINE THEORY,146.

Yang，Lianxin,et al."Energy performance analysis of a suspended backpack with an optimally controlled variable damper for human load carriage".MECHANISM AND MACHINE THEORY 146(2020).