Vasilyev A. V. IMPROVING THE EFFICIENCY AND RELIABILITY OF A DIESEL ENGINE BY PROFILING DYNAMICALLY CONFIGURED CAMS
http://dx.doi.org/10.15688/jvolsu10.2014.4.9
Vasilyev Aleksandr Viktorovich
Doctor of Technical Sciences, Professor, Head of the Department of Car-and-Tractor Engines,
Volgograd State Technical University
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Prosp. Lenina, 28, 400131 Volgograd, Russian Federation
Abstract. The article presents the results of the use of a numerical method of forming the profile cam timing engine for profiling dynamically configured cams. They are characterized by the presence of two maxima in the plot of the positive acceleration of the follower, which allows to obtain, under certain conditions, the dynamic damping of the oscillations arising in the elastic valve. This, in turn, contributes to maintaining the working capacity of the valve actuator at high speed of cam shaft, improving the efficiency and reliability of the timing mechanism. The article contains the comparative characteristics of the two dynamically configuredgovernmental cams, profiled by the numerical method, and the serial cam diesel CVN/16, profiled by well-known Kurtz method. It is shown that the dynamic adjustment of the cam valve actuator using a generalized numerical step-by-step profiling method, having a number of advantages over known methods, can significantly reduce the intensity of oscillatory processes in the actuator valve on the operating mode compared with an unconfigured switch. Mathematical modeling of dynamics was carried out on the basis of 9-mass adequate dynamic model identified from experimental data. Improved di-namechecked qualities of the actuator using a custom cam is also observed when the frequency of rotation, the smaller the settlement. The theoretical studies revealed that the dynamics on the construction of the cam can be significantly distorted by the increase in thermal gap that is accompanied by a sharp increase in the intensity of oscillations in the drive. This method can be recommended for engines that operate primarily on a single high-speed mode while ensuring a constant value of the thermal gap. Dynamically configured cam, developed on the basis of step-by-step numerical method for the synthesis of the law of motion of the follower is protected by the patent of the Russian Federation.
Key words: cam, profiling, valve actuator, vibrations, dynamics, dynamic configuration, acceleration of follower, timing mechanism, step-by-step numerical method, mathematical modeling.
IMPROVING THE EFFICIENCY AND RELIABILITY OF A DIESEL ENGINE BY PROFILING DYNAMICALLY CONFIGURED CAMS by Vasilyev A. V. is licensed under a Creative Commons Attribution 4.0 International License.
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