engleski

Natural Frequences of the Combine Harvester Cylinder

The combine harvester cylinder vibrations were measured at grain harvest. The measured vibrations were acceleration amplitudes of the cylinder bearings. Frequency measuring analysis was conducted with fast Fourier transformation (FFT) resulting in the frequency spectrum. The most pronounced were forced vibrations of treshing technological forces (grain cylinder beat force), inertion ones (centrifugal force) and temporary resonance. Position of the resonances was registered by measuring and numerical modelling approved. The used models of the vibration systems were known for seven masses and up to fourteen freedom degrees i.e. fourteen frequences. Even the simplest models provided lower frequences as well as the frequency spectrum (FFT).

combine harvester; cylinder; vibrations; frequency

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