The article discusses one of the options to reduce the electricity consumption for the carry out acceptance of post-repair tests of traction electric machines. Heating tests of traction electric machines at the mutual load stand are the most energy-intensive part of the entire test program. Energy consumption for this type of test can be reduced, for this, an analysis of thermal processes in the windings of traction electric machines during their heating test was given. The energy efficiency coefficient of the mutual load system is formulated. The energy efficiency coefficient for the traction electric machine NB-406 is calculated. The calculation results showed that with an increase in the test current by 30%, the total losses in the motor windings decrease by about one and a half times, while the test time decreases by almost three times. An increase in test current and a decrease in test time do not reduce the quality of the test, and the results obtained. A methodology for assessing the energy efficiency of heating tests is proposed. It can be applied at test sites of depots, as well as repair plants. This will reduce the material costs of testing, without compromising the quality of the tests themselves.

The ripple analysis of the input current of the commutator of the brushless DC motor (BLDC) is performed and their influence on the gain and sensitivity of the control system is established. Methods are proposed for reducing the influence of pulsations on the dynamics of processes in a current loop. Discrete transfer functions of a closed current loop are obtained with and without consideration of the influence of counter-EMF motor, which allowed us to propose a method of stabilizing the rate of increase of the input current of the switch. The implementation of this method allows to increase the working life of the battery. The areas of subharmonic stability of the gas turbine engine launch system (GTE) of the helicopter with BLDC were established. Refe rences 8, figures 4, table 1.

Currently, there are a number of approaches to learning to shoot small arms. The main ones are: the classic method of training shooters and the modern method of training shooters using innovative technical means of training. In order to study the effect of using a laser shooting simulator in the educational process in comparison with the classical method of training, an experimental study was conducted. The experimental study was conducted with 9-mm Makarov pistols with two controlled groups of servicemen, who have approximately the same level of fire training, but each group was trained in different training methods. The first group learned the technique of firing a pistol using an interactive laser shooting range "Ruby" under the guidance of a fire training instructor. The second group trained under the guidance of a teacher according to the classical method, using training pistols. After the end of each stage of preparation, control shootings were carried out. Control firing with groups was carried out in the multimedia interactive shooting range "Ingul" for combat weapons. The results of the shooting show that the number of unsatisfactory grades of the first group was 2.5 times less than in the second group, which studied according to standard methods. The rest of the evaluation indicators are approximately the same and the difference between them is insignificant. Such a large difference in unsatisfactory assessments is explained by the fact that the first group at the initial stage of training saw the visual results of their shooting and had the opportunity to correct errors in shooting technique during training. Such timely correction of shooting technique errors with visual display of shooting results in real time and repetition of the exercise with information about the number of hits and misses forms solid skills of high-speed shooting. This is evidenced by twice as many excellent scores obtained by the first group comparing to the second group during the control shootings in the second stage of the experiment. Thus, the study showed that the use of modern technical learning tools based on interactive multimedia technologies increases the positive results of shooting by 15 - 20% and allows: ‒ increasing the number of students in the school by 1.5 times; ‒ reducing the time for training shooters by 2 times, ‒ reducing the consumption of ammunition to perform exercises of initial and combat shooting by 2.5 times.

The review of methods of post-repair tests of traction asynchronous motors under conditions of locomotive depot is carried out.The necessity of introducing special stands for post-repair tests is shown in order to improve their quality, reduce the number of failures of service equipment, improve safety of the railway transport. Let’s consider a question of power supply of the research asynchronous engine in wide frequency range and also a possibility of creation of the universal stand for testing important asynchronous engines of the electrorolling stock. Survey of possible versions of the scheme mutual loadings of asynchronous electrical machines which can be used for testing traction asynchronous engines of the rolling stock is executed. Such systems can be constructed both with use of the static converter of frequency, and without it. The given short characteristic of each alternative, certain advantages and shortcomings of each of system options. It is shown that systems with use of static converters of frequency differ in high power efficiency, allow to carry out tests in the wide frequency range of power supply, however have higher prime cost. Schemes without converters of frequency differ in smaller power efficiency, impossibility to carry out tests in the wide range of frequency of power supply, high level of consumption of reactive power . The results of the carried-out analysis can be used when choosing rational option of a system mutual loadings of asynchronous electric motors which will differ in higher functionality and power efficiency. Use of such systems will allow to lower capital expenditure for creation new and modernization of traction electrical machines that exist at the station for test.