Metastable conditions in a three-wheeled bicycle with variable front wheel spacing

Journal of Applied Science, Engineering, Technology, and Education

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Title Metastable conditions in a three-wheeled bicycle with variable front wheel spacing
Creator Ślęzak, Marcin
Szczepański, Tomasz
Stasiak-Cieślak, Beata
Malawko, Piotr
Dziedziak, Paweł
Subject side stabilization
electric bike
people with disabilities
Description The article concerns the problem of lateral stabilization of a three-wheeled bicycle, in which the mechanism of variable spacing of front wheels was used. Such a vehicle can operate in two modes: with expanded and connected front wheels. The bicycle is intended for people with disabilities. When driving with expanded wheels, lateral stability is ensured, while the connected wheels allow lateral tilting when cornering. Thanks to this, it is possible for a person with lower limb dysfunction to move on a bicycle in a way as close as possible to using a classic two-wheeled bicycle. From a stabilization point of view, the biggest problem occurs when driving with the front wheels connected, because the wheels have a limited minimum distance to make them not touch each other. As a result, there are two points of contact between the front road wheels and the ground. This creates a metastable state, which, with a small lateral angle, causes the bike to return to a vertical position. When the lateral angle of inclination is exceeds the limited value, a side force causes lateral tilt. This phenomenon should be treated as unfavorable, because it disturbs the smooth leaning of the bicycle, which can lead to confusion of the cyclist and difficulties in maintaining balance. This article presents mathematical simulations allowing the analysis of factors affecting the discussed phenomenon. Two measures of metastable state were also introduced. This allowed to propose bicycle construction parameters at which the disadvantages associated with the metastable state will be as small as possible. A prototype of such a bike was also presented, made in accordance with the conclusions of the presented calculations.
Publisher Yayasan Ahmar Cendekia Indonesia
Date 2020-10-06
Type info:eu-repo/semantics/article
Peer-reviewed Article
Source Journal of Applied Science, Engineering, Technology, and Education; Vol. 3 No. 2 (2021): (In Press)
Language en
Rights Copyright (c) 2020 Marcin Ślęzak, Tomasz Szczepański, Beata Stasiak-Cieślak, Piotr Malawko, Paweł Dziedziak (Author)

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