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The spatial model of an all-terrain vehicle with pneumohydraulic suspensions, which allowed executing the estimation of a vibration loading construction taking into account large motions of solid bodies, exact kinematic of suspension elements and features of their mounting on a vehicle, is built. Comparison of charts of power spectral density of ve...
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... longitudinally located engine with a gear-box is set on a frame on two front and two back rubber mountings having identical resilient and damping descriptions. For a calculation scheme, shown in Figure 1, all bodies are accepted as absolutely solid. The operation of the transmission is not taken into account; therefore, a transfer box and cardan shafts are absent from a model. ...
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The goal of this article is to design a navigation algorithm to improve the capabilities of an all-terrain unmanned ground vehicle by optimizing its configuration (the angles between its legs and its body) for a given track profile function. The track profile function can be defined either by numerical equations or by points. The angles between the...
Citations
... The development of various industries [1][2][3][4][5][6][7][8][9][10][11][12][13] requires solving technological production problems [14][15][16][17][18][19][20][21][22][23][24][25][26], which contribute to improving the quality of products [27][28][29][30][31][32][33][34][35][36][37][38][39]. As for the oil and gas industry in Russia, its development is determined by the modernization of the old and the commissioning of new pipelines. ...
The paper analyzes the problems of exploitation of pipe outlets for the oil and gas industry and describes the special design of the outlet’s vane, which allows to extend its service life. However, this special shape of the vane requires new manufacturing technologies. The paper lists the technical requirements for the finished model of the outlet and the method of its manufacture. Based on them, an analysis was carried out, and has been proposed the application of additive technologies for the manufacture of a steel pipe outlet with the vane, namely, the method of Selective Laser Melting (SLM). The advantages and particularities of the method’s application are described, as well as the stages of the manufacturing process for manufacturing an outlet with a special shape of the vane.
... In case of traditional control, the driver fully controls all DVROE elements. Traditional control systems do not change the nature of the controlling effect of the driver and they can be broken down into the following three types (Gorobtsov et al., 2017): ...
The paper puts forward six control paradigms depending on the type of relations between subsystems in the driver–vehicle–road–objects–environment system. Primary issues of transition to the highest automation levels are listed. They are legal, social, and technological ones. The authors suggest a number of practical recommendations to solve issues of transition to autonomous control.
... 3. In the middle of the 20 th century, vehicles became more widely spread (at a different pace in different countries), and controls simplified which was promoted by an invention of a hydraulic and pneumatic braking drive with a single-pedal control, an automated and automatic transmission, and a steering hydraulic booster (Gorobtsov et al., 2017;Maksimychev et al.,2016;Ostroukh et al., 2016). It became obvious that it was much simpler and less costly to have a courier mastering driving a vehicle than provide a driver mechanic for each courier. ...
For the last 15 years, the assessment of consumer properties of products at the automobile market has been considering multimedia system specifics instead of dynamic properties or design safety. Is this new global trend anomalous or is this another step towards autonomous control? To answer this question, the authors analyzed the evolutionary development of automobile control systems where adaptation, automation and synthesis were defined as three primary trends. The authors determined several stages of technical and man-made adaptation. Some associated issues are formulated, in particular, an inverse effect of implementing vehicles with automatic control.
The influence of the stiffness of the rear leaf spring on the vibration loading of the van is estimated using a spatial model of its dynamic. The new model of spatial oscillations of the van with all-metal body taking into account the dynamics of the movement by road microprofile, nonlinearities of dynamic hysteresis characteristics of elements of the vibroprotective systems and tires, taking into account the deformation of frame and body, is built. The calculations were carried out when moving the van in two weight states: empty and full weight. For analysis of the vibration loading of the van, the spectrums of vertical accelerations at several points of the van construction were obtained. All calculations were performed in the “FRUND” programmatic system. Based on the calculation results, the rational stiffness parameters of the rear spring are proposed. The results obtained in the course of calculations were constructively realized by removing the fourth and sixth leaves from the standard leaf rear spring. This also led to a significant reduction in the weight of the rear leaf spring.
The article is devoted to the choice of rational stiffness parameters of the joints in the suspension levers in the vehicle cabin. The method of formation of cabins dynamic models at their inclusion in spatial dynamic models of vehicles is offered and programmatically realized. In the known methods, the attachment of the cabin to the frame is not taken into account or simulated using linear springs with parallel inclusion of linear dampers or without them. The proposed method deals with the geometric features of the lever guide apparatus, the location of shock absorbers and elastic elements, the presence of a stabilizer in the cabin suspension. In addition, the elastic-damping properties of the mounting parts of the cabin suspension elements are considered. This made it possible, even at the design stage, to investigate the effect of the stabilizer’s torsional stiffness and the stiffness of the cabin suspension joints on the vibration loading of the cabin and the driver’s seat, which are noticeable at frequencies above 7 Hz.
New multilink models of leaf spring suspensions take into account a number of important features. First, we are talking about the features of the kinematics of suspension elements in the design scheme of the vehicle. Their account is provided by application of the differential equations of large displacements of bodies and also modeling of a leaf spring in the form of the links, connected by joints. Secondly, the nonlinearity of the hysteresis dynamic characteristics of the suspension is taken into account, with the help of which the dynamic stiffness of the leaf spring is considered. The dynamic stiffness is depending from the dry friction between spring leafs and the amplitudes of cyclic oscillations with a random external road forcing. Thirdly, the accuracy of the installation scheme of the leaf spring in the vehicle suspension is considered. It takes into account the peculiarities of fixing the leaf spring and their impact on the change in stiffness.
