557 research outputs found

    Image-Based Lateral Position, Steering Behavior Estimation, and Road Curvature Prediction for Motorcycles

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    International audienceThis letter presents an image-based approach to simultaneously estimate the lateral position of a powered-two-wheeled vehicle on the road, its steering behavior and predict the road curvature ahead of the motorcycle. This letter is based on the inverse perspective mapping technique combined with a road lanes detection algorithm capable of detecting straight and curved lanes. Then, a clothoid model is used to extract pertinent information from the detected road markers. Finally, the performance of the proposed approach is illustrated through simulations carried out with the well-known motorcycle simulator “BikeSim.” The results are very promising since the algorithm is capable of estimating, in real time, the road geometry and the vehicle location with a better accuracy than the one given by the commercial GPS

    Gyroscopic stabilisers for powered two-wheeled vehicles

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    © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. This paper illustrates the potential of a gyroscopic stabiliser for the stabilisation of single-track vehicles, at low and high speed as well as during braking. Alternative systems are considered, including single and twin counter-rotating gyroscopes, spinning and precessing with respect to different axes, either freely (passive stabilisers) or in a controlled way (active stabilisers). A suitable mathematical model has been developed and stability has been investigated both by eigenvalue calculation and time domain simulations. It has been found that the most effective configuration is one where the gyroscope(s) spin with respect to an axis parallel to the wheels' spin axis and swing with respect to the vehicle yaw axis. Passive systems may effectively stabilise both weave and wobble at medium and high speed, but cannot stabilise the vehicle at low and zero speed. On the contrary, actively controlled gyroscopes are capable of stabilising the vehicle in its whole range of operating speed, as well as during braking. The alteration of the original vehicle handling characteristics is negligible when active counter-rotating gyroscopes are used, and still acceptable if a single gyroscope is adopted instead

    Low Speed Motorcycle Stabilization Device

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    The objective for this Major Qualifying Project was to design and prototype a low speed motorcycle stabilization device for a partially handicapped customer. The system would remove the need for the rider of the motorcycle to place his feet on the ground at low speeds or stops, but allow uninhibited motorcycle riding at standard to high speeds. The project focused on three major aspects, the mechanical assembly, fluid power, and microprocessor control. The outrigger deploys at 14 miles per hour with some compliance for low speed turns and becomes increasingly rigid until 4 miles per hour when the device locks to keep the motorcycle steady at a stop. The prototype system has been installed on a Harley Davidson Sportster

    Human Powered Recreation Vehicle

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    The motivation for this project was to design and build a human powered vehicle for the main purpose of recreation. The target clients for the project are adult victims of stroke who now suffer from hemiparesis. After researching the current market and resources for recreation, the team developed four preliminary concepts, used a morph chart to select the best features from each, and designed a final prototype. The prototype was built using the frame from a Mobo Trike and incorporating modifications such that the tricycle is operated with the right side of the body exclusively. The final prototype meets all functional requirements outlined at the start of the project

    Design of Urban Transit Rowing Bike

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    The objective of this project was to create a human-powered vehicle as a mode of urban transport that doubles as a complete exercise system. The project was constrained in scope by the requirement of affordability, under $1,000. This was accomplished through reducing complexity by utilizing a cable and pulley drive train, simplified tilting linkage and electric power assist in place of variable gears. This project successfully demonstrates that rowing can be the basis for effective human powered urban transport

    A Linear Parameter-Varying Control Method for Inline Wheel Systems

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    The design of the bicycle and other single-track systems are continually evolving and have become a key tool for people and goods transportation worldwide [1],[2]. The form factor, carrying capacity, maneuverability, and cost of single-track vehicles makes them advantageous in a variety of circumstances and justifies their use case in the 21st Century [2] [3],[4]. As autonomous double track vehicles arrive on public roads, it is natural that single-track autonomous systems will be developed as well; however, the unstable and non-minimum phase dynamics of single-track vehicles make their control have an additional layer of complexity compared to double track vehicles. Although many researchers have provided commentary on the stability and tracking of a riderless bicycle, relatively few bodies of work have validated their analysis through experimental testing. This work successfully demonstrates that, through gain scheduling, a PID-type controller can balance a riderless single-track vehicle by using a linear actuator to implement front-fork steering control. This control system is novel in the way in which the front fork is actuated. The manual PID tuning process outlined in this body of work is also unique, as well as the specifics of the control law (although PID controllers have been used by other authors). The works of other authors on this topic is briefly summarized and a second-order dynamics system model is derived. Then controller analysis is simulated and then validated experimentally. Suggestions are also made on next steps that can be taken to build upon the work outlined in this thesis.MSEElectrical Engineering, College of Engineering & Computer ScienceUniversity of Michigan-Dearbornhttp://deepblue.lib.umich.edu/bitstream/2027.42/169157/1/Ronald Smith Final Thesis.pd

    Vibration Analysis of Narrow Tilting Three-Wheeled Vehicle Suspension System During Cornering

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    In Indonesia, there are a lot of vehicle on the road. These vehicles are used by the owner even there are only one or two passangers. That is the main reason of traffic jam in Indosia. However, motorbike is the best solution to fully use all part of the road that is provided in Indonesia because of its size, despite of motorbike has less safety than car. Therefore, combination between motorbike and car advantages have to be delivered through new type of vehicle which is narrow tilting three-wheeled vehicle. The goal that we want to achive from this final project is to test the vibration which affected the Narrow Tilting Three-Wheeled Vehicle (NTTWV). The condition that we analize is when the Narrow Tilting Three-Wheeled Vehicle (NTTWV) oscilliating during cornering. This condition is important because in Indonesia, there are a lot of hole located on the cornering part of the road. This is important in order to make the vehicle comfortable to be use in any condition. To have a better analysis, we use three variation which are suspension angle, spring constant and length of the arm. From the research, we could conclude that in order to feel less vibration acceleration we have to decrease the spring constant. Another way to lessen the vibration impact, we could lowering the suspension angle. Lastly, we could extend the arm length in order to have lower vibration impact

    Santa Clara University human powered vehicle 2013-2014

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    This document discusses the conceptual design for the 2013-2014 Santa Clara University Human Powered Vehicle. The objective of the Santa Clara University Human Powered Vehicle team is to design and manufacture a human powered vehicle that is practical, sustainable, and efficient. Key design features include a partial body fairing, tilt and ackermann steering, and cargo space. Ultimately we had to block out the tilt steering because its operation conflicted with the Ackermann steering. This vehicle\u27s design satisfies the primary needs of a commuter and ultimately serves as a practical alternative to an automobile. Finally, this design complies with the requirements set by the American Society of Mechanical Engineers for the 2014 Human Powered Vehicle Challenge West Competition

    Strike 3000: Standing Electric Trike

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    In the past decade there has been much research conducted on maintaining a healthy lifestyle, even in sedentary activities. It is clear to see this trend in the rising popularity of standing desks, ergonomic mice and keyboards, and the plethora of applications that remind the user not to stay inactive for too long. Ken Howes suggests that this revolution be brought to the world of motor vehicles with his proposed concept of the Strike 3000: an electric-powered three-wheeled vehicle that keeps the operator in a standing position while still maintaining all of the functionality and reliability of a standard automobile. To accomplish this goal, the members of Team 4 conducted thorough technical research into existing patents, competitive designs, and literature concerned with the essentials in designing a vehicle. With the information that was gathered, Team 4 then began to generate design concepts for every component of the vehicle including the chassis, steering, braking, suspension, etc. Together the team generated over one-hundred and fifty concepts. The team also conducted a Quality Function Deployment comparison to create a visual representation of how each component of the vehicle will help meet the wants of the sponsor as well as a comparison between the Strike 3000 and other competitive products. This gave the team a better understanding of what components were important to focus on and which could be sacrificed in order to improve the most essential parts. After the foundation work of the design was completed, Team 4 and Ken Howes collaborated to design a chassis to the aesthetic standards of Mr. Howes’ proposed design while making necessary revisions to keep the design technically acceptable. At the start of the second semester, Team 4 had sent out a final design and engineering drawing to a local welder for construction of the chassis. They ordered all the parts to be implemented into the vehicle. When the chassis arrived they began assembling the vehicle in the Kirk Machine Shop so that custom parts, such as suspension mounts and tie rods could be welded and modifications to the chassis could be made accordingly. The team was able to finish the construction with a lot of help from Nick Ladyga, a member of the team who lead the build effort. The motor was not able to be installed by the time of the Design Showcase but with technical documentation and guidance the team will be able to help Mr. Howes complete the vehicle in a short amount of time

    Two wheeled lunar dumptruck

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    The design of a two wheel bulk material transport vehicle is described in detail. The design consists of a modified cylindrical bowl, two independently controlled direct drive motors, and two deformable wheels. The bowl has a carrying capacity of 2.8 m (100 ft) and is constructed of aluminum. The low speed, high HP motors are directly connected to the wheels, thus yielding only two moving parts. The wheels, specifically designed for lunar applications, utilize the chevron tread pattern for optimum traction. The vehicle is maneuvered by varying the relative angular velocities of the wheels. The bulk material being transported is unloaded by utilizing the motors to oscillate the bowl back and forth to a height at which dumping is achieved. The analytical models were tested using a scaled prototype of the lunar transport vehicle. The experimental data correlated well with theoretical predictions. Thus, the design established provides a feasible alternative for the handling of bulk material on the moon
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