libration

简明释义

英[laɪˈbreɪʃən]美[laɪˈbreɪʃən]

n. 振动（形容词 librational）；[天]天平动

英英释义

单词用法

同义词

反义词

例句

1.Software for low energy trajectory design of libration point missions is developed.

研制了具有自主知识产权的平动点任务节能轨道设计软件。

2.In this dissertation, low energy trajectory design and optimization for collinear libration point missions is studied.

本文对共线平动点任务节能轨道设计与优化进行了研究。

3.First carry on the self libration analysis to the bridge, use spatial four nodes elastic shell element SHELL63 and spatial two nodes elastic beam element BEAM44 to model the bridge.

首先对大桥进行自振特性分析，分别采用空间四节点弹性壳单元SHELL63和空间二节点弹性梁单元BEAM 44单元进行建模。

4.Through optimizing design to fulfill strong steel structure, and to ensure the machine weaving abb with high speed, strong power and small libration.

通过优化设计而实现的高钢性机架构造，保证了织机高速、强劲、低振动的稳定打纬。

5.This paper analyzes some kinds of methods for voltage reference self-ca libration system and explains them one by one.

对几种电压标准自校系统方法进行了分析探讨，并对它们逐个作了研究说明。

6.Orbits of this type can be positioned near collinear libration points, and for simplicity it is adequate to take linear terms into consideration in the control process.

这种类型的轨道可以离共线平动点较近，那么只需要在控制过程中考虑线性项即可，控制条件简单。

7.The libration characteristic of the commercial engine parts is in great importance because of the libration and noise in the idle Speed and working process.

商用车发动机在怠速和工作中会产生较大的振动和噪声，分析其相关零部件的振动特性就显得尤为重要。

8.Libration point orbits have the important applications in deep space exploration, and have been paid more attentions from all over the world.

平动点轨道在深空探测领域具有重要的应用价值，引起了国内外航天界的密切关注。

9.Especially, the author researches the coupling libration of water and dam detailedly.

特别对库水与坝体耦合振动问题进行了详细的阐述。

10.The phenomenon of libration 摆动 allows astronomers to see slightly more than half of the Moon's surface from Earth.

这种摆动现象使天文学家能够从地球上看到月球表面稍多于一半的区域。

11.During a libration 摆动, the Moon appears to rock back and forth in the sky.

在一次摆动中，月球在天空中似乎前后摇摆。

12.The study of libration 摆动 helps scientists understand the gravitational forces acting on the Moon.

对摆动的研究帮助科学家理解作用于月球的引力。

13.In astronomy, libration 摆动 is crucial for mapping the lunar surface accurately.

在天文学中，摆动对于准确绘制月球表面至关重要。

14.The concept of libration 摆动 can also be applied to other celestial bodies that have similar rotational characteristics.

这个摆动的概念也可以应用于其他具有类似旋转特性的天体。

作文

The phenomenon of libration is a fascinating aspect of celestial mechanics that refers to the oscillation of an astronomical body, such as the Moon, around its average position. This oscillation allows observers on Earth to see slightly more than half of the Moon's surface over time, a phenomenon often referred to as the 'librational effect'. Understanding libration is crucial for astronomers and space enthusiasts alike, as it provides insights into the gravitational interactions between celestial bodies and the nature of their orbits. To comprehend libration, one must first recognize that the Moon is not a perfect sphere and does not rotate in a simple manner. The Moon takes approximately 27.3 days to complete one orbit around the Earth, but it also rotates on its axis at the same rate. This synchronous rotation means that one side of the Moon always faces the Earth, leading to the term 'near side' and 'far side' of the Moon. However, due to the slight tilt of the Moon's axis and the elliptical shape of its orbit, observers on Earth can see about 59% of the Moon's surface over time. The concept of libration can be broken down into three main types: longitudinal, latitudinal, and diurnal. Longitudinal libration occurs because of the Moon's elliptical orbit. When the Moon is closer to Earth, it moves faster in its orbit, allowing observers to see a bit further around the edges. Conversely, when it is farther away, it moves slower, revealing less of the far side. Latitudinal libration is caused by the tilt of the Moon's axis, which allows viewers to see slightly over the poles at different times. Finally, diurnal libration results from the rotation of the Earth itself, enabling observers at different locations on Earth to view the Moon from varying angles. The study of libration is not just an academic exercise; it has practical implications as well. For instance, understanding how the Moon librates helps scientists plan lunar missions more effectively. Knowing which parts of the Moon will be visible at any given time can aid in selecting landing sites and planning exploration activities. Additionally, this knowledge can enhance our understanding of the Moon's geology and history, as different regions may have been exposed to various solar and cosmic influences throughout time. In conclusion, libration is a remarkable celestial phenomenon that enriches our understanding of the Moon and its relationship with Earth. By studying libration, we gain valuable insights into the dynamics of our solar system and the intricate dance of celestial bodies. As we continue to explore the cosmos, the principles of libration will undoubtedly play a vital role in our quest for knowledge and discovery in the universe. The beauty of libration lies not only in its scientific significance but also in its ability to inspire wonder and curiosity about the night sky that we gaze upon.

天文学中的“libration”现象是一个引人入胜的方面，它指的是天体（例如月球）围绕其平均位置的振荡。这种振荡使得地球上的观察者能够在一段时间内看到月球表面的略多于一半的部分，这一现象通常被称为“摆动效应”。理解libration对于天文学家和太空爱好者来说至关重要，因为它提供了对天体之间引力相互作用及其轨道性质的深刻见解。 要理解libration，首先必须认识到月球并不是一个完美的球体，也不是以简单的方式旋转。月球绕地球一圈大约需要27.3天，但它也以相同的速度自转。这种同步旋转意味着月球的一侧始终面向地球，导致了“近侧”和“远侧”月球的术语。然而，由于月球轴的轻微倾斜和其轨道的椭圆形状，地球上的观察者可以在一段时间内看到大约59%的月球表面。 libration的概念可以分为三种主要类型：经度摆动、纬度摆动和日间摆动。经度libration是由于月球的椭圆轨道造成的。当月球靠近地球时，它在轨道上移动得更快，使观察者能够看到边缘的更多部分。相反，当它远离时，它移动得较慢，显示出较少的远侧。纬度libration是由于月球轴的倾斜，允许观众在不同时间稍微越过极地。最后，日间libration是由于地球本身的自转，允许地球上不同位置的观察者从不同角度观察月球。 对libration的研究不仅仅是学术练习；它也具有实际意义。例如，理解月球的摆动有助于科学家更有效地规划月球任务。了解在任何给定时间可见的月球部分可以帮助选择着陆点和规划探索活动。此外，这种知识可以增强我们对月球地质和历史的理解，因为不同区域可能在不同时间受到各种太阳和宇宙影响的影响。 总之，libration是一个显著的天文现象，丰富了我们对月球及其与地球关系的理解。通过研究libration，我们获得了对太阳系动力学和天体复杂舞蹈的宝贵见解。随着我们继续探索宇宙，libration的原理无疑将在我们对知识和发现的追求中发挥重要作用。libration的美不仅在于其科学意义，还在于它能够激发我们对夜空的惊奇和好奇心。