The first part of this thesis focuses on the theory of a car free city. It does a shallow dive into the theory on garden cities by Ebenezer Howard and how his plans can function as a starting line for this thesis. Furthermore, we take in the concept of how to Copenhagenize a city with Copenhagen itself as a point of interest. The thesis also adds on an answer of what will happen with the cars when they are moved out of the city.A couple of case studies are added as base for the understanding of how this kind of project can function. However, as this thesis is in a new field of study these cases are only partially relevant to the concept since a perfect case does not exist yet.This thesis should serve as an eye opener for both the general public and private investors and municipalities alike. Nowadays as more and more people are focusing green energy and how to minimize pollution in accordance with the Paris decree. A large factor will be on how to modernize our cities. This thesis illustrates the concept of removing the cars from the cities and how such a city infrastructure could work. Also showcases the authors own project that is created in accordance with the concept where he has created the city center for an area that is developed for a car free city.

This paper examines the education, events, and experiences of the Wright brothers in order to determine how they developed the necessary skills to engineer the first viable aircraft. Without high school diplomas, and with no advanced formal education, the Wright brothers were able to develop aircraft that far exceeded the capabilities of aircraft designed and built by professional engineers that had worked on the problem of flight for much longer and with substantially larger research budgets. I argue that the Wright brothers’ success resulted from their experiences in the printing and bicycle industries as well as their formal and informal educations at school and in the home. In the printing business it was their experiences designing and building printing presses, printing newspapers, and operating a job printing shop that taught them how to build machinery and work efficiently and methodically. These same skills were perfected as the Wright brothers managed their second business venture: The Wright Cycle Exchange.While working at the bicycle shop the Wrights learned to be proficient machinists as well as expert mechanics and frame builders. This industry provided them with many skills such as brazing and machining that would be directly applicable to aircraft fabrication. In addition to these skills, building bicycle frames and wheels taught them practical material limits and structural design that informed their aircraft design decisions. Moreover, bicycle design influenced their approach to aircraft control and aerodynamic theory that gave them an edge over other aeronautical experimenters in their race to the sky. When these skills were combined with their rigid religious upbringing, the Wright brothers were uniquely prepared to solve the complex problem of practical human flight. It was the combination of their fabrication skills, understanding of material limits, dogged determination, methodical testing procedures, and their unique approach to aircraft control that was informed by their experiences with bicycles that made them the first in flight.

Over the past twenty years bicycle use as a mode of transportation has grown considerably in the United States. Other studies have examined the individual bicyclist’s risk in proportion to the growth in cycling across cities, a phenomenon referred to as ‘safety in numbers.’ This study expands from that research and examines the effect of cyclists on road safety for all road users. The study examines the roles of bicycle modal split, a city wide analysis, and bicycle infrastructure, a site based analysis, in road safety outcomes. For the city based analysis, twenty years of crash data in 12 California cities were analyzed over a 20 year period. This study primarily used census data and State wide Integrated Traffic Records System (SWITRS) data. This study concludes that as bicycle modal split increases in a city, the traffic fatalities tend to decrease and the relationship is an exponential function. The site based analysis focuses on the effects of installing a bicycle lane on a street and examined its effect on injury crashes. 20 sites in San Francisco, CA that had bike lanes installed on them were compared to 25 control group sites, also in San Francisco, that did not have any bike lanes or other significant changes. An Empirical Bayes method of analysis was done to test its effects and determined that the effects were statistically significant.

This thesis studies the dynamics and stability of some bicycles. The dynamics of idealized bicycles is of interest due to complexities associated with the behaviour of this seemingly simple machine. It is also useful as it can be a starting point for analysis of more complicated systems, such as motorcycles with suspensions, frame flexibility and thick tyres. Finally, accurate and reliable analyses of bicycles can provide benchmarks for checking the correctness of general multibody dynamics codes. The first part of the thesis deals with the derivation of fully nonlinear differential equations of motion for a bicycle. Lagrange’s equations are derived along with the constraint equations in an algorithmic way using computer algebra.Then equivalent equations are obtained numerically using a Newton-Euler formulation. The Newton-Euler formulation is less straightforward than the Lagrangian one and it requires the solution of a bigger system of linear equations in the unknowns. However, it is computationally faster because it has been implemented numerically, unlike Lagrange’s equations which involve long analytical expressions that need to be transferred to a numerical computing environment before being integrated. The two sets of equations are validated against each other using consistent initial conditions. The match obtained is, expectedly, very accurate. The second part of the thesis discusses the linearization of the full nonlinear equations of motion. Lagrange’s equations have been used.The equations are linearized and the corresponding eigenvalue problem studied. The eigenvalues are plotted as functions of the forward speed ν of the bicycle. Several eigenmodes, like weave, capsize, and a stable mode called caster, have been identified along with the speed intervals where they are dominant. The results obtained, for certain parameter values, are in complete numerical agreement with those obtained by other independent researchers, and further validate the equations of motion. The bicycle with these parameters is called the benchmark bicycle. The third part of the thesis makes a detailed and comprehensive study of hands-free circular motions of the benchmark bicycle. Various one-parameter families of circular motions have been identified. Three distinct families exist: (1)A handlebar-forward family, starting from capsize bifurcation off straight-line motion, and ending in an unstable static equilibrium with the frame perfectly upright, and the front wheel almost perpendicular. (2) A handlebar-reversed family, starting again from capsize bifurcation, but ending with the front wheel again steered straight, the bicycle spinning infinitely fast in small circles while lying flat in the ground plane. (3) Lastly, a family joining a similar flat spinning motion (with handlebar forward), to a handlebar-reversed limit, circling in dynamic balance at infinite speed, with the frame near upright and the front wheel almost perpendicular; the transition between handlebar forward and reversed is through moderate-speed circular pivoting with the rear wheel not rotating, and the bicycle virtually upright. In the fourth part of this thesis, some of the parameters (both geometrical and inertial) for the benchmark bicycle have been changed and the resulting different bicycles and their circular motions studied showing other families of circular motions. Finally, some of the circular motions have been examined, numerically and analytically, for stability.

Thesis (M.Tech.: Chiropractic)-Dept. of Chiropractic, Durban Institute of Technology, 2006 129, [21] leaves / The first objective was to investigate the injury profiles of South African cyclists, especially those relating to mountain bicycle use on the road, as there appears to be no knowledge available on mountain bicycle use on the road and related injuries. Secondly, to see if there is an association between injuries and bicycle set-up in a South African context.

In January, 2009, I joined Bikes Across Borders, a local grassroots organization, on their yearly bike caravan to Mexico. The group works to promote bicycles, both here and in Mexico, as an environmentally and financially sound alternative to motorized transportation. Each winter, members ride bicycles they build out of salvaged parts to border cities in Mexico. They give these bicycles to maquiladora workers who would otherwise spend a large portion of their income on transportation. These workers make a fraction of what they would in the U.S. and live in shacks amid the pollution from the factories they work in. This is the story of one group’s attempt at making a difference in the lives of these workers. / text

As cities worldwide plan for increasing urbanization levels, new challenges in mobility will arise. Any approach taken to address these new issues will need to consider how to move more people with declining resources, thus the need for a sustainable solution arises. This thesis examines the growing trend of cities creating public bicycle systems as a means to add sustainability to a transportation system and identifies what are the criteria and indicators of a sustainable public bicycle. The criteria and indicators are used to examine data collection techniques of three Public Bicycle Systems in the United States: Capital Bikeshare in Washington, D.C., Nice Ride in Minneapolis, Minnesota and Denver B-Cycle in Denver, Colorado.

A dissertação apresenta um estudo de caso realizado na linha 4 - amarela do metrô da cidade de São Paulo, visando analisar os fatores que influenciam o uso da bicicleta no acesso às estações dessa linha. Foram realizadas 500 entrevistas nas plataformas de embarque, e nos bicicletários e pontos de bicicleta compartilhada próximos às estações da linha 4. O questionário utilizado tinha questões sobre a viagem interceptada e outros hábitos de viagem, características socioeconômicas dos entrevistados, além de solicitar o grau de concordância dos usuários com respeito a 12 afirmações relacionadas a fatores que influenciam positiva ou negativamente o uso da bicicleta. Uma análise descritiva da amostra permitiu uma avaliação preliminar das diferenças entre aqueles que acessam as estações por bicicleta e os que utilizam outros modos de transporte. Foram em seguida realizadas análises de correspondência simples que indicaram diferenças estatisticamente significativas quanto a comportamentos e hábitos de viagem entre ciclistas e usuários de outros modos para o acesso à estação. Finalmente, as respostas às 12 afirmações foram submetidas a uma análise fatorial por componentes principais, que levou à extração de três componentes principais: o primeiro relativo a aspectos que favorecem o uso da bicicleta (economia de tempo, dinheiro, infraestrutura e outros); referente ao ambiente (clima e topografia); e à segurança (pessoal e no trânsito). Os valores desses três componentes para cada indivíduo da amostra foram utilizados para a construção de um indicador de afinidade com o uso da bicicleta, que permitiu classificar os entrevistados em três grupos: Ciclistas, Potenciais Ciclistas e Não Ciclistas. A análise comparativa dos grupos gerados pelo indicador permitiu a identificação das características que distinguem os usuários de cada grupo, representando fatores importantes na decisão pelo uso da bicicleta. O conhecimento desses fatores e a maneira como influenciam os usuários é importante ferramenta para orientar a elaboração de políticas públicas que buscam aumentar o uso da bicicleta no acesso e integração com estações de metrô. / This dissertation presents a case study conducted on line 4 - Yellow of the São Paulo subway. The objective is to analyse factors influencing the use of bicycles as the access mode to subway stations. 500 interviews were conducted on metro platforms, as well as public bicycle racks and shared bicycle stations in the proximity of line 4 stations. The questionnaire includes questions about the intercepted trip and other travel habits, user socioeconomic characteristics, and assessment of user concordance with 12 statements representing factors that influence positively or negatively the use of bicycles. A descriptive analysis allowed a preliminary assessment of differences between those accessing stations by bicycle and by other modes. Simple correspondence analysis indicated statistically significant differences regarding travel behavior and habits between bike users and users of other modes for station access. Finally, a principal component analysis was conducted with answers to the 12 statements. Three principal components were extracted: a first component including aspects favouring bicycle use (time and money savings, the presence of cycling infrastructure, etc.); a second component representing environmental factors (climate and topography); and a third component representing aspects of personal security and traffic safety. An index of affinity with bicycling was proposed, based on the value of the three components for each individual in the sample, allowing the identification of three groups: Cyclists, Potential Cyclists and Non-cyclists. A comparative analysis of the groups revealed the characteristics that distinguish them, representing important factors in the decision to use bicycles. The understanding of these factors and their influence on users is an important tool to guide policy formulation aiming to increase the use of bicycle for modal integration with the subway.

A dissertação apresenta um estudo de caso realizado na linha 4 - amarela do metrô da cidade de São Paulo, visando analisar os fatores que influenciam o uso da bicicleta no acesso às estações dessa linha. Foram realizadas 500 entrevistas nas plataformas de embarque, e nos bicicletários e pontos de bicicleta compartilhada próximos às estações da linha 4. O questionário utilizado tinha questões sobre a viagem interceptada e outros hábitos de viagem, características socioeconômicas dos entrevistados, além de solicitar o grau de concordância dos usuários com respeito a 12 afirmações relacionadas a fatores que influenciam positiva ou negativamente o uso da bicicleta. Uma análise descritiva da amostra permitiu uma avaliação preliminar das diferenças entre aqueles que acessam as estações por bicicleta e os que utilizam outros modos de transporte. Foram em seguida realizadas análises de correspondência simples que indicaram diferenças estatisticamente significativas quanto a comportamentos e hábitos de viagem entre ciclistas e usuários de outros modos para o acesso à estação. Finalmente, as respostas às 12 afirmações foram submetidas a uma análise fatorial por componentes principais, que levou à extração de três componentes principais: o primeiro relativo a aspectos que favorecem o uso da bicicleta (economia de tempo, dinheiro, infraestrutura e outros); referente ao ambiente (clima e topografia); e à segurança (pessoal e no trânsito). Os valores desses três componentes para cada indivíduo da amostra foram utilizados para a construção de um indicador de afinidade com o uso da bicicleta, que permitiu classificar os entrevistados em três grupos: Ciclistas, Potenciais Ciclistas e Não Ciclistas. A análise comparativa dos grupos gerados pelo indicador permitiu a identificação das características que distinguem os usuários de cada grupo, representando fatores importantes na decisão pelo uso da bicicleta. O conhecimento desses fatores e a maneira como influenciam os usuários é importante ferramenta para orientar a elaboração de políticas públicas que buscam aumentar o uso da bicicleta no acesso e integração com estações de metrô. / This dissertation presents a case study conducted on line 4 - Yellow of the São Paulo subway. The objective is to analyse factors influencing the use of bicycles as the access mode to subway stations. 500 interviews were conducted on metro platforms, as well as public bicycle racks and shared bicycle stations in the proximity of line 4 stations. The questionnaire includes questions about the intercepted trip and other travel habits, user socioeconomic characteristics, and assessment of user concordance with 12 statements representing factors that influence positively or negatively the use of bicycles. A descriptive analysis allowed a preliminary assessment of differences between those accessing stations by bicycle and by other modes. Simple correspondence analysis indicated statistically significant differences regarding travel behavior and habits between bike users and users of other modes for station access. Finally, a principal component analysis was conducted with answers to the 12 statements. Three principal components were extracted: a first component including aspects favouring bicycle use (time and money savings, the presence of cycling infrastructure, etc.); a second component representing environmental factors (climate and topography); and a third component representing aspects of personal security and traffic safety. An index of affinity with bicycling was proposed, based on the value of the three components for each individual in the sample, allowing the identification of three groups: Cyclists, Potential Cyclists and Non-cyclists. A comparative analysis of the groups revealed the characteristics that distinguish them, representing important factors in the decision to use bicycles. The understanding of these factors and their influence on users is an important tool to guide policy formulation aiming to increase the use of bicycle for modal integration with the subway.

Thesis. 1977. B.S.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaf 40. / B.S.