Trajectory control of vehicles during a tyre blowout: A simulation study
In this paper, the experiment of trajectory control of vehicle during a tyre blowout is carried out. Firstly, the evaluation criteria of motion vehicles during a tyre blowout are determined. Then, motion vehicle with a static PID controller in highway is discussed. Simulation results show that the static PID controller determined at a certain speed is not fit for the other speed as well. Instead, a gain scheduling PID controller is adopted to handle the trajectory control problem of vehicles during a tyre blowout, where parameters of the gain-scheduling PID controller are calibrated with the varying speed. It shows that the vehicle can avoid yawing as well as keep the driving stability during the tyre blowout, and drive back to the original path after a small offset.
3-Dimensional Simulation of Vehicle Response to Tire Blow-outs
Sudden tire deflation, or blow-out, is sometimes cited as the cause of a crash. Safety researchers have previously attempted to study the loss of vehicle control resulting from a blow-out with some success using computer simulation. However, the simplified models used in these studies did little to expose the true transient nature of the handling problem created by a blown tire. New developments in vehicle simulation technology have made possible the detailed analysis of transient vehicle behaviour during and after a blow-out. This paper presents the results of an experimental blow-out study with a comparison to computer simulations. In the experiments, a vehicle was driven under steady state conditions and a blow-out was induced at the right rear tire. Various driver steering and braking inputs were attempted, and the vehicle response was recorded. These events were then simulated using Engineering Dynamics Vehicle Simulation Model (EDVSM). A comparison between experimental and simulated results is presented. The research was extended by simulating blow-outs at other wheel locations, and observing how various driver inputs affect the vehicle's response. (A) For the covering abstract of the publication see IRRD E200601.
Accurate measurements of output characteristics and detonations of motorbike high-speed racing engine and their optimization at actual atmospheric conditions and combusted mixture composition
Abstract At a motorbike high speed racing engine there is very important an output engine characteristics which depends significantly on a detonation combustion rate, atmospheric conditions and a combusted mixture composition. The combustion process has got a relevant influence on a wear degree of main engine parts or on their damage eventually. The detonation combustion rate is very important because this kind of burning can be not only destructive but a useful phenomenon, as well. If the process of detonation burning is kept on a certain level, it can help significantly to the next increasing of an engine power output. In this article there is described the measurements of output characteristics of a high-speed racing engine which were performed by means of a data-recording system and the detonation combustion was evaluated using a quantitative method. The actual values of atmospheric conditions and the mixture composition were added to the measured values. Then the obtained values are compared visually with a damage degree of an engine piston caused by the detonation burning. The result is a limit value expressed in a number of detonation units related to a run distance interval of the vehicle driven by the high-speed racing engine. In framework of this run distance interval there is the process of detonation burning profitable. As well as it increases an engine power output and together it is not destructive with regard to engine design parts.