Klets D. Conception of Steady Automobile Stability and Steerability Parameters

Thesis for a Doctor Degree in Technical Sciences: speciality 05.22.20 - Operation and Repair of Vehicles. - Kharkiv National Automobile and Highway University, Ministry of Education and Science of Ukraine, Kharkiv, 2015. This thesis deals with the actual scientific problem of the high performance and safety parameters of wheeled vehicles due to the improvement of the steady state of their stability and steerability under variable operating conditions. On the basis of the cybernetic approach the refined definitions and evaluation criteria, which enable to correctly define the concepts and parameters of the manoeuvrability, stability and steerability of wheeled vehicles as well as their relationships, are made. The impact of operating conditions upon the formation of the parameters is evaluated. The mobile registration and measuring complex to dynamically test wheeled vehicles is synthesised. The scientific fundamentals of the system-based support of automobile manoeuvrability with application of new operating principles and artificial intelligence components are developed. The rational parameters of heading angle dynamic stabilisation during automobile yawing are determined: heading angle stabilisation time; initial actuating (stabilising) angular acceleration; circular frequency of torque. The experimental research of automobile stability and steerability is conducted. The practical significance of the results is confirmed by industrial implementation of the methods during forensic autotechnical expert examination and road accidents studying, research and development efforts, the diagnostics of a technical state and the investigation of the traffic conditions of wheeled vehicles. Key words: safety, operation, dynamism, manoeuvrability, steerability, stability, intelligent platform, stabilisation.