Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Biomechanical energy harvesting from human motion: theory, state of the art, design guidelines, and future directions | Riemer and Shapiro Journal of NeuroEngineering and Rehabilitation 2011 8 22 http content 8 1 22 Iril JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access Biomechanical energy harvesting from human motion theory state of the art design guidelines and future directions Raziel Riemer1 and Amir Shapiro2 Abstract Background Biomechanical energy harvesting from human motion presents a promising clean alternative to electrical power supplied by batteries for portable electronic devices and for computerized and motorized prosthetics. We present the theory of energy harvesting from the human body and describe the amount of energy that can be harvested from body heat and from motions of various parts of the body during walking such as heel strike ankle knee hip shoulder and elbow joint motion and center of mass vertical motion. Methods We evaluated major motions performed during walking and identified the amount of work the body expends and the portion of recoverable energy. During walking there are phases of the motion at the joints where muscles act as brakes and energy is lost to the surroundings. During those phases of motion the required braking force or torque can be replaced by an electrical generator allowing energy to be harvested at the cost of only minimal additional effort. The amount of energy that can be harvested was estimated experimentally and from literature data. Recommendations for future directions are made on the basis of our results in combination with a review of state-of-the-art biomechanical energy harvesting devices and energy conversion methods. Results For a device that uses center of mass motion the maximum amount of energy that can be harvested is approximately 1 W per kilogram of device weight. For a person weighing 80 kg and walking at approximately 4 km h the power generation from the heel strike is approximately 2 W. For a joint-mounted device based on generative braking the joints generating the .
