Progress of China's Lunar Exploration (2011-2020)

Li, Chunlai; Liu, Jianjun; Su, Yan

doi:10.11728/cjss2021.01.068

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…The moon is the nearest extraterrestrial body to the earth and an essential springboard to deep space (Li et al, 2021). Since the origin and evolution of the moon can be reconstructed by studying the physics and heat flux of the lunar subsurface, and there are still numerous hidden resources to be exploited, it has once again become a research hotspot in the field of planetary exploration (Liang et al, 2022; Sanin et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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

Xu,

Feng,

Liu

et al. 2024

Journal of Field Robotics

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The low‐velocity penetrator (LVP) is a planetary penetration device that can drive itself to a target depth through its internal periodic impacts. When LVP generates impact energy, it inevitably produces a recoil that can only be counteracted by friction with the soil, if there is no other auxiliary device. Unfortunately, LVP is extraordinarily sensitive to the recoil during the initial stage since the small contact area with the soil results in minor friction between them. Significantly, once the recoil exceeds the friction, LVP cannot work properly and may even retreat, inducing mission failure. In this paper, we develop an optimized LVP with an auxiliary device for lower recoil and higher performance. Specifically, we establish a dynamic model to analyze the single‐cycle motion of LVP and provide essential support for its optimization and design. Meanwhile, an integration method is proposed to calculate the friction between LVP and the soil reasonably and accurately. On the basis of these, we obtain the optimal mass and stiffness parameters of LVP that meet both high penetration efficiency and low recoil. Furthermore, only relying on the parameter optimization is insufficient to eliminate the recoil, and an auxiliary penetration scheme is proposed to provide an external force counteracting the recoil until LVP arrives at a certain depth. Through multiple comparative penetration experiments, we validate the effectiveness of our approaches in promoting penetration ability, stability, and restraining the recoil of LVP. This work provides two novel approaches for solving the contradiction of efficient penetration while reducing the recoil for LVP.

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Section: Introductionmentioning

confidence: 99%

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

Xu,

Feng,

Liu

et al. 2024

Journal of Field Robotics

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The green transformation and development in China under resource constraints

Liu

2023

E3S Web Conf.

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Under energy constraints, green development becomes the main development direction in China now. The green transformation of the economic growth pattern and the green transformation of industry are feasible ways to pursue green development. For the green transformation of the economic growth pattern, various proposals related to environmental protection, resource utilisation, and ecological restoration of mining land are suggested and discussed. For the green transformation of industry, several suggestions are provided for resource-based industries, environmental industries, and other industries. These discussions can contribute to the formulation and development of economic, industrial, and energy policies in China.

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