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Andreev
Features of teaching students the basics of mathematical modeling of technical systems on the example of hydromechanical devices
Engineering Bulletin # 10, October 2015 УДК: 6282 The paper presents a methodology of training engineering students to mathematical modeling on the example of the hydromechanical device. Author, based on management's experience course project for the course "Dynamics and regulation of hydraulic and Pnevmosilatems" and the exchange of scientific and research work of students finds necessarysti gradual feed at training to mathematical modeling. Dismantled example of solving the problem, which allows you to illustrate the main methods of creating mathematical models, set up a system of ordinary differential equations, consider the characteristics of their numerical solution. Presented by the transition from mathematicscal expressions to the block diagram. As a result of this method of training a student is ready for independent writing mathematical models is simple hydrotion systems.
A control system for an adaptive hydropneumatic spring of a wheel machine with a variable elastic characteristic
Engineering Education # 11, November 2013 DOI: 10.7463/1113.0645542 The paper presents a control algorithm for an adaptive hydropneumatic spring with smooth changes in the elastic characteristic during the impact of various kinds of dynamic and kinematic disturbances. Analysis of the control object, which allowed to propose a common structure of the automatic control system, was performed. Particular attention was paid to description of control principles inherent to the computing device; the main constraints in the synthesis of the desired elastic properties were also emphasized. Basic options for controlling electrohydraulic equipment, which can be used in the control system, were described; their brief comparison was conducted. The final part of the article demonstrated working capacity of the developed algorithm by testing it on a mathematical model of a hydropneumatic spring. The authors draw a conclusion that the developed control method has several advantages over traditional control methods and could be implemented, using a hardware base available for the domestic industry.
Development of an adaptive law of relay control of threelevel damping of elastic damping elements of multiwheeled vehicles’ suspension
Engineering Education # 09, September 2013 DOI: 10.7463/0913.0567756 The required level of damping a multisupporting oscillatory system, as it is known, depends on the nature of the external impact. In this case, regulation of damping characteristics depending on the operation mode of depreciation systems is one of the main directions of further improvements. Direction of increasing the quality of primary control systems for suspension of multiwheeled vehicles (MWV) with the number of axes more than three appears to be very promising. A mathematical model and calculation methodology of design parameters of a pneumohydraulic cushion with backpressure and threelevel damping for controlled suspensions of multiaxis chassis were developed. An example of calculation of a cushion for MWV suspension with a 8x8 wheel formula and total mass of 60 tons is given. The adaptive law of relay control of MWV suspension system, namely the “inertial damper” adaptive law, was developed with the use of fuzzy logic methods.



