Analýza vibrací kardanové hřídele pohonu nákladního automobilu

Abstract

The present dissertation deals with the analysis of the vibration of a truck cardan shaft. The topic of the dissertation is based on the thesis developed at the Department of Machine Parts and Mechanisms in 2018. The aim of this thesis is to answer some questions that arose during the thesis. The original assignment was to describe the effect of the length of the cardan shaft on the vibration manifested. As part of this investigation, a detailed kinematic analysis was carried out, which has been followed up in this thesis. The cause of the shift of the characteristics by π/2, which often introduced ambiguity into the results during the dissertation, was explained. The obtained relationships and graphical waveforms were then used in the analysis of the cardan shaft loading. The analytical methods were used to determine the torque waveforms across the entire cardan shaft, which were then verified using the finite element method. In the next part of the thesis, the analysis examines the conditions under which undesirable vibrations are manifested and which vehicles are most likely to experience vibrations. Besides, attention is also paid to the disturbances that arise.

On the basis of experience from the original work, a relationship describing the dependence of the angles between the shafts β1 and β2 was derived, thanks to which it is possible to find the length of the cardan shaft at which β1=β2 will be valid for a given configuration and bay dimensions, or what angles will be achieved at the selected length.

The mathematical relationships established for the calculation of the cardan shaft load are then used in the simulation of an experiment designed to verify the effect of the cardan shaft on the vibration manifested. The experiment was carried out in the theoretical plane using finite element simulation