Parameter Optimization of the Wheel Brake of a Timber Car with the Objective of Brake Force Maximization

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634.0.37

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Abstract

The paper treats the questions of optimization of brake subsystem of timber cars providing air pressure supply to the frictional surfaces of the brake gear in the course of braking for finding out the maximum of brake force. For cooling of the drum type brake of timber cars, carrying out products of wear out from a friction zone, it was recommended to blow the compressed air on their frictional surfaces. It is established that for increasing of effectiveness and stability factors of the brake gear the compressed air should be blown to a friction zone before braking process that is before the brake blocks adjoin with the brake drum. In this case, the process of braking will proceed by more cleared frictional surfaces. It is established that supply of the compressed air before the braking process led to increasing of the brake force for 14 % which was determined at the experimental wheel of the track MMZ-554 ZIL during the experiment at the computerized one-framed braking stand with the luxury screen 28", 15T/2* by 11kW/44803, mod. 7515 – M 11FP NORD + 102561, of Muller-BEN company, ser. No. 330. After the experiment the statistical analysis of the obtained data was done and the next indicators were received: average value of output size, with the basic mistake; average square deviation; experience accuracy; reliability of the average value. By means of the mathematical MathCAD package the regression analysis on the obtained experimental data was made. After derivation of the regression equation and checking of its adequacy there was a problem of determination of optimum values of parameters and characteristics of a brake subsystem which provide the maximum value of brake force. The diagram of dependence of brake force on the inlets diameters and pressure of delivery air is received. The calculations showed that the maximum brake force is equal 10400 N, with the inlets diameters of 5,9 mm and pressure of delivery air – 0,6 MPas. Therefore, at the further improvement of the brake gear of the drum-block type by supplying compressed air at its frictional surfaces during the braking process, that is, before adjoining brake blocks with a brake drum, it is possible to recommend the received optimum parameters and characteristics of a brake subsystem.

Authors

D.G. Myasishchev, Doctor of Engineering, Professor, A.S. Vashutkin, Candidate of Engineering, Associate Professor, A.M. Shvetsov, Postgraduate Student

Affiliation

Northern (Arctic) Federal University named after M. V. Lomonosov ::: Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia; e-mail: d.myasishchev@narfu.ru

Keywords

compressed air, optimization, the regression equation, experiment.

References

1. Vashutkin A.S. Uluchshenie jekspluatacionnyh svojstv tormoznoj sistemy lesotransportnyh mashin: dis. … kand. techn. nauk [Improvement of Operational Properties of the Brake System of Timber Cars: PhD in Techn. Sci. Diss. Abs.]. Arkhangelsk, 2012. 139 p. 2. Myasishchev D.G., Vashutkin A.S., Shvetsov A.M. Postanovka zadach issledovanija podachi szhatogo vozduha na frikcionnye poverhnosti tormoznogo mehanizma s uchetom jeffekta sopla Lavalja [The Task Definition of Researching of Air Pressure Supply to the Brake Gear Friction Surfaces with the Convergent-Divergent Nozzle Effect]. Izv. vissh. ucheb. zavedeniy. Lesnoi zhurnal, 2014, no. 5, pp. 107–112.