A method for evaluating wheelset repair of rail transit vehicles

Abstract

The invention relates to an evaluation method for turning repairing of a rail and transit vehicle. The method comprises steps of firstly establishing a frequency corresponding relation shown in the description between the polygonal order of a wheel and the frequency spectrum of noise in the vehicle; measuring noise in a carriage; carrying out frequency spectrum analysis in the carriage, and judging the non-circular grade of the wheel, wherein when the difference deltaL of the first peak value sound pressure level of the noise signal frequency spectrum and an average value is less than 15dB, the non-circular grade is 3, when the deltaL is between 15dB and 25dB, the non-circular grade is 2 and when the deltaL exceeds 25Db, the non-circular grade is 1; and evaluating the turning repairing, wherein the evaluation standard is that when the grade is 1, and the noise A weighting equivalent sound pressure level is larger than or equal to 75dBA, judging the repairing as the turning repairing, when the grade is 2 and the noise A weighting equivalent sound pressure level is larger than or equal to 80dBA, judging the repairing as the turning repairing and when the grade is 2 or the noise A weighting equivalent sound pressure level in the vehicle on a steering rack is smaller than 75dBA, judging to maintain the preset status. According to the invention, a wheel 'turning repairing' judgment limiting value with onsite operability is made; basis is provided for evaluation of the wheel turning repairing; two onsite problems which need to be solved immediately in the high-speed wheel turning repairing are solved; and the method has remarkable economical value.

Description

Technical field[0001]The invention relates to an assessment method for wheelset repair of rail transit vehicles, in particular to an assessment method based on noise monitoring in a vehicle and wheel polygon feature repair, which is applied to the field of rail transit high-speed EMU vehicles.Background technique[0002]With the increasing development of high-speed railway networks, high-speed EMUs have broad application prospects, and the high-strength and high-density operation of bogies at long distances is the core component of the entire EMU, and the wheelset is in the bogie The components directly in contact with the rail are subject to complex forces, so damages such as wheel flange wear, wheel diameter difference, and tread peeling are extremely easy to occur, which have an important impact on the driving safety, riding comfort and rail life of rail vehicles. The wheel set needs to be repaired to maintain the normal geometric parameters of the wheel set.[0003]According to the ...

AI Technical Summary

Problems solved by technology

However, there are two problems in the process of repairing the problematic wheels: (1) due to the circumferential non-circular test of the wheels one by one, and then judging the polygonal characteristics of the wheels, the actual site conditions of a large number of operating trains and moving depots in the railway bureau are limited. Therefore, the operation and maintenance of high-speed trains need a method for quickly judging the polygonal characteristics of wheels

(2) Considering the limited resources of the turning machine and the time-consuming repair of the wheels, and frequent turning of the wheels will accelerate the wear of the wheels to the limit, resulting in a sharp increase in the operating costs of high-speed trains. Under the premise of high-order non-circular influence, the "turning repair" judgment is carried out for wheels with non-circular wheels

Images