Analysis of the dynamic model of a flax stem strip fluffer

   Obtaining a high-quality flax press depends on the work of the working tools of the flax stem strip fluffer and its design features. To improve the design of the unit, the authors proposed to consider a flax stem strip fluffer as a model for the functioning of dynamic systems using the principle of system analysis.

   The study purpose was to develop a dynamic model of a flax stem strip fluffer as a complex dynamic system.

   The methodology involved a comparative analysis of the effect of the structural parameters of the microrelief field on the oscillations of the fluffer in the horizontal and longitudinal-vertical planes. The authors obtained a dynamic model of the fluffer and carried out an in-depth analysis of its dynamics in field conditions. Strain gauge measurements were performed on flax stem strips that had been stored for some time at the working speed of the developed experimental unit, ranging from 2.2 to 5.0 m/s. Statistical analysis of the input surface irregularities Z(t) showed that this process obeys a normal distribution law and has a low-frequency character: ωс = 0 to 5 s⁻¹. Moreover, the process of changing the input impacts Z(t) causes horizontal-longitudinal and vertical-longitudinal oscillations of the fluffer, which alters the depth of engagement of the teeth ends of the fluffing drum with the flax surface and affects the output quality parameters. Devices were developed to reduce the influence of soil irregularities Z(t) on quality indicators by increasing the smoothness of the fluffer operation. As a result, the authors manufactured a flax stem strip fluffer having the considered units. Testing the fluffing device with improved smoothness over an area of 22 hectares at speeds of 4.2 to 5.5 m/s demonstrated a 27 % increase in process reliability and improvements in quality indicators (fluffing completeness – 98.8 %, an increase in stem strip stretch – 1.3 %, an increase in retting unevenness of stem strip – 5.2 %).

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