Evaluation of the efficiency of the friction tread brake of the diesel motor car

The purpose of the work is to evaluate the efficiency of promising electricity storage systems in the traction power supply system of the above-ground line of the Tashkent metro. The work uses methods of simulation modeling of the interaction of urban electric rolling stock and the traction power supply system with electricity storage devices. The modeling was carried out taking into account the frequency of changes in operating modes of electric rolling stock, including regenerative braking, which affects the energy performance of electricity storage systems. The characteristics of the operation of electricity storage systems, an assessment of the voltage level on the buses of sectioning posts, the duration of episodes of operation in charge and discharge modes, their number and the corresponding total volumes of electricity per day were obtained. The calculation results make it possible to assess the prospects for using electricity storage systems in the operating conditions of the ground part of the Tashkent metro.

Prospects for the application of electricity storage systems on the ground branch of the Tashkent metro

Gayipov,

Baltaev,

Sultonaliyev

et al. 2023

The body of a dynamometer wagon for special technical purposes

Khikmatov,

Baltaev,

Soboleva

et al. 2023

The development of new and improvement of existing railway rolling stock wagons is an urgent task of our time, providing for cost reduction, both in the process of creation and operation, and in the maintenance of the wagon fleet. The purpose of the work is to modernize the body of a dynamometer wagon for special technical purposes using modeling. To determine the loading of the structural elements of a dynamometer wagon, a calculated three-dimensional model of the wagon body was developed, the reinforcement points of the wagon frame were determined. Compression/tensile strength tests of the wagon were performed on a stand for loading the frames of wagons and elements of coupling devices. The stress-strain state of the wagon structure is determined when statically applied longitudinal test loads are applied to it. The test results and the stress-strain state of the design of the prototype wagon, under the action of statically applied longitudinal compressive and tensile test loads, showed that the proposed design of the wagon meets the established strength requirements, while no visible damage and residual deformations were found in the design of the prototype wagon. The developed design of the dynamometer wagon body can be included in both freight and passenger trains, which solves the problem of efficient and safe use of locomotives when operating trains on mountainous sections of railways of the Republic of Uzbekistan.

Influence of wear of friction wedges of model 18-100 trolleys on the lifetime of the comb

Gayipov,

Galimova,

Xurmatov

et al. 2023

The issue of the influence of wear of friction wedges on the wear of the flange thickness of wheel pairs of freight cars operating on the railways of the Republic of Uzbekistan is considered. An analysis of freight car uncouplings during current uncoupling repairs is presented based on malfunctions of the thin flange of the wheel pairs and overestimation/underestimation of the friction wedge relative to the supporting surface of the bolster more than normal. Methods of combinatorial and statistical analysis of source data were used. The parameters of freight car bogies that most influence the wear of the flange of wheel pairs have been studied. Ways to reduce wear on the flange of wheel pairs in operation are considered by tightening the regulatory requirements established when releasing bogies from repair based on the condition of the friction wedges. The results obtained indicate a decrease in wear on the flanges of wheel pairs and an increase in the service life of the wheels of bogies of 18-100 freight cars when following the recommendations of the article on the repair of bogies.