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The energy-saving advantages of burst-and-glide mode for thunniform swimming 被引量:3
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作者 Dan Xia Wei-shan Chen +1 位作者 Jun-kao Liu Xiang Luo 《Journal of Hydrodynamics》 SCIE EI CSCD 2018年第6期1072-1082,共11页
This paper explores the energy-saving advantages of the burst-and-glide swimming and compares it with the normal self-swimming for a thunniform swimmer. The virtual swimmer allows us to perform controlled numerical ex... This paper explores the energy-saving advantages of the burst-and-glide swimming and compares it with the normal self-swimming for a thunniform swimmer. The virtual swimmer allows us to perform controlled numerical experiments by varying the swinging tail number and the duty cycle while keeping the other parameters fixed. 3-D Navier-Stokes equations are used to compute the viscous flow over the swimmer. The user-defined functions and the dynamic mesh technology are used to simulate the burst-and-glide swimming. The results show that with the increase of the swinging tail number or the duty cycle, the swimming velocity, the power and the efficiency all increase, but the velocity-power ratio decreases somewhat. Therefore, choosing smaller swinging tail number and duty cycle is beneficial in reducing the power and increasing the velocity-power ratio, and thus to obtain the same velocity, less power is consumed. And to swim the same distance, the energy can significantly be saved. The power consumption, the efficiency and the velocity-power ratio in the burst-and-glide case are 43.9%, 40.6% and 1.15 times of those in the normal swimming case, respectively. The flow structures clearly show the evolution process around the fish in the burst-and-glide swimming. The findings can be used to reasonably plan the swimming action and to take the advantage of the external flow field energy for the fishlike robot, to be more efficient and energy-saving. 展开更多
关键词 energy-saving advantages burst-and-glide mode normal self-swimming thunniform swimmer
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与中央制动器制成一体的汽车滑行节能装置研究 被引量:3
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作者 孙志春 汪爱丽 +1 位作者 周志立 李言 《拖拉机与农用运输车》 北大核心 2008年第3期85-86,共2页
研制了一种与驻车制动器制成一体的滑行节能装置,并进行了实车试验,结果表明,该自动滑行器既能使汽车在高速时自动滑行省油,又能在低速时利用发动机的制动牵阻作用保障汽车的安全性能。
关键词 滑行节能 单向自动离合器 离心离合器 制动牵阻
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