A study of vibration behavior in shoe sole using vibration level difference and power flow method
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(2020) 42:594
TECHNICAL PAPER
A study of vibration behavior in shoe sole using vibration level difference and power flow method Xiaoying Liu1 · Yong Yue1 · Xuyang Wu1 · Yanhua Hao1 Received: 5 March 2020 / Accepted: 25 September 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract Vibration is a common phenomenon in people’s daily life. As the main bearing part of the human body, the foot can cushion the impact and shock of external force, and alleviate the influence of external vibration on the human body. Footwear with different structures and materials could cause kinematic, kinetic and biomechanical changes in the foot and leg. It is necessary to evaluate the effects of various footwear on the foot. In this paper, a method based on the vibration cushion characteristics of shoes is proposed to discuss the effect of shoes on feet. First of all, the modal test of the common sole was carried out in this paper, and the acceleration vibration level difference of the sole was obtained. Then, based on the finite element method, the power flow method was used to analyze the soles under different gait patterns. Finally, the vibration analysis of the soles filled with different porous structures was carried out by power flow method. The results show that the vibration level difference and power flow method can be used to study the vibration behavior of vibrating body from the aspects of structure and energy accurately and effectively, and the soles filled with triangular and quadrilateral porous structure have better damping performance. This method can be used to further study the biomechanical effect of the sole on foot and as a reference for shoe design. Keywords Vibration behavior · Power flow · Vibration level difference · Energy transfer
1 Introduction Vibration is everywhere, from microseism to the intense explosion, from the underground-induced vibration of the soil layer to the ground traffic caused by vibration to the air vibration of the aircraft flying in the air, all kinds of vibration are affecting people’s life all the time. The body’s sense of vibration is received through the sensory organs, such as the vestibular organ, the peripheral nerve in the epidermis, muscle spindle. When the vibration reaches a certain intensity, the body will experience headaches, dizziness, fatigue, drowsiness, sweating, insomnia, memory loss, and other neurasthenic symptoms [1]. The foot is a natural shock-absorbing structure. It is a very important part of the human body and plays an important role in Technical Editor: Thiago Ritto. * Xiaoying Liu [email protected] 1
College of Mechanical Engineering and Automation, Huaqiao University, 688 Jimei Road, Xiamen, Fujian, China
human evolution. Among them, the longitudinal arch of the human foot is a complex mechanical structure. Under the collaborative effect of the four-layer load-sharing system composed of the plantar fascia, plantar intrinsic muscles, plantar arch extrinsic muscles, and plantar ligaments, the longitudinal arch can be com
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