PSI - Issue 36

A. Babii et al. / Procedia Structural Integrity 36 (2022) 203–210 A. Babii, T. Dovbush, N. Khomuk et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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frame central loading of parabolic type (the frame start and end parts are loaded with equal loading q, and the central part is 2q (parabolic scheme). Let’s substantiate the values of load inte nsity on the distributor frame using the equation (1) for the above mentioned cases of fertilizer distribution. We have taken into consideration the following parameters of loading: the weight of metalwork with assembled mechanisms 35000 = M Q Н; the fertilizer weight taking into account 10% of overloading 100000 = F Q Н. Thus, the total loading on the frame is 135000 0 = + = M F Q Q Q Н. To determine some “extra” unknown internal force factors and support reactions we have used the equa tion (6). Using the modified method of minimum of potential energy of deformation (MMMPED) we have formed the

system of canonic equations. Using APP Wolfram Mathematica 7, we have solved the obtained system. Based on the obtained data we have built the distribution of the internal force factors in the structure, namely lateral forces, bending and torque moments for the three cases under discussion dealing with external loading of the distributor frame. Having analysed the loading diagrams analysis we have come to the conclusion that the most dangerous case relating to the strength index is the parabolic loading scheme (Fig. 7). Based on analysis of fertilizer spreader frame, the crossings in which maximum internal force factors act were determined. Accordingly, in these intersections there occur stresses and for this reason the gauges were installed there. The proposed scheme of location of gauges on the spreader carrier frame is shown in Figure 8. The experimental SSS testing of the organic fertilizers trailer spreader was carried out in operating modes during the technological process: loading of organic fertilizers from the pile, motion of the unit along the field road and directly on the field during fertilizer transportation and spreading, and also returning to the pile in idle mode (Fig. 9). For the reliability of indicators obtained during the experiment, we compare the strain gauge readings with analytical results in static mode. In this case, the strain gauge readings take into account the stressed state caused by technological load. Stress components from the metal structure weight and technological cargo are obtained as accumulative values. 4. Conclusions The results of experimental frame SSS investigations proved that the calculation and experimental data under static load differ up to 7% (Dovbush et al. (2019)). A universal algorithm of additive functions writing of both bending and torque moments and potential energy of deformations as well taking into consideration the unknown values of external support

Fig. 7. Distribution of the internal force factors for the parabolic scheme of distributor frame loading

Fig.8. Schematic diagram of strain gauges and acceleration sensor location on the fertilizer RTR-9 spreader frame.

Fig. 9. Oscillogram of stress change in the organic fertilizers spreader element in crossing # 2: I is the spreader motion without organic fetilizers (t 1 ≈13 min,  1ср = 20MPa); II is loading of organic fertilizers load (t 2 ≈6,5 min,  2ср = 75MPa); III is the spreader motion to the field (t 3 ≈ 3,5 min,  3ср = 118MPa); IV is organic fertilizer spreading (t 4 ≈19 min,  1ср = 85 MPa).

reactions and the internal force factors has been composed. Some analytical research has been conducted including the substantiation of possible cases of external loading distribution along the perimeter of the machine under study