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| 引用本文： | 魏德敏,张衡. ?????????????????????????????о?[J]. 力学与实践, 2008, 30(3): 63-66. DOI: 10.6052/1000-0992-2007-548 |
| 作者姓名： | 魏德敏 张衡 |
| 作者单位： | 华南理工大学亚热带建筑科学国家重点实验室，广东广州 510640 |
| 摘 要： | 从静力平衡条件出发，研究撑杆跳高过程中撑杆的截面尺寸变化对应变能的影响，给出了撑杆壁厚沿长度方向的变化规律. 利用有限单元法计算了极限变形状态下撑杆的变形曲线，验证了极限状态变形曲线为圆弧的假定. 根据能量守恒，引入肌肉收缩做功对跳高高度的贡献，修正了技能指标，得到了考虑运动员体重、身高及握杆高度等影响因素的跳高高度计算公式. |
| 关 键 词： | 撑杆跳高 截面尺寸 应变能 技能指标 握杆高度 |
| 收稿时间： | 2007-11-30 |
| 修稿时间： | 2007-11-30 |
INVESTIGATION ON THE MECHANICAL CHARACTERISTICS OF VAULTING POLE AND THE EFFECT OF THE HEIGHT ON POLE VAULT |
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| WEI Demin,ZHANG Heng. INVESTIGATION ON THE MECHANICAL CHARACTERISTICS OF VAULTING POLE AND THE EFFECT OF THE HEIGHT ON POLE VAULT[J]. Mechanics and Engineering, 2008, 30(3): 63-66. DOI: 10.6052/1000-0992-2007-548 | |
| Authors: | WEI Demin ZHANG Heng |
| Abstract: | In this paper, the effect of the section size on thestrain energy of vaulting poles is investigated in the staticequilibrium condition. The variation of the wall thickness of the vaultingpole along its length is obtained. The deformation curve of the vaulting poleunder the ultimate state is computed by Finite Element Method, and theassumption that the ultimate deformation curve is in a form of arc is verified aswell. The performance index is modified based on the energy conservation,taking into account the contribution of the vaulter's muscle work to the height of polevaulting. The computational formula of thevaulting height is derived as a function of the weight, the height ofathletes and the pole grasp height. |
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