# Optimization of Pile Driver Frame Based on Sensitivity Analysis
## 1 Introduction  
In civil engineering infrastructure, the most common form of foundation is the pile foundation. With the development of the mechanical engineering industry, the quality of pile pressing machinery has also developed for the better. In China's economic construction, pile pressing machinery plays an increasingly critical role. There are various types of pile pressing equipment. The most common ones are as follows: barrel type diesel pile hammer, hydraulic pile hammer, hydraulic static pile hammer, hydraulic vibratory hammer, etc. [1; 2; 3; 4; 5]. Compared with other types of pile presses, hydraulic static pile presses have numerous advantages. First, the hydraulic static pile driver does not greatly affect the surrounding buildings or environment while working, so it does not cause damage to the land structure [6]. Secondly, when working, the top of the pile is not easily damaged and the whole pile body is not subject to bending. During the whole construction process, the noise and the vibrational impact on the ground can be ignored. Since the hydraulic pile driver is hydraulically driven, linear motion is easily achieved and the power utilization rate of the entire device is extremely high [7]. Finally, since the hydraulic apparatus has been kept in a relatively steady state during the operation, it is not difficult to achieve a steless velocity regulation during the motion or over a wide range. As the manufacturing industry has developed, hydraulic components have also become more standardized, it has also become a more versatile part. Hydraulic static pile drivers gradually became used in civil engineering, as they were more convenient for automated operation and protection against overload [8]. The hydrostatic pile driver is a piling machine that uses static pressure to press piles into various substrates, thus realizing the foundation for building implementation, as shown in Figure 1.  
In recent years, with the development of piling technology, hydraulic static pile presses have taken a pivotal role in the construction of pile foundations. However, with the modern demands of green development, energy saving and emission reduction, lightweight vehicles have become a new trend in the development of the manufacturing industry. Product \"weight loss\" has become the top priority for product design and development in this industry. The lightweight design not only enables efficient product quality and material saving development concepts, but also guarantees product performance. It is also beneficial to enhance the company's key competitive advantages and major development policies. In order to occupy a favorable position in the international trend of industrial change, China has proposed the \"Made in China 2025\" strategy in the new international environment. \"Made in China 2025\" is dedicated to breaking the situation of China's manufacturing industry being big but not strong, and vigorously carrying out independent research and development. Domestic scholars are working hard to achieve and catch up with the advanced level of the international machinery industry as soon as possible. The pile driver is an integral part of China's manufacturing [9]. With the improvement of computer technologies, many researchers have gradually mastered some of the advanced software programs such as ANSYS, ABAQUS, MATLAB, and so on. All of these programs can be used for the optimization design of mechanical equipment. The level of mechanical optimization in China has started to improve. By using specific optimization methods, it is possible to optimize multiple objectives with complex linkages at the same time. In this context, the design of pile driving machines is no longer just about achieving the required strength and stiffness of the structure. The aim is also to design mechanical equipment that combines safety and economy. Optimal design methods based on sensitivity analysis have found applications in numerous fields [10] such as automotive, aerospace design, and agricultural machinery. [PERSON] et al.