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Sports Engineering - A Monark cycle ergometer is a device globally used in physiological studies to measure the work and energy levels of exercising humans. In this paper a rope-braked cycle... 相似文献
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通过修正材料插值模型和引入应力均方差作为性能收敛指标,改进了基于von Mises应力的双向渐进结构拓扑优化(Bi-directional Evolutionary Structural Optimization, BESO)方法,并结合Abaqus有限元软件及MATLAB语言编程实现了该算法;在此基础上,优化设计了集材绞盘机摩擦卷筒,得到不同材料体积分数、不同旋转周期数时,摩擦卷筒的最优拓扑结构,在减轻质量的同时,降低了应力集中水平。优化结果对实现集材绞盘机摩擦卷筒轻量化设计具有工程指导意义。 相似文献
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游士琴 《淮南职业技术学院学报》2002,2(4):105-107
机械在运转过程中,等效力矩和等效转动惯量的周期性变化将导致速度的周期性波动。这种速度波动可用飞轮来调节,其实质是增加机械的转动惯量。从分析飞轮调节作用的原理入手,总结了飞轮转动惯量的计算方法。 相似文献
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F. Javier Núñez Carlos Galiano Alejandro Muñoz-López Pablo Floria 《Journal of sports sciences》2020,38(14):1624-1628
ABSTRACT The aims of this study were to compare the force profile of using a horizontal cylinder-shaped axis or a vertical cone-shaped axis to provide resistance in rotary inertia devices, and to report the evolution of kinetic and kinematic variables in experienced athletes during a half-squat exercise. Twenty-two healthy active men participated in the assessment of time, peak velocity, peak force, time to reach the peak force, average force, impulse, and range of movement, during a half-squat incremental test performed on conical inertial device (CP) and on cylinder inertial device (YY). The analysis showed that YY during CON-ECC phased generates substantial higher peak_force, mean_force, impulse, time, and a lower peak_velocity, than CP. We never obtained eccentric overload for peak_force or mean_force. CP offers less resistance to accelerate-decelerate the movement with respect to YY, we need checking whether eccentric overload it is being produced, and the impulse was the only kinetic variable that was able to discriminate between the inertias and devices. 相似文献
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飞轮等惯性训练(以下简称"飞轮训练")因其特殊的离心运动和抗阻运动性能而受到教练员和科研人员的重视。通过飞轮训练对运动员和大众人群的损伤和康复等相关研究进行综述,理清了飞轮训练的起源与发展,分析影响其背后的生理机制,进一步探究改善肌肉萎缩、预防损伤和神经康复等方面的研究进展。研究发现,飞轮训练最早用于预防航天员太空失重环境下的肌肉萎缩问题,后来被逐渐运用到竞技体育和康复领域。影响飞轮训练的生理机制包括肌肉过度牵拉产生的牵张反射、神经系统动员的效果和肌腱复合体的效果。飞轮训练在改善肌肉萎缩和老年人生活表现方面具有显著效果,并且在预防运动损伤、提高损伤后的康复和中枢神经系统的适应性方面具有优越性。 相似文献
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张帆 《荆门职业技术学院学报》2008,23(9)
以165系列柴油机飞轮为研究对象,在分析飞轮高频淬火原工艺产生裂纹的主要原因的基础上,提出了几种相应的工艺改进措施,使合格品率得到明显的提高。 相似文献
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