Current Issue : July - September Volume : 2018 Issue Number : 3 Articles : 5 Articles
All automobile manufacturing companies, Google and Microsoft have announced\nrecently their production of the Fully Automated Autonomous Vehicles\n(FAAVs), otherwise known as driverless cars. A few FAAVs would be\navailable in the market as early as in 2018, but mostly in 2020�s. When FAAVs\nwill be available to and become affordable by the average consumers, the implications\nto the society would be far reaching. The purpose of the paper is to\nexamine the prospect of the popularity of FAAVs and their socio-economic\nimplications to the future society of the World. The paper examines potential\nimpacts on selected sectors of the society including changes in demand for\nautomobiles, its impact on the use of oil, on the environment, and on urban\nland uses, to list a few....
The quantitative description is given to three-dimensional micro and macro self-similar characteristics of road surface from\nthe perspective of fractal geometry using FBM stochastic midpoint displacement and diamond-square algorithm in conjunction\nwith fractal characteristics and statistical characteristics of standard pavement determined by estimation method of box-counting\ndimension.Thecomparative analysis between reconstructed three-dimensional road surface spectrum and theoretical road surface\nspectrum and correlation coefficient demonstrate the high reconstruction accuracy of fractal reconstructed road spectrum.\nFurthermore, the bump zone is taken as an example to reconstruct amore arbitrary 3D road model through isomorphism of special\nroad surface with stochastic road surface model.Measurement is taken to assume the tire footprint on road surface to be a rectangle,\nwhere the pressure distribution is expressed with mean stiffness, while the contact points in the contact area are replaced with a\nnumber of springs. Two-DOF vehicle is used as an example to analyze the difference between three-dimensional multipoint-andplane\ncontact and traditional point contactmodel.Three-dimensional road surface spectrum provides amore accurate description\nof the impact effect of tire on road surface, thereby laying a theoretical basis for studies on the dynamical process of interaction of\nvehicle-road surface and the road friendliness....
This research developed a novel proportional pressure control valve for an automobile\nhydraulic braking actuator. It also analyzed and simulated solenoid force of the control valves, and the\npressure relief capability test of electromagnetic thrust with the proportional valve body. Considering\nthe high controllability and ease of production, the driver of this proportional valve was designed\nwith a small volume and powerful solenoid force to control braking pressure and flow. Since the\nproportional valve can have closed-loop control, the proportional valve can replace a conventional\nsolenoid valve in current brake actuators. With the proportional valve controlling braking and\npressure relief mode, it can narrow the space of hydraulic braking actuator, and precisely control\nbraking force to achieve safety objectives. Finally, the proposed novel proportional pressure control\nvalve of an automobile hydraulic braking actuator was implemented and verified experimentally....
The aim of this work is to integrate and analyze the performance of a path planning method based on Time Elastic Bands (TEB) in\nreal research platformbased on Ackermannmodel.Moreover, it will be proved that allmodules related to the navigation can coexist\nand work together to achieve the goal point without any collision. The study is done by analyzing the trajectory generated from\nglobal and local planners. The software prototyping tool is Robot Operating System (ROS) fromOpen Source Robotics Foundation\nand the research platform is the iCab (Intelligent Campus Automobile) from University Carlos III. This work has been validated\nfroma test inside the campuswhere the iCab has performed the navigation between the starting point and the goal pointwithout any\ncollision. During the experiment, we proved the low sensitivity of the TEB method to variations of the vehicle model configuration\nand constraints....
This paper deals with the development of a numericalmodel, based on the Finite Element (FE) theory for the prediction of the squeal\nfrequency of a railway disc brake.The analytical background has been discussed and presented, as well as the most efficient methods\nfor evaluating the system stability; the attention has been paid particularly to the complex eigenvalues method, which has been\nadopted within this paper to investigate the railway disc brake system. Numerical results have been compared with measurements\nfromexperimental tests in order to validate the proposed numerical approach. At the end of this work, a sensitivity analysis, aimed\nat understanding the effects of some physical parameters influencing the stability of the brake system and the squeal propensity,\nhas been carried out....
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