Objective of this thesis is design of brake system of new car Formula Student class – Dragon 3. This car was built by students of faculty of mechanical engineering on Brno university of technology. Brake parts selection is described as well as designing hydraulic brake line circuits optimized for stable braking behavior on tracks of Formula Student competitions. One of main parts of this thesis is design of front and rear custom brake discs with related parts. These parts are FEM analyzed. In the end the whole brake system fitted on Dragon 3 car is tested on track and its performance is analyzed too.

No / Braking system characteristics, brake system performance and brake system component design parameters that influence brake pedal ‘feel’ in a passenger car have been studied using the simulation modelling package AMESim, in particular to model the linear and nonlinear characteristics of internal components. A passenger car hydraulic brake system simulation model incorporating the brake pedal, booster, master cylinder, brake lines and calipers has been developed to predict brake system response to assist in the design of braking systems with the desired brake pedal force / travel characteristic characteristics to create good brake pedal ‘feel’. This has highlighted the importance of system components, in particular the master cylinder and caliper seal deformation, and the operating characteristics of the booster in determining the brake pedal force / travel characteristic. The potential contribution of these 3 components to brake pedal ‘feel’ improvement has been investigated, and the results of the AMESim model have been verified using experimental measurement data. The model can be used in the future to provide an accurate prediction of brake system response at the design stage thereby saving time and cost.

Sailboat winches are used to help sailors manipulate the control lines that control the position and shape of the sails. Unlike most winches sailboat winches usually only have the ability to winch in the rope, but not to reverse. To reverse the line a sailor needs to manually manipulate it, this is both inconvenient and can also be a safety hazard. This master’s thesis will focus on the development of a self-locking braking system that will be used to allow a sailboat winch to reverse. The goal of the thesis is to design a braking system that works with a modified version of the E40i winch produced by Seldén. The braking system that was developed during this thesis is made up of two main parts, a one-way mechanism and a brake. The type of one-way mechanism that was chosen was an overrunning roller clutch. For the brake a wet disk brake was chosen with an outer diameter of 50mm and an inner diameter of 28.8mm. A 3D model of the braking system has been generated and materials have been selected so that the system is ready for prototyping and physical testing.

The implementation of In-Vehicle Intelligent Transport Systems (ITS) is becoming a common occurrence in modern vehicles. Automobile manufacturers are releasing vehicles with many forms of sophisticated technologies that remove much of the responsibility of controlling an automobile from the driver. These In-Vehicle Intelligent Transport Systems have stemmed from a genuine need in regards to road safety, however there are advantages and disadvantages associated with ITS. Each different form of technology has its own inherent compromises in relation to road safety, driver behaviour and driver comfort. This thesis outlines the benefits and detrimental effects associated with current In-Vehicle Intelligent Transport Systems and details the development and user interface testing of an adaptive brake light. The adaptive brakelight concept aims to provide drivers with the advantages of an In-Vehicle ITS whilst removing the disadvantages. The technology will help drivers judge the braking pattern of the car in front, thus allowing them to react appropriately and potentially reducing the occurrence of rear-end crashes. The adaptive brake light concept was tested in comparison to a standard brake light and BMW inspired brake light in a series of user interface tests. The adaptive brake light was shown overall to be an improved method of displaying the varying levels of deceleration of a lead vehicle. Whilst different age and gender groups responded differently to the adaptive brake light, it was shown to be of benefit to the majority and the most at risk groups responded positively to the adaptive brake light. This research shows that an adaptive brake light can provide a benefit in regards to road safety when compared to a standard brake light interface. It is hoped that further development of variable brake lights will result from this research and possibly lead to the implementation of the technology to automobiles and other forms of transport.

Design of braking system for the formula student car. Calculation of basic forces acting in the braking system. Mechanical analysis of the most important parts of the braking system. Manufacturing of brake pedal. Assembly brake components to brake system.

Les instabilités vibratoires, telles que le crissement de frein, sont souvent étudiées par des analyses aux valeurs propres complexes sur des modèles éléments finis (EF). L'objectif de cette thèse est d'enrichir ces modèles en prenant en compte la viscoélasticité dont les effets sont l'amortissement et la rigidification des matériaux en fonction de la fréquence. Pour cela un viscoanalyseur a été développé. Il permet de caractériser en cisaillement les matériaux entre 100 et 3500Hz, sans utiliser les équivalences temps-température. Ce viscoanalyseur permet d'alimenter en paramètres le modèle rhéologique de Maxwell généralisé par le biais d'une nouvelle méthode d'identification particulièrement robuste. Le modèle de Maxwell généralisé est ensuite introduit dans les modèles EF grâce à un modèle d'état projeté sur un sous-espace adéquat. Ces modèles améliorés prédisent moins d'instabilités du fait de l'amortissement, mais ils montrent également que la viscoélasticité peut avoir des effets de déstabilisation du fait de la rigidification. / The vibratory instabilities, such as the brake squeal noise, are often studied by complex Eigenvalues analysis (CEA) on finite elements models (FE). The purpose of this thesis is to improve these models by taking the material viscoelasticity into account which induces damping and stiffening of materials according to the frequency.For that a tester was developed. It makes it possible to characterize the shearing behavior of materials between 100 and 3500Hz, without using time-temperature equivalences. This tester allows feeding in parameters the rheological model of generalized Maxwell by the means of a new robust identification method. The generalized Maxwell model is then introduced into FE models thanks to a state-space model on an accurate subspace.These improved models predict less instability occurrences because of damping, but they also show that viscoelasticity may induce destabilization because of stiffening.

Tem como objetivo estudar e otimizar o desempenho de frenagem do ônibus biarticulado que trafega nas grandes cidades brasileiras. Apresenta-se um estudo do sistema de freios do veículo e propõe-se um modelo matemático para o cálculo de todas as forças que agem no sistema de freio e nas rodas. O programa computacional calcula as forças de frenagem que atuam nos eixos, as forças verticais nos eixos, as forças de inércia, o coeficiente de adesão utilizado por eixo, a desaceleração do veículo, o espaço de parada e a eficiência do sistema de freio. Os resultados são confrontados com a norma internacional ECE-R13 a fim de verificar se o veículo obedece aos requisitos estabelecidos pela mesma. / This work is concerned with the study optimization the breaking system of a biaticulated bus, which circulates in many Brazilian cities. The vehicle brake system is studied and a mathematical model is proposed in order to calculate all forces in the brake systems and in the wheels. Based on a computational program the brake force in the axles, the vertical forces in the axles, the inertia forces, the adhesion coefficient requested by each axles, the vehicle deceleration, the brake distance and the brake system efficiency are calculated. The results are compared with the international standard ECE-R13 to verify whether the bus satisfies the regulation.

Tem como objetivo estudar e otimizar o desempenho de frenagem do ônibus biarticulado que trafega nas grandes cidades brasileiras. Apresenta-se um estudo do sistema de freios do veículo e propõe-se um modelo matemático para o cálculo de todas as forças que agem no sistema de freio e nas rodas. O programa computacional calcula as forças de frenagem que atuam nos eixos, as forças verticais nos eixos, as forças de inércia, o coeficiente de adesão utilizado por eixo, a desaceleração do veículo, o espaço de parada e a eficiência do sistema de freio. Os resultados são confrontados com a norma internacional ECE-R13 a fim de verificar se o veículo obedece aos requisitos estabelecidos pela mesma. / This work is concerned with the study optimization the breaking system of a biaticulated bus, which circulates in many Brazilian cities. The vehicle brake system is studied and a mathematical model is proposed in order to calculate all forces in the brake systems and in the wheels. Based on a computational program the brake force in the axles, the vertical forces in the axles, the inertia forces, the adhesion coefficient requested by each axles, the vehicle deceleration, the brake distance and the brake system efficiency are calculated. The results are compared with the international standard ECE-R13 to verify whether the bus satisfies the regulation.

We investigate the existence of a symmetric singular periodic brake orbit in the equal mass, fully symmetric planar four body problem. Using regularized coordinates, we remove the singularity of binary collision for each symmetric pair. We use topological and symmetry tools in our investigation.

Road and rail vehicles and aircraft rely mainly or solely on friction brakes. These brakes pose several problems, especially in hybrid vehicles: significant wear, fading, complex and slow actuation, lack of fail-safe features, increased fuel consumption due to power assistance, and requirement for anti-lock controls. To solve these problems, a contactless magnetic brake has been developed. This concept includes a novel flux-shunting structure to control the excitation flux generated by permanent magnets. This brake is wear-free, less-sensitive to temperature than friction brakes, has fast and simple actuation, and has a reduced sensitivity to wheel-lock. The present dissertation includes an introduction to friction braking, a theory of eddy-current braking, analytical and numerical models of the eddy-current brake, its excitation and power generation, record of experimental validation, investigation and simulation of the integration of the brake in conventional and hybrid vehicles.