The article presents the results of a comparative tests and mathematical modeling for the selection of various units and assemblies of motor vehicles. These results were analyzed for optimal power plant and transmission selection, followed by improvements to develop a vehicle with an up to date electromechanical transmission. The article substantiates the choice of components and assemblies for a 4x4 ATV with an electromechanical transmission.
In modern conditions of market competition leading manufacturers of wheeled vehicles and their components actively introduce new technologies in the process of production of their products. One of the directions of modern automobile industry development is application of new materials, which include polymeric composite materials (PCM). In the given research the analysis of elastic properties of a leaf spring made of application of polymeric composite materials is carried out. In the study the analysis of the construction by finite element (FE) method and the analysis of the results of bench tests are carried out. To carry out the research, the appropriate design was made, the methods of testing of the elastic element under consideration were developed, the composite spring was mathematically simulated for the purpose of its verification and the possibility of its further use. As a result of the work performed, the maximum deflections of the leaf spring under consideration were established when loading the corresponding load in the suspension system of GAZ-2752 "Sobol" car. The executed bench experiment has established he maximum deflection of a spring. Similar values were obtained by the FE-method. These results show that it is impossible to use the leaf spring in the suspension system of a GAZ-2752 car.
BACKGROUND: For transport accessibility in areas with an undeveloped road network, the use of tracked trains that provide low ground pressure is a rational solution. To ensure the mobility of a semi-trailed, unmanned caterpillar train, which can be controlled remotely by a driver-operator or by an automatic unmanned driving system, traffic control laws are needed. AIMS: Ensuring energy efficiency in curve control of a unmanned semi-trailer tracked train for off-road freight transport. METHODS: The methods of simulation mathematical modelling and analytical methods based on the consideration of the quasi-stationary motion of the caterpillar train links are used to derive energy-efficient control laws and determine the mobility performance that can be achieved. RESULTS: Control laws are obtained for two variants of tracked trains: a tracked train with independent drive control of driving wheels and a tracked train with a differential drive scheme of a semi-trailer link. The control laws are designed to improve the energy efficiency of travel which is achieved by rational distribution of traction forces on the driving wheels of the tracked train and use of the regulator which ensures adjustment of the traction on the semi-trailer driving wheels accord-ing to the sign and magnitude of force in the fifth-wheel coupling of the tractor. A block diagram of a governing system of a caterpillar train and a mathematical description of its basic structural components (blocks) are given. Using the developed control laws the theoretical research of curvilinear movement by simulation mathematical modelling is carried out; the comparative analysis of the considered control laws of the semitrailer caterpillar train movement with two transmission variants is given. CONCLUSIONS: The application of the developed caterpillar train motion control laws will enable the vehicle to move unmanned or follow the lead vehicle along a set path with high accuracy of turning manoeuvres and, consequently, will improve the safety of freight transportation.
The article provides a review of models allowing to take into account the viscoelastic properties of springs made using polymer composite materials. The features of solving equations with fractional derivatives that describe the considered models are considered. The equation of the stress-strain state of the composite spring is obtained, which takes into account the rheological properties of the material. A model has been developed in MATLAB / Simulink, which allows calculating composite springs. A composite spring was made and tested, which made it possible to compare the elastic characteristics of the spring obtained as a result of modeling and experiment. The authors of the article determined the scope of such springs in the automotive industry and the direction of improvement of composite springs used in wheeled vehicles.
The article provides a review and analysis of the current state of development of 4x4 ATVs and the scope of the developed ATV, a comparison of ATVs with mechanical and electromechanical transmissions, as well as their technical characteristics. The selection and justification of the design solutions for a 4x4 ATV with an electromechanical transmission are given on the basis of the following electric drive schemes considered in the article: “Electric motor instead of ICE”, “Motor axis”, “Electric motor-half axis”. The general design solutions of the ATV being developed is also presented based on the selected electric drive scheme.
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