On lunar exploration missions, the rovers which can move and explore directly are considered by various agency like NASA （National Aeronautics and Space Administration）, JAXA （Japan Aerospace Exploration Agency）, ...On lunar exploration missions, the rovers which can move and explore directly are considered by various agency like NASA （National Aeronautics and Space Administration）, JAXA （Japan Aerospace Exploration Agency）, ESA （European Space Agency）. Lunar rovers are required to move on rough terrains such as craters and rear cliffs where it is scientifically very important to explore. However, there is a problem that the rovers have possibility of stack because of the lunar surface is covered with loose soil named Regolith. Therefore, this paper investigates a mechanism of kinetic behavior between the wheels of the exploration rovers and loose soil. And then, this paper proposed a flexible wheel to solve like that problems. The flexible wheel has the surface which can be changed flexibly toward rough terrain. Running experiments on loose soil which imitated regolith were carried out to observe the traversability of the flexible wheel using slip ratio. Traversality of flexible wheel was better than the circular rigid wheel. The authors believe that stress distribution is important. The stress distribution of the flexible wheels is horizontally long and stress value is small. However, the stress distribution can be changed by loaded more weight. Therefore, the relationship between the stress and the running performance was considered using this differential stress distribution. In experiments, the authors used the flexible wheel with simple structure （3 limbs）. From these considerations, the relationship between the stress of the flexible wheel and the running performance was described.展开更多
New Era research on the essay and other occasional writing already has a history of thirty years. For various reasons, however, such research has consistently been slighted and condemned. This article offers a systema...New Era research on the essay and other occasional writing already has a history of thirty years. For various reasons, however, such research has consistently been slighted and condemned. This article offers a systematic and comprehensive review and analysis of the last thirty years of research in this field in terms of writers and their works, research on special topics, and the construction of the history and theory of this genre, and explores the reasons why it has been slighted for so long. To deepen and broaden this research in the new century, we must exert ourselves in three areas： first, we must adopt a modern vision of criticism of the essay; second, we must ＂digest Western theories＂ and ＂Sinicize essay writing and research＂; and third, we must change our research methods and way of thinking. These three points not only offer an important dimension for understanding and solving contemporary issues relating to the essay, but also have methodological significance for research.展开更多
文摘On lunar exploration missions, the rovers which can move and explore directly are considered by various agency like NASA （National Aeronautics and Space Administration）, JAXA （Japan Aerospace Exploration Agency）, ESA （European Space Agency）. Lunar rovers are required to move on rough terrains such as craters and rear cliffs where it is scientifically very important to explore. However, there is a problem that the rovers have possibility of stack because of the lunar surface is covered with loose soil named Regolith. Therefore, this paper investigates a mechanism of kinetic behavior between the wheels of the exploration rovers and loose soil. And then, this paper proposed a flexible wheel to solve like that problems. The flexible wheel has the surface which can be changed flexibly toward rough terrain. Running experiments on loose soil which imitated regolith were carried out to observe the traversability of the flexible wheel using slip ratio. Traversality of flexible wheel was better than the circular rigid wheel. The authors believe that stress distribution is important. The stress distribution of the flexible wheels is horizontally long and stress value is small. However, the stress distribution can be changed by loaded more weight. Therefore, the relationship between the stress and the running performance was considered using this differential stress distribution. In experiments, the authors used the flexible wheel with simple structure （3 limbs）. From these considerations, the relationship between the stress of the flexible wheel and the running performance was described.
文摘New Era research on the essay and other occasional writing already has a history of thirty years. For various reasons, however, such research has consistently been slighted and condemned. This article offers a systematic and comprehensive review and analysis of the last thirty years of research in this field in terms of writers and their works, research on special topics, and the construction of the history and theory of this genre, and explores the reasons why it has been slighted for so long. To deepen and broaden this research in the new century, we must exert ourselves in three areas： first, we must adopt a modern vision of criticism of the essay; second, we must ＂digest Western theories＂ and ＂Sinicize essay writing and research＂; and third, we must change our research methods and way of thinking. These three points not only offer an important dimension for understanding and solving contemporary issues relating to the essay, but also have methodological significance for research.
