Usage of nonequilibrium modes method in passenger car bodies test for their thermal condition estimation and monitoring

Introduction. The thermal performance of the passenger car body is strictly regulated, their deviation from the norm leads to a significant excess energy consumption, which is reflected in an increase in the cost of passenger transportation. Over time, due to different operating conditions and ranges, the value of the heat transfer coefficient becomes individual for each production carriage body and heat losses through carriage body guards. The purpose of the article is to develop a new methodological approach based on the heat transfer coefficient of enclosing structures, which would enable to assess the thermal condition of the carriage body with less labor intensity, more quickly and both during the factory production of the car and after its commissioning.

Materials and methods. Calculations of the values of the heat transfer average coefficient of the enclosing structures of the carriage bodies at train stand were performed based on the results of thermal engineering tests of passenger carriage bodies using the standardised method of equilibrium modes, as well as the method of nonequilibrium modes.

Results. Comparison of the calculated values of the heat transfer average coefficient bodies of four passenger carriage bodies, obtained as a result of a series of thermal engineering tests using a standardised method with similar values calculated according to the method of nonequilibrium modes, did not exceed 3%.

Discussion and conclusion. When conducting thermal engineering tests of passenger carriage bodies based on the method of nonequilibrium modes, the value of the average heat transfer coefficient of the enclosing structures of the car could be determined in production conditions in 11 h without compromising accuracy, which is 7–8 times faster than the currently used standardised method. The use of nonequilibrium mode methods enables to organise control of the normative thermal technical indicator of the carriage body after car commissioning throughout the life cycle, which gives opportunities for planning the volume of car fleet energy consumption.

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