# Optimization of Design Parameters Using SQP for an Agricultural Pipe Extraction Device
## 1 Introduction
Through this, the opening time was reduced by 2.7 ms, which showed an improvement effect of 22.5%. Although many studies have been conducted on link structures, to the best of our knowledge, there have been no studies on the design of hand tools for agriculture. Due to the aging of agricultural workers, the development of agricultural machinery should promote comfort and convenience. However, studies to improve the convenience of using agricultural machinery in consideration of the body of the elderly are lacking. Moreover, there is no research on hand tools such as the pipe extraction device selected as the subject of study in this study. Minimizing the force required to operate agricultural machinery is important because it can prevent user injury and increase comfort. In this study, sequential quadratic programming (SQP) was used as an optimization algorithm. SQP is an algorithm that quickly and accurately converges the objective function and is widely used as an objective function optimization algorithm for various optimal designs. [PERSON] et al. (2018) [7] conducted a study on the optimization of the cross-sectional design of the main wing of a human-powered aircraft. Variational asymptotic beam section analysis (VABS) and geometric precision beam theory were introduced for optimization. The objective function obtained through this process was optimized through the SQP algorithm, and a mass reduction of 7.88% was obtained while maintaining the bending and torsional deformation. [PERSON] (1998) [8] used the SQP algorithm for the optimization of structures under multiple loading conditions. It was confirmed that the formula is simple and easy to converge to the optimal solution when the SQP algorithm is used for optimization. As a result, although the state variables become an implicit function of the sizing variables, the dimension of the optimization problem can be greatly reduced. In addition, [PERSON] et al. (2022) [9] conducted a study to optimize the efficiency of a 3 K-type planetary reducer using the SQP technique and confirmed that the highest efficiency gear parameters could be obtained under constraints. As such, the SQP algorithm is judged to be suitable for optimizing mechanical systems. There are not many cases in which an algorithm such as SQP is used in the process of optimizing design variables, such as the link length of agricultural equipment. For agricultural hand tools such as the pipe extraction device, which is the subject of this study, no research has been conducted on machine improvement through link length optimization. If hand tools can be improved through the process of setting the objective function, design, and operating conditions, it is expected that the agricultural environment can be dramatically improved. Therefore, in this study, each design variable was optimized to minimize the objective function value using the SQP algorithm. In setting the objective function, we tried to obtain design parameters so that the user could conveniently operate the instrument with little force and without the risk of injury.