Review article

When evaluating the conditions under which decisions have to be made in the bus technical operation system, it is necessary to consider factors that were unknown at the time of the bus design preparation or uncertain factors of the external environment, which arise during operation of buses at different stages of its service life. These include the tightening of regulatory requirements for comfort, structure and environment safety. At present, as a result of the increased impact of the external social environment on the assessment of the bus operation quality and the need to implement the achievements of the scientific and technical process on timely basis in ensuring the passenger transport safety, the importance of these factors has significantly increased and is becoming apparent during one service life of buses. A comprehensive indicator for assessing the impact of environmental activity on the bus life is the efficiency preservation factor (EPF). Therefore, the development of methods and mathematical models that reliably determine and predict the value of the EPF of buses for different operating conditions is a pressing scientific and technical problem, and its solution is demanded by practice. The article presents a model for assessing the EPF of buses, which allows solving problems according to several relevant efficiency criteria, namely, reliability, structural and environmental safety, operating costs.