Earth and Space 2021最新文献

Granular Flow Modeling of Robot-Terrain Interactions in Reduced Gravity 失重条件下机器人-地形相互作用的颗粒流模型

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483374.006

A. Haeri, K. Skonieczny

引用次数: 4

Extraterrestrial Construction in Lunar and Martian Environments 月球和火星环境中的外星建筑

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483374.111

M. Z. Naser, Qiushi Chen

{"title":"Extraterrestrial Construction in Lunar and Martian Environments","authors":"M. Z. Naser, Qiushi Chen","doi":"10.1061/9780784483374.111","DOIUrl":"https://doi.org/10.1061/9780784483374.111","url":null,"abstract":"Space exploration and terraforming nearby planets have been fascinating concepts for the longest time. Nowadays, that technological advancements in manufacturing, robotics and propellants are thriving, it is only a matter of time before humans can start colonizing nearby moons and planets. In recognition of the 50 th anniversary of the first manned lunar landing, the National Aeronautics and Space Administration (NASA), together with the European Space Agency (ESA), revealed plans to establish a permanent human presence (habitats) on the Moon and Mars by 2040. In order to facilitate feasible and sustainable space exploration, such habitats are envisioned to be primarily built from lunar and Martian in-situ resources. To date, our understanding of indigenous resources continues to be lacking and in order to bridge this knowledge gap, this paper explores the suitability of construction materials derived from lunar and Martian regolith, along with terrestrial derivatives, for interplanetary construction. This paper also identifies key processing techniques suitable to produce extraterrestrial construction materials under alien environments (i.e., vacuum, low gravity, etc.) and showcases prominent design concepts for “space - resilient” habitats and colonies.","PeriodicalId":345627,"journal":{"name":"Earth and Space 2021","volume":"284 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131995594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Lunar Rover Optimization Platform for Wheel Traction Studies 月球车车轮牵引研究优化平台

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483374.038

Stephen Gerdts, J. Breckenridge, Kyle Johnson

引用次数: 0

The Damage to Lunar Orbiting Spacecraft Caused by the Ejecta of Lunar Landers 月球着陆器抛射物对月球轨道航天器的损伤

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483374.014

P. Metzger, J. Mantovani

引用次数: 3

Rebar Local Corrosion Monitoring of RC Structures Based on Fractal Characteristics of Piezoelectric Guided Waves 基于压电导波分形特征的钢筋混凝土结构局部腐蚀监测

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483381.051

Shi Yan, Xuenan Wang, Yaoyao Chen, Yuanyuan Yao

{"title":"Rebar Local Corrosion Monitoring of RC Structures Based on Fractal Characteristics of Piezoelectric Guided Waves","authors":"Shi Yan, Xuenan Wang, Yaoyao Chen, Yuanyuan Yao","doi":"10.1061/9780784483381.051","DOIUrl":"https://doi.org/10.1061/9780784483381.051","url":null,"abstract":"In offshore reinforced concrete (RC) structures, how to monitor early occurrences and developments of rebar corrosion is of great significance. However, the rebar corrosion in RC structures is localized and developed along interfaces, having great challenges to evaluations of rebar corrosion levels. In this paper, the theoretical analysis, numerical calculation, and experiment validation are used to study the rebar local corrosion monitoring and evaluation of RC structures with piezoelectric ultrasonic guided waves (UGWs). A reasonable selection of the UGW excitation and reception method and corresponding experimental setup are studied. Frequency dispersion curves of the selected UGWs under different corrosion conditions are obtained by analyzing the wave dispersion and multimodal characteristics. Based on energy values and fractal dimension characteristic values of echo signals for different corrosion levels, a rebar corrosion evaluation index is proposed, and a corresponding evaluation algorithm is established. The effectiveness of the proposed algorithm is verified by a rebar corrosion monitoring test based on the accelerated corrosion and guided wave technologies. A fitting relationship between corrosion levels (length and thickness) and basic characteristics of sensing signals is established. A corrosion evaluation method is established based on the corrosion index and algorithm. The results show that rebar corrosions have a sensitive effect on the energy and fractal characteristics of longitudinal UGWs. The larger corrosion length and the thicker corrosion layer result in the smaller energy value of echo signal and the smaller fractal characteristic value, and the larger corrosion index value.","PeriodicalId":345627,"journal":{"name":"Earth and Space 2021","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131271870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lunar Mega Project: Processes, Work Flow, and Terminology of the Terrestrial Construction Industry versus the Space Industry 月球大型工程:过程、工作流程和地面建筑行业与太空行业的术语

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483374.109

R. Mueller, R. W. Moses, David Wilson, P. Carrato, Troy King

引用次数: 2

Crash Sled Testing of Triaxially Braided CFRP for Improved Vehicular Crashworthiness 提高汽车耐撞性的三轴编织碳纤维布碰撞台车试验

Earth and Space 2021 Pub Date : 2021-04-15 DOI: 10.1061/9780784483381.020

C. Ruggeri, R. Haluza, J. M. Pereira, S. Miller, C. Bakis, K. Koudela

引用次数: 2

Interlocking Spikes for Extreme Mobility 连锁尖峰极端机动性

Earth and Space 2021 Pub Date : 2020-03-31 DOI: 10.31224/osf.io/h3t7r

Volker Nannen, D. Bover

{"title":"Interlocking Spikes for Extreme Mobility","authors":"Volker Nannen, D. Bover","doi":"10.31224/osf.io/h3t7r","DOIUrl":"https://doi.org/10.31224/osf.io/h3t7r","url":null,"abstract":"The interlock drive system generates traction by penetrating articulated spikes into the ground and by using the natural strength of the ground for traction. A fundamental problem of traction by interlocking spikes is how to penetrate the ground such that the spike will withstand the draft force. The theory of critical depth suggests that a high rake angle reduces soil fragmentation, while vehicle stability and demand for a high pull/weight ratio require a low thrust angle. To satisfy both requirements, we connect an interlocking spike with a high rake angle via a lever arm to a hinge close to the ground for a low thrust angle. The resulting friction of the spike with the soil increases the vertical penetration force during penetration. Experimental data shows that such a spike penetrates soil of a much higher penetration resistance than predicted from an analysis of the forces involved, possibly because the spike follows the path of least resistance. To better understand and improve the potential of interlocking spikes for mobility in extreme terrain, we need a comprehensive experimental analysis. Accepted Paper in Proc. Earth & Space 2020: 17th Biennial ASCE International Conference on Engineering, Science, Construction and Operations in Challenging Environments, ASCE, Seattle WA.","PeriodicalId":345627,"journal":{"name":"Earth and Space 2021","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127241646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

This paper’s contents have been removed 这篇论文的内容已被删除

Earth and Space 2021 Pub Date : 2019-07-02 DOI: 10.1061/9780784483374.059

引用次数: 0