This paper presents electric brake system parameters determination problem on the multiaxial wheel vehicle with traction electric drive engineering stage. Brake resistors power determination method using vehicle motion imitational mathematical modeling is proposed.

Annotation The paper considers general approaches to the design and calculation of the characteristics of hydropneumatic dampers that can be used in the suspensions of mobile cars. It is paid particular attention to the determination of the main hydraulic characteristics of the flow part of the damper, including a direct-acting belt valve, based on numerical simulation.

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BACKGROUND: Ensuring transport accessibility of arctic zones of the RF, according to the strategy of social and economic development of the Russian Federation until 2030, is an important and relevant objective. AIMS: The article contains the results of the study of motion of the 6WD snow and swamp-going vehicle with traction electric drive, developed at the Wheeled vehicles department of Bauman MSTU as part of development of snow-going vehicles line-up for the sake of improvement of transport accessibility for people living in arctic zone of the RF. METHODS: On the basis of the RM 650-2 6X4 all-terrain vehicle, the state-of-the-art electric snow- and swamp-going vehicle with a light-weight welded frame, an electric power unit, a lithium battery as a power-supply source and electromechanical transmission was designed. The vehicle equipped with systems of control, cooling and lighting as well as sensors and measuring complexes. Studies were carried out with various vehicle operation modes (on direct gear with current limit, without current limit and on low gear). Soil road and prepared cross-country terrain were used as a profiled track. RESULTS: The time-domain diagrams of traction electric drive operation and the vehicle dynamic characteristics were obtained as the study results. CONCLUSIONS: The obtained values and characteristics point at high level of vehicle power equipment and at prospects of designs, used in the snow-and swamp-going vehicle. The study results can be used for modernization of existing vehicles and for development of high-technology machinery, based on electric power unit.

Вопросы исследования внутренней динамики пневмогидравлических устройств яв-ляются весьма актуальными. Особенно важным является исследование теплонагру-женности. Применяемые в настоящее время методики математического моделирова-ния, созданные на базе метода конечных элементов, требуют индивидуального под-бора параметров для каждого устройства. Используемая в статье модель учета теплонагруженности, основанная на методе конечных разностей Шмидта, позволяет проводить исследование пневмогидравлических устройств различных конструкций с минимальными предварительными затратами времени. Приведены результаты ис-следования внутренней динамики работы таких устройств. Представлены результаты имитационного моделирования и стендовых испытаний пневмогидравлических рес-сор колесной машины промежуточной весовой категории и гусеничной машины лег-кой весовой категории на тепловую нагруженность. Показана высокая адекватность математической модели, созданной в среде Simulink/Simscape.Ключевые слова: пневмогидравлические рессоры, плавность хода, блок учета тепло-нагруженности, метод конечных разностей Шмидта, среда Simulink/Simscape, библио-тека SimHydraulics.Internal dynamics of hydro-pneumatic devices is an important area for research, with thermal loading being of particular relevance. Currently used methods of mathematical modeling based on the finite element method require individual selection options for each device. In this paper, the authors use thermal loading model based on the Schmidt finite difference method. It can be used to study hydro-pneumatic devices of various designs with minimal preliminary time required. The results of the study of internal dynamics of such hydro-pneumatic devices are presented. These include the results of simulation and bench testing of hydro-pneumatic suspensions of a wheeled and a tracked vehicle of the light weight class for thermal loading. The high reliability of the mathematical model developed in the Simulink/Simscape environment is demonstrated.