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Self-propelled automatic chassis of Lunokhod-1: History of creation in episodes

Mikhail MALENKOV

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1, Pages 60-86 doi: 10.1007/s11465-016-0370-5

Abstract: The review considers the issues in designing moon rovers, their essential features, and the particular

Keywords： moon rover self-propelled chassis propulsion wheel suspension soil properties cross-country ability

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Design of a novel side-mounted leg mechanism with high flexibility for a multi-mission quadruped earth rover

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0740-0

Abstract: Earth rover is a class of emerging wheeled-leg robots for nature exploration.design process of a novel 5-degree-of-freedom (5-DOF) hybrid leg mechanism for our quadruped earth roverFurthermore, the virtual quadruped rover equipped with this innovative leg mechanism is built.Various basic and specific LTs of the rover are demonstrated by simulation, which indicates that theflexibility of the legs can help the rover achieve multitasking.

Keywords： design synthesis parallel mechanism hybrid leg mechanism screw theory quadruped robot

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Some Thoughts on the Launch Vehicle Selection for China's Moon Exploration Program

Long Lehao

Strategic Study of CAE 2002, Volume 4, Issue 9, Pages 31-37

Abstract: Moon exploration is the first step to achieve the goal of “Conducting Deep Space Exploration”.To put the moon probe (or satellite) into orbit, it is especially important to select the right typeStarting from the basic requirements of the launch vehicle(s) for the moon exploration mission, experienceof moon-faring nations and current status of Long March launch vehicles, the author analyses pros andcons of the three operational orbits for moon exploration and feasibility of the program, and identifies

Keywords： moon exploration program launch vehicle type selection analysis

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China's Latest Moon Mission Returns New Lunar Rocks

Mitch Leslie

Engineering 2021, Volume 7, Issue 5, Pages 544-546 doi: 10.1016/j.eng.2021.03.007

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Commercial Moon Landings Multiply

Mitch Leslie

Engineering 2023, Volume 30, Issue 11, Pages 10-12 doi: 10.1016/j.eng.2023.09.003

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Experimental study and field application of calcium sulfoaluminate cement for rapid repair of concrete pavements

Yanhua GUAN, Ying GAO, Renjuan SUN, Moon C. WON, Zhi GE

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 3, Pages 338-345 doi: 10.1007/s11709-017-0411-0

Abstract: The fast-track repair of deteriorated concrete pavement requires materials that can be placed, cured, and opened to the traffic in a short period. Type III cement and Calcium Sulfoaluminate (CSA) cement are the most commonly used fast-setting hydraulic cement (FSHC). In this study, the properties of Type III and CSA cement concrete, including compressive strength, coefficient of thermal expansion (CTE) and shrinkage were evaluated. The test results indicate that compressive strength of FSHC concrete increased rapidly at the early age. CSA cement concrete had higher early-age and long term strength. The shrinkage of CSA cement concrete was lower than that of Type III cement concrete. Both CSA and Type III cement concrete had similar CTE values. Based on the laboratory results, the CSA cement was selected as the partial-depth rapid repair material for a distressed continuously reinforced concrete pavement. The data collected during and after the repair show that the CSA cement concrete had good short-term and long-term performances and, therefore, was suitable for the rapid repair of concrete pavement.

Keywords： Calcium Sulfoaluminate (CSA) cement Type III cement coefficient of thermal expansion (CTE) shrinkage rapid repair

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Electrical Resistivity Modification of Electrodeposited Mo and Mo–Co Nanowires for Interconnect Applications Article

Jun Hwan Moon, Taesoon Kim, Youngmin Lee, Seunghyun Kim, Yanghee Kim, Jae-Pyoung Ahn, Jungwoo Choi, Hyuck

Engineering 2024, Volume 32, Issue 1, Pages 128-138 doi: 10.1016/j.eng.2023.07.017

Abstract:

Achieving historically anticipated improvement in the performance of integrated circuits is challenging, due to the increasing cost and complexity of the required technologies with each new generation. To overcome this limitation, the exploration and development of novel interconnect materials and processes are highly desirable in the microelectronics field. Molybdenum (Mo) is attracting attention as an advanced interconnect material due to its small resistivity size effect and high cohesive energy; however, effective processing methods for such materials have not been widely investigated. Here, we investigate the electrochemical behavior of ions in the confined nanopores that affect the electrical properties and microstructures of nanoscale Mo and Mo–Co alloys prepared via template-assisted electrodeposition. Additives in an electrolyte allow the deposition of extremely pure metal materials, due to their interaction with metal ions and nanopores. In this study, boric acid and tetrabutylammonium bisulfate (TBA) were added to an acetate bath to inhibit the hydrogen evolution reaction. TBA accelerated the reduction of Mo at the surface by inducing surface conduction on the nanopores. Metallic Mo nanowires with a 130 nm diameter synthesized through high-aspect-ratio nanopore engineering exhibited a resistivity of (63.0 ± 17.9) μΩ·cm. We also evaluated the resistivities of Mo–Co alloy nanowires at various compositions toward replacing irreducible conventional barrier/liner layers. An intermetallic compound formed at an Mo composition of 28.6 at%, the resistivity of the Mo–Co nanowire was (58.0 ± 10.6) μΩ·cm, indicating its superior electrical and adhesive properties in comparison with those of conventional barriers such as TaN and TiN. Furthermore, density functional theory and non-equilibrium Green’s function calculations confirmed that the vertical resistance of the via structure constructed from Mo-based materials was 21% lower than that of a conventional Cu/Ta/TaN structure.

Keywords： Molybdenum Molybdenum–cobalt Interconnect Microstructure Electrodeposition Density functional theory

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Mechanical Analysis and Performance Optimization for the Lunar Rover’s Vane-Telescopic Walking Wheel Article

Lu Yang, Bowen Cai, Ronghui Zhang, Kening Li, Zixian Zhang, Jiehao Lei, Baichao Chen, Rongben Wang

Engineering 2020, Volume 6, Issue 8, Pages 936-943 doi: 10.1016/j.eng.2020.07.009

Abstract: However, this is a difficult task due to the complex terrain of the moon and limited resources onboardthis study, an experimental prototype was set up to analyze the existing mechanical design of a lunar roverFirst, a new vane-telescopic walking wheel was proposed for the lunar rover with a positive and negativequadrangle suspension, considering the complex terrain of the moon.wheel can protrude on demand and reduce energy consumption; it can be used as a reference for lunar rover

Keywords： Intelligent vehicle Vane-telescopic walking wheel Performance optimization Vane spring Lunar rover