Yang Ze, Yang Yiyong, Liu Fan, Wang Zhaozheng, Li Yinbo, Qiu Jiahao, Xiao Xuan, Li Zhiwei, Lu Yijia, Ji Linhong, Wang Zhong Lin, Cheng Jia
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China.
ACS Nano. 2021 Feb 23;15(2):2611-2623. doi: 10.1021/acsnano.0c07498. Epub 2021 Feb 3.
Long-distance walking with heavy loads is often needed when going hiking or for field rescue, which is prone to cumulative fatigue. There is also a great need for labor-saving and biomechanical energy harvesting in daily life for extended security and communication needs. Here, we report a load-suspended backpack for harvesting the wasted energy of human motion based on a triboelectric nanogenerator (TENG). Two elastomers are incorporated into the backpack to decouple the synchronous movement of the load and the human body, which results in little or no extra accelerative force. With such a design, through theoretical analysis and field experiments, the backpack can realize a reduction of 28.75 % in the vertical oscillation of the load and 21.08 % in the vertical force on the wearer, respectively. Meanwhile, the mechanical-to-electric energy conversion efficiency is modeled and calculated to be 14.02 % under normal walking conditions. The designed backpack has the merits of labor-saving and shock absorption as well as electricity generation, which has the promising potential to be a power source for small-scale wearable and portable electronics, GPS systems, and other self-powered health care sensors.
徒步旅行或野外救援时，经常需要背负重物进行长途行走，这容易导致累积疲劳。在日常生活中，为满足延长安全和通信需求，对省力及生物机械能收集也有很大需求。在此，我们报告一种基于摩擦纳米发电机（TENG）的用于收集人体运动浪费能量的背负式背包。背包中集成了两种弹性体，以使负载与人体的同步运动解耦，从而产生很少或没有额外的加速力。通过这种设计，经过理论分析和现场实验，该背包可分别使负载的垂直振荡减少28.75%，穿戴者所受垂直力减少21.08%。同时，在正常行走条件下，对机械能到电能的转换效率进行建模计算，结果为14.02%。所设计的背包具有省力、减震以及发电的优点，有望成为小型可穿戴和便携式电子产品、GPS系统及其他自供电医疗保健传感器的电源。
