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The article discusses the operation of the grate proposed by the authors with grates made of composite material, with a polyamide matrix and a filler of basalt fibre. Experimental grates are mounted on elastic rubber supports with non-linear rigidity. On the basis of finite element modelling, the analysis of the forms and natural frequencies of free oscillations of the grate of cotton cleaner from large litter was carried out. It is shown that the first 12 natural frequencies are located in a narrow range from 2.579 to 2.692 Hz. This is due to the design features of the grate. It is shown that during operation the grate performs forced oscillations with frequencies 45…75 Hz.

DETERMINATION OF NATURAL FREQUENCIES AND FORMS OF FREE VIBRATIONS OF THE GRATE OF THE RAW COTTON CLEANER