METHODS OF ESTIMATION AND PREDICTION OF SERVICE LIFE OF COMPONENTS AND UNITS OF BASE CHASSISIN FIREFIGHTING VEHICLES
Reliability of rolling stock operational services is an essential condition for their timely arrival and efficiency. Fire trucks (FT) are created on the base chassis of cars and trucks, but unlike them have more severe operating conditions: check with the engine cold, the movement with considerable accelerations and frequent braking fully loaded car, work in all climatic conditions. So ensuring their reliability is an actual problem. The purpose of the study is to establish the methodology of the calculation resource of units and aggregates of FT on the basis of data about failures and performed repairs. In the operational documentation of the FT records of car mileage and engine working in the steady state are kept, and also repairs are performed. A study of various sources was compiled sequence of actions to determine the individual resource components and assemblies using the FT mileage and best practices, conducted appropriate repairs. The methodology involves tabulation of failures in ascending order of the reliability index, determination of the average value of the mileage or time to failure, definition of the confidence interval and determining the probability of failure. As a result there is the possibility of determining vehicle mileage or operating time of the unit to the limit state, taking into account gamma-percent time to failure γ = 80 %, which corresponds to a probability of failure P = 0,8. The described method will allow to predict the maintenance and repairs of the FT based on the actual values of mileage and experience and to plan funds for recovery operations.