Abstract
The article lays out the methodology for shaping the design features of a strain gauge transducer, which would make it possible to study forces and torques generated during the operation of symmetrical seeder coulters. The transducers that have been known up until now cannot be used to determine forces and torques for the coulter configuration adopted by the authors. For this purpose, the design of the transducer in the form of strain gauge beams was used to ensure the accumulated stress concentration. A detailed design was presented in the form of a 3D model, along with a transducer body manufactured on its basis, including the method for arranging the strain gauges thereon. Moreover, the article discusses the methodology of processing voltage signals obtained from component loads. Particular attention was paid to the methodology of determining the load capacity of the transducer structure, based on finite element method (FEM). This made it possible to choose a transducer geometry providing the expected measurement sensitivity and, at the same time, maintaining the best linearity of indications, insignificant coupling error, and a broad measurement range. The article also presents the characteristics of the transducer calibration process and a description of a special test stand designed for this purpose. The transducer developed within the scope of this work provides very high precision of load spectrum reads, thus enabling the performance of a detailed fatigue analysis of the tested designs. Additionally, the versatility it offers makes it easy to adapt to many existing test stands, which is a significant advantage because it eliminates the need to build new test stands.
Highlights
Contemporary agricultural machines must ensure high quality of the performed work demonstrated in the performance and precision in the cultivation of soil
Laboratory studies making it possible to better understand and identify the phenomena occurring when they operate in the soil are crucial [1,2,3,4]
The article presents the construction and the method of calibration of a prototype strain gauge transducer for measuring forces acting on the tools of machines operating in the soil
Summary
Contemporary agricultural machines must ensure high quality of the performed work demonstrated in the performance and precision in the cultivation of soil. Depending on the type (i.e., shape, size, fixing method) of the tested element, the structure and dimensions of test stands differ They all enable experiments to be conducted for small tools which make up a larger structure [14,15,16,17,18,19,20]. Such structural diversity of test stands makes it possible to measure characteristic parameters for the given agricultural machine at the selected nodes [21,22,23,24,25]
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