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As a carrier of different sensors, moles can penetrate into the regolith automatically and keep investigating the subsurface environment continuously. In this section, features of several moles with different applications are introduced to explain why we choose a hammer-driven mole to study.
Mole driven by a hammer
In this section, the penetrating...
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Citations
... The analysis of the dynamic penetration properties of the penetrator has a significant value to help design the penetrator structure. In this article, based on the results from a previous study on two arc-shaped front noses of penetrator, [15][16][17] the axial resistance of the penetrator with concave arc-shaped nose is smaller than the convex one. Therefore, it is necessary to study the dynamic process of the concave arc-shaped nose of the penetrator. ...
Dynamic penetration test by a penetrator is an important detection method for lunar exploration. The analysis of the dynamic penetration properties of the penetrator significantly helps to design the penetrator structure. In this article, the dynamic penetration mechanical model was established according to soil mechanics. Then, the discrete-element simulation model, which was established using the application program interfaces of the EDEM software, was used to simulate the penetration process. The penetration experiment demonstrated the accuracy of the dynamic penetration model and the discrete-element simulation model. This study of dynamic penetration model of a penetrator may provide technical support to the deep space exploration.
A soft landing directly influences the safety of devices and the follow-on work of a lander. Therefore, research on the interaction between the lander and the lunar regolith is of great significance. Different from the regular test experiments and finite element simulation, the landing impact is studied in a manner that combines a theoretical method and a discrete element simulation based on EDEM, which is more suitable for the simulation of the discrete particles due to the discontinuous properties of lunar regolith. Based on the properties of the lunar regolith and discrete element theory, this paper establishes the theoretical model and the discrete element model of the interaction between the lander and the lunar regolith. The influence of the lander structure and the lunar terrain on this interaction is analyzed through contrastive analysis of different work conditions.
This paper investigates the projective synchronization of fractional-order memristor-based neural networks (FMNNs) with switching jumps mismatch and time-varying delays. According to the theory of discontinuous differential system (Filippov) and differential inclusions, a fractional order inequality was introduced. Based on notoriously Barbalat’s lemma and Razumikhin-type stability theorem, some projective synchronization criteria of FMNNs are derived. These results extend the previous publications. To illustrate the effectiveness of the proposed results, two numerical examples are presented.
