The structural model of the load-bearing structure of an agricultural machine used to simulate the calibration of the measuring system.

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... and gives information for the optimal choice of the locations of the strain gauge sensors on the bar. B. Calibration model for the load-bearing structure of an agricultural machine A calibration model inspired by experimental works for measuring the draft soil tillage force for an agricultural machine, [27], is presented in this subchapter. In Fig. 3 is showed the structural model of the load-bearing structure of the machine, created with 1D finite elements (Timoshenko bars). For this article, the dimensions and profiles of the bars used or the physical characteristics of the material will not be given, because the article does not make a structural analysis of this load-bearing ...

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... of all degrees of freedom at the normal end embedded in the tractor body). On the three tie rods there is a strain gauge sensor oriented along those bars, close to the ends from the load-bearing structure (in the centre of the penultimate finite elements from the load-bearing structure). The forces acting on the structure are applied as seen in Fig. 3, their intensities being given in Fig. 4. In the physical model, the forces in Fig. 4 are applied by hydraulic cylinders on the Ox direction (Fig.3), and the axial stress (Fig. 4) is obtained from the indications of the three deformation sensors, through usual transformations in the techniques of strain gauge measuring systems. On the ...

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... the three tie rods there is a strain gauge sensor oriented along those bars, close to the ends from the load-bearing structure (in the centre of the penultimate finite elements from the load-bearing structure). The forces acting on the structure are applied as seen in Fig. 3, their intensities being given in Fig. 4. In the physical model, the forces in Fig. 4 are applied by hydraulic cylinders on the Ox direction (Fig.3), and the axial stress (Fig. 4) is obtained from the indications of the three deformation sensors, through usual transformations in the techniques of strain gauge measuring systems. ...

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... cylinders on the Ox direction (Fig.3), and the axial stress (Fig. 4) is obtained from the indications of the three deformation sensors, through usual transformations in the techniques of strain gauge measuring systems. On the model used for simulation, the forces are applied in nodes in the area of the working body or other types of load (Fig. 3), and the axial stresses are read on the three finite elements on the tie rods specified above and in Fig. 3. Using the least squares method, [9], we look for linear combinations for the calculation of the applied forces, depending on the indications of the strain gauge ...

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... of the three deformation sensors, through usual transformations in the techniques of strain gauge measuring systems. On the model used for simulation, the forces are applied in nodes in the area of the working body or other types of load (Fig. 3), and the axial stresses are read on the three finite elements on the tie rods specified above and in Fig. 3. Using the least squares method, [9], we look for linear combinations for the calculation of the applied forces, depending on the indications of the strain gauge ...