Influence of rotation transmission elements as elastic system for own vibrations

Abstract

At this stage of development of tractor construction increase the power of energy tools contributes to a significant increasing of torque fluctuations of the internal combustion engine. These vibrations are transmitted to the transmission as the elastic torsional vibration shaft of the drive train. Thus, to ensure an adequate level of dynamic stresses is necessary when designing machines to solve the problem of vibrations of motor-transmission system. In addition, despite the current state of design and drafting power tools, there is rotation of the shaft, located on them the masses around the axes, which do not coincide with the central axes of inertia of the system. This rotation occurs as non-compliance with the technological process of manufacturing and in considerable wear supports these shafts. Separately, the issue is consider from the point of view of formation of vibration acceleration, impact on the natural frequencies and forms of oscillations of the shaft, their critical speed and resonance characteristics. Therefore, the questions of changing the natural oscillations of transmission settings as the elastic system, which revolves around an axis close to the main axis of inertia of the system, are investigate in the article. For the analysis of work the elastic shaft in the absence of alignment of the central axis of inertia and the rotation axis of the system, developed by a discrete model of a system with interconnected inertia less elastic bonds. Consider the case where system is not fix at its free movement has five degrees of freedom. At the same time, to explore the most interesting are the only two forms of its own torsional vibrations: symmetric and antisymmetric in the longitudinal plane of the system. The theoretical modeling determined that the increase in speed of the system about an axis that passes through the central axis of inertia increases the natural vibration frequencies of the first and the second tone. Furthermore, the formation of torsional vibrations in pliable elastic structure also increases frequencies of the system for both the first and second tones.