Abstract
As one of the media of the ground and feet, the design of footwear products has lately received great attention, and the cushioning performance of the sole has become a key factor for the comfort and sportiness of the foot. In this paper, a new type of middle sole sports shoes with an alternating gradient lattice structure was proposed. The dynamic response of the structure was analyzed by ABAQUS software, and the model was validated by modal analysis. The effects of different kinds of alternating lattice and uniform lattice sole models on vibration isolation were analyzed by using the vibration level difference as the evaluation index of vibration characteristics. The analysis results are as follows: (a) We found that the mean of the vibration level difference of the alternating gradient structure is higher than that of the uniform lattice structure, which confirms the feasibility of the alternating gradient arrangement and its excellent buffering performance. (b) Two kinds of vibration stage drop values of the 24-series alternating lattice structure model are analyzed, and “C-G-X″ structure has the highest vibration stage drop value. In addition, the comprehensive analysis of the alternating gradient lattice structure of the soles shows that the four types of structures have good cushioning performance, and the C-series structure in the frequency range of 0–140 Hz vibration level difference value is higher than other series. The results show that the evaluation index of vibration level difference based on mechanical vibration characteristics can accurately analyze the response of different structure soles to vibration, which also provides a method for the future design of vibration reduction and exploration of the biomechanics of footwear.
Highlights
IntroductionE material and structure of the sole are important factors affecting the vibration isolation performance of athletic shoes
For the characterization of foot and shoe vibration research and analysis, and combined with the fact that multiple types of the alternating lattice structure of lightweight design-related papers are few, in this study, multiple types of the alternating lattice structure of the sole are proposed to reduce the vibration energy transfer in the structure, and the vibration level drop is proposed as the evaluation index of the vibration characteristics of the sole, which directly reflects the cushioning performance of the heel area
Due to the fact that the load direction applied by the model in this paper is vertical to the ground, the vibration isolation effect of the model is mainly reflected in the z-axis direction, while the acceleration changes in the x-axis and y-axis directions are small, which has little influence on the final research results in this paper which can be ignored. rough finite element analysis, the response data of the selected nodes were obtained
Summary
E material and structure of the sole are important factors affecting the vibration isolation performance of athletic shoes. Special materials with excellent damping properties are used in the middle soles of shoes, for example, heated compressed EVA sealed microcellular foam materials, high-density PU foaming materials, PVC materials, or materials made from a combination of these. Gross and Bunch [3] evaluated the impact load capacity of the midsole of athletic shoes made of three materials through special sensors, and the results showed that there were significant differences in pressure and cushioning capacity in different areas of the sole. E results showed that the peak plantar pressure increased significantly after 500 km, and structural damage appeared in EVA foam after 750 km In the endurance test of materials, Verdejo et al [4] used the finite element method to analyze the pressure distribution and fatigue of the insole of running shoes made of EVA foam. e results showed that the peak plantar pressure increased significantly after 500 km, and structural damage appeared in EVA foam after 750 km
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