Mobility and Vehicle Mechanics

1-12

Authors: Sunny Narayan, Ivan Grujić, Nadica Stojanović, Kaisan Muhammad Usman, Abubakar Shitu, Faisal O. Mahroogi

Study of combustion process in engines often rely on various diagnosis techniques which are based on acquisition of in cylinder pressure. In this work various tests were conducted to analyse the working of a gasoline engine by varying the load, speed and amount of fuel injected inside the cylinder. Effects of varying these operational parameters on in cylinder pressure, heat release rate and rate of rise of in cylinder pressure was analysed.

27-37

Authors: Zoran Papić, Vuk Bogdanović, Goran Štetin, Nenad Saulić

Energy Equivalent Speed value (EES) is the base of energy method for crash velocity assessment. Estimation of EES value is based on deformation depth and a vehicle stiffness coefficient. Vehicles that are damaged in traffic accidents are usually unavailable for accidents experts so they have to rely on photographs of those vehicles. Development of 3-D photogrammetry and leading software solutions in the field of photogrammetry allowed more detailed overview of deformation on vehicles that were involved in accidents. One of those software solution, that provide 3D models from pictures taken in the planned photo session, is PhotoModeler Scanner. By comparing 3D models of a damaged and undamaged vehicle, experts can get more insight into the type and damage intensity. Analysing those 3D models, information about deformation depth are obtained. This paper shows the procedure of forming a 3D model of an undamaged vehicle created from photographs that were taken in the planned photo session and processed in PhotoModeler Scanner software. This model was compared with a 3D model of the same type of vehicle made from photographs taken at the accident spot. Based on measurements that are taken from those 3D models, the main elements for EES estimation are determined.

51-60

Authors: Rosen Hristov, Krasimir Bogdanov, Radostin Dimitrov

Problem of vehicle noise has been observed since the appearance of the larger number of vehicles on the roads. Drivers and passengers are exposed to constant noise and vibration originating from their own vehicles and all other vehicles participating in traffic. This paper reviews development of regulations that impose limits for vehicle noise. Chronological development of vehicle noise regulations is presented in order to observe trends in corresponding noise limits and requirements. Required future activities in formulation of new vehicle noise regulations based on vehicle users’ demands, developments and trends in automotive industry and requisites for vehicle weight reduction and cutting the costs of vehicle production are analysed in the paper.