链传动在比赛双人自行车中的功率损失

IF 1.5 Q3 SPORT SCIENCES
Albert Smit, Stephan van der Zwaard, Ina Janssen, Thomas W. J. Janssen
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引用次数: 0

摘要

双人自行车是残奥会的一项比赛项目,由两名选手在一辆双人自行车上进行比赛。它们的性能可以通过最小化功率损耗来提高。本研究旨在量化串联式自行车链传动的功率损失,以及功率输入、功率输入位置和后链轮尺寸的影响。功率损失由曲柄(前轮或后轮)输入功率与后轮输出功率之间的差异决定。功率输出值设置为100 - 400w,增量为50w,使用53-11和53-13两种传动比。动力输入产生于后曲柄(只有主链——自行车——连接主链和次链)和前曲柄(连接主链和次链)。单人自行车的功率损耗为2.1%(±1.5%)。后排双人组的功率损耗明显更大(3.7±2.4%,p <0.001)和前位(3.0±1.8%,p <0.001),在较高的功率输出下,位置之间的差异很小。齿轮53-13的功率损耗(2.9%±1.7%)低于53-11(4.0±2.8%),p <0.001,效应大小为中等)。因此,研究结果表明,由于链传动,前后车手经历了相似的功率损失,但比独自骑自行车更多。双人骑自行车的人可以通过选择较大的传动比来减少他们在链传动中的功率损失。教练在选择和指导他们的双人自行车手时可以考虑这些发现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Power loss of the chain drive in a race tandem bicycle
Abstract Tandem cycling is a paralympic discipline, in which two cyclists ride on one tandem bicycle. Their performance can be improved by minimizing power losses. This study aimed to quantify power loss due to the chain drive of a tandem bicycle and influence of power input, location of power input, and rear chain wheel size. Power loss was determined by the difference between power input applied on the cranks (front or back rider) and power output measured at the rear wheel. Power output values were set from 100 to 400 W, with 50 W increments, and using two gear ratios, 53-11 and 53-13. Power input was generated at the back crank (with only the primary chain—solo bicycle—and with primary and secondary chain attached) and at the front crank (with primary and secondary chain attached). The power loss for the solo bicycle was 2.1% (± 1.5%). A significantly larger power loss was found for the tandem in the back (3.7 ± 2.4%, p < 0.001) and front positions (3.0 ± 1.8%, p < 0.001), with marginal differences between positions at higher power output. Power loss for the tandem was lower with gear 53-13 (2.9% ± 1.7%) compared to 53-11 (4.0 ± 2.8%, p < 0.001, effect size is medium). Therefore, findings suggest that back and front riders experience similar power losses due to the chain drive, but more than on a solo bicycle. Tandem cyclists can reduce their power loss in the chain drive by selecting larger gear ratios. Coaches may consider these findings for selecting and coaching their tandem cyclists.
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来源期刊
Sports Engineering
Sports Engineering SPORT SCIENCES-
CiteScore
2.40
自引率
17.60%
发文量
23
期刊介绍: Sports Engineering is an international journal publishing original papers on the application of engineering and science to sport. The journal intends to fill the niche area which lies between classical engineering and sports science and aims to bridge the gap between the analysis of the equipment and of the athlete. Areas of interest include the mechanics and dynamics of sport, the analysis of movement, instrumentation, equipment design, surface interaction, materials and modelling. These topics may be applied to technology in almost any sport. The journal will be of particular interest to Engineering, Physics, Mathematics and Sports Science Departments and will act as a forum where research, industry and the sports sector can exchange knowledge and innovative ideas.
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