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Simulation Modeling of Wheeled Vehicle Dynamics on the Stand "Roller"
Engineering Education # 04, April 2014
DOI: 10.7463/0414.0707918
The article substantiates an urgency to develop the theoretically grounded techniques for the bench tests of automotive engineering. It introduces a new principle to simulate the load operating conditions with moving wheeled vehicle in outdoor environment at the bench «Roller. A mathematical model of wheeled vehicle dynamics both at the bench and on the road has been developed. The mathematical simulation allows us to conduct the theoretical researches of straight-line dynamics of a single wheel on the hard non-deformable support base with different characteristics. The results of mathematical simulation proved the efficiency of the proposed approach and the created mathematical model. Further research trends based on this principle are justified.
77-30569/346642 Experimental research of loading characteristics of a two-chamber pneumo-hydraulic spring of a suspension bracket of new generation automobile platforms of average and big load-carrying capacities
Engineering Education # 12, December 2011
Along with widely used theoretical methods of research of internal dynamics with use of imitating mathematical simulation, only natural tests can provide the final conclusion about working capacity of a design and correctness of a choice of options. Natural tests also allow to verify imitating mathematical models that is to estimate their adequacy and accuracy. The mathematical model of a two-volume pneumo-hydraulic spring (PHS) suspension brackets of new generation automobile platforms of average and big load-carrying capacity was developed. Benchmark tests of the natural sample of such PHS to check the adequacy of the developed model and research of behavior of a design were conducted at various kinds of loading. It was shown that the mathematical model described the processes, proceeding in a design two-volume PHS, precisely enough.
77-30569/346660 Design procedure of characteristics of a pneumo-hydraulic operated suspension bracket with a two-level damping of multi-wheeled vehicles
Engineering Education # 01, January 2012
Required level of a damping of multi-basic oscillatory system depends on character of external indignation. In connection with this, regulation of the characteristic of damping, depending on operating modes of amortization systems, is one of the basic directions of their further improvement. This direction for improvement of quality of suspension systems of multi-wheeled vehicles (MWV) with quantity of axes more than three is rather perspective. Mathematical model and design procedure of design parameters of a pneumo-hydraulic spring with counter-pressure and two-level damping were developed for operated suspension brackets of MWV. The example of calculation of spring for suspension bracket of the MWV with the wheel formula 8x8 in the lump of 60 tons was included in this article.
77-30569/293578 Technique of selection of characteristics of controlled suspension bracket with two levels of damping multi-wheeled vehicles
Engineering Education # 02, February 2012
The required level of damping a multi-basic oscillatory system depends on the character of external disturbance. In connection with this, regulation of the characteristics of damping, depending on operating modes of amortization systems, is one of the basic directions of their further improvement. This direction for improving the quality of suspension systems in multi-wheeled vehicles (MWV) with the quantity of axes more than three is fairly promising. The authors show that for multi-wheeled vehicles, due to a narrow-band low-frequency spectrum of fluctuations of the case, the characteristics of damping which provides automatic reception in the zone of resonance of attenuation factor nearly 
ψ =0,4 … 0,6 on longitudinal-angular and vertical fluctuations irrespective of the weight of object and change of restoring force, was desirable. At the same time in the above-resonance zone, the damping level should be reduced, which leads to a significant decrease of vibro-load of the MWV. This leads to the necessity of creation of a suspension bracket of variable structure where there is an automatic change of the damping level depending on the kind of road roughness impact on the MWV. Two levels are enough: the basic (high), and low which joins only in the case of high-frequency road profile influence. The design procedure of elastic and damping characteristics of a suspension bracket with two-level damping was developed. The example of calculation for the MWV with the wheel formula 8x8 in the lump of 60 tons was included in this article.
77-30569/282533 Synthesis of control traction motor for individual drive wheeled vehicle
Engineering Education # 12, December 2011
The authors give a detailed description of car electromechanical transmission control at the individual distribution of power in the wheels, the main essence of which is proportional to the relative distribution of the normal load to be carried by the wheel. The law is adapted for two versions of drive control: "angular velocity" and "torque". Effectiveness of the law is proved by the results of mathematical simulation of car motion with 8×8 wheel formula on the basis of non-deformable reference to two cases: upgrading (with “angular velocity” control) and curvilinear motion with a fixed radius (with “torque” control). The directions of future research is the need to study car movement with the proposed transmission control in a wide range of external influences ("mixed doubles" motion, acceleration, motion on a deformable substructure, etc.), and also in comparison with the results of movement with traditional transmission patterns.
Modeling of viscoelastic properties and mechanical behavior of polymeric composite leaf springs
Engineering Education # 07, July 2011
The method of hysteretic damping systems modeling using fractional calculus is analysed in this article. Mathematical model of mechanical viscoelastic behavior of composite leaf spring with polymer interleaves is described. The properties of the model is analysed in the article, the calculation of ride comfort parameters of the vehicle with such leaf springs is made.
An application of polymeric composite materials in the suspension systems of wheeled vehicles
Engineering Education # 06, June 2011
The suspension system dynamics of special all-road vehicles with low pressure tires is analysed in this article and concluded an opportunity of decrising of the required damping measure. The optimal parameter of linear-viscous damping in the suspension system of the special all-road vehicle is calculated while it drives along different roads throughout the range of possible speeds. Russian and foreign developer’s experience of polymeric composite material’s and other polymeric material’s application in the suspension systems of the vehicles is analysed in this article.
Method of definition of average speed of rectilinear movement of a tracked vehicle at a design stage
Engineering Education # 04, April 2010
The article describes a new analytical dependence for definition of average speed of rectilinear motion of a caterpillar with restrictions on cushioning system. The peculiarity of this dependence consists in taqking into account the hyperbolic sector of speed ability. It is shown that formula usage allows to receive a more authentic estimation of the average speed of a caterpillar, which is especially important for definition of loading and durability of suspension members elements.
Mobility increase sections articulated tracked vehicle management of a corner of folding of sections in a vertical plane during movement
Engineering Education # 01, January 2010
In article the algorithm of management by a corner of folding of sections articulated tracked vehicle which use raises smoothness of a course of the car at the expense of decrease in amplitudes of longitudinal-angular fluctuations section is presented.
 
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