Dynamics Research and Parameter Optimization of Planetary Penetrators

Abstract

Impact-type penetrators are devices that apply the impact generated by their internal components to penetrate the soil. The penetration effect of the impact-type penetrators is affected by the physical parameters (e.g., mass and stiffness) of their internal constituent elements. Therefore, optimal parameters must be obtained by using a dynamic impact penetrator model to maximize the dive distance of each impact. However, the dynamic impact penetrator models are nonlinear and difficult to describe. Thus, in this paper, this work proposes a segmentation method for modeling the penetrator motion to establish an accurate dynamic model that can be divided into four states. Buffer spring pre-compression, which is introduced as a new influencing parameter to improve the performance of the penetrator, and the genetic algorithm is used for the optimization in accordance with the characteristics of the required optimization parameter set. Parameter stability is then analyzed by considering the actual project application. Then, the control variable method is employed to explore the influence of changing the obtained parameters on the penetration effect. Finally, a processing prototype designed on the basis of the acquired parameters is used for the experimental verification. This work addresses the complexity of the dynamics model of penetration and the difficulty encountered in determining the parameter values.

Two novel approaches for solving the contradiction between efficient penetration and low recoil for the low‐velocity penetrator

“…On the basis of previous research experience (Wang et al, 2019) and the mass requirements (the mass is limited since the requirement of launch), we define the range of each parameter in Table 4. Where k_ step is the step size of K 0 and K 1 , m_ step 1 is the step size of M 1 and M 2 , and m_ step 2 is the step size of M 0 .…”

“…Specifically, we establish the multibody dynamic simulation model and compare the results obtained by the simulation and theory. Besides, we compare S 2max and F b max between the original (Wang et al, 2019) and the optimal parameters.…”

“…The low-velocity penetrator (LVP) is a mole-like device for planetary drilling and consists mainly of a hammer, a driving device, a casing, a force spring, and a buffer spring (Wang et al, 2019), as shown in Figure 1. For simplicity, the working process of LVP can be regarded as hammering a nail continuously, where the nail is the casing in LVP.…”

Review on research and development of planetary penetrator

“…In view of this, Mangkuan Wang proposed a segmentation method to model the movement of the penetrator. It can establish an accurate dynamic model and then introduce the genetic algorithm to optimize, and analyze the parameters through the control variable method, to obtain more accurate parameters (Wang et al, 2019).…”