A model to predict ground reaction force for elastically-suspended backpacks

Leng，Yuquan1; Lin，Xin1; Lu，Zeyu1; Song，Aiguo2; Yu，Zhangguo3; Fu，Chenglong1

2020-10-01

10.1016/j.gaitpost.2020.08.131

GAIT & POSTURE   影响因子和分区

0966-6362

1879-2219

Background: Leg muscle fatigue is the most important factor that affects walking endurance. Considering the legs act as actuators in alternate contact with the ground during walking, the ground reaction force (GRF) of each leg can indirectly reflect the strength of leg muscles. However, it is not clear how the elastically-suspended backpack (ESB) affects GRF of each leg during human level walking. Research question: How is ESB related in GRF of each leg during walking, and how do multiple variables (stiffness and damping of ESB, load mass, walking speed) affect GRF? Methods: An extended bipedal walking model (EBW) with a spring-mass-damping system was proposed to predict the GRF of each leg. In order to evaluate the prediction effect of the model, seven healthy subjects were recruited to attend the experiments using our backpack prototype and the GRFs data was compared. Each subject walked under 12 conditions (load states: locked or unlocked, walking speed: 3.6 km/h, 4.0 km/h, 4.5 km/h, 5.0 km/h, 5.5 km/h, 6.0 km/h). Results: Results showed that the model could quantitatively predict experimental GRFs over the whole gait cycle (R≥0.9628) and the characteristic forces (two peak forces and one trough force) were close to the experimental data (average predicted accuracy 93.7%). The model can reflect relationships between variables and GRF. The relationships showed that an apparent tradeoff exists among the three characteristic forces, and the ESB can produce positive or negative effect under different variables. Significance: This work could help us understand the experimental GRF phenomena, especially the contradictory experimental phenomenon caused by the different parameters. It could also help designers optimize structural parameters of ESB for excellent effects on human. The ESBs with excellent performance can be wildly used in military and tourism.

bipedal walking elastically-suspended backpack Ground reaction force muscle fatigue spring-mass-damping system

SCI

英语

第一 ; 通讯

National Natural Science Foundation of China[51805237][U1913205][U1613206][61533004] ; National Key R&D Program of China[2018YFB1305400] ; Science & Technology Department of Liaoning Province[2020-KF-22-03] ; State Key Laboratory of Robotics, China[2020-KF-22-03] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06G587] ; Shenzhen and Hong Kong Innovation Circle Project[SGLH20180619172011638]

Neurosciences & Neurology ; Orthopedics ; Sport Sciences

Neurosciences ; Orthopedics ; Sport Sciences

WOS:000595604900021

ELSEVIER IRELAND LTD

2-s2.0-85090914623

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.State Key Lab Bioelect,Southeast University,Nanjing,210096,China
3.Intelligent Robotics Institute,Beijing Institute of Technology,Beijing,100081,China

Leng，Yuquan,Lin，Xin,Lu，Zeyu,et al. A model to predict ground reaction force for elastically-suspended backpacks[J]. GAIT & POSTURE,2020,82:118-125.

Leng，Yuquan,Lin，Xin,Lu，Zeyu,Song，Aiguo,Yu，Zhangguo,&Fu，Chenglong.(2020).A model to predict ground reaction force for elastically-suspended backpacks.GAIT & POSTURE,82,118-125.

Leng，Yuquan,et al."A model to predict ground reaction force for elastically-suspended backpacks".GAIT & POSTURE 82(2020):118-125.