About the article
K.V. FOMIN, Dr. Sc.
In the article a model of the moment of resistance is offered which takes into account periodical character of interaction of cutters with a peat deposit, random conditions and modes of machine operation, influence of errors of blade angles on the cutter body and their height, connected with inaccuracy of manufacturing and assembly of an executive body as well as with wear or irreversible deformations of cutting elements. On its basis expressions for calculation of spectral density of the torque are received and influence of errors on its frequency properties is investigated. Deviation of geometrical parameters from the «ideal» values leads to appearance of additional components at frequencies multiple of the cutter angular velocity in the spectral momentum density. Their magnitude is proportional to the total error of blade placement by angle, as well as proportional to the total value of the ratio of blade height errors to feed rate. These factors should be taken into account when working with low feeds and working tools with a large number of cutting elements; when calculating dynamic loads in the elements of a structure if their natural frequencies are the same or close to the cutter angular velocity or multiple of it.
peat milling unit, cutter, blade location error, cutter height error, resistance torque, load model, spectral density.