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Access type: UnknownAuthor: search.filters.author.Zhao Daichang

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    Item type:Publication,
    Dynamic stability and vibration responses of a volleyball game ball
    (2025-04-25)
    Zhao Daichang
    ;
    Li Aiyun
    ;
    HABIBI, MOSTAFA  
    ;
    Zhiqiang, Song
    ;
    Albaijan, Ibrahim
    This study investigates the vibrational response of a graphene oxide-reinforced volleyball under impact loading, aiming to enhance its dynamic stability. Employing Hamilton’s principle and spherical shell coordinates, we derive the governing equations for the ball’s motion under internal loading. These equations are solved using the generalized differential quadrature (GDQ) method and analytical techniques to analyze the vibrational modes. The results demonstrate a significant correlation between the ball’s radius and its dynamic stability, with variations in radius substantially affecting vibrational characteristics. Notably, we find that increased ball mass, independent of size, contributes to enhanced stability upon ground impact. This observation suggests that heavier balls exhibit improved resistance to deformation and vibration, leading to more predictable trajectories. The findings provide a quantitative basis for optimizing volleyball design by elucidating the interplay between material reinforcement, geometry, and impact dynamics, thereby facilitating the development of volleyballs with improved stability and performance.
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    Application of a folded nanostructure reinforcement for the pole vault curved shell
    (Informa UK Limited, 2024-07-08)
    Song Zhiqiang
    ;
    Li Aiyun
    ;
    Zhao Daichang
    ;
    Li Shuangjun
    ;
    Mostafa Habibi
    Foldability capacity is now introduced as a novel nanofiller reinforcement production procedure using some operation to control the mechanical, thermal and electrical properties in the sport equipment. Application of this type of nanofillers in the curved structures like pole vault shell leads to a novel engineering and sport shell shape structures. This article is organized to suggest a vibration-based formulation for analysis of folded reinforced curved shell sport structure subjected to thermal and mechanical loading. Using computation of kinetic, strain and external energies, one can arrive the motion’s equations using the minimization of total energy and Hamilton’s principle. Using solution of the motion’s equations through an analytical approach, the parametric analysis is presented. The verified test is presented for confirmation of the solution and trend of results.