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Design of mechanism for optimal bicyclingPourmanoochehri, Souran. January 1983 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1983. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 61-62).
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Electric two-wheelers in China : analysis of environmental, safety, and mobility impacts /Cherry, Christopher R. January 1900 (has links) (PDF)
Thesis (Ph. D. in Civil and Environmental Engineering)--University of California, Berkeley, 2007. / "Spring 2007." Includes bibliographical references (p. 173-179). Also available online via the ITS Berkeley web site (www.its.berkeley.edu).
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Kinetic and vibration analysis of off-road bicycle suspension systemsLevy, Morris 08 May 2000 (has links)
The aim of the present project was to quantify and compare differences in impact
performance and damping effectiveness among various off-road bicycle suspension
systems. Two experiments were conducted to compare suspensions. Fork impact
performance was tested by measuring peak antero-posterior braking forces and impulses
during impact with bumps of 6- and 10-cm height for five mountain bike suspension
systems. These results were compared to a rigid fork condition. Comparisons among
suspension systems showed small but significant differences in performance. While only
marginal differences in peak force were found for the suspension conditions, more
substantial differences in braking impulse were observed. Air-Oil design forks had the
lowest braking impulse for the range of speeds and impact characteristics of this
experiment. In another setting, an analysis of acceleration signals over a range of
frequencies on two surface conditions (gravel and trail) was conducted to assess the
damping effectiveness of the five suspension systems. The mountain bike was equipped
with accelerometers mounted at the axle and frame. A spectral analysis of the signal was
performed for each signal to provide a measure of fork effectiveness. Results showed
that accelerations ranged from -33 to +40 g at the axle and from -13 to +13 g at the
frame, while spectral analyses of the acceleration signals revealed two distinct frequency
regions from 0 to 100 Hz and from 300 to 400 Hz. The various suspension systems were
all effective in attenuating vibration over the first region. Vibration amplitudes at the
frame were considerably less than at the axle for the suspension conditions while similar
axle-frame vibrations were observed with the rigid fork. Lower frequency vibration
amplitudes were typically greater on the trail than on gravel. In the frequency region
between 300-400 Hz, the signal was attenuated at the frame for all conditions including
the rigid fork. The quantification and comparison process of the various suspension forks
using impulse provided an objective marker for performance, and allowed differentiation
between various suspension conditions. Moreover, the effectiveness analysis through the
use of accelerometers provided insight into the range of frequencies dampened by a
suspension. The lower frequency range dampening suggested that effectiveness of a
suspension fork can be quantified even though the experiment did not conclusively
differentiate between the forks. / Graduation date: 2001
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Breakaway an exhibition to explore civic engagement and the cycling community /McKinney, Gwen M. January 1900 (has links)
Thesis (M.S.)--The University of North Carolina at Greensboro, 2009. / Directed by Patrick Lucas; submitted to the Dept. of Interior Architecture. Title from PDF t.p. (viewed Jul. 29, 2009). Includes bibliographical references (p. 97-101).
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The effect of mountain bicycle fork stiffness on impact accelerationOrendurff, Michael 24 October 1996 (has links)
Mountain bike suspension forks have been developed to reduce the
accelerations transmitted to the rider. However, the effectiveness of
suspension forks has not been systematically investigated. It was the goal of
this project to quantify the amount of impact acceleration damping afforded
by three stiffness settings of suspension forks compared to rigid mountain
bike forks.
Seven experienced mountain bike riders gave their informed consent to
participate in the study. The subjects coasted down a ramp and impacted a
bump at 5.4 m/s located about 2.3 m past the ramp end. Accelerometers were
placed on the axle and frame of the bicycle which was fitted with either a rigid fork (FR) or suspension forks set on soft (F1), medium (F3), or firm (F6) stiffness. Bumps were either small (B1), medium (B2) or large (B3). Accelerometer data were telemetered to a computer, sampled at 1000 Hz and smoothed with Butterworth filter with 50 Hz cutoff. Peak acceleration during impact (P1) and landing (P2) as well as the slope of the impact acceleration peak (jerk, J) were extracted from the data and analyzed using a 2 x 3 x 4 repeated measures ANOVA for each of the dependent variables (P1, P2, J),
and with linear contrasts as follow-up tests. A significance level of p<.01 was chosen.
All forks were found to produce similar impact acceleration (P1) at the axle and frame on the small bump (B1). On larger bumps (B2 and B3), softer suspension forks (F1 and F3) significantly reduced acceleration transmitted to the rider during bump impact (P1), while maintaining significantly higher axle acceleration than other forks (p<.001); Jerk was significantly reduced at the frame compared to the axle for each suspension fork with the larger bumps. Landing impacts (P2) were of similar magnitude for most fork conditions at both the axle and frame. It appears from these data that suspension forks with moderate stiffness may provide the best impact acceleration damping for mountain bikes encountering impacts with characteristics similar to the bumps and velocity used in this study. It is unclear how these results generalize to other conditions encountered while riding. / Graduation date: 1997
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Static and dynamic testing of a recumbent bicycle's suspension components, and design of a damping coefficient-spring constant test machineMetaxides, Evangelos 10 March 1995 (has links)
The purpose of this study is to provide the necessary technical
background and data for the development of a suspension system for a
recumbent bicycle. For this reason, the customer requirements-design
criteria for the development of the suspension system were set, and several
static and dynamic tests were conducted on the bicycle's suspension
components in order to determine their shock absorption properties. The
shock absorption properties of the bicycle's components can be used as
means of evaluating the specifications of the suspension system that will
satisfy the established design criteria best. In addition, a test machine that
can be used for damping coefficient and spring constant measurements was
designed to provide further assistance with the analysis of the damping and
elastic properties of the recumbent bicycle's suspension components. It was
designed so that it can also be used for similar testing of other materials
and parts used in the bicycle industry. The subject of this study was BikeE,
a recumbent bicycle that was developed by Professor D. G. Ullman and the
BikeE Corporation in 1992. / Graduation date: 1995
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Effects of a bicycle ergometry program on functional capacity and feelings of control in women with breast cancer /Winningham, Maryl Lynne, January 1983 (has links)
Thesis (Ph. D.)--Ohio State University, 1983. / Includes bibliographical references (leaves 136-146). Available online via OhioLINK's ETD Center
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Bicycle driving characteristics and traffic conflict involvement of a bicyclist populationRowe, Daryl Eugene. January 1975 (has links)
Thesis (Ph. D.)--University of Michigan, 1975. / Also issued in print.
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Bicycle driving characteristics and traffic conflict involvement of a bicyclist populationRowe, Daryl Eugene. January 1975 (has links)
Thesis (Ph. D.)--University of Michigan, 1975. / eContent provider-neutral record in process. Description based on print version record.
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The rise of electric two-wheelers in China : factors for their success and implications for the future /Weinert, Jonathan X. January 1900 (has links)
Thesis (Ph. D)--University of California, Davis, 2007. / Text document in PDF format. Title from PDF title page (viewed on August 28, 2009). "Received by ITS-Davis: December 2007"--Publication detail webpage. Includes bibliographical references (p. 132-140).
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