A multi-criteria design optimization method for the cutter shaft size of a rotary tiller

Abstract

The invention relates to a rotary cultivator cutter shaft size multi-criterion design optimization method. According to the rotary cultivator cutter shaft size design, a bearing stress criterion function and a cost criterion function must be taken into consideration simultaneously; when the rotary cultivator cutter shaft size design is established, various restrictive conditions must be met, the minimum value corresponding to each criterion function is solved separately at first, then a multi-target ideal point non-linear planning problem is defined and a rotary cultivator cutter shaft optimal size parameter is finally calculated by a numerical optimization algorithm. The most important characteristic of the method is that the bearing stress criterion and the cost criterion of the rotary cultivator cutter shaft serve as considered targets, the two targets are correlated with a multi-target ideal point method, and the operation is simple and easy to understand; furthermore, the obtained result can meet the requirement of safe operation of the rotary cultivator cutter shaft and also can guarantee the economic property of the rotary cultivator cutter shaft to a great degree.

Description

technical field [0001] The invention relates to a multi-criteria design optimization method for the cutter shaft size of a rotary tiller. Background technique [0002] With the increase of rice planting area in my country and the rapid development of facility greenhouse technology, rotary tillers are playing an increasingly important role in it. During the tillage process of the rotary tiller, the knife bearing is subjected to the reaction force of the soil and the driving torque of the engine, which will produce complex combined deformations such as bending, torsion or shear, and accompanied by intense vibration and impact, the volume of the rotary tiller shaft The size also affects the manufacturing cost and economical use of the rotary tiller. In order to ensure that the rotary tiller shaft meets the requirements of load strength and low-cost manufacturing, a key technology is to optimize the size parameters of the rotary tiller shaft. After searching the existing liter...

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Problems solved by technology

[0003] In order to overcome the disadvantages of the existing rotary tiller cutter shaft size design method, which are conservative in results, complicated in operation, and unable to effectively take into account the strength of the cutter shaft and the economic cost criterion of manufacturing, the present invention provides a simple design, easy to operate, and can achieve Design optimization method for rotary tiller cutter shaft size with the lowest manufacturing economy and cost under the premise of using strength

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