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The work presents these elements of movement which can be determined through the analysis of film shots. A picture of movement can be made on the basis of deformations of walls which limit a "cuboid" of a corn-field and of: 1 - wave front velocity caused by the work of a reel cutting bar →Vf and ←Vf 2 - displacement velocity of cut material → (+) Wₖ and → (-)Wₖ , 3 - "giroscope" vectorᶻ → F, 4 - moment Ωᴸ and angular velocity → ꞷ which accompany rotation about a fixed point, 5 - the way of the stalk which is placed at the edge of the auger as well as the way of its falling on a reaping unit, 6 - velocity of the mean value →z₁ of the displacement of the material in a gap. The work characterizes all these elements which decide about the strawy centre motion, and which could be estimated on the basis of film shots. The work also given an example of distributions of contact points in a grid. This example was obtained with an optical method.
This is an important issue for the evaluation of behaviour of the wheat mass during the harvest. A stem developes natural asymmetries, which determine the character of its movement during the interaction with the pickup reel and knife. The dynamics of the bending line recorded on a film allows for assessing, provided the exciting force is known, the material constants of the plant after its geometry has been determined, i.e. ∆z and ∆G. Apparently, the problem is solvable only in the case of very simple constitutive models. The most important result obtained within the present study is the confirmation of thehypothesis of pronounced polarity of the medium.
This part of the paper presents first, the dynamics of a wheat stem in geometrical approach, and then it is illustrated by appropriate examples. Movement of the bent stems, prior to the cutting, is a very complex translation accompanied by rotations. The above is caused mainly by the asymmetries in the stem structure. Then, the problem of a plane movement is analysed for stems (selected from a layer) since the moment when they have been bent until cutting and throwing them on an auger conveyor. The last part of the paper refers to the analysis of the stem movement in the slot of auger.
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