Simulation model of rotary tillage for designing rotary blade - Deformation and stress analysis of rotary blade

摘要

The performances of the rotary tillage is characterized by the power requirement of the rotary tiller and the final condition of the tilled soil in terms of the degree of soil pulverization, the clod size distribution and soil moisture within the tilled soil layer (the uniformity of mixing). The key factor affecting the performance of the rotary tiller is the blade configuration. The blade of the rotary tiller has been designed depending on the engineers' experience and intuition. This means that a lot of time and money has been consumed with minor significant output. A simulation model to facilitate the evaluation of the rotary tillage performance would be more effective to design and develop the rotary blade and the tiller. The objective of this study is to construct and develop a simulation model to evaluate the performance of the rotary tillage. This paper analyzed the deformation and stress of the rotary blade under different force conditions using 3-D CAD software. The deformation of the blade during the soil cutting is an important index related to the direction of the cut soil throw. Furthermore, knowing the blade status during the soil cutting process is helpful for developing the simulation model of the rotary tillage. The configuration of the tested blade measured using a laser distance sensor, and the 3-D drawing was produced by the 3-D CAD software (Solid Works). The stress and deformation of the blade were analyzed by 3-D statistical analysis software (COSMOS Works), under the different magnitude of forces and their directions relative to the blade. The magnitude of the force applied to the blade was estimated from the maximum torque of the rotary shaft. As a result of the analysis, the blade has a maximum deformation of about 3.8mm at the tip. The relationship between the deformation of the blade during soil cutting and the tilled soil throwing will be examined in the future.